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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
commitace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch)
treeb2d64bc10158fdd5497876388cd68142ca374ed3 /fs/xfs/libxfs/xfs_bmap.c
parentInitial commit. (diff)
downloadlinux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz
linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'fs/xfs/libxfs/xfs_bmap.c')
-rw-r--r--fs/xfs/libxfs/xfs_bmap.c6240
1 files changed, 6240 insertions, 0 deletions
diff --git a/fs/xfs/libxfs/xfs_bmap.c b/fs/xfs/libxfs/xfs_bmap.c
new file mode 100644
index 0000000000..30c931b388
--- /dev/null
+++ b/fs/xfs/libxfs/xfs_bmap.c
@@ -0,0 +1,6240 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2000-2006 Silicon Graphics, Inc.
+ * All Rights Reserved.
+ */
+#include "xfs.h"
+#include "xfs_fs.h"
+#include "xfs_shared.h"
+#include "xfs_format.h"
+#include "xfs_log_format.h"
+#include "xfs_trans_resv.h"
+#include "xfs_bit.h"
+#include "xfs_sb.h"
+#include "xfs_mount.h"
+#include "xfs_defer.h"
+#include "xfs_dir2.h"
+#include "xfs_inode.h"
+#include "xfs_btree.h"
+#include "xfs_trans.h"
+#include "xfs_alloc.h"
+#include "xfs_bmap.h"
+#include "xfs_bmap_util.h"
+#include "xfs_bmap_btree.h"
+#include "xfs_rtalloc.h"
+#include "xfs_errortag.h"
+#include "xfs_error.h"
+#include "xfs_quota.h"
+#include "xfs_trans_space.h"
+#include "xfs_buf_item.h"
+#include "xfs_trace.h"
+#include "xfs_attr_leaf.h"
+#include "xfs_filestream.h"
+#include "xfs_rmap.h"
+#include "xfs_ag.h"
+#include "xfs_ag_resv.h"
+#include "xfs_refcount.h"
+#include "xfs_icache.h"
+#include "xfs_iomap.h"
+
+struct kmem_cache *xfs_bmap_intent_cache;
+
+/*
+ * Miscellaneous helper functions
+ */
+
+/*
+ * Compute and fill in the value of the maximum depth of a bmap btree
+ * in this filesystem. Done once, during mount.
+ */
+void
+xfs_bmap_compute_maxlevels(
+ xfs_mount_t *mp, /* file system mount structure */
+ int whichfork) /* data or attr fork */
+{
+ uint64_t maxblocks; /* max blocks at this level */
+ xfs_extnum_t maxleafents; /* max leaf entries possible */
+ int level; /* btree level */
+ int maxrootrecs; /* max records in root block */
+ int minleafrecs; /* min records in leaf block */
+ int minnoderecs; /* min records in node block */
+ int sz; /* root block size */
+
+ /*
+ * The maximum number of extents in a fork, hence the maximum number of
+ * leaf entries, is controlled by the size of the on-disk extent count.
+ *
+ * Note that we can no longer assume that if we are in ATTR1 that the
+ * fork offset of all the inodes will be
+ * (xfs_default_attroffset(ip) >> 3) because we could have mounted with
+ * ATTR2 and then mounted back with ATTR1, keeping the i_forkoff's fixed
+ * but probably at various positions. Therefore, for both ATTR1 and
+ * ATTR2 we have to assume the worst case scenario of a minimum size
+ * available.
+ */
+ maxleafents = xfs_iext_max_nextents(xfs_has_large_extent_counts(mp),
+ whichfork);
+ if (whichfork == XFS_DATA_FORK)
+ sz = XFS_BMDR_SPACE_CALC(MINDBTPTRS);
+ else
+ sz = XFS_BMDR_SPACE_CALC(MINABTPTRS);
+
+ maxrootrecs = xfs_bmdr_maxrecs(sz, 0);
+ minleafrecs = mp->m_bmap_dmnr[0];
+ minnoderecs = mp->m_bmap_dmnr[1];
+ maxblocks = howmany_64(maxleafents, minleafrecs);
+ for (level = 1; maxblocks > 1; level++) {
+ if (maxblocks <= maxrootrecs)
+ maxblocks = 1;
+ else
+ maxblocks = howmany_64(maxblocks, minnoderecs);
+ }
+ mp->m_bm_maxlevels[whichfork] = level;
+ ASSERT(mp->m_bm_maxlevels[whichfork] <= xfs_bmbt_maxlevels_ondisk());
+}
+
+unsigned int
+xfs_bmap_compute_attr_offset(
+ struct xfs_mount *mp)
+{
+ if (mp->m_sb.sb_inodesize == 256)
+ return XFS_LITINO(mp) - XFS_BMDR_SPACE_CALC(MINABTPTRS);
+ return XFS_BMDR_SPACE_CALC(6 * MINABTPTRS);
+}
+
+STATIC int /* error */
+xfs_bmbt_lookup_eq(
+ struct xfs_btree_cur *cur,
+ struct xfs_bmbt_irec *irec,
+ int *stat) /* success/failure */
+{
+ cur->bc_rec.b = *irec;
+ return xfs_btree_lookup(cur, XFS_LOOKUP_EQ, stat);
+}
+
+STATIC int /* error */
+xfs_bmbt_lookup_first(
+ struct xfs_btree_cur *cur,
+ int *stat) /* success/failure */
+{
+ cur->bc_rec.b.br_startoff = 0;
+ cur->bc_rec.b.br_startblock = 0;
+ cur->bc_rec.b.br_blockcount = 0;
+ return xfs_btree_lookup(cur, XFS_LOOKUP_GE, stat);
+}
+
+/*
+ * Check if the inode needs to be converted to btree format.
+ */
+static inline bool xfs_bmap_needs_btree(struct xfs_inode *ip, int whichfork)
+{
+ struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork);
+
+ return whichfork != XFS_COW_FORK &&
+ ifp->if_format == XFS_DINODE_FMT_EXTENTS &&
+ ifp->if_nextents > XFS_IFORK_MAXEXT(ip, whichfork);
+}
+
+/*
+ * Check if the inode should be converted to extent format.
+ */
+static inline bool xfs_bmap_wants_extents(struct xfs_inode *ip, int whichfork)
+{
+ struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork);
+
+ return whichfork != XFS_COW_FORK &&
+ ifp->if_format == XFS_DINODE_FMT_BTREE &&
+ ifp->if_nextents <= XFS_IFORK_MAXEXT(ip, whichfork);
+}
+
+/*
+ * Update the record referred to by cur to the value given by irec
+ * This either works (return 0) or gets an EFSCORRUPTED error.
+ */
+STATIC int
+xfs_bmbt_update(
+ struct xfs_btree_cur *cur,
+ struct xfs_bmbt_irec *irec)
+{
+ union xfs_btree_rec rec;
+
+ xfs_bmbt_disk_set_all(&rec.bmbt, irec);
+ return xfs_btree_update(cur, &rec);
+}
+
+/*
+ * Compute the worst-case number of indirect blocks that will be used
+ * for ip's delayed extent of length "len".
+ */
+STATIC xfs_filblks_t
+xfs_bmap_worst_indlen(
+ xfs_inode_t *ip, /* incore inode pointer */
+ xfs_filblks_t len) /* delayed extent length */
+{
+ int level; /* btree level number */
+ int maxrecs; /* maximum record count at this level */
+ xfs_mount_t *mp; /* mount structure */
+ xfs_filblks_t rval; /* return value */
+
+ mp = ip->i_mount;
+ maxrecs = mp->m_bmap_dmxr[0];
+ for (level = 0, rval = 0;
+ level < XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK);
+ level++) {
+ len += maxrecs - 1;
+ do_div(len, maxrecs);
+ rval += len;
+ if (len == 1)
+ return rval + XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK) -
+ level - 1;
+ if (level == 0)
+ maxrecs = mp->m_bmap_dmxr[1];
+ }
+ return rval;
+}
+
+/*
+ * Calculate the default attribute fork offset for newly created inodes.
+ */
+uint
+xfs_default_attroffset(
+ struct xfs_inode *ip)
+{
+ if (ip->i_df.if_format == XFS_DINODE_FMT_DEV)
+ return roundup(sizeof(xfs_dev_t), 8);
+ return M_IGEO(ip->i_mount)->attr_fork_offset;
+}
+
+/*
+ * Helper routine to reset inode i_forkoff field when switching attribute fork
+ * from local to extent format - we reset it where possible to make space
+ * available for inline data fork extents.
+ */
+STATIC void
+xfs_bmap_forkoff_reset(
+ xfs_inode_t *ip,
+ int whichfork)
+{
+ if (whichfork == XFS_ATTR_FORK &&
+ ip->i_df.if_format != XFS_DINODE_FMT_DEV &&
+ ip->i_df.if_format != XFS_DINODE_FMT_BTREE) {
+ uint dfl_forkoff = xfs_default_attroffset(ip) >> 3;
+
+ if (dfl_forkoff > ip->i_forkoff)
+ ip->i_forkoff = dfl_forkoff;
+ }
+}
+
+#ifdef DEBUG
+STATIC struct xfs_buf *
+xfs_bmap_get_bp(
+ struct xfs_btree_cur *cur,
+ xfs_fsblock_t bno)
+{
+ struct xfs_log_item *lip;
+ int i;
+
+ if (!cur)
+ return NULL;
+
+ for (i = 0; i < cur->bc_maxlevels; i++) {
+ if (!cur->bc_levels[i].bp)
+ break;
+ if (xfs_buf_daddr(cur->bc_levels[i].bp) == bno)
+ return cur->bc_levels[i].bp;
+ }
+
+ /* Chase down all the log items to see if the bp is there */
+ list_for_each_entry(lip, &cur->bc_tp->t_items, li_trans) {
+ struct xfs_buf_log_item *bip = (struct xfs_buf_log_item *)lip;
+
+ if (bip->bli_item.li_type == XFS_LI_BUF &&
+ xfs_buf_daddr(bip->bli_buf) == bno)
+ return bip->bli_buf;
+ }
+
+ return NULL;
+}
+
+STATIC void
+xfs_check_block(
+ struct xfs_btree_block *block,
+ xfs_mount_t *mp,
+ int root,
+ short sz)
+{
+ int i, j, dmxr;
+ __be64 *pp, *thispa; /* pointer to block address */
+ xfs_bmbt_key_t *prevp, *keyp;
+
+ ASSERT(be16_to_cpu(block->bb_level) > 0);
+
+ prevp = NULL;
+ for( i = 1; i <= xfs_btree_get_numrecs(block); i++) {
+ dmxr = mp->m_bmap_dmxr[0];
+ keyp = XFS_BMBT_KEY_ADDR(mp, block, i);
+
+ if (prevp) {
+ ASSERT(be64_to_cpu(prevp->br_startoff) <
+ be64_to_cpu(keyp->br_startoff));
+ }
+ prevp = keyp;
+
+ /*
+ * Compare the block numbers to see if there are dups.
+ */
+ if (root)
+ pp = XFS_BMAP_BROOT_PTR_ADDR(mp, block, i, sz);
+ else
+ pp = XFS_BMBT_PTR_ADDR(mp, block, i, dmxr);
+
+ for (j = i+1; j <= be16_to_cpu(block->bb_numrecs); j++) {
+ if (root)
+ thispa = XFS_BMAP_BROOT_PTR_ADDR(mp, block, j, sz);
+ else
+ thispa = XFS_BMBT_PTR_ADDR(mp, block, j, dmxr);
+ if (*thispa == *pp) {
+ xfs_warn(mp, "%s: thispa(%d) == pp(%d) %lld",
+ __func__, j, i,
+ (unsigned long long)be64_to_cpu(*thispa));
+ xfs_err(mp, "%s: ptrs are equal in node\n",
+ __func__);
+ xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
+ }
+ }
+ }
+}
+
+/*
+ * Check that the extents for the inode ip are in the right order in all
+ * btree leaves. THis becomes prohibitively expensive for large extent count
+ * files, so don't bother with inodes that have more than 10,000 extents in
+ * them. The btree record ordering checks will still be done, so for such large
+ * bmapbt constructs that is going to catch most corruptions.
+ */
+STATIC void
+xfs_bmap_check_leaf_extents(
+ struct xfs_btree_cur *cur, /* btree cursor or null */
+ xfs_inode_t *ip, /* incore inode pointer */
+ int whichfork) /* data or attr fork */
+{
+ struct xfs_mount *mp = ip->i_mount;
+ struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork);
+ struct xfs_btree_block *block; /* current btree block */
+ xfs_fsblock_t bno; /* block # of "block" */
+ struct xfs_buf *bp; /* buffer for "block" */
+ int error; /* error return value */
+ xfs_extnum_t i=0, j; /* index into the extents list */
+ int level; /* btree level, for checking */
+ __be64 *pp; /* pointer to block address */
+ xfs_bmbt_rec_t *ep; /* pointer to current extent */
+ xfs_bmbt_rec_t last = {0, 0}; /* last extent in prev block */
+ xfs_bmbt_rec_t *nextp; /* pointer to next extent */
+ int bp_release = 0;
+
+ if (ifp->if_format != XFS_DINODE_FMT_BTREE)
+ return;
+
+ /* skip large extent count inodes */
+ if (ip->i_df.if_nextents > 10000)
+ return;
+
+ bno = NULLFSBLOCK;
+ block = ifp->if_broot;
+ /*
+ * Root level must use BMAP_BROOT_PTR_ADDR macro to get ptr out.
+ */
+ level = be16_to_cpu(block->bb_level);
+ ASSERT(level > 0);
+ xfs_check_block(block, mp, 1, ifp->if_broot_bytes);
+ pp = XFS_BMAP_BROOT_PTR_ADDR(mp, block, 1, ifp->if_broot_bytes);
+ bno = be64_to_cpu(*pp);
+
+ ASSERT(bno != NULLFSBLOCK);
+ ASSERT(XFS_FSB_TO_AGNO(mp, bno) < mp->m_sb.sb_agcount);
+ ASSERT(XFS_FSB_TO_AGBNO(mp, bno) < mp->m_sb.sb_agblocks);
+
+ /*
+ * Go down the tree until leaf level is reached, following the first
+ * pointer (leftmost) at each level.
+ */
+ while (level-- > 0) {
+ /* See if buf is in cur first */
+ bp_release = 0;
+ bp = xfs_bmap_get_bp(cur, XFS_FSB_TO_DADDR(mp, bno));
+ if (!bp) {
+ bp_release = 1;
+ error = xfs_btree_read_bufl(mp, NULL, bno, &bp,
+ XFS_BMAP_BTREE_REF,
+ &xfs_bmbt_buf_ops);
+ if (error)
+ goto error_norelse;
+ }
+ block = XFS_BUF_TO_BLOCK(bp);
+ if (level == 0)
+ break;
+
+ /*
+ * Check this block for basic sanity (increasing keys and
+ * no duplicate blocks).
+ */
+
+ xfs_check_block(block, mp, 0, 0);
+ pp = XFS_BMBT_PTR_ADDR(mp, block, 1, mp->m_bmap_dmxr[1]);
+ bno = be64_to_cpu(*pp);
+ if (XFS_IS_CORRUPT(mp, !xfs_verify_fsbno(mp, bno))) {
+ error = -EFSCORRUPTED;
+ goto error0;
+ }
+ if (bp_release) {
+ bp_release = 0;
+ xfs_trans_brelse(NULL, bp);
+ }
+ }
+
+ /*
+ * Here with bp and block set to the leftmost leaf node in the tree.
+ */
+ i = 0;
+
+ /*
+ * Loop over all leaf nodes checking that all extents are in the right order.
+ */
+ for (;;) {
+ xfs_fsblock_t nextbno;
+ xfs_extnum_t num_recs;
+
+
+ num_recs = xfs_btree_get_numrecs(block);
+
+ /*
+ * Read-ahead the next leaf block, if any.
+ */
+
+ nextbno = be64_to_cpu(block->bb_u.l.bb_rightsib);
+
+ /*
+ * Check all the extents to make sure they are OK.
+ * If we had a previous block, the last entry should
+ * conform with the first entry in this one.
+ */
+
+ ep = XFS_BMBT_REC_ADDR(mp, block, 1);
+ if (i) {
+ ASSERT(xfs_bmbt_disk_get_startoff(&last) +
+ xfs_bmbt_disk_get_blockcount(&last) <=
+ xfs_bmbt_disk_get_startoff(ep));
+ }
+ for (j = 1; j < num_recs; j++) {
+ nextp = XFS_BMBT_REC_ADDR(mp, block, j + 1);
+ ASSERT(xfs_bmbt_disk_get_startoff(ep) +
+ xfs_bmbt_disk_get_blockcount(ep) <=
+ xfs_bmbt_disk_get_startoff(nextp));
+ ep = nextp;
+ }
+
+ last = *ep;
+ i += num_recs;
+ if (bp_release) {
+ bp_release = 0;
+ xfs_trans_brelse(NULL, bp);
+ }
+ bno = nextbno;
+ /*
+ * If we've reached the end, stop.
+ */
+ if (bno == NULLFSBLOCK)
+ break;
+
+ bp_release = 0;
+ bp = xfs_bmap_get_bp(cur, XFS_FSB_TO_DADDR(mp, bno));
+ if (!bp) {
+ bp_release = 1;
+ error = xfs_btree_read_bufl(mp, NULL, bno, &bp,
+ XFS_BMAP_BTREE_REF,
+ &xfs_bmbt_buf_ops);
+ if (error)
+ goto error_norelse;
+ }
+ block = XFS_BUF_TO_BLOCK(bp);
+ }
+
+ return;
+
+error0:
+ xfs_warn(mp, "%s: at error0", __func__);
+ if (bp_release)
+ xfs_trans_brelse(NULL, bp);
+error_norelse:
+ xfs_warn(mp, "%s: BAD after btree leaves for %llu extents",
+ __func__, i);
+ xfs_err(mp, "%s: CORRUPTED BTREE OR SOMETHING", __func__);
+ xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
+ return;
+}
+
+/*
+ * Validate that the bmbt_irecs being returned from bmapi are valid
+ * given the caller's original parameters. Specifically check the
+ * ranges of the returned irecs to ensure that they only extend beyond
+ * the given parameters if the XFS_BMAPI_ENTIRE flag was set.
+ */
+STATIC void
+xfs_bmap_validate_ret(
+ xfs_fileoff_t bno,
+ xfs_filblks_t len,
+ uint32_t flags,
+ xfs_bmbt_irec_t *mval,
+ int nmap,
+ int ret_nmap)
+{
+ int i; /* index to map values */
+
+ ASSERT(ret_nmap <= nmap);
+
+ for (i = 0; i < ret_nmap; i++) {
+ ASSERT(mval[i].br_blockcount > 0);
+ if (!(flags & XFS_BMAPI_ENTIRE)) {
+ ASSERT(mval[i].br_startoff >= bno);
+ ASSERT(mval[i].br_blockcount <= len);
+ ASSERT(mval[i].br_startoff + mval[i].br_blockcount <=
+ bno + len);
+ } else {
+ ASSERT(mval[i].br_startoff < bno + len);
+ ASSERT(mval[i].br_startoff + mval[i].br_blockcount >
+ bno);
+ }
+ ASSERT(i == 0 ||
+ mval[i - 1].br_startoff + mval[i - 1].br_blockcount ==
+ mval[i].br_startoff);
+ ASSERT(mval[i].br_startblock != DELAYSTARTBLOCK &&
+ mval[i].br_startblock != HOLESTARTBLOCK);
+ ASSERT(mval[i].br_state == XFS_EXT_NORM ||
+ mval[i].br_state == XFS_EXT_UNWRITTEN);
+ }
+}
+
+#else
+#define xfs_bmap_check_leaf_extents(cur, ip, whichfork) do { } while (0)
+#define xfs_bmap_validate_ret(bno,len,flags,mval,onmap,nmap) do { } while (0)
+#endif /* DEBUG */
+
+/*
+ * Inode fork format manipulation functions
+ */
+
+/*
+ * Convert the inode format to extent format if it currently is in btree format,
+ * but the extent list is small enough that it fits into the extent format.
+ *
+ * Since the extents are already in-core, all we have to do is give up the space
+ * for the btree root and pitch the leaf block.
+ */
+STATIC int /* error */
+xfs_bmap_btree_to_extents(
+ struct xfs_trans *tp, /* transaction pointer */
+ struct xfs_inode *ip, /* incore inode pointer */
+ struct xfs_btree_cur *cur, /* btree cursor */
+ int *logflagsp, /* inode logging flags */
+ int whichfork) /* data or attr fork */
+{
+ struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork);
+ struct xfs_mount *mp = ip->i_mount;
+ struct xfs_btree_block *rblock = ifp->if_broot;
+ struct xfs_btree_block *cblock;/* child btree block */
+ xfs_fsblock_t cbno; /* child block number */
+ struct xfs_buf *cbp; /* child block's buffer */
+ int error; /* error return value */
+ __be64 *pp; /* ptr to block address */
+ struct xfs_owner_info oinfo;
+
+ /* check if we actually need the extent format first: */
+ if (!xfs_bmap_wants_extents(ip, whichfork))
+ return 0;
+
+ ASSERT(cur);
+ ASSERT(whichfork != XFS_COW_FORK);
+ ASSERT(ifp->if_format == XFS_DINODE_FMT_BTREE);
+ ASSERT(be16_to_cpu(rblock->bb_level) == 1);
+ ASSERT(be16_to_cpu(rblock->bb_numrecs) == 1);
+ ASSERT(xfs_bmbt_maxrecs(mp, ifp->if_broot_bytes, 0) == 1);
+
+ pp = XFS_BMAP_BROOT_PTR_ADDR(mp, rblock, 1, ifp->if_broot_bytes);
+ cbno = be64_to_cpu(*pp);
+#ifdef DEBUG
+ if (XFS_IS_CORRUPT(cur->bc_mp, !xfs_btree_check_lptr(cur, cbno, 1)))
+ return -EFSCORRUPTED;
+#endif
+ error = xfs_btree_read_bufl(mp, tp, cbno, &cbp, XFS_BMAP_BTREE_REF,
+ &xfs_bmbt_buf_ops);
+ if (error)
+ return error;
+ cblock = XFS_BUF_TO_BLOCK(cbp);
+ if ((error = xfs_btree_check_block(cur, cblock, 0, cbp)))
+ return error;
+
+ xfs_rmap_ino_bmbt_owner(&oinfo, ip->i_ino, whichfork);
+ error = xfs_free_extent_later(cur->bc_tp, cbno, 1, &oinfo,
+ XFS_AG_RESV_NONE);
+ if (error)
+ return error;
+
+ ip->i_nblocks--;
+ xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_BCOUNT, -1L);
+ xfs_trans_binval(tp, cbp);
+ if (cur->bc_levels[0].bp == cbp)
+ cur->bc_levels[0].bp = NULL;
+ xfs_iroot_realloc(ip, -1, whichfork);
+ ASSERT(ifp->if_broot == NULL);
+ ifp->if_format = XFS_DINODE_FMT_EXTENTS;
+ *logflagsp |= XFS_ILOG_CORE | xfs_ilog_fext(whichfork);
+ return 0;
+}
+
+/*
+ * Convert an extents-format file into a btree-format file.
+ * The new file will have a root block (in the inode) and a single child block.
+ */
+STATIC int /* error */
+xfs_bmap_extents_to_btree(
+ struct xfs_trans *tp, /* transaction pointer */
+ struct xfs_inode *ip, /* incore inode pointer */
+ struct xfs_btree_cur **curp, /* cursor returned to caller */
+ int wasdel, /* converting a delayed alloc */
+ int *logflagsp, /* inode logging flags */
+ int whichfork) /* data or attr fork */
+{
+ struct xfs_btree_block *ablock; /* allocated (child) bt block */
+ struct xfs_buf *abp; /* buffer for ablock */
+ struct xfs_alloc_arg args; /* allocation arguments */
+ struct xfs_bmbt_rec *arp; /* child record pointer */
+ struct xfs_btree_block *block; /* btree root block */
+ struct xfs_btree_cur *cur; /* bmap btree cursor */
+ int error; /* error return value */
+ struct xfs_ifork *ifp; /* inode fork pointer */
+ struct xfs_bmbt_key *kp; /* root block key pointer */
+ struct xfs_mount *mp; /* mount structure */
+ xfs_bmbt_ptr_t *pp; /* root block address pointer */
+ struct xfs_iext_cursor icur;
+ struct xfs_bmbt_irec rec;
+ xfs_extnum_t cnt = 0;
+
+ mp = ip->i_mount;
+ ASSERT(whichfork != XFS_COW_FORK);
+ ifp = xfs_ifork_ptr(ip, whichfork);
+ ASSERT(ifp->if_format == XFS_DINODE_FMT_EXTENTS);
+
+ /*
+ * Make space in the inode incore. This needs to be undone if we fail
+ * to expand the root.
+ */
+ xfs_iroot_realloc(ip, 1, whichfork);
+
+ /*
+ * Fill in the root.
+ */
+ block = ifp->if_broot;
+ xfs_btree_init_block_int(mp, block, XFS_BUF_DADDR_NULL,
+ XFS_BTNUM_BMAP, 1, 1, ip->i_ino,
+ XFS_BTREE_LONG_PTRS);
+ /*
+ * Need a cursor. Can't allocate until bb_level is filled in.
+ */
+ cur = xfs_bmbt_init_cursor(mp, tp, ip, whichfork);
+ cur->bc_ino.flags = wasdel ? XFS_BTCUR_BMBT_WASDEL : 0;
+ /*
+ * Convert to a btree with two levels, one record in root.
+ */
+ ifp->if_format = XFS_DINODE_FMT_BTREE;
+ memset(&args, 0, sizeof(args));
+ args.tp = tp;
+ args.mp = mp;
+ xfs_rmap_ino_bmbt_owner(&args.oinfo, ip->i_ino, whichfork);
+
+ args.minlen = args.maxlen = args.prod = 1;
+ args.wasdel = wasdel;
+ *logflagsp = 0;
+ error = xfs_alloc_vextent_start_ag(&args,
+ XFS_INO_TO_FSB(mp, ip->i_ino));
+ if (error)
+ goto out_root_realloc;
+
+ /*
+ * Allocation can't fail, the space was reserved.
+ */
+ if (WARN_ON_ONCE(args.fsbno == NULLFSBLOCK)) {
+ error = -ENOSPC;
+ goto out_root_realloc;
+ }
+
+ cur->bc_ino.allocated++;
+ ip->i_nblocks++;
+ xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_BCOUNT, 1L);
+ error = xfs_trans_get_buf(tp, mp->m_ddev_targp,
+ XFS_FSB_TO_DADDR(mp, args.fsbno),
+ mp->m_bsize, 0, &abp);
+ if (error)
+ goto out_unreserve_dquot;
+
+ /*
+ * Fill in the child block.
+ */
+ abp->b_ops = &xfs_bmbt_buf_ops;
+ ablock = XFS_BUF_TO_BLOCK(abp);
+ xfs_btree_init_block_int(mp, ablock, xfs_buf_daddr(abp),
+ XFS_BTNUM_BMAP, 0, 0, ip->i_ino,
+ XFS_BTREE_LONG_PTRS);
+
+ for_each_xfs_iext(ifp, &icur, &rec) {
+ if (isnullstartblock(rec.br_startblock))
+ continue;
+ arp = XFS_BMBT_REC_ADDR(mp, ablock, 1 + cnt);
+ xfs_bmbt_disk_set_all(arp, &rec);
+ cnt++;
+ }
+ ASSERT(cnt == ifp->if_nextents);
+ xfs_btree_set_numrecs(ablock, cnt);
+
+ /*
+ * Fill in the root key and pointer.
+ */
+ kp = XFS_BMBT_KEY_ADDR(mp, block, 1);
+ arp = XFS_BMBT_REC_ADDR(mp, ablock, 1);
+ kp->br_startoff = cpu_to_be64(xfs_bmbt_disk_get_startoff(arp));
+ pp = XFS_BMBT_PTR_ADDR(mp, block, 1, xfs_bmbt_get_maxrecs(cur,
+ be16_to_cpu(block->bb_level)));
+ *pp = cpu_to_be64(args.fsbno);
+
+ /*
+ * Do all this logging at the end so that
+ * the root is at the right level.
+ */
+ xfs_btree_log_block(cur, abp, XFS_BB_ALL_BITS);
+ xfs_btree_log_recs(cur, abp, 1, be16_to_cpu(ablock->bb_numrecs));
+ ASSERT(*curp == NULL);
+ *curp = cur;
+ *logflagsp = XFS_ILOG_CORE | xfs_ilog_fbroot(whichfork);
+ return 0;
+
+out_unreserve_dquot:
+ xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_BCOUNT, -1L);
+out_root_realloc:
+ xfs_iroot_realloc(ip, -1, whichfork);
+ ifp->if_format = XFS_DINODE_FMT_EXTENTS;
+ ASSERT(ifp->if_broot == NULL);
+ xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
+
+ return error;
+}
+
+/*
+ * Convert a local file to an extents file.
+ * This code is out of bounds for data forks of regular files,
+ * since the file data needs to get logged so things will stay consistent.
+ * (The bmap-level manipulations are ok, though).
+ */
+void
+xfs_bmap_local_to_extents_empty(
+ struct xfs_trans *tp,
+ struct xfs_inode *ip,
+ int whichfork)
+{
+ struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork);
+
+ ASSERT(whichfork != XFS_COW_FORK);
+ ASSERT(ifp->if_format == XFS_DINODE_FMT_LOCAL);
+ ASSERT(ifp->if_bytes == 0);
+ ASSERT(ifp->if_nextents == 0);
+
+ xfs_bmap_forkoff_reset(ip, whichfork);
+ ifp->if_u1.if_root = NULL;
+ ifp->if_height = 0;
+ ifp->if_format = XFS_DINODE_FMT_EXTENTS;
+ xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
+}
+
+
+STATIC int /* error */
+xfs_bmap_local_to_extents(
+ xfs_trans_t *tp, /* transaction pointer */
+ xfs_inode_t *ip, /* incore inode pointer */
+ xfs_extlen_t total, /* total blocks needed by transaction */
+ int *logflagsp, /* inode logging flags */
+ int whichfork,
+ void (*init_fn)(struct xfs_trans *tp,
+ struct xfs_buf *bp,
+ struct xfs_inode *ip,
+ struct xfs_ifork *ifp))
+{
+ int error = 0;
+ int flags; /* logging flags returned */
+ struct xfs_ifork *ifp; /* inode fork pointer */
+ xfs_alloc_arg_t args; /* allocation arguments */
+ struct xfs_buf *bp; /* buffer for extent block */
+ struct xfs_bmbt_irec rec;
+ struct xfs_iext_cursor icur;
+
+ /*
+ * We don't want to deal with the case of keeping inode data inline yet.
+ * So sending the data fork of a regular inode is invalid.
+ */
+ ASSERT(!(S_ISREG(VFS_I(ip)->i_mode) && whichfork == XFS_DATA_FORK));
+ ifp = xfs_ifork_ptr(ip, whichfork);
+ ASSERT(ifp->if_format == XFS_DINODE_FMT_LOCAL);
+
+ if (!ifp->if_bytes) {
+ xfs_bmap_local_to_extents_empty(tp, ip, whichfork);
+ flags = XFS_ILOG_CORE;
+ goto done;
+ }
+
+ flags = 0;
+ error = 0;
+ memset(&args, 0, sizeof(args));
+ args.tp = tp;
+ args.mp = ip->i_mount;
+ args.total = total;
+ args.minlen = args.maxlen = args.prod = 1;
+ xfs_rmap_ino_owner(&args.oinfo, ip->i_ino, whichfork, 0);
+
+ /*
+ * Allocate a block. We know we need only one, since the
+ * file currently fits in an inode.
+ */
+ args.total = total;
+ args.minlen = args.maxlen = args.prod = 1;
+ error = xfs_alloc_vextent_start_ag(&args,
+ XFS_INO_TO_FSB(args.mp, ip->i_ino));
+ if (error)
+ goto done;
+
+ /* Can't fail, the space was reserved. */
+ ASSERT(args.fsbno != NULLFSBLOCK);
+ ASSERT(args.len == 1);
+ error = xfs_trans_get_buf(tp, args.mp->m_ddev_targp,
+ XFS_FSB_TO_DADDR(args.mp, args.fsbno),
+ args.mp->m_bsize, 0, &bp);
+ if (error)
+ goto done;
+
+ /*
+ * Initialize the block, copy the data and log the remote buffer.
+ *
+ * The callout is responsible for logging because the remote format
+ * might differ from the local format and thus we don't know how much to
+ * log here. Note that init_fn must also set the buffer log item type
+ * correctly.
+ */
+ init_fn(tp, bp, ip, ifp);
+
+ /* account for the change in fork size */
+ xfs_idata_realloc(ip, -ifp->if_bytes, whichfork);
+ xfs_bmap_local_to_extents_empty(tp, ip, whichfork);
+ flags |= XFS_ILOG_CORE;
+
+ ifp->if_u1.if_root = NULL;
+ ifp->if_height = 0;
+
+ rec.br_startoff = 0;
+ rec.br_startblock = args.fsbno;
+ rec.br_blockcount = 1;
+ rec.br_state = XFS_EXT_NORM;
+ xfs_iext_first(ifp, &icur);
+ xfs_iext_insert(ip, &icur, &rec, 0);
+
+ ifp->if_nextents = 1;
+ ip->i_nblocks = 1;
+ xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_BCOUNT, 1L);
+ flags |= xfs_ilog_fext(whichfork);
+
+done:
+ *logflagsp = flags;
+ return error;
+}
+
+/*
+ * Called from xfs_bmap_add_attrfork to handle btree format files.
+ */
+STATIC int /* error */
+xfs_bmap_add_attrfork_btree(
+ xfs_trans_t *tp, /* transaction pointer */
+ xfs_inode_t *ip, /* incore inode pointer */
+ int *flags) /* inode logging flags */
+{
+ struct xfs_btree_block *block = ip->i_df.if_broot;
+ struct xfs_btree_cur *cur; /* btree cursor */
+ int error; /* error return value */
+ xfs_mount_t *mp; /* file system mount struct */
+ int stat; /* newroot status */
+
+ mp = ip->i_mount;
+
+ if (XFS_BMAP_BMDR_SPACE(block) <= xfs_inode_data_fork_size(ip))
+ *flags |= XFS_ILOG_DBROOT;
+ else {
+ cur = xfs_bmbt_init_cursor(mp, tp, ip, XFS_DATA_FORK);
+ error = xfs_bmbt_lookup_first(cur, &stat);
+ if (error)
+ goto error0;
+ /* must be at least one entry */
+ if (XFS_IS_CORRUPT(mp, stat != 1)) {
+ error = -EFSCORRUPTED;
+ goto error0;
+ }
+ if ((error = xfs_btree_new_iroot(cur, flags, &stat)))
+ goto error0;
+ if (stat == 0) {
+ xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
+ return -ENOSPC;
+ }
+ cur->bc_ino.allocated = 0;
+ xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
+ }
+ return 0;
+error0:
+ xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
+ return error;
+}
+
+/*
+ * Called from xfs_bmap_add_attrfork to handle extents format files.
+ */
+STATIC int /* error */
+xfs_bmap_add_attrfork_extents(
+ struct xfs_trans *tp, /* transaction pointer */
+ struct xfs_inode *ip, /* incore inode pointer */
+ int *flags) /* inode logging flags */
+{
+ struct xfs_btree_cur *cur; /* bmap btree cursor */
+ int error; /* error return value */
+
+ if (ip->i_df.if_nextents * sizeof(struct xfs_bmbt_rec) <=
+ xfs_inode_data_fork_size(ip))
+ return 0;
+ cur = NULL;
+ error = xfs_bmap_extents_to_btree(tp, ip, &cur, 0, flags,
+ XFS_DATA_FORK);
+ if (cur) {
+ cur->bc_ino.allocated = 0;
+ xfs_btree_del_cursor(cur, error);
+ }
+ return error;
+}
+
+/*
+ * Called from xfs_bmap_add_attrfork to handle local format files. Each
+ * different data fork content type needs a different callout to do the
+ * conversion. Some are basic and only require special block initialisation
+ * callouts for the data formating, others (directories) are so specialised they
+ * handle everything themselves.
+ *
+ * XXX (dgc): investigate whether directory conversion can use the generic
+ * formatting callout. It should be possible - it's just a very complex
+ * formatter.
+ */
+STATIC int /* error */
+xfs_bmap_add_attrfork_local(
+ struct xfs_trans *tp, /* transaction pointer */
+ struct xfs_inode *ip, /* incore inode pointer */
+ int *flags) /* inode logging flags */
+{
+ struct xfs_da_args dargs; /* args for dir/attr code */
+
+ if (ip->i_df.if_bytes <= xfs_inode_data_fork_size(ip))
+ return 0;
+
+ if (S_ISDIR(VFS_I(ip)->i_mode)) {
+ memset(&dargs, 0, sizeof(dargs));
+ dargs.geo = ip->i_mount->m_dir_geo;
+ dargs.dp = ip;
+ dargs.total = dargs.geo->fsbcount;
+ dargs.whichfork = XFS_DATA_FORK;
+ dargs.trans = tp;
+ return xfs_dir2_sf_to_block(&dargs);
+ }
+
+ if (S_ISLNK(VFS_I(ip)->i_mode))
+ return xfs_bmap_local_to_extents(tp, ip, 1, flags,
+ XFS_DATA_FORK,
+ xfs_symlink_local_to_remote);
+
+ /* should only be called for types that support local format data */
+ ASSERT(0);
+ return -EFSCORRUPTED;
+}
+
+/*
+ * Set an inode attr fork offset based on the format of the data fork.
+ */
+static int
+xfs_bmap_set_attrforkoff(
+ struct xfs_inode *ip,
+ int size,
+ int *version)
+{
+ int default_size = xfs_default_attroffset(ip) >> 3;
+
+ switch (ip->i_df.if_format) {
+ case XFS_DINODE_FMT_DEV:
+ ip->i_forkoff = default_size;
+ break;
+ case XFS_DINODE_FMT_LOCAL:
+ case XFS_DINODE_FMT_EXTENTS:
+ case XFS_DINODE_FMT_BTREE:
+ ip->i_forkoff = xfs_attr_shortform_bytesfit(ip, size);
+ if (!ip->i_forkoff)
+ ip->i_forkoff = default_size;
+ else if (xfs_has_attr2(ip->i_mount) && version)
+ *version = 2;
+ break;
+ default:
+ ASSERT(0);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+/*
+ * Convert inode from non-attributed to attributed.
+ * Must not be in a transaction, ip must not be locked.
+ */
+int /* error code */
+xfs_bmap_add_attrfork(
+ xfs_inode_t *ip, /* incore inode pointer */
+ int size, /* space new attribute needs */
+ int rsvd) /* xact may use reserved blks */
+{
+ xfs_mount_t *mp; /* mount structure */
+ xfs_trans_t *tp; /* transaction pointer */
+ int blks; /* space reservation */
+ int version = 1; /* superblock attr version */
+ int logflags; /* logging flags */
+ int error; /* error return value */
+
+ ASSERT(xfs_inode_has_attr_fork(ip) == 0);
+
+ mp = ip->i_mount;
+ ASSERT(!XFS_NOT_DQATTACHED(mp, ip));
+
+ blks = XFS_ADDAFORK_SPACE_RES(mp);
+
+ error = xfs_trans_alloc_inode(ip, &M_RES(mp)->tr_addafork, blks, 0,
+ rsvd, &tp);
+ if (error)
+ return error;
+ if (xfs_inode_has_attr_fork(ip))
+ goto trans_cancel;
+
+ xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
+ error = xfs_bmap_set_attrforkoff(ip, size, &version);
+ if (error)
+ goto trans_cancel;
+
+ xfs_ifork_init_attr(ip, XFS_DINODE_FMT_EXTENTS, 0);
+ logflags = 0;
+ switch (ip->i_df.if_format) {
+ case XFS_DINODE_FMT_LOCAL:
+ error = xfs_bmap_add_attrfork_local(tp, ip, &logflags);
+ break;
+ case XFS_DINODE_FMT_EXTENTS:
+ error = xfs_bmap_add_attrfork_extents(tp, ip, &logflags);
+ break;
+ case XFS_DINODE_FMT_BTREE:
+ error = xfs_bmap_add_attrfork_btree(tp, ip, &logflags);
+ break;
+ default:
+ error = 0;
+ break;
+ }
+ if (logflags)
+ xfs_trans_log_inode(tp, ip, logflags);
+ if (error)
+ goto trans_cancel;
+ if (!xfs_has_attr(mp) ||
+ (!xfs_has_attr2(mp) && version == 2)) {
+ bool log_sb = false;
+
+ spin_lock(&mp->m_sb_lock);
+ if (!xfs_has_attr(mp)) {
+ xfs_add_attr(mp);
+ log_sb = true;
+ }
+ if (!xfs_has_attr2(mp) && version == 2) {
+ xfs_add_attr2(mp);
+ log_sb = true;
+ }
+ spin_unlock(&mp->m_sb_lock);
+ if (log_sb)
+ xfs_log_sb(tp);
+ }
+
+ error = xfs_trans_commit(tp);
+ xfs_iunlock(ip, XFS_ILOCK_EXCL);
+ return error;
+
+trans_cancel:
+ xfs_trans_cancel(tp);
+ xfs_iunlock(ip, XFS_ILOCK_EXCL);
+ return error;
+}
+
+/*
+ * Internal and external extent tree search functions.
+ */
+
+struct xfs_iread_state {
+ struct xfs_iext_cursor icur;
+ xfs_extnum_t loaded;
+};
+
+int
+xfs_bmap_complain_bad_rec(
+ struct xfs_inode *ip,
+ int whichfork,
+ xfs_failaddr_t fa,
+ const struct xfs_bmbt_irec *irec)
+{
+ struct xfs_mount *mp = ip->i_mount;
+ const char *forkname;
+
+ switch (whichfork) {
+ case XFS_DATA_FORK: forkname = "data"; break;
+ case XFS_ATTR_FORK: forkname = "attr"; break;
+ case XFS_COW_FORK: forkname = "CoW"; break;
+ default: forkname = "???"; break;
+ }
+
+ xfs_warn(mp,
+ "Bmap BTree record corruption in inode 0x%llx %s fork detected at %pS!",
+ ip->i_ino, forkname, fa);
+ xfs_warn(mp,
+ "Offset 0x%llx, start block 0x%llx, block count 0x%llx state 0x%x",
+ irec->br_startoff, irec->br_startblock, irec->br_blockcount,
+ irec->br_state);
+
+ return -EFSCORRUPTED;
+}
+
+/* Stuff every bmbt record from this block into the incore extent map. */
+static int
+xfs_iread_bmbt_block(
+ struct xfs_btree_cur *cur,
+ int level,
+ void *priv)
+{
+ struct xfs_iread_state *ir = priv;
+ struct xfs_mount *mp = cur->bc_mp;
+ struct xfs_inode *ip = cur->bc_ino.ip;
+ struct xfs_btree_block *block;
+ struct xfs_buf *bp;
+ struct xfs_bmbt_rec *frp;
+ xfs_extnum_t num_recs;
+ xfs_extnum_t j;
+ int whichfork = cur->bc_ino.whichfork;
+ struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork);
+
+ block = xfs_btree_get_block(cur, level, &bp);
+
+ /* Abort if we find more records than nextents. */
+ num_recs = xfs_btree_get_numrecs(block);
+ if (unlikely(ir->loaded + num_recs > ifp->if_nextents)) {
+ xfs_warn(ip->i_mount, "corrupt dinode %llu, (btree extents).",
+ (unsigned long long)ip->i_ino);
+ xfs_inode_verifier_error(ip, -EFSCORRUPTED, __func__, block,
+ sizeof(*block), __this_address);
+ return -EFSCORRUPTED;
+ }
+
+ /* Copy records into the incore cache. */
+ frp = XFS_BMBT_REC_ADDR(mp, block, 1);
+ for (j = 0; j < num_recs; j++, frp++, ir->loaded++) {
+ struct xfs_bmbt_irec new;
+ xfs_failaddr_t fa;
+
+ xfs_bmbt_disk_get_all(frp, &new);
+ fa = xfs_bmap_validate_extent(ip, whichfork, &new);
+ if (fa) {
+ xfs_inode_verifier_error(ip, -EFSCORRUPTED,
+ "xfs_iread_extents(2)", frp,
+ sizeof(*frp), fa);
+ return xfs_bmap_complain_bad_rec(ip, whichfork, fa,
+ &new);
+ }
+ xfs_iext_insert(ip, &ir->icur, &new,
+ xfs_bmap_fork_to_state(whichfork));
+ trace_xfs_read_extent(ip, &ir->icur,
+ xfs_bmap_fork_to_state(whichfork), _THIS_IP_);
+ xfs_iext_next(ifp, &ir->icur);
+ }
+
+ return 0;
+}
+
+/*
+ * Read in extents from a btree-format inode.
+ */
+int
+xfs_iread_extents(
+ struct xfs_trans *tp,
+ struct xfs_inode *ip,
+ int whichfork)
+{
+ struct xfs_iread_state ir;
+ struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork);
+ struct xfs_mount *mp = ip->i_mount;
+ struct xfs_btree_cur *cur;
+ int error;
+
+ if (!xfs_need_iread_extents(ifp))
+ return 0;
+
+ ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
+
+ ir.loaded = 0;
+ xfs_iext_first(ifp, &ir.icur);
+ cur = xfs_bmbt_init_cursor(mp, tp, ip, whichfork);
+ error = xfs_btree_visit_blocks(cur, xfs_iread_bmbt_block,
+ XFS_BTREE_VISIT_RECORDS, &ir);
+ xfs_btree_del_cursor(cur, error);
+ if (error)
+ goto out;
+
+ if (XFS_IS_CORRUPT(mp, ir.loaded != ifp->if_nextents)) {
+ error = -EFSCORRUPTED;
+ goto out;
+ }
+ ASSERT(ir.loaded == xfs_iext_count(ifp));
+ /*
+ * Use release semantics so that we can use acquire semantics in
+ * xfs_need_iread_extents and be guaranteed to see a valid mapping tree
+ * after that load.
+ */
+ smp_store_release(&ifp->if_needextents, 0);
+ return 0;
+out:
+ xfs_iext_destroy(ifp);
+ return error;
+}
+
+/*
+ * Returns the relative block number of the first unused block(s) in the given
+ * fork with at least "len" logically contiguous blocks free. This is the
+ * lowest-address hole if the fork has holes, else the first block past the end
+ * of fork. Return 0 if the fork is currently local (in-inode).
+ */
+int /* error */
+xfs_bmap_first_unused(
+ struct xfs_trans *tp, /* transaction pointer */
+ struct xfs_inode *ip, /* incore inode */
+ xfs_extlen_t len, /* size of hole to find */
+ xfs_fileoff_t *first_unused, /* unused block */
+ int whichfork) /* data or attr fork */
+{
+ struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork);
+ struct xfs_bmbt_irec got;
+ struct xfs_iext_cursor icur;
+ xfs_fileoff_t lastaddr = 0;
+ xfs_fileoff_t lowest, max;
+ int error;
+
+ if (ifp->if_format == XFS_DINODE_FMT_LOCAL) {
+ *first_unused = 0;
+ return 0;
+ }
+
+ ASSERT(xfs_ifork_has_extents(ifp));
+
+ error = xfs_iread_extents(tp, ip, whichfork);
+ if (error)
+ return error;
+
+ lowest = max = *first_unused;
+ for_each_xfs_iext(ifp, &icur, &got) {
+ /*
+ * See if the hole before this extent will work.
+ */
+ if (got.br_startoff >= lowest + len &&
+ got.br_startoff - max >= len)
+ break;
+ lastaddr = got.br_startoff + got.br_blockcount;
+ max = XFS_FILEOFF_MAX(lastaddr, lowest);
+ }
+
+ *first_unused = max;
+ return 0;
+}
+
+/*
+ * Returns the file-relative block number of the last block - 1 before
+ * last_block (input value) in the file.
+ * This is not based on i_size, it is based on the extent records.
+ * Returns 0 for local files, as they do not have extent records.
+ */
+int /* error */
+xfs_bmap_last_before(
+ struct xfs_trans *tp, /* transaction pointer */
+ struct xfs_inode *ip, /* incore inode */
+ xfs_fileoff_t *last_block, /* last block */
+ int whichfork) /* data or attr fork */
+{
+ struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork);
+ struct xfs_bmbt_irec got;
+ struct xfs_iext_cursor icur;
+ int error;
+
+ switch (ifp->if_format) {
+ case XFS_DINODE_FMT_LOCAL:
+ *last_block = 0;
+ return 0;
+ case XFS_DINODE_FMT_BTREE:
+ case XFS_DINODE_FMT_EXTENTS:
+ break;
+ default:
+ ASSERT(0);
+ return -EFSCORRUPTED;
+ }
+
+ error = xfs_iread_extents(tp, ip, whichfork);
+ if (error)
+ return error;
+
+ if (!xfs_iext_lookup_extent_before(ip, ifp, last_block, &icur, &got))
+ *last_block = 0;
+ return 0;
+}
+
+int
+xfs_bmap_last_extent(
+ struct xfs_trans *tp,
+ struct xfs_inode *ip,
+ int whichfork,
+ struct xfs_bmbt_irec *rec,
+ int *is_empty)
+{
+ struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork);
+ struct xfs_iext_cursor icur;
+ int error;
+
+ error = xfs_iread_extents(tp, ip, whichfork);
+ if (error)
+ return error;
+
+ xfs_iext_last(ifp, &icur);
+ if (!xfs_iext_get_extent(ifp, &icur, rec))
+ *is_empty = 1;
+ else
+ *is_empty = 0;
+ return 0;
+}
+
+/*
+ * Check the last inode extent to determine whether this allocation will result
+ * in blocks being allocated at the end of the file. When we allocate new data
+ * blocks at the end of the file which do not start at the previous data block,
+ * we will try to align the new blocks at stripe unit boundaries.
+ *
+ * Returns 1 in bma->aeof if the file (fork) is empty as any new write will be
+ * at, or past the EOF.
+ */
+STATIC int
+xfs_bmap_isaeof(
+ struct xfs_bmalloca *bma,
+ int whichfork)
+{
+ struct xfs_bmbt_irec rec;
+ int is_empty;
+ int error;
+
+ bma->aeof = false;
+ error = xfs_bmap_last_extent(NULL, bma->ip, whichfork, &rec,
+ &is_empty);
+ if (error)
+ return error;
+
+ if (is_empty) {
+ bma->aeof = true;
+ return 0;
+ }
+
+ /*
+ * Check if we are allocation or past the last extent, or at least into
+ * the last delayed allocated extent.
+ */
+ bma->aeof = bma->offset >= rec.br_startoff + rec.br_blockcount ||
+ (bma->offset >= rec.br_startoff &&
+ isnullstartblock(rec.br_startblock));
+ return 0;
+}
+
+/*
+ * Returns the file-relative block number of the first block past eof in
+ * the file. This is not based on i_size, it is based on the extent records.
+ * Returns 0 for local files, as they do not have extent records.
+ */
+int
+xfs_bmap_last_offset(
+ struct xfs_inode *ip,
+ xfs_fileoff_t *last_block,
+ int whichfork)
+{
+ struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork);
+ struct xfs_bmbt_irec rec;
+ int is_empty;
+ int error;
+
+ *last_block = 0;
+
+ if (ifp->if_format == XFS_DINODE_FMT_LOCAL)
+ return 0;
+
+ if (XFS_IS_CORRUPT(ip->i_mount, !xfs_ifork_has_extents(ifp)))
+ return -EFSCORRUPTED;
+
+ error = xfs_bmap_last_extent(NULL, ip, whichfork, &rec, &is_empty);
+ if (error || is_empty)
+ return error;
+
+ *last_block = rec.br_startoff + rec.br_blockcount;
+ return 0;
+}
+
+/*
+ * Extent tree manipulation functions used during allocation.
+ */
+
+/*
+ * Convert a delayed allocation to a real allocation.
+ */
+STATIC int /* error */
+xfs_bmap_add_extent_delay_real(
+ struct xfs_bmalloca *bma,
+ int whichfork)
+{
+ struct xfs_mount *mp = bma->ip->i_mount;
+ struct xfs_ifork *ifp = xfs_ifork_ptr(bma->ip, whichfork);
+ struct xfs_bmbt_irec *new = &bma->got;
+ int error; /* error return value */
+ int i; /* temp state */
+ xfs_fileoff_t new_endoff; /* end offset of new entry */
+ xfs_bmbt_irec_t r[3]; /* neighbor extent entries */
+ /* left is 0, right is 1, prev is 2 */
+ int rval=0; /* return value (logging flags) */
+ uint32_t state = xfs_bmap_fork_to_state(whichfork);
+ xfs_filblks_t da_new; /* new count del alloc blocks used */
+ xfs_filblks_t da_old; /* old count del alloc blocks used */
+ xfs_filblks_t temp=0; /* value for da_new calculations */
+ int tmp_rval; /* partial logging flags */
+ struct xfs_bmbt_irec old;
+
+ ASSERT(whichfork != XFS_ATTR_FORK);
+ ASSERT(!isnullstartblock(new->br_startblock));
+ ASSERT(!bma->cur ||
+ (bma->cur->bc_ino.flags & XFS_BTCUR_BMBT_WASDEL));
+
+ XFS_STATS_INC(mp, xs_add_exlist);
+
+#define LEFT r[0]
+#define RIGHT r[1]
+#define PREV r[2]
+
+ /*
+ * Set up a bunch of variables to make the tests simpler.
+ */
+ xfs_iext_get_extent(ifp, &bma->icur, &PREV);
+ new_endoff = new->br_startoff + new->br_blockcount;
+ ASSERT(isnullstartblock(PREV.br_startblock));
+ ASSERT(PREV.br_startoff <= new->br_startoff);
+ ASSERT(PREV.br_startoff + PREV.br_blockcount >= new_endoff);
+
+ da_old = startblockval(PREV.br_startblock);
+ da_new = 0;
+
+ /*
+ * Set flags determining what part of the previous delayed allocation
+ * extent is being replaced by a real allocation.
+ */
+ if (PREV.br_startoff == new->br_startoff)
+ state |= BMAP_LEFT_FILLING;
+ if (PREV.br_startoff + PREV.br_blockcount == new_endoff)
+ state |= BMAP_RIGHT_FILLING;
+
+ /*
+ * Check and set flags if this segment has a left neighbor.
+ * Don't set contiguous if the combined extent would be too large.
+ */
+ if (xfs_iext_peek_prev_extent(ifp, &bma->icur, &LEFT)) {
+ state |= BMAP_LEFT_VALID;
+ if (isnullstartblock(LEFT.br_startblock))
+ state |= BMAP_LEFT_DELAY;
+ }
+
+ if ((state & BMAP_LEFT_VALID) && !(state & BMAP_LEFT_DELAY) &&
+ LEFT.br_startoff + LEFT.br_blockcount == new->br_startoff &&
+ LEFT.br_startblock + LEFT.br_blockcount == new->br_startblock &&
+ LEFT.br_state == new->br_state &&
+ LEFT.br_blockcount + new->br_blockcount <= XFS_MAX_BMBT_EXTLEN)
+ state |= BMAP_LEFT_CONTIG;
+
+ /*
+ * Check and set flags if this segment has a right neighbor.
+ * Don't set contiguous if the combined extent would be too large.
+ * Also check for all-three-contiguous being too large.
+ */
+ if (xfs_iext_peek_next_extent(ifp, &bma->icur, &RIGHT)) {
+ state |= BMAP_RIGHT_VALID;
+ if (isnullstartblock(RIGHT.br_startblock))
+ state |= BMAP_RIGHT_DELAY;
+ }
+
+ if ((state & BMAP_RIGHT_VALID) && !(state & BMAP_RIGHT_DELAY) &&
+ new_endoff == RIGHT.br_startoff &&
+ new->br_startblock + new->br_blockcount == RIGHT.br_startblock &&
+ new->br_state == RIGHT.br_state &&
+ new->br_blockcount + RIGHT.br_blockcount <= XFS_MAX_BMBT_EXTLEN &&
+ ((state & (BMAP_LEFT_CONTIG | BMAP_LEFT_FILLING |
+ BMAP_RIGHT_FILLING)) !=
+ (BMAP_LEFT_CONTIG | BMAP_LEFT_FILLING |
+ BMAP_RIGHT_FILLING) ||
+ LEFT.br_blockcount + new->br_blockcount + RIGHT.br_blockcount
+ <= XFS_MAX_BMBT_EXTLEN))
+ state |= BMAP_RIGHT_CONTIG;
+
+ error = 0;
+ /*
+ * Switch out based on the FILLING and CONTIG state bits.
+ */
+ switch (state & (BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG |
+ BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG)) {
+ case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG |
+ BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
+ /*
+ * Filling in all of a previously delayed allocation extent.
+ * The left and right neighbors are both contiguous with new.
+ */
+ LEFT.br_blockcount += PREV.br_blockcount + RIGHT.br_blockcount;
+
+ xfs_iext_remove(bma->ip, &bma->icur, state);
+ xfs_iext_remove(bma->ip, &bma->icur, state);
+ xfs_iext_prev(ifp, &bma->icur);
+ xfs_iext_update_extent(bma->ip, state, &bma->icur, &LEFT);
+ ifp->if_nextents--;
+
+ if (bma->cur == NULL)
+ rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
+ else {
+ rval = XFS_ILOG_CORE;
+ error = xfs_bmbt_lookup_eq(bma->cur, &RIGHT, &i);
+ if (error)
+ goto done;
+ if (XFS_IS_CORRUPT(mp, i != 1)) {
+ error = -EFSCORRUPTED;
+ goto done;
+ }
+ error = xfs_btree_delete(bma->cur, &i);
+ if (error)
+ goto done;
+ if (XFS_IS_CORRUPT(mp, i != 1)) {
+ error = -EFSCORRUPTED;
+ goto done;
+ }
+ error = xfs_btree_decrement(bma->cur, 0, &i);
+ if (error)
+ goto done;
+ if (XFS_IS_CORRUPT(mp, i != 1)) {
+ error = -EFSCORRUPTED;
+ goto done;
+ }
+ error = xfs_bmbt_update(bma->cur, &LEFT);
+ if (error)
+ goto done;
+ }
+ break;
+
+ case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG:
+ /*
+ * Filling in all of a previously delayed allocation extent.
+ * The left neighbor is contiguous, the right is not.
+ */
+ old = LEFT;
+ LEFT.br_blockcount += PREV.br_blockcount;
+
+ xfs_iext_remove(bma->ip, &bma->icur, state);
+ xfs_iext_prev(ifp, &bma->icur);
+ xfs_iext_update_extent(bma->ip, state, &bma->icur, &LEFT);
+
+ if (bma->cur == NULL)
+ rval = XFS_ILOG_DEXT;
+ else {
+ rval = 0;
+ error = xfs_bmbt_lookup_eq(bma->cur, &old, &i);
+ if (error)
+ goto done;
+ if (XFS_IS_CORRUPT(mp, i != 1)) {
+ error = -EFSCORRUPTED;
+ goto done;
+ }
+ error = xfs_bmbt_update(bma->cur, &LEFT);
+ if (error)
+ goto done;
+ }
+ break;
+
+ case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
+ /*
+ * Filling in all of a previously delayed allocation extent.
+ * The right neighbor is contiguous, the left is not. Take care
+ * with delay -> unwritten extent allocation here because the
+ * delalloc record we are overwriting is always written.
+ */
+ PREV.br_startblock = new->br_startblock;
+ PREV.br_blockcount += RIGHT.br_blockcount;
+ PREV.br_state = new->br_state;
+
+ xfs_iext_next(ifp, &bma->icur);
+ xfs_iext_remove(bma->ip, &bma->icur, state);
+ xfs_iext_prev(ifp, &bma->icur);
+ xfs_iext_update_extent(bma->ip, state, &bma->icur, &PREV);
+
+ if (bma->cur == NULL)
+ rval = XFS_ILOG_DEXT;
+ else {
+ rval = 0;
+ error = xfs_bmbt_lookup_eq(bma->cur, &RIGHT, &i);
+ if (error)
+ goto done;
+ if (XFS_IS_CORRUPT(mp, i != 1)) {
+ error = -EFSCORRUPTED;
+ goto done;
+ }
+ error = xfs_bmbt_update(bma->cur, &PREV);
+ if (error)
+ goto done;
+ }
+ break;
+
+ case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING:
+ /*
+ * Filling in all of a previously delayed allocation extent.
+ * Neither the left nor right neighbors are contiguous with
+ * the new one.
+ */
+ PREV.br_startblock = new->br_startblock;
+ PREV.br_state = new->br_state;
+ xfs_iext_update_extent(bma->ip, state, &bma->icur, &PREV);
+ ifp->if_nextents++;
+
+ if (bma->cur == NULL)
+ rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
+ else {
+ rval = XFS_ILOG_CORE;
+ error = xfs_bmbt_lookup_eq(bma->cur, new, &i);
+ if (error)
+ goto done;
+ if (XFS_IS_CORRUPT(mp, i != 0)) {
+ error = -EFSCORRUPTED;
+ goto done;
+ }
+ error = xfs_btree_insert(bma->cur, &i);
+ if (error)
+ goto done;
+ if (XFS_IS_CORRUPT(mp, i != 1)) {
+ error = -EFSCORRUPTED;
+ goto done;
+ }
+ }
+ break;
+
+ case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG:
+ /*
+ * Filling in the first part of a previous delayed allocation.
+ * The left neighbor is contiguous.
+ */
+ old = LEFT;
+ temp = PREV.br_blockcount - new->br_blockcount;
+ da_new = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(bma->ip, temp),
+ startblockval(PREV.br_startblock));
+
+ LEFT.br_blockcount += new->br_blockcount;
+
+ PREV.br_blockcount = temp;
+ PREV.br_startoff += new->br_blockcount;
+ PREV.br_startblock = nullstartblock(da_new);
+
+ xfs_iext_update_extent(bma->ip, state, &bma->icur, &PREV);
+ xfs_iext_prev(ifp, &bma->icur);
+ xfs_iext_update_extent(bma->ip, state, &bma->icur, &LEFT);
+
+ if (bma->cur == NULL)
+ rval = XFS_ILOG_DEXT;
+ else {
+ rval = 0;
+ error = xfs_bmbt_lookup_eq(bma->cur, &old, &i);
+ if (error)
+ goto done;
+ if (XFS_IS_CORRUPT(mp, i != 1)) {
+ error = -EFSCORRUPTED;
+ goto done;
+ }
+ error = xfs_bmbt_update(bma->cur, &LEFT);
+ if (error)
+ goto done;
+ }
+ break;
+
+ case BMAP_LEFT_FILLING:
+ /*
+ * Filling in the first part of a previous delayed allocation.
+ * The left neighbor is not contiguous.
+ */
+ xfs_iext_update_extent(bma->ip, state, &bma->icur, new);
+ ifp->if_nextents++;
+
+ if (bma->cur == NULL)
+ rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
+ else {
+ rval = XFS_ILOG_CORE;
+ error = xfs_bmbt_lookup_eq(bma->cur, new, &i);
+ if (error)
+ goto done;
+ if (XFS_IS_CORRUPT(mp, i != 0)) {
+ error = -EFSCORRUPTED;
+ goto done;
+ }
+ error = xfs_btree_insert(bma->cur, &i);
+ if (error)
+ goto done;
+ if (XFS_IS_CORRUPT(mp, i != 1)) {
+ error = -EFSCORRUPTED;
+ goto done;
+ }
+ }
+
+ if (xfs_bmap_needs_btree(bma->ip, whichfork)) {
+ error = xfs_bmap_extents_to_btree(bma->tp, bma->ip,
+ &bma->cur, 1, &tmp_rval, whichfork);
+ rval |= tmp_rval;
+ if (error)
+ goto done;
+ }
+
+ temp = PREV.br_blockcount - new->br_blockcount;
+ da_new = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(bma->ip, temp),
+ startblockval(PREV.br_startblock) -
+ (bma->cur ? bma->cur->bc_ino.allocated : 0));
+
+ PREV.br_startoff = new_endoff;
+ PREV.br_blockcount = temp;
+ PREV.br_startblock = nullstartblock(da_new);
+ xfs_iext_next(ifp, &bma->icur);
+ xfs_iext_insert(bma->ip, &bma->icur, &PREV, state);
+ xfs_iext_prev(ifp, &bma->icur);
+ break;
+
+ case BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
+ /*
+ * Filling in the last part of a previous delayed allocation.
+ * The right neighbor is contiguous with the new allocation.
+ */
+ old = RIGHT;
+ RIGHT.br_startoff = new->br_startoff;
+ RIGHT.br_startblock = new->br_startblock;
+ RIGHT.br_blockcount += new->br_blockcount;
+
+ if (bma->cur == NULL)
+ rval = XFS_ILOG_DEXT;
+ else {
+ rval = 0;
+ error = xfs_bmbt_lookup_eq(bma->cur, &old, &i);
+ if (error)
+ goto done;
+ if (XFS_IS_CORRUPT(mp, i != 1)) {
+ error = -EFSCORRUPTED;
+ goto done;
+ }
+ error = xfs_bmbt_update(bma->cur, &RIGHT);
+ if (error)
+ goto done;
+ }
+
+ temp = PREV.br_blockcount - new->br_blockcount;
+ da_new = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(bma->ip, temp),
+ startblockval(PREV.br_startblock));
+
+ PREV.br_blockcount = temp;
+ PREV.br_startblock = nullstartblock(da_new);
+
+ xfs_iext_update_extent(bma->ip, state, &bma->icur, &PREV);
+ xfs_iext_next(ifp, &bma->icur);
+ xfs_iext_update_extent(bma->ip, state, &bma->icur, &RIGHT);
+ break;
+
+ case BMAP_RIGHT_FILLING:
+ /*
+ * Filling in the last part of a previous delayed allocation.
+ * The right neighbor is not contiguous.
+ */
+ xfs_iext_update_extent(bma->ip, state, &bma->icur, new);
+ ifp->if_nextents++;
+
+ if (bma->cur == NULL)
+ rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
+ else {
+ rval = XFS_ILOG_CORE;
+ error = xfs_bmbt_lookup_eq(bma->cur, new, &i);
+ if (error)
+ goto done;
+ if (XFS_IS_CORRUPT(mp, i != 0)) {
+ error = -EFSCORRUPTED;
+ goto done;
+ }
+ error = xfs_btree_insert(bma->cur, &i);
+ if (error)
+ goto done;
+ if (XFS_IS_CORRUPT(mp, i != 1)) {
+ error = -EFSCORRUPTED;
+ goto done;
+ }
+ }
+
+ if (xfs_bmap_needs_btree(bma->ip, whichfork)) {
+ error = xfs_bmap_extents_to_btree(bma->tp, bma->ip,
+ &bma->cur, 1, &tmp_rval, whichfork);
+ rval |= tmp_rval;
+ if (error)
+ goto done;
+ }
+
+ temp = PREV.br_blockcount - new->br_blockcount;
+ da_new = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(bma->ip, temp),
+ startblockval(PREV.br_startblock) -
+ (bma->cur ? bma->cur->bc_ino.allocated : 0));
+
+ PREV.br_startblock = nullstartblock(da_new);
+ PREV.br_blockcount = temp;
+ xfs_iext_insert(bma->ip, &bma->icur, &PREV, state);
+ xfs_iext_next(ifp, &bma->icur);
+ break;
+
+ case 0:
+ /*
+ * Filling in the middle part of a previous delayed allocation.
+ * Contiguity is impossible here.
+ * This case is avoided almost all the time.
+ *
+ * We start with a delayed allocation:
+ *
+ * +ddddddddddddddddddddddddddddddddddddddddddddddddddddddd+
+ * PREV @ idx
+ *
+ * and we are allocating:
+ * +rrrrrrrrrrrrrrrrr+
+ * new
+ *
+ * and we set it up for insertion as:
+ * +ddddddddddddddddddd+rrrrrrrrrrrrrrrrr+ddddddddddddddddd+
+ * new
+ * PREV @ idx LEFT RIGHT
+ * inserted at idx + 1
+ */
+ old = PREV;
+
+ /* LEFT is the new middle */
+ LEFT = *new;
+
+ /* RIGHT is the new right */
+ RIGHT.br_state = PREV.br_state;
+ RIGHT.br_startoff = new_endoff;
+ RIGHT.br_blockcount =
+ PREV.br_startoff + PREV.br_blockcount - new_endoff;
+ RIGHT.br_startblock =
+ nullstartblock(xfs_bmap_worst_indlen(bma->ip,
+ RIGHT.br_blockcount));
+
+ /* truncate PREV */
+ PREV.br_blockcount = new->br_startoff - PREV.br_startoff;
+ PREV.br_startblock =
+ nullstartblock(xfs_bmap_worst_indlen(bma->ip,
+ PREV.br_blockcount));
+ xfs_iext_update_extent(bma->ip, state, &bma->icur, &PREV);
+
+ xfs_iext_next(ifp, &bma->icur);
+ xfs_iext_insert(bma->ip, &bma->icur, &RIGHT, state);
+ xfs_iext_insert(bma->ip, &bma->icur, &LEFT, state);
+ ifp->if_nextents++;
+
+ if (bma->cur == NULL)
+ rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
+ else {
+ rval = XFS_ILOG_CORE;
+ error = xfs_bmbt_lookup_eq(bma->cur, new, &i);
+ if (error)
+ goto done;
+ if (XFS_IS_CORRUPT(mp, i != 0)) {
+ error = -EFSCORRUPTED;
+ goto done;
+ }
+ error = xfs_btree_insert(bma->cur, &i);
+ if (error)
+ goto done;
+ if (XFS_IS_CORRUPT(mp, i != 1)) {
+ error = -EFSCORRUPTED;
+ goto done;
+ }
+ }
+
+ if (xfs_bmap_needs_btree(bma->ip, whichfork)) {
+ error = xfs_bmap_extents_to_btree(bma->tp, bma->ip,
+ &bma->cur, 1, &tmp_rval, whichfork);
+ rval |= tmp_rval;
+ if (error)
+ goto done;
+ }
+
+ da_new = startblockval(PREV.br_startblock) +
+ startblockval(RIGHT.br_startblock);
+ break;
+
+ case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
+ case BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
+ case BMAP_LEFT_FILLING | BMAP_RIGHT_CONTIG:
+ case BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG:
+ case BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
+ case BMAP_LEFT_CONTIG:
+ case BMAP_RIGHT_CONTIG:
+ /*
+ * These cases are all impossible.
+ */
+ ASSERT(0);
+ }
+
+ /* add reverse mapping unless caller opted out */
+ if (!(bma->flags & XFS_BMAPI_NORMAP))
+ xfs_rmap_map_extent(bma->tp, bma->ip, whichfork, new);
+
+ /* convert to a btree if necessary */
+ if (xfs_bmap_needs_btree(bma->ip, whichfork)) {
+ int tmp_logflags; /* partial log flag return val */
+
+ ASSERT(bma->cur == NULL);
+ error = xfs_bmap_extents_to_btree(bma->tp, bma->ip,
+ &bma->cur, da_old > 0, &tmp_logflags,
+ whichfork);
+ bma->logflags |= tmp_logflags;
+ if (error)
+ goto done;
+ }
+
+ if (da_new != da_old)
+ xfs_mod_delalloc(mp, (int64_t)da_new - da_old);
+
+ if (bma->cur) {
+ da_new += bma->cur->bc_ino.allocated;
+ bma->cur->bc_ino.allocated = 0;
+ }
+
+ /* adjust for changes in reserved delayed indirect blocks */
+ if (da_new != da_old) {
+ ASSERT(state == 0 || da_new < da_old);
+ error = xfs_mod_fdblocks(mp, (int64_t)(da_old - da_new),
+ false);
+ }
+
+ xfs_bmap_check_leaf_extents(bma->cur, bma->ip, whichfork);
+done:
+ if (whichfork != XFS_COW_FORK)
+ bma->logflags |= rval;
+ return error;
+#undef LEFT
+#undef RIGHT
+#undef PREV
+}
+
+/*
+ * Convert an unwritten allocation to a real allocation or vice versa.
+ */
+int /* error */
+xfs_bmap_add_extent_unwritten_real(
+ struct xfs_trans *tp,
+ xfs_inode_t *ip, /* incore inode pointer */
+ int whichfork,
+ struct xfs_iext_cursor *icur,
+ struct xfs_btree_cur **curp, /* if *curp is null, not a btree */
+ xfs_bmbt_irec_t *new, /* new data to add to file extents */
+ int *logflagsp) /* inode logging flags */
+{
+ struct xfs_btree_cur *cur; /* btree cursor */
+ int error; /* error return value */
+ int i; /* temp state */
+ struct xfs_ifork *ifp; /* inode fork pointer */
+ xfs_fileoff_t new_endoff; /* end offset of new entry */
+ xfs_bmbt_irec_t r[3]; /* neighbor extent entries */
+ /* left is 0, right is 1, prev is 2 */
+ int rval=0; /* return value (logging flags) */
+ uint32_t state = xfs_bmap_fork_to_state(whichfork);
+ struct xfs_mount *mp = ip->i_mount;
+ struct xfs_bmbt_irec old;
+
+ *logflagsp = 0;
+
+ cur = *curp;
+ ifp = xfs_ifork_ptr(ip, whichfork);
+
+ ASSERT(!isnullstartblock(new->br_startblock));
+
+ XFS_STATS_INC(mp, xs_add_exlist);
+
+#define LEFT r[0]
+#define RIGHT r[1]
+#define PREV r[2]
+
+ /*
+ * Set up a bunch of variables to make the tests simpler.
+ */
+ error = 0;
+ xfs_iext_get_extent(ifp, icur, &PREV);
+ ASSERT(new->br_state != PREV.br_state);
+ new_endoff = new->br_startoff + new->br_blockcount;
+ ASSERT(PREV.br_startoff <= new->br_startoff);
+ ASSERT(PREV.br_startoff + PREV.br_blockcount >= new_endoff);
+
+ /*
+ * Set flags determining what part of the previous oldext allocation
+ * extent is being replaced by a newext allocation.
+ */
+ if (PREV.br_startoff == new->br_startoff)
+ state |= BMAP_LEFT_FILLING;
+ if (PREV.br_startoff + PREV.br_blockcount == new_endoff)
+ state |= BMAP_RIGHT_FILLING;
+
+ /*
+ * Check and set flags if this segment has a left neighbor.
+ * Don't set contiguous if the combined extent would be too large.
+ */
+ if (xfs_iext_peek_prev_extent(ifp, icur, &LEFT)) {
+ state |= BMAP_LEFT_VALID;
+ if (isnullstartblock(LEFT.br_startblock))
+ state |= BMAP_LEFT_DELAY;
+ }
+
+ if ((state & BMAP_LEFT_VALID) && !(state & BMAP_LEFT_DELAY) &&
+ LEFT.br_startoff + LEFT.br_blockcount == new->br_startoff &&
+ LEFT.br_startblock + LEFT.br_blockcount == new->br_startblock &&
+ LEFT.br_state == new->br_state &&
+ LEFT.br_blockcount + new->br_blockcount <= XFS_MAX_BMBT_EXTLEN)
+ state |= BMAP_LEFT_CONTIG;
+
+ /*
+ * Check and set flags if this segment has a right neighbor.
+ * Don't set contiguous if the combined extent would be too large.
+ * Also check for all-three-contiguous being too large.
+ */
+ if (xfs_iext_peek_next_extent(ifp, icur, &RIGHT)) {
+ state |= BMAP_RIGHT_VALID;
+ if (isnullstartblock(RIGHT.br_startblock))
+ state |= BMAP_RIGHT_DELAY;
+ }
+
+ if ((state & BMAP_RIGHT_VALID) && !(state & BMAP_RIGHT_DELAY) &&
+ new_endoff == RIGHT.br_startoff &&
+ new->br_startblock + new->br_blockcount == RIGHT.br_startblock &&
+ new->br_state == RIGHT.br_state &&
+ new->br_blockcount + RIGHT.br_blockcount <= XFS_MAX_BMBT_EXTLEN &&
+ ((state & (BMAP_LEFT_CONTIG | BMAP_LEFT_FILLING |
+ BMAP_RIGHT_FILLING)) !=
+ (BMAP_LEFT_CONTIG | BMAP_LEFT_FILLING |
+ BMAP_RIGHT_FILLING) ||
+ LEFT.br_blockcount + new->br_blockcount + RIGHT.br_blockcount
+ <= XFS_MAX_BMBT_EXTLEN))
+ state |= BMAP_RIGHT_CONTIG;
+
+ /*
+ * Switch out based on the FILLING and CONTIG state bits.
+ */
+ switch (state & (BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG |
+ BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG)) {
+ case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG |
+ BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
+ /*
+ * Setting all of a previous oldext extent to newext.
+ * The left and right neighbors are both contiguous with new.
+ */
+ LEFT.br_blockcount += PREV.br_blockcount + RIGHT.br_blockcount;
+
+ xfs_iext_remove(ip, icur, state);
+ xfs_iext_remove(ip, icur, state);
+ xfs_iext_prev(ifp, icur);
+ xfs_iext_update_extent(ip, state, icur, &LEFT);
+ ifp->if_nextents -= 2;
+ if (cur == NULL)
+ rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
+ else {
+ rval = XFS_ILOG_CORE;
+ error = xfs_bmbt_lookup_eq(cur, &RIGHT, &i);
+ if (error)
+ goto done;
+ if (XFS_IS_CORRUPT(mp, i != 1)) {
+ error = -EFSCORRUPTED;
+ goto done;
+ }
+ if ((error = xfs_btree_delete(cur, &i)))
+ goto done;
+ if (XFS_IS_CORRUPT(mp, i != 1)) {
+ error = -EFSCORRUPTED;
+ goto done;
+ }
+ if ((error = xfs_btree_decrement(cur, 0, &i)))
+ goto done;
+ if (XFS_IS_CORRUPT(mp, i != 1)) {
+ error = -EFSCORRUPTED;
+ goto done;
+ }
+ if ((error = xfs_btree_delete(cur, &i)))
+ goto done;
+ if (XFS_IS_CORRUPT(mp, i != 1)) {
+ error = -EFSCORRUPTED;
+ goto done;
+ }
+ if ((error = xfs_btree_decrement(cur, 0, &i)))
+ goto done;
+ if (XFS_IS_CORRUPT(mp, i != 1)) {
+ error = -EFSCORRUPTED;
+ goto done;
+ }
+ error = xfs_bmbt_update(cur, &LEFT);
+ if (error)
+ goto done;
+ }
+ break;
+
+ case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG:
+ /*
+ * Setting all of a previous oldext extent to newext.
+ * The left neighbor is contiguous, the right is not.
+ */
+ LEFT.br_blockcount += PREV.br_blockcount;
+
+ xfs_iext_remove(ip, icur, state);
+ xfs_iext_prev(ifp, icur);
+ xfs_iext_update_extent(ip, state, icur, &LEFT);
+ ifp->if_nextents--;
+ if (cur == NULL)
+ rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
+ else {
+ rval = XFS_ILOG_CORE;
+ error = xfs_bmbt_lookup_eq(cur, &PREV, &i);
+ if (error)
+ goto done;
+ if (XFS_IS_CORRUPT(mp, i != 1)) {
+ error = -EFSCORRUPTED;
+ goto done;
+ }
+ if ((error = xfs_btree_delete(cur, &i)))
+ goto done;
+ if (XFS_IS_CORRUPT(mp, i != 1)) {
+ error = -EFSCORRUPTED;
+ goto done;
+ }
+ if ((error = xfs_btree_decrement(cur, 0, &i)))
+ goto done;
+ if (XFS_IS_CORRUPT(mp, i != 1)) {
+ error = -EFSCORRUPTED;
+ goto done;
+ }
+ error = xfs_bmbt_update(cur, &LEFT);
+ if (error)
+ goto done;
+ }
+ break;
+
+ case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
+ /*
+ * Setting all of a previous oldext extent to newext.
+ * The right neighbor is contiguous, the left is not.
+ */
+ PREV.br_blockcount += RIGHT.br_blockcount;
+ PREV.br_state = new->br_state;
+
+ xfs_iext_next(ifp, icur);
+ xfs_iext_remove(ip, icur, state);
+ xfs_iext_prev(ifp, icur);
+ xfs_iext_update_extent(ip, state, icur, &PREV);
+ ifp->if_nextents--;
+
+ if (cur == NULL)
+ rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
+ else {
+ rval = XFS_ILOG_CORE;
+ error = xfs_bmbt_lookup_eq(cur, &RIGHT, &i);
+ if (error)
+ goto done;
+ if (XFS_IS_CORRUPT(mp, i != 1)) {
+ error = -EFSCORRUPTED;
+ goto done;
+ }
+ if ((error = xfs_btree_delete(cur, &i)))
+ goto done;
+ if (XFS_IS_CORRUPT(mp, i != 1)) {
+ error = -EFSCORRUPTED;
+ goto done;
+ }
+ if ((error = xfs_btree_decrement(cur, 0, &i)))
+ goto done;
+ if (XFS_IS_CORRUPT(mp, i != 1)) {
+ error = -EFSCORRUPTED;
+ goto done;
+ }
+ error = xfs_bmbt_update(cur, &PREV);
+ if (error)
+ goto done;
+ }
+ break;
+
+ case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING:
+ /*
+ * Setting all of a previous oldext extent to newext.
+ * Neither the left nor right neighbors are contiguous with
+ * the new one.
+ */
+ PREV.br_state = new->br_state;
+ xfs_iext_update_extent(ip, state, icur, &PREV);
+
+ if (cur == NULL)
+ rval = XFS_ILOG_DEXT;
+ else {
+ rval = 0;
+ error = xfs_bmbt_lookup_eq(cur, new, &i);
+ if (error)
+ goto done;
+ if (XFS_IS_CORRUPT(mp, i != 1)) {
+ error = -EFSCORRUPTED;
+ goto done;
+ }
+ error = xfs_bmbt_update(cur, &PREV);
+ if (error)
+ goto done;
+ }
+ break;
+
+ case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG:
+ /*
+ * Setting the first part of a previous oldext extent to newext.
+ * The left neighbor is contiguous.
+ */
+ LEFT.br_blockcount += new->br_blockcount;
+
+ old = PREV;
+ PREV.br_startoff += new->br_blockcount;
+ PREV.br_startblock += new->br_blockcount;
+ PREV.br_blockcount -= new->br_blockcount;
+
+ xfs_iext_update_extent(ip, state, icur, &PREV);
+ xfs_iext_prev(ifp, icur);
+ xfs_iext_update_extent(ip, state, icur, &LEFT);
+
+ if (cur == NULL)
+ rval = XFS_ILOG_DEXT;
+ else {
+ rval = 0;
+ error = xfs_bmbt_lookup_eq(cur, &old, &i);
+ if (error)
+ goto done;
+ if (XFS_IS_CORRUPT(mp, i != 1)) {
+ error = -EFSCORRUPTED;
+ goto done;
+ }
+ error = xfs_bmbt_update(cur, &PREV);
+ if (error)
+ goto done;
+ error = xfs_btree_decrement(cur, 0, &i);
+ if (error)
+ goto done;
+ error = xfs_bmbt_update(cur, &LEFT);
+ if (error)
+ goto done;
+ }
+ break;
+
+ case BMAP_LEFT_FILLING:
+ /*
+ * Setting the first part of a previous oldext extent to newext.
+ * The left neighbor is not contiguous.
+ */
+ old = PREV;
+ PREV.br_startoff += new->br_blockcount;
+ PREV.br_startblock += new->br_blockcount;
+ PREV.br_blockcount -= new->br_blockcount;
+
+ xfs_iext_update_extent(ip, state, icur, &PREV);
+ xfs_iext_insert(ip, icur, new, state);
+ ifp->if_nextents++;
+
+ if (cur == NULL)
+ rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
+ else {
+ rval = XFS_ILOG_CORE;
+ error = xfs_bmbt_lookup_eq(cur, &old, &i);
+ if (error)
+ goto done;
+ if (XFS_IS_CORRUPT(mp, i != 1)) {
+ error = -EFSCORRUPTED;
+ goto done;
+ }
+ error = xfs_bmbt_update(cur, &PREV);
+ if (error)
+ goto done;
+ cur->bc_rec.b = *new;
+ if ((error = xfs_btree_insert(cur, &i)))
+ goto done;
+ if (XFS_IS_CORRUPT(mp, i != 1)) {
+ error = -EFSCORRUPTED;
+ goto done;
+ }
+ }
+ break;
+
+ case BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
+ /*
+ * Setting the last part of a previous oldext extent to newext.
+ * The right neighbor is contiguous with the new allocation.
+ */
+ old = PREV;
+ PREV.br_blockcount -= new->br_blockcount;
+
+ RIGHT.br_startoff = new->br_startoff;
+ RIGHT.br_startblock = new->br_startblock;
+ RIGHT.br_blockcount += new->br_blockcount;
+
+ xfs_iext_update_extent(ip, state, icur, &PREV);
+ xfs_iext_next(ifp, icur);
+ xfs_iext_update_extent(ip, state, icur, &RIGHT);
+
+ if (cur == NULL)
+ rval = XFS_ILOG_DEXT;
+ else {
+ rval = 0;
+ error = xfs_bmbt_lookup_eq(cur, &old, &i);
+ if (error)
+ goto done;
+ if (XFS_IS_CORRUPT(mp, i != 1)) {
+ error = -EFSCORRUPTED;
+ goto done;
+ }
+ error = xfs_bmbt_update(cur, &PREV);
+ if (error)
+ goto done;
+ error = xfs_btree_increment(cur, 0, &i);
+ if (error)
+ goto done;
+ error = xfs_bmbt_update(cur, &RIGHT);
+ if (error)
+ goto done;
+ }
+ break;
+
+ case BMAP_RIGHT_FILLING:
+ /*
+ * Setting the last part of a previous oldext extent to newext.
+ * The right neighbor is not contiguous.
+ */
+ old = PREV;
+ PREV.br_blockcount -= new->br_blockcount;
+
+ xfs_iext_update_extent(ip, state, icur, &PREV);
+ xfs_iext_next(ifp, icur);
+ xfs_iext_insert(ip, icur, new, state);
+ ifp->if_nextents++;
+
+ if (cur == NULL)
+ rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
+ else {
+ rval = XFS_ILOG_CORE;
+ error = xfs_bmbt_lookup_eq(cur, &old, &i);
+ if (error)
+ goto done;
+ if (XFS_IS_CORRUPT(mp, i != 1)) {
+ error = -EFSCORRUPTED;
+ goto done;
+ }
+ error = xfs_bmbt_update(cur, &PREV);
+ if (error)
+ goto done;
+ error = xfs_bmbt_lookup_eq(cur, new, &i);
+ if (error)
+ goto done;
+ if (XFS_IS_CORRUPT(mp, i != 0)) {
+ error = -EFSCORRUPTED;
+ goto done;
+ }
+ if ((error = xfs_btree_insert(cur, &i)))
+ goto done;
+ if (XFS_IS_CORRUPT(mp, i != 1)) {
+ error = -EFSCORRUPTED;
+ goto done;
+ }
+ }
+ break;
+
+ case 0:
+ /*
+ * Setting the middle part of a previous oldext extent to
+ * newext. Contiguity is impossible here.
+ * One extent becomes three extents.
+ */
+ old = PREV;
+ PREV.br_blockcount = new->br_startoff - PREV.br_startoff;
+
+ r[0] = *new;
+ r[1].br_startoff = new_endoff;
+ r[1].br_blockcount =
+ old.br_startoff + old.br_blockcount - new_endoff;
+ r[1].br_startblock = new->br_startblock + new->br_blockcount;
+ r[1].br_state = PREV.br_state;
+
+ xfs_iext_update_extent(ip, state, icur, &PREV);
+ xfs_iext_next(ifp, icur);
+ xfs_iext_insert(ip, icur, &r[1], state);
+ xfs_iext_insert(ip, icur, &r[0], state);
+ ifp->if_nextents += 2;
+
+ if (cur == NULL)
+ rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
+ else {
+ rval = XFS_ILOG_CORE;
+ error = xfs_bmbt_lookup_eq(cur, &old, &i);
+ if (error)
+ goto done;
+ if (XFS_IS_CORRUPT(mp, i != 1)) {
+ error = -EFSCORRUPTED;
+ goto done;
+ }
+ /* new right extent - oldext */
+ error = xfs_bmbt_update(cur, &r[1]);
+ if (error)
+ goto done;
+ /* new left extent - oldext */
+ cur->bc_rec.b = PREV;
+ if ((error = xfs_btree_insert(cur, &i)))
+ goto done;
+ if (XFS_IS_CORRUPT(mp, i != 1)) {
+ error = -EFSCORRUPTED;
+ goto done;
+ }
+ /*
+ * Reset the cursor to the position of the new extent
+ * we are about to insert as we can't trust it after
+ * the previous insert.
+ */
+ error = xfs_bmbt_lookup_eq(cur, new, &i);
+ if (error)
+ goto done;
+ if (XFS_IS_CORRUPT(mp, i != 0)) {
+ error = -EFSCORRUPTED;
+ goto done;
+ }
+ /* new middle extent - newext */
+ if ((error = xfs_btree_insert(cur, &i)))
+ goto done;
+ if (XFS_IS_CORRUPT(mp, i != 1)) {
+ error = -EFSCORRUPTED;
+ goto done;
+ }
+ }
+ break;
+
+ case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
+ case BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
+ case BMAP_LEFT_FILLING | BMAP_RIGHT_CONTIG:
+ case BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG:
+ case BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
+ case BMAP_LEFT_CONTIG:
+ case BMAP_RIGHT_CONTIG:
+ /*
+ * These cases are all impossible.
+ */
+ ASSERT(0);
+ }
+
+ /* update reverse mappings */
+ xfs_rmap_convert_extent(mp, tp, ip, whichfork, new);
+
+ /* convert to a btree if necessary */
+ if (xfs_bmap_needs_btree(ip, whichfork)) {
+ int tmp_logflags; /* partial log flag return val */
+
+ ASSERT(cur == NULL);
+ error = xfs_bmap_extents_to_btree(tp, ip, &cur, 0,
+ &tmp_logflags, whichfork);
+ *logflagsp |= tmp_logflags;
+ if (error)
+ goto done;
+ }
+
+ /* clear out the allocated field, done with it now in any case. */
+ if (cur) {
+ cur->bc_ino.allocated = 0;
+ *curp = cur;
+ }
+
+ xfs_bmap_check_leaf_extents(*curp, ip, whichfork);
+done:
+ *logflagsp |= rval;
+ return error;
+#undef LEFT
+#undef RIGHT
+#undef PREV
+}
+
+/*
+ * Convert a hole to a delayed allocation.
+ */
+STATIC void
+xfs_bmap_add_extent_hole_delay(
+ xfs_inode_t *ip, /* incore inode pointer */
+ int whichfork,
+ struct xfs_iext_cursor *icur,
+ xfs_bmbt_irec_t *new) /* new data to add to file extents */
+{
+ struct xfs_ifork *ifp; /* inode fork pointer */
+ xfs_bmbt_irec_t left; /* left neighbor extent entry */
+ xfs_filblks_t newlen=0; /* new indirect size */
+ xfs_filblks_t oldlen=0; /* old indirect size */
+ xfs_bmbt_irec_t right; /* right neighbor extent entry */
+ uint32_t state = xfs_bmap_fork_to_state(whichfork);
+ xfs_filblks_t temp; /* temp for indirect calculations */
+
+ ifp = xfs_ifork_ptr(ip, whichfork);
+ ASSERT(isnullstartblock(new->br_startblock));
+
+ /*
+ * Check and set flags if this segment has a left neighbor
+ */
+ if (xfs_iext_peek_prev_extent(ifp, icur, &left)) {
+ state |= BMAP_LEFT_VALID;
+ if (isnullstartblock(left.br_startblock))
+ state |= BMAP_LEFT_DELAY;
+ }
+
+ /*
+ * Check and set flags if the current (right) segment exists.
+ * If it doesn't exist, we're converting the hole at end-of-file.
+ */
+ if (xfs_iext_get_extent(ifp, icur, &right)) {
+ state |= BMAP_RIGHT_VALID;
+ if (isnullstartblock(right.br_startblock))
+ state |= BMAP_RIGHT_DELAY;
+ }
+
+ /*
+ * Set contiguity flags on the left and right neighbors.
+ * Don't let extents get too large, even if the pieces are contiguous.
+ */
+ if ((state & BMAP_LEFT_VALID) && (state & BMAP_LEFT_DELAY) &&
+ left.br_startoff + left.br_blockcount == new->br_startoff &&
+ left.br_blockcount + new->br_blockcount <= XFS_MAX_BMBT_EXTLEN)
+ state |= BMAP_LEFT_CONTIG;
+
+ if ((state & BMAP_RIGHT_VALID) && (state & BMAP_RIGHT_DELAY) &&
+ new->br_startoff + new->br_blockcount == right.br_startoff &&
+ new->br_blockcount + right.br_blockcount <= XFS_MAX_BMBT_EXTLEN &&
+ (!(state & BMAP_LEFT_CONTIG) ||
+ (left.br_blockcount + new->br_blockcount +
+ right.br_blockcount <= XFS_MAX_BMBT_EXTLEN)))
+ state |= BMAP_RIGHT_CONTIG;
+
+ /*
+ * Switch out based on the contiguity flags.
+ */
+ switch (state & (BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG)) {
+ case BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
+ /*
+ * New allocation is contiguous with delayed allocations
+ * on the left and on the right.
+ * Merge all three into a single extent record.
+ */
+ temp = left.br_blockcount + new->br_blockcount +
+ right.br_blockcount;
+
+ oldlen = startblockval(left.br_startblock) +
+ startblockval(new->br_startblock) +
+ startblockval(right.br_startblock);
+ newlen = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
+ oldlen);
+ left.br_startblock = nullstartblock(newlen);
+ left.br_blockcount = temp;
+
+ xfs_iext_remove(ip, icur, state);
+ xfs_iext_prev(ifp, icur);
+ xfs_iext_update_extent(ip, state, icur, &left);
+ break;
+
+ case BMAP_LEFT_CONTIG:
+ /*
+ * New allocation is contiguous with a delayed allocation
+ * on the left.
+ * Merge the new allocation with the left neighbor.
+ */
+ temp = left.br_blockcount + new->br_blockcount;
+
+ oldlen = startblockval(left.br_startblock) +
+ startblockval(new->br_startblock);
+ newlen = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
+ oldlen);
+ left.br_blockcount = temp;
+ left.br_startblock = nullstartblock(newlen);
+
+ xfs_iext_prev(ifp, icur);
+ xfs_iext_update_extent(ip, state, icur, &left);
+ break;
+
+ case BMAP_RIGHT_CONTIG:
+ /*
+ * New allocation is contiguous with a delayed allocation
+ * on the right.
+ * Merge the new allocation with the right neighbor.
+ */
+ temp = new->br_blockcount + right.br_blockcount;
+ oldlen = startblockval(new->br_startblock) +
+ startblockval(right.br_startblock);
+ newlen = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
+ oldlen);
+ right.br_startoff = new->br_startoff;
+ right.br_startblock = nullstartblock(newlen);
+ right.br_blockcount = temp;
+ xfs_iext_update_extent(ip, state, icur, &right);
+ break;
+
+ case 0:
+ /*
+ * New allocation is not contiguous with another
+ * delayed allocation.
+ * Insert a new entry.
+ */
+ oldlen = newlen = 0;
+ xfs_iext_insert(ip, icur, new, state);
+ break;
+ }
+ if (oldlen != newlen) {
+ ASSERT(oldlen > newlen);
+ xfs_mod_fdblocks(ip->i_mount, (int64_t)(oldlen - newlen),
+ false);
+ /*
+ * Nothing to do for disk quota accounting here.
+ */
+ xfs_mod_delalloc(ip->i_mount, (int64_t)newlen - oldlen);
+ }
+}
+
+/*
+ * Convert a hole to a real allocation.
+ */
+STATIC int /* error */
+xfs_bmap_add_extent_hole_real(
+ struct xfs_trans *tp,
+ struct xfs_inode *ip,
+ int whichfork,
+ struct xfs_iext_cursor *icur,
+ struct xfs_btree_cur **curp,
+ struct xfs_bmbt_irec *new,
+ int *logflagsp,
+ uint32_t flags)
+{
+ struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork);
+ struct xfs_mount *mp = ip->i_mount;
+ struct xfs_btree_cur *cur = *curp;
+ int error; /* error return value */
+ int i; /* temp state */
+ xfs_bmbt_irec_t left; /* left neighbor extent entry */
+ xfs_bmbt_irec_t right; /* right neighbor extent entry */
+ int rval=0; /* return value (logging flags) */
+ uint32_t state = xfs_bmap_fork_to_state(whichfork);
+ struct xfs_bmbt_irec old;
+
+ ASSERT(!isnullstartblock(new->br_startblock));
+ ASSERT(!cur || !(cur->bc_ino.flags & XFS_BTCUR_BMBT_WASDEL));
+
+ XFS_STATS_INC(mp, xs_add_exlist);
+
+ /*
+ * Check and set flags if this segment has a left neighbor.
+ */
+ if (xfs_iext_peek_prev_extent(ifp, icur, &left)) {
+ state |= BMAP_LEFT_VALID;
+ if (isnullstartblock(left.br_startblock))
+ state |= BMAP_LEFT_DELAY;
+ }
+
+ /*
+ * Check and set flags if this segment has a current value.
+ * Not true if we're inserting into the "hole" at eof.
+ */
+ if (xfs_iext_get_extent(ifp, icur, &right)) {
+ state |= BMAP_RIGHT_VALID;
+ if (isnullstartblock(right.br_startblock))
+ state |= BMAP_RIGHT_DELAY;
+ }
+
+ /*
+ * We're inserting a real allocation between "left" and "right".
+ * Set the contiguity flags. Don't let extents get too large.
+ */
+ if ((state & BMAP_LEFT_VALID) && !(state & BMAP_LEFT_DELAY) &&
+ left.br_startoff + left.br_blockcount == new->br_startoff &&
+ left.br_startblock + left.br_blockcount == new->br_startblock &&
+ left.br_state == new->br_state &&
+ left.br_blockcount + new->br_blockcount <= XFS_MAX_BMBT_EXTLEN)
+ state |= BMAP_LEFT_CONTIG;
+
+ if ((state & BMAP_RIGHT_VALID) && !(state & BMAP_RIGHT_DELAY) &&
+ new->br_startoff + new->br_blockcount == right.br_startoff &&
+ new->br_startblock + new->br_blockcount == right.br_startblock &&
+ new->br_state == right.br_state &&
+ new->br_blockcount + right.br_blockcount <= XFS_MAX_BMBT_EXTLEN &&
+ (!(state & BMAP_LEFT_CONTIG) ||
+ left.br_blockcount + new->br_blockcount +
+ right.br_blockcount <= XFS_MAX_BMBT_EXTLEN))
+ state |= BMAP_RIGHT_CONTIG;
+
+ error = 0;
+ /*
+ * Select which case we're in here, and implement it.
+ */
+ switch (state & (BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG)) {
+ case BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
+ /*
+ * New allocation is contiguous with real allocations on the
+ * left and on the right.
+ * Merge all three into a single extent record.
+ */
+ left.br_blockcount += new->br_blockcount + right.br_blockcount;
+
+ xfs_iext_remove(ip, icur, state);
+ xfs_iext_prev(ifp, icur);
+ xfs_iext_update_extent(ip, state, icur, &left);
+ ifp->if_nextents--;
+
+ if (cur == NULL) {
+ rval = XFS_ILOG_CORE | xfs_ilog_fext(whichfork);
+ } else {
+ rval = XFS_ILOG_CORE;
+ error = xfs_bmbt_lookup_eq(cur, &right, &i);
+ if (error)
+ goto done;
+ if (XFS_IS_CORRUPT(mp, i != 1)) {
+ error = -EFSCORRUPTED;
+ goto done;
+ }
+ error = xfs_btree_delete(cur, &i);
+ if (error)
+ goto done;
+ if (XFS_IS_CORRUPT(mp, i != 1)) {
+ error = -EFSCORRUPTED;
+ goto done;
+ }
+ error = xfs_btree_decrement(cur, 0, &i);
+ if (error)
+ goto done;
+ if (XFS_IS_CORRUPT(mp, i != 1)) {
+ error = -EFSCORRUPTED;
+ goto done;
+ }
+ error = xfs_bmbt_update(cur, &left);
+ if (error)
+ goto done;
+ }
+ break;
+
+ case BMAP_LEFT_CONTIG:
+ /*
+ * New allocation is contiguous with a real allocation
+ * on the left.
+ * Merge the new allocation with the left neighbor.
+ */
+ old = left;
+ left.br_blockcount += new->br_blockcount;
+
+ xfs_iext_prev(ifp, icur);
+ xfs_iext_update_extent(ip, state, icur, &left);
+
+ if (cur == NULL) {
+ rval = xfs_ilog_fext(whichfork);
+ } else {
+ rval = 0;
+ error = xfs_bmbt_lookup_eq(cur, &old, &i);
+ if (error)
+ goto done;
+ if (XFS_IS_CORRUPT(mp, i != 1)) {
+ error = -EFSCORRUPTED;
+ goto done;
+ }
+ error = xfs_bmbt_update(cur, &left);
+ if (error)
+ goto done;
+ }
+ break;
+
+ case BMAP_RIGHT_CONTIG:
+ /*
+ * New allocation is contiguous with a real allocation
+ * on the right.
+ * Merge the new allocation with the right neighbor.
+ */
+ old = right;
+
+ right.br_startoff = new->br_startoff;
+ right.br_startblock = new->br_startblock;
+ right.br_blockcount += new->br_blockcount;
+ xfs_iext_update_extent(ip, state, icur, &right);
+
+ if (cur == NULL) {
+ rval = xfs_ilog_fext(whichfork);
+ } else {
+ rval = 0;
+ error = xfs_bmbt_lookup_eq(cur, &old, &i);
+ if (error)
+ goto done;
+ if (XFS_IS_CORRUPT(mp, i != 1)) {
+ error = -EFSCORRUPTED;
+ goto done;
+ }
+ error = xfs_bmbt_update(cur, &right);
+ if (error)
+ goto done;
+ }
+ break;
+
+ case 0:
+ /*
+ * New allocation is not contiguous with another
+ * real allocation.
+ * Insert a new entry.
+ */
+ xfs_iext_insert(ip, icur, new, state);
+ ifp->if_nextents++;
+
+ if (cur == NULL) {
+ rval = XFS_ILOG_CORE | xfs_ilog_fext(whichfork);
+ } else {
+ rval = XFS_ILOG_CORE;
+ error = xfs_bmbt_lookup_eq(cur, new, &i);
+ if (error)
+ goto done;
+ if (XFS_IS_CORRUPT(mp, i != 0)) {
+ error = -EFSCORRUPTED;
+ goto done;
+ }
+ error = xfs_btree_insert(cur, &i);
+ if (error)
+ goto done;
+ if (XFS_IS_CORRUPT(mp, i != 1)) {
+ error = -EFSCORRUPTED;
+ goto done;
+ }
+ }
+ break;
+ }
+
+ /* add reverse mapping unless caller opted out */
+ if (!(flags & XFS_BMAPI_NORMAP))
+ xfs_rmap_map_extent(tp, ip, whichfork, new);
+
+ /* convert to a btree if necessary */
+ if (xfs_bmap_needs_btree(ip, whichfork)) {
+ int tmp_logflags; /* partial log flag return val */
+
+ ASSERT(cur == NULL);
+ error = xfs_bmap_extents_to_btree(tp, ip, curp, 0,
+ &tmp_logflags, whichfork);
+ *logflagsp |= tmp_logflags;
+ cur = *curp;
+ if (error)
+ goto done;
+ }
+
+ /* clear out the allocated field, done with it now in any case. */
+ if (cur)
+ cur->bc_ino.allocated = 0;
+
+ xfs_bmap_check_leaf_extents(cur, ip, whichfork);
+done:
+ *logflagsp |= rval;
+ return error;
+}
+
+/*
+ * Functions used in the extent read, allocate and remove paths
+ */
+
+/*
+ * Adjust the size of the new extent based on i_extsize and rt extsize.
+ */
+int
+xfs_bmap_extsize_align(
+ xfs_mount_t *mp,
+ xfs_bmbt_irec_t *gotp, /* next extent pointer */
+ xfs_bmbt_irec_t *prevp, /* previous extent pointer */
+ xfs_extlen_t extsz, /* align to this extent size */
+ int rt, /* is this a realtime inode? */
+ int eof, /* is extent at end-of-file? */
+ int delay, /* creating delalloc extent? */
+ int convert, /* overwriting unwritten extent? */
+ xfs_fileoff_t *offp, /* in/out: aligned offset */
+ xfs_extlen_t *lenp) /* in/out: aligned length */
+{
+ xfs_fileoff_t orig_off; /* original offset */
+ xfs_extlen_t orig_alen; /* original length */
+ xfs_fileoff_t orig_end; /* original off+len */
+ xfs_fileoff_t nexto; /* next file offset */
+ xfs_fileoff_t prevo; /* previous file offset */
+ xfs_fileoff_t align_off; /* temp for offset */
+ xfs_extlen_t align_alen; /* temp for length */
+ xfs_extlen_t temp; /* temp for calculations */
+
+ if (convert)
+ return 0;
+
+ orig_off = align_off = *offp;
+ orig_alen = align_alen = *lenp;
+ orig_end = orig_off + orig_alen;
+
+ /*
+ * If this request overlaps an existing extent, then don't
+ * attempt to perform any additional alignment.
+ */
+ if (!delay && !eof &&
+ (orig_off >= gotp->br_startoff) &&
+ (orig_end <= gotp->br_startoff + gotp->br_blockcount)) {
+ return 0;
+ }
+
+ /*
+ * If the file offset is unaligned vs. the extent size
+ * we need to align it. This will be possible unless
+ * the file was previously written with a kernel that didn't
+ * perform this alignment, or if a truncate shot us in the
+ * foot.
+ */
+ div_u64_rem(orig_off, extsz, &temp);
+ if (temp) {
+ align_alen += temp;
+ align_off -= temp;
+ }
+
+ /* Same adjustment for the end of the requested area. */
+ temp = (align_alen % extsz);
+ if (temp)
+ align_alen += extsz - temp;
+
+ /*
+ * For large extent hint sizes, the aligned extent might be larger than
+ * XFS_BMBT_MAX_EXTLEN. In that case, reduce the size by an extsz so
+ * that it pulls the length back under XFS_BMBT_MAX_EXTLEN. The outer
+ * allocation loops handle short allocation just fine, so it is safe to
+ * do this. We only want to do it when we are forced to, though, because
+ * it means more allocation operations are required.
+ */
+ while (align_alen > XFS_MAX_BMBT_EXTLEN)
+ align_alen -= extsz;
+ ASSERT(align_alen <= XFS_MAX_BMBT_EXTLEN);
+
+ /*
+ * If the previous block overlaps with this proposed allocation
+ * then move the start forward without adjusting the length.
+ */
+ if (prevp->br_startoff != NULLFILEOFF) {
+ if (prevp->br_startblock == HOLESTARTBLOCK)
+ prevo = prevp->br_startoff;
+ else
+ prevo = prevp->br_startoff + prevp->br_blockcount;
+ } else
+ prevo = 0;
+ if (align_off != orig_off && align_off < prevo)
+ align_off = prevo;
+ /*
+ * If the next block overlaps with this proposed allocation
+ * then move the start back without adjusting the length,
+ * but not before offset 0.
+ * This may of course make the start overlap previous block,
+ * and if we hit the offset 0 limit then the next block
+ * can still overlap too.
+ */
+ if (!eof && gotp->br_startoff != NULLFILEOFF) {
+ if ((delay && gotp->br_startblock == HOLESTARTBLOCK) ||
+ (!delay && gotp->br_startblock == DELAYSTARTBLOCK))
+ nexto = gotp->br_startoff + gotp->br_blockcount;
+ else
+ nexto = gotp->br_startoff;
+ } else
+ nexto = NULLFILEOFF;
+ if (!eof &&
+ align_off + align_alen != orig_end &&
+ align_off + align_alen > nexto)
+ align_off = nexto > align_alen ? nexto - align_alen : 0;
+ /*
+ * If we're now overlapping the next or previous extent that
+ * means we can't fit an extsz piece in this hole. Just move
+ * the start forward to the first valid spot and set
+ * the length so we hit the end.
+ */
+ if (align_off != orig_off && align_off < prevo)
+ align_off = prevo;
+ if (align_off + align_alen != orig_end &&
+ align_off + align_alen > nexto &&
+ nexto != NULLFILEOFF) {
+ ASSERT(nexto > prevo);
+ align_alen = nexto - align_off;
+ }
+
+ /*
+ * If realtime, and the result isn't a multiple of the realtime
+ * extent size we need to remove blocks until it is.
+ */
+ if (rt && (temp = (align_alen % mp->m_sb.sb_rextsize))) {
+ /*
+ * We're not covering the original request, or
+ * we won't be able to once we fix the length.
+ */
+ if (orig_off < align_off ||
+ orig_end > align_off + align_alen ||
+ align_alen - temp < orig_alen)
+ return -EINVAL;
+ /*
+ * Try to fix it by moving the start up.
+ */
+ if (align_off + temp <= orig_off) {
+ align_alen -= temp;
+ align_off += temp;
+ }
+ /*
+ * Try to fix it by moving the end in.
+ */
+ else if (align_off + align_alen - temp >= orig_end)
+ align_alen -= temp;
+ /*
+ * Set the start to the minimum then trim the length.
+ */
+ else {
+ align_alen -= orig_off - align_off;
+ align_off = orig_off;
+ align_alen -= align_alen % mp->m_sb.sb_rextsize;
+ }
+ /*
+ * Result doesn't cover the request, fail it.
+ */
+ if (orig_off < align_off || orig_end > align_off + align_alen)
+ return -EINVAL;
+ } else {
+ ASSERT(orig_off >= align_off);
+ /* see XFS_BMBT_MAX_EXTLEN handling above */
+ ASSERT(orig_end <= align_off + align_alen ||
+ align_alen + extsz > XFS_MAX_BMBT_EXTLEN);
+ }
+
+#ifdef DEBUG
+ if (!eof && gotp->br_startoff != NULLFILEOFF)
+ ASSERT(align_off + align_alen <= gotp->br_startoff);
+ if (prevp->br_startoff != NULLFILEOFF)
+ ASSERT(align_off >= prevp->br_startoff + prevp->br_blockcount);
+#endif
+
+ *lenp = align_alen;
+ *offp = align_off;
+ return 0;
+}
+
+#define XFS_ALLOC_GAP_UNITS 4
+
+void
+xfs_bmap_adjacent(
+ struct xfs_bmalloca *ap) /* bmap alloc argument struct */
+{
+ xfs_fsblock_t adjust; /* adjustment to block numbers */
+ xfs_mount_t *mp; /* mount point structure */
+ int rt; /* true if inode is realtime */
+
+#define ISVALID(x,y) \
+ (rt ? \
+ (x) < mp->m_sb.sb_rblocks : \
+ XFS_FSB_TO_AGNO(mp, x) == XFS_FSB_TO_AGNO(mp, y) && \
+ XFS_FSB_TO_AGNO(mp, x) < mp->m_sb.sb_agcount && \
+ XFS_FSB_TO_AGBNO(mp, x) < mp->m_sb.sb_agblocks)
+
+ mp = ap->ip->i_mount;
+ rt = XFS_IS_REALTIME_INODE(ap->ip) &&
+ (ap->datatype & XFS_ALLOC_USERDATA);
+ /*
+ * If allocating at eof, and there's a previous real block,
+ * try to use its last block as our starting point.
+ */
+ if (ap->eof && ap->prev.br_startoff != NULLFILEOFF &&
+ !isnullstartblock(ap->prev.br_startblock) &&
+ ISVALID(ap->prev.br_startblock + ap->prev.br_blockcount,
+ ap->prev.br_startblock)) {
+ ap->blkno = ap->prev.br_startblock + ap->prev.br_blockcount;
+ /*
+ * Adjust for the gap between prevp and us.
+ */
+ adjust = ap->offset -
+ (ap->prev.br_startoff + ap->prev.br_blockcount);
+ if (adjust &&
+ ISVALID(ap->blkno + adjust, ap->prev.br_startblock))
+ ap->blkno += adjust;
+ }
+ /*
+ * If not at eof, then compare the two neighbor blocks.
+ * Figure out whether either one gives us a good starting point,
+ * and pick the better one.
+ */
+ else if (!ap->eof) {
+ xfs_fsblock_t gotbno; /* right side block number */
+ xfs_fsblock_t gotdiff=0; /* right side difference */
+ xfs_fsblock_t prevbno; /* left side block number */
+ xfs_fsblock_t prevdiff=0; /* left side difference */
+
+ /*
+ * If there's a previous (left) block, select a requested
+ * start block based on it.
+ */
+ if (ap->prev.br_startoff != NULLFILEOFF &&
+ !isnullstartblock(ap->prev.br_startblock) &&
+ (prevbno = ap->prev.br_startblock +
+ ap->prev.br_blockcount) &&
+ ISVALID(prevbno, ap->prev.br_startblock)) {
+ /*
+ * Calculate gap to end of previous block.
+ */
+ adjust = prevdiff = ap->offset -
+ (ap->prev.br_startoff +
+ ap->prev.br_blockcount);
+ /*
+ * Figure the startblock based on the previous block's
+ * end and the gap size.
+ * Heuristic!
+ * If the gap is large relative to the piece we're
+ * allocating, or using it gives us an invalid block
+ * number, then just use the end of the previous block.
+ */
+ if (prevdiff <= XFS_ALLOC_GAP_UNITS * ap->length &&
+ ISVALID(prevbno + prevdiff,
+ ap->prev.br_startblock))
+ prevbno += adjust;
+ else
+ prevdiff += adjust;
+ }
+ /*
+ * No previous block or can't follow it, just default.
+ */
+ else
+ prevbno = NULLFSBLOCK;
+ /*
+ * If there's a following (right) block, select a requested
+ * start block based on it.
+ */
+ if (!isnullstartblock(ap->got.br_startblock)) {
+ /*
+ * Calculate gap to start of next block.
+ */
+ adjust = gotdiff = ap->got.br_startoff - ap->offset;
+ /*
+ * Figure the startblock based on the next block's
+ * start and the gap size.
+ */
+ gotbno = ap->got.br_startblock;
+ /*
+ * Heuristic!
+ * If the gap is large relative to the piece we're
+ * allocating, or using it gives us an invalid block
+ * number, then just use the start of the next block
+ * offset by our length.
+ */
+ if (gotdiff <= XFS_ALLOC_GAP_UNITS * ap->length &&
+ ISVALID(gotbno - gotdiff, gotbno))
+ gotbno -= adjust;
+ else if (ISVALID(gotbno - ap->length, gotbno)) {
+ gotbno -= ap->length;
+ gotdiff += adjust - ap->length;
+ } else
+ gotdiff += adjust;
+ }
+ /*
+ * No next block, just default.
+ */
+ else
+ gotbno = NULLFSBLOCK;
+ /*
+ * If both valid, pick the better one, else the only good
+ * one, else ap->blkno is already set (to 0 or the inode block).
+ */
+ if (prevbno != NULLFSBLOCK && gotbno != NULLFSBLOCK)
+ ap->blkno = prevdiff <= gotdiff ? prevbno : gotbno;
+ else if (prevbno != NULLFSBLOCK)
+ ap->blkno = prevbno;
+ else if (gotbno != NULLFSBLOCK)
+ ap->blkno = gotbno;
+ }
+#undef ISVALID
+}
+
+int
+xfs_bmap_longest_free_extent(
+ struct xfs_perag *pag,
+ struct xfs_trans *tp,
+ xfs_extlen_t *blen)
+{
+ xfs_extlen_t longest;
+ int error = 0;
+
+ if (!xfs_perag_initialised_agf(pag)) {
+ error = xfs_alloc_read_agf(pag, tp, XFS_ALLOC_FLAG_TRYLOCK,
+ NULL);
+ if (error)
+ return error;
+ }
+
+ longest = xfs_alloc_longest_free_extent(pag,
+ xfs_alloc_min_freelist(pag->pag_mount, pag),
+ xfs_ag_resv_needed(pag, XFS_AG_RESV_NONE));
+ if (*blen < longest)
+ *blen = longest;
+
+ return 0;
+}
+
+static xfs_extlen_t
+xfs_bmap_select_minlen(
+ struct xfs_bmalloca *ap,
+ struct xfs_alloc_arg *args,
+ xfs_extlen_t blen)
+{
+
+ /*
+ * Since we used XFS_ALLOC_FLAG_TRYLOCK in _longest_free_extent(), it is
+ * possible that there is enough contiguous free space for this request.
+ */
+ if (blen < ap->minlen)
+ return ap->minlen;
+
+ /*
+ * If the best seen length is less than the request length,
+ * use the best as the minimum, otherwise we've got the maxlen we
+ * were asked for.
+ */
+ if (blen < args->maxlen)
+ return blen;
+ return args->maxlen;
+}
+
+static int
+xfs_bmap_btalloc_select_lengths(
+ struct xfs_bmalloca *ap,
+ struct xfs_alloc_arg *args,
+ xfs_extlen_t *blen)
+{
+ struct xfs_mount *mp = args->mp;
+ struct xfs_perag *pag;
+ xfs_agnumber_t agno, startag;
+ int error = 0;
+
+ if (ap->tp->t_flags & XFS_TRANS_LOWMODE) {
+ args->total = ap->minlen;
+ args->minlen = ap->minlen;
+ return 0;
+ }
+
+ args->total = ap->total;
+ startag = XFS_FSB_TO_AGNO(mp, ap->blkno);
+ if (startag == NULLAGNUMBER)
+ startag = 0;
+
+ *blen = 0;
+ for_each_perag_wrap(mp, startag, agno, pag) {
+ error = xfs_bmap_longest_free_extent(pag, args->tp, blen);
+ if (error && error != -EAGAIN)
+ break;
+ error = 0;
+ if (*blen >= args->maxlen)
+ break;
+ }
+ if (pag)
+ xfs_perag_rele(pag);
+
+ args->minlen = xfs_bmap_select_minlen(ap, args, *blen);
+ return error;
+}
+
+/* Update all inode and quota accounting for the allocation we just did. */
+static void
+xfs_bmap_btalloc_accounting(
+ struct xfs_bmalloca *ap,
+ struct xfs_alloc_arg *args)
+{
+ if (ap->flags & XFS_BMAPI_COWFORK) {
+ /*
+ * COW fork blocks are in-core only and thus are treated as
+ * in-core quota reservation (like delalloc blocks) even when
+ * converted to real blocks. The quota reservation is not
+ * accounted to disk until blocks are remapped to the data
+ * fork. So if these blocks were previously delalloc, we
+ * already have quota reservation and there's nothing to do
+ * yet.
+ */
+ if (ap->wasdel) {
+ xfs_mod_delalloc(ap->ip->i_mount, -(int64_t)args->len);
+ return;
+ }
+
+ /*
+ * Otherwise, we've allocated blocks in a hole. The transaction
+ * has acquired in-core quota reservation for this extent.
+ * Rather than account these as real blocks, however, we reduce
+ * the transaction quota reservation based on the allocation.
+ * This essentially transfers the transaction quota reservation
+ * to that of a delalloc extent.
+ */
+ ap->ip->i_delayed_blks += args->len;
+ xfs_trans_mod_dquot_byino(ap->tp, ap->ip, XFS_TRANS_DQ_RES_BLKS,
+ -(long)args->len);
+ return;
+ }
+
+ /* data/attr fork only */
+ ap->ip->i_nblocks += args->len;
+ xfs_trans_log_inode(ap->tp, ap->ip, XFS_ILOG_CORE);
+ if (ap->wasdel) {
+ ap->ip->i_delayed_blks -= args->len;
+ xfs_mod_delalloc(ap->ip->i_mount, -(int64_t)args->len);
+ }
+ xfs_trans_mod_dquot_byino(ap->tp, ap->ip,
+ ap->wasdel ? XFS_TRANS_DQ_DELBCOUNT : XFS_TRANS_DQ_BCOUNT,
+ args->len);
+}
+
+static int
+xfs_bmap_compute_alignments(
+ struct xfs_bmalloca *ap,
+ struct xfs_alloc_arg *args)
+{
+ struct xfs_mount *mp = args->mp;
+ xfs_extlen_t align = 0; /* minimum allocation alignment */
+ int stripe_align = 0;
+
+ /* stripe alignment for allocation is determined by mount parameters */
+ if (mp->m_swidth && xfs_has_swalloc(mp))
+ stripe_align = mp->m_swidth;
+ else if (mp->m_dalign)
+ stripe_align = mp->m_dalign;
+
+ if (ap->flags & XFS_BMAPI_COWFORK)
+ align = xfs_get_cowextsz_hint(ap->ip);
+ else if (ap->datatype & XFS_ALLOC_USERDATA)
+ align = xfs_get_extsz_hint(ap->ip);
+ if (align) {
+ if (xfs_bmap_extsize_align(mp, &ap->got, &ap->prev, align, 0,
+ ap->eof, 0, ap->conv, &ap->offset,
+ &ap->length))
+ ASSERT(0);
+ ASSERT(ap->length);
+ }
+
+ /* apply extent size hints if obtained earlier */
+ if (align) {
+ args->prod = align;
+ div_u64_rem(ap->offset, args->prod, &args->mod);
+ if (args->mod)
+ args->mod = args->prod - args->mod;
+ } else if (mp->m_sb.sb_blocksize >= PAGE_SIZE) {
+ args->prod = 1;
+ args->mod = 0;
+ } else {
+ args->prod = PAGE_SIZE >> mp->m_sb.sb_blocklog;
+ div_u64_rem(ap->offset, args->prod, &args->mod);
+ if (args->mod)
+ args->mod = args->prod - args->mod;
+ }
+
+ return stripe_align;
+}
+
+static void
+xfs_bmap_process_allocated_extent(
+ struct xfs_bmalloca *ap,
+ struct xfs_alloc_arg *args,
+ xfs_fileoff_t orig_offset,
+ xfs_extlen_t orig_length)
+{
+ ap->blkno = args->fsbno;
+ ap->length = args->len;
+ /*
+ * If the extent size hint is active, we tried to round the
+ * caller's allocation request offset down to extsz and the
+ * length up to another extsz boundary. If we found a free
+ * extent we mapped it in starting at this new offset. If the
+ * newly mapped space isn't long enough to cover any of the
+ * range of offsets that was originally requested, move the
+ * mapping up so that we can fill as much of the caller's
+ * original request as possible. Free space is apparently
+ * very fragmented so we're unlikely to be able to satisfy the
+ * hints anyway.
+ */
+ if (ap->length <= orig_length)
+ ap->offset = orig_offset;
+ else if (ap->offset + ap->length < orig_offset + orig_length)
+ ap->offset = orig_offset + orig_length - ap->length;
+ xfs_bmap_btalloc_accounting(ap, args);
+}
+
+#ifdef DEBUG
+static int
+xfs_bmap_exact_minlen_extent_alloc(
+ struct xfs_bmalloca *ap)
+{
+ struct xfs_mount *mp = ap->ip->i_mount;
+ struct xfs_alloc_arg args = { .tp = ap->tp, .mp = mp };
+ xfs_fileoff_t orig_offset;
+ xfs_extlen_t orig_length;
+ int error;
+
+ ASSERT(ap->length);
+
+ if (ap->minlen != 1) {
+ ap->blkno = NULLFSBLOCK;
+ ap->length = 0;
+ return 0;
+ }
+
+ orig_offset = ap->offset;
+ orig_length = ap->length;
+
+ args.alloc_minlen_only = 1;
+
+ xfs_bmap_compute_alignments(ap, &args);
+
+ /*
+ * Unlike the longest extent available in an AG, we don't track
+ * the length of an AG's shortest extent.
+ * XFS_ERRTAG_BMAP_ALLOC_MINLEN_EXTENT is a debug only knob and
+ * hence we can afford to start traversing from the 0th AG since
+ * we need not be concerned about a drop in performance in
+ * "debug only" code paths.
+ */
+ ap->blkno = XFS_AGB_TO_FSB(mp, 0, 0);
+
+ args.oinfo = XFS_RMAP_OINFO_SKIP_UPDATE;
+ args.minlen = args.maxlen = ap->minlen;
+ args.total = ap->total;
+
+ args.alignment = 1;
+ args.minalignslop = 0;
+
+ args.minleft = ap->minleft;
+ args.wasdel = ap->wasdel;
+ args.resv = XFS_AG_RESV_NONE;
+ args.datatype = ap->datatype;
+
+ error = xfs_alloc_vextent_first_ag(&args, ap->blkno);
+ if (error)
+ return error;
+
+ if (args.fsbno != NULLFSBLOCK) {
+ xfs_bmap_process_allocated_extent(ap, &args, orig_offset,
+ orig_length);
+ } else {
+ ap->blkno = NULLFSBLOCK;
+ ap->length = 0;
+ }
+
+ return 0;
+}
+#else
+
+#define xfs_bmap_exact_minlen_extent_alloc(bma) (-EFSCORRUPTED)
+
+#endif
+
+/*
+ * If we are not low on available data blocks and we are allocating at
+ * EOF, optimise allocation for contiguous file extension and/or stripe
+ * alignment of the new extent.
+ *
+ * NOTE: ap->aeof is only set if the allocation length is >= the
+ * stripe unit and the allocation offset is at the end of file.
+ */
+static int
+xfs_bmap_btalloc_at_eof(
+ struct xfs_bmalloca *ap,
+ struct xfs_alloc_arg *args,
+ xfs_extlen_t blen,
+ int stripe_align,
+ bool ag_only)
+{
+ struct xfs_mount *mp = args->mp;
+ struct xfs_perag *caller_pag = args->pag;
+ int error;
+
+ /*
+ * If there are already extents in the file, try an exact EOF block
+ * allocation to extend the file as a contiguous extent. If that fails,
+ * or it's the first allocation in a file, just try for a stripe aligned
+ * allocation.
+ */
+ if (ap->offset) {
+ xfs_extlen_t nextminlen = 0;
+
+ /*
+ * Compute the minlen+alignment for the next case. Set slop so
+ * that the value of minlen+alignment+slop doesn't go up between
+ * the calls.
+ */
+ args->alignment = 1;
+ if (blen > stripe_align && blen <= args->maxlen)
+ nextminlen = blen - stripe_align;
+ else
+ nextminlen = args->minlen;
+ if (nextminlen + stripe_align > args->minlen + 1)
+ args->minalignslop = nextminlen + stripe_align -
+ args->minlen - 1;
+ else
+ args->minalignslop = 0;
+
+ if (!caller_pag)
+ args->pag = xfs_perag_get(mp, XFS_FSB_TO_AGNO(mp, ap->blkno));
+ error = xfs_alloc_vextent_exact_bno(args, ap->blkno);
+ if (!caller_pag) {
+ xfs_perag_put(args->pag);
+ args->pag = NULL;
+ }
+ if (error)
+ return error;
+
+ if (args->fsbno != NULLFSBLOCK)
+ return 0;
+ /*
+ * Exact allocation failed. Reset to try an aligned allocation
+ * according to the original allocation specification.
+ */
+ args->alignment = stripe_align;
+ args->minlen = nextminlen;
+ args->minalignslop = 0;
+ } else {
+ /*
+ * Adjust minlen to try and preserve alignment if we
+ * can't guarantee an aligned maxlen extent.
+ */
+ args->alignment = stripe_align;
+ if (blen > args->alignment &&
+ blen <= args->maxlen + args->alignment)
+ args->minlen = blen - args->alignment;
+ args->minalignslop = 0;
+ }
+
+ if (ag_only) {
+ error = xfs_alloc_vextent_near_bno(args, ap->blkno);
+ } else {
+ args->pag = NULL;
+ error = xfs_alloc_vextent_start_ag(args, ap->blkno);
+ ASSERT(args->pag == NULL);
+ args->pag = caller_pag;
+ }
+ if (error)
+ return error;
+
+ if (args->fsbno != NULLFSBLOCK)
+ return 0;
+
+ /*
+ * Allocation failed, so turn return the allocation args to their
+ * original non-aligned state so the caller can proceed on allocation
+ * failure as if this function was never called.
+ */
+ args->alignment = 1;
+ return 0;
+}
+
+/*
+ * We have failed multiple allocation attempts so now are in a low space
+ * allocation situation. Try a locality first full filesystem minimum length
+ * allocation whilst still maintaining necessary total block reservation
+ * requirements.
+ *
+ * If that fails, we are now critically low on space, so perform a last resort
+ * allocation attempt: no reserve, no locality, blocking, minimum length, full
+ * filesystem free space scan. We also indicate to future allocations in this
+ * transaction that we are critically low on space so they don't waste time on
+ * allocation modes that are unlikely to succeed.
+ */
+int
+xfs_bmap_btalloc_low_space(
+ struct xfs_bmalloca *ap,
+ struct xfs_alloc_arg *args)
+{
+ int error;
+
+ if (args->minlen > ap->minlen) {
+ args->minlen = ap->minlen;
+ error = xfs_alloc_vextent_start_ag(args, ap->blkno);
+ if (error || args->fsbno != NULLFSBLOCK)
+ return error;
+ }
+
+ /* Last ditch attempt before failure is declared. */
+ args->total = ap->minlen;
+ error = xfs_alloc_vextent_first_ag(args, 0);
+ if (error)
+ return error;
+ ap->tp->t_flags |= XFS_TRANS_LOWMODE;
+ return 0;
+}
+
+static int
+xfs_bmap_btalloc_filestreams(
+ struct xfs_bmalloca *ap,
+ struct xfs_alloc_arg *args,
+ int stripe_align)
+{
+ xfs_extlen_t blen = 0;
+ int error = 0;
+
+
+ error = xfs_filestream_select_ag(ap, args, &blen);
+ if (error)
+ return error;
+ ASSERT(args->pag);
+
+ /*
+ * If we are in low space mode, then optimal allocation will fail so
+ * prepare for minimal allocation and jump to the low space algorithm
+ * immediately.
+ */
+ if (ap->tp->t_flags & XFS_TRANS_LOWMODE) {
+ args->minlen = ap->minlen;
+ ASSERT(args->fsbno == NULLFSBLOCK);
+ goto out_low_space;
+ }
+
+ args->minlen = xfs_bmap_select_minlen(ap, args, blen);
+ if (ap->aeof)
+ error = xfs_bmap_btalloc_at_eof(ap, args, blen, stripe_align,
+ true);
+
+ if (!error && args->fsbno == NULLFSBLOCK)
+ error = xfs_alloc_vextent_near_bno(args, ap->blkno);
+
+out_low_space:
+ /*
+ * We are now done with the perag reference for the filestreams
+ * association provided by xfs_filestream_select_ag(). Release it now as
+ * we've either succeeded, had a fatal error or we are out of space and
+ * need to do a full filesystem scan for free space which will take it's
+ * own references.
+ */
+ xfs_perag_rele(args->pag);
+ args->pag = NULL;
+ if (error || args->fsbno != NULLFSBLOCK)
+ return error;
+
+ return xfs_bmap_btalloc_low_space(ap, args);
+}
+
+static int
+xfs_bmap_btalloc_best_length(
+ struct xfs_bmalloca *ap,
+ struct xfs_alloc_arg *args,
+ int stripe_align)
+{
+ xfs_extlen_t blen = 0;
+ int error;
+
+ ap->blkno = XFS_INO_TO_FSB(args->mp, ap->ip->i_ino);
+ xfs_bmap_adjacent(ap);
+
+ /*
+ * Search for an allocation group with a single extent large enough for
+ * the request. If one isn't found, then adjust the minimum allocation
+ * size to the largest space found.
+ */
+ error = xfs_bmap_btalloc_select_lengths(ap, args, &blen);
+ if (error)
+ return error;
+
+ /*
+ * Don't attempt optimal EOF allocation if previous allocations barely
+ * succeeded due to being near ENOSPC. It is highly unlikely we'll get
+ * optimal or even aligned allocations in this case, so don't waste time
+ * trying.
+ */
+ if (ap->aeof && !(ap->tp->t_flags & XFS_TRANS_LOWMODE)) {
+ error = xfs_bmap_btalloc_at_eof(ap, args, blen, stripe_align,
+ false);
+ if (error || args->fsbno != NULLFSBLOCK)
+ return error;
+ }
+
+ error = xfs_alloc_vextent_start_ag(args, ap->blkno);
+ if (error || args->fsbno != NULLFSBLOCK)
+ return error;
+
+ return xfs_bmap_btalloc_low_space(ap, args);
+}
+
+static int
+xfs_bmap_btalloc(
+ struct xfs_bmalloca *ap)
+{
+ struct xfs_mount *mp = ap->ip->i_mount;
+ struct xfs_alloc_arg args = {
+ .tp = ap->tp,
+ .mp = mp,
+ .fsbno = NULLFSBLOCK,
+ .oinfo = XFS_RMAP_OINFO_SKIP_UPDATE,
+ .minleft = ap->minleft,
+ .wasdel = ap->wasdel,
+ .resv = XFS_AG_RESV_NONE,
+ .datatype = ap->datatype,
+ .alignment = 1,
+ .minalignslop = 0,
+ };
+ xfs_fileoff_t orig_offset;
+ xfs_extlen_t orig_length;
+ int error;
+ int stripe_align;
+
+ ASSERT(ap->length);
+ orig_offset = ap->offset;
+ orig_length = ap->length;
+
+ stripe_align = xfs_bmap_compute_alignments(ap, &args);
+
+ /* Trim the allocation back to the maximum an AG can fit. */
+ args.maxlen = min(ap->length, mp->m_ag_max_usable);
+
+ if ((ap->datatype & XFS_ALLOC_USERDATA) &&
+ xfs_inode_is_filestream(ap->ip))
+ error = xfs_bmap_btalloc_filestreams(ap, &args, stripe_align);
+ else
+ error = xfs_bmap_btalloc_best_length(ap, &args, stripe_align);
+ if (error)
+ return error;
+
+ if (args.fsbno != NULLFSBLOCK) {
+ xfs_bmap_process_allocated_extent(ap, &args, orig_offset,
+ orig_length);
+ } else {
+ ap->blkno = NULLFSBLOCK;
+ ap->length = 0;
+ }
+ return 0;
+}
+
+/* Trim extent to fit a logical block range. */
+void
+xfs_trim_extent(
+ struct xfs_bmbt_irec *irec,
+ xfs_fileoff_t bno,
+ xfs_filblks_t len)
+{
+ xfs_fileoff_t distance;
+ xfs_fileoff_t end = bno + len;
+
+ if (irec->br_startoff + irec->br_blockcount <= bno ||
+ irec->br_startoff >= end) {
+ irec->br_blockcount = 0;
+ return;
+ }
+
+ if (irec->br_startoff < bno) {
+ distance = bno - irec->br_startoff;
+ if (isnullstartblock(irec->br_startblock))
+ irec->br_startblock = DELAYSTARTBLOCK;
+ if (irec->br_startblock != DELAYSTARTBLOCK &&
+ irec->br_startblock != HOLESTARTBLOCK)
+ irec->br_startblock += distance;
+ irec->br_startoff += distance;
+ irec->br_blockcount -= distance;
+ }
+
+ if (end < irec->br_startoff + irec->br_blockcount) {
+ distance = irec->br_startoff + irec->br_blockcount - end;
+ irec->br_blockcount -= distance;
+ }
+}
+
+/*
+ * Trim the returned map to the required bounds
+ */
+STATIC void
+xfs_bmapi_trim_map(
+ struct xfs_bmbt_irec *mval,
+ struct xfs_bmbt_irec *got,
+ xfs_fileoff_t *bno,
+ xfs_filblks_t len,
+ xfs_fileoff_t obno,
+ xfs_fileoff_t end,
+ int n,
+ uint32_t flags)
+{
+ if ((flags & XFS_BMAPI_ENTIRE) ||
+ got->br_startoff + got->br_blockcount <= obno) {
+ *mval = *got;
+ if (isnullstartblock(got->br_startblock))
+ mval->br_startblock = DELAYSTARTBLOCK;
+ return;
+ }
+
+ if (obno > *bno)
+ *bno = obno;
+ ASSERT((*bno >= obno) || (n == 0));
+ ASSERT(*bno < end);
+ mval->br_startoff = *bno;
+ if (isnullstartblock(got->br_startblock))
+ mval->br_startblock = DELAYSTARTBLOCK;
+ else
+ mval->br_startblock = got->br_startblock +
+ (*bno - got->br_startoff);
+ /*
+ * Return the minimum of what we got and what we asked for for
+ * the length. We can use the len variable here because it is
+ * modified below and we could have been there before coming
+ * here if the first part of the allocation didn't overlap what
+ * was asked for.
+ */
+ mval->br_blockcount = XFS_FILBLKS_MIN(end - *bno,
+ got->br_blockcount - (*bno - got->br_startoff));
+ mval->br_state = got->br_state;
+ ASSERT(mval->br_blockcount <= len);
+ return;
+}
+
+/*
+ * Update and validate the extent map to return
+ */
+STATIC void
+xfs_bmapi_update_map(
+ struct xfs_bmbt_irec **map,
+ xfs_fileoff_t *bno,
+ xfs_filblks_t *len,
+ xfs_fileoff_t obno,
+ xfs_fileoff_t end,
+ int *n,
+ uint32_t flags)
+{
+ xfs_bmbt_irec_t *mval = *map;
+
+ ASSERT((flags & XFS_BMAPI_ENTIRE) ||
+ ((mval->br_startoff + mval->br_blockcount) <= end));
+ ASSERT((flags & XFS_BMAPI_ENTIRE) || (mval->br_blockcount <= *len) ||
+ (mval->br_startoff < obno));
+
+ *bno = mval->br_startoff + mval->br_blockcount;
+ *len = end - *bno;
+ if (*n > 0 && mval->br_startoff == mval[-1].br_startoff) {
+ /* update previous map with new information */
+ ASSERT(mval->br_startblock == mval[-1].br_startblock);
+ ASSERT(mval->br_blockcount > mval[-1].br_blockcount);
+ ASSERT(mval->br_state == mval[-1].br_state);
+ mval[-1].br_blockcount = mval->br_blockcount;
+ mval[-1].br_state = mval->br_state;
+ } else if (*n > 0 && mval->br_startblock != DELAYSTARTBLOCK &&
+ mval[-1].br_startblock != DELAYSTARTBLOCK &&
+ mval[-1].br_startblock != HOLESTARTBLOCK &&
+ mval->br_startblock == mval[-1].br_startblock +
+ mval[-1].br_blockcount &&
+ mval[-1].br_state == mval->br_state) {
+ ASSERT(mval->br_startoff ==
+ mval[-1].br_startoff + mval[-1].br_blockcount);
+ mval[-1].br_blockcount += mval->br_blockcount;
+ } else if (*n > 0 &&
+ mval->br_startblock == DELAYSTARTBLOCK &&
+ mval[-1].br_startblock == DELAYSTARTBLOCK &&
+ mval->br_startoff ==
+ mval[-1].br_startoff + mval[-1].br_blockcount) {
+ mval[-1].br_blockcount += mval->br_blockcount;
+ mval[-1].br_state = mval->br_state;
+ } else if (!((*n == 0) &&
+ ((mval->br_startoff + mval->br_blockcount) <=
+ obno))) {
+ mval++;
+ (*n)++;
+ }
+ *map = mval;
+}
+
+/*
+ * Map file blocks to filesystem blocks without allocation.
+ */
+int
+xfs_bmapi_read(
+ struct xfs_inode *ip,
+ xfs_fileoff_t bno,
+ xfs_filblks_t len,
+ struct xfs_bmbt_irec *mval,
+ int *nmap,
+ uint32_t flags)
+{
+ struct xfs_mount *mp = ip->i_mount;
+ int whichfork = xfs_bmapi_whichfork(flags);
+ struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork);
+ struct xfs_bmbt_irec got;
+ xfs_fileoff_t obno;
+ xfs_fileoff_t end;
+ struct xfs_iext_cursor icur;
+ int error;
+ bool eof = false;
+ int n = 0;
+
+ ASSERT(*nmap >= 1);
+ ASSERT(!(flags & ~(XFS_BMAPI_ATTRFORK | XFS_BMAPI_ENTIRE)));
+ ASSERT(xfs_isilocked(ip, XFS_ILOCK_SHARED|XFS_ILOCK_EXCL));
+
+ if (WARN_ON_ONCE(!ifp))
+ return -EFSCORRUPTED;
+
+ if (XFS_IS_CORRUPT(mp, !xfs_ifork_has_extents(ifp)) ||
+ XFS_TEST_ERROR(false, mp, XFS_ERRTAG_BMAPIFORMAT))
+ return -EFSCORRUPTED;
+
+ if (xfs_is_shutdown(mp))
+ return -EIO;
+
+ XFS_STATS_INC(mp, xs_blk_mapr);
+
+ error = xfs_iread_extents(NULL, ip, whichfork);
+ if (error)
+ return error;
+
+ if (!xfs_iext_lookup_extent(ip, ifp, bno, &icur, &got))
+ eof = true;
+ end = bno + len;
+ obno = bno;
+
+ while (bno < end && n < *nmap) {
+ /* Reading past eof, act as though there's a hole up to end. */
+ if (eof)
+ got.br_startoff = end;
+ if (got.br_startoff > bno) {
+ /* Reading in a hole. */
+ mval->br_startoff = bno;
+ mval->br_startblock = HOLESTARTBLOCK;
+ mval->br_blockcount =
+ XFS_FILBLKS_MIN(len, got.br_startoff - bno);
+ mval->br_state = XFS_EXT_NORM;
+ bno += mval->br_blockcount;
+ len -= mval->br_blockcount;
+ mval++;
+ n++;
+ continue;
+ }
+
+ /* set up the extent map to return. */
+ xfs_bmapi_trim_map(mval, &got, &bno, len, obno, end, n, flags);
+ xfs_bmapi_update_map(&mval, &bno, &len, obno, end, &n, flags);
+
+ /* If we're done, stop now. */
+ if (bno >= end || n >= *nmap)
+ break;
+
+ /* Else go on to the next record. */
+ if (!xfs_iext_next_extent(ifp, &icur, &got))
+ eof = true;
+ }
+ *nmap = n;
+ return 0;
+}
+
+/*
+ * Add a delayed allocation extent to an inode. Blocks are reserved from the
+ * global pool and the extent inserted into the inode in-core extent tree.
+ *
+ * On entry, got refers to the first extent beyond the offset of the extent to
+ * allocate or eof is specified if no such extent exists. On return, got refers
+ * to the extent record that was inserted to the inode fork.
+ *
+ * Note that the allocated extent may have been merged with contiguous extents
+ * during insertion into the inode fork. Thus, got does not reflect the current
+ * state of the inode fork on return. If necessary, the caller can use lastx to
+ * look up the updated record in the inode fork.
+ */
+int
+xfs_bmapi_reserve_delalloc(
+ struct xfs_inode *ip,
+ int whichfork,
+ xfs_fileoff_t off,
+ xfs_filblks_t len,
+ xfs_filblks_t prealloc,
+ struct xfs_bmbt_irec *got,
+ struct xfs_iext_cursor *icur,
+ int eof)
+{
+ struct xfs_mount *mp = ip->i_mount;
+ struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork);
+ xfs_extlen_t alen;
+ xfs_extlen_t indlen;
+ int error;
+ xfs_fileoff_t aoff = off;
+
+ /*
+ * Cap the alloc length. Keep track of prealloc so we know whether to
+ * tag the inode before we return.
+ */
+ alen = XFS_FILBLKS_MIN(len + prealloc, XFS_MAX_BMBT_EXTLEN);
+ if (!eof)
+ alen = XFS_FILBLKS_MIN(alen, got->br_startoff - aoff);
+ if (prealloc && alen >= len)
+ prealloc = alen - len;
+
+ /* Figure out the extent size, adjust alen */
+ if (whichfork == XFS_COW_FORK) {
+ struct xfs_bmbt_irec prev;
+ xfs_extlen_t extsz = xfs_get_cowextsz_hint(ip);
+
+ if (!xfs_iext_peek_prev_extent(ifp, icur, &prev))
+ prev.br_startoff = NULLFILEOFF;
+
+ error = xfs_bmap_extsize_align(mp, got, &prev, extsz, 0, eof,
+ 1, 0, &aoff, &alen);
+ ASSERT(!error);
+ }
+
+ /*
+ * Make a transaction-less quota reservation for delayed allocation
+ * blocks. This number gets adjusted later. We return if we haven't
+ * allocated blocks already inside this loop.
+ */
+ error = xfs_quota_reserve_blkres(ip, alen);
+ if (error)
+ return error;
+
+ /*
+ * Split changing sb for alen and indlen since they could be coming
+ * from different places.
+ */
+ indlen = (xfs_extlen_t)xfs_bmap_worst_indlen(ip, alen);
+ ASSERT(indlen > 0);
+
+ error = xfs_mod_fdblocks(mp, -((int64_t)alen), false);
+ if (error)
+ goto out_unreserve_quota;
+
+ error = xfs_mod_fdblocks(mp, -((int64_t)indlen), false);
+ if (error)
+ goto out_unreserve_blocks;
+
+
+ ip->i_delayed_blks += alen;
+ xfs_mod_delalloc(ip->i_mount, alen + indlen);
+
+ got->br_startoff = aoff;
+ got->br_startblock = nullstartblock(indlen);
+ got->br_blockcount = alen;
+ got->br_state = XFS_EXT_NORM;
+
+ xfs_bmap_add_extent_hole_delay(ip, whichfork, icur, got);
+
+ /*
+ * Tag the inode if blocks were preallocated. Note that COW fork
+ * preallocation can occur at the start or end of the extent, even when
+ * prealloc == 0, so we must also check the aligned offset and length.
+ */
+ if (whichfork == XFS_DATA_FORK && prealloc)
+ xfs_inode_set_eofblocks_tag(ip);
+ if (whichfork == XFS_COW_FORK && (prealloc || aoff < off || alen > len))
+ xfs_inode_set_cowblocks_tag(ip);
+
+ return 0;
+
+out_unreserve_blocks:
+ xfs_mod_fdblocks(mp, alen, false);
+out_unreserve_quota:
+ if (XFS_IS_QUOTA_ON(mp))
+ xfs_quota_unreserve_blkres(ip, alen);
+ return error;
+}
+
+static int
+xfs_bmap_alloc_userdata(
+ struct xfs_bmalloca *bma)
+{
+ struct xfs_mount *mp = bma->ip->i_mount;
+ int whichfork = xfs_bmapi_whichfork(bma->flags);
+ int error;
+
+ /*
+ * Set the data type being allocated. For the data fork, the first data
+ * in the file is treated differently to all other allocations. For the
+ * attribute fork, we only need to ensure the allocated range is not on
+ * the busy list.
+ */
+ bma->datatype = XFS_ALLOC_NOBUSY;
+ if (whichfork == XFS_DATA_FORK || whichfork == XFS_COW_FORK) {
+ bma->datatype |= XFS_ALLOC_USERDATA;
+ if (bma->offset == 0)
+ bma->datatype |= XFS_ALLOC_INITIAL_USER_DATA;
+
+ if (mp->m_dalign && bma->length >= mp->m_dalign) {
+ error = xfs_bmap_isaeof(bma, whichfork);
+ if (error)
+ return error;
+ }
+
+ if (XFS_IS_REALTIME_INODE(bma->ip))
+ return xfs_bmap_rtalloc(bma);
+ }
+
+ if (unlikely(XFS_TEST_ERROR(false, mp,
+ XFS_ERRTAG_BMAP_ALLOC_MINLEN_EXTENT)))
+ return xfs_bmap_exact_minlen_extent_alloc(bma);
+
+ return xfs_bmap_btalloc(bma);
+}
+
+static int
+xfs_bmapi_allocate(
+ struct xfs_bmalloca *bma)
+{
+ struct xfs_mount *mp = bma->ip->i_mount;
+ int whichfork = xfs_bmapi_whichfork(bma->flags);
+ struct xfs_ifork *ifp = xfs_ifork_ptr(bma->ip, whichfork);
+ int tmp_logflags = 0;
+ int error;
+
+ ASSERT(bma->length > 0);
+
+ /*
+ * For the wasdelay case, we could also just allocate the stuff asked
+ * for in this bmap call but that wouldn't be as good.
+ */
+ if (bma->wasdel) {
+ bma->length = (xfs_extlen_t)bma->got.br_blockcount;
+ bma->offset = bma->got.br_startoff;
+ if (!xfs_iext_peek_prev_extent(ifp, &bma->icur, &bma->prev))
+ bma->prev.br_startoff = NULLFILEOFF;
+ } else {
+ bma->length = XFS_FILBLKS_MIN(bma->length, XFS_MAX_BMBT_EXTLEN);
+ if (!bma->eof)
+ bma->length = XFS_FILBLKS_MIN(bma->length,
+ bma->got.br_startoff - bma->offset);
+ }
+
+ if (bma->flags & XFS_BMAPI_CONTIG)
+ bma->minlen = bma->length;
+ else
+ bma->minlen = 1;
+
+ if (bma->flags & XFS_BMAPI_METADATA) {
+ if (unlikely(XFS_TEST_ERROR(false, mp,
+ XFS_ERRTAG_BMAP_ALLOC_MINLEN_EXTENT)))
+ error = xfs_bmap_exact_minlen_extent_alloc(bma);
+ else
+ error = xfs_bmap_btalloc(bma);
+ } else {
+ error = xfs_bmap_alloc_userdata(bma);
+ }
+ if (error || bma->blkno == NULLFSBLOCK)
+ return error;
+
+ if (bma->flags & XFS_BMAPI_ZERO) {
+ error = xfs_zero_extent(bma->ip, bma->blkno, bma->length);
+ if (error)
+ return error;
+ }
+
+ if (ifp->if_format == XFS_DINODE_FMT_BTREE && !bma->cur)
+ bma->cur = xfs_bmbt_init_cursor(mp, bma->tp, bma->ip, whichfork);
+ /*
+ * Bump the number of extents we've allocated
+ * in this call.
+ */
+ bma->nallocs++;
+
+ if (bma->cur)
+ bma->cur->bc_ino.flags =
+ bma->wasdel ? XFS_BTCUR_BMBT_WASDEL : 0;
+
+ bma->got.br_startoff = bma->offset;
+ bma->got.br_startblock = bma->blkno;
+ bma->got.br_blockcount = bma->length;
+ bma->got.br_state = XFS_EXT_NORM;
+
+ if (bma->flags & XFS_BMAPI_PREALLOC)
+ bma->got.br_state = XFS_EXT_UNWRITTEN;
+
+ if (bma->wasdel)
+ error = xfs_bmap_add_extent_delay_real(bma, whichfork);
+ else
+ error = xfs_bmap_add_extent_hole_real(bma->tp, bma->ip,
+ whichfork, &bma->icur, &bma->cur, &bma->got,
+ &bma->logflags, bma->flags);
+
+ bma->logflags |= tmp_logflags;
+ if (error)
+ return error;
+
+ /*
+ * Update our extent pointer, given that xfs_bmap_add_extent_delay_real
+ * or xfs_bmap_add_extent_hole_real might have merged it into one of
+ * the neighbouring ones.
+ */
+ xfs_iext_get_extent(ifp, &bma->icur, &bma->got);
+
+ ASSERT(bma->got.br_startoff <= bma->offset);
+ ASSERT(bma->got.br_startoff + bma->got.br_blockcount >=
+ bma->offset + bma->length);
+ ASSERT(bma->got.br_state == XFS_EXT_NORM ||
+ bma->got.br_state == XFS_EXT_UNWRITTEN);
+ return 0;
+}
+
+STATIC int
+xfs_bmapi_convert_unwritten(
+ struct xfs_bmalloca *bma,
+ struct xfs_bmbt_irec *mval,
+ xfs_filblks_t len,
+ uint32_t flags)
+{
+ int whichfork = xfs_bmapi_whichfork(flags);
+ struct xfs_ifork *ifp = xfs_ifork_ptr(bma->ip, whichfork);
+ int tmp_logflags = 0;
+ int error;
+
+ /* check if we need to do unwritten->real conversion */
+ if (mval->br_state == XFS_EXT_UNWRITTEN &&
+ (flags & XFS_BMAPI_PREALLOC))
+ return 0;
+
+ /* check if we need to do real->unwritten conversion */
+ if (mval->br_state == XFS_EXT_NORM &&
+ (flags & (XFS_BMAPI_PREALLOC | XFS_BMAPI_CONVERT)) !=
+ (XFS_BMAPI_PREALLOC | XFS_BMAPI_CONVERT))
+ return 0;
+
+ /*
+ * Modify (by adding) the state flag, if writing.
+ */
+ ASSERT(mval->br_blockcount <= len);
+ if (ifp->if_format == XFS_DINODE_FMT_BTREE && !bma->cur) {
+ bma->cur = xfs_bmbt_init_cursor(bma->ip->i_mount, bma->tp,
+ bma->ip, whichfork);
+ }
+ mval->br_state = (mval->br_state == XFS_EXT_UNWRITTEN)
+ ? XFS_EXT_NORM : XFS_EXT_UNWRITTEN;
+
+ /*
+ * Before insertion into the bmbt, zero the range being converted
+ * if required.
+ */
+ if (flags & XFS_BMAPI_ZERO) {
+ error = xfs_zero_extent(bma->ip, mval->br_startblock,
+ mval->br_blockcount);
+ if (error)
+ return error;
+ }
+
+ error = xfs_bmap_add_extent_unwritten_real(bma->tp, bma->ip, whichfork,
+ &bma->icur, &bma->cur, mval, &tmp_logflags);
+ /*
+ * Log the inode core unconditionally in the unwritten extent conversion
+ * path because the conversion might not have done so (e.g., if the
+ * extent count hasn't changed). We need to make sure the inode is dirty
+ * in the transaction for the sake of fsync(), even if nothing has
+ * changed, because fsync() will not force the log for this transaction
+ * unless it sees the inode pinned.
+ *
+ * Note: If we're only converting cow fork extents, there aren't
+ * any on-disk updates to make, so we don't need to log anything.
+ */
+ if (whichfork != XFS_COW_FORK)
+ bma->logflags |= tmp_logflags | XFS_ILOG_CORE;
+ if (error)
+ return error;
+
+ /*
+ * Update our extent pointer, given that
+ * xfs_bmap_add_extent_unwritten_real might have merged it into one
+ * of the neighbouring ones.
+ */
+ xfs_iext_get_extent(ifp, &bma->icur, &bma->got);
+
+ /*
+ * We may have combined previously unwritten space with written space,
+ * so generate another request.
+ */
+ if (mval->br_blockcount < len)
+ return -EAGAIN;
+ return 0;
+}
+
+xfs_extlen_t
+xfs_bmapi_minleft(
+ struct xfs_trans *tp,
+ struct xfs_inode *ip,
+ int fork)
+{
+ struct xfs_ifork *ifp = xfs_ifork_ptr(ip, fork);
+
+ if (tp && tp->t_highest_agno != NULLAGNUMBER)
+ return 0;
+ if (ifp->if_format != XFS_DINODE_FMT_BTREE)
+ return 1;
+ return be16_to_cpu(ifp->if_broot->bb_level) + 1;
+}
+
+/*
+ * Log whatever the flags say, even if error. Otherwise we might miss detecting
+ * a case where the data is changed, there's an error, and it's not logged so we
+ * don't shutdown when we should. Don't bother logging extents/btree changes if
+ * we converted to the other format.
+ */
+static void
+xfs_bmapi_finish(
+ struct xfs_bmalloca *bma,
+ int whichfork,
+ int error)
+{
+ struct xfs_ifork *ifp = xfs_ifork_ptr(bma->ip, whichfork);
+
+ if ((bma->logflags & xfs_ilog_fext(whichfork)) &&
+ ifp->if_format != XFS_DINODE_FMT_EXTENTS)
+ bma->logflags &= ~xfs_ilog_fext(whichfork);
+ else if ((bma->logflags & xfs_ilog_fbroot(whichfork)) &&
+ ifp->if_format != XFS_DINODE_FMT_BTREE)
+ bma->logflags &= ~xfs_ilog_fbroot(whichfork);
+
+ if (bma->logflags)
+ xfs_trans_log_inode(bma->tp, bma->ip, bma->logflags);
+ if (bma->cur)
+ xfs_btree_del_cursor(bma->cur, error);
+}
+
+/*
+ * Map file blocks to filesystem blocks, and allocate blocks or convert the
+ * extent state if necessary. Details behaviour is controlled by the flags
+ * parameter. Only allocates blocks from a single allocation group, to avoid
+ * locking problems.
+ */
+int
+xfs_bmapi_write(
+ struct xfs_trans *tp, /* transaction pointer */
+ struct xfs_inode *ip, /* incore inode */
+ xfs_fileoff_t bno, /* starting file offs. mapped */
+ xfs_filblks_t len, /* length to map in file */
+ uint32_t flags, /* XFS_BMAPI_... */
+ xfs_extlen_t total, /* total blocks needed */
+ struct xfs_bmbt_irec *mval, /* output: map values */
+ int *nmap) /* i/o: mval size/count */
+{
+ struct xfs_bmalloca bma = {
+ .tp = tp,
+ .ip = ip,
+ .total = total,
+ };
+ struct xfs_mount *mp = ip->i_mount;
+ int whichfork = xfs_bmapi_whichfork(flags);
+ struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork);
+ xfs_fileoff_t end; /* end of mapped file region */
+ bool eof = false; /* after the end of extents */
+ int error; /* error return */
+ int n; /* current extent index */
+ xfs_fileoff_t obno; /* old block number (offset) */
+
+#ifdef DEBUG
+ xfs_fileoff_t orig_bno; /* original block number value */
+ int orig_flags; /* original flags arg value */
+ xfs_filblks_t orig_len; /* original value of len arg */
+ struct xfs_bmbt_irec *orig_mval; /* original value of mval */
+ int orig_nmap; /* original value of *nmap */
+
+ orig_bno = bno;
+ orig_len = len;
+ orig_flags = flags;
+ orig_mval = mval;
+ orig_nmap = *nmap;
+#endif
+
+ ASSERT(*nmap >= 1);
+ ASSERT(*nmap <= XFS_BMAP_MAX_NMAP);
+ ASSERT(tp != NULL);
+ ASSERT(len > 0);
+ ASSERT(ifp->if_format != XFS_DINODE_FMT_LOCAL);
+ ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
+ ASSERT(!(flags & XFS_BMAPI_REMAP));
+
+ /* zeroing is for currently only for data extents, not metadata */
+ ASSERT((flags & (XFS_BMAPI_METADATA | XFS_BMAPI_ZERO)) !=
+ (XFS_BMAPI_METADATA | XFS_BMAPI_ZERO));
+ /*
+ * we can allocate unwritten extents or pre-zero allocated blocks,
+ * but it makes no sense to do both at once. This would result in
+ * zeroing the unwritten extent twice, but it still being an
+ * unwritten extent....
+ */
+ ASSERT((flags & (XFS_BMAPI_PREALLOC | XFS_BMAPI_ZERO)) !=
+ (XFS_BMAPI_PREALLOC | XFS_BMAPI_ZERO));
+
+ if (XFS_IS_CORRUPT(mp, !xfs_ifork_has_extents(ifp)) ||
+ XFS_TEST_ERROR(false, mp, XFS_ERRTAG_BMAPIFORMAT)) {
+ return -EFSCORRUPTED;
+ }
+
+ if (xfs_is_shutdown(mp))
+ return -EIO;
+
+ XFS_STATS_INC(mp, xs_blk_mapw);
+
+ error = xfs_iread_extents(tp, ip, whichfork);
+ if (error)
+ goto error0;
+
+ if (!xfs_iext_lookup_extent(ip, ifp, bno, &bma.icur, &bma.got))
+ eof = true;
+ if (!xfs_iext_peek_prev_extent(ifp, &bma.icur, &bma.prev))
+ bma.prev.br_startoff = NULLFILEOFF;
+ bma.minleft = xfs_bmapi_minleft(tp, ip, whichfork);
+
+ n = 0;
+ end = bno + len;
+ obno = bno;
+ while (bno < end && n < *nmap) {
+ bool need_alloc = false, wasdelay = false;
+
+ /* in hole or beyond EOF? */
+ if (eof || bma.got.br_startoff > bno) {
+ /*
+ * CoW fork conversions should /never/ hit EOF or
+ * holes. There should always be something for us
+ * to work on.
+ */
+ ASSERT(!((flags & XFS_BMAPI_CONVERT) &&
+ (flags & XFS_BMAPI_COWFORK)));
+
+ need_alloc = true;
+ } else if (isnullstartblock(bma.got.br_startblock)) {
+ wasdelay = true;
+ }
+
+ /*
+ * First, deal with the hole before the allocated space
+ * that we found, if any.
+ */
+ if (need_alloc || wasdelay) {
+ bma.eof = eof;
+ bma.conv = !!(flags & XFS_BMAPI_CONVERT);
+ bma.wasdel = wasdelay;
+ bma.offset = bno;
+ bma.flags = flags;
+
+ /*
+ * There's a 32/64 bit type mismatch between the
+ * allocation length request (which can be 64 bits in
+ * length) and the bma length request, which is
+ * xfs_extlen_t and therefore 32 bits. Hence we have to
+ * check for 32-bit overflows and handle them here.
+ */
+ if (len > (xfs_filblks_t)XFS_MAX_BMBT_EXTLEN)
+ bma.length = XFS_MAX_BMBT_EXTLEN;
+ else
+ bma.length = len;
+
+ ASSERT(len > 0);
+ ASSERT(bma.length > 0);
+ error = xfs_bmapi_allocate(&bma);
+ if (error)
+ goto error0;
+ if (bma.blkno == NULLFSBLOCK)
+ break;
+
+ /*
+ * If this is a CoW allocation, record the data in
+ * the refcount btree for orphan recovery.
+ */
+ if (whichfork == XFS_COW_FORK)
+ xfs_refcount_alloc_cow_extent(tp, bma.blkno,
+ bma.length);
+ }
+
+ /* Deal with the allocated space we found. */
+ xfs_bmapi_trim_map(mval, &bma.got, &bno, len, obno,
+ end, n, flags);
+
+ /* Execute unwritten extent conversion if necessary */
+ error = xfs_bmapi_convert_unwritten(&bma, mval, len, flags);
+ if (error == -EAGAIN)
+ continue;
+ if (error)
+ goto error0;
+
+ /* update the extent map to return */
+ xfs_bmapi_update_map(&mval, &bno, &len, obno, end, &n, flags);
+
+ /*
+ * If we're done, stop now. Stop when we've allocated
+ * XFS_BMAP_MAX_NMAP extents no matter what. Otherwise
+ * the transaction may get too big.
+ */
+ if (bno >= end || n >= *nmap || bma.nallocs >= *nmap)
+ break;
+
+ /* Else go on to the next record. */
+ bma.prev = bma.got;
+ if (!xfs_iext_next_extent(ifp, &bma.icur, &bma.got))
+ eof = true;
+ }
+ *nmap = n;
+
+ error = xfs_bmap_btree_to_extents(tp, ip, bma.cur, &bma.logflags,
+ whichfork);
+ if (error)
+ goto error0;
+
+ ASSERT(ifp->if_format != XFS_DINODE_FMT_BTREE ||
+ ifp->if_nextents > XFS_IFORK_MAXEXT(ip, whichfork));
+ xfs_bmapi_finish(&bma, whichfork, 0);
+ xfs_bmap_validate_ret(orig_bno, orig_len, orig_flags, orig_mval,
+ orig_nmap, *nmap);
+ return 0;
+error0:
+ xfs_bmapi_finish(&bma, whichfork, error);
+ return error;
+}
+
+/*
+ * Convert an existing delalloc extent to real blocks based on file offset. This
+ * attempts to allocate the entire delalloc extent and may require multiple
+ * invocations to allocate the target offset if a large enough physical extent
+ * is not available.
+ */
+int
+xfs_bmapi_convert_delalloc(
+ struct xfs_inode *ip,
+ int whichfork,
+ xfs_off_t offset,
+ struct iomap *iomap,
+ unsigned int *seq)
+{
+ struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork);
+ struct xfs_mount *mp = ip->i_mount;
+ xfs_fileoff_t offset_fsb = XFS_B_TO_FSBT(mp, offset);
+ struct xfs_bmalloca bma = { NULL };
+ uint16_t flags = 0;
+ struct xfs_trans *tp;
+ int error;
+
+ if (whichfork == XFS_COW_FORK)
+ flags |= IOMAP_F_SHARED;
+
+ /*
+ * Space for the extent and indirect blocks was reserved when the
+ * delalloc extent was created so there's no need to do so here.
+ */
+ error = xfs_trans_alloc(mp, &M_RES(mp)->tr_write, 0, 0,
+ XFS_TRANS_RESERVE, &tp);
+ if (error)
+ return error;
+
+ xfs_ilock(ip, XFS_ILOCK_EXCL);
+ xfs_trans_ijoin(tp, ip, 0);
+
+ error = xfs_iext_count_may_overflow(ip, whichfork,
+ XFS_IEXT_ADD_NOSPLIT_CNT);
+ if (error == -EFBIG)
+ error = xfs_iext_count_upgrade(tp, ip,
+ XFS_IEXT_ADD_NOSPLIT_CNT);
+ if (error)
+ goto out_trans_cancel;
+
+ if (!xfs_iext_lookup_extent(ip, ifp, offset_fsb, &bma.icur, &bma.got) ||
+ bma.got.br_startoff > offset_fsb) {
+ /*
+ * No extent found in the range we are trying to convert. This
+ * should only happen for the COW fork, where another thread
+ * might have moved the extent to the data fork in the meantime.
+ */
+ WARN_ON_ONCE(whichfork != XFS_COW_FORK);
+ error = -EAGAIN;
+ goto out_trans_cancel;
+ }
+
+ /*
+ * If we find a real extent here we raced with another thread converting
+ * the extent. Just return the real extent at this offset.
+ */
+ if (!isnullstartblock(bma.got.br_startblock)) {
+ xfs_bmbt_to_iomap(ip, iomap, &bma.got, 0, flags,
+ xfs_iomap_inode_sequence(ip, flags));
+ *seq = READ_ONCE(ifp->if_seq);
+ goto out_trans_cancel;
+ }
+
+ bma.tp = tp;
+ bma.ip = ip;
+ bma.wasdel = true;
+ bma.offset = bma.got.br_startoff;
+ bma.length = max_t(xfs_filblks_t, bma.got.br_blockcount,
+ XFS_MAX_BMBT_EXTLEN);
+ bma.minleft = xfs_bmapi_minleft(tp, ip, whichfork);
+
+ /*
+ * When we're converting the delalloc reservations backing dirty pages
+ * in the page cache, we must be careful about how we create the new
+ * extents:
+ *
+ * New CoW fork extents are created unwritten, turned into real extents
+ * when we're about to write the data to disk, and mapped into the data
+ * fork after the write finishes. End of story.
+ *
+ * New data fork extents must be mapped in as unwritten and converted
+ * to real extents after the write succeeds to avoid exposing stale
+ * disk contents if we crash.
+ */
+ bma.flags = XFS_BMAPI_PREALLOC;
+ if (whichfork == XFS_COW_FORK)
+ bma.flags |= XFS_BMAPI_COWFORK;
+
+ if (!xfs_iext_peek_prev_extent(ifp, &bma.icur, &bma.prev))
+ bma.prev.br_startoff = NULLFILEOFF;
+
+ error = xfs_bmapi_allocate(&bma);
+ if (error)
+ goto out_finish;
+
+ error = -ENOSPC;
+ if (WARN_ON_ONCE(bma.blkno == NULLFSBLOCK))
+ goto out_finish;
+ error = -EFSCORRUPTED;
+ if (WARN_ON_ONCE(!xfs_valid_startblock(ip, bma.got.br_startblock)))
+ goto out_finish;
+
+ XFS_STATS_ADD(mp, xs_xstrat_bytes, XFS_FSB_TO_B(mp, bma.length));
+ XFS_STATS_INC(mp, xs_xstrat_quick);
+
+ ASSERT(!isnullstartblock(bma.got.br_startblock));
+ xfs_bmbt_to_iomap(ip, iomap, &bma.got, 0, flags,
+ xfs_iomap_inode_sequence(ip, flags));
+ *seq = READ_ONCE(ifp->if_seq);
+
+ if (whichfork == XFS_COW_FORK)
+ xfs_refcount_alloc_cow_extent(tp, bma.blkno, bma.length);
+
+ error = xfs_bmap_btree_to_extents(tp, ip, bma.cur, &bma.logflags,
+ whichfork);
+ if (error)
+ goto out_finish;
+
+ xfs_bmapi_finish(&bma, whichfork, 0);
+ error = xfs_trans_commit(tp);
+ xfs_iunlock(ip, XFS_ILOCK_EXCL);
+ return error;
+
+out_finish:
+ xfs_bmapi_finish(&bma, whichfork, error);
+out_trans_cancel:
+ xfs_trans_cancel(tp);
+ xfs_iunlock(ip, XFS_ILOCK_EXCL);
+ return error;
+}
+
+int
+xfs_bmapi_remap(
+ struct xfs_trans *tp,
+ struct xfs_inode *ip,
+ xfs_fileoff_t bno,
+ xfs_filblks_t len,
+ xfs_fsblock_t startblock,
+ uint32_t flags)
+{
+ struct xfs_mount *mp = ip->i_mount;
+ struct xfs_ifork *ifp;
+ struct xfs_btree_cur *cur = NULL;
+ struct xfs_bmbt_irec got;
+ struct xfs_iext_cursor icur;
+ int whichfork = xfs_bmapi_whichfork(flags);
+ int logflags = 0, error;
+
+ ifp = xfs_ifork_ptr(ip, whichfork);
+ ASSERT(len > 0);
+ ASSERT(len <= (xfs_filblks_t)XFS_MAX_BMBT_EXTLEN);
+ ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
+ ASSERT(!(flags & ~(XFS_BMAPI_ATTRFORK | XFS_BMAPI_PREALLOC |
+ XFS_BMAPI_NORMAP)));
+ ASSERT((flags & (XFS_BMAPI_ATTRFORK | XFS_BMAPI_PREALLOC)) !=
+ (XFS_BMAPI_ATTRFORK | XFS_BMAPI_PREALLOC));
+
+ if (XFS_IS_CORRUPT(mp, !xfs_ifork_has_extents(ifp)) ||
+ XFS_TEST_ERROR(false, mp, XFS_ERRTAG_BMAPIFORMAT)) {
+ return -EFSCORRUPTED;
+ }
+
+ if (xfs_is_shutdown(mp))
+ return -EIO;
+
+ error = xfs_iread_extents(tp, ip, whichfork);
+ if (error)
+ return error;
+
+ if (xfs_iext_lookup_extent(ip, ifp, bno, &icur, &got)) {
+ /* make sure we only reflink into a hole. */
+ ASSERT(got.br_startoff > bno);
+ ASSERT(got.br_startoff - bno >= len);
+ }
+
+ ip->i_nblocks += len;
+ xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
+
+ if (ifp->if_format == XFS_DINODE_FMT_BTREE) {
+ cur = xfs_bmbt_init_cursor(mp, tp, ip, whichfork);
+ cur->bc_ino.flags = 0;
+ }
+
+ got.br_startoff = bno;
+ got.br_startblock = startblock;
+ got.br_blockcount = len;
+ if (flags & XFS_BMAPI_PREALLOC)
+ got.br_state = XFS_EXT_UNWRITTEN;
+ else
+ got.br_state = XFS_EXT_NORM;
+
+ error = xfs_bmap_add_extent_hole_real(tp, ip, whichfork, &icur,
+ &cur, &got, &logflags, flags);
+ if (error)
+ goto error0;
+
+ error = xfs_bmap_btree_to_extents(tp, ip, cur, &logflags, whichfork);
+
+error0:
+ if (ip->i_df.if_format != XFS_DINODE_FMT_EXTENTS)
+ logflags &= ~XFS_ILOG_DEXT;
+ else if (ip->i_df.if_format != XFS_DINODE_FMT_BTREE)
+ logflags &= ~XFS_ILOG_DBROOT;
+
+ if (logflags)
+ xfs_trans_log_inode(tp, ip, logflags);
+ if (cur)
+ xfs_btree_del_cursor(cur, error);
+ return error;
+}
+
+/*
+ * When a delalloc extent is split (e.g., due to a hole punch), the original
+ * indlen reservation must be shared across the two new extents that are left
+ * behind.
+ *
+ * Given the original reservation and the worst case indlen for the two new
+ * extents (as calculated by xfs_bmap_worst_indlen()), split the original
+ * reservation fairly across the two new extents. If necessary, steal available
+ * blocks from a deleted extent to make up a reservation deficiency (e.g., if
+ * ores == 1). The number of stolen blocks is returned. The availability and
+ * subsequent accounting of stolen blocks is the responsibility of the caller.
+ */
+static xfs_filblks_t
+xfs_bmap_split_indlen(
+ xfs_filblks_t ores, /* original res. */
+ xfs_filblks_t *indlen1, /* ext1 worst indlen */
+ xfs_filblks_t *indlen2, /* ext2 worst indlen */
+ xfs_filblks_t avail) /* stealable blocks */
+{
+ xfs_filblks_t len1 = *indlen1;
+ xfs_filblks_t len2 = *indlen2;
+ xfs_filblks_t nres = len1 + len2; /* new total res. */
+ xfs_filblks_t stolen = 0;
+ xfs_filblks_t resfactor;
+
+ /*
+ * Steal as many blocks as we can to try and satisfy the worst case
+ * indlen for both new extents.
+ */
+ if (ores < nres && avail)
+ stolen = XFS_FILBLKS_MIN(nres - ores, avail);
+ ores += stolen;
+
+ /* nothing else to do if we've satisfied the new reservation */
+ if (ores >= nres)
+ return stolen;
+
+ /*
+ * We can't meet the total required reservation for the two extents.
+ * Calculate the percent of the overall shortage between both extents
+ * and apply this percentage to each of the requested indlen values.
+ * This distributes the shortage fairly and reduces the chances that one
+ * of the two extents is left with nothing when extents are repeatedly
+ * split.
+ */
+ resfactor = (ores * 100);
+ do_div(resfactor, nres);
+ len1 *= resfactor;
+ do_div(len1, 100);
+ len2 *= resfactor;
+ do_div(len2, 100);
+ ASSERT(len1 + len2 <= ores);
+ ASSERT(len1 < *indlen1 && len2 < *indlen2);
+
+ /*
+ * Hand out the remainder to each extent. If one of the two reservations
+ * is zero, we want to make sure that one gets a block first. The loop
+ * below starts with len1, so hand len2 a block right off the bat if it
+ * is zero.
+ */
+ ores -= (len1 + len2);
+ ASSERT((*indlen1 - len1) + (*indlen2 - len2) >= ores);
+ if (ores && !len2 && *indlen2) {
+ len2++;
+ ores--;
+ }
+ while (ores) {
+ if (len1 < *indlen1) {
+ len1++;
+ ores--;
+ }
+ if (!ores)
+ break;
+ if (len2 < *indlen2) {
+ len2++;
+ ores--;
+ }
+ }
+
+ *indlen1 = len1;
+ *indlen2 = len2;
+
+ return stolen;
+}
+
+int
+xfs_bmap_del_extent_delay(
+ struct xfs_inode *ip,
+ int whichfork,
+ struct xfs_iext_cursor *icur,
+ struct xfs_bmbt_irec *got,
+ struct xfs_bmbt_irec *del)
+{
+ struct xfs_mount *mp = ip->i_mount;
+ struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork);
+ struct xfs_bmbt_irec new;
+ int64_t da_old, da_new, da_diff = 0;
+ xfs_fileoff_t del_endoff, got_endoff;
+ xfs_filblks_t got_indlen, new_indlen, stolen;
+ uint32_t state = xfs_bmap_fork_to_state(whichfork);
+ int error = 0;
+ bool isrt;
+
+ XFS_STATS_INC(mp, xs_del_exlist);
+
+ isrt = (whichfork == XFS_DATA_FORK) && XFS_IS_REALTIME_INODE(ip);
+ del_endoff = del->br_startoff + del->br_blockcount;
+ got_endoff = got->br_startoff + got->br_blockcount;
+ da_old = startblockval(got->br_startblock);
+ da_new = 0;
+
+ ASSERT(del->br_blockcount > 0);
+ ASSERT(got->br_startoff <= del->br_startoff);
+ ASSERT(got_endoff >= del_endoff);
+
+ if (isrt) {
+ uint64_t rtexts = XFS_FSB_TO_B(mp, del->br_blockcount);
+
+ do_div(rtexts, mp->m_sb.sb_rextsize);
+ xfs_mod_frextents(mp, rtexts);
+ }
+
+ /*
+ * Update the inode delalloc counter now and wait to update the
+ * sb counters as we might have to borrow some blocks for the
+ * indirect block accounting.
+ */
+ ASSERT(!isrt);
+ error = xfs_quota_unreserve_blkres(ip, del->br_blockcount);
+ if (error)
+ return error;
+ ip->i_delayed_blks -= del->br_blockcount;
+
+ if (got->br_startoff == del->br_startoff)
+ state |= BMAP_LEFT_FILLING;
+ if (got_endoff == del_endoff)
+ state |= BMAP_RIGHT_FILLING;
+
+ switch (state & (BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING)) {
+ case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING:
+ /*
+ * Matches the whole extent. Delete the entry.
+ */
+ xfs_iext_remove(ip, icur, state);
+ xfs_iext_prev(ifp, icur);
+ break;
+ case BMAP_LEFT_FILLING:
+ /*
+ * Deleting the first part of the extent.
+ */
+ got->br_startoff = del_endoff;
+ got->br_blockcount -= del->br_blockcount;
+ da_new = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip,
+ got->br_blockcount), da_old);
+ got->br_startblock = nullstartblock((int)da_new);
+ xfs_iext_update_extent(ip, state, icur, got);
+ break;
+ case BMAP_RIGHT_FILLING:
+ /*
+ * Deleting the last part of the extent.
+ */
+ got->br_blockcount = got->br_blockcount - del->br_blockcount;
+ da_new = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip,
+ got->br_blockcount), da_old);
+ got->br_startblock = nullstartblock((int)da_new);
+ xfs_iext_update_extent(ip, state, icur, got);
+ break;
+ case 0:
+ /*
+ * Deleting the middle of the extent.
+ *
+ * Distribute the original indlen reservation across the two new
+ * extents. Steal blocks from the deleted extent if necessary.
+ * Stealing blocks simply fudges the fdblocks accounting below.
+ * Warn if either of the new indlen reservations is zero as this
+ * can lead to delalloc problems.
+ */
+ got->br_blockcount = del->br_startoff - got->br_startoff;
+ got_indlen = xfs_bmap_worst_indlen(ip, got->br_blockcount);
+
+ new.br_blockcount = got_endoff - del_endoff;
+ new_indlen = xfs_bmap_worst_indlen(ip, new.br_blockcount);
+
+ WARN_ON_ONCE(!got_indlen || !new_indlen);
+ stolen = xfs_bmap_split_indlen(da_old, &got_indlen, &new_indlen,
+ del->br_blockcount);
+
+ got->br_startblock = nullstartblock((int)got_indlen);
+
+ new.br_startoff = del_endoff;
+ new.br_state = got->br_state;
+ new.br_startblock = nullstartblock((int)new_indlen);
+
+ xfs_iext_update_extent(ip, state, icur, got);
+ xfs_iext_next(ifp, icur);
+ xfs_iext_insert(ip, icur, &new, state);
+
+ da_new = got_indlen + new_indlen - stolen;
+ del->br_blockcount -= stolen;
+ break;
+ }
+
+ ASSERT(da_old >= da_new);
+ da_diff = da_old - da_new;
+ if (!isrt)
+ da_diff += del->br_blockcount;
+ if (da_diff) {
+ xfs_mod_fdblocks(mp, da_diff, false);
+ xfs_mod_delalloc(mp, -da_diff);
+ }
+ return error;
+}
+
+void
+xfs_bmap_del_extent_cow(
+ struct xfs_inode *ip,
+ struct xfs_iext_cursor *icur,
+ struct xfs_bmbt_irec *got,
+ struct xfs_bmbt_irec *del)
+{
+ struct xfs_mount *mp = ip->i_mount;
+ struct xfs_ifork *ifp = xfs_ifork_ptr(ip, XFS_COW_FORK);
+ struct xfs_bmbt_irec new;
+ xfs_fileoff_t del_endoff, got_endoff;
+ uint32_t state = BMAP_COWFORK;
+
+ XFS_STATS_INC(mp, xs_del_exlist);
+
+ del_endoff = del->br_startoff + del->br_blockcount;
+ got_endoff = got->br_startoff + got->br_blockcount;
+
+ ASSERT(del->br_blockcount > 0);
+ ASSERT(got->br_startoff <= del->br_startoff);
+ ASSERT(got_endoff >= del_endoff);
+ ASSERT(!isnullstartblock(got->br_startblock));
+
+ if (got->br_startoff == del->br_startoff)
+ state |= BMAP_LEFT_FILLING;
+ if (got_endoff == del_endoff)
+ state |= BMAP_RIGHT_FILLING;
+
+ switch (state & (BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING)) {
+ case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING:
+ /*
+ * Matches the whole extent. Delete the entry.
+ */
+ xfs_iext_remove(ip, icur, state);
+ xfs_iext_prev(ifp, icur);
+ break;
+ case BMAP_LEFT_FILLING:
+ /*
+ * Deleting the first part of the extent.
+ */
+ got->br_startoff = del_endoff;
+ got->br_blockcount -= del->br_blockcount;
+ got->br_startblock = del->br_startblock + del->br_blockcount;
+ xfs_iext_update_extent(ip, state, icur, got);
+ break;
+ case BMAP_RIGHT_FILLING:
+ /*
+ * Deleting the last part of the extent.
+ */
+ got->br_blockcount -= del->br_blockcount;
+ xfs_iext_update_extent(ip, state, icur, got);
+ break;
+ case 0:
+ /*
+ * Deleting the middle of the extent.
+ */
+ got->br_blockcount = del->br_startoff - got->br_startoff;
+
+ new.br_startoff = del_endoff;
+ new.br_blockcount = got_endoff - del_endoff;
+ new.br_state = got->br_state;
+ new.br_startblock = del->br_startblock + del->br_blockcount;
+
+ xfs_iext_update_extent(ip, state, icur, got);
+ xfs_iext_next(ifp, icur);
+ xfs_iext_insert(ip, icur, &new, state);
+ break;
+ }
+ ip->i_delayed_blks -= del->br_blockcount;
+}
+
+/*
+ * Called by xfs_bmapi to update file extent records and the btree
+ * after removing space.
+ */
+STATIC int /* error */
+xfs_bmap_del_extent_real(
+ xfs_inode_t *ip, /* incore inode pointer */
+ xfs_trans_t *tp, /* current transaction pointer */
+ struct xfs_iext_cursor *icur,
+ struct xfs_btree_cur *cur, /* if null, not a btree */
+ xfs_bmbt_irec_t *del, /* data to remove from extents */
+ int *logflagsp, /* inode logging flags */
+ int whichfork, /* data or attr fork */
+ uint32_t bflags) /* bmapi flags */
+{
+ xfs_fsblock_t del_endblock=0; /* first block past del */
+ xfs_fileoff_t del_endoff; /* first offset past del */
+ int do_fx; /* free extent at end of routine */
+ int error; /* error return value */
+ int flags = 0;/* inode logging flags */
+ struct xfs_bmbt_irec got; /* current extent entry */
+ xfs_fileoff_t got_endoff; /* first offset past got */
+ int i; /* temp state */
+ struct xfs_ifork *ifp; /* inode fork pointer */
+ xfs_mount_t *mp; /* mount structure */
+ xfs_filblks_t nblks; /* quota/sb block count */
+ xfs_bmbt_irec_t new; /* new record to be inserted */
+ /* REFERENCED */
+ uint qfield; /* quota field to update */
+ uint32_t state = xfs_bmap_fork_to_state(whichfork);
+ struct xfs_bmbt_irec old;
+
+ mp = ip->i_mount;
+ XFS_STATS_INC(mp, xs_del_exlist);
+
+ ifp = xfs_ifork_ptr(ip, whichfork);
+ ASSERT(del->br_blockcount > 0);
+ xfs_iext_get_extent(ifp, icur, &got);
+ ASSERT(got.br_startoff <= del->br_startoff);
+ del_endoff = del->br_startoff + del->br_blockcount;
+ got_endoff = got.br_startoff + got.br_blockcount;
+ ASSERT(got_endoff >= del_endoff);
+ ASSERT(!isnullstartblock(got.br_startblock));
+ qfield = 0;
+ error = 0;
+
+ /*
+ * If it's the case where the directory code is running with no block
+ * reservation, and the deleted block is in the middle of its extent,
+ * and the resulting insert of an extent would cause transformation to
+ * btree format, then reject it. The calling code will then swap blocks
+ * around instead. We have to do this now, rather than waiting for the
+ * conversion to btree format, since the transaction will be dirty then.
+ */
+ if (tp->t_blk_res == 0 &&
+ ifp->if_format == XFS_DINODE_FMT_EXTENTS &&
+ ifp->if_nextents >= XFS_IFORK_MAXEXT(ip, whichfork) &&
+ del->br_startoff > got.br_startoff && del_endoff < got_endoff)
+ return -ENOSPC;
+
+ flags = XFS_ILOG_CORE;
+ if (whichfork == XFS_DATA_FORK && XFS_IS_REALTIME_INODE(ip)) {
+ xfs_filblks_t len;
+ xfs_extlen_t mod;
+
+ len = div_u64_rem(del->br_blockcount, mp->m_sb.sb_rextsize,
+ &mod);
+ ASSERT(mod == 0);
+
+ if (!(bflags & XFS_BMAPI_REMAP)) {
+ xfs_fsblock_t bno;
+
+ bno = div_u64_rem(del->br_startblock,
+ mp->m_sb.sb_rextsize, &mod);
+ ASSERT(mod == 0);
+
+ error = xfs_rtfree_extent(tp, bno, (xfs_extlen_t)len);
+ if (error)
+ goto done;
+ }
+
+ do_fx = 0;
+ nblks = len * mp->m_sb.sb_rextsize;
+ qfield = XFS_TRANS_DQ_RTBCOUNT;
+ } else {
+ do_fx = 1;
+ nblks = del->br_blockcount;
+ qfield = XFS_TRANS_DQ_BCOUNT;
+ }
+
+ del_endblock = del->br_startblock + del->br_blockcount;
+ if (cur) {
+ error = xfs_bmbt_lookup_eq(cur, &got, &i);
+ if (error)
+ goto done;
+ if (XFS_IS_CORRUPT(mp, i != 1)) {
+ error = -EFSCORRUPTED;
+ goto done;
+ }
+ }
+
+ if (got.br_startoff == del->br_startoff)
+ state |= BMAP_LEFT_FILLING;
+ if (got_endoff == del_endoff)
+ state |= BMAP_RIGHT_FILLING;
+
+ switch (state & (BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING)) {
+ case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING:
+ /*
+ * Matches the whole extent. Delete the entry.
+ */
+ xfs_iext_remove(ip, icur, state);
+ xfs_iext_prev(ifp, icur);
+ ifp->if_nextents--;
+
+ flags |= XFS_ILOG_CORE;
+ if (!cur) {
+ flags |= xfs_ilog_fext(whichfork);
+ break;
+ }
+ if ((error = xfs_btree_delete(cur, &i)))
+ goto done;
+ if (XFS_IS_CORRUPT(mp, i != 1)) {
+ error = -EFSCORRUPTED;
+ goto done;
+ }
+ break;
+ case BMAP_LEFT_FILLING:
+ /*
+ * Deleting the first part of the extent.
+ */
+ got.br_startoff = del_endoff;
+ got.br_startblock = del_endblock;
+ got.br_blockcount -= del->br_blockcount;
+ xfs_iext_update_extent(ip, state, icur, &got);
+ if (!cur) {
+ flags |= xfs_ilog_fext(whichfork);
+ break;
+ }
+ error = xfs_bmbt_update(cur, &got);
+ if (error)
+ goto done;
+ break;
+ case BMAP_RIGHT_FILLING:
+ /*
+ * Deleting the last part of the extent.
+ */
+ got.br_blockcount -= del->br_blockcount;
+ xfs_iext_update_extent(ip, state, icur, &got);
+ if (!cur) {
+ flags |= xfs_ilog_fext(whichfork);
+ break;
+ }
+ error = xfs_bmbt_update(cur, &got);
+ if (error)
+ goto done;
+ break;
+ case 0:
+ /*
+ * Deleting the middle of the extent.
+ */
+
+ old = got;
+
+ got.br_blockcount = del->br_startoff - got.br_startoff;
+ xfs_iext_update_extent(ip, state, icur, &got);
+
+ new.br_startoff = del_endoff;
+ new.br_blockcount = got_endoff - del_endoff;
+ new.br_state = got.br_state;
+ new.br_startblock = del_endblock;
+
+ flags |= XFS_ILOG_CORE;
+ if (cur) {
+ error = xfs_bmbt_update(cur, &got);
+ if (error)
+ goto done;
+ error = xfs_btree_increment(cur, 0, &i);
+ if (error)
+ goto done;
+ cur->bc_rec.b = new;
+ error = xfs_btree_insert(cur, &i);
+ if (error && error != -ENOSPC)
+ goto done;
+ /*
+ * If get no-space back from btree insert, it tried a
+ * split, and we have a zero block reservation. Fix up
+ * our state and return the error.
+ */
+ if (error == -ENOSPC) {
+ /*
+ * Reset the cursor, don't trust it after any
+ * insert operation.
+ */
+ error = xfs_bmbt_lookup_eq(cur, &got, &i);
+ if (error)
+ goto done;
+ if (XFS_IS_CORRUPT(mp, i != 1)) {
+ error = -EFSCORRUPTED;
+ goto done;
+ }
+ /*
+ * Update the btree record back
+ * to the original value.
+ */
+ error = xfs_bmbt_update(cur, &old);
+ if (error)
+ goto done;
+ /*
+ * Reset the extent record back
+ * to the original value.
+ */
+ xfs_iext_update_extent(ip, state, icur, &old);
+ flags = 0;
+ error = -ENOSPC;
+ goto done;
+ }
+ if (XFS_IS_CORRUPT(mp, i != 1)) {
+ error = -EFSCORRUPTED;
+ goto done;
+ }
+ } else
+ flags |= xfs_ilog_fext(whichfork);
+
+ ifp->if_nextents++;
+ xfs_iext_next(ifp, icur);
+ xfs_iext_insert(ip, icur, &new, state);
+ break;
+ }
+
+ /* remove reverse mapping */
+ xfs_rmap_unmap_extent(tp, ip, whichfork, del);
+
+ /*
+ * If we need to, add to list of extents to delete.
+ */
+ if (do_fx && !(bflags & XFS_BMAPI_REMAP)) {
+ if (xfs_is_reflink_inode(ip) && whichfork == XFS_DATA_FORK) {
+ xfs_refcount_decrease_extent(tp, del);
+ } else {
+ error = __xfs_free_extent_later(tp, del->br_startblock,
+ del->br_blockcount, NULL,
+ XFS_AG_RESV_NONE,
+ ((bflags & XFS_BMAPI_NODISCARD) ||
+ del->br_state == XFS_EXT_UNWRITTEN));
+ if (error)
+ goto done;
+ }
+ }
+
+ /*
+ * Adjust inode # blocks in the file.
+ */
+ if (nblks)
+ ip->i_nblocks -= nblks;
+ /*
+ * Adjust quota data.
+ */
+ if (qfield && !(bflags & XFS_BMAPI_REMAP))
+ xfs_trans_mod_dquot_byino(tp, ip, qfield, (long)-nblks);
+
+done:
+ *logflagsp = flags;
+ return error;
+}
+
+/*
+ * Unmap (remove) blocks from a file.
+ * If nexts is nonzero then the number of extents to remove is limited to
+ * that value. If not all extents in the block range can be removed then
+ * *done is set.
+ */
+int /* error */
+__xfs_bunmapi(
+ struct xfs_trans *tp, /* transaction pointer */
+ struct xfs_inode *ip, /* incore inode */
+ xfs_fileoff_t start, /* first file offset deleted */
+ xfs_filblks_t *rlen, /* i/o: amount remaining */
+ uint32_t flags, /* misc flags */
+ xfs_extnum_t nexts) /* number of extents max */
+{
+ struct xfs_btree_cur *cur; /* bmap btree cursor */
+ struct xfs_bmbt_irec del; /* extent being deleted */
+ int error; /* error return value */
+ xfs_extnum_t extno; /* extent number in list */
+ struct xfs_bmbt_irec got; /* current extent record */
+ struct xfs_ifork *ifp; /* inode fork pointer */
+ int isrt; /* freeing in rt area */
+ int logflags; /* transaction logging flags */
+ xfs_extlen_t mod; /* rt extent offset */
+ struct xfs_mount *mp = ip->i_mount;
+ int tmp_logflags; /* partial logging flags */
+ int wasdel; /* was a delayed alloc extent */
+ int whichfork; /* data or attribute fork */
+ xfs_fsblock_t sum;
+ xfs_filblks_t len = *rlen; /* length to unmap in file */
+ xfs_fileoff_t end;
+ struct xfs_iext_cursor icur;
+ bool done = false;
+
+ trace_xfs_bunmap(ip, start, len, flags, _RET_IP_);
+
+ whichfork = xfs_bmapi_whichfork(flags);
+ ASSERT(whichfork != XFS_COW_FORK);
+ ifp = xfs_ifork_ptr(ip, whichfork);
+ if (XFS_IS_CORRUPT(mp, !xfs_ifork_has_extents(ifp)))
+ return -EFSCORRUPTED;
+ if (xfs_is_shutdown(mp))
+ return -EIO;
+
+ ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
+ ASSERT(len > 0);
+ ASSERT(nexts >= 0);
+
+ error = xfs_iread_extents(tp, ip, whichfork);
+ if (error)
+ return error;
+
+ if (xfs_iext_count(ifp) == 0) {
+ *rlen = 0;
+ return 0;
+ }
+ XFS_STATS_INC(mp, xs_blk_unmap);
+ isrt = (whichfork == XFS_DATA_FORK) && XFS_IS_REALTIME_INODE(ip);
+ end = start + len;
+
+ if (!xfs_iext_lookup_extent_before(ip, ifp, &end, &icur, &got)) {
+ *rlen = 0;
+ return 0;
+ }
+ end--;
+
+ logflags = 0;
+ if (ifp->if_format == XFS_DINODE_FMT_BTREE) {
+ ASSERT(ifp->if_format == XFS_DINODE_FMT_BTREE);
+ cur = xfs_bmbt_init_cursor(mp, tp, ip, whichfork);
+ cur->bc_ino.flags = 0;
+ } else
+ cur = NULL;
+
+ if (isrt) {
+ /*
+ * Synchronize by locking the bitmap inode.
+ */
+ xfs_ilock(mp->m_rbmip, XFS_ILOCK_EXCL|XFS_ILOCK_RTBITMAP);
+ xfs_trans_ijoin(tp, mp->m_rbmip, XFS_ILOCK_EXCL);
+ xfs_ilock(mp->m_rsumip, XFS_ILOCK_EXCL|XFS_ILOCK_RTSUM);
+ xfs_trans_ijoin(tp, mp->m_rsumip, XFS_ILOCK_EXCL);
+ }
+
+ extno = 0;
+ while (end != (xfs_fileoff_t)-1 && end >= start &&
+ (nexts == 0 || extno < nexts)) {
+ /*
+ * Is the found extent after a hole in which end lives?
+ * Just back up to the previous extent, if so.
+ */
+ if (got.br_startoff > end &&
+ !xfs_iext_prev_extent(ifp, &icur, &got)) {
+ done = true;
+ break;
+ }
+ /*
+ * Is the last block of this extent before the range
+ * we're supposed to delete? If so, we're done.
+ */
+ end = XFS_FILEOFF_MIN(end,
+ got.br_startoff + got.br_blockcount - 1);
+ if (end < start)
+ break;
+ /*
+ * Then deal with the (possibly delayed) allocated space
+ * we found.
+ */
+ del = got;
+ wasdel = isnullstartblock(del.br_startblock);
+
+ if (got.br_startoff < start) {
+ del.br_startoff = start;
+ del.br_blockcount -= start - got.br_startoff;
+ if (!wasdel)
+ del.br_startblock += start - got.br_startoff;
+ }
+ if (del.br_startoff + del.br_blockcount > end + 1)
+ del.br_blockcount = end + 1 - del.br_startoff;
+
+ if (!isrt)
+ goto delete;
+
+ sum = del.br_startblock + del.br_blockcount;
+ div_u64_rem(sum, mp->m_sb.sb_rextsize, &mod);
+ if (mod) {
+ /*
+ * Realtime extent not lined up at the end.
+ * The extent could have been split into written
+ * and unwritten pieces, or we could just be
+ * unmapping part of it. But we can't really
+ * get rid of part of a realtime extent.
+ */
+ if (del.br_state == XFS_EXT_UNWRITTEN) {
+ /*
+ * This piece is unwritten, or we're not
+ * using unwritten extents. Skip over it.
+ */
+ ASSERT(end >= mod);
+ end -= mod > del.br_blockcount ?
+ del.br_blockcount : mod;
+ if (end < got.br_startoff &&
+ !xfs_iext_prev_extent(ifp, &icur, &got)) {
+ done = true;
+ break;
+ }
+ continue;
+ }
+ /*
+ * It's written, turn it unwritten.
+ * This is better than zeroing it.
+ */
+ ASSERT(del.br_state == XFS_EXT_NORM);
+ ASSERT(tp->t_blk_res > 0);
+ /*
+ * If this spans a realtime extent boundary,
+ * chop it back to the start of the one we end at.
+ */
+ if (del.br_blockcount > mod) {
+ del.br_startoff += del.br_blockcount - mod;
+ del.br_startblock += del.br_blockcount - mod;
+ del.br_blockcount = mod;
+ }
+ del.br_state = XFS_EXT_UNWRITTEN;
+ error = xfs_bmap_add_extent_unwritten_real(tp, ip,
+ whichfork, &icur, &cur, &del,
+ &logflags);
+ if (error)
+ goto error0;
+ goto nodelete;
+ }
+ div_u64_rem(del.br_startblock, mp->m_sb.sb_rextsize, &mod);
+ if (mod) {
+ xfs_extlen_t off = mp->m_sb.sb_rextsize - mod;
+
+ /*
+ * Realtime extent is lined up at the end but not
+ * at the front. We'll get rid of full extents if
+ * we can.
+ */
+ if (del.br_blockcount > off) {
+ del.br_blockcount -= off;
+ del.br_startoff += off;
+ del.br_startblock += off;
+ } else if (del.br_startoff == start &&
+ (del.br_state == XFS_EXT_UNWRITTEN ||
+ tp->t_blk_res == 0)) {
+ /*
+ * Can't make it unwritten. There isn't
+ * a full extent here so just skip it.
+ */
+ ASSERT(end >= del.br_blockcount);
+ end -= del.br_blockcount;
+ if (got.br_startoff > end &&
+ !xfs_iext_prev_extent(ifp, &icur, &got)) {
+ done = true;
+ break;
+ }
+ continue;
+ } else if (del.br_state == XFS_EXT_UNWRITTEN) {
+ struct xfs_bmbt_irec prev;
+ xfs_fileoff_t unwrite_start;
+
+ /*
+ * This one is already unwritten.
+ * It must have a written left neighbor.
+ * Unwrite the killed part of that one and
+ * try again.
+ */
+ if (!xfs_iext_prev_extent(ifp, &icur, &prev))
+ ASSERT(0);
+ ASSERT(prev.br_state == XFS_EXT_NORM);
+ ASSERT(!isnullstartblock(prev.br_startblock));
+ ASSERT(del.br_startblock ==
+ prev.br_startblock + prev.br_blockcount);
+ unwrite_start = max3(start,
+ del.br_startoff - mod,
+ prev.br_startoff);
+ mod = unwrite_start - prev.br_startoff;
+ prev.br_startoff = unwrite_start;
+ prev.br_startblock += mod;
+ prev.br_blockcount -= mod;
+ prev.br_state = XFS_EXT_UNWRITTEN;
+ error = xfs_bmap_add_extent_unwritten_real(tp,
+ ip, whichfork, &icur, &cur,
+ &prev, &logflags);
+ if (error)
+ goto error0;
+ goto nodelete;
+ } else {
+ ASSERT(del.br_state == XFS_EXT_NORM);
+ del.br_state = XFS_EXT_UNWRITTEN;
+ error = xfs_bmap_add_extent_unwritten_real(tp,
+ ip, whichfork, &icur, &cur,
+ &del, &logflags);
+ if (error)
+ goto error0;
+ goto nodelete;
+ }
+ }
+
+delete:
+ if (wasdel) {
+ error = xfs_bmap_del_extent_delay(ip, whichfork, &icur,
+ &got, &del);
+ } else {
+ error = xfs_bmap_del_extent_real(ip, tp, &icur, cur,
+ &del, &tmp_logflags, whichfork,
+ flags);
+ logflags |= tmp_logflags;
+ }
+
+ if (error)
+ goto error0;
+
+ end = del.br_startoff - 1;
+nodelete:
+ /*
+ * If not done go on to the next (previous) record.
+ */
+ if (end != (xfs_fileoff_t)-1 && end >= start) {
+ if (!xfs_iext_get_extent(ifp, &icur, &got) ||
+ (got.br_startoff > end &&
+ !xfs_iext_prev_extent(ifp, &icur, &got))) {
+ done = true;
+ break;
+ }
+ extno++;
+ }
+ }
+ if (done || end == (xfs_fileoff_t)-1 || end < start)
+ *rlen = 0;
+ else
+ *rlen = end - start + 1;
+
+ /*
+ * Convert to a btree if necessary.
+ */
+ if (xfs_bmap_needs_btree(ip, whichfork)) {
+ ASSERT(cur == NULL);
+ error = xfs_bmap_extents_to_btree(tp, ip, &cur, 0,
+ &tmp_logflags, whichfork);
+ logflags |= tmp_logflags;
+ } else {
+ error = xfs_bmap_btree_to_extents(tp, ip, cur, &logflags,
+ whichfork);
+ }
+
+error0:
+ /*
+ * Log everything. Do this after conversion, there's no point in
+ * logging the extent records if we've converted to btree format.
+ */
+ if ((logflags & xfs_ilog_fext(whichfork)) &&
+ ifp->if_format != XFS_DINODE_FMT_EXTENTS)
+ logflags &= ~xfs_ilog_fext(whichfork);
+ else if ((logflags & xfs_ilog_fbroot(whichfork)) &&
+ ifp->if_format != XFS_DINODE_FMT_BTREE)
+ logflags &= ~xfs_ilog_fbroot(whichfork);
+ /*
+ * Log inode even in the error case, if the transaction
+ * is dirty we'll need to shut down the filesystem.
+ */
+ if (logflags)
+ xfs_trans_log_inode(tp, ip, logflags);
+ if (cur) {
+ if (!error)
+ cur->bc_ino.allocated = 0;
+ xfs_btree_del_cursor(cur, error);
+ }
+ return error;
+}
+
+/* Unmap a range of a file. */
+int
+xfs_bunmapi(
+ xfs_trans_t *tp,
+ struct xfs_inode *ip,
+ xfs_fileoff_t bno,
+ xfs_filblks_t len,
+ uint32_t flags,
+ xfs_extnum_t nexts,
+ int *done)
+{
+ int error;
+
+ error = __xfs_bunmapi(tp, ip, bno, &len, flags, nexts);
+ *done = (len == 0);
+ return error;
+}
+
+/*
+ * Determine whether an extent shift can be accomplished by a merge with the
+ * extent that precedes the target hole of the shift.
+ */
+STATIC bool
+xfs_bmse_can_merge(
+ struct xfs_bmbt_irec *left, /* preceding extent */
+ struct xfs_bmbt_irec *got, /* current extent to shift */
+ xfs_fileoff_t shift) /* shift fsb */
+{
+ xfs_fileoff_t startoff;
+
+ startoff = got->br_startoff - shift;
+
+ /*
+ * The extent, once shifted, must be adjacent in-file and on-disk with
+ * the preceding extent.
+ */
+ if ((left->br_startoff + left->br_blockcount != startoff) ||
+ (left->br_startblock + left->br_blockcount != got->br_startblock) ||
+ (left->br_state != got->br_state) ||
+ (left->br_blockcount + got->br_blockcount > XFS_MAX_BMBT_EXTLEN))
+ return false;
+
+ return true;
+}
+
+/*
+ * A bmap extent shift adjusts the file offset of an extent to fill a preceding
+ * hole in the file. If an extent shift would result in the extent being fully
+ * adjacent to the extent that currently precedes the hole, we can merge with
+ * the preceding extent rather than do the shift.
+ *
+ * This function assumes the caller has verified a shift-by-merge is possible
+ * with the provided extents via xfs_bmse_can_merge().
+ */
+STATIC int
+xfs_bmse_merge(
+ struct xfs_trans *tp,
+ struct xfs_inode *ip,
+ int whichfork,
+ xfs_fileoff_t shift, /* shift fsb */
+ struct xfs_iext_cursor *icur,
+ struct xfs_bmbt_irec *got, /* extent to shift */
+ struct xfs_bmbt_irec *left, /* preceding extent */
+ struct xfs_btree_cur *cur,
+ int *logflags) /* output */
+{
+ struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork);
+ struct xfs_bmbt_irec new;
+ xfs_filblks_t blockcount;
+ int error, i;
+ struct xfs_mount *mp = ip->i_mount;
+
+ blockcount = left->br_blockcount + got->br_blockcount;
+
+ ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL));
+ ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
+ ASSERT(xfs_bmse_can_merge(left, got, shift));
+
+ new = *left;
+ new.br_blockcount = blockcount;
+
+ /*
+ * Update the on-disk extent count, the btree if necessary and log the
+ * inode.
+ */
+ ifp->if_nextents--;
+ *logflags |= XFS_ILOG_CORE;
+ if (!cur) {
+ *logflags |= XFS_ILOG_DEXT;
+ goto done;
+ }
+
+ /* lookup and remove the extent to merge */
+ error = xfs_bmbt_lookup_eq(cur, got, &i);
+ if (error)
+ return error;
+ if (XFS_IS_CORRUPT(mp, i != 1))
+ return -EFSCORRUPTED;
+
+ error = xfs_btree_delete(cur, &i);
+ if (error)
+ return error;
+ if (XFS_IS_CORRUPT(mp, i != 1))
+ return -EFSCORRUPTED;
+
+ /* lookup and update size of the previous extent */
+ error = xfs_bmbt_lookup_eq(cur, left, &i);
+ if (error)
+ return error;
+ if (XFS_IS_CORRUPT(mp, i != 1))
+ return -EFSCORRUPTED;
+
+ error = xfs_bmbt_update(cur, &new);
+ if (error)
+ return error;
+
+ /* change to extent format if required after extent removal */
+ error = xfs_bmap_btree_to_extents(tp, ip, cur, logflags, whichfork);
+ if (error)
+ return error;
+
+done:
+ xfs_iext_remove(ip, icur, 0);
+ xfs_iext_prev(ifp, icur);
+ xfs_iext_update_extent(ip, xfs_bmap_fork_to_state(whichfork), icur,
+ &new);
+
+ /* update reverse mapping. rmap functions merge the rmaps for us */
+ xfs_rmap_unmap_extent(tp, ip, whichfork, got);
+ memcpy(&new, got, sizeof(new));
+ new.br_startoff = left->br_startoff + left->br_blockcount;
+ xfs_rmap_map_extent(tp, ip, whichfork, &new);
+ return 0;
+}
+
+static int
+xfs_bmap_shift_update_extent(
+ struct xfs_trans *tp,
+ struct xfs_inode *ip,
+ int whichfork,
+ struct xfs_iext_cursor *icur,
+ struct xfs_bmbt_irec *got,
+ struct xfs_btree_cur *cur,
+ int *logflags,
+ xfs_fileoff_t startoff)
+{
+ struct xfs_mount *mp = ip->i_mount;
+ struct xfs_bmbt_irec prev = *got;
+ int error, i;
+
+ *logflags |= XFS_ILOG_CORE;
+
+ got->br_startoff = startoff;
+
+ if (cur) {
+ error = xfs_bmbt_lookup_eq(cur, &prev, &i);
+ if (error)
+ return error;
+ if (XFS_IS_CORRUPT(mp, i != 1))
+ return -EFSCORRUPTED;
+
+ error = xfs_bmbt_update(cur, got);
+ if (error)
+ return error;
+ } else {
+ *logflags |= XFS_ILOG_DEXT;
+ }
+
+ xfs_iext_update_extent(ip, xfs_bmap_fork_to_state(whichfork), icur,
+ got);
+
+ /* update reverse mapping */
+ xfs_rmap_unmap_extent(tp, ip, whichfork, &prev);
+ xfs_rmap_map_extent(tp, ip, whichfork, got);
+ return 0;
+}
+
+int
+xfs_bmap_collapse_extents(
+ struct xfs_trans *tp,
+ struct xfs_inode *ip,
+ xfs_fileoff_t *next_fsb,
+ xfs_fileoff_t offset_shift_fsb,
+ bool *done)
+{
+ int whichfork = XFS_DATA_FORK;
+ struct xfs_mount *mp = ip->i_mount;
+ struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork);
+ struct xfs_btree_cur *cur = NULL;
+ struct xfs_bmbt_irec got, prev;
+ struct xfs_iext_cursor icur;
+ xfs_fileoff_t new_startoff;
+ int error = 0;
+ int logflags = 0;
+
+ if (XFS_IS_CORRUPT(mp, !xfs_ifork_has_extents(ifp)) ||
+ XFS_TEST_ERROR(false, mp, XFS_ERRTAG_BMAPIFORMAT)) {
+ return -EFSCORRUPTED;
+ }
+
+ if (xfs_is_shutdown(mp))
+ return -EIO;
+
+ ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL));
+
+ error = xfs_iread_extents(tp, ip, whichfork);
+ if (error)
+ return error;
+
+ if (ifp->if_format == XFS_DINODE_FMT_BTREE) {
+ cur = xfs_bmbt_init_cursor(mp, tp, ip, whichfork);
+ cur->bc_ino.flags = 0;
+ }
+
+ if (!xfs_iext_lookup_extent(ip, ifp, *next_fsb, &icur, &got)) {
+ *done = true;
+ goto del_cursor;
+ }
+ if (XFS_IS_CORRUPT(mp, isnullstartblock(got.br_startblock))) {
+ error = -EFSCORRUPTED;
+ goto del_cursor;
+ }
+
+ new_startoff = got.br_startoff - offset_shift_fsb;
+ if (xfs_iext_peek_prev_extent(ifp, &icur, &prev)) {
+ if (new_startoff < prev.br_startoff + prev.br_blockcount) {
+ error = -EINVAL;
+ goto del_cursor;
+ }
+
+ if (xfs_bmse_can_merge(&prev, &got, offset_shift_fsb)) {
+ error = xfs_bmse_merge(tp, ip, whichfork,
+ offset_shift_fsb, &icur, &got, &prev,
+ cur, &logflags);
+ if (error)
+ goto del_cursor;
+ goto done;
+ }
+ } else {
+ if (got.br_startoff < offset_shift_fsb) {
+ error = -EINVAL;
+ goto del_cursor;
+ }
+ }
+
+ error = xfs_bmap_shift_update_extent(tp, ip, whichfork, &icur, &got,
+ cur, &logflags, new_startoff);
+ if (error)
+ goto del_cursor;
+
+done:
+ if (!xfs_iext_next_extent(ifp, &icur, &got)) {
+ *done = true;
+ goto del_cursor;
+ }
+
+ *next_fsb = got.br_startoff;
+del_cursor:
+ if (cur)
+ xfs_btree_del_cursor(cur, error);
+ if (logflags)
+ xfs_trans_log_inode(tp, ip, logflags);
+ return error;
+}
+
+/* Make sure we won't be right-shifting an extent past the maximum bound. */
+int
+xfs_bmap_can_insert_extents(
+ struct xfs_inode *ip,
+ xfs_fileoff_t off,
+ xfs_fileoff_t shift)
+{
+ struct xfs_bmbt_irec got;
+ int is_empty;
+ int error = 0;
+
+ ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL));
+
+ if (xfs_is_shutdown(ip->i_mount))
+ return -EIO;
+
+ xfs_ilock(ip, XFS_ILOCK_EXCL);
+ error = xfs_bmap_last_extent(NULL, ip, XFS_DATA_FORK, &got, &is_empty);
+ if (!error && !is_empty && got.br_startoff >= off &&
+ ((got.br_startoff + shift) & BMBT_STARTOFF_MASK) < got.br_startoff)
+ error = -EINVAL;
+ xfs_iunlock(ip, XFS_ILOCK_EXCL);
+
+ return error;
+}
+
+int
+xfs_bmap_insert_extents(
+ struct xfs_trans *tp,
+ struct xfs_inode *ip,
+ xfs_fileoff_t *next_fsb,
+ xfs_fileoff_t offset_shift_fsb,
+ bool *done,
+ xfs_fileoff_t stop_fsb)
+{
+ int whichfork = XFS_DATA_FORK;
+ struct xfs_mount *mp = ip->i_mount;
+ struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork);
+ struct xfs_btree_cur *cur = NULL;
+ struct xfs_bmbt_irec got, next;
+ struct xfs_iext_cursor icur;
+ xfs_fileoff_t new_startoff;
+ int error = 0;
+ int logflags = 0;
+
+ if (XFS_IS_CORRUPT(mp, !xfs_ifork_has_extents(ifp)) ||
+ XFS_TEST_ERROR(false, mp, XFS_ERRTAG_BMAPIFORMAT)) {
+ return -EFSCORRUPTED;
+ }
+
+ if (xfs_is_shutdown(mp))
+ return -EIO;
+
+ ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL));
+
+ error = xfs_iread_extents(tp, ip, whichfork);
+ if (error)
+ return error;
+
+ if (ifp->if_format == XFS_DINODE_FMT_BTREE) {
+ cur = xfs_bmbt_init_cursor(mp, tp, ip, whichfork);
+ cur->bc_ino.flags = 0;
+ }
+
+ if (*next_fsb == NULLFSBLOCK) {
+ xfs_iext_last(ifp, &icur);
+ if (!xfs_iext_get_extent(ifp, &icur, &got) ||
+ stop_fsb > got.br_startoff) {
+ *done = true;
+ goto del_cursor;
+ }
+ } else {
+ if (!xfs_iext_lookup_extent(ip, ifp, *next_fsb, &icur, &got)) {
+ *done = true;
+ goto del_cursor;
+ }
+ }
+ if (XFS_IS_CORRUPT(mp, isnullstartblock(got.br_startblock))) {
+ error = -EFSCORRUPTED;
+ goto del_cursor;
+ }
+
+ if (XFS_IS_CORRUPT(mp, stop_fsb > got.br_startoff)) {
+ error = -EFSCORRUPTED;
+ goto del_cursor;
+ }
+
+ new_startoff = got.br_startoff + offset_shift_fsb;
+ if (xfs_iext_peek_next_extent(ifp, &icur, &next)) {
+ if (new_startoff + got.br_blockcount > next.br_startoff) {
+ error = -EINVAL;
+ goto del_cursor;
+ }
+
+ /*
+ * Unlike a left shift (which involves a hole punch), a right
+ * shift does not modify extent neighbors in any way. We should
+ * never find mergeable extents in this scenario. Check anyways
+ * and warn if we encounter two extents that could be one.
+ */
+ if (xfs_bmse_can_merge(&got, &next, offset_shift_fsb))
+ WARN_ON_ONCE(1);
+ }
+
+ error = xfs_bmap_shift_update_extent(tp, ip, whichfork, &icur, &got,
+ cur, &logflags, new_startoff);
+ if (error)
+ goto del_cursor;
+
+ if (!xfs_iext_prev_extent(ifp, &icur, &got) ||
+ stop_fsb >= got.br_startoff + got.br_blockcount) {
+ *done = true;
+ goto del_cursor;
+ }
+
+ *next_fsb = got.br_startoff;
+del_cursor:
+ if (cur)
+ xfs_btree_del_cursor(cur, error);
+ if (logflags)
+ xfs_trans_log_inode(tp, ip, logflags);
+ return error;
+}
+
+/*
+ * Splits an extent into two extents at split_fsb block such that it is the
+ * first block of the current_ext. @ext is a target extent to be split.
+ * @split_fsb is a block where the extents is split. If split_fsb lies in a
+ * hole or the first block of extents, just return 0.
+ */
+int
+xfs_bmap_split_extent(
+ struct xfs_trans *tp,
+ struct xfs_inode *ip,
+ xfs_fileoff_t split_fsb)
+{
+ int whichfork = XFS_DATA_FORK;
+ struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork);
+ struct xfs_btree_cur *cur = NULL;
+ struct xfs_bmbt_irec got;
+ struct xfs_bmbt_irec new; /* split extent */
+ struct xfs_mount *mp = ip->i_mount;
+ xfs_fsblock_t gotblkcnt; /* new block count for got */
+ struct xfs_iext_cursor icur;
+ int error = 0;
+ int logflags = 0;
+ int i = 0;
+
+ if (XFS_IS_CORRUPT(mp, !xfs_ifork_has_extents(ifp)) ||
+ XFS_TEST_ERROR(false, mp, XFS_ERRTAG_BMAPIFORMAT)) {
+ return -EFSCORRUPTED;
+ }
+
+ if (xfs_is_shutdown(mp))
+ return -EIO;
+
+ /* Read in all the extents */
+ error = xfs_iread_extents(tp, ip, whichfork);
+ if (error)
+ return error;
+
+ /*
+ * If there are not extents, or split_fsb lies in a hole we are done.
+ */
+ if (!xfs_iext_lookup_extent(ip, ifp, split_fsb, &icur, &got) ||
+ got.br_startoff >= split_fsb)
+ return 0;
+
+ gotblkcnt = split_fsb - got.br_startoff;
+ new.br_startoff = split_fsb;
+ new.br_startblock = got.br_startblock + gotblkcnt;
+ new.br_blockcount = got.br_blockcount - gotblkcnt;
+ new.br_state = got.br_state;
+
+ if (ifp->if_format == XFS_DINODE_FMT_BTREE) {
+ cur = xfs_bmbt_init_cursor(mp, tp, ip, whichfork);
+ cur->bc_ino.flags = 0;
+ error = xfs_bmbt_lookup_eq(cur, &got, &i);
+ if (error)
+ goto del_cursor;
+ if (XFS_IS_CORRUPT(mp, i != 1)) {
+ error = -EFSCORRUPTED;
+ goto del_cursor;
+ }
+ }
+
+ got.br_blockcount = gotblkcnt;
+ xfs_iext_update_extent(ip, xfs_bmap_fork_to_state(whichfork), &icur,
+ &got);
+
+ logflags = XFS_ILOG_CORE;
+ if (cur) {
+ error = xfs_bmbt_update(cur, &got);
+ if (error)
+ goto del_cursor;
+ } else
+ logflags |= XFS_ILOG_DEXT;
+
+ /* Add new extent */
+ xfs_iext_next(ifp, &icur);
+ xfs_iext_insert(ip, &icur, &new, 0);
+ ifp->if_nextents++;
+
+ if (cur) {
+ error = xfs_bmbt_lookup_eq(cur, &new, &i);
+ if (error)
+ goto del_cursor;
+ if (XFS_IS_CORRUPT(mp, i != 0)) {
+ error = -EFSCORRUPTED;
+ goto del_cursor;
+ }
+ error = xfs_btree_insert(cur, &i);
+ if (error)
+ goto del_cursor;
+ if (XFS_IS_CORRUPT(mp, i != 1)) {
+ error = -EFSCORRUPTED;
+ goto del_cursor;
+ }
+ }
+
+ /*
+ * Convert to a btree if necessary.
+ */
+ if (xfs_bmap_needs_btree(ip, whichfork)) {
+ int tmp_logflags; /* partial log flag return val */
+
+ ASSERT(cur == NULL);
+ error = xfs_bmap_extents_to_btree(tp, ip, &cur, 0,
+ &tmp_logflags, whichfork);
+ logflags |= tmp_logflags;
+ }
+
+del_cursor:
+ if (cur) {
+ cur->bc_ino.allocated = 0;
+ xfs_btree_del_cursor(cur, error);
+ }
+
+ if (logflags)
+ xfs_trans_log_inode(tp, ip, logflags);
+ return error;
+}
+
+/* Deferred mapping is only for real extents in the data fork. */
+static bool
+xfs_bmap_is_update_needed(
+ struct xfs_bmbt_irec *bmap)
+{
+ return bmap->br_startblock != HOLESTARTBLOCK &&
+ bmap->br_startblock != DELAYSTARTBLOCK;
+}
+
+/* Record a bmap intent. */
+static int
+__xfs_bmap_add(
+ struct xfs_trans *tp,
+ enum xfs_bmap_intent_type type,
+ struct xfs_inode *ip,
+ int whichfork,
+ struct xfs_bmbt_irec *bmap)
+{
+ struct xfs_bmap_intent *bi;
+
+ trace_xfs_bmap_defer(tp->t_mountp,
+ XFS_FSB_TO_AGNO(tp->t_mountp, bmap->br_startblock),
+ type,
+ XFS_FSB_TO_AGBNO(tp->t_mountp, bmap->br_startblock),
+ ip->i_ino, whichfork,
+ bmap->br_startoff,
+ bmap->br_blockcount,
+ bmap->br_state);
+
+ bi = kmem_cache_alloc(xfs_bmap_intent_cache, GFP_NOFS | __GFP_NOFAIL);
+ INIT_LIST_HEAD(&bi->bi_list);
+ bi->bi_type = type;
+ bi->bi_owner = ip;
+ bi->bi_whichfork = whichfork;
+ bi->bi_bmap = *bmap;
+
+ xfs_bmap_update_get_group(tp->t_mountp, bi);
+ xfs_defer_add(tp, XFS_DEFER_OPS_TYPE_BMAP, &bi->bi_list);
+ return 0;
+}
+
+/* Map an extent into a file. */
+void
+xfs_bmap_map_extent(
+ struct xfs_trans *tp,
+ struct xfs_inode *ip,
+ struct xfs_bmbt_irec *PREV)
+{
+ if (!xfs_bmap_is_update_needed(PREV))
+ return;
+
+ __xfs_bmap_add(tp, XFS_BMAP_MAP, ip, XFS_DATA_FORK, PREV);
+}
+
+/* Unmap an extent out of a file. */
+void
+xfs_bmap_unmap_extent(
+ struct xfs_trans *tp,
+ struct xfs_inode *ip,
+ struct xfs_bmbt_irec *PREV)
+{
+ if (!xfs_bmap_is_update_needed(PREV))
+ return;
+
+ __xfs_bmap_add(tp, XFS_BMAP_UNMAP, ip, XFS_DATA_FORK, PREV);
+}
+
+/*
+ * Process one of the deferred bmap operations. We pass back the
+ * btree cursor to maintain our lock on the bmapbt between calls.
+ */
+int
+xfs_bmap_finish_one(
+ struct xfs_trans *tp,
+ struct xfs_bmap_intent *bi)
+{
+ struct xfs_bmbt_irec *bmap = &bi->bi_bmap;
+ int error = 0;
+
+ ASSERT(tp->t_highest_agno == NULLAGNUMBER);
+
+ trace_xfs_bmap_deferred(tp->t_mountp,
+ XFS_FSB_TO_AGNO(tp->t_mountp, bmap->br_startblock),
+ bi->bi_type,
+ XFS_FSB_TO_AGBNO(tp->t_mountp, bmap->br_startblock),
+ bi->bi_owner->i_ino, bi->bi_whichfork,
+ bmap->br_startoff, bmap->br_blockcount,
+ bmap->br_state);
+
+ if (WARN_ON_ONCE(bi->bi_whichfork != XFS_DATA_FORK))
+ return -EFSCORRUPTED;
+
+ if (XFS_TEST_ERROR(false, tp->t_mountp,
+ XFS_ERRTAG_BMAP_FINISH_ONE))
+ return -EIO;
+
+ switch (bi->bi_type) {
+ case XFS_BMAP_MAP:
+ error = xfs_bmapi_remap(tp, bi->bi_owner, bmap->br_startoff,
+ bmap->br_blockcount, bmap->br_startblock, 0);
+ bmap->br_blockcount = 0;
+ break;
+ case XFS_BMAP_UNMAP:
+ error = __xfs_bunmapi(tp, bi->bi_owner, bmap->br_startoff,
+ &bmap->br_blockcount, XFS_BMAPI_REMAP, 1);
+ break;
+ default:
+ ASSERT(0);
+ error = -EFSCORRUPTED;
+ }
+
+ return error;
+}
+
+/* Check that an inode's extent does not have invalid flags or bad ranges. */
+xfs_failaddr_t
+xfs_bmap_validate_extent(
+ struct xfs_inode *ip,
+ int whichfork,
+ struct xfs_bmbt_irec *irec)
+{
+ struct xfs_mount *mp = ip->i_mount;
+
+ if (!xfs_verify_fileext(mp, irec->br_startoff, irec->br_blockcount))
+ return __this_address;
+
+ if (XFS_IS_REALTIME_INODE(ip) && whichfork == XFS_DATA_FORK) {
+ if (!xfs_verify_rtext(mp, irec->br_startblock,
+ irec->br_blockcount))
+ return __this_address;
+ } else {
+ if (!xfs_verify_fsbext(mp, irec->br_startblock,
+ irec->br_blockcount))
+ return __this_address;
+ }
+ if (irec->br_state != XFS_EXT_NORM && whichfork != XFS_DATA_FORK)
+ return __this_address;
+ return NULL;
+}
+
+int __init
+xfs_bmap_intent_init_cache(void)
+{
+ xfs_bmap_intent_cache = kmem_cache_create("xfs_bmap_intent",
+ sizeof(struct xfs_bmap_intent),
+ 0, 0, NULL);
+
+ return xfs_bmap_intent_cache != NULL ? 0 : -ENOMEM;
+}
+
+void
+xfs_bmap_intent_destroy_cache(void)
+{
+ kmem_cache_destroy(xfs_bmap_intent_cache);
+ xfs_bmap_intent_cache = NULL;
+}