diff options
Diffstat (limited to 'fs/xfs/libxfs/xfs_bmap.c')
| -rw-r--r-- | fs/xfs/libxfs/xfs_bmap.c | 6230 |
1 files changed, 6230 insertions, 0 deletions
diff --git a/fs/xfs/libxfs/xfs_bmap.c b/fs/xfs/libxfs/xfs_bmap.c new file mode 100644 index 000000000..49d0d4ea6 --- /dev/null +++ b/fs/xfs/libxfs/xfs_bmap.c @@ -0,0 +1,6230 @@ +// 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); + xfs_free_extent_later(cur->bc_tp, cbno, 1, &oinfo); + 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); + if (tp->t_firstblock == NULLFSBLOCK) { + args.type = XFS_ALLOCTYPE_START_BNO; + args.fsbno = XFS_INO_TO_FSB(mp, ip->i_ino); + } else if (tp->t_flags & XFS_TRANS_LOWMODE) { + args.type = XFS_ALLOCTYPE_START_BNO; + args.fsbno = tp->t_firstblock; + } else { + args.type = XFS_ALLOCTYPE_NEAR_BNO; + args.fsbno = tp->t_firstblock; + } + args.minlen = args.maxlen = args.prod = 1; + args.wasdel = wasdel; + *logflagsp = 0; + error = xfs_alloc_vextent(&args); + if (error) + goto out_root_realloc; + + if (WARN_ON_ONCE(args.fsbno == NULLFSBLOCK)) { + error = -ENOSPC; + goto out_root_realloc; + } + + /* + * Allocation can't fail, the space was reserved. + */ + ASSERT(tp->t_firstblock == NULLFSBLOCK || + args.agno >= XFS_FSB_TO_AGNO(mp, tp->t_firstblock)); + tp->t_firstblock = args.fsbno; + 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; + 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. + */ + if (tp->t_firstblock == NULLFSBLOCK) { + args.fsbno = XFS_INO_TO_FSB(args.mp, ip->i_ino); + args.type = XFS_ALLOCTYPE_START_BNO; + } else { + args.fsbno = tp->t_firstblock; + args.type = XFS_ALLOCTYPE_NEAR_BNO; + } + args.total = total; + args.minlen = args.maxlen = args.prod = 1; + error = xfs_alloc_vextent(&args); + if (error) + goto done; + + /* Can't fail, the space was reserved. */ + ASSERT(args.fsbno != NULLFSBLOCK); + ASSERT(args.len == 1); + tp->t_firstblock = args.fsbno; + 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; +}; + +/* 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 -EFSCORRUPTED; + } + 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)); + 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_agnumber_t fb_agno; /* ag number of ap->firstblock */ + xfs_mount_t *mp; /* mount point structure */ + int nullfb; /* true if ap->firstblock isn't set */ + 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; + nullfb = ap->tp->t_firstblock == NULLFSBLOCK; + rt = XFS_IS_REALTIME_INODE(ap->ip) && + (ap->datatype & XFS_ALLOC_USERDATA); + fb_agno = nullfb ? NULLAGNUMBER : XFS_FSB_TO_AGNO(mp, + ap->tp->t_firstblock); + /* + * 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; + /* + * If the firstblock forbids it, can't use it, + * must use default. + */ + if (!rt && !nullfb && + XFS_FSB_TO_AGNO(mp, prevbno) != fb_agno) + prevbno = NULLFSBLOCK; + } + /* + * 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; + /* + * If the firstblock forbids it, can't use it, + * must use default. + */ + if (!rt && !nullfb && + XFS_FSB_TO_AGNO(mp, gotbno) != fb_agno) + gotbno = NULLFSBLOCK; + } + /* + * 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 +} + +static int +xfs_bmap_longest_free_extent( + struct xfs_trans *tp, + xfs_agnumber_t ag, + xfs_extlen_t *blen, + int *notinit) +{ + struct xfs_mount *mp = tp->t_mountp; + struct xfs_perag *pag; + xfs_extlen_t longest; + int error = 0; + + pag = xfs_perag_get(mp, ag); + if (!pag->pagf_init) { + error = xfs_alloc_read_agf(pag, tp, XFS_ALLOC_FLAG_TRYLOCK, + NULL); + if (error) { + /* Couldn't lock the AGF, so skip this AG. */ + if (error == -EAGAIN) { + *notinit = 1; + error = 0; + } + goto out; + } + } + + longest = xfs_alloc_longest_free_extent(pag, + xfs_alloc_min_freelist(mp, pag), + xfs_ag_resv_needed(pag, XFS_AG_RESV_NONE)); + if (*blen < longest) + *blen = longest; + +out: + xfs_perag_put(pag); + return error; +} + +static void +xfs_bmap_select_minlen( + struct xfs_bmalloca *ap, + struct xfs_alloc_arg *args, + xfs_extlen_t *blen, + int notinit) +{ + if (notinit || *blen < ap->minlen) { + /* + * Since we did a BUF_TRYLOCK above, it is possible that + * there is space for this request. + */ + args->minlen = ap->minlen; + } else if (*blen < args->maxlen) { + /* + * If the best seen length is less than the request length, + * use the best as the minimum. + */ + args->minlen = *blen; + } else { + /* + * Otherwise we've seen an extent as big as maxlen, use that + * as the minimum. + */ + args->minlen = args->maxlen; + } +} + +STATIC int +xfs_bmap_btalloc_nullfb( + struct xfs_bmalloca *ap, + struct xfs_alloc_arg *args, + xfs_extlen_t *blen) +{ + struct xfs_mount *mp = ap->ip->i_mount; + xfs_agnumber_t ag, startag; + int notinit = 0; + int error; + + args->type = XFS_ALLOCTYPE_START_BNO; + args->total = ap->total; + + startag = ag = XFS_FSB_TO_AGNO(mp, args->fsbno); + if (startag == NULLAGNUMBER) + startag = ag = 0; + + while (*blen < args->maxlen) { + error = xfs_bmap_longest_free_extent(args->tp, ag, blen, + ¬init); + if (error) + return error; + + if (++ag == mp->m_sb.sb_agcount) + ag = 0; + if (ag == startag) + break; + } + + xfs_bmap_select_minlen(ap, args, blen, notinit); + return 0; +} + +STATIC int +xfs_bmap_btalloc_filestreams( + struct xfs_bmalloca *ap, + struct xfs_alloc_arg *args, + xfs_extlen_t *blen) +{ + struct xfs_mount *mp = ap->ip->i_mount; + xfs_agnumber_t ag; + int notinit = 0; + int error; + + args->type = XFS_ALLOCTYPE_NEAR_BNO; + args->total = ap->total; + + ag = XFS_FSB_TO_AGNO(mp, args->fsbno); + if (ag == NULLAGNUMBER) + ag = 0; + + error = xfs_bmap_longest_free_extent(args->tp, ag, blen, ¬init); + if (error) + return error; + + if (*blen < args->maxlen) { + error = xfs_filestream_new_ag(ap, &ag); + if (error) + return error; + + error = xfs_bmap_longest_free_extent(args->tp, ag, blen, + ¬init); + if (error) + return error; + + } + + xfs_bmap_select_minlen(ap, args, blen, notinit); + + /* + * Set the failure fallback case to look in the selected AG as stream + * may have moved. + */ + ap->blkno = args->fsbno = XFS_AGB_TO_FSB(mp, ag, 0); + return 0; +} + +/* 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) +{ + int nullfb; + + nullfb = ap->tp->t_firstblock == NULLFSBLOCK; + + /* + * check the allocation happened at the same or higher AG than + * the first block that was allocated. + */ + ASSERT(nullfb || + XFS_FSB_TO_AGNO(args->mp, ap->tp->t_firstblock) <= + XFS_FSB_TO_AGNO(args->mp, args->fsbno)); + + ap->blkno = args->fsbno; + if (nullfb) + ap->tp->t_firstblock = 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); + + if (ap->tp->t_firstblock == NULLFSBLOCK) { + /* + * 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); + } else { + ap->blkno = ap->tp->t_firstblock; + } + + args.fsbno = ap->blkno; + args.oinfo = XFS_RMAP_OINFO_SKIP_UPDATE; + args.type = XFS_ALLOCTYPE_FIRST_AG; + 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(&args); + 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 + +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 }; + xfs_alloctype_t atype = 0; + xfs_agnumber_t fb_agno; /* ag number of ap->firstblock */ + xfs_agnumber_t ag; + xfs_fileoff_t orig_offset; + xfs_extlen_t orig_length; + xfs_extlen_t blen; + xfs_extlen_t nextminlen = 0; + int nullfb; /* true if ap->firstblock isn't set */ + int isaligned; + int tryagain; + int error; + int stripe_align; + + ASSERT(ap->length); + orig_offset = ap->offset; + orig_length = ap->length; + + stripe_align = xfs_bmap_compute_alignments(ap, &args); + + nullfb = ap->tp->t_firstblock == NULLFSBLOCK; + fb_agno = nullfb ? NULLAGNUMBER : XFS_FSB_TO_AGNO(mp, + ap->tp->t_firstblock); + if (nullfb) { + if ((ap->datatype & XFS_ALLOC_USERDATA) && + xfs_inode_is_filestream(ap->ip)) { + ag = xfs_filestream_lookup_ag(ap->ip); + ag = (ag != NULLAGNUMBER) ? ag : 0; + ap->blkno = XFS_AGB_TO_FSB(mp, ag, 0); + } else { + ap->blkno = XFS_INO_TO_FSB(mp, ap->ip->i_ino); + } + } else + ap->blkno = ap->tp->t_firstblock; + + xfs_bmap_adjacent(ap); + + /* + * If allowed, use ap->blkno; otherwise must use firstblock since + * it's in the right allocation group. + */ + if (nullfb || XFS_FSB_TO_AGNO(mp, ap->blkno) == fb_agno) + ; + else + ap->blkno = ap->tp->t_firstblock; + /* + * Normal allocation, done through xfs_alloc_vextent. + */ + tryagain = isaligned = 0; + args.fsbno = ap->blkno; + args.oinfo = XFS_RMAP_OINFO_SKIP_UPDATE; + + /* Trim the allocation back to the maximum an AG can fit. */ + args.maxlen = min(ap->length, mp->m_ag_max_usable); + blen = 0; + if (nullfb) { + /* + * 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. + */ + if ((ap->datatype & XFS_ALLOC_USERDATA) && + xfs_inode_is_filestream(ap->ip)) + error = xfs_bmap_btalloc_filestreams(ap, &args, &blen); + else + error = xfs_bmap_btalloc_nullfb(ap, &args, &blen); + if (error) + return error; + } else if (ap->tp->t_flags & XFS_TRANS_LOWMODE) { + if (xfs_inode_is_filestream(ap->ip)) + args.type = XFS_ALLOCTYPE_FIRST_AG; + else + args.type = XFS_ALLOCTYPE_START_BNO; + args.total = args.minlen = ap->minlen; + } else { + args.type = XFS_ALLOCTYPE_NEAR_BNO; + args.total = ap->total; + args.minlen = ap->minlen; + } + + /* + * If we are not low on available data blocks, and the underlying + * logical volume manager is a stripe, and the file offset is zero then + * try to allocate data blocks on stripe unit boundary. NOTE: ap->aeof + * is only set if the allocation length is >= the stripe unit and the + * allocation offset is at the end of file. + */ + if (!(ap->tp->t_flags & XFS_TRANS_LOWMODE) && ap->aeof) { + if (!ap->offset) { + args.alignment = stripe_align; + atype = args.type; + isaligned = 1; + /* + * Adjust minlen to try and preserve alignment if we + * can't guarantee an aligned maxlen extent. + */ + if (blen > args.alignment && + blen <= args.maxlen + args.alignment) + args.minlen = blen - args.alignment; + args.minalignslop = 0; + } else { + /* + * First try an exact bno allocation. + * If it fails then do a near or start bno + * allocation with alignment turned on. + */ + atype = args.type; + tryagain = 1; + args.type = XFS_ALLOCTYPE_THIS_BNO; + args.alignment = 1; + /* + * 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. + */ + 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; + } + } else { + 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(&args); + if (error) + return error; + + if (tryagain && args.fsbno == NULLFSBLOCK) { + /* + * Exact allocation failed. Now try with alignment + * turned on. + */ + args.type = atype; + args.fsbno = ap->blkno; + args.alignment = stripe_align; + args.minlen = nextminlen; + args.minalignslop = 0; + isaligned = 1; + if ((error = xfs_alloc_vextent(&args))) + return error; + } + if (isaligned && args.fsbno == NULLFSBLOCK) { + /* + * allocation failed, so turn off alignment and + * try again. + */ + args.type = atype; + args.fsbno = ap->blkno; + args.alignment = 0; + if ((error = xfs_alloc_vextent(&args))) + return error; + } + if (args.fsbno == NULLFSBLOCK && nullfb && + args.minlen > ap->minlen) { + args.minlen = ap->minlen; + args.type = XFS_ALLOCTYPE_START_BNO; + args.fsbno = ap->blkno; + if ((error = xfs_alloc_vextent(&args))) + return error; + } + if (args.fsbno == NULLFSBLOCK && nullfb) { + args.fsbno = 0; + args.type = XFS_ALLOCTYPE_FIRST_AG; + args.total = ap->minlen; + if ((error = xfs_alloc_vextent(&args))) + return error; + ap->tp->t_flags |= XFS_TRANS_LOWMODE; + } + + 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) { + 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; +} + +static inline 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_firstblock != NULLFSBLOCK) + 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); + *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); + *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 { + __xfs_free_extent_later(tp, del->br_startblock, + del->br_blockcount, NULL, + (bflags & XFS_BMAPI_NODISCARD) || + del->br_state == XFS_EXT_UNWRITTEN); + } + } + + /* + * 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_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_inode *ip, + enum xfs_bmap_intent_type type, + int whichfork, + xfs_fileoff_t startoff, + xfs_fsblock_t startblock, + xfs_filblks_t *blockcount, + xfs_exntst_t state) +{ + int error = 0; + + ASSERT(tp->t_firstblock == NULLFSBLOCK); + + trace_xfs_bmap_deferred(tp->t_mountp, + XFS_FSB_TO_AGNO(tp->t_mountp, startblock), type, + XFS_FSB_TO_AGBNO(tp->t_mountp, startblock), + ip->i_ino, whichfork, startoff, *blockcount, state); + + if (WARN_ON_ONCE(whichfork != XFS_DATA_FORK)) + return -EFSCORRUPTED; + + if (XFS_TEST_ERROR(false, tp->t_mountp, + XFS_ERRTAG_BMAP_FINISH_ONE)) + return -EIO; + + switch (type) { + case XFS_BMAP_MAP: + error = xfs_bmapi_remap(tp, ip, startoff, *blockcount, + startblock, 0); + *blockcount = 0; + break; + case XFS_BMAP_UNMAP: + error = __xfs_bunmapi(tp, ip, startoff, 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; +} |