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-rw-r--r--fs/xfs/xfs_attr_inactive.c391
1 files changed, 391 insertions, 0 deletions
diff --git a/fs/xfs/xfs_attr_inactive.c b/fs/xfs/xfs_attr_inactive.c
new file mode 100644
index 0000000000..89c7a9f4f9
--- /dev/null
+++ b/fs/xfs/xfs_attr_inactive.c
@@ -0,0 +1,391 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2000-2005 Silicon Graphics, Inc.
+ * Copyright (c) 2013 Red Hat, 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_mount.h"
+#include "xfs_da_format.h"
+#include "xfs_da_btree.h"
+#include "xfs_inode.h"
+#include "xfs_attr.h"
+#include "xfs_attr_remote.h"
+#include "xfs_trans.h"
+#include "xfs_bmap.h"
+#include "xfs_attr_leaf.h"
+#include "xfs_quota.h"
+#include "xfs_dir2.h"
+#include "xfs_error.h"
+
+/*
+ * Invalidate any incore buffers associated with this remote attribute value
+ * extent. We never log remote attribute value buffers, which means that they
+ * won't be attached to a transaction and are therefore safe to mark stale.
+ * The actual bunmapi will be taken care of later.
+ */
+STATIC int
+xfs_attr3_rmt_stale(
+ struct xfs_inode *dp,
+ xfs_dablk_t blkno,
+ int blkcnt)
+{
+ struct xfs_bmbt_irec map;
+ int nmap;
+ int error;
+
+ /*
+ * Roll through the "value", invalidating the attribute value's
+ * blocks.
+ */
+ while (blkcnt > 0) {
+ /*
+ * Try to remember where we decided to put the value.
+ */
+ nmap = 1;
+ error = xfs_bmapi_read(dp, (xfs_fileoff_t)blkno, blkcnt,
+ &map, &nmap, XFS_BMAPI_ATTRFORK);
+ if (error)
+ return error;
+ if (XFS_IS_CORRUPT(dp->i_mount, nmap != 1))
+ return -EFSCORRUPTED;
+
+ /*
+ * Mark any incore buffers for the remote value as stale. We
+ * never log remote attr value buffers, so the buffer should be
+ * easy to kill.
+ */
+ error = xfs_attr_rmtval_stale(dp, &map, 0);
+ if (error)
+ return error;
+
+ blkno += map.br_blockcount;
+ blkcnt -= map.br_blockcount;
+ }
+
+ return 0;
+}
+
+/*
+ * Invalidate all of the "remote" value regions pointed to by a particular
+ * leaf block.
+ * Note that we must release the lock on the buffer so that we are not
+ * caught holding something that the logging code wants to flush to disk.
+ */
+STATIC int
+xfs_attr3_leaf_inactive(
+ struct xfs_trans **trans,
+ struct xfs_inode *dp,
+ struct xfs_buf *bp)
+{
+ struct xfs_attr3_icleaf_hdr ichdr;
+ struct xfs_mount *mp = bp->b_mount;
+ struct xfs_attr_leafblock *leaf = bp->b_addr;
+ struct xfs_attr_leaf_entry *entry;
+ struct xfs_attr_leaf_name_remote *name_rmt;
+ int error = 0;
+ int i;
+
+ xfs_attr3_leaf_hdr_from_disk(mp->m_attr_geo, &ichdr, leaf);
+
+ /*
+ * Find the remote value extents for this leaf and invalidate their
+ * incore buffers.
+ */
+ entry = xfs_attr3_leaf_entryp(leaf);
+ for (i = 0; i < ichdr.count; entry++, i++) {
+ int blkcnt;
+
+ if (!entry->nameidx || (entry->flags & XFS_ATTR_LOCAL))
+ continue;
+
+ name_rmt = xfs_attr3_leaf_name_remote(leaf, i);
+ if (!name_rmt->valueblk)
+ continue;
+
+ blkcnt = xfs_attr3_rmt_blocks(dp->i_mount,
+ be32_to_cpu(name_rmt->valuelen));
+ error = xfs_attr3_rmt_stale(dp,
+ be32_to_cpu(name_rmt->valueblk), blkcnt);
+ if (error)
+ goto err;
+ }
+
+ xfs_trans_brelse(*trans, bp);
+err:
+ return error;
+}
+
+/*
+ * Recurse (gasp!) through the attribute nodes until we find leaves.
+ * We're doing a depth-first traversal in order to invalidate everything.
+ */
+STATIC int
+xfs_attr3_node_inactive(
+ struct xfs_trans **trans,
+ struct xfs_inode *dp,
+ struct xfs_buf *bp,
+ int level)
+{
+ struct xfs_mount *mp = dp->i_mount;
+ struct xfs_da_blkinfo *info;
+ xfs_dablk_t child_fsb;
+ xfs_daddr_t parent_blkno, child_blkno;
+ struct xfs_buf *child_bp;
+ struct xfs_da3_icnode_hdr ichdr;
+ int error, i;
+
+ /*
+ * Since this code is recursive (gasp!) we must protect ourselves.
+ */
+ if (level > XFS_DA_NODE_MAXDEPTH) {
+ xfs_buf_mark_corrupt(bp);
+ xfs_trans_brelse(*trans, bp); /* no locks for later trans */
+ return -EFSCORRUPTED;
+ }
+
+ xfs_da3_node_hdr_from_disk(dp->i_mount, &ichdr, bp->b_addr);
+ parent_blkno = xfs_buf_daddr(bp);
+ if (!ichdr.count) {
+ xfs_trans_brelse(*trans, bp);
+ return 0;
+ }
+ child_fsb = be32_to_cpu(ichdr.btree[0].before);
+ xfs_trans_brelse(*trans, bp); /* no locks for later trans */
+ bp = NULL;
+
+ /*
+ * If this is the node level just above the leaves, simply loop
+ * over the leaves removing all of them. If this is higher up
+ * in the tree, recurse downward.
+ */
+ for (i = 0; i < ichdr.count; i++) {
+ /*
+ * Read the subsidiary block to see what we have to work with.
+ * Don't do this in a transaction. This is a depth-first
+ * traversal of the tree so we may deal with many blocks
+ * before we come back to this one.
+ */
+ error = xfs_da3_node_read(*trans, dp, child_fsb, &child_bp,
+ XFS_ATTR_FORK);
+ if (error)
+ return error;
+
+ /* save for re-read later */
+ child_blkno = xfs_buf_daddr(child_bp);
+
+ /*
+ * Invalidate the subtree, however we have to.
+ */
+ info = child_bp->b_addr;
+ switch (info->magic) {
+ case cpu_to_be16(XFS_DA_NODE_MAGIC):
+ case cpu_to_be16(XFS_DA3_NODE_MAGIC):
+ error = xfs_attr3_node_inactive(trans, dp, child_bp,
+ level + 1);
+ break;
+ case cpu_to_be16(XFS_ATTR_LEAF_MAGIC):
+ case cpu_to_be16(XFS_ATTR3_LEAF_MAGIC):
+ error = xfs_attr3_leaf_inactive(trans, dp, child_bp);
+ break;
+ default:
+ xfs_buf_mark_corrupt(child_bp);
+ xfs_trans_brelse(*trans, child_bp);
+ error = -EFSCORRUPTED;
+ break;
+ }
+ if (error)
+ return error;
+
+ /*
+ * Remove the subsidiary block from the cache and from the log.
+ */
+ error = xfs_trans_get_buf(*trans, mp->m_ddev_targp,
+ child_blkno,
+ XFS_FSB_TO_BB(mp, mp->m_attr_geo->fsbcount), 0,
+ &child_bp);
+ if (error)
+ return error;
+ xfs_trans_binval(*trans, child_bp);
+ child_bp = NULL;
+
+ /*
+ * If we're not done, re-read the parent to get the next
+ * child block number.
+ */
+ if (i + 1 < ichdr.count) {
+ struct xfs_da3_icnode_hdr phdr;
+
+ error = xfs_da3_node_read_mapped(*trans, dp,
+ parent_blkno, &bp, XFS_ATTR_FORK);
+ if (error)
+ return error;
+ xfs_da3_node_hdr_from_disk(dp->i_mount, &phdr,
+ bp->b_addr);
+ child_fsb = be32_to_cpu(phdr.btree[i + 1].before);
+ xfs_trans_brelse(*trans, bp);
+ bp = NULL;
+ }
+ /*
+ * Atomically commit the whole invalidate stuff.
+ */
+ error = xfs_trans_roll_inode(trans, dp);
+ if (error)
+ return error;
+ }
+
+ return 0;
+}
+
+/*
+ * Indiscriminately delete the entire attribute fork
+ *
+ * Recurse (gasp!) through the attribute nodes until we find leaves.
+ * We're doing a depth-first traversal in order to invalidate everything.
+ */
+static int
+xfs_attr3_root_inactive(
+ struct xfs_trans **trans,
+ struct xfs_inode *dp)
+{
+ struct xfs_mount *mp = dp->i_mount;
+ struct xfs_da_blkinfo *info;
+ struct xfs_buf *bp;
+ xfs_daddr_t blkno;
+ int error;
+
+ /*
+ * Read block 0 to see what we have to work with.
+ * We only get here if we have extents, since we remove
+ * the extents in reverse order the extent containing
+ * block 0 must still be there.
+ */
+ error = xfs_da3_node_read(*trans, dp, 0, &bp, XFS_ATTR_FORK);
+ if (error)
+ return error;
+ blkno = xfs_buf_daddr(bp);
+
+ /*
+ * Invalidate the tree, even if the "tree" is only a single leaf block.
+ * This is a depth-first traversal!
+ */
+ info = bp->b_addr;
+ switch (info->magic) {
+ case cpu_to_be16(XFS_DA_NODE_MAGIC):
+ case cpu_to_be16(XFS_DA3_NODE_MAGIC):
+ error = xfs_attr3_node_inactive(trans, dp, bp, 1);
+ break;
+ case cpu_to_be16(XFS_ATTR_LEAF_MAGIC):
+ case cpu_to_be16(XFS_ATTR3_LEAF_MAGIC):
+ error = xfs_attr3_leaf_inactive(trans, dp, bp);
+ break;
+ default:
+ error = -EFSCORRUPTED;
+ xfs_buf_mark_corrupt(bp);
+ xfs_trans_brelse(*trans, bp);
+ break;
+ }
+ if (error)
+ return error;
+
+ /*
+ * Invalidate the incore copy of the root block.
+ */
+ error = xfs_trans_get_buf(*trans, mp->m_ddev_targp, blkno,
+ XFS_FSB_TO_BB(mp, mp->m_attr_geo->fsbcount), 0, &bp);
+ if (error)
+ return error;
+ error = bp->b_error;
+ if (error) {
+ xfs_trans_brelse(*trans, bp);
+ return error;
+ }
+ xfs_trans_binval(*trans, bp); /* remove from cache */
+ /*
+ * Commit the invalidate and start the next transaction.
+ */
+ error = xfs_trans_roll_inode(trans, dp);
+
+ return error;
+}
+
+/*
+ * xfs_attr_inactive kills all traces of an attribute fork on an inode. It
+ * removes both the on-disk and in-memory inode fork. Note that this also has to
+ * handle the condition of inodes without attributes but with an attribute fork
+ * configured, so we can't use xfs_inode_hasattr() here.
+ *
+ * The in-memory attribute fork is removed even on error.
+ */
+int
+xfs_attr_inactive(
+ struct xfs_inode *dp)
+{
+ struct xfs_trans *trans;
+ struct xfs_mount *mp;
+ int lock_mode = XFS_ILOCK_SHARED;
+ int error = 0;
+
+ mp = dp->i_mount;
+
+ xfs_ilock(dp, lock_mode);
+ if (!xfs_inode_has_attr_fork(dp))
+ goto out_destroy_fork;
+ xfs_iunlock(dp, lock_mode);
+
+ lock_mode = 0;
+
+ error = xfs_trans_alloc(mp, &M_RES(mp)->tr_attrinval, 0, 0, 0, &trans);
+ if (error)
+ goto out_destroy_fork;
+
+ lock_mode = XFS_ILOCK_EXCL;
+ xfs_ilock(dp, lock_mode);
+
+ if (!xfs_inode_has_attr_fork(dp))
+ goto out_cancel;
+
+ /*
+ * No need to make quota reservations here. We expect to release some
+ * blocks, not allocate, in the common case.
+ */
+ xfs_trans_ijoin(trans, dp, 0);
+
+ /*
+ * Invalidate and truncate the attribute fork extents. Make sure the
+ * fork actually has xattr blocks as otherwise the invalidation has no
+ * blocks to read and returns an error. In this case, just do the fork
+ * removal below.
+ */
+ if (dp->i_af.if_nextents > 0) {
+ error = xfs_attr3_root_inactive(&trans, dp);
+ if (error)
+ goto out_cancel;
+
+ error = xfs_itruncate_extents(&trans, dp, XFS_ATTR_FORK, 0);
+ if (error)
+ goto out_cancel;
+ }
+
+ /* Reset the attribute fork - this also destroys the in-core fork */
+ xfs_attr_fork_remove(dp, trans);
+
+ error = xfs_trans_commit(trans);
+ xfs_iunlock(dp, lock_mode);
+ return error;
+
+out_cancel:
+ xfs_trans_cancel(trans);
+out_destroy_fork:
+ /* kill the in-core attr fork before we drop the inode lock */
+ xfs_ifork_zap_attr(dp);
+ if (lock_mode)
+ xfs_iunlock(dp, lock_mode);
+ return error;
+}