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ocfs2: make direntry invalid when deleting it 

When we deleting a direntry from a directory, if it's the first in a block we
invalid it by setting inode to 0; otherwise, we merge the deleted one to the
prior and contiguous direntry. And we don't truncate directories.

There is a problem for the later case since inode is not set to 0.
This problem happens when the caller passes a file position as parameter to
ocfs2_dir_foreach_blk(). If the position happens to point to a stale(not
the first, deleted in betweens of ocfs2_dir_foreach_blk()s) direntry, we are
not able to recognize its staleness. So that we treat it as a live one wrongly.

The fix is to set inode to 0 in both cases indicating the direntry is stale.
This won't introduce additional IOs.

Signed-off-by: Wengang Wang <wen.gang.wang@oracle.com>
Signed-off-by: Joel Becker <jlbec@evilplan.org>
This commit is contained in:
Wengang Wang 2011-07-12 16:43:14 +08:00 committed by Joel Becker
parent fc9f899483
commit 8298524803
1 changed files with 1 additions and 2 deletions
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3
fs/ocfs2/dir.c
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@ -1184,8 +1184,7 @@ static int __ocfs2_delete_entry(handle_t *handle, struct inode *dir,
if (pde)
le16_add_cpu(&pde->rec_len,
le16_to_cpu(de->rec_len));
else
de->inode = 0;
de->inode = 0;
dir->i_version++;
ocfs2_journal_dirty(handle, bh);
goto bail;