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| author | Theodore Ts'o <tytso@mit.edu> | 2008-10-25 11:38:37 -0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2008-10-25 22:37:44 -0400 |
| commit | 8c9fa93d51123c5540762b1a9e1919d6f9c4af7c (patch) | |
| tree | e0c09b583c785be17bd2509b7c71fd7db3ad9aad | |
| parent | 57f8f7b60db6f1ed2c6918ab9230c4623a9dbe37 (diff) | |
| download | linux-8c9fa93d51123c5540762b1a9e1919d6f9c4af7c.tar.bz2 | |
ext3: Fix duplicate entries returned from getdents() system call
Fix a regression caused by commit 6a897cf4, "ext3: fix ext3_dx_readdir
hash collision handling", where deleting files in a large directory
(requiring more than one getdents system call), results in some
filenames being returned twice. This was caused by a failure to
update info->curr_hash and info->curr_minor_hash, so that if the
directory had gotten modified since the last getdents() system call
(as would be the case if the user is running "rm -r" or "git clean"),
a directory entry would get returned twice to the userspace.
This patch fixes the bug reported by Markus Trippelsdorf at:
http://bugzilla.kernel.org/show_bug.cgi?id=11844
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Tested-by: Markus Trippelsdorf <markus@trippelsdorf.de>
| -rw-r--r-- | fs/ext3/dir.c | 20 |
1 files changed, 8 insertions, 12 deletions
diff --git a/fs/ext3/dir.c b/fs/ext3/dir.c index 4c82531ea0a8..5853f4440af4 100644 --- a/fs/ext3/dir.c +++ b/fs/ext3/dir.c @@ -456,17 +456,8 @@ static int ext3_dx_readdir(struct file * filp, if (info->extra_fname) { if (call_filldir(filp, dirent, filldir, info->extra_fname)) goto finished; - info->extra_fname = NULL; - info->curr_node = rb_next(info->curr_node); - if (!info->curr_node) { - if (info->next_hash == ~0) { - filp->f_pos = EXT3_HTREE_EOF; - goto finished; - } - info->curr_hash = info->next_hash; - info->curr_minor_hash = 0; - } + goto next_node; } else if (!info->curr_node) info->curr_node = rb_first(&info->root); @@ -498,9 +489,14 @@ static int ext3_dx_readdir(struct file * filp, info->curr_minor_hash = fname->minor_hash; if (call_filldir(filp, dirent, filldir, fname)) break; - + next_node: info->curr_node = rb_next(info->curr_node); - if (!info->curr_node) { + if (info->curr_node) { + fname = rb_entry(info->curr_node, struct fname, + rb_hash); + info->curr_hash = fname->hash; + info->curr_minor_hash = fname->minor_hash; + } else { if (info->next_hash == ~0) { filp->f_pos = EXT3_HTREE_EOF; break; |