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| author | Theodore Ts'o <tytso@mit.edu> | 2008-10-25 11:39:08 -0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2008-10-25 22:37:55 -0400 |
| commit | 3c37fc86d20fe35be656f070997d62f75c2e4874 (patch) | |
| tree | eb9593356a2aa3233ab8f198f044e81413423cde /fs/ext4/dir.c | |
| parent | 8c9fa93d51123c5540762b1a9e1919d6f9c4af7c (diff) | |
| download | linux-3c37fc86d20fe35be656f070997d62f75c2e4874.tar.gz linux-3c37fc86d20fe35be656f070997d62f75c2e4874.tar.bz2 linux-3c37fc86d20fe35be656f070997d62f75c2e4874.zip | |
ext4: Fix duplicate entries returned from getdents() system call
Fix a regression caused by commit d0156417, "ext4: fix ext4_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.
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
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>
Diffstat (limited to 'fs/ext4/dir.c')
| -rw-r--r-- | fs/ext4/dir.c | 20 |
1 files changed, 8 insertions, 12 deletions
diff --git a/fs/ext4/dir.c b/fs/ext4/dir.c index 3ca6a2b7632d..fed5b610df5a 100644 --- a/fs/ext4/dir.c +++ b/fs/ext4/dir.c @@ -459,17 +459,8 @@ static int ext4_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 = EXT4_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); @@ -501,9 +492,14 @@ static int ext4_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 = EXT4_HTREE_EOF; break; |