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authorTheodore Ts'o <tytso@mit.edu>2008-10-25 11:39:08 -0400
committerTheodore Ts'o <tytso@mit.edu>2008-10-25 22:37:55 -0400
commit3c37fc86d20fe35be656f070997d62f75c2e4874 (patch)
treeeb9593356a2aa3233ab8f198f044e81413423cde /fs/ext4/dir.c
parent8c9fa93d51123c5540762b1a9e1919d6f9c4af7c (diff)
downloadlinux-linaro-3c37fc86d20fe35be656f070997d62f75c2e4874.tar.gz
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.c20
1 files changed, 8 insertions, 12 deletions
diff --git a/fs/ext4/dir.c b/fs/ext4/dir.c
index 3ca6a2b7632..fed5b610df5 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;