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Subject[PATCH 1/4] ext3: Fix ext3_dx_readdir hash collision handling
Date
This fixes a bug where readdir() would return a directory entry twice
if there was a hash collision in an hash tree indexed directory.

Signed-off-by: Eugene Dashevsky <eugene@ibrix.com>
Signed-off-by: Mike Snitzer <msnitzer@ibrix.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Cc: linux-ext4@vger.kernel.org
---
fs/ext3/dir.c | 22 ++++++++++++++++------
1 files changed, 16 insertions(+), 6 deletions(-)

diff --git a/fs/ext3/dir.c b/fs/ext3/dir.c
index 2eea96e..42c5391 100644
--- a/fs/ext3/dir.c
+++ b/fs/ext3/dir.c
@@ -410,7 +410,7 @@ static int call_filldir(struct file * filp, void * dirent,
get_dtype(sb, fname->file_type));
if (error) {
filp->f_pos = curr_pos;
- info->extra_fname = fname->next;
+ info->extra_fname = fname;
return error;
}
fname = fname->next;
@@ -449,11 +449,21 @@ static int ext3_dx_readdir(struct file * filp,
* If there are any leftover names on the hash collision
* chain, return them first.
*/
- if (info->extra_fname &&
- call_filldir(filp, dirent, filldir, info->extra_fname))
- goto finished;
-
- if (!info->curr_node)
+ 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;
+ }
+ } else if (!info->curr_node)
info->curr_node = rb_first(&info->root);

while (1) {
--
1.5.6.1.205.ge2c7.dirty


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