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ext3: Fix duplicate entries returned from getdents() system call

Fix a regression caused by commit 6a897cf, "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>
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1 parent 57f8f7b commit 8c9fa93d51123c5540762b1a9e1919d6f9c4af7c @tytso tytso committed Oct 25, 2008
Showing with 8 additions and 12 deletions.
  1. +8 −12 fs/ext3/dir.c
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@@ -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;

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