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ext4: Fix duplicate entries returned from getdents() system call

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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>
This commit is contained in:
Theodore Ts'o 2008-10-25 11:39:08 -04:00
parent 8c9fa93d51
commit 3c37fc86d2
1 changed files with 8 additions and 12 deletions
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20
fs/ext4/dir.c
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@ -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;