提交 8c9fa93d 编写于 作者: T Theodore Ts'o

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

Fix a regression caused by commit 6a897cf4, "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=11844Signed-off-by: N"Theodore Ts'o" <tytso@mit.edu>
Tested-by: NMarkus Trippelsdorf <markus@trippelsdorf.de>
上级 57f8f7b6
...@@ -456,17 +456,8 @@ static int ext3_dx_readdir(struct file * filp, ...@@ -456,17 +456,8 @@ static int ext3_dx_readdir(struct file * filp,
if (info->extra_fname) { if (info->extra_fname) {
if (call_filldir(filp, dirent, filldir, info->extra_fname)) if (call_filldir(filp, dirent, filldir, info->extra_fname))
goto finished; goto finished;
info->extra_fname = NULL; info->extra_fname = NULL;
info->curr_node = rb_next(info->curr_node); goto next_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) } else if (!info->curr_node)
info->curr_node = rb_first(&info->root); info->curr_node = rb_first(&info->root);
...@@ -498,9 +489,14 @@ static int ext3_dx_readdir(struct file * filp, ...@@ -498,9 +489,14 @@ static int ext3_dx_readdir(struct file * filp,
info->curr_minor_hash = fname->minor_hash; info->curr_minor_hash = fname->minor_hash;
if (call_filldir(filp, dirent, filldir, fname)) if (call_filldir(filp, dirent, filldir, fname))
break; break;
next_node:
info->curr_node = rb_next(info->curr_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) { if (info->next_hash == ~0) {
filp->f_pos = EXT3_HTREE_EOF; filp->f_pos = EXT3_HTREE_EOF;
break; break;
......
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