Commit 332d2f06 authored by Andrew Morton's avatar Andrew Morton Committed by Linus Torvalds

[PATCH] Fix ext3_dx_readdir

When there are more than one entry in fname linked list, the current
implementation of ext3_dx_readdir() can not traverse all entries correctly
in the case that call_filldir() fails.

If we use system call readdir() to read entries in a directory which
happens that "." and ".." in the same fname linked list.  Each time we call
readdir(), it will return the "." entry and never returns 0 which indicates
that all entries are read.

Although chances that more than one entry are in one fname linked list are
very slim, it does exist.
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 22d1d71a
......@@ -418,7 +418,7 @@ 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;
......@@ -457,9 +457,12 @@ 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->extra_fname) {
if(call_filldir(filp, dirent, filldir, info->extra_fname))
goto finished;
else
goto next_entry;
}
if (!info->curr_node)
info->curr_node = rb_first(&info->root);
......@@ -492,7 +495,7 @@ static int ext3_dx_readdir(struct file * filp,
info->curr_minor_hash = fname->minor_hash;
if (call_filldir(filp, dirent, filldir, fname))
break;
next_entry:
info->curr_node = rb_next(info->curr_node);
if (!info->curr_node) {
if (info->next_hash == ~0) {
......
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