On Sat 01-06-13 19:06:54, Jonghwan Choi wrote:
> From: Jeff Mahoney <[email protected]>
>
> This patch looks like it should be in the 3.9-stable tree, should we apply
> it?
Yes, please do. Thanks.
Honza
>
> ------------------
>
> From: "Jeff Mahoney <[email protected]>"
>
> commit 0bdc7acba56a7ca4232f15f37b16f7ec079385ab upstream
>
> After sleeping for filldir(), we check to see if the file system has
> changed and research. The next_pos pointer is updated but its value
> isn't pushed into the key used for the search itself. As a result,
> the search returns the same item that the last cycle of the loop did
> and filldir() is called multiple times with the same data.
>
> The end result is that the buffer can contain the same name multiple
> times. This can be returned to userspace or used internally in the
> xattr code where it can manifest with the following warning:
>
> jdm-20004 reiserfs_delete_xattrs: Couldn't delete all xattrs (-2)
>
> reiserfs_for_each_xattr uses reiserfs_readdir_dentry to iterate over
> the xattr names and ends up trying to unlink the same name twice. The
> second attempt fails with -ENOENT and the error is returned. At some
> point I'll need to add support into reiserfsck to remove the orphaned
> directories left behind when this occurs.
>
> The fix is to push the value into the key before researching.
>
> Signed-off-by: Jeff Mahoney <[email protected]>
> Signed-off-by: Jan Kara <[email protected]>
> Signed-off-by: Jonghwan Choi <[email protected]>
> ---
> fs/reiserfs/dir.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/fs/reiserfs/dir.c b/fs/reiserfs/dir.c
> index 66c53b6..6c2d136 100644
> --- a/fs/reiserfs/dir.c
> +++ b/fs/reiserfs/dir.c
> @@ -204,6 +204,8 @@ int reiserfs_readdir_dentry(struct dentry *dentry, void
> *dirent,
> next_pos = deh_offset(deh) + 1;
>
> if (item_moved(&tmp_ih, &path_to_entry)) {
> + set_cpu_key_k_offset(&pos_key,
> + next_pos);
> goto research;
> }
> } /* for */
> --
> 1.8.1.2
>
--
Jan Kara <[email protected]>
SUSE Labs, CR
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