diff options
| author | Jeff Mahoney <jeffm@suse.com> | 2014-04-02 14:40:26 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-05-06 07:51:44 -0700 |
| commit | 15e5f90c0f1d3f597981ffe18112aae9421f57c0 (patch) | |
| tree | 7b23c1679b69ac6d3b79da9aec33ecfcfe828c48 | |
| parent | 86455b800f7544e239b2fa5a16962ea780a1e9d8 (diff) | |
reiserfs: fix race in readdir
commit 01d8885785a60ae8f4c37b0ed75bdc96d0fc6a44 upstream.
jdm-20004 reiserfs_delete_xattrs: Couldn't delete all xattrs (-2)
The -ENOENT is due to readdir calling dir_emit on the same entry twice.
If the dir_emit callback sleeps and the tree is changed underneath us,
we won't be able to trust deh_offset(deh) anymore. We need to save
next_pos before we might sleep so we can find the next entry.
Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | fs/reiserfs/dir.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/fs/reiserfs/dir.c b/fs/reiserfs/dir.c index 66c53b642a88..7c431ed5cc79 100644 --- a/fs/reiserfs/dir.c +++ b/fs/reiserfs/dir.c @@ -128,6 +128,7 @@ int reiserfs_readdir_dentry(struct dentry *dentry, void *dirent, char *d_name; off_t d_off; ino_t d_ino; + loff_t cur_pos = deh_offset(deh); if (!de_visible(deh)) /* it is hidden entry */ @@ -200,8 +201,9 @@ int reiserfs_readdir_dentry(struct dentry *dentry, void *dirent, if (local_buf != small_buf) { kfree(local_buf); } - // next entry should be looked for with such offset - next_pos = deh_offset(deh) + 1; + + /* deh_offset(deh) may be invalid now. */ + next_pos = cur_pos + 1; if (item_moved(&tmp_ih, &path_to_entry)) { goto research; |