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-rw-r--r--xlators/storage/posix/src/posix.c19
1 files changed, 17 insertions, 2 deletions
diff --git a/xlators/storage/posix/src/posix.c b/xlators/storage/posix/src/posix.c
index ecb1b84..57cdbc9 100644
--- a/xlators/storage/posix/src/posix.c
+++ b/xlators/storage/posix/src/posix.c
@@ -3854,8 +3854,23 @@ posix_do_readdir (call_frame_t *frame, xlator_t *this,
*/
ret = dict_get_int32 (dict, GF_READDIR_SKIP_DIRS, &skip_dirs);
- count = posix_fill_readdir (fd, dir, off, size, &entries, this,
- skip_dirs);
+ LOCK (&fd->lock);
+ {
+ /* posix_fill_readdir performs multiple separate individual
+ readdir() calls to fill up the buffer.
+
+ In case of NFS where the same anonymous FD is shared between
+ different applications, reading a common directory can
+ result in the anonymous fd getting re-used unsafely between
+ the two readdir requests (in two different io-threads).
+
+ It would also help, in the future, to replace the loop
+ around readdir() with a single large getdents() call.
+ */
+ count = posix_fill_readdir (fd, dir, off, size, &entries, this,
+ skip_dirs);
+ }
+ UNLOCK (&fd->lock);
/* pick ENOENT to indicate EOF */
op_errno = errno;