Author: kib
Date: Thu Oct 3 19:55:05 2019
New Revision: 353065
URL: https://svnweb.freebsd.org/changeset/base/353065
Log:
tmpfs_readdir(): unlock the locked node.
During readdir() we guarantee that the tn_dir.tn_parent does not go
away, but it might be replaced by a parallel rename. Read tn_parent
only once, then use the cached value.
Reported and tested by: pho
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Modified:
head/sys/fs/tmpfs/tmpfs_subr.c
Modified: head/sys/fs/tmpfs/tmpfs_subr.c
==============================================================================
--- head/sys/fs/tmpfs/tmpfs_subr.c Thu Oct 3 19:51:56 2019
(r353064)
+++ head/sys/fs/tmpfs/tmpfs_subr.c Thu Oct 3 19:55:05 2019
(r353065)
@@ -1147,8 +1147,9 @@ static int
tmpfs_dir_getdotdotdent(struct tmpfs_mount *tm, struct tmpfs_node *node,
struct uio *uio)
{
- int error;
+ struct tmpfs_node *parent;
struct dirent dent;
+ int error;
TMPFS_VALIDATE_DIR(node);
MPASS(uio->uio_offset == TMPFS_DIRCOOKIE_DOTDOT);
@@ -1157,12 +1158,13 @@ tmpfs_dir_getdotdotdent(struct tmpfs_mount *tm, struct
* Return ENOENT if the current node is already removed.
*/
TMPFS_ASSERT_LOCKED(node);
- if (node->tn_dir.tn_parent == NULL)
+ parent = node->tn_dir.tn_parent;
+ if (parent == NULL)
return (ENOENT);
- TMPFS_NODE_LOCK(node->tn_dir.tn_parent);
- dent.d_fileno = node->tn_dir.tn_parent->tn_id;
- TMPFS_NODE_UNLOCK(node->tn_dir.tn_parent);
+ TMPFS_NODE_LOCK(parent);
+ dent.d_fileno = parent->tn_id;
+ TMPFS_NODE_UNLOCK(parent);
dent.d_type = DT_DIR;
dent.d_namlen = 2;
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