path: root/fs/autofs4/autofs_i.h
diff options
authorAl Viro <viro@zeniv.linux.org.uk>2016-06-12 11:24:46 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2016-06-12 11:24:46 -0400
commitea01a18494b3d7a91b2f1f2a6a5aaef4741bc294 (patch)
tree58b50373b64652941796b5b7e03416dd632f4ef8 /fs/autofs4/autofs_i.h
parentmuch milder d_walk() race (diff)
autofs races
* make autofs4_expire_indirect() skip the dentries being in process of expiry * do *not* mess with list_move(); making sure that dentry with AUTOFS_INF_EXPIRING are not picked for expiry is enough. * do not remove NO_RCU when we set EXPIRING, don't bother with smp_mb() there. Clear it at the same time we clear EXPIRING. Makes a bunch of tests simpler. * rename NO_RCU to WANT_EXPIRE, which is what it really is. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/autofs4/autofs_i.h')
1 files changed, 6 insertions, 2 deletions
diff --git a/fs/autofs4/autofs_i.h b/fs/autofs4/autofs_i.h
index f0d268b97d19..a439548de785 100644
--- a/fs/autofs4/autofs_i.h
+++ b/fs/autofs4/autofs_i.h
@@ -70,9 +70,13 @@ struct autofs_info {
#define AUTOFS_INF_EXPIRING (1<<0) /* dentry in the process of expiring */
-#define AUTOFS_INF_NO_RCU (1<<1) /* the dentry is being considered
+#define AUTOFS_INF_WANT_EXPIRE (1<<1) /* the dentry is being considered
* for expiry, so RCU_walk is
- * not permitted
+ * not permitted. If it progresses to
+ * actual expiry attempt, the flag is
+ * not cleared when EXPIRING is set -
+ * in that case it gets cleared only
+ * when it comes to clearing EXPIRING.
#define AUTOFS_INF_PENDING (1<<2) /* dentry pending mount */