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authorMiklos Szeredi <mszeredi@suse.cz>2012-09-18 00:31:38 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2012-09-18 22:23:51 +0400
commitb161dfa6937ae46d50adce8a7c6b12233e96e7bd (patch)
tree51ca2936e508c2c0f4a330c6dfdb1535a26eb6f9 /include/linux/dcache.h
parent4651afbbae968772efd6dc4ba461cba9b49bb9d8 (diff)
downloadlinux-b161dfa6937ae46d50adce8a7c6b12233e96e7bd.tar.xz
vfs: dcache: use DCACHE_DENTRY_KILLED instead of DCACHE_DISCONNECTED in d_kill()
IBM reported a soft lockup after applying the fix for the rename_lock deadlock. Commit c83ce989cb5f ("VFS: Fix the nfs sillyrename regression in kernel 2.6.38") was found to be the culprit. The nfs sillyrename fix used DCACHE_DISCONNECTED to indicate that the dentry was killed. This flag can be set on non-killed dentries too, which results in infinite retries when trying to traverse the dentry tree. This patch introduces a separate flag: DCACHE_DENTRY_KILLED, which is only set in d_kill() and makes try_to_ascend() test only this flag. IBM reported successful test results with this patch. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Cc: Trond Myklebust <Trond.Myklebust@netapp.com> Cc: stable@vger.kernel.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/dcache.h')
-rw-r--r--include/linux/dcache.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/dcache.h b/include/linux/dcache.h
index caa34e50537e..59200795482e 100644
--- a/include/linux/dcache.h
+++ b/include/linux/dcache.h
@@ -206,6 +206,8 @@ struct dentry_operations {
#define DCACHE_MANAGED_DENTRY \
(DCACHE_MOUNTED|DCACHE_NEED_AUTOMOUNT|DCACHE_MANAGE_TRANSIT)
+#define DCACHE_DENTRY_KILLED 0x100000
+
extern seqlock_t rename_lock;
static inline int dname_external(struct dentry *dentry)