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authorFrederic Weisbecker <fweisbec@gmail.com>2009-12-30 03:20:19 +0100
committerFrederic Weisbecker <fweisbec@gmail.com>2010-01-02 01:54:37 +0100
commitc4a62ca362258d98f42efb282cfbf9b61caffdbe (patch)
tree017484107efa26789ddd96579fcef09d874333c0 /fs/reiserfs
parent0719d3434747889b314a1e8add776418c4148bcf (diff)
downloadlinux-c4a62ca362258d98f42efb282cfbf9b61caffdbe.tar.bz2
reiserfs: Warn on lock relax if taken recursively
When we relax the reiserfs lock to avoid creating unwanted dependencies against others locks while grabbing these, we want to ensure it has not been taken recursively, otherwise the lock won't be really relaxed. Only its depth will be decreased. The unwanted dependency would then actually happen. To prevent from that, add a reiserfs_lock_check_recursive() call in the places that need it. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Alexander Beregalov <a.beregalov@gmail.com> Cc: Chris Mason <chris.mason@oracle.com> Cc: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'fs/reiserfs')
-rw-r--r--fs/reiserfs/lock.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/fs/reiserfs/lock.c b/fs/reiserfs/lock.c
index ee2cfc0fd8a7..b87aa2c1afc1 100644
--- a/fs/reiserfs/lock.c
+++ b/fs/reiserfs/lock.c
@@ -86,3 +86,12 @@ void reiserfs_check_lock_depth(struct super_block *sb, char *caller)
reiserfs_panic(sb, "%s called without kernel lock held %d",
caller);
}
+
+#ifdef CONFIG_REISERFS_CHECK
+void reiserfs_lock_check_recursive(struct super_block *sb)
+{
+ struct reiserfs_sb_info *sb_i = REISERFS_SB(sb);
+
+ WARN_ONCE((sb_i->lock_depth > 0), "Unwanted recursive reiserfs lock!\n");
+}
+#endif