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-rw-r--r--include/linux/buffer_head.h8
1 files changed, 6 insertions, 2 deletions
diff --git a/include/linux/buffer_head.h b/include/linux/buffer_head.h
index 50cfe8ceb47..eadaab44015 100644
--- a/include/linux/buffer_head.h
+++ b/include/linux/buffer_head.h
@@ -115,7 +115,6 @@ BUFFER_FNS(Uptodate, uptodate)
BUFFER_FNS(Dirty, dirty)
TAS_BUFFER_FNS(Dirty, dirty)
BUFFER_FNS(Lock, locked)
-TAS_BUFFER_FNS(Lock, locked)
BUFFER_FNS(Req, req)
TAS_BUFFER_FNS(Req, req)
BUFFER_FNS(Mapped, mapped)
@@ -321,10 +320,15 @@ static inline void wait_on_buffer(struct buffer_head *bh)
__wait_on_buffer(bh);
}
+static inline int trylock_buffer(struct buffer_head *bh)
+{
+ return likely(!test_and_set_bit(BH_Lock, &bh->b_state));
+}
+
static inline void lock_buffer(struct buffer_head *bh)
{
might_sleep();
- if (test_set_buffer_locked(bh))
+ if (!trylock_buffer(bh))
__lock_buffer(bh);
}