xfs: clean up buffer locking helpers
Rename xfs_buf_cond_lock and reverse it's return value to fit most other
trylock operations in the Kernel and XFS (with the exception of down_trylock,
after which xfs_buf_cond_lock was modelled), and replace xfs_buf_lock_val
with an xfs_buf_islocked for use in asserts, or and opencoded variant in
tracing. remove the XFS_BUF_* wrappers for all the locking helpers.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Alex Elder <aelder@sgi.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
diff --git a/fs/xfs/linux-2.6/xfs_buf.c b/fs/xfs/linux-2.6/xfs_buf.c
index 5e68099..c772276 100644
--- a/fs/xfs/linux-2.6/xfs_buf.c
+++ b/fs/xfs/linux-2.6/xfs_buf.c
@@ -499,16 +499,14 @@
spin_unlock(&pag->pag_buf_lock);
xfs_perag_put(pag);
- if (xfs_buf_cond_lock(bp)) {
- /* failed, so wait for the lock if requested. */
- if (!(flags & XBF_TRYLOCK)) {
- xfs_buf_lock(bp);
- XFS_STATS_INC(xb_get_locked_waited);
- } else {
+ if (!xfs_buf_trylock(bp)) {
+ if (flags & XBF_TRYLOCK) {
xfs_buf_rele(bp);
XFS_STATS_INC(xb_busy_locked);
return NULL;
}
+ xfs_buf_lock(bp);
+ XFS_STATS_INC(xb_get_locked_waited);
}
/*
@@ -896,8 +894,8 @@
* to push on stale inode buffers.
*/
int
-xfs_buf_cond_lock(
- xfs_buf_t *bp)
+xfs_buf_trylock(
+ struct xfs_buf *bp)
{
int locked;
@@ -907,15 +905,8 @@
else if (atomic_read(&bp->b_pin_count) && (bp->b_flags & XBF_STALE))
xfs_log_force(bp->b_target->bt_mount, 0);
- trace_xfs_buf_cond_lock(bp, _RET_IP_);
- return locked ? 0 : -EBUSY;
-}
-
-int
-xfs_buf_lock_value(
- xfs_buf_t *bp)
-{
- return bp->b_sema.count;
+ trace_xfs_buf_trylock(bp, _RET_IP_);
+ return locked;
}
/*
@@ -929,7 +920,7 @@
*/
void
xfs_buf_lock(
- xfs_buf_t *bp)
+ struct xfs_buf *bp)
{
trace_xfs_buf_lock(bp, _RET_IP_);
@@ -950,7 +941,7 @@
*/
void
xfs_buf_unlock(
- xfs_buf_t *bp)
+ struct xfs_buf *bp)
{
if ((bp->b_flags & (XBF_DELWRI|_XBF_DELWRI_Q)) == XBF_DELWRI) {
atomic_inc(&bp->b_hold);
@@ -1694,7 +1685,7 @@
list_for_each_entry_safe(bp, n, dwq, b_list) {
ASSERT(bp->b_flags & XBF_DELWRI);
- if (!XFS_BUF_ISPINNED(bp) && !xfs_buf_cond_lock(bp)) {
+ if (!XFS_BUF_ISPINNED(bp) && xfs_buf_trylock(bp)) {
if (!force &&
time_before(jiffies, bp->b_queuetime + age)) {
xfs_buf_unlock(bp);
diff --git a/fs/xfs/linux-2.6/xfs_buf.h b/fs/xfs/linux-2.6/xfs_buf.h
index 6847dc4..706c400 100644
--- a/fs/xfs/linux-2.6/xfs_buf.h
+++ b/fs/xfs/linux-2.6/xfs_buf.h
@@ -187,10 +187,11 @@
extern void xfs_buf_rele(xfs_buf_t *);
/* Locking and Unlocking Buffers */
-extern int xfs_buf_cond_lock(xfs_buf_t *);
-extern int xfs_buf_lock_value(xfs_buf_t *);
+extern int xfs_buf_trylock(xfs_buf_t *);
extern void xfs_buf_lock(xfs_buf_t *);
extern void xfs_buf_unlock(xfs_buf_t *);
+#define xfs_buf_islocked(bp) \
+ ((bp)->b_sema.count <= 0)
/* Buffer Read and Write Routines */
extern int xfs_bwrite(struct xfs_mount *mp, struct xfs_buf *bp);
@@ -308,10 +309,6 @@
#define XFS_BUF_ISPINNED(bp) atomic_read(&((bp)->b_pin_count))
-#define XFS_BUF_VALUSEMA(bp) xfs_buf_lock_value(bp)
-#define XFS_BUF_CPSEMA(bp) (xfs_buf_cond_lock(bp) == 0)
-#define XFS_BUF_VSEMA(bp) xfs_buf_unlock(bp)
-#define XFS_BUF_PSEMA(bp,x) xfs_buf_lock(bp)
#define XFS_BUF_FINISH_IOWAIT(bp) complete(&bp->b_iowait);
#define XFS_BUF_SET_TARGET(bp, target) ((bp)->b_target = (target))
diff --git a/fs/xfs/linux-2.6/xfs_trace.h b/fs/xfs/linux-2.6/xfs_trace.h
index 4fe53f9..3bdfcb9 100644
--- a/fs/xfs/linux-2.6/xfs_trace.h
+++ b/fs/xfs/linux-2.6/xfs_trace.h
@@ -293,7 +293,7 @@
__entry->buffer_length = bp->b_buffer_length;
__entry->hold = atomic_read(&bp->b_hold);
__entry->pincount = atomic_read(&bp->b_pin_count);
- __entry->lockval = xfs_buf_lock_value(bp);
+ __entry->lockval = bp->b_sema.count;
__entry->flags = bp->b_flags;
__entry->caller_ip = caller_ip;
),
@@ -323,7 +323,7 @@
DEFINE_BUF_EVENT(xfs_buf_bdwrite);
DEFINE_BUF_EVENT(xfs_buf_lock);
DEFINE_BUF_EVENT(xfs_buf_lock_done);
-DEFINE_BUF_EVENT(xfs_buf_cond_lock);
+DEFINE_BUF_EVENT(xfs_buf_trylock);
DEFINE_BUF_EVENT(xfs_buf_unlock);
DEFINE_BUF_EVENT(xfs_buf_iowait);
DEFINE_BUF_EVENT(xfs_buf_iowait_done);
@@ -366,7 +366,7 @@
__entry->flags = flags;
__entry->hold = atomic_read(&bp->b_hold);
__entry->pincount = atomic_read(&bp->b_pin_count);
- __entry->lockval = xfs_buf_lock_value(bp);
+ __entry->lockval = bp->b_sema.count;
__entry->caller_ip = caller_ip;
),
TP_printk("dev %d:%d bno 0x%llx len 0x%zx hold %d pincount %d "
@@ -409,7 +409,7 @@
__entry->buffer_length = bp->b_buffer_length;
__entry->hold = atomic_read(&bp->b_hold);
__entry->pincount = atomic_read(&bp->b_pin_count);
- __entry->lockval = xfs_buf_lock_value(bp);
+ __entry->lockval = bp->b_sema.count;
__entry->error = error;
__entry->flags = bp->b_flags;
__entry->caller_ip = caller_ip;
@@ -454,7 +454,7 @@
__entry->buf_flags = bip->bli_buf->b_flags;
__entry->buf_hold = atomic_read(&bip->bli_buf->b_hold);
__entry->buf_pincount = atomic_read(&bip->bli_buf->b_pin_count);
- __entry->buf_lockval = xfs_buf_lock_value(bip->bli_buf);
+ __entry->buf_lockval = bip->bli_buf->b_sema.count;
__entry->li_desc = bip->bli_item.li_desc;
__entry->li_flags = bip->bli_item.li_flags;
),