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xfs: remove b_last_holder & associated macros 

The old lock tracking infrastructure in xfs using the b_last_holder
field seems to only be useful if you can get into the system with a
debugger; it seems that the existing tracepoints would be the way to
go these days, and this old infrastructure can be removed.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
This commit is contained in:
Eric Sandeen 2018-08-10 13:56:25 -07:00 committed by Darrick J. Wong
parent 10259de1d8
commit fa6c668d80
3 changed files with 2 additions and 23 deletions
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1
fs/xfs/xfs.h
View File

@ -8,7 +8,6 @@
#ifdef CONFIG_XFS_DEBUG
#define DEBUG 1
#define XFS_BUF_LOCK_TRACKING 1
#endif
#ifdef CONFIG_XFS_ASSERT_FATAL

20
fs/xfs/xfs_buf.c
View File

@ -34,16 +34,6 @@
static kmem_zone_t *xfs_buf_zone;
#ifdef XFS_BUF_LOCK_TRACKING
# define XB_SET_OWNER(bp) ((bp)->b_last_holder = current->pid)
# define XB_CLEAR_OWNER(bp) ((bp)->b_last_holder = -1)
# define XB_GET_OWNER(bp) ((bp)->b_last_holder)
#else
# define XB_SET_OWNER(bp) do { } while (0)
# define XB_CLEAR_OWNER(bp) do { } while (0)
# define XB_GET_OWNER(bp) do { } while (0)
#endif
#define xb_to_gfp(flags) \
((((flags) & XBF_READ_AHEAD) ? __GFP_NORETRY : GFP_NOFS) | __GFP_NOWARN)
@ -226,7 +216,6 @@ _xfs_buf_alloc(
INIT_LIST_HEAD(&bp->b_li_list);
sema_init(&bp->b_sema, 0); /* held, no waiters */
spin_lock_init(&bp->b_lock);
XB_SET_OWNER(bp);
bp->b_target = target;
bp->b_flags = flags;
@ -1091,12 +1080,10 @@ xfs_buf_trylock(
int locked;
locked = down_trylock(&bp->b_sema) == 0;
if (locked) {
XB_SET_OWNER(bp);
if (locked)
trace_xfs_buf_trylock(bp, _RET_IP_);
} else {
else
trace_xfs_buf_trylock_fail(bp, _RET_IP_);
}
return locked;
}
@ -1118,7 +1105,6 @@ xfs_buf_lock(
if (atomic_read(&bp->b_pin_count) && (bp->b_flags & XBF_STALE))
xfs_log_force(bp->b_target->bt_mount, 0);
down(&bp->b_sema);
XB_SET_OWNER(bp);
trace_xfs_buf_lock_done(bp, _RET_IP_);
}
@ -1129,9 +1115,7 @@ xfs_buf_unlock(
{
ASSERT(xfs_buf_islocked(bp));
XB_CLEAR_OWNER(bp);
up(&bp->b_sema);
trace_xfs_buf_unlock(bp, _RET_IP_);
}

4
fs/xfs/xfs_buf.h
View File

@ -198,10 +198,6 @@ typedef struct xfs_buf {
int b_last_error;
const struct xfs_buf_ops *b_ops;
#ifdef XFS_BUF_LOCK_TRACKING
int b_last_holder;
#endif
} xfs_buf_t;
/* Finding and Reading Buffers */