[PATCH 2/9] xfs: xfs_buf_ioend and xfs_buf_iodone_work duplicate functionality

Dave Chinner
2014-08-15T06:39:17Z

From: Dave Chinner <dchinner@redhat.com>

We do some work in xfs_buf_ioend, and some work in
xfs_buf_iodone_work, but much of that functionality is the same.
This work can all be done in a single function, leaving
xfs_buf_iodone just a wrapper to determine if we should execute it
by workqueue or directly. hence rename xfs_buf_iodone_work to
xfs_buf_ioend(), and add a new xfs_buf_ioend_async() for places that
need async processing.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
---
fs/xfs/xfs_buf.c | 79 +++++++++++++++++++++---------------------------
fs/xfs/xfs_buf.h | 2 +-
fs/xfs/xfs_buf_item.c | 4 +--
fs/xfs/xfs_inode.c | 2 +-
fs/xfs/xfs_log.c | 2 +-
fs/xfs/xfs_log_recover.c | 2 +-
6 files changed, 40 insertions(+), 51 deletions(-)

diff --git a/fs/xfs/xfs_buf.c b/fs/xfs/xfs_buf.c
index 5d86bbd..1b7f0bc 100644
--- a/fs/xfs/xfs_buf.c
+++ b/fs/xfs/xfs_buf.c
@@ -999,54 +999,49 @@ xfs_buf_wait_unpin(
*/

STATIC void
-xfs_buf_iodone_work(
- struct work_struct *work)
+xfs_buf_ioend(
+ struct xfs_buf *bp)
{
- struct xfs_buf *bp =
- container_of(work, xfs_buf_t, b_iodone_work);
- bool read = !!(bp->b_flags & XBF_READ);
+ bool read = !!(bp->b_flags & XBF_READ);
+
+ trace_xfs_buf_iodone(bp, _RET_IP_);

bp->b_flags &= ~(XBF_READ | XBF_WRITE | XBF_READ_AHEAD);

- /* only validate buffers that were read without errors */
- if (read && bp->b_ops && !bp->b_error && (bp->b_flags & XBF_DONE))
- bp->b_ops->verify_read(bp);
+ if (!bp->b_error) {
+ bp->b_flags |= XBF_DONE;
+
+ /* only validate buffers that were read without errors */
+ if (read && bp->b_ops)
+ bp->b_ops->verify_read(bp);
+ }

if (bp->b_iodone)
(*(bp->b_iodone))(bp);
else if (bp->b_flags & XBF_ASYNC)
xfs_buf_relse(bp);
else {
- ASSERT(read && bp->b_ops);
complete(&bp->b_iowait);
xfs_buf_rele(bp);
}
}

-void
-xfs_buf_ioend(
- struct xfs_buf *bp,
- int schedule)
+static void
+xfs_buf_ioend_work(
+ struct work_struct *work)
{
- bool read = !!(bp->b_flags & XBF_READ);
-
- trace_xfs_buf_iodone(bp, _RET_IP_);
+ struct xfs_buf *bp =
+ container_of(work, xfs_buf_t, b_iodone_work);

- if (bp->b_error == 0)
- bp->b_flags |= XBF_DONE;
+ xfs_buf_ioend(bp);
+}

- if (bp->b_iodone || (read && bp->b_ops) || (bp->b_flags & XBF_ASYNC)) {
- if (schedule) {
- INIT_WORK(&bp->b_iodone_work, xfs_buf_iodone_work);
- queue_work(xfslogd_workqueue, &bp->b_iodone_work);
- } else {
- xfs_buf_iodone_work(&bp->b_iodone_work);
- }
- } else {
- bp->b_flags &= ~(XBF_READ | XBF_WRITE | XBF_READ_AHEAD);
- complete(&bp->b_iowait);
- xfs_buf_rele(bp);
- }
+void
+xfs_buf_ioend_async(
+ struct xfs_buf *bp)
+{
+ INIT_WORK(&bp->b_iodone_work, xfs_buf_ioend_work);
+ queue_work(xfslogd_workqueue, &bp->b_iodone_work);
}

void
@@ -1094,7 +1089,7 @@ xfs_bioerror(
XFS_BUF_UNDONE(bp);
xfs_buf_stale(bp);

- xfs_buf_ioend(bp, 0);
+ xfs_buf_ioend(bp);

return -EIO;
}
@@ -1181,15 +1176,6 @@ xfs_bwrite(
}

STATIC void
-_xfs_buf_ioend(
- xfs_buf_t *bp,
- int schedule)
-{
- if (atomic_dec_and_test(&bp->b_io_remaining) == 1)
- xfs_buf_ioend(bp, schedule);
-}
-
-STATIC void
xfs_buf_bio_end_io(
struct bio *bio,
int error)
@@ -1206,7 +1192,8 @@ xfs_buf_bio_end_io(
if (!bp->b_error && xfs_buf_is_vmapped(bp) && (bp->b_flags & XBF_READ))
invalidate_kernel_vmap_range(bp->b_addr, xfs_buf_vmap_len(bp));

- _xfs_buf_ioend(bp, 1);
+ if (atomic_dec_and_test(&bp->b_io_remaining) == 1)
+ xfs_buf_ioend_async(bp);
bio_put(bio);
}

@@ -1425,10 +1412,12 @@ xfs_buf_iorequest(
* waiting, and in the synchronous IO case it avoids unnecessary context
* switches an latency for high-peformance devices.
*/
- if (bp->b_error || !(bp->b_flags & XBF_ASYNC))
- _xfs_buf_ioend(bp, 0);
- else
- _xfs_buf_ioend(bp, 1);
+ if (atomic_dec_and_test(&bp->b_io_remaining) == 1) {
+ if (bp->b_error || !(bp->b_flags & XBF_ASYNC))
+ xfs_buf_ioend(bp);
+ else
+ xfs_buf_ioend_async(bp);
+ }

xfs_buf_rele(bp);
}
diff --git a/fs/xfs/xfs_buf.h b/fs/xfs/xfs_buf.h
index c753183..4585c15 100644
--- a/fs/xfs/xfs_buf.h
+++ b/fs/xfs/xfs_buf.h
@@ -286,7 +286,7 @@ extern void xfs_buf_unlock(xfs_buf_t *);

/* Buffer Read and Write Routines */
extern int xfs_bwrite(struct xfs_buf *bp);
-extern void xfs_buf_ioend(xfs_buf_t *, int);
+extern void xfs_buf_ioend(struct xfs_buf *bp);
extern void xfs_buf_ioerror(xfs_buf_t *, int);
extern void xfs_buf_ioerror_alert(struct xfs_buf *, const char *func);
extern void xfs_buf_iorequest(xfs_buf_t *);
diff --git a/fs/xfs/xfs_buf_item.c b/fs/xfs/xfs_buf_item.c
index 76007de..4fd41b5 100644
--- a/fs/xfs/xfs_buf_item.c
+++ b/fs/xfs/xfs_buf_item.c
@@ -491,7 +491,7 @@ xfs_buf_item_unpin(
xfs_buf_ioerror(bp, -EIO);
XFS_BUF_UNDONE(bp);
xfs_buf_stale(bp);
- xfs_buf_ioend(bp, 0);
+ xfs_buf_ioend(bp);
}
}

@@ -1115,7 +1115,7 @@ do_callbacks:
xfs_buf_do_callbacks(bp);
bp->b_fspriv = NULL;
bp->b_iodone = NULL;
- xfs_buf_ioend(bp, 0);
+ xfs_buf_ioend(bp);
}

/*
diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
index fea3c92..00d210b 100644
--- a/fs/xfs/xfs_inode.c
+++ b/fs/xfs/xfs_inode.c
@@ -3056,7 +3056,7 @@ cluster_corrupt_out:
XFS_BUF_UNDONE(bp);
xfs_buf_stale(bp);
xfs_buf_ioerror(bp, -EIO);
- xfs_buf_ioend(bp, 0);
+ xfs_buf_ioend(bp);
} else {
xfs_buf_stale(bp);
xfs_buf_relse(bp);
diff --git a/fs/xfs/xfs_log.c b/fs/xfs/xfs_log.c
index 8eaa8f5..e4665db 100644
--- a/fs/xfs/xfs_log.c
+++ b/fs/xfs/xfs_log.c
@@ -1689,7 +1689,7 @@ xlog_bdstrat(
if (iclog->ic_state & XLOG_STATE_IOERROR) {
xfs_buf_ioerror(bp, -EIO);
xfs_buf_stale(bp);
- xfs_buf_ioend(bp, 0);
+ xfs_buf_ioend(bp);
/*
* It would seem logical to return EIO here, but we rely on
* the log state machine to propagate I/O errors instead of
diff --git a/fs/xfs/xfs_log_recover.c b/fs/xfs/xfs_log_recover.c
index 1fd5787..4ba19bf 100644
--- a/fs/xfs/xfs_log_recover.c
+++ b/fs/xfs/xfs_log_recover.c
@@ -383,7 +383,7 @@ xlog_recover_iodone(
SHUTDOWN_META_IO_ERROR);
}
bp->b_iodone = NULL;
- xfs_buf_ioend(bp, 0);
+ xfs_buf_ioend(bp);
}

/*
--
2.0.0