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authorJens Axboe <jaxboe@fusionio.com>2011-03-09 11:56:30 +0100
committerJens Axboe <jaxboe@fusionio.com>2011-03-10 08:52:27 +0100
commit721a9602e6607417c6bc15b18e97a2f35266c690 (patch)
tree4987991e43f35b8b3b685fea0040c5265b578996 /fs/buffer.c
parentcf15900e1209d5b46ec2d24643adbf561830935f (diff)
block: kill off REQ_UNPLUG
With the plugging now being explicitly controlled by the submitter, callers need not pass down unplugging hints to the block layer. If they want to unplug, it's because they manually plugged on their own - in which case, they should just unplug at will. Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
Diffstat (limited to 'fs/buffer.c')
-rw-r--r--fs/buffer.c14
1 files changed, 4 insertions, 10 deletions
diff --git a/fs/buffer.c b/fs/buffer.c
index f903f2e5b4fe..42534f67d71b 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -767,7 +767,7 @@ static int fsync_buffers_list(spinlock_t *lock, struct list_head *list)
* still in flight on potentially older
* contents.
*/
- write_dirty_buffer(bh, WRITE_SYNC_PLUG);
+ write_dirty_buffer(bh, WRITE_SYNC);
/*
* Kick off IO for the previous mapping. Note
@@ -1602,14 +1602,8 @@ EXPORT_SYMBOL(unmap_underlying_metadata);
* prevents this contention from occurring.
*
* If block_write_full_page() is called with wbc->sync_mode ==
- * WB_SYNC_ALL, the writes are posted using WRITE_SYNC_PLUG; this
- * causes the writes to be flagged as synchronous writes, but the
- * block device queue will NOT be unplugged, since usually many pages
- * will be pushed to the out before the higher-level caller actually
- * waits for the writes to be completed. The various wait functions,
- * such as wait_on_writeback_range() will ultimately call sync_page()
- * which will ultimately call blk_run_backing_dev(), which will end up
- * unplugging the device queue.
+ * WB_SYNC_ALL, the writes are posted using WRITE_SYNC; this
+ * causes the writes to be flagged as synchronous writes.
*/
static int __block_write_full_page(struct inode *inode, struct page *page,
get_block_t *get_block, struct writeback_control *wbc,
@@ -1622,7 +1616,7 @@ static int __block_write_full_page(struct inode *inode, struct page *page,
const unsigned blocksize = 1 << inode->i_blkbits;
int nr_underway = 0;
int write_op = (wbc->sync_mode == WB_SYNC_ALL ?
- WRITE_SYNC_PLUG : WRITE);
+ WRITE_SYNC : WRITE);
BUG_ON(!PageLocked(page));