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authorFengguang Wu <fengguang.wu@intel.com>2012-08-09 15:23:07 +0200
committerJens Axboe <axboe@kernel.dk>2012-08-09 15:23:07 +0200
commit8430f9772f9ac305211f177b0fa56a312175da11 (patch)
tree02756ec7fd9c3f5545858dd7aa8c6da4b3e77866 /mm/filemap.c
parent276f0f5d157bb4a816053f4f3a941dbcd4f76556 (diff)
downloadlinaro-lsk-8430f9772f9ac305211f177b0fa56a312175da11.tar.gz
block: remove plugging at buffered write time
Buffered write(2) is not directly tied to IO, so it's not suitable to handle plug in generic_file_aio_write(). Note that plugging for O_SYNC writes is also removed. The user may pass arbitrary @size arguments, which may be much larger than the preferable I/O size, or may cross extent/device boundaries. Let the lower layers handle the plugging. The plugging code here actually turns them into no-ops. CC: Li Shaohua <shli@fusionio.com> Signed-off-by: Wu Fengguang <fengguang.wu@intel.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'mm/filemap.c')
-rw-r--r--mm/filemap.c3
1 files changed, 0 insertions, 3 deletions
diff --git a/mm/filemap.c b/mm/filemap.c
index fa5ca304148..2b0952974cb 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -2527,14 +2527,12 @@ ssize_t generic_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
{
struct file *file = iocb->ki_filp;
struct inode *inode = file->f_mapping->host;
- struct blk_plug plug;
ssize_t ret;
BUG_ON(iocb->ki_pos != pos);
sb_start_write(inode->i_sb);
mutex_lock(&inode->i_mutex);
- blk_start_plug(&plug);
ret = __generic_file_aio_write(iocb, iov, nr_segs, &iocb->ki_pos);
mutex_unlock(&inode->i_mutex);
@@ -2545,7 +2543,6 @@ ssize_t generic_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
if (err < 0 && ret > 0)
ret = err;
}
- blk_finish_plug(&plug);
sb_end_write(inode->i_sb);
return ret;
}