block: use an on-stack bio in blkdev_issue_flush

There is no point in allocating memory for a synchronous flush.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Acked-by: Damien Le Moal <damien.lemoal@wdc.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

18 files changed, 20 insertions, 20 deletions

diff --git a/fs/block_dev.c b/fs/block_dev.c
index c1fe29dac485..9d4b1a884d76 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -680,7 +680,7 @@ int blkdev_fsync(struct file *filp, loff_t start, loff_t end, int datasync)
 	 * i_mutex and doing so causes performance issues with concurrent
 	 * O_SYNC writers to a block device.
 	 */
-	error = blkdev_issue_flush(bdev, GFP_KERNEL);
+	error = blkdev_issue_flush(bdev);
 	if (error == -EOPNOTSUPP)
 		error = 0;
 
diff --git a/fs/exfat/file.c b/fs/exfat/file.c
index a92478eabfa4..183ffdf4d43c 100644
--- a/fs/exfat/file.c
+++ b/fs/exfat/file.c
@@ -361,7 +361,7 @@ int exfat_file_fsync(struct file *filp, loff_t start, loff_t end, int datasync)
 	if (err)
 		return err;
 
-	return blkdev_issue_flush(inode->i_sb->s_bdev, GFP_KERNEL);
+	return blkdev_issue_flush(inode->i_sb->s_bdev);
 }
 
 const struct file_operations exfat_file_operations = {
diff --git a/fs/ext4/fast_commit.c b/fs/ext4/fast_commit.c
index 0a14a7c87bf8..6e8208acfc62 100644
--- a/fs/ext4/fast_commit.c
+++ b/fs/ext4/fast_commit.c
@@ -1076,7 +1076,7 @@ static int ext4_fc_perform_commit(journal_t *journal)
 	 * flush before we start writing fast commit blocks.
 	 */
 	if (journal->j_fs_dev != journal->j_dev)
-		blkdev_issue_flush(journal->j_fs_dev, GFP_NOFS);
+		blkdev_issue_flush(journal->j_fs_dev);
 
 	blk_start_plug(&plug);
 	if (sbi->s_fc_bytes == 0) {
@@ -1535,7 +1535,7 @@ static int ext4_fc_replay_inode(struct super_block *sb, struct ext4_fc_tl *tl)
 out:
 	iput(inode);
 	if (!ret)
-		blkdev_issue_flush(sb->s_bdev, GFP_KERNEL);
+		blkdev_issue_flush(sb->s_bdev);
 
 	return 0;
 }
diff --git a/fs/ext4/fsync.c b/fs/ext4/fsync.c
index 113bfb023a4a..027a7d7037a0 100644
--- a/fs/ext4/fsync.c
+++ b/fs/ext4/fsync.c
@@ -174,7 +174,7 @@ int ext4_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
 		ret = ext4_fsync_journal(inode, datasync, &needs_barrier);
 
 	if (needs_barrier) {
-		err = blkdev_issue_flush(inode->i_sb->s_bdev, GFP_KERNEL);
+		err = blkdev_issue_flush(inode->i_sb->s_bdev);
 		if (!ret)
 			ret = err;
 	}
diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c
index b215c564bc31..20f2fcb799f5 100644
--- a/fs/ext4/ialloc.c
+++ b/fs/ext4/ialloc.c
@@ -1583,7 +1583,7 @@ int ext4_init_inode_table(struct super_block *sb, ext4_group_t group,
 	if (ret < 0)
 		goto err_out;
 	if (barrier)
-		blkdev_issue_flush(sb->s_bdev, GFP_NOFS);
+		blkdev_issue_flush(sb->s_bdev);
 
 skip_zeroout:
 	ext4_lock_group(sb, group);
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 9a6f9875aa34..fb5985102c1d 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -5709,7 +5709,7 @@ static int ext4_sync_fs(struct super_block *sb, int wait)
 		needs_barrier = true;
 	if (needs_barrier) {
 		int err;
-		err = blkdev_issue_flush(sb->s_bdev, GFP_KERNEL);
+		err = blkdev_issue_flush(sb->s_bdev);
 		if (!ret)
 			ret = err;
 	}
diff --git a/fs/fat/file.c b/fs/fat/file.c
index f9ee27cf4d7c..5fee74f1ad61 100644
--- a/fs/fat/file.c
+++ b/fs/fat/file.c
@@ -195,7 +195,7 @@ int fat_file_fsync(struct file *filp, loff_t start, loff_t end, int datasync)
 	if (err)
 		return err;
 
-	return blkdev_issue_flush(inode->i_sb->s_bdev, GFP_KERNEL);
+	return blkdev_issue_flush(inode->i_sb->s_bdev);
 }
 
 
diff --git a/fs/hfsplus/inode.c b/fs/hfsplus/inode.c
index e3da9e96b835..ca464328b79c 100644
--- a/fs/hfsplus/inode.c
+++ b/fs/hfsplus/inode.c
@@ -340,7 +340,7 @@ int hfsplus_file_fsync(struct file *file, loff_t start, loff_t end,
 	}
 
 	if (!test_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags))
-		blkdev_issue_flush(inode->i_sb->s_bdev, GFP_KERNEL);
+		blkdev_issue_flush(inode->i_sb->s_bdev);
 
 	inode_unlock(inode);
 
diff --git a/fs/hfsplus/super.c b/fs/hfsplus/super.c
index 807119ae5adf..b9e3db3f855f 100644
--- a/fs/hfsplus/super.c
+++ b/fs/hfsplus/super.c
@@ -239,7 +239,7 @@ out:
 	mutex_unlock(&sbi->vh_mutex);
 
 	if (!test_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags))
-		blkdev_issue_flush(sb->s_bdev, GFP_KERNEL);
+		blkdev_issue_flush(sb->s_bdev);
 
 	return error;
 }
diff --git a/fs/jbd2/checkpoint.c b/fs/jbd2/checkpoint.c
index 472932b9e6bc..63b526d44886 100644
--- a/fs/jbd2/checkpoint.c
+++ b/fs/jbd2/checkpoint.c
@@ -416,7 +416,7 @@ int jbd2_cleanup_journal_tail(journal_t *journal)
 	 * jbd2_cleanup_journal_tail() doesn't get called all that often.
 	 */
 	if (journal->j_flags & JBD2_BARRIER)
-		blkdev_issue_flush(journal->j_fs_dev, GFP_NOFS);
+		blkdev_issue_flush(journal->j_fs_dev);
 
 	return __jbd2_update_log_tail(journal, first_tid, blocknr);
 }
diff --git a/fs/jbd2/commit.c b/fs/jbd2/commit.c
index b121d7d434c6..3cc4ab2ba7f4 100644
--- a/fs/jbd2/commit.c
+++ b/fs/jbd2/commit.c
@@ -825,7 +825,7 @@ start_journal_io:
 	if (commit_transaction->t_need_data_flush &&
 	    (journal->j_fs_dev != journal->j_dev) &&
 	    (journal->j_flags & JBD2_BARRIER))
-		blkdev_issue_flush(journal->j_fs_dev, GFP_NOFS);
+		blkdev_issue_flush(journal->j_fs_dev);
 
 	/* Done it all: now write the commit record asynchronously. */
 	if (jbd2_has_feature_async_commit(journal)) {
@@ -932,7 +932,7 @@ start_journal_io:
 	stats.run.rs_blocks_logged++;
 	if (jbd2_has_feature_async_commit(journal) &&
 	    journal->j_flags & JBD2_BARRIER) {
-		blkdev_issue_flush(journal->j_dev, GFP_NOFS);
+		blkdev_issue_flush(journal->j_dev);
 	}
 
 	if (err)
diff --git a/fs/jbd2/recovery.c b/fs/jbd2/recovery.c
index dc0694fcfcd1..69f18fe20923 100644
--- a/fs/jbd2/recovery.c
+++ b/fs/jbd2/recovery.c
@@ -326,7 +326,7 @@ int jbd2_journal_recover(journal_t *journal)
 		err = err2;
 	/* Make sure all replayed data is on permanent storage */
 	if (journal->j_flags & JBD2_BARRIER) {
-		err2 = blkdev_issue_flush(journal->j_fs_dev, GFP_KERNEL);
+		err2 = blkdev_issue_flush(journal->j_fs_dev);
 		if (!err)
 			err = err2;
 	}
diff --git a/fs/libfs.c b/fs/libfs.c
index d1c3bade9f30..8398a0efb401 100644
--- a/fs/libfs.c
+++ b/fs/libfs.c
@@ -1117,7 +1117,7 @@ int generic_file_fsync(struct file *file, loff_t start, loff_t end,
 	err = __generic_file_fsync(file, start, end, datasync);
 	if (err)
 		return err;
-	return blkdev_issue_flush(inode->i_sb->s_bdev, GFP_KERNEL);
+	return blkdev_issue_flush(inode->i_sb->s_bdev);
 }
 EXPORT_SYMBOL(generic_file_fsync);
 
diff --git a/fs/nilfs2/the_nilfs.h b/fs/nilfs2/the_nilfs.h
index b55cdeb4d169..987c8ab02aee 100644
--- a/fs/nilfs2/the_nilfs.h
+++ b/fs/nilfs2/the_nilfs.h
@@ -375,7 +375,7 @@ static inline int nilfs_flush_device(struct the_nilfs *nilfs)
 	 */
 	smp_wmb();
 
-	err = blkdev_issue_flush(nilfs->ns_bdev, GFP_KERNEL);
+	err = blkdev_issue_flush(nilfs->ns_bdev);
 	if (err != -EIO)
 		err = 0;
 	return err;
diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c
index 85979e2214b3..df6d709d2ae3 100644
--- a/fs/ocfs2/file.c
+++ b/fs/ocfs2/file.c
@@ -194,7 +194,7 @@ static int ocfs2_sync_file(struct file *file, loff_t start, loff_t end,
 		needs_barrier = true;
 	err = jbd2_complete_transaction(journal, commit_tid);
 	if (needs_barrier) {
-		ret = blkdev_issue_flush(inode->i_sb->s_bdev, GFP_KERNEL);
+		ret = blkdev_issue_flush(inode->i_sb->s_bdev);
 		if (!err)
 			err = ret;
 	}
diff --git a/fs/reiserfs/file.c b/fs/reiserfs/file.c
index 0b641ae694f1..1db0254bc38b 100644
--- a/fs/reiserfs/file.c
+++ b/fs/reiserfs/file.c
@@ -159,7 +159,7 @@ static int reiserfs_sync_file(struct file *filp, loff_t start, loff_t end,
 	barrier_done = reiserfs_commit_for_inode(inode);
 	reiserfs_write_unlock(inode->i_sb);
 	if (barrier_done != 1 && reiserfs_barrier_flush(inode->i_sb))
-		blkdev_issue_flush(inode->i_sb->s_bdev, GFP_KERNEL);
+		blkdev_issue_flush(inode->i_sb->s_bdev);
 	inode_unlock(inode);
 	if (barrier_done < 0)
 		return barrier_done;
diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c
index 813be879a5e5..c3e32789829f 100644
--- a/fs/xfs/xfs_super.c
+++ b/fs/xfs/xfs_super.c
@@ -342,7 +342,7 @@ void
 xfs_blkdev_issue_flush(
 	xfs_buftarg_t		*buftarg)
 {
-	blkdev_issue_flush(buftarg->bt_bdev, GFP_NOFS);
+	blkdev_issue_flush(buftarg->bt_bdev);
 }
 
 STATIC void
diff --git a/fs/zonefs/super.c b/fs/zonefs/super.c
index faea2ed34b4a..ab68e27bb322 100644
--- a/fs/zonefs/super.c
+++ b/fs/zonefs/super.c
@@ -541,7 +541,7 @@ static int zonefs_file_fsync(struct file *file, loff_t start, loff_t end,
 	if (ZONEFS_I(inode)->i_ztype == ZONEFS_ZTYPE_CNV)
 		ret = file_write_and_wait_range(file, start, end);
 	if (!ret)
-		ret = blkdev_issue_flush(inode->i_sb->s_bdev, GFP_KERNEL);
+		ret = blkdev_issue_flush(inode->i_sb->s_bdev);
 
 	if (ret)
 		zonefs_io_error(inode, true);