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Commit a64c8610 authored by Theodore Ts'o's avatar Theodore Ts'o
Browse files

block_write_full_page: Use synchronous writes for WBC_SYNC_ALL writebacks 



When doing synchronous writes because wbc->sync_mode is set to
WBC_SYNC_ALL, send the write request using WRITE_SYNC, so that we
don't unduly block system calls such as fsync().

Signed-off-by: default avatar"Theodore Ts'o" <tytso@mit.edu>
Acked-by: default avatarJan Kara <jack@suse.cz>
parent 8e0ee43b

fs/buffer.c

+3 −2
Original line number Diff line number Diff line
@@ -1714,6 +1714,7 @@ static int __block_write_full_page(struct inode *inode, struct page *page, 
	struct buffer_head *bh, *head;

	const unsigned blocksize = 1 << inode->i_blkbits;

	int nr_underway = 0;

	int write_op = (wbc->sync_mode == WB_SYNC_ALL ? WRITE_SYNC : WRITE);



	BUG_ON(!PageLocked(page));
@@ -1805,7 +1806,7 @@ static int __block_write_full_page(struct inode *inode, struct page *page, 
	do {

		struct buffer_head *next = bh->b_this_page;

		if (buffer_async_write(bh)) {

			submit_bh(WRITE, bh);

			submit_bh(write_op, bh);

			nr_underway++;

		}

		bh = next;
@@ -1859,7 +1860,7 @@ static int __block_write_full_page(struct inode *inode, struct page *page, 
		struct buffer_head *next = bh->b_this_page;

		if (buffer_async_write(bh)) {

			clear_buffer_dirty(bh);

			submit_bh(WRITE, bh);

			submit_bh(write_op, bh);

			nr_underway++;

		}

		bh = next;