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: "Theodore Ts'o" <tytso@mit.edu> Acked-by: Jan Kara <jack@suse.cz>
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@ -1714,6 +1714,7 @@ static int __block_write_full_page(struct inode *inode, struct page *page,
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struct buffer_head *bh, *head;
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struct buffer_head *bh, *head;
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const unsigned blocksize = 1 << inode->i_blkbits;
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const unsigned blocksize = 1 << inode->i_blkbits;
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int nr_underway = 0;
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int nr_underway = 0;
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int write_op = (wbc->sync_mode == WB_SYNC_ALL ? WRITE_SYNC : WRITE);
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BUG_ON(!PageLocked(page));
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BUG_ON(!PageLocked(page));
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@ -1805,7 +1806,7 @@ static int __block_write_full_page(struct inode *inode, struct page *page,
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do {
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do {
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struct buffer_head *next = bh->b_this_page;
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struct buffer_head *next = bh->b_this_page;
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if (buffer_async_write(bh)) {
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if (buffer_async_write(bh)) {
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submit_bh(WRITE, bh);
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submit_bh(write_op, bh);
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nr_underway++;
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nr_underway++;
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}
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}
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bh = next;
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bh = next;
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@ -1859,7 +1860,7 @@ static int __block_write_full_page(struct inode *inode, struct page *page,
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struct buffer_head *next = bh->b_this_page;
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struct buffer_head *next = bh->b_this_page;
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if (buffer_async_write(bh)) {
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if (buffer_async_write(bh)) {
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clear_buffer_dirty(bh);
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clear_buffer_dirty(bh);
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submit_bh(WRITE, bh);
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submit_bh(write_op, bh);
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nr_underway++;
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nr_underway++;
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}
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}
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bh = next;
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bh = next;
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