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Merge branch 'for-2.6.26' of git://git.kernel.dk/linux-2.6-block

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* 'for-2.6.26' of git://git.kernel.dk/linux-2.6-block:
  Properly notify block layer of sync writes
  block: Fix the starving writes bug in the anticipatory IO scheduler
This commit is contained in:
Linus Torvalds 2008-07-02 19:25:36 -07:00
commit 0e77a07ff9
3 changed files with 11 additions and 5 deletions
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2
block/as-iosched.c
View file

@ -831,6 +831,8 @@ static void as_completed_request(struct request_queue *q, struct request *rq)
}
if (ad->changed_batch && ad->nr_dispatched == 1) {
ad->current_batch_expires = jiffies +
ad->batch_expire[ad->batch_data_dir];
kblockd_schedule_work(&ad->antic_work);
ad->changed_batch = 0;

13
fs/buffer.c
View file

@ -821,7 +821,7 @@ static int fsync_buffers_list(spinlock_t *lock, struct list_head *list)
* contents - it is a noop if I/O is still in
* flight on potentially older contents.
*/
ll_rw_block(SWRITE, 1, &bh);
ll_rw_block(SWRITE_SYNC, 1, &bh);
brelse(bh);
spin_lock(lock);
}
@ -2940,16 +2940,19 @@ void ll_rw_block(int rw, int nr, struct buffer_head *bhs[])
for (i = 0; i < nr; i++) {
struct buffer_head *bh = bhs[i];
if (rw == SWRITE)
if (rw == SWRITE || rw == SWRITE_SYNC)
lock_buffer(bh);
else if (test_set_buffer_locked(bh))
continue;
if (rw == WRITE || rw == SWRITE) {
if (rw == WRITE || rw == SWRITE || rw == SWRITE_SYNC) {
if (test_clear_buffer_dirty(bh)) {
bh->b_end_io = end_buffer_write_sync;
get_bh(bh);
submit_bh(WRITE, bh);
if (rw == SWRITE_SYNC)
submit_bh(WRITE_SYNC, bh);
else
submit_bh(WRITE, bh);
continue;
}
} else {
@ -2978,7 +2981,7 @@ int sync_dirty_buffer(struct buffer_head *bh)
if (test_clear_buffer_dirty(bh)) {
get_bh(bh);
bh->b_end_io = end_buffer_write_sync;
ret = submit_bh(WRITE, bh);
ret = submit_bh(WRITE_SYNC, bh);
wait_on_buffer(bh);
if (buffer_eopnotsupp(bh)) {
clear_buffer_eopnotsupp(bh);

1
include/linux/fs.h
View file

@ -83,6 +83,7 @@ extern int dir_notify_enable;
#define READ_SYNC (READ | (1 << BIO_RW_SYNC))
#define READ_META (READ | (1 << BIO_RW_META))
#define WRITE_SYNC (WRITE | (1 << BIO_RW_SYNC))
#define SWRITE_SYNC (SWRITE | (1 << BIO_RW_SYNC))
#define WRITE_BARRIER ((1 << BIO_RW) | (1 << BIO_RW_BARRIER))
#define SEL_IN 1