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

* '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

diff --git a/block/as-iosched.c b/block/as-iosched.c
index 8c39467..743f33a 100644 (file)
--- a/block/as-iosched.c
+++ b/block/as-iosched.c
@@ -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;
 

diff --git a/fs/buffer.c b/fs/buffer.c
index a073f3f..0f51c0f 100644 (file)
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -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);

diff --git a/include/linux/fs.h b/include/linux/fs.h
index 7c10808..d8e2762 100644 (file)
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -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