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

3 files changed, 11 insertions, 5 deletions

diff --git a/block/as-iosched.c b/block/as-iosched.c
index 8c3946787dbb..743f33a01a07 100644
--- 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 a073f3f4f013..0f51c0f7c266 100644
--- 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 7c1080826832..d8e2762ed14d 100644
--- 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