Merge git://oss.sgi.com:8090/oss/git/xfs-2.6

[mirror_ubuntu-artful-kernel.git] / fs / buffer.c

diff --git a/fs/buffer.c b/fs/buffer.c
index 5e4a90ee103f5eacedc1f8acaafacb847f56b5ec..0d6ca7bac6c8b9af3e77bd8cd5dc953992592419 100644 (file)
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -201,7 +201,7 @@ int fsync_bdev(struct block_device *bdev)
  * freeze_bdev  --  lock a filesystem and force it into a consistent state
  * @bdev:      blockdevice to lock
  *
- * This takes the block device bd_mount_sem to make sure no new mounts
+ * This takes the block device bd_mount_mutex to make sure no new mounts
  * happen on bdev until thaw_bdev() is called.
  * If a superblock is found on this device, we take the s_umount semaphore
  * on it to make sure nobody unmounts until the snapshot creation is done.
@@ -210,7 +210,7 @@ struct super_block *freeze_bdev(struct block_device *bdev)
 {
        struct super_block *sb;
 
-       down(&bdev->bd_mount_sem);
+       mutex_lock(&bdev->bd_mount_mutex);
        sb = get_super(bdev);
        if (sb && !(sb->s_flags & MS_RDONLY)) {
                sb->s_frozen = SB_FREEZE_WRITE;
@@ -264,7 +264,7 @@ void thaw_bdev(struct block_device *bdev, struct super_block *sb)
                drop_super(sb);
        }
 
-       up(&bdev->bd_mount_sem);
+       mutex_unlock(&bdev->bd_mount_mutex);
 }
 EXPORT_SYMBOL(thaw_bdev);
 
@@ -2867,22 +2867,22 @@ void ll_rw_block(int rw, int nr, struct buffer_head *bhs[])
                else if (test_set_buffer_locked(bh))
                        continue;
 
-               get_bh(bh);
                if (rw == WRITE || rw == SWRITE) {
                        if (test_clear_buffer_dirty(bh)) {
                                bh->b_end_io = end_buffer_write_sync;
+                               get_bh(bh);
                                submit_bh(WRITE, bh);
                                continue;
                        }
                } else {
                        if (!buffer_uptodate(bh)) {
                                bh->b_end_io = end_buffer_read_sync;
+                               get_bh(bh);
                                submit_bh(rw, bh);
                                continue;
                        }
                }
                unlock_buffer(bh);
-               put_bh(bh);
        }
 }
 
@@ -3050,66 +3050,6 @@ asmlinkage long sys_bdflush(int func, long data)
        return 0;
 }
 
-/*
- * Migration function for pages with buffers. This function can only be used
- * if the underlying filesystem guarantees that no other references to "page"
- * exist.
- */
-#ifdef CONFIG_MIGRATION
-int buffer_migrate_page(struct page *newpage, struct page *page)
-{
-       struct address_space *mapping = page->mapping;
-       struct buffer_head *bh, *head;
-
-       if (!mapping)
-               return -EAGAIN;
-
-       if (!page_has_buffers(page))
-               return migrate_page(newpage, page);
-
-       head = page_buffers(page);
-
-       if (migrate_page_remove_references(newpage, page, 3))
-               return -EAGAIN;
-
-       bh = head;
-       do {
-               get_bh(bh);
-               lock_buffer(bh);
-               bh = bh->b_this_page;
-
-       } while (bh != head);
-
-       ClearPagePrivate(page);
-       set_page_private(newpage, page_private(page));
-       set_page_private(page, 0);
-       put_page(page);
-       get_page(newpage);
-
-       bh = head;
-       do {
-               set_bh_page(bh, newpage, bh_offset(bh));
-               bh = bh->b_this_page;
-
-       } while (bh != head);
-
-       SetPagePrivate(newpage);
-
-       migrate_page_copy(newpage, page);
-
-       bh = head;
-       do {
-               unlock_buffer(bh);
-               put_bh(bh);
-               bh = bh->b_this_page;
-
-       } while (bh != head);
-
-       return 0;
-}
-EXPORT_SYMBOL(buffer_migrate_page);
-#endif
-
 /*
  * Buffer-head allocation
  */