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Diffstat (limited to 'fs/block_dev.c')
-rw-r--r--fs/block_dev.c34
1 files changed, 25 insertions, 9 deletions
diff --git a/fs/block_dev.c b/fs/block_dev.c
index b737451e2e9d..dea3b628a6ce 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -48,6 +48,21 @@ inline struct block_device *I_BDEV(struct inode *inode)
EXPORT_SYMBOL(I_BDEV);
+/*
+ * move the inode from it's current bdi to the a new bdi. if the inode is dirty
+ * we need to move it onto the dirty list of @dst so that the inode is always
+ * on the right list.
+ */
+static void bdev_inode_switch_bdi(struct inode *inode,
+ struct backing_dev_info *dst)
+{
+ spin_lock(&inode_lock);
+ inode->i_data.backing_dev_info = dst;
+ if (inode->i_state & I_DIRTY)
+ list_move(&inode->i_wb_list, &dst->wb.b_dirty);
+ spin_unlock(&inode_lock);
+}
+
static sector_t max_block(struct block_device *bdev)
{
sector_t retval = ~((sector_t)0);
@@ -550,7 +565,7 @@ EXPORT_SYMBOL(bdget);
*/
struct block_device *bdgrab(struct block_device *bdev)
{
- atomic_inc(&bdev->bd_inode->i_count);
+ ihold(bdev->bd_inode);
return bdev;
}
@@ -580,7 +595,7 @@ static struct block_device *bd_acquire(struct inode *inode)
spin_lock(&bdev_lock);
bdev = inode->i_bdev;
if (bdev) {
- atomic_inc(&bdev->bd_inode->i_count);
+ ihold(bdev->bd_inode);
spin_unlock(&bdev_lock);
return bdev;
}
@@ -591,12 +606,12 @@ static struct block_device *bd_acquire(struct inode *inode)
spin_lock(&bdev_lock);
if (!inode->i_bdev) {
/*
- * We take an additional bd_inode->i_count for inode,
+ * We take an additional reference to bd_inode,
* and it's released in clear_inode() of inode.
* So, we can access it via ->i_mapping always
* without igrab().
*/
- atomic_inc(&bdev->bd_inode->i_count);
+ ihold(bdev->bd_inode);
inode->i_bdev = bdev;
inode->i_mapping = bdev->bd_inode->i_mapping;
list_add(&inode->i_devices, &bdev->bd_inodes);
@@ -1390,7 +1405,7 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part)
bdi = blk_get_backing_dev_info(bdev);
if (bdi == NULL)
bdi = &default_backing_dev_info;
- bdev->bd_inode->i_data.backing_dev_info = bdi;
+ bdev_inode_switch_bdi(bdev->bd_inode, bdi);
}
if (bdev->bd_invalidated)
rescan_partitions(disk, bdev);
@@ -1405,8 +1420,8 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part)
if (ret)
goto out_clear;
bdev->bd_contains = whole;
- bdev->bd_inode->i_data.backing_dev_info =
- whole->bd_inode->i_data.backing_dev_info;
+ bdev_inode_switch_bdi(bdev->bd_inode,
+ whole->bd_inode->i_data.backing_dev_info);
bdev->bd_part = disk_get_part(disk, partno);
if (!(disk->flags & GENHD_FL_UP) ||
!bdev->bd_part || !bdev->bd_part->nr_sects) {
@@ -1439,7 +1454,7 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part)
disk_put_part(bdev->bd_part);
bdev->bd_disk = NULL;
bdev->bd_part = NULL;
- bdev->bd_inode->i_data.backing_dev_info = &default_backing_dev_info;
+ bdev_inode_switch_bdi(bdev->bd_inode, &default_backing_dev_info);
if (bdev != bdev->bd_contains)
__blkdev_put(bdev->bd_contains, mode, 1);
bdev->bd_contains = NULL;
@@ -1533,7 +1548,8 @@ static int __blkdev_put(struct block_device *bdev, fmode_t mode, int for_part)
disk_put_part(bdev->bd_part);
bdev->bd_part = NULL;
bdev->bd_disk = NULL;
- bdev->bd_inode->i_data.backing_dev_info = &default_backing_dev_info;
+ bdev_inode_switch_bdi(bdev->bd_inode,
+ &default_backing_dev_info);
if (bdev != bdev->bd_contains)
victim = bdev->bd_contains;
bdev->bd_contains = NULL;