diff options
Diffstat (limited to 'fs/block_dev.c')
| -rw-r--r-- | fs/block_dev.c | 28 |
1 files changed, 20 insertions, 8 deletions
diff --git a/fs/block_dev.c b/fs/block_dev.c index c62fb84..95f786e 100644 --- a/fs/block_dev.c +++ b/fs/block_dev.c @@ -44,24 +44,28 @@ inline struct block_device *I_BDEV(struct inode *inode) { return &BDEV_I(inode)->bdev; } - 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. + * Move the inode from its current bdi to 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_wb_list_lock); + struct backing_dev_info *old = inode->i_data.backing_dev_info; + + if (unlikely(dst == old)) /* deadlock avoidance */ + return; + bdi_lock_two(&old->wb, &dst->wb); spin_lock(&inode->i_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->i_lock); - spin_unlock(&inode_wb_list_lock); + spin_unlock(&old->wb.list_lock); + spin_unlock(&dst->wb.list_lock); } static sector_t max_block(struct block_device *bdev) @@ -383,6 +387,10 @@ int blkdev_fsync(struct file *filp, loff_t start, loff_t end, int datasync) struct inode *bd_inode = filp->f_mapping->host; struct block_device *bdev = I_BDEV(bd_inode); int error; + + error = filemap_write_and_wait_range(filp->f_mapping, start, end); + if (error) + return error; /* * There is no need to serialise calls to blkdev_issue_flush with @@ -548,6 +556,7 @@ struct block_device *bdget(dev_t dev) if (inode->i_state & I_NEW) { bdev->bd_contains = NULL; + bdev->bd_super = NULL; bdev->bd_inode = inode; bdev->bd_block_size = (1 << inode->i_blkbits); bdev->bd_part_count = 0; @@ -1420,6 +1429,11 @@ static int __blkdev_put(struct block_device *bdev, fmode_t mode, int for_part) WARN_ON_ONCE(bdev->bd_holders); sync_blockdev(bdev); kill_bdev(bdev); + /* ->release can cause the old bdi to disappear, + * so must switch it out first + */ + bdev_inode_switch_bdi(bdev->bd_inode, + &default_backing_dev_info); } if (bdev->bd_contains == bdev) { if (disk->fops->release) @@ -1433,8 +1447,6 @@ 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_inode_switch_bdi(bdev->bd_inode, - &default_backing_dev_info); if (bdev != bdev->bd_contains) victim = bdev->bd_contains; bdev->bd_contains = NULL; |