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fs/block_dev.c: Remove WARN_ON() when inode writeback fails

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If a block device is hot removed and later last reference to device
is put, we try to writeback the dirty inode. But device is gone and
that writeback fails.

Currently we do a WARN_ON() which does not seem to be the right thing.
Convert it to a ratelimited kernel warning.

Reported-by: Andi Kleen <andi@firstfloor.org>
Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
Acked-by: Tejun Heo <tj@kernel.org>
[jmoyer@redhat.com: get rid of unnecessary name initialization, 80 cols]
Signed-off-by: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Vivek Goyal 2015-11-09 09:23:40 -07:00 committed by Jens Axboe
parent c74dc7801d
commit dbd3ca5075
1 changed files with 12 additions and 3 deletions
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15
fs/block_dev.c
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@ -50,12 +50,21 @@ struct block_device *I_BDEV(struct inode *inode)
} }
EXPORT_SYMBOL(I_BDEV); EXPORT_SYMBOL(I_BDEV);
static void bdev_write_inode(struct inode *inode) static void bdev_write_inode(struct block_device *bdev)
{ {
struct inode *inode = bdev->bd_inode;
int ret;
spin_lock(&inode->i_lock); spin_lock(&inode->i_lock);
while (inode->i_state & I_DIRTY) { while (inode->i_state & I_DIRTY) {
spin_unlock(&inode->i_lock); spin_unlock(&inode->i_lock);
WARN_ON_ONCE(write_inode_now(inode, true)); ret = write_inode_now(inode, true);
if (ret) {
char name[BDEVNAME_SIZE];
pr_warn_ratelimited("VFS: Dirty inode writeback failed "
"for block device %s (err=%d).\n",
bdevname(bdev, name), ret);
}
spin_lock(&inode->i_lock); spin_lock(&inode->i_lock);
} }
spin_unlock(&inode->i_lock); spin_unlock(&inode->i_lock);
@ -1504,7 +1513,7 @@ static void __blkdev_put(struct block_device *bdev, fmode_t mode, int for_part)
* ->release can cause the queue to disappear, so flush all * ->release can cause the queue to disappear, so flush all
* dirty data before. * dirty data before.
*/ */
bdev_write_inode(bdev->bd_inode); bdev_write_inode(bdev);
} }
if (bdev->bd_contains == bdev) { if (bdev->bd_contains == bdev) {
if (disk->fops->release) if (disk->fops->release)