diff options
| author | Christoph Hellwig <hch@lst.de> | 2020-11-27 16:45:27 +0100 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2020-12-01 14:53:39 -0700 |
| commit | 3a4174e68684e43ecdcb59126a441b29d5e94f7f (patch) | |
| tree | a6538a19c9bb3a47297434f2c17da51492ad3565 | |
| parent | 612c6aa7817f1c89b6a92fc724331aa7c9d77f6e (diff) | |
block: switch bdgrab to use igrab
All of the current callers already have a reference, but to prepare for
additional users ensure bdgrab returns NULL if the block device is being
freed.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
| -rw-r--r-- | fs/block_dev.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/fs/block_dev.c b/fs/block_dev.c index d707ab376da8..962fabe8a67b 100644 --- a/fs/block_dev.c +++ b/fs/block_dev.c @@ -894,10 +894,14 @@ static struct block_device *bdget(dev_t dev) /** * bdgrab -- Grab a reference to an already referenced block device * @bdev: Block device to grab a reference to. + * + * Returns the block_device with an additional reference when successful, + * or NULL if the inode is already beeing freed. */ struct block_device *bdgrab(struct block_device *bdev) { - ihold(bdev->bd_inode); + if (!igrab(bdev->bd_inode)) + return NULL; return bdev; } EXPORT_SYMBOL(bdgrab); |