diff options
| author | Mike Snitzer <snitzer@redhat.com> | 2016-10-25 08:46:23 -0600 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2016-10-25 11:55:25 -0600 |
| commit | ff26956875c2f05e12ecec9938411a2c7dfc767d (patch) | |
| tree | a2c977c066b96b721399b917d5ce5b1974d9a65a /drivers/block/brd.c | |
| parent | 366f4aea649a65c3735d91b4409d84c771811290 (diff) | |
brd: remove support for BLKFLSBUF
Discontinue having the brd driver destructively free all pages in the
ramdisk in response to the BLKFLSBUF ioctl. Doing so allows a BLKFLSBUF
ioctl issued to a logical partition to destroy pages of the parent brd
device (and all other partitions of that brd device).
This change breaks compatibility - but in this case the compatibility
breaks more than it helps.
Reported-by: Mikulas Patocka <mpatocka@redhat.com>
Suggested-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'drivers/block/brd.c')
| -rw-r--r-- | drivers/block/brd.c | 35 |
1 files changed, 0 insertions, 35 deletions
diff --git a/drivers/block/brd.c b/drivers/block/brd.c index 9d5335857191..ad793f35632c 100644 --- a/drivers/block/brd.c +++ b/drivers/block/brd.c @@ -395,44 +395,9 @@ static long brd_direct_access(struct block_device *bdev, sector_t sector, #define brd_direct_access NULL #endif -static int brd_ioctl(struct block_device *bdev, fmode_t mode, - unsigned int cmd, unsigned long arg) -{ - int error; - struct brd_device *brd = bdev->bd_disk->private_data; - - if (cmd != BLKFLSBUF) - return -ENOTTY; - - /* - * ram device BLKFLSBUF has special semantics, we want to actually - * release and destroy the ramdisk data. - */ - mutex_lock(&brd_mutex); - mutex_lock(&bdev->bd_mutex); - error = -EBUSY; - if (bdev->bd_openers <= 1) { - /* - * Kill the cache first, so it isn't written back to the - * device. - * - * Another thread might instantiate more buffercache here, - * but there is not much we can do to close that race. - */ - kill_bdev(bdev); - brd_free_pages(brd); - error = 0; - } - mutex_unlock(&bdev->bd_mutex); - mutex_unlock(&brd_mutex); - - return error; -} - static const struct block_device_operations brd_fops = { .owner = THIS_MODULE, .rw_page = brd_rw_page, - .ioctl = brd_ioctl, .direct_access = brd_direct_access, }; |