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authorMike Snitzer <snitzer@redhat.com>2016-10-25 08:46:23 -0600
committerJens Axboe <axboe@fb.com>2016-10-25 11:55:25 -0600
commitff26956875c2f05e12ecec9938411a2c7dfc767d (patch)
treea2c977c066b96b721399b917d5ce5b1974d9a65a /drivers/block/brd.c
parent366f4aea649a65c3735d91b4409d84c771811290 (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.c35
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,
};