diff options
| author | Christoph Hellwig <hch@lst.de> | 2015-10-15 14:10:50 +0200 |
|---|---|---|
| committer | Mike Snitzer <snitzer@redhat.com> | 2015-10-31 19:05:59 -0400 |
| commit | e56f81e0b01ef4e45292d8c1e19edd4d09724e14 (patch) | |
| tree | 68b1faed3589d00b7a473ce856532e321f9e4908 /drivers/md/dm-switch.c | |
| parent | 47796938c46b943d157ac8a6f9ed4e3b98b83cf4 (diff) | |
dm: refactor ioctl handling
This moves the call to blkdev_ioctl and the argument checking to DM core
code, and only leaves a callout to find the block device to operate on
in the targets. This simplifies the code and allows us to pass through
ioctl-like command using other methods in the next patch.
Also split out a helper around calling the prepare_ioctl method that
will be reused for persistent reservation handling.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Diffstat (limited to 'drivers/md/dm-switch.c')
| -rw-r--r-- | drivers/md/dm-switch.c | 21 |
1 files changed, 9 insertions, 12 deletions
diff --git a/drivers/md/dm-switch.c b/drivers/md/dm-switch.c index 50fca469cafd..b1285753a5d4 100644 --- a/drivers/md/dm-switch.c +++ b/drivers/md/dm-switch.c @@ -511,27 +511,24 @@ static void switch_status(struct dm_target *ti, status_type_t type, * * Passthrough all ioctls to the path for sector 0 */ -static int switch_ioctl(struct dm_target *ti, unsigned cmd, - unsigned long arg) +static int switch_prepare_ioctl(struct dm_target *ti, + struct block_device **bdev, fmode_t *mode) { struct switch_ctx *sctx = ti->private; - struct block_device *bdev; - fmode_t mode; unsigned path_nr; - int r = 0; path_nr = switch_get_path_nr(sctx, 0); - bdev = sctx->path_list[path_nr].dmdev->bdev; - mode = sctx->path_list[path_nr].dmdev->mode; + *bdev = sctx->path_list[path_nr].dmdev->bdev; + *mode = sctx->path_list[path_nr].dmdev->mode; /* * Only pass ioctls through if the device sizes match exactly. */ - if (ti->len + sctx->path_list[path_nr].start != i_size_read(bdev->bd_inode) >> SECTOR_SHIFT) - r = scsi_verify_blk_ioctl(NULL, cmd); - - return r ? : __blkdev_driver_ioctl(bdev, mode, cmd, arg); + if (ti->len + sctx->path_list[path_nr].start != + i_size_read((*bdev)->bd_inode) >> SECTOR_SHIFT) + return 1; + return 0; } static int switch_iterate_devices(struct dm_target *ti, @@ -560,7 +557,7 @@ static struct target_type switch_target = { .map = switch_map, .message = switch_message, .status = switch_status, - .ioctl = switch_ioctl, + .prepare_ioctl = switch_prepare_ioctl, .iterate_devices = switch_iterate_devices, }; |