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authorChristoph Hellwig <hch@lst.de>2015-10-15 15:10:50 +0300
committerMike Snitzer <snitzer@redhat.com>2015-11-01 02:05:59 +0300
commite56f81e0b01ef4e45292d8c1e19edd4d09724e14 (patch)
tree68b1faed3589d00b7a473ce856532e321f9e4908 /drivers/md/dm-log-writes.c
parent47796938c46b943d157ac8a6f9ed4e3b98b83cf4 (diff)
downloadlinux-e56f81e0b01ef4e45292d8c1e19edd4d09724e14.tar.xz
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-log-writes.c')
-rw-r--r--drivers/md/dm-log-writes.c13
1 files changed, 6 insertions, 7 deletions
diff --git a/drivers/md/dm-log-writes.c b/drivers/md/dm-log-writes.c
index b2912dbac8bc..624589d51c2c 100644
--- a/drivers/md/dm-log-writes.c
+++ b/drivers/md/dm-log-writes.c
@@ -714,20 +714,19 @@ static void log_writes_status(struct dm_target *ti, status_type_t type,
}
}
-static int log_writes_ioctl(struct dm_target *ti, unsigned int cmd,
- unsigned long arg)
+static int log_writes_prepare_ioctl(struct dm_target *ti,
+ struct block_device **bdev, fmode_t *mode)
{
struct log_writes_c *lc = ti->private;
struct dm_dev *dev = lc->dev;
- int r = 0;
+ *bdev = dev->bdev;
/*
* Only pass ioctls through if the device sizes match exactly.
*/
if (ti->len != i_size_read(dev->bdev->bd_inode) >> SECTOR_SHIFT)
- r = scsi_verify_blk_ioctl(NULL, cmd);
-
- return r ? : __blkdev_driver_ioctl(dev->bdev, dev->mode, cmd, arg);
+ return 1;
+ return 0;
}
static int log_writes_iterate_devices(struct dm_target *ti,
@@ -782,7 +781,7 @@ static struct target_type log_writes_target = {
.map = log_writes_map,
.end_io = normal_end_io,
.status = log_writes_status,
- .ioctl = log_writes_ioctl,
+ .prepare_ioctl = log_writes_prepare_ioctl,
.message = log_writes_message,
.iterate_devices = log_writes_iterate_devices,
.io_hints = log_writes_io_hints,