[PATCH 4/6] dm: refactor ioctl handling
Christoph Hellwig
hch at lst.de
Tue Aug 4 00:11:09 PDT 2015
This moves the call to blkdev_ioctl and the argument checking to core code,
and only leaves a callout to find the block device to operate on it the
targets. This will simplifies the code and will allow us to pass through
ioctl-like command using other methods in the next patch.
Signed-off-by: Christoph Hellwig <hch at lst.de>
---
drivers/md/dm-flakey.c | 14 +++++++-------
drivers/md/dm-linear.c | 12 ++++++------
drivers/md/dm-log-writes.c | 11 +++++------
drivers/md/dm-mpath.c | 30 +++++++++++-------------------
drivers/md/dm-switch.c | 19 ++++++++-----------
drivers/md/dm-verity.c | 13 ++++++-------
drivers/md/dm.c | 12 +++++++++++-
include/linux/device-mapper.h | 4 ++--
8 files changed, 56 insertions(+), 59 deletions(-)
diff --git a/drivers/md/dm-flakey.c b/drivers/md/dm-flakey.c
index b257e46..ec4ebc8 100644
--- a/drivers/md/dm-flakey.c
+++ b/drivers/md/dm-flakey.c
@@ -371,20 +371,20 @@ static void flakey_status(struct dm_target *ti, status_type_t type,
}
}
-static int flakey_ioctl(struct dm_target *ti, unsigned int cmd, unsigned long arg)
+static int flakey_ioctl(struct dm_target *ti, struct block_device **bdev,
+ fmode_t *mode)
{
struct flakey_c *fc = ti->private;
- struct dm_dev *dev = fc->dev;
- int r = 0;
+
+ *bdev = fc->dev->bdev;
/*
* Only pass ioctls through if the device sizes match exactly.
*/
if (fc->start ||
- 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);
+ ti->len != i_size_read((*bdev)->bd_inode) >> SECTOR_SHIFT)
+ return 1;
+ return 0;
}
static int flakey_merge(struct dm_target *ti, struct bvec_merge_data *bvm,
diff --git a/drivers/md/dm-linear.c b/drivers/md/dm-linear.c
index 53e848c..d897707 100644
--- a/drivers/md/dm-linear.c
+++ b/drivers/md/dm-linear.c
@@ -113,21 +113,21 @@ static void linear_status(struct dm_target *ti, status_type_t type,
}
}
-static int linear_ioctl(struct dm_target *ti, unsigned int cmd,
- unsigned long arg)
+static int linear_ioctl(struct dm_target *ti, struct block_device **bdev,
+ fmode_t *mode)
{
struct linear_c *lc = (struct linear_c *) 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 (lc->start ||
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 linear_merge(struct dm_target *ti, struct bvec_merge_data *bvm,
diff --git a/drivers/md/dm-log-writes.c b/drivers/md/dm-log-writes.c
index ad1b049..811fc42 100644
--- a/drivers/md/dm-log-writes.c
+++ b/drivers/md/dm-log-writes.c
@@ -712,20 +712,19 @@ 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_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_merge(struct dm_target *ti, struct bvec_merge_data *bvm,
diff --git a/drivers/md/dm-mpath.c b/drivers/md/dm-mpath.c
index eff7bdd..8670597 100644
--- a/drivers/md/dm-mpath.c
+++ b/drivers/md/dm-mpath.c
@@ -1548,18 +1548,14 @@ out:
return r;
}
-static int multipath_ioctl(struct dm_target *ti, unsigned int cmd,
- unsigned long arg)
+static int multipath_ioctl(struct dm_target *ti,
+ struct block_device **bdev, fmode_t *mode)
{
struct multipath *m = ti->private;
struct pgpath *pgpath;
- struct block_device *bdev;
- fmode_t mode;
unsigned long flags;
int r;
- bdev = NULL;
- mode = 0;
r = 0;
spin_lock_irqsave(&m->lock, flags);
@@ -1570,26 +1566,17 @@ static int multipath_ioctl(struct dm_target *ti, unsigned int cmd,
pgpath = m->current_pgpath;
if (pgpath) {
- bdev = pgpath->path.dev->bdev;
- mode = pgpath->path.dev->mode;
+ *bdev = pgpath->path.dev->bdev;
+ *mode = pgpath->path.dev->mode;
}
if ((pgpath && m->queue_io) || (!pgpath && m->queue_if_no_path))
r = -ENOTCONN;
- else if (!bdev)
+ else if (!*bdev)
r = -EIO;
spin_unlock_irqrestore(&m->lock, flags);
- /*
- * Only pass ioctls through if the device sizes match exactly.
- */
- if (!bdev || ti->len != i_size_read(bdev->bd_inode) >> SECTOR_SHIFT) {
- int err = scsi_verify_blk_ioctl(NULL, cmd);
- if (err)
- r = err;
- }
-
if (r == -ENOTCONN && !fatal_signal_pending(current)) {
spin_lock_irqsave(&m->lock, flags);
if (!m->current_pg) {
@@ -1602,7 +1589,12 @@ static int multipath_ioctl(struct dm_target *ti, unsigned int cmd,
dm_table_run_md_queue_async(m->ti->table);
}
- return r ? : __blkdev_driver_ioctl(bdev, mode, cmd, arg);
+ /*
+ * Only pass ioctls through if the device sizes match exactly.
+ */
+ if (!r && ti->len != i_size_read((*bdev)->bd_inode) >> SECTOR_SHIFT)
+ return 1;
+ return r;
}
static int multipath_iterate_devices(struct dm_target *ti,
diff --git a/drivers/md/dm-switch.c b/drivers/md/dm-switch.c
index 50fca46..37d27e9 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_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,
diff --git a/drivers/md/dm-verity.c b/drivers/md/dm-verity.c
index bb9c6a0..bd20c41 100644
--- a/drivers/md/dm-verity.c
+++ b/drivers/md/dm-verity.c
@@ -634,18 +634,17 @@ static void verity_status(struct dm_target *ti, status_type_t type,
}
}
-static int verity_ioctl(struct dm_target *ti, unsigned cmd,
- unsigned long arg)
+static int verity_ioctl(struct dm_target *ti, struct block_device **bdev,
+ fmode_t *mode)
{
struct dm_verity *v = ti->private;
- int r = 0;
+
+ *bdev = v->data_dev->bdev;
if (v->data_start ||
ti->len != i_size_read(v->data_dev->bdev->bd_inode) >> SECTOR_SHIFT)
- r = scsi_verify_blk_ioctl(NULL, cmd);
-
- return r ? : __blkdev_driver_ioctl(v->data_dev->bdev, v->data_dev->mode,
- cmd, arg);
+ return 1;
+ return 0;
}
static int verity_merge(struct dm_target *ti, struct bvec_merge_data *bvm,
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index f331d88..c68eb91 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -584,7 +584,17 @@ retry:
goto out;
}
- r = tgt->type->ioctl(tgt, cmd, arg);
+ r = tgt->type->ioctl(tgt, &bdev, &mode);
+ if (r < 0)
+ goto out;
+
+ if (r > 0) {
+ r = scsi_verify_blk_ioctl(NULL, cmd);
+ if (r)
+ goto out;
+ }
+
+ r = __blkdev_driver_ioctl(bdev, mode, cmd, arg);
out:
dm_put_live_table(md, srcu_idx);
diff --git a/include/linux/device-mapper.h b/include/linux/device-mapper.h
index 51cc1de..9b73138 100644
--- a/include/linux/device-mapper.h
+++ b/include/linux/device-mapper.h
@@ -79,8 +79,8 @@ typedef void (*dm_status_fn) (struct dm_target *ti, status_type_t status_type,
typedef int (*dm_message_fn) (struct dm_target *ti, unsigned argc, char **argv);
-typedef int (*dm_ioctl_fn) (struct dm_target *ti, unsigned int cmd,
- unsigned long arg);
+typedef int (*dm_ioctl_fn) (struct dm_target *ti,
+ struct block_device **bdev, fmode_t *mode);
typedef int (*dm_merge_fn) (struct dm_target *ti, struct bvec_merge_data *bvm,
struct bio_vec *biovec, int max_size);
--
1.9.1
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