#include <linux/bio.h>
#include <linux/slab.h>
+#define DM_MSG_PREFIX "linear"
+
/*
* Linear: maps a linear range of a device.
*/
unsigned long long tmp;
if (argc != 2) {
- ti->error = "dm-linear: Invalid argument count";
+ ti->error = "Invalid argument count";
return -EINVAL;
}
kfree(lc);
}
-static int linear_map(struct dm_target *ti, struct bio *bio,
- union map_info *map_context)
+static sector_t linear_map_sector(struct dm_target *ti, sector_t bi_sector)
{
- struct linear_c *lc = (struct linear_c *) ti->private;
+ struct linear_c *lc = ti->private;
+
+ return lc->start + (bi_sector - ti->begin);
+}
+
+static void linear_map_bio(struct dm_target *ti, struct bio *bio)
+{
+ struct linear_c *lc = ti->private;
bio->bi_bdev = lc->dev->bdev;
- bio->bi_sector = lc->start + (bio->bi_sector - ti->begin);
+ bio->bi_sector = linear_map_sector(ti, bio->bi_sector);
+}
+
+static int linear_map(struct dm_target *ti, struct bio *bio,
+ union map_info *map_context)
+{
+ linear_map_bio(ti, bio);
- return 1;
+ return DM_MAPIO_REMAPPED;
}
static int linear_status(struct dm_target *ti, status_type_t type,
return 0;
}
+static int linear_ioctl(struct dm_target *ti, struct inode *inode,
+ struct file *filp, unsigned int cmd,
+ unsigned long arg)
+{
+ struct linear_c *lc = (struct linear_c *) ti->private;
+ struct block_device *bdev = lc->dev->bdev;
+ struct file fake_file = {};
+ struct dentry fake_dentry = {};
+
+ fake_file.f_mode = lc->dev->mode;
+ fake_file.f_path.dentry = &fake_dentry;
+ fake_dentry.d_inode = bdev->bd_inode;
+
+ return blkdev_driver_ioctl(bdev->bd_inode, &fake_file, bdev->bd_disk, cmd, arg);
+}
+
+static int linear_merge(struct dm_target *ti, struct bvec_merge_data *bvm,
+ struct bio_vec *biovec, int max_size)
+{
+ struct linear_c *lc = ti->private;
+ struct request_queue *q = bdev_get_queue(lc->dev->bdev);
+
+ if (!q->merge_bvec_fn)
+ return max_size;
+
+ bvm->bi_bdev = lc->dev->bdev;
+ bvm->bi_sector = linear_map_sector(ti, bvm->bi_sector);
+
+ return min(max_size, q->merge_bvec_fn(q, bvm, biovec));
+}
+
static struct target_type linear_target = {
.name = "linear",
- .version= {1, 0, 1},
+ .version= {1, 0, 3},
.module = THIS_MODULE,
.ctr = linear_ctr,
.dtr = linear_dtr,
.map = linear_map,
.status = linear_status,
+ .ioctl = linear_ioctl,
+ .merge = linear_merge,
};
int __init dm_linear_init(void)
int r = dm_register_target(&linear_target);
if (r < 0)
- DMERR("linear: register failed %d", r);
+ DMERR("register failed %d", r);
return r;
}
int r = dm_unregister_target(&linear_target);
if (r < 0)
- DMERR("linear: unregister failed %d", r);
+ DMERR("unregister failed %d", r);
}