Merge git://git.kernel.org/pub/scm/linux/kernel/git/viro/bdev

[linux-2.6-omap-h63xx.git] / drivers / md / dm-linear.c

diff --git a/drivers/md/dm-linear.c b/drivers/md/dm-linear.c
index 17753d80ad228022b2575e46ee28f867cfd93d6f..44042becad8adea2e53af2af8bdf2589f070d91e 100644 (file)
--- a/drivers/md/dm-linear.c
+++ b/drivers/md/dm-linear.c
@@ -5,12 +5,12 @@
  */
 
 #include "dm.h"
-
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/blkdev.h>
 #include <linux/bio.h>
 #include <linux/slab.h>
+#include <linux/device-mapper.h>
 
 #define DM_MSG_PREFIX "linear"
 
@@ -69,13 +69,25 @@ static void linear_dtr(struct dm_target *ti)
        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 DM_MAPIO_REMAPPED;
 }
@@ -98,31 +110,38 @@ 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,
+static int linear_ioctl(struct dm_target *ti, 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 = {};
+       return __blkdev_driver_ioctl(lc->dev->bdev, lc->dev->mode, 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;
 
-       fake_file.f_mode = lc->dev->mode;
-       fake_file.f_path.dentry = &fake_dentry;
-       fake_dentry.d_inode = bdev->bd_inode;
+       bvm->bi_bdev = lc->dev->bdev;
+       bvm->bi_sector = linear_map_sector(ti, bvm->bi_sector);
 
-       return blkdev_driver_ioctl(bdev->bd_inode, &fake_file, bdev->bd_disk, cmd, arg);
+       return min(max_size, q->merge_bvec_fn(q, bvm, biovec));
 }
 
 static struct target_type linear_target = {
        .name   = "linear",
-       .version= {1, 0, 2},
+       .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)