md: fix 'degraded' calculation when starting a reshape.

[safe/jmp/linux-2.6] / drivers / md / dm-linear.c

diff --git a/drivers/md/dm-linear.c b/drivers/md/dm-linear.c
index 6a2cd5d..82f7d6e 100644 (file)
--- a/drivers/md/dm-linear.c
+++ b/drivers/md/dm-linear.c
@@ -5,12 +5,14 @@
  */
 
 #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"
 
 /*
  * Linear: maps a linear range of a device.
@@ -26,9 +28,10 @@ struct linear_c {
 static int linear_ctr(struct dm_target *ti, unsigned int argc, char **argv)
 {
        struct linear_c *lc;
+       unsigned long long tmp;
 
        if (argc != 2) {
-               ti->error = "dm-linear: Invalid argument count";
+               ti->error = "Invalid argument count";
                return -EINVAL;
        }
 
@@ -38,10 +41,11 @@ static int linear_ctr(struct dm_target *ti, unsigned int argc, char **argv)
                return -ENOMEM;
        }
 
-       if (sscanf(argv[1], SECTOR_FORMAT, &lc->start) != 1) {
+       if (sscanf(argv[1], "%llu", &tmp) != 1) {
                ti->error = "dm-linear: Invalid device sector";
                goto bad;
        }
+       lc->start = tmp;
 
        if (dm_get_device(ti, argv[0], lc->start, ti->len,
                          dm_table_get_mode(ti->table), &lc->dev)) {
@@ -49,6 +53,7 @@ static int linear_ctr(struct dm_target *ti, unsigned int argc, char **argv)
                goto bad;
        }
 
+       ti->num_flush_requests = 1;
        ti->private = lc;
        return 0;
 
@@ -65,15 +70,28 @@ 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);
+       if (bio_sectors(bio))
+               bio->bi_sector = linear_map_sector(ti, bio->bi_sector);
+}
 
-       return 1;
+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;
 }
 
 static int linear_status(struct dm_target *ti, status_type_t type,
@@ -87,21 +105,54 @@ static int linear_status(struct dm_target *ti, status_type_t type,
                break;
 
        case STATUSTYPE_TABLE:
-               snprintf(result, maxlen, "%s " SECTOR_FORMAT, lc->dev->name,
-                        lc->start);
+               snprintf(result, maxlen, "%s %llu", lc->dev->name,
+                               (unsigned long long)lc->start);
                break;
        }
        return 0;
 }
 
+static int linear_ioctl(struct dm_target *ti, unsigned int cmd,
+                       unsigned long arg)
+{
+       struct linear_c *lc = (struct linear_c *) ti->private;
+       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;
+
+       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 int linear_iterate_devices(struct dm_target *ti,
+                                 iterate_devices_callout_fn fn, void *data)
+{
+       struct linear_c *lc = ti->private;
+
+       return fn(ti, lc->dev, lc->start, ti->len, data);
+}
+
 static struct target_type linear_target = {
        .name   = "linear",
-       .version= {1, 0, 1},
+       .version = {1, 1, 0},
        .module = THIS_MODULE,
        .ctr    = linear_ctr,
        .dtr    = linear_dtr,
        .map    = linear_map,
        .status = linear_status,
+       .ioctl  = linear_ioctl,
+       .merge  = linear_merge,
+       .iterate_devices = linear_iterate_devices,
 };
 
 int __init dm_linear_init(void)
@@ -109,15 +160,12 @@ 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;
 }
 
 void dm_linear_exit(void)
 {
-       int r = dm_unregister_target(&linear_target);
-
-       if (r < 0)
-               DMERR("linear: unregister failed %d", r);
+       dm_unregister_target(&linear_target);
 }