block: move policy from disk to part0

Move disk->policy to part0->policy.  Implement and use get_disk_ro().

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

diff --git a/block/genhd.c b/block/genhd.c
index c70db35..70358f3 100644 (file)
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -757,7 +757,7 @@ static ssize_t disk_ro_show(struct device *dev,
 {
        struct gendisk *disk = dev_to_disk(dev);
 
-       return sprintf(buf, "%d\n", disk->policy ? 1 : 0);
+       return sprintf(buf, "%d\n", get_disk_ro(disk) ? 1 : 0);
 }
 
 static ssize_t disk_capability_show(struct device *dev,
@@ -1090,10 +1090,7 @@ EXPORT_SYMBOL(put_disk);
 
 void set_device_ro(struct block_device *bdev, int flag)
 {
-       if (bdev->bd_contains != bdev)
-               bdev->bd_part->policy = flag;
-       else
-               bdev->bd_disk->policy = flag;
+       bdev->bd_part->policy = flag;
 }
 
 EXPORT_SYMBOL(set_device_ro);
@@ -1103,8 +1100,8 @@ void set_disk_ro(struct gendisk *disk, int flag)
        struct disk_part_iter piter;
        struct hd_struct *part;
 
-       disk->policy = flag;
-       disk_part_iter_init(&piter, disk, DISK_PITER_INCL_EMPTY);
+       disk_part_iter_init(&piter, disk,
+                           DISK_PITER_INCL_EMPTY | DISK_PITER_INCL_PART0);
        while ((part = disk_part_iter_next(&piter)))
                part->policy = flag;
        disk_part_iter_exit(&piter);
@@ -1116,10 +1113,7 @@ int bdev_read_only(struct block_device *bdev)
 {
        if (!bdev)
                return 0;
-       else if (bdev->bd_contains != bdev)
-               return bdev->bd_part->policy;
-       else
-               return bdev->bd_disk->policy;
+       return bdev->bd_part->policy;
 }
 
 EXPORT_SYMBOL(bdev_read_only);

diff --git a/drivers/ide/ide-cd.c b/drivers/ide/ide-cd.c
index f16bb46..03c2cb6 100644 (file)
--- a/drivers/ide/ide-cd.c
+++ b/drivers/ide/ide-cd.c
@@ -1113,7 +1113,7 @@ static ide_startstop_t cdrom_start_rw(ide_drive_t *drive, struct request *rq)
 
        if (write) {
                /* disk has become write protected */
-               if (cd->disk->policy) {
+               if (get_disk_ro(cd->disk)) {
                        cdrom_end_request(drive, 0);
                        return ide_stopped;
                }

diff --git a/drivers/md/dm-ioctl.c b/drivers/md/dm-ioctl.c
index c3de311..5b91915 100644 (file)
--- a/drivers/md/dm-ioctl.c
+++ b/drivers/md/dm-ioctl.c
@@ -548,7 +548,7 @@ static int __dev_status(struct mapped_device *md, struct dm_ioctl *param)
         */
        param->open_count = dm_open_count(md);
 
-       if (disk->policy)
+       if (get_disk_ro(disk))
                param->flags |= DM_READONLY_FLAG;
 
        param->event_nr = dm_get_event_nr(md);

diff --git a/fs/partitions/check.c b/fs/partitions/check.c
index 24d2c56..ace6d03 100644 (file)
--- a/fs/partitions/check.c
+++ b/fs/partitions/check.c
@@ -375,7 +375,7 @@ int add_partition(struct gendisk *disk, int partno,
        p->start_sect = start;
        p->nr_sects = len;
        p->partno = partno;
-       p->policy = disk->policy;
+       p->policy = get_disk_ro(disk);
 
        dname = dev_name(ddev);
        if (isdigit(dname[strlen(dname) - 1]))

diff --git a/include/linux/genhd.h b/include/linux/genhd.h
index 9cb8380..4411bdd 100644 (file)
--- a/include/linux/genhd.h
+++ b/include/linux/genhd.h
@@ -145,7 +145,6 @@ struct gendisk {
        struct kobject *slave_dir;
 
        struct timer_rand_state *random;
-       int policy;
 
        atomic_t sync_io;               /* RAID */
        unsigned long stamp;
@@ -403,6 +402,11 @@ extern struct block_device *bdget_disk(struct gendisk *disk, int partno);
 extern void set_device_ro(struct block_device *bdev, int flag);
 extern void set_disk_ro(struct gendisk *disk, int flag);
 
+static inline int get_disk_ro(struct gendisk *disk)
+{
+       return disk->part0.policy;
+}
+
 /* drivers/char/random.c */
 extern void add_disk_randomness(struct gendisk *disk);
 extern void rand_initialize_disk(struct gendisk *disk);