[PATCH 36/45] block: move the policy field to struct block_device

[Christoph Hellwig <hch@xxxxxx>]

Move the policy field to struct block_device and rename it to the
more descriptive bd_read_only.  Also turn the field into a bool as it
is used as such.

Signed-off-by: Christoph Hellwig <hch@xxxxxx>
---
 block/blk-core.c          | 2 +-
 block/genhd.c             | 8 ++++----
 block/ioctl.c             | 2 +-
 block/partitions/core.c   | 4 ++--
 include/linux/blk_types.h | 1 +
 include/linux/genhd.h     | 4 ++--
 6 files changed, 11 insertions(+), 10 deletions(-)

diff --git a/block/blk-core.c b/block/blk-core.c
index 9121390be97a76..d64ffcb6f9ae5d 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -696,7 +696,7 @@ static inline bool bio_check_ro(struct bio *bio, struct 
hd_struct *part)
 {
        const int op = bio_op(bio);
 
-       if (part->policy && op_is_write(op)) {
+       if (part->bdev->bd_read_only && op_is_write(op)) {
                char b[BDEVNAME_SIZE];
 
                if (op_is_flush(bio->bi_opf) && !bio_sectors(bio))
diff --git a/block/genhd.c b/block/genhd.c
index 8c734a4e8ff31c..8aed77cc8ad169 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -1671,14 +1671,14 @@ void set_disk_ro(struct gendisk *disk, int flag)
        struct disk_part_iter piter;
        struct hd_struct *part;
 
-       if (disk->part0.policy != flag) {
+       if (disk->part0.bdev->bd_read_only != flag) {
                set_disk_ro_uevent(disk, flag);
-               disk->part0.policy = flag;
+               disk->part0.bdev->bd_read_only = flag;
        }
 
        disk_part_iter_init(&piter, disk, DISK_PITER_INCL_EMPTY);
        while ((part = disk_part_iter_next(&piter)))
-               part->policy = flag;
+               part->bdev->bd_read_only = flag;
        disk_part_iter_exit(&piter);
 }
 
@@ -1688,7 +1688,7 @@ int bdev_read_only(struct block_device *bdev)
 {
        if (!bdev)
                return 0;
-       return bdev->bd_part->policy;
+       return bdev->bd_read_only;
 }
 
 EXPORT_SYMBOL(bdev_read_only);
diff --git a/block/ioctl.c b/block/ioctl.c
index a6d8171221c7dc..d61d652078f41c 100644
--- a/block/ioctl.c
+++ b/block/ioctl.c
@@ -345,7 +345,7 @@ static int blkdev_roset(struct block_device *bdev, fmode_t 
mode,
                if (ret)
                        return ret;
        }
-       bdev->bd_part->policy = n;
+       bdev->bd_read_only = n;
        return 0;
 }
 
diff --git a/block/partitions/core.c b/block/partitions/core.c
index ff60a14ed4dcdd..fd00428e437a63 100644
--- a/block/partitions/core.c
+++ b/block/partitions/core.c
@@ -199,7 +199,7 @@ static ssize_t part_ro_show(struct device *dev,
                            struct device_attribute *attr, char *buf)
 {
        struct hd_struct *p = dev_to_part(dev);
-       return sprintf(buf, "%d\n", p->policy ? 1 : 0);
+       return sprintf(buf, "%d\n", p->bdev->bd_read_only);
 }
 
 static ssize_t part_alignment_offset_show(struct device *dev,
@@ -420,7 +420,7 @@ static struct hd_struct *add_partition(struct gendisk 
*disk, int partno,
        bdev->bd_start_sect = start;
        bdev_set_nr_sectors(bdev, len);
        p->partno = partno;
-       p->policy = get_disk_ro(disk);
+       bdev->bd_read_only = get_disk_ro(disk);
 
        if (info) {
                err = -ENOMEM;
diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h
index b237f1e4081405..758cf71c9aa2a6 100644
--- a/include/linux/blk_types.h
+++ b/include/linux/blk_types.h
@@ -23,6 +23,7 @@ struct block_device {
        sector_t                bd_start_sect;
        struct disk_stats __percpu *bd_stats;
        unsigned long           bd_stamp;
+       bool                    bd_read_only;   /* read-only policy */
        dev_t                   bd_dev;
        int                     bd_openers;
        struct inode *          bd_inode;       /* will die */
diff --git a/include/linux/genhd.h b/include/linux/genhd.h
index 5d46ea7be7e4f0..08d00b526b0a3b 100644
--- a/include/linux/genhd.h
+++ b/include/linux/genhd.h
@@ -55,7 +55,7 @@ struct hd_struct {
 
        struct block_device *bdev;
        struct device __dev;
-       int policy, partno;
+       int partno;
        struct rcu_work rcu_work;
 };
 
@@ -279,7 +279,7 @@ extern void set_disk_ro(struct gendisk *disk, int flag);
 
 static inline int get_disk_ro(struct gendisk *disk)
 {
-       return disk->part0.policy;
+       return disk->part0.bdev->bd_read_only;
 }
 
 extern void disk_block_events(struct gendisk *disk);
-- 
2.29.2