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authorMartin K. Petersen <martin.petersen@oracle.com>2015-10-21 20:19:49 +0300
committerJens Axboe <axboe@fb.com>2015-10-21 23:42:42 +0300
commit25520d55cdb6ee289abc68f553d364d22478ff54 (patch)
tree84e447f762e7f60095d0c4d24fdf2d9440f4b06d /include/linux/genhd.h
parent4c241d08dbfcbdc7a949b91d72707a289d464954 (diff)
downloadlinux-25520d55cdb6ee289abc68f553d364d22478ff54.tar.xz
block: Inline blk_integrity in struct gendisk
Up until now the_integrity profile has been dynamically allocated and attached to struct gendisk after the disk has been made active. This causes problems because NVMe devices need to register the profile prior to the partition table being read due to a mandatory metadata buffer requirement. In addition, DM goes through hoops to deal with preallocating, but not initializing integrity profiles. Since the integrity profile is small (4 bytes + a pointer), Christoph suggested moving it to struct gendisk proper. This requires several changes: - Moving the blk_integrity definition to genhd.h. - Inlining blk_integrity in struct gendisk. - Removing the dynamic allocation code. - Adding helper functions which allow gendisk to set up and tear down the integrity sysfs dir when a disk is added/deleted. - Adding a blk_integrity_revalidate() callback for updating the stable pages bdi setting. - The calls that depend on whether a device has an integrity profile or not now key off of the bi->profile pointer. - Simplifying the integrity support routines in DM (Mike Snitzer). Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com> Reported-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Sagi Grimberg <sagig@mellanox.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com> Cc: Dan Williams <dan.j.williams@intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com> Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'include/linux/genhd.h')
-rw-r--r--include/linux/genhd.h26
1 files changed, 24 insertions, 2 deletions
diff --git a/include/linux/genhd.h b/include/linux/genhd.h
index 9e6e0dfa97ad..82f4911e0ad8 100644
--- a/include/linux/genhd.h
+++ b/include/linux/genhd.h
@@ -163,6 +163,18 @@ struct disk_part_tbl {
struct disk_events;
+#if defined(CONFIG_BLK_DEV_INTEGRITY)
+
+struct blk_integrity {
+ struct blk_integrity_profile *profile;
+ unsigned char flags;
+ unsigned char tuple_size;
+ unsigned char interval_exp;
+ unsigned char tag_size;
+};
+
+#endif /* CONFIG_BLK_DEV_INTEGRITY */
+
struct gendisk {
/* major, first_minor and minors are input parameters only,
* don't use directly. Use disk_devt() and disk_max_parts().
@@ -198,9 +210,9 @@ struct gendisk {
atomic_t sync_io; /* RAID */
struct disk_events *ev;
#ifdef CONFIG_BLK_DEV_INTEGRITY
- struct blk_integrity *integrity;
+ struct blk_integrity integrity;
struct kobject integrity_kobj;
-#endif
+#endif /* CONFIG_BLK_DEV_INTEGRITY */
int node_id;
};
@@ -728,6 +740,16 @@ static inline void part_nr_sects_write(struct hd_struct *part, sector_t size)
#endif
}
+#if defined(CONFIG_BLK_DEV_INTEGRITY)
+extern void blk_integrity_add(struct gendisk *);
+extern void blk_integrity_del(struct gendisk *);
+extern void blk_integrity_revalidate(struct gendisk *);
+#else /* CONFIG_BLK_DEV_INTEGRITY */
+static inline void blk_integrity_add(struct gendisk *disk) { }
+static inline void blk_integrity_del(struct gendisk *disk) { }
+static inline void blk_integrity_revalidate(struct gendisk *disk) { }
+#endif /* CONFIG_BLK_DEV_INTEGRITY */
+
#else /* CONFIG_BLOCK */
static inline void printk_all_partitions(void) { }