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| author |   Tejun Heo <tj@kernel.org> | 2008-08-25 19:47:17 +0900 |
|---|---|---|
| committer |   Jens Axboe <jens.axboe@oracle.com> | 2008-10-09 08:56:04 +0200 |
| commit | 310a2c1012934f590192377f65940cad4aa72b15 (patch) | |
| tree | ed30346abf07c5a7e94719f567368d5642af1f95 /include/linux/genhd.h | |
| parent | block: update add_partition() error handling (diff) | |
| download | linux-dev-310a2c1012934f590192377f65940cad4aa72b15.tar.xz linux-dev-310a2c1012934f590192377f65940cad4aa72b15.zip | |
block: misc updates
This patch makes the following misc updates in preparation for
disk->part dereference fix and extended block devt support.
* implment part_to_disk()
* fix comment about gendisk->part indexing
* rename get_part() to disk_map_sector()
* don't use n which is always zero while printing disk information in
diskstats_show()
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'include/linux/genhd.h')
| -rw-r--r-- | include/linux/genhd.h | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/include/linux/genhd.h b/include/linux/genhd.h index be4f5e5bfe06..c64e659c9843 100644 --- a/include/linux/genhd.h +++ b/include/linux/genhd.h @@ -116,7 +116,7 @@ struct gendisk { int minors; /* maximum number of minors, =1 for * disks that can't be partitioned. */ char disk_name[32]; /* name of major driver */ - struct hd_struct **part; /* [indexed by minor] */ + struct hd_struct **part; /* [indexed by minor - 1] */ struct block_device_operations *fops; struct request_queue *queue; void *private_data; @@ -145,14 +145,21 @@ struct gendisk { #endif }; +static inline struct gendisk *part_to_disk(struct hd_struct *part) +{ + if (likely(part)) + return dev_to_disk((part)->dev.parent); + return NULL; +} + /* * Macros to operate on percpu disk statistics: * * The __ variants should only be called in critical sections. The full * variants disable/enable preemption. */ -static inline struct hd_struct *get_part(struct gendisk *gendiskp, - sector_t sector) +static inline struct hd_struct *disk_map_sector(struct gendisk *gendiskp, + sector_t sector) { struct hd_struct *part; int i; |