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block: misc updates

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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>
This commit is contained in:
Tejun Heo 2008-08-25 19:47:17 +09:00 committed by Jens Axboe
parent 88e341261c
commit 310a2c1012
5 changed files with 19 additions and 11 deletions
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7
block/blk-core.c
View File

@ -60,7 +60,7 @@ static void drive_stat_acct(struct request *rq, int new_io)
if (!blk_fs_request(rq) || !rq->rq_disk)
return;
part = get_part(rq->rq_disk, rq->sector);
part = disk_map_sector(rq->rq_disk, rq->sector);
if (!new_io)
__all_stat_inc(rq->rq_disk, part, merges[rw], rq->sector);
else {
@ -1557,7 +1557,8 @@ static int __end_that_request_first(struct request *req, int error,
}
if (blk_fs_request(req) && req->rq_disk) {
struct hd_struct *part = get_part(req->rq_disk, req->sector);
struct hd_struct *part =
disk_map_sector(req->rq_disk, req->sector);
const int rw = rq_data_dir(req);
all_stat_add(req->rq_disk, part, sectors[rw],
@ -1745,7 +1746,7 @@ static void end_that_request_last(struct request *req, int error)
if (disk && blk_fs_request(req) && req != &req->q->bar_rq) {
unsigned long duration = jiffies - req->start_time;
const int rw = rq_data_dir(req);
struct hd_struct *part = get_part(disk, req->sector);
struct hd_struct *part = disk_map_sector(disk, req->sector);
__all_stat_inc(disk, part, ios[rw], req->sector);
__all_stat_add(disk, part, ticks[rw], duration, req->sector);

4
block/blk-merge.c
View File

@ -387,8 +387,8 @@ static int attempt_merge(struct request_queue *q, struct request *req,
elv_merge_requests(q, req, next);
if (req->rq_disk) {
struct hd_struct *part
= get_part(req->rq_disk, req->sector);
struct hd_struct *part =
disk_map_sector(req->rq_disk, req->sector);
disk_round_stats(req->rq_disk);
req->rq_disk->in_flight--;
if (part) {

4
block/genhd.c
View File

@ -568,7 +568,7 @@ static int diskstats_show(struct seq_file *s, void *v)
{
struct gendisk *gp = v;
char buf[BDEVNAME_SIZE];
int n = 0;
int n;
/*
if (&gp->dev.kobj.entry == block_class.devices.next)
@ -582,7 +582,7 @@ static int diskstats_show(struct seq_file *s, void *v)
disk_round_stats(gp);
preempt_enable();
seq_printf(s, "%4d %4d %s %lu %lu %llu %u %lu %lu %llu %u %u %u %u\n",
gp->major, n + gp->first_minor, disk_name(gp, n, buf),
gp->major, gp->first_minor, disk_name(gp, 0, buf),
disk_stat_read(gp, ios[0]), disk_stat_read(gp, merges[0]),
(unsigned long long)disk_stat_read(gp, sectors[0]),
jiffies_to_msecs(disk_stat_read(gp, ticks[0])),

2
drivers/block/aoe/aoecmd.c
View File

@ -757,7 +757,7 @@ diskstats(struct gendisk *disk, struct bio *bio, ulong duration, sector_t sector
const int rw = bio_data_dir(bio);
struct hd_struct *part;
part = get_part(disk, sector);
part = disk_map_sector(disk, sector);
all_stat_inc(disk, part, ios[rw], sector);
all_stat_add(disk, part, ticks[rw], duration, sector);
all_stat_add(disk, part, sectors[rw], n_sect, sector);

13
include/linux/genhd.h
View File

@ -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;