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authorTejun Heo <tj@kernel.org>2008-09-03 03:01:48 -0400
committerJens Axboe <jens.axboe@oracle.com>2008-10-09 02:56:05 -0400
commitf331c0296f2a9fee0d396a70598b954062603015 (patch)
treef74c467d58940131d97d90c4ea549843185e6ef0 /fs
parentcf771cb5a7b716f3f9e532fd42a1e3a0a75adec5 (diff)
block: don't depend on consecutive minor space
* Implement disk_devt() and part_devt() and use them to directly access devt instead of computing it from ->major and ->first_minor. Note that all references to ->major and ->first_minor outside of block layer is used to determine devt of the disk (the part0) and as ->major and ->first_minor will continue to represent devt for the disk, converting these users aren't strictly necessary. However, convert them for consistency. * Implement disk_max_parts() to avoid directly deferencing genhd->minors. * Update bdget_disk() such that it doesn't assume consecutive minor space. * Move devt computation from register_disk() to add_disk() and make it the only one (all other usages use the initially determined value). These changes clean up the code and will help disk->part dereference fix and extended block device numbers. Signed-off-by: Tejun Heo <tj@kernel.org> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/block_dev.c2
-rw-r--r--fs/partitions/check.c19
2 files changed, 12 insertions, 9 deletions
diff --git a/fs/block_dev.c b/fs/block_dev.c
index de0776cd7215..72e0a2887cb7 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -892,7 +892,7 @@ int check_disk_change(struct block_device *bdev)
892 892
893 if (bdops->revalidate_disk) 893 if (bdops->revalidate_disk)
894 bdops->revalidate_disk(bdev->bd_disk); 894 bdops->revalidate_disk(bdev->bd_disk);
895 if (bdev->bd_disk->minors > 1) 895 if (disk_max_parts(bdev->bd_disk))
896 bdev->bd_invalidated = 1; 896 bdev->bd_invalidated = 1;
897 return 1; 897 return 1;
898} 898}
diff --git a/fs/partitions/check.c b/fs/partitions/check.c
index b86aab1b0df6..e77fa144a07d 100644
--- a/fs/partitions/check.c
+++ b/fs/partitions/check.c
@@ -134,7 +134,11 @@ char *disk_name(struct gendisk *hd, int partno, char *buf)
134 134
135const char *bdevname(struct block_device *bdev, char *buf) 135const char *bdevname(struct block_device *bdev, char *buf)
136{ 136{
137 int partno = MINOR(bdev->bd_dev) - bdev->bd_disk->first_minor; 137 int partno = 0;
138
139 if (bdev->bd_part)
140 partno = bdev->bd_part->partno;
141
138 return disk_name(bdev->bd_disk, partno, buf); 142 return disk_name(bdev->bd_disk, partno, buf);
139} 143}
140 144
@@ -169,7 +173,7 @@ check_partition(struct gendisk *hd, struct block_device *bdev)
169 if (isdigit(state->name[strlen(state->name)-1])) 173 if (isdigit(state->name[strlen(state->name)-1]))
170 sprintf(state->name, "p"); 174 sprintf(state->name, "p");
171 175
172 state->limit = hd->minors; 176 state->limit = disk_max_parts(hd) + 1;
173 i = res = err = 0; 177 i = res = err = 0;
174 while (!res && check_part[i]) { 178 while (!res && check_part[i]) {
175 memset(&state->parts, 0, sizeof(state->parts)); 179 memset(&state->parts, 0, sizeof(state->parts));
@@ -416,7 +420,6 @@ void register_disk(struct gendisk *disk)
416 int err; 420 int err;
417 421
418 disk->dev.parent = disk->driverfs_dev; 422 disk->dev.parent = disk->driverfs_dev;
419 disk->dev.devt = MKDEV(disk->major, disk->first_minor);
420 423
421 strlcpy(disk->dev.bus_id, disk->disk_name, BUS_ID_SIZE); 424 strlcpy(disk->dev.bus_id, disk->disk_name, BUS_ID_SIZE);
422 /* ewww... some of these buggers have / in the name... */ 425 /* ewww... some of these buggers have / in the name... */
@@ -440,7 +443,7 @@ void register_disk(struct gendisk *disk)
440 disk_sysfs_add_subdirs(disk); 443 disk_sysfs_add_subdirs(disk);
441 444
442 /* No minors to use for partitions */ 445 /* No minors to use for partitions */
443 if (disk->minors == 1) 446 if (!disk_max_parts(disk))
444 goto exit; 447 goto exit;
445 448
446 /* No such device (e.g., media were just removed) */ 449 /* No such device (e.g., media were just removed) */
@@ -463,8 +466,8 @@ exit:
463 kobject_uevent(&disk->dev.kobj, KOBJ_ADD); 466 kobject_uevent(&disk->dev.kobj, KOBJ_ADD);
464 467
465 /* announce possible partitions */ 468 /* announce possible partitions */
466 for (i = 1; i < disk->minors; i++) { 469 for (i = 0; i < disk_max_parts(disk); i++) {
467 p = disk->part[i-1]; 470 p = disk->part[i];
468 if (!p || !p->nr_sects) 471 if (!p || !p->nr_sects)
469 continue; 472 continue;
470 kobject_uevent(&p->dev.kobj, KOBJ_ADD); 473 kobject_uevent(&p->dev.kobj, KOBJ_ADD);
@@ -482,7 +485,7 @@ int rescan_partitions(struct gendisk *disk, struct block_device *bdev)
482 if (res) 485 if (res)
483 return res; 486 return res;
484 bdev->bd_invalidated = 0; 487 bdev->bd_invalidated = 0;
485 for (p = 1; p < disk->minors; p++) 488 for (p = 1; p <= disk_max_parts(disk); p++)
486 delete_partition(disk, p); 489 delete_partition(disk, p);
487 if (disk->fops->revalidate_disk) 490 if (disk->fops->revalidate_disk)
488 disk->fops->revalidate_disk(disk); 491 disk->fops->revalidate_disk(disk);
@@ -545,7 +548,7 @@ void del_gendisk(struct gendisk *disk)
545 int p; 548 int p;
546 549
547 /* invalidate stuff */ 550 /* invalidate stuff */
548 for (p = disk->minors - 1; p > 0; p--) { 551 for (p = disk_max_parts(disk); p > 0; p--) {
549 invalidate_partition(disk, p); 552 invalidate_partition(disk, p);
550 delete_partition(disk, p); 553 delete_partition(disk, p);
551 } 554 }