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-rw-r--r--fs/block_dev.c15
-rw-r--r--fs/partitions/check.c70
2 files changed, 53 insertions, 32 deletions
diff --git a/fs/block_dev.c b/fs/block_dev.c
index 72e0a2887cb7..2f2873b9a041 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -929,6 +929,7 @@ static int do_open(struct block_device *bdev, struct file *file, int for_part)
{
struct module *owner = NULL;
struct gendisk *disk;
+ struct hd_struct *part = NULL;
int ret;
int partno;
int perm = 0;
@@ -978,7 +979,6 @@ static int do_open(struct block_device *bdev, struct file *file, int for_part)
if (bdev->bd_invalidated)
rescan_partitions(disk, bdev);
} else {
- struct hd_struct *p;
struct block_device *whole;
whole = bdget_disk(disk, 0);
ret = -ENOMEM;
@@ -989,16 +989,16 @@ static int do_open(struct block_device *bdev, struct file *file, int for_part)
if (ret)
goto out_first;
bdev->bd_contains = whole;
- p = disk->part[partno - 1];
+ part = disk_get_part(disk, partno);
bdev->bd_inode->i_data.backing_dev_info =
whole->bd_inode->i_data.backing_dev_info;
- if (!(disk->flags & GENHD_FL_UP) || !p || !p->nr_sects) {
+ if (!(disk->flags & GENHD_FL_UP) ||
+ !part || !part->nr_sects) {
ret = -ENXIO;
goto out_first;
}
- kobject_get(&p->dev.kobj);
- bdev->bd_part = p;
- bd_set_size(bdev, (loff_t) p->nr_sects << 9);
+ bdev->bd_part = part;
+ bd_set_size(bdev, (loff_t)part->nr_sects << 9);
}
} else {
put_disk(disk);
@@ -1027,6 +1027,7 @@ out_first:
__blkdev_put(bdev->bd_contains, 1);
bdev->bd_contains = NULL;
put_disk(disk);
+ disk_put_part(part);
module_put(owner);
out:
mutex_unlock(&bdev->bd_mutex);
@@ -1119,7 +1120,7 @@ static int __blkdev_put(struct block_device *bdev, int for_part)
module_put(owner);
if (bdev->bd_contains != bdev) {
- kobject_put(&bdev->bd_part->dev.kobj);
+ disk_put_part(bdev->bd_part);
bdev->bd_part = NULL;
}
bdev->bd_disk = NULL;
diff --git a/fs/partitions/check.c b/fs/partitions/check.c
index e77fa144a07d..96c8bf41e455 100644
--- a/fs/partitions/check.c
+++ b/fs/partitions/check.c
@@ -314,19 +314,29 @@ static inline void disk_sysfs_add_subdirs(struct gendisk *disk)
kobject_put(k);
}
+static void delete_partition_rcu_cb(struct rcu_head *head)
+{
+ struct hd_struct *part = container_of(head, struct hd_struct, rcu_head);
+
+ part->start_sect = 0;
+ part->nr_sects = 0;
+ part_stat_set_all(part, 0);
+ put_device(&part->dev);
+}
+
void delete_partition(struct gendisk *disk, int partno)
{
- struct hd_struct *p = disk->part[partno - 1];
+ struct hd_struct *part;
- if (!p)
+ part = disk->__part[partno-1];
+ if (!part)
return;
- disk->part[partno - 1] = NULL;
- p->start_sect = 0;
- p->nr_sects = 0;
- part_stat_set_all(p, 0);
- kobject_put(p->holder_dir);
- device_del(&p->dev);
- put_device(&p->dev);
+
+ rcu_assign_pointer(disk->__part[partno-1], NULL);
+ kobject_put(part->holder_dir);
+ device_del(&part->dev);
+
+ call_rcu(&part->rcu_head, delete_partition_rcu_cb);
}
static ssize_t whole_disk_show(struct device *dev,
@@ -343,7 +353,7 @@ int add_partition(struct gendisk *disk, int partno,
struct hd_struct *p;
int err;
- if (disk->part[partno - 1])
+ if (disk->__part[partno - 1])
return -EBUSY;
p = kzalloc(sizeof(*p), GFP_KERNEL);
@@ -391,7 +401,8 @@ int add_partition(struct gendisk *disk, int partno,
}
/* everything is up and running, commence */
- disk->part[partno - 1] = p;
+ INIT_RCU_HEAD(&p->rcu_head);
+ rcu_assign_pointer(disk->__part[partno - 1], p);
/* suppress uevent if the disk supresses it */
if (!disk->dev.uevent_suppress)
@@ -414,9 +425,9 @@ out_put:
void register_disk(struct gendisk *disk)
{
struct block_device *bdev;
+ struct disk_part_iter piter;
+ struct hd_struct *part;
char *s;
- int i;
- struct hd_struct *p;
int err;
disk->dev.parent = disk->driverfs_dev;
@@ -466,16 +477,16 @@ exit:
kobject_uevent(&disk->dev.kobj, KOBJ_ADD);
/* announce possible partitions */
- for (i = 0; i < disk_max_parts(disk); i++) {
- p = disk->part[i];
- if (!p || !p->nr_sects)
- continue;
- kobject_uevent(&p->dev.kobj, KOBJ_ADD);
- }
+ disk_part_iter_init(&piter, disk, 0);
+ while ((part = disk_part_iter_next(&piter)))
+ kobject_uevent(&part->dev.kobj, KOBJ_ADD);
+ disk_part_iter_exit(&piter);
}
int rescan_partitions(struct gendisk *disk, struct block_device *bdev)
{
+ struct disk_part_iter piter;
+ struct hd_struct *part;
struct parsed_partitions *state;
int p, res;
@@ -485,8 +496,12 @@ int rescan_partitions(struct gendisk *disk, struct block_device *bdev)
if (res)
return res;
bdev->bd_invalidated = 0;
- for (p = 1; p <= disk_max_parts(disk); p++)
- delete_partition(disk, p);
+
+ disk_part_iter_init(&piter, disk, DISK_PITER_INCL_EMPTY);
+ while ((part = disk_part_iter_next(&piter)))
+ delete_partition(disk, part->partno);
+ disk_part_iter_exit(&piter);
+
if (disk->fops->revalidate_disk)
disk->fops->revalidate_disk(disk);
if (!get_capacity(disk) || !(state = check_partition(disk, bdev)))
@@ -545,13 +560,18 @@ EXPORT_SYMBOL(read_dev_sector);
void del_gendisk(struct gendisk *disk)
{
- int p;
+ struct disk_part_iter piter;
+ struct hd_struct *part;
/* invalidate stuff */
- for (p = disk_max_parts(disk); p > 0; p--) {
- invalidate_partition(disk, p);
- delete_partition(disk, p);
+ disk_part_iter_init(&piter, disk,
+ DISK_PITER_INCL_EMPTY | DISK_PITER_REVERSE);
+ while ((part = disk_part_iter_next(&piter))) {
+ invalidate_partition(disk, part->partno);
+ delete_partition(disk, part->partno);
}
+ disk_part_iter_exit(&piter);
+
invalidate_partition(disk, 0);
disk->capacity = 0;
disk->flags &= ~GENHD_FL_UP;
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-12 09:26:43 +0000