}
}
-/*
- * This is an exported API for the block driver, and will not
- * acquire bd_mutex. This API should be used in case that
- * caller has held bd_mutex already.
- */
-int __blkdev_reread_part(struct block_device *bdev)
+static int blkdev_reread_part(struct block_device *bdev)
{
- struct gendisk *disk = bdev->bd_disk;
+ int ret;
- if (!disk_part_scan_enabled(disk) || bdev != bdev->bd_contains)
+ if (!disk_part_scan_enabled(bdev->bd_disk) || bdev != bdev->bd_contains)
return -EINVAL;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
- lockdep_assert_held(&bdev->bd_mutex);
-
- return rescan_partitions(disk, bdev);
-}
-EXPORT_SYMBOL(__blkdev_reread_part);
-
-/*
- * This is an exported API for the block driver, and will
- * try to acquire bd_mutex. If bd_mutex has been held already
- * in current context, please call __blkdev_reread_part().
- *
- * Make sure the held locks in current context aren't required
- * in open()/close() handler and I/O path for avoiding ABBA deadlock:
- * - bd_mutex is held before calling block driver's open/close
- * handler
- * - reading partition table may submit I/O to the block device
- */
-int blkdev_reread_part(struct block_device *bdev)
-{
- int res;
-
mutex_lock(&bdev->bd_mutex);
- res = __blkdev_reread_part(bdev);
+ ret = bdev_disk_changed(bdev, false);
mutex_unlock(&bdev->bd_mutex);
- return res;
+ return ret;
}
-EXPORT_SYMBOL(blkdev_reread_part);
static int blk_ioctl_discard(struct block_device *bdev, fmode_t mode,
unsigned long arg, unsigned long flags)
}
}
-static int drop_partitions(struct gendisk *disk, struct block_device *bdev)
+int blk_drop_partitions(struct gendisk *disk, struct block_device *bdev)
{
struct disk_part_iter piter;
struct hd_struct *part;
int res;
+ if (!disk_part_scan_enabled(disk))
+ return 0;
if (bdev->bd_part_count || bdev->bd_super)
return -EBUSY;
res = invalidate_partition(disk, 0);
return 0;
}
-int rescan_partitions(struct gendisk *disk, struct block_device *bdev)
+static bool blk_add_partition(struct gendisk *disk, struct block_device *bdev,
+ struct parsed_partitions *state, int p)
{
- struct parsed_partitions *state = NULL;
+ sector_t size = state->parts[p].size;
+ sector_t from = state->parts[p].from;
struct hd_struct *part;
- int p, highest, res;
-rescan:
- if (state && !IS_ERR(state)) {
- free_partitions(state);
- state = NULL;
+
+ if (!size)
+ return true;
+
+ if (from >= get_capacity(disk)) {
+ printk(KERN_WARNING
+ "%s: p%d start %llu is beyond EOD, ",
+ disk->disk_name, p, (unsigned long long) from);
+ if (disk_unlock_native_capacity(disk))
+ return false;
+ return true;
}
- res = drop_partitions(disk, bdev);
- if (res)
- return res;
+ if (from + size > get_capacity(disk)) {
+ printk(KERN_WARNING
+ "%s: p%d size %llu extends beyond EOD, ",
+ disk->disk_name, p, (unsigned long long) size);
+
+ if (disk_unlock_native_capacity(disk))
+ return false;
+
+ /*
+ * We can not ignore partitions of broken tables created by for
+ * example camera firmware, but we limit them to the end of the
+ * disk to avoid creating invalid block devices.
+ */
+ size = get_capacity(disk) - from;
+ }
+
+ part = add_partition(disk, p, from, size, state->parts[p].flags,
+ &state->parts[p].info);
+ if (IS_ERR(part)) {
+ printk(KERN_ERR " %s: p%d could not be added: %ld\n",
+ disk->disk_name, p, -PTR_ERR(part));
+ return true;
+ }
+
+#ifdef CONFIG_BLK_DEV_MD
+ if (state->parts[p].flags & ADDPART_FLAG_RAID)
+ md_autodetect_dev(part_to_dev(part)->devt);
+#endif
+ return true;
+}
+
+int blk_add_partitions(struct gendisk *disk, struct block_device *bdev)
+{
+ struct parsed_partitions *state;
+ int ret = -EAGAIN, p, highest;
- if (disk->fops->revalidate_disk)
- disk->fops->revalidate_disk(disk);
- check_disk_size_change(disk, bdev, true);
- bdev->bd_invalidated = 0;
- if (!get_capacity(disk) || !(state = check_partition(disk, bdev)))
+ if (!disk_part_scan_enabled(disk))
+ return 0;
+
+ state = check_partition(disk, bdev);
+ if (!state)
return 0;
if (IS_ERR(state)) {
/*
- * I/O error reading the partition table. If any
- * partition code tried to read beyond EOD, retry
- * after unlocking native capacity.
+ * I/O error reading the partition table. If we tried to read
+ * beyond EOD, retry after unlocking the native capacity.
*/
if (PTR_ERR(state) == -ENOSPC) {
printk(KERN_WARNING "%s: partition table beyond EOD, ",
disk->disk_name);
if (disk_unlock_native_capacity(disk))
- goto rescan;
+ return -EAGAIN;
}
return -EIO;
}
- /* Partitions are not supported on zoned block devices */
+ /*
+ * Partitions are not supported on zoned block devices.
+ */
if (bdev_is_zoned(bdev)) {
pr_warn("%s: ignoring partition table on zoned block device\n",
disk->disk_name);
- goto out;
+ ret = 0;
+ goto out_free_state;
}
/*
- * If any partition code tried to read beyond EOD, try
- * unlocking native capacity even if partition table is
- * successfully read as we could be missing some partitions.
+ * If we read beyond EOD, try unlocking native capacity even if the
+ * partition table was successfully read as we could be missing some
+ * partitions.
*/
if (state->access_beyond_eod) {
printk(KERN_WARNING
"%s: partition table partially beyond EOD, ",
disk->disk_name);
if (disk_unlock_native_capacity(disk))
- goto rescan;
+ goto out_free_state;
}
/* tell userspace that the media / partition table may have changed */
kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE);
- /* Detect the highest partition number and preallocate
- * disk->part_tbl. This is an optimization and not strictly
- * necessary.
+ /*
+ * Detect the highest partition number and preallocate disk->part_tbl.
+ * This is an optimization and not strictly necessary.
*/
for (p = 1, highest = 0; p < state->limit; p++)
if (state->parts[p].size)
highest = p;
-
disk_expand_part_tbl(disk, highest);
- /* add partitions */
- for (p = 1; p < state->limit; p++) {
- sector_t size, from;
-
- size = state->parts[p].size;
- if (!size)
- continue;
-
- from = state->parts[p].from;
- if (from >= get_capacity(disk)) {
- printk(KERN_WARNING
- "%s: p%d start %llu is beyond EOD, ",
- disk->disk_name, p, (unsigned long long) from);
- if (disk_unlock_native_capacity(disk))
- goto rescan;
- continue;
- }
-
- if (from + size > get_capacity(disk)) {
- printk(KERN_WARNING
- "%s: p%d size %llu extends beyond EOD, ",
- disk->disk_name, p, (unsigned long long) size);
-
- if (disk_unlock_native_capacity(disk)) {
- /* free state and restart */
- goto rescan;
- } else {
- /*
- * we can not ignore partitions of broken tables
- * created by for example camera firmware, but
- * we limit them to the end of the disk to avoid
- * creating invalid block devices
- */
- size = get_capacity(disk) - from;
- }
- }
+ for (p = 1; p < state->limit; p++)
+ if (!blk_add_partition(disk, bdev, state, p))
+ goto out_free_state;
- part = add_partition(disk, p, from, size,
- state->parts[p].flags,
- &state->parts[p].info);
- if (IS_ERR(part)) {
- printk(KERN_ERR " %s: p%d could not be added: %ld\n",
- disk->disk_name, p, -PTR_ERR(part));
- continue;
- }
-#ifdef CONFIG_BLK_DEV_MD
- if (state->parts[p].flags & ADDPART_FLAG_RAID)
- md_autodetect_dev(part_to_dev(part)->devt);
-#endif
- }
-out:
+ ret = 0;
+out_free_state:
free_partitions(state);
- return 0;
-}
-
-int invalidate_partitions(struct gendisk *disk, struct block_device *bdev)
-{
- int res;
-
- if (!bdev->bd_invalidated)
- return 0;
-
- res = drop_partitions(disk, bdev);
- if (res)
- return res;
-
- set_capacity(disk, 0);
- check_disk_size_change(disk, bdev, false);
- bdev->bd_invalidated = 0;
- /* tell userspace that the media / partition table may have changed */
- kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE);
-
- return 0;
+ return ret;
}
unsigned char *read_dev_sector(struct block_device *bdev, sector_t n, Sector *p)
* and adjusts it if it differs. When shrinking the bdev size, its all caches
* are freed.
*/
-void check_disk_size_change(struct gendisk *disk, struct block_device *bdev,
- bool verbose)
+static void check_disk_size_change(struct gendisk *disk,
+ struct block_device *bdev, bool verbose)
{
loff_t disk_size, bdev_size;
if (bdev_size > disk_size)
flush_disk(bdev, false);
}
+ bdev->bd_invalidated = 0;
}
/**
mutex_lock(&bdev->bd_mutex);
check_disk_size_change(disk, bdev, ret == 0);
- bdev->bd_invalidated = 0;
mutex_unlock(&bdev->bd_mutex);
bdput(bdev);
}
static void __blkdev_put(struct block_device *bdev, fmode_t mode, int for_part);
-static void bdev_disk_changed(struct block_device *bdev, bool invalidate)
+int bdev_disk_changed(struct block_device *bdev, bool invalidate)
{
- if (disk_part_scan_enabled(bdev->bd_disk)) {
- if (invalidate)
- invalidate_partitions(bdev->bd_disk, bdev);
- else
- rescan_partitions(bdev->bd_disk, bdev);
+ struct gendisk *disk = bdev->bd_disk;
+ int ret;
+
+ lockdep_assert_held(&bdev->bd_mutex);
+
+rescan:
+ ret = blk_drop_partitions(disk, bdev);
+ if (ret)
+ return ret;
+
+ if (invalidate)
+ set_capacity(disk, 0);
+ else if (disk->fops->revalidate_disk)
+ disk->fops->revalidate_disk(disk);
+
+ check_disk_size_change(disk, bdev, !invalidate);
+
+ if (get_capacity(disk)) {
+ ret = blk_add_partitions(disk, bdev);
+ if (ret == -EAGAIN)
+ goto rescan;
} else {
- check_disk_size_change(bdev->bd_disk, bdev, !invalidate);
- bdev->bd_invalidated = 0;
+ /*
+ * Tell userspace that the media / partition table may have
+ * changed.
+ */
+ kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE);
}
+
+ return ret;
}
+/*
+ * Only exported for for loop and dasd for historic reasons. Don't use in new
+ * code!
+ */
+EXPORT_SYMBOL_GPL(bdev_disk_changed);
/*
* bd_mutex locking:
projects / linux-2.6-microblaze.git / commitdiff