diff options
| -rw-r--r-- | block/partition-generic.c | 172 |
1 files changed, 94 insertions, 78 deletions
diff --git a/block/partition-generic.c b/block/partition-generic.c index 31bff3fb28af..7eabb67f99b5 100644 --- a/block/partition-generic.c +++ b/block/partition-generic.c @@ -459,128 +459,144 @@ static int drop_partitions(struct gendisk *disk, struct block_device *bdev) 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->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_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; +} + +static int blk_add_partitions(struct gendisk *disk, struct block_device *bdev) +{ + struct parsed_partitions *state; + int ret = -EAGAIN, p, highest; + + 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; + for (p = 1; p < state->limit; p++) + if (!blk_add_partition(disk, bdev, state, p)) + goto out_free_state; - size = state->parts[p].size; - if (!size) - continue; + ret = 0; +out_free_state: + free_partitions(state); + return ret; +} - 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; - } +int rescan_partitions(struct gendisk *disk, struct block_device *bdev) +{ + int ret; - 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; - } - } +rescan: + ret = drop_partitions(disk, bdev); + if (ret) + return ret; - 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: - free_partitions(state); - return 0; + 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)) + return 0; + + ret = blk_add_partitions(disk, bdev); + if (ret == -EAGAIN) + goto rescan; + return ret; } int invalidate_partitions(struct gendisk *disk, struct block_device *bdev) |