diff options
| -rw-r--r-- | fs/partitions/check.c | 69 | ||||
| -rw-r--r-- | fs/partitions/check.h | 5 |
2 files changed, 60 insertions, 14 deletions
diff --git a/fs/partitions/check.c b/fs/partitions/check.c index a19995c6f6a..5dcd4b0c553 100644 --- a/fs/partitions/check.c +++ b/fs/partitions/check.c @@ -161,7 +161,7 @@ check_partition(struct gendisk *hd, struct block_device *bdev) struct parsed_partitions *state; int i, res, err; - state = kmalloc(sizeof(struct parsed_partitions), GFP_KERNEL); + state = kzalloc(sizeof(struct parsed_partitions), GFP_KERNEL); if (!state) return NULL; @@ -187,6 +187,8 @@ check_partition(struct gendisk *hd, struct block_device *bdev) } if (res > 0) return state; + if (state->access_beyond_eod) + err = -ENOSPC; if (err) /* The partition is unrecognized. So report I/O errors if there were any */ res = err; @@ -539,13 +541,34 @@ exit: disk_part_iter_exit(&piter); } +static bool disk_unlock_native_capacity(struct gendisk *disk) +{ + const struct block_device_operations *bdops = disk->fops; + + if (bdops->unlock_native_capacity && + !(disk->flags & GENHD_FL_NATIVE_CAPACITY)) { + printk(KERN_CONT "enabling native capacity\n"); + bdops->unlock_native_capacity(disk); + disk->flags |= GENHD_FL_NATIVE_CAPACITY; + return true; + } else { + printk(KERN_CONT "truncated\n"); + return false; + } +} + int rescan_partitions(struct gendisk *disk, struct block_device *bdev) { + struct parsed_partitions *state = NULL; struct disk_part_iter piter; struct hd_struct *part; - struct parsed_partitions *state; int p, highest, res; rescan: + if (state && !IS_ERR(state)) { + kfree(state); + state = NULL; + } + if (bdev->bd_part_count) return -EBUSY; res = invalidate_partition(disk, 0); @@ -563,8 +586,32 @@ rescan: bdev->bd_invalidated = 0; if (!get_capacity(disk) || !(state = check_partition(disk, bdev))) return 0; - if (IS_ERR(state)) /* I/O error reading the partition table */ + 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. + */ + 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 -EIO; + } + /* + * If any partition code tried to read beyond EOD, try + * unlocking native capacity even if partition table is + * sucessfully 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; + } /* tell userspace that the media / partition table may have changed */ kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE); @@ -590,25 +637,20 @@ rescan: from = state->parts[p].from; if (from >= get_capacity(disk)) { printk(KERN_WARNING - "%s: p%d ignored, start %llu is behind the end of the disk\n", + "%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)) { - const struct block_device_operations *bdops = disk->fops; - printk(KERN_WARNING - "%s: p%d size %llu exceeds device capacity, ", + "%s: p%d size %llu extends beyond EOD, ", disk->disk_name, p, (unsigned long long) size); - if (bdops->unlock_native_capacity && - (disk->flags & GENHD_FL_NATIVE_CAPACITY) == 0) { - printk(KERN_CONT "enabling native capacity\n"); - bdops->unlock_native_capacity(disk); - disk->flags |= GENHD_FL_NATIVE_CAPACITY; + if (disk_unlock_native_capacity(disk)) { /* free state and restart */ - kfree(state); goto rescan; } else { /* @@ -617,7 +659,6 @@ rescan: * we limit them to the end of the disk to avoid * creating invalid block devices */ - printk(KERN_CONT "limited to end of disk\n"); size = get_capacity(disk) - from; } } diff --git a/fs/partitions/check.h b/fs/partitions/check.h index 4b31a97775b..52f8bd39939 100644 --- a/fs/partitions/check.h +++ b/fs/partitions/check.h @@ -15,11 +15,16 @@ struct parsed_partitions { } parts[DISK_MAX_PARTS]; int next; int limit; + bool access_beyond_eod; }; static inline void *read_part_sector(struct parsed_partitions *state, sector_t n, Sector *p) { + if (n >= get_capacity(state->bdev->bd_disk)) { + state->access_beyond_eod = true; + return NULL; + } return read_dev_sector(state->bdev, n, p); } |