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Btrfs: enhance btrfs_scratch_superblock to scratch all superblocks

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This patch updates and renames btrfs_scratch_superblocks, (which is used
by the replace device thread), with those fixes from the scratch
superblock code section of btrfs_rm_device(). The fixes are:
  Scratch all copies of superblock
  Notify kobject that superblock has been changed
  Update time on the device

So that btrfs_rm_device() can use the function
btrfs_scratch_superblocks() instead of its own scratch code. And further
replace deivce code which similarly releases device back to the system,
will have the fixes from the btrfs device delete.

Signed-off-by: Anand Jain <anand.jain@oracle.com>
[renamed to btrfs_scratch_superblock]
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Anand Jain 2015-08-14 18:32:59 +08:00 committed by David Sterba
parent 29c36d7253
commit 12b1c2637b
2 changed files with 27 additions and 13 deletions
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28
fs/btrfs/volumes.c
View file

@ -1924,7 +1924,8 @@ void btrfs_rm_dev_replace_remove_srcdev(struct btrfs_fs_info *fs_info,
if (srcdev->writeable) {
fs_devices->rw_devices--;
/* zero out the old super if it is writable */
btrfs_scratch_superblock(srcdev);
btrfs_scratch_superblocks(srcdev->bdev,
rcu_str_deref(srcdev->name));
}
if (srcdev->bdev)
@ -1974,7 +1975,8 @@ void btrfs_destroy_dev_replace_tgtdev(struct btrfs_fs_info *fs_info,
btrfs_sysfs_rm_device_link(fs_info->fs_devices, tgtdev);
if (tgtdev->bdev) {
btrfs_scratch_superblock(tgtdev);
btrfs_scratch_superblocks(tgtdev->bdev,
rcu_str_deref(tgtdev->name));
fs_info->fs_devices->open_devices--;
}
fs_info->fs_devices->num_devices--;
@ -6738,22 +6740,34 @@ int btrfs_get_dev_stats(struct btrfs_root *root,
return 0;
}
int btrfs_scratch_superblock(struct btrfs_device *device)
void btrfs_scratch_superblocks(struct block_device *bdev, char *device_path)
{
struct buffer_head *bh;
struct btrfs_super_block *disk_super;
int copy_num;
if (!bdev)
return;
for (copy_num = 0; copy_num < BTRFS_SUPER_MIRROR_MAX;
copy_num++) {
if (btrfs_read_dev_one_super(bdev, copy_num, &bh))
continue;
bh = btrfs_read_dev_super(device->bdev);
if (IS_ERR(bh))
return PTR_ERR(bh);
disk_super = (struct btrfs_super_block *)bh->b_data;
memset(&disk_super->magic, 0, sizeof(disk_super->magic));
set_buffer_dirty(bh);
sync_dirty_buffer(bh);
brelse(bh);
}
return 0;
/* Notify udev that device has changed */
btrfs_kobject_uevent(bdev, KOBJ_CHANGE);
/* Update ctime/mtime for device path for libblkid */
update_dev_time(device_path);
}
/*

2
fs/btrfs/volumes.h
View file

@ -474,7 +474,7 @@ void btrfs_destroy_dev_replace_tgtdev(struct btrfs_fs_info *fs_info,
struct btrfs_device *tgtdev);
void btrfs_init_dev_replace_tgtdev_for_resume(struct btrfs_fs_info *fs_info,
struct btrfs_device *tgtdev);
int btrfs_scratch_superblock(struct btrfs_device *device);
void btrfs_scratch_superblocks(struct block_device *bdev, char *device_path);
int btrfs_is_parity_mirror(struct btrfs_mapping_tree *map_tree,
u64 logical, u64 len, int mirror_num);
unsigned long btrfs_full_stripe_len(struct btrfs_root *root,