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Btrfs: restore restriper state on all mounts

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Fix a bug that triggered asserts in btrfs_balance() in both normal and
resume modes -- restriper state was not properly restored on read-only
mounts.  This factors out resuming code from btrfs_restore_balance(),
which is now also called earlier in the mount sequence to avoid the
problem of some early writes getting the old profile.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Ilya Dryomov 2012-06-22 12:24:12 -06:00 committed by Chris Mason
parent c3473e8300
commit 68310a5e42
3 changed files with 29 additions and 28 deletions
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10
fs/btrfs/disk-io.c
View File

@ -2354,12 +2354,17 @@ retry_root_backup:
BTRFS_CSUM_TREE_OBJECTID, csum_root);
if (ret)
goto recovery_tree_root;
csum_root->track_dirty = 1;
fs_info->generation = generation;
fs_info->last_trans_committed = generation;
ret = btrfs_recover_balance(fs_info);
if (ret) {
printk(KERN_WARNING "btrfs: failed to recover balance\n");
goto fail_block_groups;
}
ret = btrfs_init_dev_stats(fs_info);
if (ret) {
printk(KERN_ERR "btrfs: failed to init dev_stats: %d\n",
@ -2492,9 +2497,6 @@ retry_root_backup:
err = btrfs_orphan_cleanup(fs_info->tree_root);
up_read(&fs_info->cleanup_work_sem);
if (!err)
err = btrfs_recover_balance(fs_info->tree_root);
if (err) {
close_ctree(tree_root);
return err;

45
fs/btrfs/volumes.c
View File

@ -2867,9 +2867,8 @@ static int balance_kthread(void *data)
return ret;
}
int btrfs_recover_balance(struct btrfs_root *tree_root)
int btrfs_recover_balance(struct btrfs_fs_info *fs_info)
{
struct task_struct *tsk;
struct btrfs_balance_control *bctl;
struct btrfs_balance_item *item;
struct btrfs_disk_balance_args disk_bargs;
@ -2882,29 +2881,30 @@ int btrfs_recover_balance(struct btrfs_root *tree_root)
if (!path)
return -ENOMEM;
key.objectid = BTRFS_BALANCE_OBJECTID;
key.type = BTRFS_BALANCE_ITEM_KEY;
key.offset = 0;
ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0);
if (ret < 0)
goto out;
if (ret > 0) { /* ret = -ENOENT; */
ret = 0;
goto out;
}
bctl = kzalloc(sizeof(*bctl), GFP_NOFS);
if (!bctl) {
ret = -ENOMEM;
goto out;
}
key.objectid = BTRFS_BALANCE_OBJECTID;
key.type = BTRFS_BALANCE_ITEM_KEY;
key.offset = 0;
ret = btrfs_search_slot(NULL, tree_root, &key, path, 0, 0);
if (ret < 0)
goto out_bctl;
if (ret > 0) { /* ret = -ENOENT; */
ret = 0;
goto out_bctl;
}
leaf = path->nodes[0];
item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_balance_item);
bctl->fs_info = tree_root->fs_info;
bctl->flags = btrfs_balance_flags(leaf, item) | BTRFS_BALANCE_RESUME;
bctl->fs_info = fs_info;
bctl->flags = btrfs_balance_flags(leaf, item);
bctl->flags |= BTRFS_BALANCE_RESUME;
btrfs_balance_data(leaf, item, &disk_bargs);
btrfs_disk_balance_args_to_cpu(&bctl->data, &disk_bargs);
@ -2913,14 +2913,13 @@ int btrfs_recover_balance(struct btrfs_root *tree_root)
btrfs_balance_sys(leaf, item, &disk_bargs);
btrfs_disk_balance_args_to_cpu(&bctl->sys, &disk_bargs);
tsk = kthread_run(balance_kthread, bctl, "btrfs-balance");
if (IS_ERR(tsk))
ret = PTR_ERR(tsk);
else
goto out;
mutex_lock(&fs_info->volume_mutex);
mutex_lock(&fs_info->balance_mutex);
out_bctl:
kfree(bctl);
set_balance_control(bctl);
mutex_unlock(&fs_info->balance_mutex);
mutex_unlock(&fs_info->volume_mutex);
out:
btrfs_free_path(path);
return ret;

2
fs/btrfs/volumes.h
View File

@ -281,7 +281,7 @@ int btrfs_shrink_device(struct btrfs_device *device, u64 new_size);
int btrfs_init_new_device(struct btrfs_root *root, char *path);
int btrfs_balance(struct btrfs_balance_control *bctl,
struct btrfs_ioctl_balance_args *bargs);
int btrfs_recover_balance(struct btrfs_root *tree_root);
int btrfs_recover_balance(struct btrfs_fs_info *fs_info);
int btrfs_pause_balance(struct btrfs_fs_info *fs_info);
int btrfs_cancel_balance(struct btrfs_fs_info *fs_info);
int btrfs_chunk_readonly(struct btrfs_root *root, u64 chunk_offset);