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Btrfs: shared seed device

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This patch makes seed device possible to be shared by
multiple mounted file systems. The sharing is achieved
by cloning seed device's btrfs_fs_devices structure.
Thanks you,

Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
This commit is contained in:
Yan Zheng 2008-12-12 10:03:26 -05:00 • committed by Chris Mason
parent d2fb3437e4
commit e4404d6e8d
5 changed files with 156 additions and 134 deletions
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37
fs/btrfs/extent-tree.c
View file

@ -218,7 +218,7 @@ static int cache_block_group(struct btrfs_root *root,
struct btrfs_key key;
struct extent_buffer *leaf;
int slot;
u64 last = block_group->key.objectid;
u64 last;
if (!block_group)
return 0;
@ -239,7 +239,8 @@ static int cache_block_group(struct btrfs_root *root,
* skip the locking here
*/
path->skip_locking = 1;
key.objectid = max_t(u64, last, BTRFS_SUPER_INFO_OFFSET);
last = max_t(u64, block_group->key.objectid, BTRFS_SUPER_INFO_OFFSET);
key.objectid = last;
key.offset = 0;
btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY);
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
@ -5335,8 +5336,20 @@ static int noinline relocate_one_extent(struct btrfs_root *extent_root,
prev_block = block_start;
}
if (ref_path->owner_objectid >= BTRFS_FIRST_FREE_OBJECTID &&
pass >= 2) {
btrfs_record_root_in_trans(found_root);
if (ref_path->owner_objectid >= BTRFS_FIRST_FREE_OBJECTID) {
/*
* try to update data extent references while
* keeping metadata shared between snapshots.
*/
if (pass == 1) {
ret = relocate_one_path(trans, found_root,
path, &first_key, ref_path,
group, reloc_inode);
if (ret < 0)
goto out;
continue;
}
/*
* use fallback method to process the remaining
* references.
@ -5359,23 +5372,9 @@ static int noinline relocate_one_extent(struct btrfs_root *extent_root,
path, extent_key,
&first_key, ref_path,
new_extents, nr_extents);
if (ret < 0)
goto out;
continue;
}
btrfs_record_root_in_trans(found_root);
if (ref_path->owner_objectid < BTRFS_FIRST_FREE_OBJECTID) {
} else {
ret = relocate_tree_block(trans, found_root, path,
&first_key, ref_path);
} else {
/*
* try to update data extent references while
* keeping metadata shared between snapshots.
*/
ret = relocate_one_path(trans, found_root, path,
&first_key, ref_path,
group, reloc_inode);
}
if (ret < 0)
goto out;