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Btrfs: Change the super to point to a tree of trees to enable persistent snapshots

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Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason
2007-03-13 16:47:54 -04:00
committed by David Woodhouse
parent eaee50e881
commit 3768f3689f
10 changed files with 445 additions and 65 deletions
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15
fs/btrfs/extent-tree.c
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@ -82,7 +82,7 @@ int btrfs_inc_ref(struct btrfs_root *root, struct btrfs_buffer *buf)
u64 blocknr;
int i;
if (root == root->extent_root)
if (!root->ref_cows)
return 0;
if (btrfs_is_leaf(&buf->node))
return 0;
@ -96,23 +96,22 @@ int btrfs_inc_ref(struct btrfs_root *root, struct btrfs_buffer *buf)
int btrfs_finish_extent_commit(struct btrfs_root *root)
{
struct btrfs_root *extent_root = root->extent_root;
unsigned long gang[8];
int ret;
int i;
while(1) {
ret = radix_tree_gang_lookup(&extent_root->pinned_radix,
ret = radix_tree_gang_lookup(&root->pinned_radix,
(void **)gang, 0,
ARRAY_SIZE(gang));
if (!ret)
break;
for (i = 0; i < ret; i++) {
radix_tree_delete(&extent_root->pinned_radix, gang[i]);
radix_tree_delete(&root->pinned_radix, gang[i]);
}
}
extent_root->last_insert.objectid = 0;
extent_root->last_insert.offset = 0;
root->last_insert.objectid = 0;
root->last_insert.offset = 0;
return 0;
}
@ -173,7 +172,7 @@ static int __free_extent(struct btrfs_root *root, u64 blocknr, u64 num_blocks)
refs = btrfs_extent_refs(ei) - 1;
btrfs_set_extent_refs(ei, refs);
if (refs == 0) {
if (root == extent_root) {
if (!root->ref_cows) {
int err;
radix_tree_preload(GFP_KERNEL);
err = radix_tree_insert(&extent_root->pinned_radix,
@ -513,7 +512,7 @@ static int walk_up_tree(struct btrfs_root *root, struct btrfs_path *path,
*/
int btrfs_drop_snapshot(struct btrfs_root *root, struct btrfs_buffer *snap)
{
int ret = 0;;
int ret = 0;
int wret;
int level;
struct btrfs_path path;