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Btrfs: Add back pointers from extents to the btree or file referencing them

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Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason
2007-12-11 09:25:06 -05:00
parent 74493f7a59
commit 7bb86316c3
8 changed files with 577 additions and 105 deletions
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38
fs/btrfs/inode.c
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@@ -93,7 +93,9 @@ static int run_delalloc_range(struct inode *inode, u64 start, u64 end)
if (alloc_hint == EXTENT_MAP_INLINE)
goto out;
ret = btrfs_alloc_extent(trans, root, inode->i_ino, num_bytes, 0,
ret = btrfs_alloc_extent(trans, root, num_bytes,
root->root_key.objectid, trans->transid,
inode->i_ino, start, 0,
alloc_hint, (u64)-1, &ins, 1);
if (ret) {
WARN_ON(1);
@@ -560,6 +562,7 @@ static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans,
u64 extent_start = 0;
u64 extent_num_bytes = 0;
u64 item_end = 0;
u64 root_gen = 0;
int found_extent;
int del_item;
int extent_type = -1;
@@ -670,6 +673,15 @@ static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans,
found_extent = 1;
inode->i_blocks -= num_dec;
}
if (leaf == root->node) {
root_gen =
btrfs_header_generation(leaf);
} else {
struct extent_buffer *parent;
parent = path->nodes[1];
root_gen =
btrfs_header_generation(parent);
}
}
} else if (extent_type == BTRFS_FILE_EXTENT_INLINE &&
!del_item) {
@@ -690,7 +702,10 @@ delete:
btrfs_release_path(root, path);
if (found_extent) {
ret = btrfs_free_extent(trans, root, extent_start,
extent_num_bytes, 0);
extent_num_bytes,
root->root_key.objectid,
root_gen, inode->i_ino,
found_key.offset, 0);
BUG_ON(ret);
}
}
@@ -1900,7 +1915,14 @@ static int create_subvol(struct btrfs_root *root, char *name, int namelen)
trans = btrfs_start_transaction(root, 1);
BUG_ON(!trans);
leaf = btrfs_alloc_free_block(trans, root, root->leafsize, 0, 0);
ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root,
0, &objectid);
if (ret)
goto fail;
leaf = __btrfs_alloc_free_block(trans, root, root->leafsize,
objectid, trans->transid, 0, 0,
0, 0);
if (IS_ERR(leaf))
return PTR_ERR(leaf);
@@ -1908,7 +1930,8 @@ static int create_subvol(struct btrfs_root *root, char *name, int namelen)
btrfs_set_header_level(leaf, 0);
btrfs_set_header_bytenr(leaf, leaf->start);
btrfs_set_header_generation(leaf, trans->transid);
btrfs_set_header_owner(leaf, root->root_key.objectid);
btrfs_set_header_owner(leaf, objectid);
write_extent_buffer(leaf, root->fs_info->fsid,
(unsigned long)btrfs_header_fsid(leaf),
BTRFS_FSID_SIZE);
@@ -1933,11 +1956,6 @@ static int create_subvol(struct btrfs_root *root, char *name, int namelen)
free_extent_buffer(leaf);
leaf = NULL;
ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root,
0, &objectid);
if (ret)
goto fail;
btrfs_set_root_dirid(&root_item, new_dirid);
key.objectid = objectid;
@@ -2056,7 +2074,7 @@ static int create_snapshot(struct btrfs_root *root, char *name, int namelen)
if (ret)
goto fail;
ret = btrfs_inc_root_ref(trans, root);
ret = btrfs_inc_root_ref(trans, root, objectid);
if (ret)
goto fail;
fail: