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btrfs: sanitizing ->fs_info, part 4

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A new helper: btrfs_alloc_root(fs_info); allocates btrfs_root
and sets ->fs_info.  All places allocating the suckers converted
to it.  At that point we *never* reassign ->fs_info of btrfs_root;
it's set before anyone sees the address of newly allocated
struct btrfs_root and never assigned anywhere else.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2011-11-17 00:46:16 -05:00
parent 38a77db49a
commit 6f07e42ee6
3 changed files with 18 additions and 20 deletions
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33
fs/btrfs/disk-io.c
View file

@ -1215,6 +1215,14 @@ static int find_and_setup_root(struct btrfs_root *tree_root,
return 0;
}
struct btrfs_root *btrfs_alloc_root(struct btrfs_fs_info *fs_info)
{
struct btrfs_root *root = kzalloc(sizeof(*root), GFP_NOFS);
if (root)
root->fs_info = fs_info;
return root;
}
static struct btrfs_root *alloc_log_tree(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info)
{
@ -1222,11 +1230,10 @@ static struct btrfs_root *alloc_log_tree(struct btrfs_trans_handle *trans,
struct btrfs_root *tree_root = fs_info->tree_root;
struct extent_buffer *leaf;
root = kzalloc(sizeof(*root), GFP_NOFS);
root = btrfs_alloc_root(fs_info);
if (!root)
return ERR_PTR(-ENOMEM);
root->fs_info = fs_info;
__setup_root(tree_root->nodesize, tree_root->leafsize,
tree_root->sectorsize, tree_root->stripesize,
root, fs_info, BTRFS_TREE_LOG_OBJECTID);
@ -1317,10 +1324,9 @@ struct btrfs_root *btrfs_read_fs_root_no_radix(struct btrfs_root *tree_root,
u32 blocksize;
int ret = 0;
root = kzalloc(sizeof(*root), GFP_NOFS);
root = btrfs_alloc_root(fs_info);
if (!root)
return ERR_PTR(-ENOMEM);
root->fs_info = fs_info;
if (location->offset == (u64)-1) {
ret = find_and_setup_root(tree_root, fs_info,
location->objectid, root);
@ -1900,23 +1906,15 @@ struct btrfs_root *open_ctree(struct super_block *sb,
int num_backups_tried = 0;
int backup_index = 0;
extent_root = fs_info->extent_root =
kzalloc(sizeof(struct btrfs_root), GFP_NOFS);
csum_root = fs_info->csum_root =
kzalloc(sizeof(struct btrfs_root), GFP_NOFS);
chunk_root = fs_info->chunk_root =
kzalloc(sizeof(struct btrfs_root), GFP_NOFS);
dev_root = fs_info->dev_root =
kzalloc(sizeof(struct btrfs_root), GFP_NOFS);
extent_root = fs_info->extent_root = btrfs_alloc_root(fs_info);
csum_root = fs_info->csum_root = btrfs_alloc_root(fs_info);
chunk_root = fs_info->chunk_root = btrfs_alloc_root(fs_info);
dev_root = fs_info->dev_root = btrfs_alloc_root(fs_info);
if (!extent_root || !csum_root || !chunk_root || !dev_root) {
err = -ENOMEM;
goto fail;
}
chunk_root->fs_info = fs_info;
extent_root->fs_info = fs_info;
dev_root->fs_info = fs_info;
csum_root->fs_info = fs_info;
ret = init_srcu_struct(&fs_info->subvol_srcu);
if (ret) {
@ -2372,13 +2370,12 @@ struct btrfs_root *open_ctree(struct super_block *sb,
btrfs_level_size(tree_root,
btrfs_super_log_root_level(disk_super));
log_tree_root = kzalloc(sizeof(struct btrfs_root), GFP_NOFS);
log_tree_root = btrfs_alloc_root(fs_info);
if (!log_tree_root) {
err = -ENOMEM;
goto fail_trans_kthread;
}
log_tree_root->fs_info = fs_info;
__setup_root(nodesize, leafsize, sectorsize, stripesize,
log_tree_root, fs_info, BTRFS_TREE_LOG_OBJECTID);

2
fs/btrfs/disk-io.h
View file

@ -86,6 +86,8 @@ int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans,
int btrfs_add_log_tree(struct btrfs_trans_handle *trans,
struct btrfs_root *root);
struct btrfs_root *btrfs_alloc_root(struct btrfs_fs_info *fs_info);
#ifdef CONFIG_DEBUG_LOCK_ALLOC
void btrfs_init_lockdep(void);
void btrfs_set_buffer_lockdep_class(u64 objectid,

3
fs/btrfs/super.c
View file

@ -901,12 +901,11 @@ static struct dentry *btrfs_mount(struct file_system_type *fs_type, int flags,
if (!fs_info)
return ERR_PTR(-ENOMEM);
fs_info->tree_root = kzalloc(sizeof(struct btrfs_root), GFP_NOFS);
fs_info->tree_root = btrfs_alloc_root(fs_info);
if (!fs_info->tree_root) {
error = -ENOMEM;
goto error_fs_info;
}
fs_info->tree_root->fs_info = fs_info;
fs_info->fs_devices = fs_devices;
fs_info->super_copy = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_NOFS);