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btrfs: let ->s_fs_info point to fs_info, not root... 

the latter can be obtained from the former (by looking as ->tree_root)
just as cheaply as we currently are doing the other way round.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2011-11-17 15:40:49 -05:00
parent 59553edf11
commit 815745cf3e
5 changed files with 45 additions and 45 deletions
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2
fs/btrfs/ctree.h
View File

@ -2196,7 +2196,7 @@ static inline u32 btrfs_file_extent_inline_item_len(struct extent_buffer *eb,
return btrfs_item_size(eb, e) - offset;
}
static inline struct btrfs_root *btrfs_sb(struct super_block *sb)
static inline struct btrfs_fs_info *btrfs_sb(struct super_block *sb)
{
return sb->s_fs_info;
}

4
fs/btrfs/disk-io.c
View File

@ -1894,8 +1894,8 @@ int open_ctree(struct super_block *sb,
struct btrfs_key location;
struct buffer_head *bh;
struct btrfs_super_block *disk_super;
struct btrfs_root *tree_root = btrfs_sb(sb);
struct btrfs_fs_info *fs_info = tree_root->fs_info;
struct btrfs_fs_info *fs_info = btrfs_sb(sb);
struct btrfs_root *tree_root = fs_info->tree_root;
struct btrfs_root *extent_root;
struct btrfs_root *csum_root;
struct btrfs_root *chunk_root;

2
fs/btrfs/export.c
View File

@ -67,7 +67,7 @@ static struct dentry *btrfs_get_dentry(struct super_block *sb, u64 objectid,
u64 root_objectid, u32 generation,
int check_generation)
{
struct btrfs_fs_info *fs_info = btrfs_sb(sb)->fs_info;
struct btrfs_fs_info *fs_info = btrfs_sb(sb);
struct btrfs_root *root;
struct inode *inode;
struct btrfs_key key;

7
fs/btrfs/ioctl.c
View File

@ -276,14 +276,13 @@ static int btrfs_ioctl_getversion(struct file *file, int __user *arg)
static noinline int btrfs_ioctl_fitrim(struct file *file, void __user *arg)
{
struct btrfs_root *root = fdentry(file)->d_sb->s_fs_info;
struct btrfs_fs_info *fs_info = root->fs_info;
struct btrfs_fs_info *fs_info = btrfs_sb(fdentry(file)->d_sb);
struct btrfs_device *device;
struct request_queue *q;
struct fstrim_range range;
u64 minlen = ULLONG_MAX;
u64 num_devices = 0;
u64 total_bytes = btrfs_super_total_bytes(root->fs_info->super_copy);
u64 total_bytes = btrfs_super_total_bytes(fs_info->super_copy);
int ret;
if (!capable(CAP_SYS_ADMIN))
@ -312,7 +311,7 @@ static noinline int btrfs_ioctl_fitrim(struct file *file, void __user *arg)
range.len = min(range.len, total_bytes - range.start);
range.minlen = max(range.minlen, minlen);
ret = btrfs_trim_fs(root, &range);
ret = btrfs_trim_fs(fs_info->tree_root, &range);
if (ret < 0)
return ret;

75
fs/btrfs/super.c
View File

@ -147,7 +147,7 @@ void __btrfs_std_error(struct btrfs_fs_info *fs_info, const char *function,
static void btrfs_put_super(struct super_block *sb)
{
(void)close_ctree(btrfs_sb(sb));
(void)close_ctree(btrfs_sb(sb)->tree_root);
/* FIXME: need to fix VFS to return error? */
/* AV: return it _where_? ->put_super() can be triggered by any number
* of async events, up to and including delivery of SIGKILL to the
@ -500,7 +500,8 @@ out:
static struct dentry *get_default_root(struct super_block *sb,
u64 subvol_objectid)
{
struct btrfs_root *root = sb->s_fs_info;
struct btrfs_fs_info *fs_info = btrfs_sb(sb);
struct btrfs_root *root = fs_info->tree_root;
struct btrfs_root *new_root;
struct btrfs_dir_item *di;
struct btrfs_path *path;
@ -530,7 +531,7 @@ static struct dentry *get_default_root(struct super_block *sb,
* will mount by default if we haven't been given a specific subvolume
* to mount.
*/
dir_id = btrfs_super_root_dir(root->fs_info->super_copy);
dir_id = btrfs_super_root_dir(fs_info->super_copy);
di = btrfs_lookup_dir_item(NULL, root, path, dir_id, "default", 7, 0);
if (IS_ERR(di)) {
btrfs_free_path(path);
@ -544,7 +545,7 @@ static struct dentry *get_default_root(struct super_block *sb,
*/
btrfs_free_path(path);
dir_id = BTRFS_FIRST_FREE_OBJECTID;
new_root = root->fs_info->fs_root;
new_root = fs_info->fs_root;
goto setup_root;
}
@ -552,7 +553,7 @@ static struct dentry *get_default_root(struct super_block *sb,
btrfs_free_path(path);
find_root:
new_root = btrfs_read_fs_root_no_name(root->fs_info, &location);
new_root = btrfs_read_fs_root_no_name(fs_info, &location);
if (IS_ERR(new_root))
return ERR_CAST(new_root);
@ -588,8 +589,7 @@ static int btrfs_fill_super(struct super_block *sb,
{
struct inode *inode;
struct dentry *root_dentry;
struct btrfs_root *tree_root = sb->s_fs_info;
struct btrfs_fs_info *fs_info = tree_root->fs_info;
struct btrfs_fs_info *fs_info = btrfs_sb(sb);
struct btrfs_key key;
int err;
@ -634,20 +634,21 @@ static int btrfs_fill_super(struct super_block *sb,
return 0;
fail_close:
close_ctree(tree_root);
close_ctree(fs_info->tree_root);
return err;
}
int btrfs_sync_fs(struct super_block *sb, int wait)
{
struct btrfs_trans_handle *trans;
struct btrfs_root *root = btrfs_sb(sb);
struct btrfs_fs_info *fs_info = btrfs_sb(sb);
struct btrfs_root *root = fs_info->tree_root;
int ret;
trace_btrfs_sync_fs(wait);
if (!wait) {
filemap_flush(root->fs_info->btree_inode->i_mapping);
filemap_flush(fs_info->btree_inode->i_mapping);
return 0;
}
@ -663,8 +664,8 @@ int btrfs_sync_fs(struct super_block *sb, int wait)
static int btrfs_show_options(struct seq_file *seq, struct dentry *dentry)
{
struct btrfs_root *root = btrfs_sb(dentry->d_sb);
struct btrfs_fs_info *info = root->fs_info;
struct btrfs_fs_info *info = btrfs_sb(dentry->d_sb);
struct btrfs_root *root = info->tree_root;
char *compress_type;
if (btrfs_test_opt(root, DEGRADED))
@ -727,10 +728,10 @@ static int btrfs_show_options(struct seq_file *seq, struct dentry *dentry)
static int btrfs_test_super(struct super_block *s, void *data)
{
struct btrfs_root *test_root = data;
struct btrfs_root *root = btrfs_sb(s);
struct btrfs_fs_info *p = data;
struct btrfs_fs_info *fs_info = btrfs_sb(s);
return root->fs_info->fs_devices == test_root->fs_info->fs_devices;
return fs_info->fs_devices == p->fs_devices;
}
static int btrfs_set_super(struct super_block *s, void *data)
@ -922,8 +923,7 @@ static struct dentry *btrfs_mount(struct file_system_type *fs_type, int flags,
}
bdev = fs_devices->latest_bdev;
s = sget(fs_type, btrfs_test_super, btrfs_set_super,
fs_info->tree_root);
s = sget(fs_type, btrfs_test_super, btrfs_set_super, fs_info);
if (IS_ERR(s)) {
error = PTR_ERR(s);
goto error_close_devices;
@ -939,7 +939,7 @@ static struct dentry *btrfs_mount(struct file_system_type *fs_type, int flags,
s->s_flags = flags | MS_NOSEC;
strlcpy(s->s_id, bdevname(bdev, b), sizeof(s->s_id));
btrfs_sb(s)->fs_info->bdev_holder = fs_type;
btrfs_sb(s)->bdev_holder = fs_type;
error = btrfs_fill_super(s, fs_devices, data,
flags & MS_SILENT ? 1 : 0);
}
@ -959,7 +959,8 @@ error_fs_info:
static int btrfs_remount(struct super_block *sb, int *flags, char *data)
{
struct btrfs_root *root = btrfs_sb(sb);
struct btrfs_fs_info *fs_info = btrfs_sb(sb);
struct btrfs_root *root = fs_info->tree_root;
int ret;
ret = btrfs_parse_options(root, data);
@ -975,13 +976,13 @@ static int btrfs_remount(struct super_block *sb, int *flags, char *data)
ret = btrfs_commit_super(root);
WARN_ON(ret);
} else {
if (root->fs_info->fs_devices->rw_devices == 0)
if (fs_info->fs_devices->rw_devices == 0)
return -EACCES;
if (btrfs_super_log_root(root->fs_info->super_copy) != 0)
if (btrfs_super_log_root(fs_info->super_copy) != 0)
return -EINVAL;
ret = btrfs_cleanup_fs_roots(root->fs_info);
ret = btrfs_cleanup_fs_roots(fs_info);
WARN_ON(ret);
/* recover relocation */
@ -1150,18 +1151,18 @@ static int btrfs_calc_avail_data_space(struct btrfs_root *root, u64 *free_bytes)
static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf)
{
struct btrfs_root *root = btrfs_sb(dentry->d_sb);
struct btrfs_super_block *disk_super = root->fs_info->super_copy;
struct list_head *head = &root->fs_info->space_info;
struct btrfs_fs_info *fs_info = btrfs_sb(dentry->d_sb);
struct btrfs_super_block *disk_super = fs_info->super_copy;
struct list_head *head = &fs_info->space_info;
struct btrfs_space_info *found;
u64 total_used = 0;
u64 total_free_data = 0;
int bits = dentry->d_sb->s_blocksize_bits;
__be32 *fsid = (__be32 *)root->fs_info->fsid;
__be32 *fsid = (__be32 *)fs_info->fsid;
int ret;
/* holding chunk_muext to avoid allocating new chunks */
mutex_lock(&root->fs_info->chunk_mutex);
mutex_lock(&fs_info->chunk_mutex);
rcu_read_lock();
list_for_each_entry_rcu(found, head, list) {
if (found->flags & BTRFS_BLOCK_GROUP_DATA) {
@ -1180,14 +1181,14 @@ static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf)
buf->f_bsize = dentry->d_sb->s_blocksize;
buf->f_type = BTRFS_SUPER_MAGIC;
buf->f_bavail = total_free_data;
ret = btrfs_calc_avail_data_space(root, &total_free_data);
ret = btrfs_calc_avail_data_space(fs_info->tree_root, &total_free_data);
if (ret) {
mutex_unlock(&root->fs_info->chunk_mutex);
mutex_unlock(&fs_info->chunk_mutex);
return ret;
}
buf->f_bavail += total_free_data;
buf->f_bavail = buf->f_bavail >> bits;
mutex_unlock(&root->fs_info->chunk_mutex);
mutex_unlock(&fs_info->chunk_mutex);
/* We treat it as constant endianness (it doesn't matter _which_)
because we want the fsid to come out the same whether mounted
@ -1203,7 +1204,7 @@ static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf)
static void btrfs_kill_super(struct super_block *sb)
{
struct btrfs_fs_info *fs_info = btrfs_sb(sb)->fs_info;
struct btrfs_fs_info *fs_info = btrfs_sb(sb);
kill_anon_super(sb);
free_fs_info(fs_info);
}
@ -1246,17 +1247,17 @@ static long btrfs_control_ioctl(struct file *file, unsigned int cmd,
static int btrfs_freeze(struct super_block *sb)
{
struct btrfs_root *root = btrfs_sb(sb);
mutex_lock(&root->fs_info->transaction_kthread_mutex);
mutex_lock(&root->fs_info->cleaner_mutex);
struct btrfs_fs_info *fs_info = btrfs_sb(sb);
mutex_lock(&fs_info->transaction_kthread_mutex);
mutex_lock(&fs_info->cleaner_mutex);
return 0;
}
static int btrfs_unfreeze(struct super_block *sb)
{
struct btrfs_root *root = btrfs_sb(sb);
mutex_unlock(&root->fs_info->cleaner_mutex);
mutex_unlock(&root->fs_info->transaction_kthread_mutex);
struct btrfs_fs_info *fs_info = btrfs_sb(sb);
mutex_unlock(&fs_info->cleaner_mutex);
mutex_unlock(&fs_info->transaction_kthread_mutex);
return 0;
}