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Btrfs: kill free_space pointer from inode structure 

Inodes always allocate free space with BTRFS_BLOCK_GROUP_DATA type,
which means every inode has the same BTRFS_I(inode)->free_space pointer.

This shrinks struct btrfs_inode by 4 bytes (or 8 bytes on 64 bits).

Signed-off-by: Li Zefan <lizefan@huawei.com>
This commit is contained in:
Li Zefan 2012-07-09 20:21:07 -06:00 committed by Chris Mason
parent d5b025d510
commit b4d7c3c945
4 changed files with 10 additions and 19 deletions
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3
fs/btrfs/btrfs_inode.h
View File

@ -87,9 +87,6 @@ struct btrfs_inode {
/* node for the red-black tree that links inodes in subvolume root */
struct rb_node rb_node;
/* the space_info for where this inode's data allocations are done */
struct btrfs_space_info *space_info;
unsigned long runtime_flags;
/* full 64 bit generation number, struct vfs_inode doesn't have a big

3
fs/btrfs/ctree.h
View File

@ -1240,6 +1240,8 @@ struct btrfs_fs_info {
*/
struct list_head space_info;
struct btrfs_space_info *data_sinfo;
struct reloc_control *reloc_ctl;
spinlock_t delalloc_lock;
@ -2607,7 +2609,6 @@ int btrfs_remove_block_group(struct btrfs_trans_handle *trans,
struct btrfs_root *root, u64 group_start);
u64 btrfs_reduce_alloc_profile(struct btrfs_root *root, u64 flags);
u64 btrfs_get_alloc_profile(struct btrfs_root *root, int data);
void btrfs_set_inode_space_info(struct btrfs_root *root, struct inode *ionde);
void btrfs_clear_space_info_full(struct btrfs_fs_info *info);
int btrfs_check_data_free_space(struct inode *inode, u64 bytes);
void btrfs_free_reserved_data_space(struct inode *inode, u64 bytes);

20
fs/btrfs/extent-tree.c
View File

@ -3139,6 +3139,8 @@ static int update_space_info(struct btrfs_fs_info *info, u64 flags,
init_waitqueue_head(&found->wait);
*space_info = found;
list_add_rcu(&found->list, &info->space_info);
if (flags & BTRFS_BLOCK_GROUP_DATA)
info->data_sinfo = found;
return 0;
}
@ -3268,12 +3270,6 @@ u64 btrfs_get_alloc_profile(struct btrfs_root *root, int data)
return get_alloc_profile(root, flags);
}
void btrfs_set_inode_space_info(struct btrfs_root *root, struct inode *inode)
{
BTRFS_I(inode)->space_info = __find_space_info(root->fs_info,
BTRFS_BLOCK_GROUP_DATA);
}
/*
* This will check the space that the inode allocates from to make sure we have
* enough space for bytes.
@ -3282,6 +3278,7 @@ int btrfs_check_data_free_space(struct inode *inode, u64 bytes)
{
struct btrfs_space_info *data_sinfo;
struct btrfs_root *root = BTRFS_I(inode)->root;
struct btrfs_fs_info *fs_info = root->fs_info;
u64 used;
int ret = 0, committed = 0, alloc_chunk = 1;
@ -3294,7 +3291,7 @@ int btrfs_check_data_free_space(struct inode *inode, u64 bytes)
committed = 1;
}
data_sinfo = BTRFS_I(inode)->space_info;
data_sinfo = fs_info->data_sinfo;
if (!data_sinfo)
goto alloc;
@ -3335,10 +3332,9 @@ alloc:
goto commit_trans;
}
if (!data_sinfo) {
btrfs_set_inode_space_info(root, inode);
data_sinfo = BTRFS_I(inode)->space_info;
}
if (!data_sinfo)
data_sinfo = fs_info->data_sinfo;
goto again;
}
@ -3385,7 +3381,7 @@ void btrfs_free_reserved_data_space(struct inode *inode, u64 bytes)
/* make sure bytes are sectorsize aligned */
bytes = (bytes + root->sectorsize - 1) & ~((u64)root->sectorsize - 1);
data_sinfo = BTRFS_I(inode)->space_info;
data_sinfo = root->fs_info->data_sinfo;
spin_lock(&data_sinfo->lock);
data_sinfo->bytes_may_use -= bytes;
trace_btrfs_space_reservation(root->fs_info, "space_info",

3
fs/btrfs/inode.c
View File

@ -4082,7 +4082,6 @@ static int btrfs_init_locked_inode(struct inode *inode, void *p)
struct btrfs_iget_args *args = p;
inode->i_ino = args->ino;
BTRFS_I(inode)->root = args->root;
btrfs_set_inode_space_info(args->root, inode);
return 0;
}
@ -4667,7 +4666,6 @@ static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans,
BTRFS_I(inode)->root = root;
BTRFS_I(inode)->generation = trans->transid;
inode->i_generation = BTRFS_I(inode)->generation;
btrfs_set_inode_space_info(root, inode);
if (S_ISDIR(mode))
owner = 0;
@ -6944,7 +6942,6 @@ struct inode *btrfs_alloc_inode(struct super_block *sb)
return NULL;
ei->root = NULL;
ei->space_info = NULL;
ei->generation = 0;
ei->last_trans = 0;
ei->last_sub_trans = 0;