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Btrfs: Add inode flags support 

This patch adds NODATASUM & NODATACOW inode flags support.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Yan 2008-01-08 15:54:37 -05:00 committed by Chris Mason
parent c31f8830f0
commit b98b6767a0
3 changed files with 23 additions and 13 deletions
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1
fs/btrfs/btrfs_inode.h
View File

@ -34,6 +34,7 @@ struct btrfs_inode {
* transid of the trans_handle that last modified this inode
*/
u64 last_trans;
u32 flags;
};
static inline struct btrfs_inode *BTRFS_I(struct inode *inode)
{

11
fs/btrfs/ctree.h
View File

@ -447,7 +447,18 @@ struct btrfs_root {
#define btrfs_set_opt(o, opt) ((o) |= BTRFS_MOUNT_##opt)
#define btrfs_test_opt(root, opt) ((root)->fs_info->mount_opt & \
BTRFS_MOUNT_##opt)
/*
* Inode flags
*/
#define BTRFS_INODE_NODATASUM 0x1
#define BTRFS_INODE_NODATACOW 0x2
#define btrfs_clear_flag(inode, flag) (BTRFS_I(inode)->flags &= \
~BTRFS_INODE_##flag)
#define btrfs_set_flag(inode, flag) (BTRFS_I(inode)->flags |= \
BTRFS_INODE_##flag)
#define btrfs_test_flag(inode, flag) (BTRFS_I(inode)->flags & \
BTRFS_INODE_##flag)
/* some macros to generate set/get funcs for the struct fields. This
* assumes there is a lefoo_to_cpu for every type, so lets make a simple
* one for u8:

24
fs/btrfs/inode.c
View File

@ -243,9 +243,9 @@ static int run_delalloc_range(struct inode *inode, u64 start, u64 end)
struct btrfs_root *root = BTRFS_I(inode)->root;
u64 num_bytes;
int ret;
mutex_lock(&root->fs_info->fs_mutex);
if (btrfs_test_opt(root, NODATACOW))
if (btrfs_test_opt(root, NODATACOW) ||
btrfs_test_flag(inode, NODATACOW))
ret = run_delalloc_nocow(inode, start, end);
else
ret = cow_file_range(inode, start, end);
@ -273,10 +273,9 @@ int btrfs_writepage_io_hook(struct page *page, u64 start, u64 end)
int ret = 0;
u64 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
size_t offset = start - page_start;
if (btrfs_test_opt(root, NODATASUM))
if (btrfs_test_opt(root, NODATASUM) ||
btrfs_test_flag(inode, NODATASUM))
return 0;
mutex_lock(&root->fs_info->fs_mutex);
trans = btrfs_start_transaction(root, 1);
btrfs_set_trans_block_group(trans, inode);
@ -299,10 +298,9 @@ int btrfs_readpage_io_hook(struct page *page, u64 start, u64 end)
struct btrfs_csum_item *item;
struct btrfs_path *path = NULL;
u32 csum;
if (btrfs_test_opt(root, NODATASUM))
if (btrfs_test_opt(root, NODATASUM) ||
btrfs_test_flag(inode, NODATASUM))
return 0;
mutex_lock(&root->fs_info->fs_mutex);
path = btrfs_alloc_path();
item = btrfs_lookup_csum(NULL, root, path, inode->i_ino, start, 0);
@ -335,10 +333,9 @@ int btrfs_readpage_end_io_hook(struct page *page, u64 start, u64 end)
struct btrfs_root *root = BTRFS_I(inode)->root;
u32 csum = ~(u32)0;
unsigned long flags;
if (btrfs_test_opt(root, NODATASUM))
if (btrfs_test_opt(root, NODATASUM) ||
btrfs_test_flag(inode, NODATASUM))
return 0;
ret = get_state_private(em_tree, start, &private);
local_irq_save(flags);
kaddr = kmap_atomic(page, KM_IRQ0);
@ -415,7 +412,7 @@ void btrfs_read_locked_inode(struct inode *inode)
alloc_group_block = btrfs_inode_block_group(leaf, inode_item);
BTRFS_I(inode)->block_group = btrfs_lookup_block_group(root->fs_info,
alloc_group_block);
BTRFS_I(inode)->flags = btrfs_inode_flags(leaf, inode_item);
if (!BTRFS_I(inode)->block_group) {
BTRFS_I(inode)->block_group = btrfs_find_block_group(root,
NULL, 0, 0, 0);
@ -484,6 +481,7 @@ static void fill_inode_item(struct extent_buffer *leaf,
btrfs_set_inode_nblocks(leaf, item, inode->i_blocks);
btrfs_set_inode_generation(leaf, item, inode->i_generation);
btrfs_set_inode_rdev(leaf, item, inode->i_rdev);
btrfs_set_inode_flags(leaf, item, BTRFS_I(inode)->flags);
btrfs_set_inode_block_group(leaf, item,
BTRFS_I(inode)->block_group->key.objectid);
}
@ -1454,7 +1452,7 @@ static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans,
owner = 1;
group = btrfs_find_block_group(root, group, 0, 0, owner);
BTRFS_I(inode)->block_group = group;
BTRFS_I(inode)->flags = 0;
ret = btrfs_insert_empty_inode(trans, root, path, objectid);
if (ret)
goto fail;