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Btrfs: update nodatacow code v2

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This patch simplifies the nodatacow checker. If all references
were created after the latest snapshot, then we can avoid COW
safely. This patch also updates run_delalloc_nocow to do more
fine-grained checking.

Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
This commit is contained in:
Yan Zheng 2008-10-30 14:20:02 -04:00 • committed by Chris Mason
parent 6643558db2
commit 80ff385665
7 changed files with 154 additions and 213 deletions
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9
fs/btrfs/ordered-data.c
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@ -165,8 +165,7 @@ static inline struct rb_node *tree_search(struct btrfs_ordered_inode_tree *tree,
* inserted.
*/
int btrfs_add_ordered_extent(struct inode *inode, u64 file_offset,
u64 start, u64 len, u64 disk_len, int nocow,
int compressed)
u64 start, u64 len, u64 disk_len, int type)
{
struct btrfs_ordered_inode_tree *tree;
struct rb_node *node;
@ -183,10 +182,8 @@ int btrfs_add_ordered_extent(struct inode *inode, u64 file_offset,
entry->len = len;
entry->disk_len = disk_len;
entry->inode = inode;
if (nocow)
set_bit(BTRFS_ORDERED_NOCOW, &entry->flags);
if (compressed)
set_bit(BTRFS_ORDERED_COMPRESSED, &entry->flags);
if (type == BTRFS_ORDERED_NOCOW || type == BTRFS_ORDERED_COMPRESSED)
set_bit(type, &entry->flags);
/* one ref for the tree */
atomic_set(&entry->refs, 1);