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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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3
fs/btrfs/ordered-data.h
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@@ -132,8 +132,7 @@ int btrfs_remove_ordered_extent(struct inode *inode,
int btrfs_dec_test_ordered_pending(struct inode *inode,
u64 file_offset, u64 io_size);
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);
int btrfs_add_ordered_sum(struct inode *inode,
struct btrfs_ordered_extent *entry,
struct btrfs_ordered_sum *sum);