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ocfs2: Add CoW support.

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This patch try CoW support for a refcounted record.

the whole process will be:
1. Calculate how many clusters we need to CoW and where we start.
   Extents that are not completely encompassed by the write will
   be broken on 1MB boundaries.
2. Do CoW for the clusters with the help of page cache.
3. Change the b-tree structure with the new allocated clusters.

Signed-off-by: Tao Ma <tao.ma@oracle.com>
This commit is contained in:
Tao Ma
2009-08-25 08:05:12 +08:00
committed by Joel Becker
parent bcbbb24a6a
commit 6f70fa5199
6 changed files with 841 additions and 11 deletions
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2
fs/ocfs2/refcounttree.h
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@ -51,4 +51,6 @@ int ocfs2_prepare_refcount_change_for_del(struct inode *inode,
u32 clusters,
int *credits,
struct ocfs2_alloc_context **meta_ac);
int ocfs2_refcount_cow(struct inode *inode, struct buffer_head *di_bh,
u32 cpos, u32 write_len);
#endif /* OCFS2_REFCOUNTTREE_H */