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authorTristan Ye <tristan.ye@oracle.com>2010-05-11 13:54:42 +0400
committerJoel Becker <joel.becker@oracle.com>2010-05-18 23:25:10 +0400
commit78f94673d7faf01677f374f4ebbf324ff1a0aa6e (patch)
tree1bd394469f12b5e148835365295d1df413c04a0c /fs/ocfs2/alloc.h
parent547ba7c8efe43c2cabb38782e23572a6179dd1c1 (diff)
downloadlinux-78f94673d7faf01677f374f4ebbf324ff1a0aa6e.tar.xz
Ocfs2: Optimize ocfs2 truncate to use ocfs2_remove_btree_range() instead.
Truncate is just a special case of punching holes(from new i_size to end), we therefore could take advantage of the existing ocfs2_remove_btree_range() to reduce the comlexity and redundancy in alloc.c. The goal here is to make truncate more generic and straightforward. Several functions only used by ocfs2_commit_truncate() will smiply be removed. ocfs2_remove_btree_range() was originally used by the hole punching code, which didn't take refcount trees into account (definitely a bug). We therefore need to change that func a bit to handle refcount trees. It must take the refcount lock, calculate and reserve blocks for refcount tree changes, and decrease refcounts at the end. We replace ocfs2_lock_allocators() here by adding a new func ocfs2_reserve_blocks_for_rec_trunc() which accepts some extra blocks to reserve. This will not hurt any other code using ocfs2_remove_btree_range() (such as dir truncate and hole punching). I merged the following steps into one patch since they may be logically doing one thing, though I know it looks a little bit fat to review. 1). Remove redundant code used by ocfs2_commit_truncate(), since we're moving to ocfs2_remove_btree_range anyway. 2). Add a new func ocfs2_reserve_blocks_for_rec_trunc() for purpose of accepting some extra blocks to reserve. 3). Change ocfs2_prepare_refcount_change_for_del() a bit to fit our needs. It's safe to do this since it's only being called by truncate. 4). Change ocfs2_remove_btree_range() a bit to take refcount case into account. 5). Finally, we change ocfs2_commit_truncate() to call ocfs2_remove_btree_range() in a proper way. The patch has been tested normally for sanity check, stress tests with heavier workload will be expected. Based on this patch, fixing the punching holes bug will be fairly easy. Signed-off-by: Tristan Ye <tristan.ye@oracle.com> Acked-by: Mark Fasheh <mfasheh@suse.com> Signed-off-by: Joel Becker <joel.becker@oracle.com>
Diffstat (limited to 'fs/ocfs2/alloc.h')
-rw-r--r--fs/ocfs2/alloc.h8
1 files changed, 4 insertions, 4 deletions
diff --git a/fs/ocfs2/alloc.h b/fs/ocfs2/alloc.h
index 1db4359ccb90..4fb9882ed2d6 100644
--- a/fs/ocfs2/alloc.h
+++ b/fs/ocfs2/alloc.h
@@ -140,8 +140,9 @@ int ocfs2_remove_extent(handle_t *handle, struct ocfs2_extent_tree *et,
struct ocfs2_cached_dealloc_ctxt *dealloc);
int ocfs2_remove_btree_range(struct inode *inode,
struct ocfs2_extent_tree *et,
- u32 cpos, u32 phys_cpos, u32 len,
- struct ocfs2_cached_dealloc_ctxt *dealloc);
+ u32 cpos, u32 phys_cpos, u32 len, int flags,
+ struct ocfs2_cached_dealloc_ctxt *dealloc,
+ u64 refcount_loc);
int ocfs2_num_free_extents(struct ocfs2_super *osb,
struct ocfs2_extent_tree *et);
@@ -233,8 +234,7 @@ int ocfs2_prepare_truncate(struct ocfs2_super *osb,
struct ocfs2_truncate_context **tc);
int ocfs2_commit_truncate(struct ocfs2_super *osb,
struct inode *inode,
- struct buffer_head *fe_bh,
- struct ocfs2_truncate_context *tc);
+ struct buffer_head *di_bh);
int ocfs2_truncate_inline(struct inode *inode, struct buffer_head *di_bh,
unsigned int start, unsigned int end, int trunc);