Commit 1aa75fea authored by Tao Ma's avatar Tao Ma Committed by Joel Becker
Browse files

ocfs2: Add functions for extents refcounted. 



Add function ocfs2_mark_extent_refcounted which can mark
an extent refcounted.

Signed-off-by: default avatarTao Ma <tao.ma@oracle.com>
parent 1823cb0b

fs/ocfs2/alloc.c

+6 −6
Original line number Diff line number Diff line
@@ -5169,7 +5169,7 @@ int ocfs2_split_extent(handle_t *handle, 
 *

 * The caller is responsible for passing down meta_ac if we'll need it.

 */

static int ocfs2_change_extent_flag(handle_t *handle,

int ocfs2_change_extent_flag(handle_t *handle,

			     struct ocfs2_extent_tree *et,

			     u32 cpos, u32 len, u32 phys,

			     struct ocfs2_alloc_context *meta_ac,

fs/ocfs2/alloc.h

+6 −0
Original line number Diff line number Diff line
@@ -128,6 +128,12 @@ int ocfs2_mark_extent_written(struct inode *inode, 
			      handle_t *handle, u32 cpos, u32 len, u32 phys,

			      struct ocfs2_alloc_context *meta_ac,

			      struct ocfs2_cached_dealloc_ctxt *dealloc);

int ocfs2_change_extent_flag(handle_t *handle,

			     struct ocfs2_extent_tree *et,

			     u32 cpos, u32 len, u32 phys,

			     struct ocfs2_alloc_context *meta_ac,

			     struct ocfs2_cached_dealloc_ctxt *dealloc,

			     int new_flags, int clear_flags);

int ocfs2_remove_extent(handle_t *handle, struct ocfs2_extent_tree *et,

			u32 cpos, u32 len,

			struct ocfs2_alloc_context *meta_ac,

fs/ocfs2/ocfs2.h

+7 −0
Original line number Diff line number Diff line
@@ -516,6 +516,13 @@ static inline void ocfs2_add_links_count(struct ocfs2_dinode *di, int n) 
	ocfs2_set_links_count(di, links);

}



static inline int ocfs2_refcount_tree(struct ocfs2_super *osb)

{

	if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_REFCOUNT_TREE)

		return 1;

	return 0;

}



/* set / clear functions because cluster events can make these happen

 * in parallel so we want the transitions to be atomic. this also

 * means that any future flags osb_flags must be protected by spinlock

fs/ocfs2/refcounttree.c

+39 −0
Original line number Diff line number Diff line
@@ -2153,3 +2153,42 @@ int ocfs2_decrease_refcount(struct inode *inode, 
	brelse(ref_root_bh);

	return ret;

}



/*

 * Mark the already-existing extent at cpos as refcounted for len clusters.

 * This adds the refcount extent flag.

 *

 * If the existing extent is larger than the request, initiate a

 * split. An attempt will be made at merging with adjacent extents.

 *

 * The caller is responsible for passing down meta_ac if we'll need it.

 */

static int ocfs2_mark_extent_refcounted(struct inode *inode,

				struct ocfs2_extent_tree *et,

				handle_t *handle, u32 cpos,

				u32 len, u32 phys,

				struct ocfs2_alloc_context *meta_ac,

				struct ocfs2_cached_dealloc_ctxt *dealloc)

{

	int ret;



	mlog(0, "Inode %lu refcount tree cpos %u, len %u, phys cluster %u\n",

	     inode->i_ino, cpos, len, phys);



	if (!ocfs2_refcount_tree(OCFS2_SB(inode->i_sb))) {

		ocfs2_error(inode->i_sb, "Inode %lu want to use refcount "

			    "tree, but the feature bit is not set in the "

			    "super block.", inode->i_ino);

		ret = -EROFS;

		goto out;

	}



	ret = ocfs2_change_extent_flag(handle, et, cpos,

				       len, phys, meta_ac, dealloc,

				       OCFS2_EXT_REFCOUNTED, 0);

	if (ret)

		mlog_errno(ret);



out:

	return ret;

}