Commit e7d4cb6b authored by Tao Ma's avatar Tao Ma Committed by Mark Fasheh
Browse files

ocfs2: Abstract ocfs2_extent_tree in b-tree operations. 



In the old extent tree operation, we take the hypothesis that we
are using the ocfs2_extent_list in ocfs2_dinode as the tree root.
As xattr will also use ocfs2_extent_list to store large value
for a xattr entry, we refactor the tree operation so that xattr
can use it directly.

The refactoring includes 4 steps:
1. Abstract set/get of last_eb_blk and update_clusters since they may
   be stored in different location for dinode and xattr.
2. Add a new structure named ocfs2_extent_tree to indicate the
   extent tree the operation will work on.
3. Remove all the use of fe_bh and di, use root_bh and root_el in
   extent tree instead. So now all the fe_bh is replaced with
   et->root_bh, el with root_el accordingly.
4. Make ocfs2_lock_allocators generic. Now it is limited to be only used
   in file extend allocation. But the whole function is useful when we want
   to store large EAs.

Note: This patch doesn't touch ocfs2_commit_truncate() since it is not used
for anything other than truncate inode data btrees.

Signed-off-by: default avatarTao Ma <tao.ma@oracle.com>
Signed-off-by: default avatarMark Fasheh <mfasheh@suse.com>
parent 811f933d

fs/ocfs2/alloc.c

+327 −181

File changed.

Preview size limit exceeded, changes collapsed.

fs/ocfs2/alloc.h

+16 −7
Original line number Diff line number Diff line
@@ -26,28 +26,37 @@ 
#ifndef OCFS2_ALLOC_H

#define OCFS2_ALLOC_H



enum ocfs2_extent_tree_type {

	OCFS2_DINODE_EXTENT = 0,

};



struct ocfs2_alloc_context;

int ocfs2_insert_extent(struct ocfs2_super *osb,

			handle_t *handle,

			struct inode *inode,

			struct buffer_head *fe_bh,

			struct buffer_head *root_bh,

			u32 cpos,

			u64 start_blk,

			u32 new_clusters,

			u8 flags,

			struct ocfs2_alloc_context *meta_ac);

			struct ocfs2_alloc_context *meta_ac,

			enum ocfs2_extent_tree_type et_type);

struct ocfs2_cached_dealloc_ctxt;

int ocfs2_mark_extent_written(struct inode *inode, struct buffer_head *di_bh,

int ocfs2_mark_extent_written(struct inode *inode, struct buffer_head *root_bh,

			      handle_t *handle, u32 cpos, u32 len, u32 phys,

			      struct ocfs2_alloc_context *meta_ac,

			      struct ocfs2_cached_dealloc_ctxt *dealloc);

int ocfs2_remove_extent(struct inode *inode, struct buffer_head *di_bh,

			      struct ocfs2_cached_dealloc_ctxt *dealloc,

			      enum ocfs2_extent_tree_type et_type);

int ocfs2_remove_extent(struct inode *inode, struct buffer_head *root_bh,

			u32 cpos, u32 len, handle_t *handle,

			struct ocfs2_alloc_context *meta_ac,

			struct ocfs2_cached_dealloc_ctxt *dealloc);

			struct ocfs2_cached_dealloc_ctxt *dealloc,

			enum ocfs2_extent_tree_type et_type);

int ocfs2_num_free_extents(struct ocfs2_super *osb,

			   struct inode *inode,

			   struct buffer_head *bh);

			   struct buffer_head *root_bh,

			   enum ocfs2_extent_tree_type et_type);



/*

 * how many new metadata chunks would an allocation need at maximum?

 *

fs/ocfs2/aops.c

+9 −2
Original line number Diff line number Diff line
@@ -1278,7 +1278,8 @@ static int ocfs2_write_cluster(struct address_space *mapping, 
	} else if (unwritten) {

		ret = ocfs2_mark_extent_written(inode, wc->w_di_bh,

						wc->w_handle, cpos, 1, phys,

						meta_ac, &wc->w_dealloc);

						meta_ac, &wc->w_dealloc,

						OCFS2_DINODE_EXTENT);

		if (ret < 0) {

			mlog_errno(ret);

			goto out;
@@ -1712,7 +1713,13 @@ int ocfs2_write_begin_nolock(struct address_space *mapping, 
		 * ocfs2_lock_allocators(). It greatly over-estimates

		 * the work to be done.

		 */

		ret = ocfs2_lock_allocators(inode, wc->w_di_bh,

		mlog(0, "extend inode %llu, i_size = %lld, di->i_clusters = %u,"

		     " clusters_to_add = %u, extents_to_split = %u\n",

		     (unsigned long long)OCFS2_I(inode)->ip_blkno,

		     (long long)i_size_read(inode), le32_to_cpu(di->i_clusters),

		     clusters_to_alloc, extents_to_split);



		ret = ocfs2_lock_allocators(inode, wc->w_di_bh, &di->id2.i_list,

					    clusters_to_alloc, extents_to_split,

					    &data_ac, &meta_ac);

		if (ret) {

fs/ocfs2/dir.c

+4 −3
Original line number Diff line number Diff line
@@ -1306,7 +1306,7 @@ static int ocfs2_expand_inline_dir(struct inode *dir, struct buffer_head *di_bh, 
	 * related blocks have been journaled already.

	 */

	ret = ocfs2_insert_extent(osb, handle, dir, di_bh, 0, blkno, len, 0,

				  NULL);

				  NULL, OCFS2_DINODE_EXTENT);

	if (ret) {

		mlog_errno(ret);

		goto out_commit;
@@ -1338,7 +1338,7 @@ static int ocfs2_expand_inline_dir(struct inode *dir, struct buffer_head *di_bh, 
		blkno = ocfs2_clusters_to_blocks(dir->i_sb, bit_off);



		ret = ocfs2_insert_extent(osb, handle, dir, di_bh, 1, blkno,

					  len, 0, NULL);

					  len, 0, NULL, OCFS2_DINODE_EXTENT);

		if (ret) {

			mlog_errno(ret);

			goto out_commit;
@@ -1481,7 +1481,8 @@ static int ocfs2_extend_dir(struct ocfs2_super *osb, 
	if (dir_i_size == ocfs2_clusters_to_bytes(sb, OCFS2_I(dir)->ip_clusters)) {

		spin_unlock(&OCFS2_I(dir)->ip_lock);

		num_free_extents = ocfs2_num_free_extents(osb, dir,

							  parent_fe_bh);

							  parent_fe_bh,

							  OCFS2_DINODE_EXTENT);

		if (num_free_extents < 0) {

			status = num_free_extents;

			mlog_errno(status);

fs/ocfs2/file.c

+13 −91
Original line number Diff line number Diff line
@@ -521,7 +521,8 @@ int ocfs2_do_extend_allocation(struct ocfs2_super *osb, 
	if (mark_unwritten)

		flags = OCFS2_EXT_UNWRITTEN;



	free_extents = ocfs2_num_free_extents(osb, inode, fe_bh);

	free_extents = ocfs2_num_free_extents(osb, inode, fe_bh,

					      OCFS2_DINODE_EXTENT);

	if (free_extents < 0) {

		status = free_extents;

		mlog_errno(status);
@@ -570,7 +571,7 @@ int ocfs2_do_extend_allocation(struct ocfs2_super *osb, 
	     num_bits, bit_off, (unsigned long long)OCFS2_I(inode)->ip_blkno);

	status = ocfs2_insert_extent(osb, handle, inode, fe_bh,

				     *logical_offset, block, num_bits,

				     flags, meta_ac);

				     flags, meta_ac, OCFS2_DINODE_EXTENT);

	if (status < 0) {

		mlog_errno(status);

		goto leave;
@@ -599,92 +600,6 @@ leave: 
	return status;

}



/*

 * For a given allocation, determine which allocators will need to be

 * accessed, and lock them, reserving the appropriate number of bits.

 *

 * Sparse file systems call this from ocfs2_write_begin_nolock()

 * and ocfs2_allocate_unwritten_extents().

 *

 * File systems which don't support holes call this from

 * ocfs2_extend_allocation().

 */

int ocfs2_lock_allocators(struct inode *inode, struct buffer_head *di_bh,

			  u32 clusters_to_add, u32 extents_to_split,

			  struct ocfs2_alloc_context **data_ac,

			  struct ocfs2_alloc_context **meta_ac)

{

	int ret = 0, num_free_extents;

	unsigned int max_recs_needed = clusters_to_add + 2 * extents_to_split;

	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);

	struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;



	*meta_ac = NULL;

	if (data_ac)

		*data_ac = NULL;



	BUG_ON(clusters_to_add != 0 && data_ac == NULL);



	mlog(0, "extend inode %llu, i_size = %lld, di->i_clusters = %u, "

	     "clusters_to_add = %u, extents_to_split = %u\n",

	     (unsigned long long)OCFS2_I(inode)->ip_blkno, (long long)i_size_read(inode),

	     le32_to_cpu(di->i_clusters), clusters_to_add, extents_to_split);



	num_free_extents = ocfs2_num_free_extents(osb, inode, di_bh);

	if (num_free_extents < 0) {

		ret = num_free_extents;

		mlog_errno(ret);

		goto out;

	}



	/*

	 * Sparse allocation file systems need to be more conservative

	 * with reserving room for expansion - the actual allocation

	 * happens while we've got a journal handle open so re-taking

	 * a cluster lock (because we ran out of room for another

	 * extent) will violate ordering rules.

	 *

	 * Most of the time we'll only be seeing this 1 cluster at a time

	 * anyway.

	 *

	 * Always lock for any unwritten extents - we might want to

	 * add blocks during a split.

	 */

	if (!num_free_extents ||

	    (ocfs2_sparse_alloc(osb) && num_free_extents < max_recs_needed)) {

		ret = ocfs2_reserve_new_metadata(osb, &di->id2.i_list, meta_ac);

		if (ret < 0) {

			if (ret != -ENOSPC)

				mlog_errno(ret);

			goto out;

		}

	}



	if (clusters_to_add == 0)

		goto out;



	ret = ocfs2_reserve_clusters(osb, clusters_to_add, data_ac);

	if (ret < 0) {

		if (ret != -ENOSPC)

			mlog_errno(ret);

		goto out;

	}



out:

	if (ret) {

		if (*meta_ac) {

			ocfs2_free_alloc_context(*meta_ac);

			*meta_ac = NULL;

		}



		/*

		 * We cannot have an error and a non null *data_ac.

		 */

	}



	return ret;

}



static int __ocfs2_extend_allocation(struct inode *inode, u32 logical_start,

				     u32 clusters_to_add, int mark_unwritten)

{
@@ -725,7 +640,13 @@ static int __ocfs2_extend_allocation(struct inode *inode, u32 logical_start, 
restart_all:

	BUG_ON(le32_to_cpu(fe->i_clusters) != OCFS2_I(inode)->ip_clusters);



	status = ocfs2_lock_allocators(inode, bh, clusters_to_add, 0, &data_ac,

	mlog(0, "extend inode %llu, i_size = %lld, di->i_clusters = %u, "

	     "clusters_to_add = %u\n",

	     (unsigned long long)OCFS2_I(inode)->ip_blkno,

	     (long long)i_size_read(inode), le32_to_cpu(fe->i_clusters),

	     clusters_to_add);

	status = ocfs2_lock_allocators(inode, bh, &fe->id2.i_list,

				       clusters_to_add, 0, &data_ac,

				       &meta_ac);

	if (status) {

		mlog_errno(status);
@@ -1397,7 +1318,8 @@ static int __ocfs2_remove_inode_range(struct inode *inode, 
	struct ocfs2_alloc_context *meta_ac = NULL;

	struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;



	ret = ocfs2_lock_allocators(inode, di_bh, 0, 1, NULL, &meta_ac);

	ret = ocfs2_lock_allocators(inode, di_bh, &di->id2.i_list,

				    0, 1, NULL, &meta_ac);

	if (ret) {

		mlog_errno(ret);

		return ret;
@@ -1428,7 +1350,7 @@ static int __ocfs2_remove_inode_range(struct inode *inode, 
	}



	ret = ocfs2_remove_extent(inode, di_bh, cpos, len, handle, meta_ac,

				  dealloc);

				  dealloc, OCFS2_DINODE_EXTENT);

	if (ret) {

		mlog_errno(ret);

		goto out_commit;

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