xfs: factor out rtbitmap/summary initialization helpers

Add helpers to libxfs that can be shared by growfs and mkfs for
initializing the rtbitmap and summary, and by passing the optional data
pointer also by repair for rebuilding them.  This will become even more
useful when the rtgroups feature adds a metadata header to each block,
which means even more shared code.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
[djwong: minor documentation and data advance tweaks]
Signed-off-by: Darrick J. Wong <djwong@kernel.org>

1 files changed, 4 insertions, 117 deletions

diff --git a/fs/xfs/xfs_rtalloc.c b/fs/xfs/xfs_rtalloc.c
index 45a0d29949ea..114807cd80ba 100644
--- a/fs/xfs/xfs_rtalloc.c
+++ b/fs/xfs/xfs_rtalloc.c
@@ -641,121 +641,6 @@ xfs_rtallocate_extent_size(
 	return -ENOSPC;
 }
 
-/*
- * Allocate space to the bitmap or summary file, and zero it, for growfs.
- */
-STATIC int
-xfs_growfs_rt_alloc(
-	struct xfs_mount	*mp,		/* file system mount point */
-	xfs_extlen_t		oblocks,	/* old count of blocks */
-	xfs_extlen_t		nblocks,	/* new count of blocks */
-	struct xfs_inode	*ip)		/* inode (bitmap/summary) */
-{
-	xfs_fileoff_t		bno;		/* block number in file */
-	struct xfs_buf		*bp;	/* temporary buffer for zeroing */
-	xfs_daddr_t		d;		/* disk block address */
-	int			error;		/* error return value */
-	xfs_fsblock_t		fsbno;		/* filesystem block for bno */
-	struct xfs_bmbt_irec	map;		/* block map output */
-	int			nmap;		/* number of block maps */
-	int			resblks;	/* space reservation */
-	enum xfs_blft		buf_type;
-	struct xfs_trans	*tp;
-
-	if (ip == mp->m_rsumip)
-		buf_type = XFS_BLFT_RTSUMMARY_BUF;
-	else
-		buf_type = XFS_BLFT_RTBITMAP_BUF;
-
-	/*
-	 * Allocate space to the file, as necessary.
-	 */
-	while (oblocks < nblocks) {
-		resblks = XFS_GROWFSRT_SPACE_RES(mp, nblocks - oblocks);
-		/*
-		 * Reserve space & log for one extent added to the file.
-		 */
-		error = xfs_trans_alloc(mp, &M_RES(mp)->tr_growrtalloc, resblks,
-				0, 0, &tp);
-		if (error)
-			return error;
-		/*
-		 * Lock the inode.
-		 */
-		xfs_ilock(ip, XFS_ILOCK_EXCL);
-		xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
-
-		error = xfs_iext_count_extend(tp, ip, XFS_DATA_FORK,
-				XFS_IEXT_ADD_NOSPLIT_CNT);
-		if (error)
-			goto out_trans_cancel;
-
-		/*
-		 * Allocate blocks to the bitmap file.
-		 */
-		nmap = 1;
-		error = xfs_bmapi_write(tp, ip, oblocks, nblocks - oblocks,
-					XFS_BMAPI_METADATA, 0, &map, &nmap);
-		if (error)
-			goto out_trans_cancel;
-		/*
-		 * Free any blocks freed up in the transaction, then commit.
-		 */
-		error = xfs_trans_commit(tp);
-		if (error)
-			return error;
-		/*
-		 * Now we need to clear the allocated blocks.
-		 * Do this one block per transaction, to keep it simple.
-		 */
-		for (bno = map.br_startoff, fsbno = map.br_startblock;
-		     bno < map.br_startoff + map.br_blockcount;
-		     bno++, fsbno++) {
-			/*
-			 * Reserve log for one block zeroing.
-			 */
-			error = xfs_trans_alloc(mp, &M_RES(mp)->tr_growrtzero,
-					0, 0, 0, &tp);
-			if (error)
-				return error;
-			/*
-			 * Lock the bitmap inode.
-			 */
-			xfs_ilock(ip, XFS_ILOCK_EXCL);
-			xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
-			/*
-			 * Get a buffer for the block.
-			 */
-			d = XFS_FSB_TO_DADDR(mp, fsbno);
-			error = xfs_trans_get_buf(tp, mp->m_ddev_targp, d,
-					mp->m_bsize, 0, &bp);
-			if (error)
-				goto out_trans_cancel;
-
-			xfs_trans_buf_set_type(tp, bp, buf_type);
-			bp->b_ops = &xfs_rtbuf_ops;
-			memset(bp->b_addr, 0, mp->m_sb.sb_blocksize);
-			xfs_trans_log_buf(tp, bp, 0, mp->m_sb.sb_blocksize - 1);
-			/*
-			 * Commit the transaction.
-			 */
-			error = xfs_trans_commit(tp);
-			if (error)
-				return error;
-		}
-		/*
-		 * Go on to the next extent, if any.
-		 */
-		oblocks = map.br_startoff + map.br_blockcount;
-	}
-
-	return 0;
-
-out_trans_cancel:
-	xfs_trans_cancel(tp);
-	return error;
-}
-
 static int
 xfs_alloc_rsum_cache(
 	struct xfs_mount	*mp,
@@ -1062,10 +947,12 @@ xfs_growfs_rt(
 	/*
 	 * Allocate space to the bitmap and summary files, as necessary.
 	 */
-	error = xfs_growfs_rt_alloc(mp, rbmblocks, nrbmblocks, mp->m_rbmip);
+	error = xfs_rtfile_initialize_blocks(mp->m_rbmip, rbmblocks,
+			nrbmblocks, NULL);
 	if (error)
 		goto out_unlock;
-	error = xfs_growfs_rt_alloc(mp, rsumblocks, nrsumblocks, mp->m_rsumip);
+	error = xfs_rtfile_initialize_blocks(mp->m_rsumip, rsumblocks,
+			nrsumblocks, NULL);
 	if (error)
 		goto out_unlock;