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Re: [Cluster-devel] [GFS2 PATCH] GFS2: combine gfs2_alloc_block and gfs2_alloc_di



----- Original Message -----
| Hi,
| 
| As a follow up to this patch, I'd quite like to see rgblk_search
| split
| into two functions. One to do the search and another to actually make
| changes to the bitmap when a block is found. That should help
| development of further alloc changes on top.
| 
| Also, if someone requests allocation of an extent > 1 block with an
| inode type, then only the first block should be set to being an
| inode,
| the others should be set to "used" and the various stats should be
| updated accordingly. Otherwise it will never be possible to ask for
| more
| than a single block when an inode is being allocated,
| 
| Steve.

Hi,

Good suggestions. Hopefully I'll post a patch or two soon.
In the meantime, here's a clean-up for one of the patches.
I should have done this in the first place.

Regards,

Bob Peterson
Red Hat File Systems
--
commit e5091d2b20b98424cb6924ec499bdf5c5bc5827d
Author: Bob Peterson <rpeterso redhat com>
Date:   Wed Nov 16 08:17:33 2011 -0600

    GFS2: Clean up gfs2_block_alloc by passing in block type
    
    This patch simplifies function gfs2_block_alloc by making its
    callers pass in the requested block type rather than a flag to be
    translated as a block type.

diff --git a/fs/gfs2/bmap.c b/fs/gfs2/bmap.c
index b69235b..491e1f2 100644
--- a/fs/gfs2/bmap.c
+++ b/fs/gfs2/bmap.c
@@ -133,7 +133,7 @@ int gfs2_unstuff_dinode(struct gfs2_inode *ip, struct page *page)
 		   and write it out to disk */
 
 		unsigned int n = 1;
-		error = gfs2_alloc_block(ip, &block, &n, 0, NULL);
+		error = gfs2_alloc_block(ip, &block, &n, GFS2_BLKST_USED, NULL);
 		if (error)
 			goto out_brelse;
 		if (isdir) {
@@ -503,7 +503,7 @@ static int gfs2_bmap_alloc(struct inode *inode, const sector_t lblock,
 	do {
 		int error;
 		n = blks - alloced;
-		error = gfs2_alloc_block(ip, &bn, &n, 0, NULL);
+		error = gfs2_alloc_block(ip, &bn, &n, GFS2_BLKST_USED, NULL);
 		if (error)
 			return error;
 		alloced += n;
diff --git a/fs/gfs2/dir.c b/fs/gfs2/dir.c
index ae75319..c38b32c 100644
--- a/fs/gfs2/dir.c
+++ b/fs/gfs2/dir.c
@@ -823,7 +823,7 @@ static struct gfs2_leaf *new_leaf(struct inode *inode, struct buffer_head **pbh,
 	struct gfs2_dirent *dent;
 	struct qstr name = { .name = "", .len = 0, .hash = 0 };
 
-	error = gfs2_alloc_block(ip, &bn, &n, 0, NULL);
+	error = gfs2_alloc_block(ip, &bn, &n, GFS2_BLKST_USED, NULL);
 	if (error)
 		return NULL;
 	bh = gfs2_meta_new(ip->i_gl, bn);
diff --git a/fs/gfs2/inode.c b/fs/gfs2/inode.c
index de2668f..25b6657 100644
--- a/fs/gfs2/inode.c
+++ b/fs/gfs2/inode.c
@@ -402,7 +402,8 @@ static int alloc_dinode(struct gfs2_inode *dip, u64 *no_addr, u64 *generation)
 	if (error)
 		goto out_ipreserv;
 
-	error = gfs2_alloc_block(dip, no_addr, NULL, 1, generation);
+	error = gfs2_alloc_block(dip, no_addr, NULL, GFS2_BLKST_DINODE,
+				 generation);
 
 	gfs2_trans_end(sdp);
 
diff --git a/fs/gfs2/rgrp.c b/fs/gfs2/rgrp.c
index 995f4e6..abac4bd 100644
--- a/fs/gfs2/rgrp.c
+++ b/fs/gfs2/rgrp.c
@@ -1311,7 +1311,7 @@ static void gfs2_rgrp_error(struct gfs2_rgrpd *rgd)
  */
 
 int gfs2_alloc_block(struct gfs2_inode *ip, u64 *bn, unsigned int *n,
-		     int dinode, u64 *generation)
+		     unsigned char blk_type, u64 *generation)
 {
 	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 	struct buffer_head *dibh;
@@ -1321,7 +1321,6 @@ int gfs2_alloc_block(struct gfs2_inode *ip, u64 *bn, unsigned int *n,
 	u64 block; /* block, within the file system scope */
 	unsigned int extn = 1;
 	int error;
-	unsigned char blk_type = dinode ? GFS2_BLKST_DINODE : GFS2_BLKST_USED;
 
 	/* Only happens if there is a bug in gfs2, return something distinctive
 	 * to ensure that it is noticed.
@@ -1333,7 +1332,7 @@ int gfs2_alloc_block(struct gfs2_inode *ip, u64 *bn, unsigned int *n,
 		n = &extn;
 	rgd = ip->i_rgd;
 
-	if (!dinode && rgrp_contains_block(rgd, ip->i_goal))
+	if (blk_type == GFS2_BLKST_USED && rgrp_contains_block(rgd, ip->i_goal))
 		goal = ip->i_goal - rgd->rd_data0;
 	else
 		goal = rgd->rd_last_alloc;
@@ -1346,7 +1345,7 @@ int gfs2_alloc_block(struct gfs2_inode *ip, u64 *bn, unsigned int *n,
 
 	rgd->rd_last_alloc = blk;
 	block = rgd->rd_data0 + blk;
-	if (!dinode) {
+	if (blk_type == GFS2_BLKST_USED) {
 		ip->i_goal = block + *n - 1;
 		error = gfs2_meta_inode_buffer(ip, &dibh);
 		if (error == 0) {
@@ -1362,7 +1361,7 @@ int gfs2_alloc_block(struct gfs2_inode *ip, u64 *bn, unsigned int *n,
 		goto rgrp_error;
 
 	rgd->rd_free -= *n;
-	if (dinode) {
+	if (blk_type == GFS2_BLKST_DINODE) {
 		rgd->rd_dinodes++;
 		*generation = rgd->rd_igeneration++;
 		if (*generation == 0)
@@ -1374,8 +1373,8 @@ int gfs2_alloc_block(struct gfs2_inode *ip, u64 *bn, unsigned int *n,
 
 	al->al_alloced += *n;
 
-	gfs2_statfs_change(sdp, 0, -(s64)*n, dinode ? 1 : 0);
-	if (dinode)
+	gfs2_statfs_change(sdp, 0, -(s64)*n, (blk_type == GFS2_BLKST_DINODE));
+	if (blk_type == GFS2_BLKST_DINODE)
 		gfs2_trans_add_unrevoke(sdp, block, 1);
 	else
 		gfs2_quota_change(ip, *n, ip->i_inode.i_uid,
diff --git a/fs/gfs2/rgrp.h b/fs/gfs2/rgrp.h
index 4cb5608..6a81011 100644
--- a/fs/gfs2/rgrp.h
+++ b/fs/gfs2/rgrp.h
@@ -40,7 +40,7 @@ extern int gfs2_inplace_reserve(struct gfs2_inode *ip);
 extern void gfs2_inplace_release(struct gfs2_inode *ip);
 
 extern int gfs2_alloc_block(struct gfs2_inode *ip, u64 *bn, unsigned int *n,
-			    int dinode, u64 *generation);
+			    unsigned char blk_type, u64 *generation);
 
 extern void __gfs2_free_blocks(struct gfs2_inode *ip, u64 bstart, u32 blen, int meta);
 extern void gfs2_free_meta(struct gfs2_inode *ip, u64 bstart, u32 blen);
diff --git a/fs/gfs2/xattr.c b/fs/gfs2/xattr.c
index e4794a5..f2b77b4 100644
--- a/fs/gfs2/xattr.c
+++ b/fs/gfs2/xattr.c
@@ -610,7 +610,7 @@ static int ea_alloc_blk(struct gfs2_inode *ip, struct buffer_head **bhp)
 	u64 block;
 	int error;
 
-	error = gfs2_alloc_block(ip, &block, &n, 0, NULL);
+	error = gfs2_alloc_block(ip, &block, &n, GFS2_BLKST_USED, NULL);
 	if (error)
 		return error;
 	gfs2_trans_add_unrevoke(sdp, block, 1);
@@ -672,7 +672,8 @@ static int ea_write(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
 			int mh_size = sizeof(struct gfs2_meta_header);
 			unsigned int n = 1;
 
-			error = gfs2_alloc_block(ip, &block, &n, 0, NULL);
+			error = gfs2_alloc_block(ip, &block, &n,
+						 GFS2_BLKST_USED, NULL);
 			if (error)
 				return error;
 			gfs2_trans_add_unrevoke(sdp, block, 1);
@@ -992,7 +993,7 @@ static int ea_set_block(struct gfs2_inode *ip, struct gfs2_ea_request *er,
 	} else {
 		u64 blk;
 		unsigned int n = 1;
-		error = gfs2_alloc_block(ip, &blk, &n, 0, NULL);
+		error = gfs2_alloc_block(ip, &blk, &n, GFS2_BLKST_USED, NULL);
 		if (error)
 			return error;
 		gfs2_trans_add_unrevoke(sdp, blk, 1);


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