GFS2: combine gfs2_alloc_block and gfs2_alloc_di

GFS2 functions gfs2_alloc_block and gfs2_alloc_di do basically
the same things, with a few exceptions. This patch combines
the two functions into a slightly more generic gfs2_alloc_block.
Having one centralized block allocation function will reduce
code redundancy and make it easier to implement multi-block
reservations to reduce file fragmentation in the future.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

1 files changed, 36 insertions, 68 deletions

diff --git a/fs/gfs2/rgrp.c b/fs/gfs2/rgrp.c
index a1a815b691cd..995f4e674489 100644
--- a/fs/gfs2/rgrp.c
+++ b/fs/gfs2/rgrp.c
@@ -1304,19 +1304,24 @@ static void gfs2_rgrp_error(struct gfs2_rgrpd *rgd)
  * @ip: the inode to allocate the block for
  * @bn: Used to return the starting block number
  * @n: requested number of blocks/extent length (value/result)
+ * dinode: 1 if we're allocating a dinode, 0 if it's a data block
+ * @generation: the generation number of the inode
  *
  * Returns: 0 or error
  */
 
-int gfs2_alloc_block(struct gfs2_inode *ip, u64 *bn, unsigned int *n)
+int gfs2_alloc_block(struct gfs2_inode *ip, u64 *bn, unsigned int *n,
+                     int dinode, u64 *generation)
 {
         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
         struct buffer_head *dibh;
         struct gfs2_alloc *al = ip->i_alloc;
         struct gfs2_rgrpd *rgd;
-        u32 goal, blk;
-        u64 block;
+        u32 goal, blk; /* block, within the rgrp scope */
+        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.
@@ -1324,14 +1329,16 @@ int gfs2_alloc_block(struct gfs2_inode *ip, u64 *bn, unsigned int *n)
         if (al == NULL)
                 return -ECANCELED;
 
+        if (n == NULL)
+                n = &extn;
         rgd = ip->i_rgd;
 
-        if (rgrp_contains_block(rgd, ip->i_goal))
+        if (!dinode && rgrp_contains_block(rgd, ip->i_goal))
                 goal = ip->i_goal - rgd->rd_data0;
         else
                 goal = rgd->rd_last_alloc;
 
-        blk = rgblk_search(rgd, goal, GFS2_BLKST_FREE, GFS2_BLKST_USED, n);
+        blk = rgblk_search(rgd, goal, GFS2_BLKST_FREE, blk_type, n);
 
         /* Since all blocks are reserved in advance, this shouldn't happen */
         if (blk == BFITNOENT)
@@ -1339,82 +1346,43 @@ int gfs2_alloc_block(struct gfs2_inode *ip, u64 *bn, unsigned int *n)
 
         rgd->rd_last_alloc = blk;
         block = rgd->rd_data0 + blk;
-        ip->i_goal = block + *n - 1;
-        error = gfs2_meta_inode_buffer(ip, &dibh);
-        if (error == 0) {
-                struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
-                gfs2_trans_add_bh(ip->i_gl, dibh, 1);
-                di->di_goal_meta = di->di_goal_data = cpu_to_be64(ip->i_goal);
-                brelse(dibh);
+        if (!dinode) {
+                ip->i_goal = block + *n - 1;
+                error = gfs2_meta_inode_buffer(ip, &dibh);
+                if (error == 0) {
+                        struct gfs2_dinode *di =
+                                (struct gfs2_dinode *)dibh->b_data;
+                        gfs2_trans_add_bh(ip->i_gl, dibh, 1);
+                        di->di_goal_meta = di->di_goal_data =
+                                cpu_to_be64(ip->i_goal);
+                        brelse(dibh);
+                }
         }
         if (rgd->rd_free < *n)
                 goto rgrp_error;
 
         rgd->rd_free -= *n;
+        if (dinode) {
+                rgd->rd_dinodes++;
+                *generation = rgd->rd_igeneration++;
+                if (*generation == 0)
+                        *generation = rgd->rd_igeneration++;
+        }
 
         gfs2_trans_add_bh(rgd->rd_gl, rgd->rd_bits[0].bi_bh, 1);
         gfs2_rgrp_out(rgd, rgd->rd_bits[0].bi_bh->b_data);
 
         al->al_alloced += *n;
 
-        gfs2_statfs_change(sdp, 0, -(s64)*n, 0);
-        gfs2_quota_change(ip, *n, ip->i_inode.i_uid, ip->i_inode.i_gid);
+        gfs2_statfs_change(sdp, 0, -(s64)*n, dinode ? 1 : 0);
+        if (dinode)
+                gfs2_trans_add_unrevoke(sdp, block, 1);
+        else
+                gfs2_quota_change(ip, *n, ip->i_inode.i_uid,
+                                  ip->i_inode.i_gid);
 
         rgd->rd_free_clone -= *n;
-        trace_gfs2_block_alloc(ip, block, *n, GFS2_BLKST_USED);
-        *bn = block;
-        return 0;
-
-rgrp_error:
-        gfs2_rgrp_error(rgd);
-        return -EIO;
-}
-
-/**
- * gfs2_alloc_di - Allocate a dinode
- * @dip: the directory that the inode is going in
- * @bn: the block number which is allocated
- * @generation: the generation number of the inode
- *
- * Returns: 0 on success or error
- */
-
-int gfs2_alloc_di(struct gfs2_inode *dip, u64 *bn, u64 *generation)
-{
-        struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
-        struct gfs2_alloc *al = dip->i_alloc;
-        struct gfs2_rgrpd *rgd = dip->i_rgd;
-        u32 blk;
-        u64 block;
-        unsigned int n = 1;
-
-        blk = rgblk_search(rgd, rgd->rd_last_alloc,
-                           GFS2_BLKST_FREE, GFS2_BLKST_DINODE, &n);
-
-        /* Since all blocks are reserved in advance, this shouldn't happen */
-        if (blk == BFITNOENT)
-                goto rgrp_error;
-
-        rgd->rd_last_alloc = blk;
-        block = rgd->rd_data0 + blk;
-        if (rgd->rd_free == 0)
-                goto rgrp_error;
-
-        rgd->rd_free--;
-        rgd->rd_dinodes++;
-        *generation = rgd->rd_igeneration++;
-        if (*generation == 0)
-                *generation = rgd->rd_igeneration++;
-        gfs2_trans_add_bh(rgd->rd_gl, rgd->rd_bits[0].bi_bh, 1);
-        gfs2_rgrp_out(rgd, rgd->rd_bits[0].bi_bh->b_data);
-
-        al->al_alloced++;
-
-        gfs2_statfs_change(sdp, 0, -1, +1);
-        gfs2_trans_add_unrevoke(sdp, block, 1);
-
-        rgd->rd_free_clone--;
-        trace_gfs2_block_alloc(dip, block, 1, GFS2_BLKST_DINODE);
+        trace_gfs2_block_alloc(ip, block, *n, blk_type);
         *bn = block;
         return 0;