GFS2: Fix multi-block allocation

Clean up gfs2_alloc_blocks so that it takes the full extent length
rather than just the number of non-inode blocks as an argument. That
will only make a difference in the inode allocation case for now.

Also, this fixes the extent length handling around gfs2_alloc_extent() so
that multi block allocations will work again.

The rd_last_alloc block is set to the final block in the allocated
extent (as per the update to i_goal, but referenced to a different
start point).

This also removes the dinode argument to rgblk_search() which is no
longer used.

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

1 files changed, 35 insertions, 30 deletions

diff --git a/fs/gfs2/rgrp.c b/fs/gfs2/rgrp.c
index f6e05d63e8ab..22234627f684 100644
--- a/fs/gfs2/rgrp.c
+++ b/fs/gfs2/rgrp.c
@@ -65,7 +65,7 @@ static const char valid_change[16] = {
 };
 
 static u32 rgblk_search(struct gfs2_rgrpd *rgd, u32 goal,
-                        unsigned char old_state, bool dinode,
+                        unsigned char old_state,
                         struct gfs2_bitmap **rbi);
 
 /**
@@ -939,7 +939,7 @@ static void try_rgrp_unlink(struct gfs2_rgrpd *rgd, u64 *last_unlinked, u64 skip
 
         while (goal < rgd->rd_data) {
                 down_write(&sdp->sd_log_flush_lock);
-                block = rgblk_search(rgd, goal, GFS2_BLKST_UNLINKED, 0, &bi);
+                block = rgblk_search(rgd, goal, GFS2_BLKST_UNLINKED, &bi);
                 up_write(&sdp->sd_log_flush_lock);
                 if (block == BFITNOENT)
                         break;
@@ -1147,14 +1147,14 @@ static unsigned char gfs2_get_block_type(struct gfs2_rgrpd *rgd, u64 block)
 }
 
 /**
- * rgblk_search - find a block in @old_state
+ * rgblk_search - find a block in @state
  * @rgd: the resource group descriptor
  * @goal: the goal block within the RG (start here to search for avail block)
- * @old_state: GFS2_BLKST_XXX the before-allocation state to find
+ * @state: GFS2_BLKST_XXX the before-allocation state to find
  * @dinode: TRUE if the first block we allocate is for a dinode
  * @rbi: address of the pointer to the bitmap containing the block found
  *
- * Walk rgrp's bitmap to find bits that represent a block in @old_state.
+ * Walk rgrp's bitmap to find bits that represent a block in @state.
  *
  * This function never fails, because we wouldn't call it unless we
  * know (from reservation results, etc.) that a block is available.
@@ -1166,7 +1166,7 @@ static unsigned char gfs2_get_block_type(struct gfs2_rgrpd *rgd, u64 block)
  */
 
 static u32 rgblk_search(struct gfs2_rgrpd *rgd, u32 goal,
-                        unsigned char old_state, bool dinode,
+                        unsigned char state,
                         struct gfs2_bitmap **rbi)
 {
         struct gfs2_bitmap *bi = NULL;
@@ -1198,21 +1198,21 @@ do_search:
                 bi = rgd->rd_bits + buf;
 
                 if (test_bit(GBF_FULL, &bi->bi_flags) &&
-                    (old_state == GFS2_BLKST_FREE))
+                    (state == GFS2_BLKST_FREE))
                         goto skip;
 
                 /* The GFS2_BLKST_UNLINKED state doesn't apply to the clone
                    bitmaps, so we must search the originals for that. */
                 buffer = bi->bi_bh->b_data + bi->bi_offset;
                 WARN_ON(!buffer_uptodate(bi->bi_bh));
-                if (old_state != GFS2_BLKST_UNLINKED && bi->bi_clone)
+                if (state != GFS2_BLKST_UNLINKED && bi->bi_clone)
                         buffer = bi->bi_clone + bi->bi_offset;
 
-                blk = gfs2_bitfit(buffer, bi->bi_len, goal, old_state);
+                blk = gfs2_bitfit(buffer, bi->bi_len, goal, state);
                 if (blk != BFITNOENT)
                         break;
 
-                if ((goal == 0) && (old_state == GFS2_BLKST_FREE))
+                if ((goal == 0) && (state == GFS2_BLKST_FREE))
                         set_bit(GBF_FULL, &bi->bi_flags);
 
                 /* Try next bitmap block (wrap back to rgrp header if at end) */
@@ -1247,12 +1247,12 @@ static u64 gfs2_alloc_extent(struct gfs2_rgrpd *rgd, struct gfs2_bitmap *bi,
         u32 goal;
         const u8 *buffer = NULL;
 
+        *n = 0;
         buffer = bi->bi_bh->b_data + bi->bi_offset;
         gfs2_trans_add_bh(rgd->rd_gl, bi->bi_bh, 1);
         gfs2_setbit(rgd, bi->bi_bh->b_data, bi->bi_clone, bi->bi_offset,
                     bi, blk, dinode ? GFS2_BLKST_DINODE : GFS2_BLKST_USED);
-        if (!dinode)
-                (*n)++;
+        (*n)++;
         goal = blk;
         while (*n < elen) {
                 goal++;
@@ -1266,7 +1266,7 @@ static u64 gfs2_alloc_extent(struct gfs2_rgrpd *rgd, struct gfs2_bitmap *bi,
                 (*n)++;
         }
         blk = gfs2_bi2rgd_blk(bi, blk);
-        rgd->rd_last_alloc = blk;
+        rgd->rd_last_alloc = blk + *n - 1;
         return rgd->rd_data0 + blk;
 }
 
@@ -1358,20 +1358,21 @@ static void gfs2_rgrp_error(struct gfs2_rgrpd *rgd)
  * gfs2_alloc_blocks - Allocate one or more blocks of data and/or a dinode
  * @ip: the inode to allocate the block for
  * @bn: Used to return the starting block number
- * @ndata: requested number of data blocks/extent length (value/result)
+ * @ndata: requested number of blocks/extent length (value/result)
  * @dinode: 1 if we're allocating a dinode block, else 0
  * @generation: the generation number of the inode
  *
  * Returns: 0 or error
  */
 
-int gfs2_alloc_blocks(struct gfs2_inode *ip, u64 *bn, unsigned int *ndata,
+int gfs2_alloc_blocks(struct gfs2_inode *ip, u64 *bn, unsigned int *nblocks,
                       bool dinode, u64 *generation)
 {
         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
         struct buffer_head *dibh;
         struct gfs2_rgrpd *rgd;
-        u32 goal, extlen, blk; /* block, within the rgrp scope */
+        unsigned int ndata;
+        u32 goal, blk; /* block, within the rgrp scope */
         u64 block; /* block, within the file system scope */
         int error;
         struct gfs2_bitmap *bi;
@@ -1389,17 +1390,19 @@ int gfs2_alloc_blocks(struct gfs2_inode *ip, u64 *bn, unsigned int *ndata,
         else
                 goal = rgd->rd_last_alloc;
 
-        blk = rgblk_search(rgd, goal, GFS2_BLKST_FREE, dinode, &bi);
+        blk = rgblk_search(rgd, goal, GFS2_BLKST_FREE, &bi);
 
-        *ndata = 0;
         /* Since all blocks are reserved in advance, this shouldn't happen */
         if (blk == BFITNOENT)
                 goto rgrp_error;
 
-        block = gfs2_alloc_extent(rgd, bi, blk, dinode, ndata);
+        block = gfs2_alloc_extent(rgd, bi, blk, dinode, nblocks);
+        ndata = *nblocks;
+        if (dinode)
+                ndata--;
 
         if (!dinode) {
-                ip->i_goal = block + *ndata - 1;
+                ip->i_goal = block + ndata - 1;
                 error = gfs2_meta_inode_buffer(ip, &dibh);
                 if (error == 0) {
                         struct gfs2_dinode *di =
@@ -1410,13 +1413,10 @@ int gfs2_alloc_blocks(struct gfs2_inode *ip, u64 *bn, unsigned int *ndata,
                         brelse(dibh);
                 }
         }
-        extlen = *ndata;
-        if (dinode)
-                extlen++;
-        if (rgd->rd_free < extlen)
+        if (rgd->rd_free < *nblocks)
                 goto rgrp_error;
 
-        rgd->rd_free -= extlen;
+        rgd->rd_free -= *nblocks;
         if (dinode) {
                 rgd->rd_dinodes++;
                 *generation = rgd->rd_igeneration++;
@@ -1427,15 +1427,20 @@ int gfs2_alloc_blocks(struct gfs2_inode *ip, u64 *bn, unsigned int *ndata,
         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);
 
-        gfs2_statfs_change(sdp, 0, -(s64)extlen, dinode ? 1 : 0);
+        gfs2_statfs_change(sdp, 0, -(s64)*nblocks, dinode ? 1 : 0);
         if (dinode)
                 gfs2_trans_add_unrevoke(sdp, block, 1);
-        if (*ndata)
-                gfs2_quota_change(ip, *ndata, ip->i_inode.i_uid,
+
+        /*
+         * This needs reviewing to see why we cannot do the quota change
+         * at this point in the dinode case.
+         */
+        if (ndata)
+                gfs2_quota_change(ip, ndata, ip->i_inode.i_uid,
                                   ip->i_inode.i_gid);
 
-        rgd->rd_free_clone -= extlen;
-        trace_gfs2_block_alloc(ip, block, extlen,
+        rgd->rd_free_clone -= *nblocks;
+        trace_gfs2_block_alloc(ip, block, *nblocks,
                                dinode ? GFS2_BLKST_DINODE : GFS2_BLKST_USED);
         *bn = block;
         return 0;