[GFS2] gfs2_adjust_quota has broken unstuffing code

This patch combines the 2 patches in bug 434736 to correct the lock
ordering in the unstuffing of the quota inode in gfs2_adjust_quota and
adjusting the number of revokes in gfs2_write_jdata_pagevec

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

1 files changed, 30 insertions, 41 deletions

diff --git a/fs/gfs2/quota.c b/fs/gfs2/quota.c
index 636bccfd2bcf..c71f781db5d7 100644
--- a/fs/gfs2/quota.c
+++ b/fs/gfs2/quota.c
@@ -616,17 +616,9 @@ static int gfs2_adjust_quota(struct gfs2_inode *ip, loff_t loc,
         s64 value;
         int err = -EIO;
 
-        if (gfs2_is_stuffed(ip)) {
-                struct gfs2_alloc *al = gfs2_alloc_get(ip);
-                if (!al)
-                        return -ENOMEM;
-                /* just request 1 blk */
-                al->al_requested = 1;
-                gfs2_inplace_reserve(ip);
+        if (gfs2_is_stuffed(ip))
                 gfs2_unstuff_dinode(ip, NULL);
-                gfs2_inplace_release(ip);
-                gfs2_alloc_put(ip);
-        }
+        
         page = grab_cache_page(mapping, index);
         if (!page)
                 return -ENOMEM;
@@ -691,7 +683,7 @@ static int do_sync(unsigned int num_qd, struct gfs2_quota_data **qda)
         unsigned int qx, x;
         struct gfs2_quota_data *qd;
         loff_t offset;
-        unsigned int nalloc = 0;
+        unsigned int nalloc = 0, blocks;
         struct gfs2_alloc *al = NULL;
         int error;
 
@@ -728,34 +720,33 @@ static int do_sync(unsigned int num_qd, struct gfs2_quota_data **qda)
                         nalloc++;
         }
 
-        if (nalloc) {
-                al = gfs2_alloc_get(ip);
-                if (!al) {
-                        error = -ENOMEM;
-                        goto out_gunlock;
-                }
+        al = gfs2_alloc_get(ip);
+        if (!al) {
+                error = -ENOMEM;
+                goto out_gunlock;
+        }
+        /* 
+         * 1 blk for unstuffing inode if stuffed. We add this extra
+         * block to the reservation unconditionally. If the inode
+         * doesn't need unstuffing, the block will be released to the 
+         * rgrp since it won't be allocated during the transaction
+         */
+        al->al_requested = 1;
+        /* +1 in the end for block requested above for unstuffing */
+        blocks = num_qd * data_blocks + RES_DINODE + num_qd + 1;
 
-                al->al_requested = nalloc * (data_blocks + ind_blocks);
+        if (nalloc)
+                al->al_requested += nalloc * (data_blocks + ind_blocks);                
+        error = gfs2_inplace_reserve(ip);
+        if (error)
+                goto out_alloc;
 
-                error = gfs2_inplace_reserve(ip);
-                if (error)
-                        goto out_alloc;
-
-                error = gfs2_trans_begin(sdp,
-                                         al->al_rgd->rd_length +
-                                         num_qd * data_blocks +
-                                         nalloc * ind_blocks +
-                                         RES_DINODE + num_qd +
-                                         RES_STATFS, 0);
-                if (error)
-                        goto out_ipres;
-        } else {
-                error = gfs2_trans_begin(sdp,
-                                         num_qd * data_blocks +
-                                         RES_DINODE + num_qd, 0);
-                if (error)
-                        goto out_gunlock;
-        }
+        if (nalloc)
+                blocks += al->al_rgd->rd_length + nalloc * ind_blocks + RES_STATFS;
+
+        error = gfs2_trans_begin(sdp, blocks, 0);
+        if (error)
+                goto out_ipres;
 
         for (x = 0; x < num_qd; x++) {
                 qd = qda[x];
@@ -774,11 +765,9 @@ static int do_sync(unsigned int num_qd, struct gfs2_quota_data **qda)
 out_end_trans:
         gfs2_trans_end(sdp);
 out_ipres:
-        if (nalloc)
-                gfs2_inplace_release(ip);
+        gfs2_inplace_release(ip);
 out_alloc:
-        if (nalloc)
-                gfs2_alloc_put(ip);
+        gfs2_alloc_put(ip);
 out_gunlock:
         gfs2_glock_dq_uninit(&i_gh);
 out: