[XFS] Minor code rearranging and cleanup to prevent some coverity false

positives.

SGI-PV: 955502
SGI-Modid: xfs-linux-melb:xfs-kern:26805a

Signed-off-by: Nathan Scott <nathans@sgi.com>
Signed-off-by: Tim Shimmin <tes@sgi.com>

diff --git a/fs/xfs/xfs_alloc.c b/fs/xfs/xfs_alloc.c
index 879aa38..e80dda3 100644 (file)
--- a/fs/xfs/xfs_alloc.c
+++ b/fs/xfs/xfs_alloc.c
@@ -1477,8 +1477,10 @@ xfs_alloc_ag_vextent_small(
        /*
         * Can't allocate from the freelist for some reason.
         */
-       else
+       else {
+               fbno = NULLAGBLOCK;
                flen = 0;
+       }
        /*
         * Can't do the allocation, give up.
         */

diff --git a/fs/xfs/xfs_da_btree.c b/fs/xfs/xfs_da_btree.c
index 32ab61d..a68bc1f 100644 (file)
--- a/fs/xfs/xfs_da_btree.c
+++ b/fs/xfs/xfs_da_btree.c
@@ -1054,7 +1054,7 @@ xfs_da_node_lookup_int(xfs_da_state_t *state, int *result)
        xfs_da_node_entry_t *btree;
        xfs_dablk_t blkno;
        int probe, span, max, error, retval;
-       xfs_dahash_t hashval;
+       xfs_dahash_t hashval, btreehashval;
        xfs_da_args_t *args;
 
        args = state->args;
@@ -1079,30 +1079,32 @@ xfs_da_node_lookup_int(xfs_da_state_t *state, int *result)
                        return(error);
                }
                curr = blk->bp->data;
-               ASSERT(be16_to_cpu(curr->magic) == XFS_DA_NODE_MAGIC ||
-                      be16_to_cpu(curr->magic) == XFS_DIR2_LEAFN_MAGIC ||
-                      be16_to_cpu(curr->magic) == XFS_ATTR_LEAF_MAGIC);
+               blk->magic = be16_to_cpu(curr->magic);
+               ASSERT(blk->magic == XFS_DA_NODE_MAGIC ||
+                      blk->magic == XFS_DIR2_LEAFN_MAGIC ||
+                      blk->magic == XFS_ATTR_LEAF_MAGIC);
 
                /*
                 * Search an intermediate node for a match.
                 */
-               blk->magic = be16_to_cpu(curr->magic);
                if (blk->magic == XFS_DA_NODE_MAGIC) {
                        node = blk->bp->data;
-                       blk->hashval = be32_to_cpu(node->btree[be16_to_cpu(node->hdr.count)-1].hashval);
+                       max = be16_to_cpu(node->hdr.count);
+                       btreehashval = node->btree[max-1].hashval;
+                       blk->hashval = be32_to_cpu(btreehashval);
 
                        /*
                         * Binary search.  (note: small blocks will skip loop)
                         */
-                       max = be16_to_cpu(node->hdr.count);
                        probe = span = max / 2;
                        hashval = args->hashval;
                        for (btree = &node->btree[probe]; span > 4;
                                   btree = &node->btree[probe]) {
                                span /= 2;
-                               if (be32_to_cpu(btree->hashval) < hashval)
+                               btreehashval = be32_to_cpu(btree->hashval);
+                               if (btreehashval < hashval)
                                        probe += span;
-                               else if (be32_to_cpu(btree->hashval) > hashval)
+                               else if (btreehashval > hashval)
                                        probe -= span;
                                else
                                        break;
@@ -1133,10 +1135,10 @@ xfs_da_node_lookup_int(xfs_da_state_t *state, int *result)
                                blk->index = probe;
                                blkno = be32_to_cpu(btree->before);
                        }
-               } else if (be16_to_cpu(curr->magic) == XFS_ATTR_LEAF_MAGIC) {
+               } else if (blk->magic == XFS_ATTR_LEAF_MAGIC) {
                        blk->hashval = xfs_attr_leaf_lasthash(blk->bp, NULL);
                        break;
-               } else if (be16_to_cpu(curr->magic) == XFS_DIR2_LEAFN_MAGIC) {
+               } else if (blk->magic == XFS_DIR2_LEAFN_MAGIC) {
                        blk->hashval = xfs_dir2_leafn_lasthash(blk->bp, NULL);
                        break;
                }
@@ -1152,11 +1154,13 @@ xfs_da_node_lookup_int(xfs_da_state_t *state, int *result)
                if (blk->magic == XFS_DIR2_LEAFN_MAGIC) {
                        retval = xfs_dir2_leafn_lookup_int(blk->bp, args,
                                                        &blk->index, state);
-               }
-               else if (blk->magic == XFS_ATTR_LEAF_MAGIC) {
+               } else if (blk->magic == XFS_ATTR_LEAF_MAGIC) {
                        retval = xfs_attr_leaf_lookup_int(blk->bp, args);
                        blk->index = args->index;
                        args->blkno = blk->blkno;
+               } else {
+                       ASSERT(0);
+                       return XFS_ERROR(EFSCORRUPTED);
                }
                if (((retval == ENOENT) || (retval == ENOATTR)) &&
                    (blk->hashval == args->hashval)) {
@@ -1166,8 +1170,7 @@ xfs_da_node_lookup_int(xfs_da_state_t *state, int *result)
                                return(error);
                        if (retval == 0) {
                                continue;
-                       }
-                       else if (blk->magic == XFS_ATTR_LEAF_MAGIC) {
+                       } else if (blk->magic == XFS_ATTR_LEAF_MAGIC) {
                                /* path_shift() gives ENOENT */
                                retval = XFS_ERROR(ENOATTR);
                        }

diff --git a/fs/xfs/xfs_rtalloc.c b/fs/xfs/xfs_rtalloc.c
index 5a0b678..e050987 100644 (file)
--- a/fs/xfs/xfs_rtalloc.c
+++ b/fs/xfs/xfs_rtalloc.c
@@ -1976,7 +1976,10 @@ xfs_growfs_rt(
        if ((error = xfs_growfs_rt_alloc(mp, rsumblocks, nrsumblocks,
                        mp->m_sb.sb_rsumino)))
                return error;
-       nmp = NULL;
+       /*
+        * Allocate a new (fake) mount/sb.
+        */
+       nmp = kmem_alloc(sizeof(*nmp), KM_SLEEP);
        /*
         * Loop over the bitmap blocks.
         * We will do everything one bitmap block at a time.
@@ -1987,10 +1990,6 @@ xfs_growfs_rt(
                     ((sbp->sb_rextents & ((1 << mp->m_blkbit_log) - 1)) != 0);
             bmbno < nrbmblocks;
             bmbno++) {
-               /*
-                * Allocate a new (fake) mount/sb.
-                */
-               nmp = kmem_alloc(sizeof(*nmp), KM_SLEEP);
                *nmp = *mp;
                nsbp = &nmp->m_sb;
                /*
@@ -2018,13 +2017,13 @@ xfs_growfs_rt(
                cancelflags = 0;
                if ((error = xfs_trans_reserve(tp, 0,
                                XFS_GROWRTFREE_LOG_RES(nmp), 0, 0, 0)))
-                       goto error_exit;
+                       break;
                /*
                 * Lock out other callers by grabbing the bitmap inode lock.
                 */
                if ((error = xfs_trans_iget(mp, tp, mp->m_sb.sb_rbmino, 0,
                                                XFS_ILOCK_EXCL, &ip)))
-                       goto error_exit;
+                       break;
                ASSERT(ip == mp->m_rbmip);
                /*
                 * Update the bitmap inode's size.
@@ -2038,7 +2037,7 @@ xfs_growfs_rt(
                 */
                if ((error = xfs_trans_iget(mp, tp, mp->m_sb.sb_rsumino, 0,
                                                XFS_ILOCK_EXCL, &ip)))
-                       goto error_exit;
+                       break;
                ASSERT(ip == mp->m_rsumip);
                /*
                 * Update the summary inode's size.
@@ -2053,7 +2052,7 @@ xfs_growfs_rt(
                    mp->m_rsumlevels != nmp->m_rsumlevels) {
                        error = xfs_rtcopy_summary(mp, nmp, tp);
                        if (error)
-                               goto error_exit;
+                               break;
                }
                /*
                 * Update superblock fields.
@@ -2080,17 +2079,12 @@ xfs_growfs_rt(
                error = xfs_rtfree_range(nmp, tp, sbp->sb_rextents,
                        nsbp->sb_rextents - sbp->sb_rextents, &bp, &sumbno);
                if (error)
-                       goto error_exit;
+                       break;
                /*
                 * Mark more blocks free in the superblock.
                 */
                xfs_trans_mod_sb(tp, XFS_TRANS_SB_FREXTENTS,
                        nsbp->sb_rextents - sbp->sb_rextents);
-               /*
-                * Free the fake mp structure.
-                */
-               kmem_free(nmp, sizeof(*nmp));
-               nmp = NULL;
                /*
                 * Update mp values into the real mp structure.
                 */
@@ -2101,15 +2095,15 @@ xfs_growfs_rt(
                 */
                xfs_trans_commit(tp, 0, NULL);
        }
-       return 0;
+
+       if (error)
+               xfs_trans_cancel(tp, cancelflags);
 
        /*
-        * Error paths come here.
+        * Free the fake mp structure.
         */
-error_exit:
-       if (nmp)
-               kmem_free(nmp, sizeof(*nmp));
-       xfs_trans_cancel(tp, cancelflags);
+       kmem_free(nmp, sizeof(*nmp));
+
        return error;
 }