Merge branch 'for-linus' of git://oss.sgi.com/xfs/xfs

* 'for-linus' of git://oss.sgi.com/xfs/xfs:
  xfs: correctly decrement the extent buffer index in xfs_bmap_del_extent
  xfs: check for valid indices in xfs_iext_get_ext and xfs_iext_idx_to_irec
  xfs: fix up asserts in xfs_iflush_fork
  xfs: do not do pointer arithmetic on extent records
  xfs: do not use unchecked extent indices in xfs_bunmapi
  xfs: do not use unchecked extent indices in xfs_bmapi
  xfs: do not use unchecked extent indices in xfs_bmap_add_extent_*
  xfs: remove if_lastex
  xfs: remove the unused XFS_BMAPI_RSVBLOCKS flag
  xfs: do not discard alloc btree blocks
  xfs: add online discard support

1 files changed, 7 insertions, 8 deletions

diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
index c8e3349c287c..a098a20ca63e 100644
--- a/fs/xfs/xfs_inode.c
+++ b/fs/xfs/xfs_inode.c
@@ -920,7 +920,6 @@ xfs_iread_extents(
         /*
          * We know that the size is valid (it's checked in iformat_btree)
          */
-        ifp->if_lastex = NULLEXTNUM;
         ifp->if_bytes = ifp->if_real_bytes = 0;
         ifp->if_flags |= XFS_IFEXTENTS;
         xfs_iext_add(ifp, 0, nextents);
@@ -2558,12 +2557,9 @@ xfs_iflush_fork(
         case XFS_DINODE_FMT_EXTENTS:
                 ASSERT((ifp->if_flags & XFS_IFEXTENTS) ||
                        !(iip->ili_format.ilf_fields & extflag[whichfork]));
-                ASSERT((xfs_iext_get_ext(ifp, 0) != NULL) ||
-                        (ifp->if_bytes == 0));
-                ASSERT((xfs_iext_get_ext(ifp, 0) == NULL) ||
-                        (ifp->if_bytes > 0));
                 if ((iip->ili_format.ilf_fields & extflag[whichfork]) &&
                     (ifp->if_bytes > 0)) {
+                        ASSERT(xfs_iext_get_ext(ifp, 0));
                         ASSERT(XFS_IFORK_NEXTENTS(ip, whichfork) > 0);
                         (void)xfs_iextents_copy(ip, (xfs_bmbt_rec_t *)cp,
                                 whichfork);
@@ -3112,6 +3108,8 @@ xfs_iext_get_ext(
         xfs_extnum_t    idx)            /* index of target extent */
 {
         ASSERT(idx >= 0);
+        ASSERT(idx < ifp->if_bytes / sizeof(xfs_bmbt_rec_t));
+
         if ((ifp->if_flags & XFS_IFEXTIREC) && (idx == 0)) {
                 return ifp->if_u1.if_ext_irec->er_extbuf;
         } else if (ifp->if_flags & XFS_IFEXTIREC) {
@@ -3191,7 +3189,6 @@ xfs_iext_add(
                 }
                 ifp->if_u1.if_extents = ifp->if_u2.if_inline_ext;
                 ifp->if_real_bytes = 0;
-                ifp->if_lastex = nextents + ext_diff;
         }
         /*
          * Otherwise use a linear (direct) extent list.
@@ -3886,8 +3883,10 @@ xfs_iext_idx_to_irec(
         xfs_extnum_t    page_idx = *idxp; /* extent index in target list */
 
         ASSERT(ifp->if_flags & XFS_IFEXTIREC);
-        ASSERT(page_idx >= 0 && page_idx <=
-                ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t));
+        ASSERT(page_idx >= 0);
+        ASSERT(page_idx <= ifp->if_bytes / sizeof(xfs_bmbt_rec_t));
+        ASSERT(page_idx < ifp->if_bytes / sizeof(xfs_bmbt_rec_t) || realloc);
+
         nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ;
         erp_idx = 0;
         low = 0;