1 files changed, 83 insertions, 116 deletions

diff --git a/fs/xfs/xfs_bmap.c b/fs/xfs/xfs_bmap.c
index 89042848f9ec..05c698ccb238 100644
--- a/fs/xfs/xfs_bmap.c
+++ b/fs/xfs/xfs_bmap.c
@@ -1161,6 +1161,24 @@ xfs_bmap_extents_to_btree(
  * since the file data needs to get logged so things will stay consistent.
  * (The bmap-level manipulations are ok, though).
  */
+void
+xfs_bmap_local_to_extents_empty(
+        struct xfs_inode        *ip,
+        int                     whichfork)
+{
+        struct xfs_ifork        *ifp = XFS_IFORK_PTR(ip, whichfork);
+
+        ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL);
+        ASSERT(ifp->if_bytes == 0);
+        ASSERT(XFS_IFORK_NEXTENTS(ip, whichfork) == 0);
+
+        xfs_bmap_forkoff_reset(ip->i_mount, ip, whichfork);
+        ifp->if_flags &= ~XFS_IFINLINE;
+        ifp->if_flags |= XFS_IFEXTENTS;
+        XFS_IFORK_FMT_SET(ip, whichfork, XFS_DINODE_FMT_EXTENTS);
+}
+
+
 STATIC int                              /* error */
 xfs_bmap_local_to_extents(
         xfs_trans_t     *tp,            /* transaction pointer */
@@ -1174,9 +1192,12 @@ xfs_bmap_local_to_extents(
                                    struct xfs_inode *ip,
                                    struct xfs_ifork *ifp))
 {
-        int             error;          /* error return value */
+        int             error = 0;
         int             flags;          /* logging flags returned */
         xfs_ifork_t     *ifp;           /* inode fork pointer */
+        xfs_alloc_arg_t args;           /* allocation arguments */
+        xfs_buf_t       *bp;            /* buffer for extent block */
+        xfs_bmbt_rec_host_t *ep;        /* extent record pointer */
 
         /*
          * We don't want to deal with the case of keeping inode data inline yet.
@@ -1185,68 +1206,65 @@ xfs_bmap_local_to_extents(
         ASSERT(!(S_ISREG(ip->i_d.di_mode) && whichfork == XFS_DATA_FORK));
         ifp = XFS_IFORK_PTR(ip, whichfork);
         ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL);
+
+        if (!ifp->if_bytes) {
+                xfs_bmap_local_to_extents_empty(ip, whichfork);
+                flags = XFS_ILOG_CORE;
+                goto done;
+        }
+
         flags = 0;
         error = 0;
-        if (ifp->if_bytes) {
-                xfs_alloc_arg_t args;   /* allocation arguments */
-                xfs_buf_t       *bp;    /* buffer for extent block */
-                xfs_bmbt_rec_host_t *ep;/* extent record pointer */
-
-                ASSERT((ifp->if_flags &
-                        (XFS_IFINLINE|XFS_IFEXTENTS|XFS_IFEXTIREC)) == XFS_IFINLINE);
-                memset(&args, 0, sizeof(args));
-                args.tp = tp;
-                args.mp = ip->i_mount;
-                args.firstblock = *firstblock;
-                /*
-                 * Allocate a block.  We know we need only one, since the
-                 * file currently fits in an inode.
-                 */
-                if (*firstblock == NULLFSBLOCK) {
-                        args.fsbno = XFS_INO_TO_FSB(args.mp, ip->i_ino);
-                        args.type = XFS_ALLOCTYPE_START_BNO;
-                } else {
-                        args.fsbno = *firstblock;
-                        args.type = XFS_ALLOCTYPE_NEAR_BNO;
-                }
-                args.total = total;
-                args.minlen = args.maxlen = args.prod = 1;
-                error = xfs_alloc_vextent(&args);
-                if (error)
-                        goto done;
-
-                /* Can't fail, the space was reserved. */
-                ASSERT(args.fsbno != NULLFSBLOCK);
-                ASSERT(args.len == 1);
-                *firstblock = args.fsbno;
-                bp = xfs_btree_get_bufl(args.mp, tp, args.fsbno, 0);
-
-                /* initialise the block and copy the data */
-                init_fn(tp, bp, ip, ifp);
-
-                /* account for the change in fork size and log everything */
-                xfs_trans_log_buf(tp, bp, 0, ifp->if_bytes - 1);
-                xfs_bmap_forkoff_reset(args.mp, ip, whichfork);
-                xfs_idata_realloc(ip, -ifp->if_bytes, whichfork);
-                xfs_iext_add(ifp, 0, 1);
-                ep = xfs_iext_get_ext(ifp, 0);
-                xfs_bmbt_set_allf(ep, 0, args.fsbno, 1, XFS_EXT_NORM);
-                trace_xfs_bmap_post_update(ip, 0,
-                                whichfork == XFS_ATTR_FORK ? BMAP_ATTRFORK : 0,
-                                _THIS_IP_);
-                XFS_IFORK_NEXT_SET(ip, whichfork, 1);
-                ip->i_d.di_nblocks = 1;
-                xfs_trans_mod_dquot_byino(tp, ip,
-                        XFS_TRANS_DQ_BCOUNT, 1L);
-                flags |= xfs_ilog_fext(whichfork);
+        ASSERT((ifp->if_flags & (XFS_IFINLINE|XFS_IFEXTENTS|XFS_IFEXTIREC)) ==
+                                                                XFS_IFINLINE);
+        memset(&args, 0, sizeof(args));
+        args.tp = tp;
+        args.mp = ip->i_mount;
+        args.firstblock = *firstblock;
+        /*
+         * Allocate a block.  We know we need only one, since the
+         * file currently fits in an inode.
+         */
+        if (*firstblock == NULLFSBLOCK) {
+                args.fsbno = XFS_INO_TO_FSB(args.mp, ip->i_ino);
+                args.type = XFS_ALLOCTYPE_START_BNO;
         } else {
-                ASSERT(XFS_IFORK_NEXTENTS(ip, whichfork) == 0);
-                xfs_bmap_forkoff_reset(ip->i_mount, ip, whichfork);
+                args.fsbno = *firstblock;
+                args.type = XFS_ALLOCTYPE_NEAR_BNO;
         }
-        ifp->if_flags &= ~XFS_IFINLINE;
-        ifp->if_flags |= XFS_IFEXTENTS;
-        XFS_IFORK_FMT_SET(ip, whichfork, XFS_DINODE_FMT_EXTENTS);
+        args.total = total;
+        args.minlen = args.maxlen = args.prod = 1;
+        error = xfs_alloc_vextent(&args);
+        if (error)
+                goto done;
+
+        /* Can't fail, the space was reserved. */
+        ASSERT(args.fsbno != NULLFSBLOCK);
+        ASSERT(args.len == 1);
+        *firstblock = args.fsbno;
+        bp = xfs_btree_get_bufl(args.mp, tp, args.fsbno, 0);
+
+        /* initialise the block and copy the data */
+        init_fn(tp, bp, ip, ifp);
+
+        /* account for the change in fork size and log everything */
+        xfs_trans_log_buf(tp, bp, 0, ifp->if_bytes - 1);
+        xfs_idata_realloc(ip, -ifp->if_bytes, whichfork);
+        xfs_bmap_local_to_extents_empty(ip, whichfork);
         flags |= XFS_ILOG_CORE;
+
+        xfs_iext_add(ifp, 0, 1);
+        ep = xfs_iext_get_ext(ifp, 0);
+        xfs_bmbt_set_allf(ep, 0, args.fsbno, 1, XFS_EXT_NORM);
+        trace_xfs_bmap_post_update(ip, 0,
+                        whichfork == XFS_ATTR_FORK ? BMAP_ATTRFORK : 0,
+                        _THIS_IP_);
+        XFS_IFORK_NEXT_SET(ip, whichfork, 1);
+        ip->i_d.di_nblocks = 1;
+        xfs_trans_mod_dquot_byino(tp, ip,
+                XFS_TRANS_DQ_BCOUNT, 1L);
+        flags |= xfs_ilog_fext(whichfork);
+
 done:
         *logflagsp = flags;
         return error;
@@ -1323,25 +1341,6 @@ xfs_bmap_add_attrfork_extents(
 }
 
 /*
- * Block initialisation function for local to extent format conversion.
- *
- * This shouldn't actually be called by anyone, so make sure debug kernels cause
- * a noticable failure.
- */
-STATIC void
-xfs_bmap_local_to_extents_init_fn(
-        struct xfs_trans        *tp,
-        struct xfs_buf          *bp,
-        struct xfs_inode        *ip,
-        struct xfs_ifork        *ifp)
-{
-        ASSERT(0);
-        bp->b_ops = &xfs_bmbt_buf_ops;
-        memcpy(bp->b_addr, ifp->if_u1.if_data, ifp->if_bytes);
-        xfs_trans_buf_set_type(tp, bp, XFS_BLFT_BTREE_BUF);
-}
-
-/*
  * Called from xfs_bmap_add_attrfork to handle local format files. Each
  * different data fork content type needs a different callout to do the
  * conversion. Some are basic and only require special block initialisation
@@ -1381,9 +1380,9 @@ xfs_bmap_add_attrfork_local(
                                                  flags, XFS_DATA_FORK,
                                                  xfs_symlink_local_to_remote);
 
-        return xfs_bmap_local_to_extents(tp, ip, firstblock, 1, flags,
-                                         XFS_DATA_FORK,
-                                         xfs_bmap_local_to_extents_init_fn);
+        /* should only be called for types that support local format data */
+        ASSERT(0);
+        return EFSCORRUPTED;
 }
 
 /*
@@ -4907,20 +4906,19 @@ xfs_bmapi_write(
         orig_mval = mval;
         orig_nmap = *nmap;
 #endif
+        whichfork = (flags & XFS_BMAPI_ATTRFORK) ?
+                XFS_ATTR_FORK : XFS_DATA_FORK;
 
         ASSERT(*nmap >= 1);
         ASSERT(*nmap <= XFS_BMAP_MAX_NMAP);
         ASSERT(!(flags & XFS_BMAPI_IGSTATE));
         ASSERT(tp != NULL);
         ASSERT(len > 0);
-
-        whichfork = (flags & XFS_BMAPI_ATTRFORK) ?
-                XFS_ATTR_FORK : XFS_DATA_FORK;
+        ASSERT(XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_LOCAL);
 
         if (unlikely(XFS_TEST_ERROR(
             (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS &&
-             XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE &&
-             XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_LOCAL),
+             XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE),
              mp, XFS_ERRTAG_BMAPIFORMAT, XFS_RANDOM_BMAPIFORMAT))) {
                 XFS_ERROR_REPORT("xfs_bmapi_write", XFS_ERRLEVEL_LOW, mp);
                 return XFS_ERROR(EFSCORRUPTED);
@@ -4933,37 +4931,6 @@ xfs_bmapi_write(
 
         XFS_STATS_INC(xs_blk_mapw);
 
-        if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL) {
-                /*
-                 * XXX (dgc): This assumes we are only called for inodes that
-                 * contain content neutral data in local format. Anything that
-                 * contains caller-specific data in local format that needs
-                 * transformation to move to a block format needs to do the
-                 * conversion to extent format itself.
-                 *
-                 * Directory data forks and attribute forks handle this
-                 * themselves, but with the addition of metadata verifiers every
-                 * data fork in local format now contains caller specific data
-                 * and as such conversion through this function is likely to be
-                 * broken.
-                 *
-                 * The only likely user of this branch is for remote symlinks,
-                 * but we cannot overwrite the data fork contents of the symlink
-                 * (EEXIST occurs higher up the stack) and so it will never go
-                 * from local format to extent format here. Hence I don't think
-                 * this branch is ever executed intentionally and we should
-                 * consider removing it and asserting that xfs_bmapi_write()
-                 * cannot be called directly on local format forks. i.e. callers
-                 * are completely responsible for local to extent format
-                 * conversion, not xfs_bmapi_write().
-                 */
-                error = xfs_bmap_local_to_extents(tp, ip, firstblock, total,
-                                        &bma.logflags, whichfork,
-                                        xfs_bmap_local_to_extents_init_fn);
-                if (error)
-                        goto error0;
-        }
-
         if (*firstblock == NULLFSBLOCK) {
                 if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE)
                         bma.minleft = be16_to_cpu(ifp->if_broot->bb_level) + 1;