Merge branches 'perf-urgent-for-linus' and 'sched-urgent-for-linus' of git://git...

[pandora-kernel.git] / fs / xfs / xfs_bmap.c

diff --git a/fs/xfs/xfs_bmap.c b/fs/xfs/xfs_bmap.c
index c68baeb..d0ab788 100644 (file)
--- a/fs/xfs/xfs_bmap.c
+++ b/fs/xfs/xfs_bmap.c
@@ -2383,6 +2383,8 @@ xfs_bmap_btalloc(
        int             tryagain;
        int             error;
 
+       ASSERT(ap->length);
+
        mp = ap->ip->i_mount;
        align = ap->userdata ? xfs_get_extsz_hint(ap->ip) : 0;
        if (unlikely(align)) {
@@ -4629,6 +4631,8 @@ xfs_bmapi_allocate(
        int                     error;
        int                     rt;
 
+       ASSERT(bma->length > 0);
+
        rt = (whichfork == XFS_DATA_FORK) && XFS_IS_REALTIME_INODE(bma->ip);
 
        /*
@@ -4849,6 +4853,7 @@ xfs_bmapi_write(
        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;
@@ -4918,9 +4923,22 @@ xfs_bmapi_write(
                        bma.eof = eof;
                        bma.conv = !!(flags & XFS_BMAPI_CONVERT);
                        bma.wasdel = wasdelay;
-                       bma.length = len;
                        bma.offset = bno;
 
+                       /*
+                        * There's a 32/64 bit type mismatch between the
+                        * allocation length request (which can be 64 bits in
+                        * length) and the bma length request, which is
+                        * xfs_extlen_t and therefore 32 bits. Hence we have to
+                        * check for 32-bit overflows and handle them here.
+                        */
+                       if (len > (xfs_filblks_t)MAXEXTLEN)
+                               bma.length = MAXEXTLEN;
+                       else
+                               bma.length = len;
+
+                       ASSERT(len > 0);
+                       ASSERT(bma.length > 0);
                        error = xfs_bmapi_allocate(&bma, flags);
                        if (error)
                                goto error0;