xfs: limit extent length for allocation to AG size

[mv-sheeva.git] / fs / xfs / xfs_bmap.c

diff --git a/fs/xfs/xfs_bmap.c b/fs/xfs/xfs_bmap.c
index 4111cd3966c764b3c41300d1e7a51a7579ead435..f3a3768189bbe7b22b5e03127b6cbea748123704 100644 (file)
--- a/fs/xfs/xfs_bmap.c
+++ b/fs/xfs/xfs_bmap.c
@@ -2430,7 +2430,7 @@ xfs_bmap_btalloc_nullfb(
                startag = ag = 0;
 
        pag = xfs_perag_get(mp, ag);
-       while (*blen < ap->alen) {
+       while (*blen < args->maxlen) {
                if (!pag->pagf_init) {
                        error = xfs_alloc_pagf_init(mp, args->tp, ag,
                                                    XFS_ALLOC_FLAG_TRYLOCK);
@@ -2452,7 +2452,7 @@ xfs_bmap_btalloc_nullfb(
                        notinit = 1;
 
                if (xfs_inode_is_filestream(ap->ip)) {
-                       if (*blen >= ap->alen)
+                       if (*blen >= args->maxlen)
                                break;
 
                        if (ap->userdata) {
@@ -2498,14 +2498,14 @@ xfs_bmap_btalloc_nullfb(
         * If the best seen length is less than the request
         * length, use the best as the minimum.
         */
-       else if (*blen < ap->alen)
+       else if (*blen < args->maxlen)
                args->minlen = *blen;
        /*
-        * Otherwise we've seen an extent as big as alen,
+        * Otherwise we've seen an extent as big as maxlen,
         * use that as the minimum.
         */
        else
-               args->minlen = ap->alen;
+               args->minlen = args->maxlen;
 
        /*
         * set the failure fallback case to look in the selected
@@ -2573,7 +2573,9 @@ xfs_bmap_btalloc(
        args.tp = ap->tp;
        args.mp = mp;
        args.fsbno = ap->rval;
-       args.maxlen = MIN(ap->alen, mp->m_sb.sb_agblocks);
+
+       /* Trim the allocation back to the maximum an AG can fit. */
+       args.maxlen = MIN(ap->alen, XFS_ALLOC_AG_MAX_USABLE(mp));
        args.firstblock = ap->firstblock;
        blen = 0;
        if (nullfb) {
@@ -2621,7 +2623,7 @@ xfs_bmap_btalloc(
                        /*
                         * Adjust for alignment
                         */
-                       if (blen > args.alignment && blen <= ap->alen)
+                       if (blen > args.alignment && blen <= args.maxlen)
                                args.minlen = blen - args.alignment;
                        args.minalignslop = 0;
                } else {
@@ -2640,7 +2642,7 @@ xfs_bmap_btalloc(
                         * of minlen+alignment+slop doesn't go up
                         * between the calls.
                         */
-                       if (blen > mp->m_dalign && blen <= ap->alen)
+                       if (blen > mp->m_dalign && blen <= args.maxlen)
                                nextminlen = blen - mp->m_dalign;
                        else
                                nextminlen = args.minlen;