hwmon: add TI ads7871 a/d converter driver

[safe/jmp/linux-2.6] / fs / xfs / xfs_fsops.c

diff --git a/fs/xfs/xfs_fsops.c b/fs/xfs/xfs_fsops.c
index a13919a..37a6f62 100644 (file)
--- a/fs/xfs/xfs_fsops.c
+++ b/fs/xfs/xfs_fsops.c
@@ -167,27 +167,14 @@ xfs_growfs_data_private(
        }
        new = nb - mp->m_sb.sb_dblocks;
        oagcount = mp->m_sb.sb_agcount;
-       if (nagcount > oagcount) {
-               void *new_perag, *old_perag;
-
-               xfs_filestream_flush(mp);
-
-               new_perag = kmem_zalloc(sizeof(xfs_perag_t) * nagcount,
-                                       KM_MAYFAIL);
-               if (!new_perag)
-                       return XFS_ERROR(ENOMEM);
-
-               down_write(&mp->m_peraglock);
-               memcpy(new_perag, mp->m_perag, sizeof(xfs_perag_t) * oagcount);
-               old_perag = mp->m_perag;
-               mp->m_perag = new_perag;
-
-               mp->m_flags |= XFS_MOUNT_32BITINODES;
-               nagimax = xfs_initialize_perag(mp, nagcount);
-               up_write(&mp->m_peraglock);
 
-               kmem_free(old_perag);
+       /* allocate the new per-ag structures */
+       if (nagcount > oagcount) {
+               error = xfs_initialize_perag(mp, nagcount, &nagimax);
+               if (error)
+                       return error;
        }
+
        tp = xfs_trans_alloc(mp, XFS_TRANS_GROWFS);
        tp->t_flags |= XFS_TRANS_RESERVE;
        if ((error = xfs_trans_reserve(tp, XFS_GROWFS_SPACE_RES(mp),
@@ -196,6 +183,11 @@ xfs_growfs_data_private(
                return error;
        }
 
+       /*
+        * Write new AG headers to disk. Non-transactional, but written
+        * synchronously so they are completed prior to the growfs transaction
+        * being logged.
+        */
        nfree = 0;
        for (agno = nagcount - 1; agno >= oagcount; agno--, new -= agsize) {
                /*
@@ -359,6 +351,12 @@ xfs_growfs_data_private(
                        goto error0;
                }
        }
+
+       /*
+        * Update changed superblock fields transactionally. These are not
+        * seen by the rest of the world until the transaction commit applies
+        * them atomically to the superblock.
+        */
        if (nagcount > oagcount)
                xfs_trans_mod_sb(tp, XFS_TRANS_SB_AGCOUNT, nagcount - oagcount);
        if (nb > mp->m_sb.sb_dblocks)
@@ -369,9 +367,9 @@ xfs_growfs_data_private(
        if (dpct)
                xfs_trans_mod_sb(tp, XFS_TRANS_SB_IMAXPCT, dpct);
        error = xfs_trans_commit(tp, 0);
-       if (error) {
+       if (error)
                return error;
-       }
+
        /* New allocation groups fully initialized, so update mount struct */
        if (nagimax)
                mp->m_maxagi = nagimax;
@@ -381,6 +379,8 @@ xfs_growfs_data_private(
                mp->m_maxicount = icount << mp->m_sb.sb_inopblog;
        } else
                mp->m_maxicount = 0;
+
+       /* update secondary superblocks. */
        for (agno = 1; agno < nagcount; agno++) {
                error = xfs_read_buf(mp, mp->m_ddev_targp,
                                  XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)),