[XFS] Fix a realtime allocator regression introduced by an old iget race

fix.  Noticed by Roger Willcocks.

SGI-PV: 949821
SGI-Modid: xfs-linux-melb:xfs-kern:25257a

Signed-off-by: Nathan Scott <nathans@sgi.com>

diff --git a/fs/xfs/xfs_rtalloc.c b/fs/xfs/xfs_rtalloc.c
index 06fc061..5b41394 100644 (file)
--- a/fs/xfs/xfs_rtalloc.c
+++ b/fs/xfs/xfs_rtalloc.c
@@ -130,7 +130,8 @@ xfs_growfs_rt_alloc(
                /*
                 * Lock the inode.
                 */
-               if ((error = xfs_trans_iget(mp, tp, ino, 0, XFS_ILOCK_EXCL, &ip)))
+               if ((error = xfs_trans_iget(mp, tp, ino, 0,
+                                               XFS_ILOCK_EXCL, &ip)))
                        goto error_exit;
                XFS_BMAP_INIT(&flist, &firstblock);
                /*
@@ -170,8 +171,8 @@ xfs_growfs_rt_alloc(
                        /*
                         * Lock the bitmap inode.
                         */
-                       if ((error = xfs_trans_iget(mp, tp, ino, 0, XFS_ILOCK_EXCL,
-                                       &ip)))
+                       if ((error = xfs_trans_iget(mp, tp, ino, 0,
+                                                       XFS_ILOCK_EXCL, &ip)))
                                goto error_exit;
                        /*
                         * Get a buffer for the block.
@@ -2023,8 +2024,8 @@ xfs_growfs_rt(
                /*
                 * Lock out other callers by grabbing the bitmap inode lock.
                 */
-               if ((error = xfs_trans_iget(mp, tp, 0, mp->m_sb.sb_rbmino,
-                               XFS_ILOCK_EXCL, &ip)))
+               if ((error = xfs_trans_iget(mp, tp, mp->m_sb.sb_rbmino, 0,
+                                               XFS_ILOCK_EXCL, &ip)))
                        goto error_exit;
                ASSERT(ip == mp->m_rbmip);
                /*
@@ -2037,8 +2038,8 @@ xfs_growfs_rt(
                /*
                 * Get the summary inode into the transaction.
                 */
-               if ((error = xfs_trans_iget(mp, tp, mp->m_sb.sb_rsumino,
-                               0, XFS_ILOCK_EXCL, &ip)))
+               if ((error = xfs_trans_iget(mp, tp, mp->m_sb.sb_rsumino, 0,
+                                               XFS_ILOCK_EXCL, &ip)))
                        goto error_exit;
                ASSERT(ip == mp->m_rsumip);
                /*
@@ -2158,10 +2159,9 @@ xfs_rtallocate_extent(
        /*
         * Lock out other callers by grabbing the bitmap inode lock.
         */
-       error = xfs_trans_iget(mp, tp, mp->m_sb.sb_rbmino, 0, XFS_ILOCK_EXCL, &ip);
-       if (error) {
+       if ((error = xfs_trans_iget(mp, tp, mp->m_sb.sb_rbmino, 0,
+                                       XFS_ILOCK_EXCL, &ip)))
                return error;
-       }
        sumbp = NULL;
        /*
         * Allocate by size, or near another block, or exactly at some block.
@@ -2221,10 +2221,9 @@ xfs_rtfree_extent(
        /*
         * Synchronize by locking the bitmap inode.
         */
-       error = xfs_trans_iget(mp, tp, mp->m_sb.sb_rbmino, 0, XFS_ILOCK_EXCL, &ip);
-       if (error) {
+       if ((error = xfs_trans_iget(mp, tp, mp->m_sb.sb_rbmino, 0,
+                                       XFS_ILOCK_EXCL, &ip)))
                return error;
-       }
 #if defined(__KERNEL__) && defined(DEBUG)
        /*
         * Check to see that this whole range is currently allocated.
@@ -2365,8 +2364,8 @@ xfs_rtpick_extent(
        __uint64_t      seq;            /* sequence number of file creation */
        __uint64_t      *seqp;          /* pointer to seqno in inode */
 
-       error = xfs_trans_iget(mp, tp, mp->m_sb.sb_rbmino, 0, XFS_ILOCK_EXCL, &ip);
-       if (error)
+       if ((error = xfs_trans_iget(mp, tp, mp->m_sb.sb_rbmino, 0,
+                                       XFS_ILOCK_EXCL, &ip)))
                return error;
        ASSERT(ip == mp->m_rbmip);
        seqp = (__uint64_t *)&ip->i_d.di_atime;