xfs: reorganize xfs_iomap_prealloc_size to remove indentation

The majority of xfs_iomap_prealloc_size() executes within the
check for lack of default I/O size. Reverse the logic to remove the
extra indentation.

Signed-off-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Ben Myers <bpm@sgi.com>
Reviewed-by: Mark Tinguely <tinguely@sgi.com>
Signed-off-by: Ben Myers <bpm@sgi.com>

diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c
index c8cb337efccf6923e474185548966fd7f9c43810..344557eef9288cc5d36460d8558331657a86fc27 100644 (file)
--- a/fs/xfs/xfs_iomap.c
+++ b/fs/xfs/xfs_iomap.c
@@ -381,42 +381,43 @@ xfs_iomap_prealloc_size(
        int                     nimaps)
 {
        xfs_fsblock_t           alloc_blocks = 0;
+       int                     shift = 0;
+       int64_t                 freesp;
 
        alloc_blocks = xfs_iomap_eof_prealloc_initial_size(mp, ip, offset,
                                                           imap, nimaps);
-       if (alloc_blocks > 0) {
-               int shift = 0;
-               int64_t freesp;
-
-               alloc_blocks = XFS_FILEOFF_MIN(MAXEXTLEN,
-                                       rounddown_pow_of_two(alloc_blocks));
-
-               xfs_icsb_sync_counters(mp, XFS_ICSB_LAZY_COUNT);
-               freesp = mp->m_sb.sb_fdblocks;
-               if (freesp < mp->m_low_space[XFS_LOWSP_5_PCNT]) {
-                       shift = 2;
-                       if (freesp < mp->m_low_space[XFS_LOWSP_4_PCNT])
-                               shift++;
-                       if (freesp < mp->m_low_space[XFS_LOWSP_3_PCNT])
-                               shift++;
-                       if (freesp < mp->m_low_space[XFS_LOWSP_2_PCNT])
-                               shift++;
-                       if (freesp < mp->m_low_space[XFS_LOWSP_1_PCNT])
-                               shift++;
-               }
-               if (shift)
-                       alloc_blocks >>= shift;
-
-               /*
-                * If we are still trying to allocate more space than is
-                * available, squash the prealloc hard. This can happen if we
-                * have a large file on a small filesystem and the above
-                * lowspace thresholds are smaller than MAXEXTLEN.
-                */
-               while (alloc_blocks && alloc_blocks >= freesp)
-                       alloc_blocks >>= 4;
+       if (!alloc_blocks)
+               goto check_writeio;
+
+       alloc_blocks = XFS_FILEOFF_MIN(MAXEXTLEN,
+                               rounddown_pow_of_two(alloc_blocks));
+
+       xfs_icsb_sync_counters(mp, XFS_ICSB_LAZY_COUNT);
+       freesp = mp->m_sb.sb_fdblocks;
+       if (freesp < mp->m_low_space[XFS_LOWSP_5_PCNT]) {
+               shift = 2;
+               if (freesp < mp->m_low_space[XFS_LOWSP_4_PCNT])
+                       shift++;
+               if (freesp < mp->m_low_space[XFS_LOWSP_3_PCNT])
+                       shift++;
+               if (freesp < mp->m_low_space[XFS_LOWSP_2_PCNT])
+                       shift++;
+               if (freesp < mp->m_low_space[XFS_LOWSP_1_PCNT])
+                       shift++;
        }
+       if (shift)
+               alloc_blocks >>= shift;
+
+       /*
+        * If we are still trying to allocate more space than is
+        * available, squash the prealloc hard. This can happen if we
+        * have a large file on a small filesystem and the above
+        * lowspace thresholds are smaller than MAXEXTLEN.
+        */
+       while (alloc_blocks && alloc_blocks >= freesp)
+               alloc_blocks >>= 4;
 
+check_writeio:
        if (alloc_blocks < mp->m_writeio_blocks)
                alloc_blocks = mp->m_writeio_blocks;