[PATCH] reiserfs: clean up bitmap block buffer head references

Similar to the SB_JOURNAL cleanup that was accepted a while ago, this patch
uses a temporary variable for buffer head references from the bitmap info
array.

This makes the code much more readable in some areas.

It also uses proper reference counting, doing a get_bh() after using the
pointer from the array and brelse()'ing it later.  This may seem silly, but a
later patch will replace the simple temporary variables with an actual read,
so the reference freeing will be used then.

Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Cc: <reiserfs-dev@namesys.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 35 insertions, 25 deletions

diff --git a/fs/reiserfs/resize.c b/fs/reiserfs/resize.c
index 39cc7f47f5dc..958b75978994 100644
--- a/fs/reiserfs/resize.c
+++ b/fs/reiserfs/resize.c
@@ -22,6 +22,7 @@ int reiserfs_resize(struct super_block *s, unsigned long block_count_new)
         int err = 0;
         struct reiserfs_super_block *sb;
         struct reiserfs_bitmap_info *bitmap;
+        struct reiserfs_bitmap_info *info;
         struct reiserfs_bitmap_info *old_bitmap = SB_AP_BITMAP(s);
         struct buffer_head *bh;
         struct reiserfs_transaction_handle th;
@@ -127,16 +128,19 @@ int reiserfs_resize(struct super_block *s, unsigned long block_count_new)
                  * transaction begins, and the new bitmaps don't matter if the
                  * transaction fails. */
                 for (i = bmap_nr; i < bmap_nr_new; i++) {
-                        bitmap[i].bh = sb_getblk(s, i * s->s_blocksize * 8);
-                        memset(bitmap[i].bh->b_data, 0, sb_blocksize(sb));
-                        reiserfs_test_and_set_le_bit(0, bitmap[i].bh->b_data);
-
-                        set_buffer_uptodate(bitmap[i].bh);
-                        mark_buffer_dirty(bitmap[i].bh);
-                        sync_dirty_buffer(bitmap[i].bh);
+                        bh = sb_getblk(s, i * s->s_blocksize * 8);
+                        get_bh(bh);
+                        memset(bh->b_data, 0, sb_blocksize(sb));
+                        reiserfs_test_and_set_le_bit(0, bh->b_data);
+
+                        set_buffer_uptodate(bh);
+                        mark_buffer_dirty(bh);
+                        sync_dirty_buffer(bh);
                         // update bitmap_info stuff
                         bitmap[i].first_zero_hint = 1;
                         bitmap[i].free_count = sb_blocksize(sb) * 8 - 1;
+                        bitmap[i].bh = bh;
+                        brelse(bh);
                 }
                 /* free old bitmap blocks array */
                 SB_AP_BITMAP(s) = bitmap;
@@ -150,30 +154,36 @@ int reiserfs_resize(struct super_block *s, unsigned long block_count_new)
         if (err)
                 return err;
 
-        /* correct last bitmap blocks in old and new disk layout */
-        reiserfs_prepare_for_journal(s, SB_AP_BITMAP(s)[bmap_nr - 1].bh, 1);
+        /* Extend old last bitmap block - new blocks have been made available */
+        info = SB_AP_BITMAP(s) + bmap_nr - 1;
+        bh = info->bh;
+        get_bh(bh);
+
+        reiserfs_prepare_for_journal(s, bh, 1);
         for (i = block_r; i < s->s_blocksize * 8; i++)
-                reiserfs_test_and_clear_le_bit(i,
-                                               SB_AP_BITMAP(s)[bmap_nr -
-                                                               1].bh->b_data);
-        SB_AP_BITMAP(s)[bmap_nr - 1].free_count += s->s_blocksize * 8 - block_r;
-        if (!SB_AP_BITMAP(s)[bmap_nr - 1].first_zero_hint)
-                SB_AP_BITMAP(s)[bmap_nr - 1].first_zero_hint = block_r;
+                reiserfs_test_and_clear_le_bit(i, bh->b_data);
+        info->free_count += s->s_blocksize * 8 - block_r;
+        if (!info->first_zero_hint)
+                info->first_zero_hint = block_r;
+
+        journal_mark_dirty(&th, s, bh);
+        brelse(bh);
 
-        journal_mark_dirty(&th, s, SB_AP_BITMAP(s)[bmap_nr - 1].bh);
+        /* Correct new last bitmap block - It may not be full */
+        info = SB_AP_BITMAP(s) + bmap_nr_new - 1;
+        bh = info->bh;
+        get_bh(bh);
 
-        reiserfs_prepare_for_journal(s, SB_AP_BITMAP(s)[bmap_nr_new - 1].bh, 1);
+        reiserfs_prepare_for_journal(s, bh, 1);
         for (i = block_r_new; i < s->s_blocksize * 8; i++)
-                reiserfs_test_and_set_le_bit(i,
-                                             SB_AP_BITMAP(s)[bmap_nr_new -
-                                                             1].bh->b_data);
-        journal_mark_dirty(&th, s, SB_AP_BITMAP(s)[bmap_nr_new - 1].bh);
+                reiserfs_test_and_set_le_bit(i, bh->b_data);
+        journal_mark_dirty(&th, s, bh);
+        brelse(bh);
 
-        SB_AP_BITMAP(s)[bmap_nr_new - 1].free_count -=
-            s->s_blocksize * 8 - block_r_new;
+        info->free_count -= s->s_blocksize * 8 - block_r_new;
         /* Extreme case where last bitmap is the only valid block in itself. */
-        if (!SB_AP_BITMAP(s)[bmap_nr_new - 1].free_count)
-                SB_AP_BITMAP(s)[bmap_nr_new - 1].first_zero_hint = 0;
+        if (!info->free_count)
+                info->first_zero_hint = 0;
         /* update super */
         reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
         free_blocks = SB_FREE_BLOCKS(s);