[PATCH v2] f2fs: fix max orphan inodes calculation

[Wanpeng Li <wanpeng.li@linux.intel.com>]

cp_payload is introduced for sit bitmap to support large volume, and it is
just after the block of f2fs_checkpoint + nat bitmap, so the first segment
should include F2FS_CP_PACKS + NR_CURSEG_TYPE + cp_payload + orphan blocks.
However, current max orphan inodes calculation don't consider cp_payload,
this patch fix it by reducing the number of cp_payload from total blocks of
the first segment when calculate max orphan inodes.

Signed-off-by: Wanpeng Li <wanpeng.li@linux.intel.com>
---
v1 -> v2:
 * adjust comments above the codes 
 * fix coding style issue

 fs/f2fs/checkpoint.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
index db82e09..a914e99 100644
--- a/fs/f2fs/checkpoint.c
+++ b/fs/f2fs/checkpoint.c
@@ -1103,13 +1103,15 @@ void init_ino_entry_info(struct f2fs_sb_info *sbi)
 	}
 
 	/*
-	 * considering 512 blocks in a segment 8 blocks are needed for cp
-	 * and log segment summaries. Remaining blocks are used to keep
-	 * orphan entries with the limitation one reserved segment
-	 * for cp pack we can have max 1020*504 orphan entries
+	 * considering 512 blocks in a segment 8+cp_payload blocks are
+	 * needed for cp and log segment summaries. Remaining blocks are
+	 * used to keep orphan entries with the limitation one reserved
+	 * segment for cp pack we can have max 1020*(504-cp_payload)
+	 * orphan entries
 	 */
 	sbi->max_orphans = (sbi->blocks_per_seg - F2FS_CP_PACKS -
-			NR_CURSEG_TYPE) * F2FS_ORPHANS_PER_BLOCK;
+			NR_CURSEG_TYPE - __cp_payload(sbi)) *
+				F2FS_ORPHANS_PER_BLOCK;
 }
 
 int __init create_checkpoint_caches(void)
-- 
1.9.1