f2fs: support large nat bitmap

Previously, we will store all nat version bitmap in checkpoint pack block,
so our total node entry number has a limitation which caused total node
number can not exceed (3900 * 8) block * 455 node/block = 14196000. So
that once user wants to create more nodes in large size image, it becomes
a bottleneck, that's unreasonable.

This patch detects the new layout of nat/sit version bitmap in image in
order to enable supporting large nat bitmap.

Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 8b652e0..3f4dafe 100644 (file)
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -1762,6 +1762,12 @@ static inline void *__bitmap_ptr(struct f2fs_sb_info *sbi, int flag)
        struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
        int offset;
 
+       if (is_set_ckpt_flags(sbi, CP_LARGE_NAT_BITMAP_FLAG)) {
+               offset = (flag == SIT_BITMAP) ?
+                       le32_to_cpu(ckpt->nat_ver_bitmap_bytesize) : 0;
+               return &ckpt->sit_nat_version_bitmap + offset;
+       }
+
        if (__cp_payload(sbi) > 0) {
                if (flag == NAT_BITMAP)
                        return &ckpt->sit_nat_version_bitmap;

diff --git a/include/linux/f2fs_fs.h b/include/linux/f2fs_fs.h
index 393b880..96c9bdb 100644 (file)
--- a/include/linux/f2fs_fs.h
+++ b/include/linux/f2fs_fs.h
@@ -116,6 +116,7 @@ struct f2fs_super_block {
 /*
  * For checkpoint
  */
+#define CP_LARGE_NAT_BITMAP_FLAG       0x00000400
 #define CP_NOCRC_RECOVERY_FLAG 0x00000200
 #define CP_TRIMMED_FLAG                0x00000100
 #define CP_NAT_BITS_FLAG       0x00000080