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Date: Wed, 28 Sep 2016 02:32:57 +0800 (CST)
From: "Tiezhu Yang" <kernelpatch@....com>
To: jaegeuk@...nel.org, yuchao0@...wei.com
Cc: linux-f2fs-devel@...ts.sourceforge.net,
linux-kernel@...r.kernel.org
Subject: [PATCH v3] f2fs: introduce get_checkpoint_version for cleanup
There exists almost same codes when get the value of pre_version
and cur_version in function validate_checkpoint, this patch adds
get_checkpoint_version to clean up redundant codes.
Signed-off-by: Tiezhu Yang <kernelpatch@....com>
---
fs/f2fs/checkpoint.c | 68 ++++++++++++++++++++++++++++++----------------------
1 file changed, 40 insertions(+), 28 deletions(-)
diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
index de8693c..06992a7 100644
--- a/fs/f2fs/checkpoint.c
+++ b/fs/f2fs/checkpoint.c
@@ -663,45 +663,57 @@ static void write_orphan_inodes(struct f2fs_sb_info *sbi, block_t start_blk)
}
}
-static struct page *validate_checkpoint(struct f2fs_sb_info *sbi,
- block_t cp_addr, unsigned long long *version)
+static int get_checkpoint_version(struct f2fs_sb_info *sbi, block_t cp_addr,
+ struct f2fs_checkpoint **cp_block, struct page **cp_page,
+ unsigned long long *version)
{
- struct page *cp_page_1, *cp_page_2 = NULL;
unsigned long blk_size = sbi->blocksize;
- struct f2fs_checkpoint *cp_block;
- unsigned long long cur_version = 0, pre_version = 0;
- size_t crc_offset;
+ size_t crc_offset = 0;
__u32 crc = 0;
- /* Read the 1st cp block in this CP pack */
- cp_page_1 = get_meta_page(sbi, cp_addr);
+ *cp_page = get_meta_page(sbi, cp_addr);
+ *cp_block = (struct f2fs_checkpoint *)page_address(*cp_page);
- /* get the version number */
- cp_block = (struct f2fs_checkpoint *)page_address(cp_page_1);
- crc_offset = le32_to_cpu(cp_block->checksum_offset);
- if (crc_offset >= blk_size)
- goto invalid_cp1;
+ crc_offset = le32_to_cpu((*cp_block)->checksum_offset);
+ if (crc_offset >= blk_size) {
+ f2fs_msg(sbi->sb, KERN_WARNING,
+ "%s: crc_offset is greater than or equal to blk_size.",
+ __func__);
+ return -EINVAL;
+ }
- crc = le32_to_cpu(*((__le32 *)((unsigned char *)cp_block + crc_offset)));
- if (!f2fs_crc_valid(sbi, crc, cp_block, crc_offset))
- goto invalid_cp1;
+ crc = le32_to_cpu(*((__le32 *)((unsigned char *)*cp_block
+ + crc_offset)));
+ if (!f2fs_crc_valid(sbi, crc, *cp_block, crc_offset)) {
+ f2fs_msg(sbi->sb, KERN_WARNING,
+ "%s: f2fs_crc_valid returns false.", __func__);
+ return -EINVAL;
+ }
- pre_version = cur_cp_version(cp_block);
+ *version = cur_cp_version(*cp_block);
+ return 0;
+}
- /* Read the 2nd cp block in this CP pack */
- cp_addr += le32_to_cpu(cp_block->cp_pack_total_block_count) - 1;
- cp_page_2 = get_meta_page(sbi, cp_addr);
+static struct page *validate_checkpoint(struct f2fs_sb_info *sbi,
+ block_t cp_addr, unsigned long long *version)
+{
+ struct page *cp_page_1 = NULL, *cp_page_2 = NULL;
+ struct f2fs_checkpoint *cp_block = NULL;
+ unsigned long long cur_version = 0, pre_version = 0;
+ int err;
- cp_block = (struct f2fs_checkpoint *)page_address(cp_page_2);
- crc_offset = le32_to_cpu(cp_block->checksum_offset);
- if (crc_offset >= blk_size)
- goto invalid_cp2;
+ err = get_checkpoint_version(sbi, cp_addr, &cp_block,
+ &cp_page_1, version);
+ if (err)
+ goto invalid_cp1;
+ pre_version = *version;
- crc = le32_to_cpu(*((__le32 *)((unsigned char *)cp_block + crc_offset)));
- if (!f2fs_crc_valid(sbi, crc, cp_block, crc_offset))
+ cp_addr += le32_to_cpu(cp_block->cp_pack_total_block_count) - 1;
+ err = get_checkpoint_version(sbi, cp_addr, &cp_block,
+ &cp_page_2, version);
+ if (err)
goto invalid_cp2;
-
- cur_version = cur_cp_version(cp_block);
+ cur_version = *version;
if (cur_version == pre_version) {
*version = cur_version;
--
1.8.3.1
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