[f2fs-dev] [PATCH] dump.f2fs: add -I nid to dump inode by scan full disk

[Yufen Yu via Linux-f2fs-devel <linux-f2fs-devel@lists.sourceforge.net>]

Usage:
	dump.f2fs -I [inode nid] /dev/sda

This feature can be useful for some bugs caused by system crash.
We not only need dump current valid node page, but alse the history
data in disk, which can give some clues for status change of the inode.

Signed-off-by: Yufen Yu <yuyufen@huawei.com>
---
 fsck/dump.c | 27 +++++++++++++++++++++++++++
 fsck/fsck.h |  1 +
 fsck/main.c | 14 +++++++++++++-
 3 files changed, 41 insertions(+), 1 deletion(-)

diff --git a/fsck/dump.c b/fsck/dump.c
index fce86c9..8fab602 100644
--- a/fsck/dump.c
+++ b/fsck/dump.c
@@ -539,6 +539,33 @@ static bool is_sit_bitmap_set(struct f2fs_sb_info *sbi, u32 blk_addr)
 			(const char *)se->cur_valid_map) != 0;
 }
 
+void dump_node_scan_disk(struct f2fs_sb_info *sbi, nid_t nid)
+{
+	struct f2fs_node *node_blk;
+	pgoff_t blkaddr;
+	pgoff_t start_blkaddr = SM_I(sbi)->main_blkaddr;
+	pgoff_t end_blkaddr = start_blkaddr +
+		SM_I(sbi)->main_segments << sbi->log_blocks_per_seg;
+
+	node_blk = calloc(BLOCK_SZ, 1);
+	ASSERT(node_blk);
+	MSG(0, "Info: scan all nid: %u from block_addr [%lu: %lu]\n",
+			nid, start_blkaddr, end_blkaddr);
+
+	for (blkaddr = start_blkaddr; blkaddr < end_blkaddr; blkaddr++) {
+		dev_read_block(node_blk, blkaddr);
+		if (le32_to_cpu(node_blk->footer.ino) != nid ||
+				le32_to_cpu(node_blk->footer.nid) != nid)
+			continue;
+		MSG(0, "Info: nid: %u, blkaddr: %lu\n", nid, blkaddr);
+		MSG(0, "node_blk.footer.flag [0x%x]\n", le32_to_cpu(node_blk->footer.flag));
+		MSG(0, "node_blk.footer.cp_ver [%x]\n", cpver_of_node(node_blk));
+		print_inode_info(sbi, node_blk, 0);
+	}
+
+	free(node_blk);
+}
+
 int dump_node(struct f2fs_sb_info *sbi, nid_t nid, int force)
 {
 	struct node_info ni;
diff --git a/fsck/fsck.h b/fsck/fsck.h
index ce5fffe..0c819f0 100644
--- a/fsck/fsck.h
+++ b/fsck/fsck.h
@@ -262,6 +262,7 @@ struct dump_option {
 	int start_ssa;
 	int end_ssa;
 	int32_t blk_addr;
+	nid_t scan_nid;
 };
 
 extern void nat_dump(struct f2fs_sb_info *, nid_t, nid_t);
diff --git a/fsck/main.c b/fsck/main.c
index e4cfdf4..c7ad5ad 100644
--- a/fsck/main.c
+++ b/fsck/main.c
@@ -93,6 +93,7 @@ void dump_usage()
 	MSG(0, "[options]:\n");
 	MSG(0, "  -d debug level [default:0]\n");
 	MSG(0, "  -i inode no (hex)\n");
+	MSG(0, "  -I inode no (hex) scan full disk\n");
 	MSG(0, "  -n [NAT dump nid from #1~#2 (decimal), for all 0~-1]\n");
 	MSG(0, "  -M show a block map\n");
 	MSG(0, "  -s [SIT dump segno from #1~#2 (decimal), for all 0~-1]\n");
@@ -382,7 +383,7 @@ void f2fs_parse_options(int argc, char *argv[])
 		}
 	} else if (!strcmp("dump.f2fs", prog)) {
 #ifdef WITH_DUMP
-		const char *option_string = "d:i:n:Ms:Sa:b:V";
+		const char *option_string = "d:i:I:n:Ms:Sa:b:V";
 		static struct dump_option dump_opt = {
 			.nid = 0,	/* default root ino */
 			.start_nat = -1,
@@ -392,6 +393,7 @@ void f2fs_parse_options(int argc, char *argv[])
 			.start_ssa = -1,
 			.end_ssa = -1,
 			.blk_addr = -1,
+			.scan_nid = 0,
 		};
 
 		c.func = DUMP;
@@ -424,6 +426,14 @@ void f2fs_parse_options(int argc, char *argv[])
 					ret = sscanf(optarg, "%x",
 							&dump_opt.nid);
 				break;
+			case 'I':
+				if (strncmp(optarg, "0x", 2))
+					ret = sscanf(optarg, "%d",
+							&dump_opt.scan_nid);
+				else
+					ret = sscanf(optarg, "%x",
+							&dump_opt.scan_nid);
+				break;
 			case 'n':
 				ret = sscanf(optarg, "%d~%d",
 							&dump_opt.start_nat,
@@ -916,6 +926,8 @@ static void do_dump(struct f2fs_sb_info *sbi)
 		dump_info_from_blkaddr(sbi, opt->blk_addr);
 	if (opt->nid)
 		dump_node(sbi, opt->nid, 0);
+	if (opt->scan_nid)
+		dump_node_scan_disk(sbi, opt->scan_nid);
 
 	print_cp_state(flag);
 
-- 
2.31.1



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