dump.f2fs: add -I nid to dump inode by scan full disk

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>
Reviewed-by: Chao Yu <chao@kernel.org>
[Jaegeuk Kim: fix build error]
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

4 files changed, 55 insertions, 1 deletions

diff --git a/fsck/dump.c b/fsck/dump.c
index fce86c9..b8f6144 100644
--- a/fsck/dump.c
+++ b/fsck/dump.c
@@ -539,6 +539,39 @@ 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;
+	int ret;
+	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++) {
+		struct seg_entry *se = get_seg_entry(sbi, GET_SEGNO(sbi, blkaddr));
+		if (se->type < CURSEG_HOT_NODE)
+			continue;
+
+		ret = dev_read_block(node_blk, blkaddr);
+		ASSERT(ret >= 0);
+		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", (u32)(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..8234986 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);
@@ -270,6 +271,7 @@ extern void ssa_dump(struct f2fs_sb_info *, int, int);
 extern int dump_node(struct f2fs_sb_info *, nid_t, int);
 extern int dump_info_from_blkaddr(struct f2fs_sb_info *, u32);
 extern unsigned int start_bidx_of_node(unsigned int, struct f2fs_node *);
+extern void dump_node_scan_disk(struct f2fs_sb_info *sbi, nid_t nid);
 
 
 /* defrag.c */
diff --git a/fsck/main.c b/fsck/main.c
index aef797e..83c7676 100644
--- a/fsck/main.c
+++ b/fsck/main.c
@@ -90,6 +90,7 @@ 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");
@@ -380,7 +381,7 @@ 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,
@@ -390,6 +391,7 @@ void f2fs_parse_options(int argc, char *argv[])
 			.start_ssa = -1,
 			.end_ssa = -1,
 			.blk_addr = -1,
+			.scan_nid = 0,
 		};
 
 		c.func = DUMP;
@@ -422,6 +424,14 @@ 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,
@@ -914,6 +924,8 @@ 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);
 
diff --git a/man/dump.f2fs.8 b/man/dump.f2fs.8
index 1ddb7fc..94bf5f3 100644
--- a/man/dump.f2fs.8
+++ b/man/dump.f2fs.8
@@ -10,6 +10,10 @@ dump.f2fs \- retrieve directory and file entries from an F2FS-formated image
 .I inode number
 ]
 [
+.B \-I
+.I inode number
+]
+[
 .B \-n
 .I NAT range
 ]
@@ -52,6 +56,9 @@ is 0 on success and -1 on failure.
 .BI \-i " inode number"
 Specify an inode number to dump out.
 .TP
+.BI \-I " inode number"
+Specify an inode number and scan full disk to dump out, include history inode block
+.TP
 .BI \-n " NAT range"
 Specify a range presented by nids to dump NAT entries.
 .TP