debugfs: add a new debugfs command 'blocks'

The blocks command prints out the blocks used by a particular inode,
in a format which is useful for test suite automation.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

4 files changed, 37 insertions, 0 deletions

diff --git a/debugfs/debug_cmds.ct b/debugfs/debug_cmds.ct
index 9b6c985a..4e9e8310 100644
--- a/debugfs/debug_cmds.ct
+++ b/debugfs/debug_cmds.ct
@@ -46,6 +46,9 @@ request do_stat, "Show inode information ",
 request do_dump_extents, "Dump extents information ",
 	dump_extents, extents, ex;
 
+request do_blocks, "Dump blocks used by an inode ",
+	blocks;
+
 request do_link, "Create directory link",
 	link, ln;
 
diff --git a/debugfs/debugfs.8.in b/debugfs/debugfs.8.in
index f5deb7ac..fe07f347 100644
--- a/debugfs/debugfs.8.in
+++ b/debugfs/debugfs.8.in
@@ -157,6 +157,11 @@ This is a list of the commands which
 .B debugfs
 supports.
 .TP
+.I blocks filespace
+Print the blocks used by the inode
+.I filespec
+to stdout.
+.TP
 .I bmap filespec logical_block
 Print the physical block number corresponding to the logical block number
 .I logical_block
diff --git a/debugfs/debugfs.c b/debugfs/debugfs.c
index 12ee638a..e7d74363 100644
--- a/debugfs/debugfs.c
+++ b/debugfs/debugfs.c
@@ -912,6 +912,34 @@ void do_dump_extents(int argc, char **argv)
 	return;
 }
 
+static int print_blocks_proc(ext2_filsys fs EXT2FS_ATTR((unused)),
+			     blk64_t *blocknr,
+			     e2_blkcnt_t blockcnt,
+			     blk64_t ref_block EXT2FS_ATTR((unused)),
+			     int ref_offset EXT2FS_ATTR((unused)),
+			     void *private EXT2FS_ATTR((unused)))
+{
+	printf("%llu ", *blocknr);
+	return 0;
+}
+
+void do_blocks(int argc, char *argv[])
+{
+	ext2_ino_t	inode;
+
+	if (check_fs_open(argv[0]))
+		return;
+
+	if (common_inode_args_process(argc, argv, &inode, 0)) {
+		return;
+	}
+
+	ext2fs_block_iterate3(current_fs, inode, BLOCK_FLAG_READ_ONLY, NULL,
+			      print_blocks_proc, NULL);
+	fputc('\n', stdout);
+	return;
+}
+
 void do_chroot(int argc, char *argv[])
 {
 	ext2_ino_t inode;
diff --git a/debugfs/debugfs.h b/debugfs/debugfs.h
index f7ec8da9..0ea24748 100644
--- a/debugfs/debugfs.h
+++ b/debugfs/debugfs.h
@@ -104,6 +104,7 @@ extern void do_find_free_block(int argc, char **argv);
 extern void do_find_free_inode(int argc, char **argv);
 extern void do_stat(int argc, char **argv);
 extern void do_dump_extents(int argc, char **argv);
+extern void do_blocks(int argc, char *argv[]);
 
 extern void do_chroot(int argc, char **argv);
 extern void do_clri(int argc, char **argv);