[PATCH 2/3] xfs_io: add inode -l argument to return largest inode number

[Carlos Maiolino]

Implements '-l' argument in inode command, returning to the user, the largest
inode allocated and used in the filesystem.

Signed-off-by: Carlos Maiolino <cmaiolino at redhat.com>
---
 io/open.c | 18 +++++++++++++-----
 1 file changed, 13 insertions(+), 5 deletions(-)

diff --git a/io/open.c b/io/open.c
index 6a794ba..57ff0bf 100644
--- a/io/open.c
+++ b/io/open.c
@@ -759,6 +759,7 @@ inode_help(void)
 "\n"
 "Query physical information about the inode"
 "\n"
+" -l	-- Returns the largest inode number in the filesystem\n"
 " -s	-- Returns the physical size (in bits) of the\n"
 "	   largest inode number in the filesystem\n"
 "\n"));
@@ -777,23 +778,27 @@ inode_f(
 	struct xfs_fsop_bulkreq	bulkreq;
 	int			c;
 	int			ret_lsize = 0;
+	int			ret_largest = 0;
 
 	bulkreq.lastip = &last;
 	bulkreq.icount = 1024; /* maybe an user-defined value!? */
 	bulkreq.ubuffer = &igroup;
 	bulkreq.ocount = &count;
 
-	while ((c = getopt(argc, argv, "s")) != EOF) {
+	while ((c = getopt(argc, argv, "sl")) != EOF) {
 		switch (c) {
 		case 's':
 			ret_lsize = 1;
 			break;
+		case 'l':
+			ret_largest = 1;
+			break;
 		default:
 			return command_usage(&inode_cmd);
 		}
 	}
 
-	if (ret_lsize) {
+	if (ret_lsize || ret_largest) {
 		for (;;) {
 			if (xfsctl(file->name, file->fd, XFS_IOC_FSINUMBERS,
 					&bulkreq)) {
@@ -811,8 +816,11 @@ inode_f(
 		lastino = igroup[lastgrp].xi_startino +
 			  xfs_highbit64(igroup[lastgrp].xi_allocmask);
 
-		printf (_("Largest inode size: %d\n"),
-			 lastino > XFS_MAXINUMBER_32 ? 64 : 32);
+		if (ret_lsize)
+			printf (_("Largest inode size: %d\n"),
+				lastino > XFS_MAXINUMBER_32 ? 64 : 32);
+		else
+			printf(_("Largest inode: %llu\n"), lastino);
 
 	}
 
@@ -887,7 +895,7 @@ open_init(void)
 
 	inode_cmd.name = "inode";
 	inode_cmd.cfunc = inode_f;
-	inode_cmd.args = _("[-s]");
+	inode_cmd.args = _("[-s | -l]");
 	inode_cmd.argmin = 1;
 	inode_cmd.argmax = 1;
 	inode_cmd.flags = CMD_NOMAP_OK;
-- 
2.4.3