[PATCH 1/3] xfs_io: Add inode '-s' command to query physical size of largest inode

[Carlos Maiolino <cmaiolino@xxxxxxxxxx>]

Add a new inode command to xfs_io, which aims to implement a tool for query
information about inode usage of the filesystem.

This patch implements '-s' inode option, which query the filesystem for the
physical size of the largest filesystem inode

Signed-off-by: Carlos Maiolino <cmaiolino@xxxxxxxxxx>
---
 io/open.c | 81 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 81 insertions(+)

diff --git a/io/open.c b/io/open.c
index ac5a5e0..6a794ba 100644
--- a/io/open.c
+++ b/io/open.c
@@ -20,6 +20,7 @@
 #include "input.h"
 #include "init.h"
 #include "io.h"
+#include "libxfs.h"
 
 #ifndef __O_TMPFILE
 #if defined __alpha__
@@ -44,6 +45,7 @@ static cmdinfo_t statfs_cmd;
 static cmdinfo_t chproj_cmd;
 static cmdinfo_t lsproj_cmd;
 static cmdinfo_t extsize_cmd;
+static cmdinfo_t inode_cmd;
 static prid_t prid;
 static long extsize;
 
@@ -750,6 +752,74 @@ statfs_f(
 	return 0;
 }
 
+static void
+inode_help(void)
+{
+	printf(_(
+"\n"
+"Query physical information about the inode"
+"\n"
+" -s	-- Returns the physical size (in bits) of the\n"
+"	   largest inode number in the filesystem\n"
+"\n"));
+}
+
+static int
+inode_f(
+	  int			argc,
+	  char			**argv)
+{
+	__s32			count = 0;
+	__s32			lastgrp = 0;
+	__u64			last = 0;
+	__u64			lastino = 0;
+	struct xfs_inogrp	igroup[1024];
+	struct xfs_fsop_bulkreq	bulkreq;
+	int			c;
+	int			ret_lsize = 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) {
+		switch (c) {
+		case 's':
+			ret_lsize = 1;
+			break;
+		default:
+			return command_usage(&inode_cmd);
+		}
+	}
+
+	if (ret_lsize) {
+		for (;;) {
+			if (xfsctl(file->name, file->fd, XFS_IOC_FSINUMBERS,
+					&bulkreq)) {
+				perror("XFS_IOC_FSINUMBERS");
+				exitcode = 1;
+				return 0;
+			}
+			if (count < XFS_INODES_PER_CHUNK && count > 0)
+				lastgrp = count;
+			if (!count)
+				break;
+		}
+
+		lastgrp--;
+		lastino = igroup[lastgrp].xi_startino +
+			  xfs_highbit64(igroup[lastgrp].xi_allocmask);
+
+		printf (_("Largest inode size: %d\n"),
+			 lastino > XFS_MAXINUMBER_32 ? 64 : 32);
+
+	}
+
+
+	return 0;
+}
+
 void
 open_init(void)
 {
@@ -815,6 +885,16 @@ open_init(void)
 		_("get/set preferred extent size (in bytes) for the open file");
 	extsize_cmd.help = extsize_help;
 
+	inode_cmd.name = "inode";
+	inode_cmd.cfunc = inode_f;
+	inode_cmd.args = _("[-s]");
+	inode_cmd.argmin = 1;
+	inode_cmd.argmax = 1;
+	inode_cmd.flags = CMD_NOMAP_OK;
+	inode_cmd.oneline =
+		_("Query inode number usage in the filesystem");
+	inode_cmd.help = inode_help;
+
 	add_command(&open_cmd);
 	add_command(&stat_cmd);
 	add_command(&close_cmd);
@@ -822,4 +902,5 @@ open_init(void)
 	add_command(&chproj_cmd);
 	add_command(&lsproj_cmd);
 	add_command(&extsize_cmd);
+	add_command(&inode_cmd);
 }
-- 
2.4.3

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