From: Darrick J. Wong <djwong@xxxxxxxxxx>
Enable users to print the sysfs or debugfs path for the filesystems
backing the open files.
Signed-off-by: Darrick J. Wong <djwong@xxxxxxxxxx>
---
io/fsuuid.c | 68 +++++++++++++++++++++++++++++++++++++++++++++++++++++
man/man8/xfs_io.8 | 7 +++++
2 files changed, 75 insertions(+)
diff --git a/io/fsuuid.c b/io/fsuuid.c
index af2f87a20209..8e50ec14c8fd 100644
--- a/io/fsuuid.c
+++ b/io/fsuuid.c
@@ -12,6 +12,7 @@
#include "libfrog/logging.h"
static cmdinfo_t fsuuid_cmd;
+static cmdinfo_t sysfspath_cmd;
static int
fsuuid_f(
@@ -35,6 +36,62 @@ fsuuid_f(
return 0;
}
+#ifndef FS_IOC_GETFSSYSFSPATH
+struct fs_sysfs_path {
+ __u8 len;
+ __u8 name[128];
+};
+#define FS_IOC_GETFSSYSFSPATH _IOR(0x15, 1, struct fs_sysfs_path)
+#endif
+
+static void
+sysfspath_help(void)
+{
+ printf(_(
+"\n"
+" print the sysfs path for the open file\n"
+"\n"
+" Prints the path in sysfs where one might find information about the\n"
+" filesystem backing the open files. The path is not required to exist.\n"
+" -d -- return the path in debugfs, if any\n"
+"\n"));
+}
+
+static int
+sysfspath_f(
+ int argc,
+ char **argv)
+{
+ struct fs_sysfs_path path;
+ bool debugfs = false;
+ int c;
+ int ret;
+
+ while ((c = getopt(argc, argv, "d")) != EOF) {
+ switch (c) {
+ case 'd':
+ debugfs = true;
+ break;
+ default:
+ exitcode = 1;
+ return command_usage(&sysfspath_cmd);
+ }
+ }
+
+ ret = ioctl(file->fd, FS_IOC_GETFSSYSFSPATH, &path);
+ if (ret) {
+ xfrog_perror(ret, "FS_IOC_GETSYSFSPATH");
+ exitcode = 1;
+ return 0;
+ }
+
+ if (debugfs)
+ printf("/sys/kernel/debug/%.*s\n", path.len, path.name);
+ else
+ printf("/sys/fs/%.*s\n", path.len, path.name);
+ return 0;
+}
+
void
fsuuid_init(void)
{
@@ -46,4 +103,15 @@ fsuuid_init(void)
fsuuid_cmd.oneline = _("get mounted filesystem UUID");
add_command(&fsuuid_cmd);
+
+ sysfspath_cmd.name = "sysfspath";
+ sysfspath_cmd.cfunc = sysfspath_f;
+ sysfspath_cmd.argmin = 0;
+ sysfspath_cmd.argmax = -1;
+ sysfspath_cmd.args = _("-d");
+ sysfspath_cmd.flags = CMD_NOMAP_OK | CMD_FLAG_FOREIGN_OK;
+ sysfspath_cmd.oneline = _("get mounted filesystem sysfs path");
+ sysfspath_cmd.help = sysfspath_help;
+
+ add_command(&sysfspath_cmd);
}
diff --git a/man/man8/xfs_io.8 b/man/man8/xfs_io.8
index 56abe000f235..3ce280a75b4a 100644
--- a/man/man8/xfs_io.8
+++ b/man/man8/xfs_io.8
@@ -1464,6 +1464,13 @@ flag.
.TP
.B fsuuid
Print the mounted filesystem UUID.
+.TP
+.B sysfspath
+Print the sysfs or debugfs path for the mounted filesystem.
+
+The
+.B -d
+option selects debugfs instead of sysfs.
.SH OTHER COMMANDS
