On Sun, Jun 02, 2024 at 04:29:49PM GMT, Darrick J. Wong wrote:
> 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>
Reviewed-by: Carlos Maiolino <cmaiolino@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
>
