Re: [PATCH][smb3 client] allow debugging session and tcon info to improve stats analysis and debugging

[Steve French <smfrench@gmail.com>]

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Attached is a sample program (that uses the new cifs.ko IOCTL) to dump the
tree id for a mount to make it easier to look at traces, wireshark,
/proc/fs/cifs/Stats, /proc/fs/cifs/DebugData if you have more than one
mount (would be useful to add something similar to debugging tools and/or
smb-info or something new in cifs-utils).

e.g.

# ./get-tcon-inf /mnt2
ioctl completed. tid 0x47b3d0e2 session id: 0xf6cde60a

# cat /proc/fs/cifs/DebugData | grep "tid: 0x47b3d0e2" -C3
2) \\localhost\test Mounts: 1 DevInfo: 0x20 Attributes: 0x801007f
PathComponentMax: 255 Status: 1 type: DISK Serial Number: 0xaab31952
Share Capabilities: None Aligned, Partition Aligned, Share Flags: 0x0
tid: 0x47b3d0e2 Optimal sector size: 0x200 Maximal Access: 0x1f01ff
-- 
Thanks,

Steve

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[-- Attachment #2: get-tcon-inf.c --]
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#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <stdbool.h>
#include <fcntl.h>
#include <string.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <unistd.h>


struct __attribute__((__packed__))smb_mnt_tcon_info {
       uint32_t   tid;
       uint64_t   session_id;
} __packed;


#define CIFS_IOC_GET_TCON_INFO 0x800ccf0c
int main(int argc, char **argv)
{
	struct smb_mnt_tcon_info mnt_info;
	int f;

	if ((f = open(argv[1], O_RDONLY)) < 0) {
		fprintf(stderr, "Failed to open %s\n", argv[1]);
		exit(1);
	}

	if (ioctl(f, CIFS_IOC_GET_TCON_INFO, &mnt_info) < 0)
		printf("Error %d returned from ioctl\n", errno);
	else {
		printf("ioctl completed. tid 0x%x session id: 0x%lx\n", mnt_info.tid, mnt_info.session_id);
	}
}