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Add way to query server fs info for smb3

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The server exports information about the share and underlying
device under an SMB3 export, including its attributes and
capabilities, which is stored by cifs.ko when first connecting
to the share.

Add ioctl to cifs.ko to allow user space smb3 helper utilities
(in cifs-utils) to display this (e.g. via smb3util).

This information is also useful for debugging and for
resolving configuration errors.

Signed-off-by: Steve French <steve.french@primarydata.com>
This commit is contained in:
Steve French 2015-07-04 18:40:10 -05:00 committed by Steve French
parent 1b647a166f
commit 0de1f4c6f6
3 changed files with 98 additions and 6 deletions
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42
fs/cifs/cifs_ioctl.h Normal file
View File

@ -0,0 +1,42 @@
/*
* fs/cifs/cifs_ioctl.h
*
* Structure definitions for io control for cifs/smb3
*
* Copyright (c) 2015 Steve French <steve.french@primarydata.com>
*
* This library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
* the GNU Lesser General Public License for more details.
*
*/
struct smb_mnt_fs_info {
__u32 version; /* 0001 */
__u16 protocol_id;
__u16 tcon_flags;
__u32 vol_serial_number;
__u32 vol_create_time;
__u32 share_caps;
__u32 share_flags;
__u32 sector_flags;
__u32 optimal_sector_size;
__u32 max_bytes_chunk;
__u32 fs_attributes;
__u32 max_path_component;
__u32 device_type;
__u32 device_characteristics;
__u32 maximal_access;
__u64 cifs_posix_caps;
} __packed;
#define CIFS_IOCTL_MAGIC 0xCF
#define CIFS_IOC_COPYCHUNK_FILE _IOW(CIFS_IOCTL_MAGIC, 3, int)
#define CIFS_IOC_SET_INTEGRITY _IO(CIFS_IOCTL_MAGIC, 4)
#define CIFS_IOC_GET_MNT_INFO _IOR(CIFS_IOCTL_MAGIC, 5, struct smb_mnt_fs_info)

14
fs/cifs/cifspdu.h
View File

@ -2245,6 +2245,20 @@ typedef struct {
#define FILE_DEVICE_VIRTUAL_DISK 0x00000024
#define FILE_DEVICE_NETWORK_REDIRECTOR 0x00000028
/* Device Characteristics */
#define FILE_REMOVABLE_MEDIA 0x00000001
#define FILE_READ_ONLY_DEVICE 0x00000002
#define FILE_FLOPPY_DISKETTE 0x00000004
#define FILE_WRITE_ONCE_MEDIA 0x00000008
#define FILE_REMOTE_DEVICE 0x00000010
#define FILE_DEVICE_IS_MOUNTED 0x00000020
#define FILE_VIRTUAL_VOLUME 0x00000040
#define FILE_DEVICE_SECURE_OPEN 0x00000100
#define FILE_CHARACTERISTIC_TS_DEVICE 0x00001000
#define FILE_CHARACTERISTIC_WEBDAV_DEVICE 0x00002000
#define FILE_PORTABLE_DEVICE 0x00004000
#define FILE_DEVICE_ALLOW_APPCONTAINER_TRAVERSAL 0x00020000
typedef struct {
__le32 DeviceType;
__le32 DeviceCharacteristics;

48
fs/cifs/ioctl.c
View File

@ -31,12 +31,9 @@
#include "cifsproto.h"
#include "cifs_debug.h"
#include "cifsfs.h"
#include "cifs_ioctl.h"
#include <linux/btrfs.h>
#define CIFS_IOCTL_MAGIC 0xCF
#define CIFS_IOC_COPYCHUNK_FILE _IOW(CIFS_IOCTL_MAGIC, 3, int)
#define CIFS_IOC_SET_INTEGRITY _IO(CIFS_IOCTL_MAGIC, 4)
static long cifs_ioctl_clone(unsigned int xid, struct file *dst_file,
unsigned long srcfd, u64 off, u64 len, u64 destoff,
bool dup_extents)
@ -135,6 +132,43 @@ static long cifs_ioctl_clone(unsigned int xid, struct file *dst_file,
return rc;
}
static long smb_mnt_get_fsinfo(unsigned int xid, struct cifs_tcon *tcon,
void __user *arg)
{
int rc = 0;
struct smb_mnt_fs_info *fsinf;
fsinf = kzalloc(sizeof(struct smb_mnt_fs_info), GFP_KERNEL);
if (fsinf == NULL)
return -ENOMEM;
fsinf->version = 1;
fsinf->protocol_id = tcon->ses->server->vals->protocol_id;
fsinf->device_characteristics =
le32_to_cpu(tcon->fsDevInfo.DeviceCharacteristics);
fsinf->device_type = le32_to_cpu(tcon->fsDevInfo.DeviceType);
fsinf->fs_attributes = le32_to_cpu(tcon->fsAttrInfo.Attributes);
fsinf->max_path_component =
le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength);
#ifdef CONFIG_CIFS_SMB2
fsinf->vol_serial_number = tcon->vol_serial_number;
fsinf->vol_create_time = le64_to_cpu(tcon->vol_create_time);
fsinf->share_flags = tcon->share_flags;
fsinf->share_caps = le32_to_cpu(tcon->capabilities);
fsinf->sector_flags = tcon->ss_flags;
fsinf->optimal_sector_size = tcon->perf_sector_size;
fsinf->max_bytes_chunk = tcon->max_bytes_chunk;
fsinf->maximal_access = tcon->maximal_access;
#endif /* SMB2 */
fsinf->cifs_posix_caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
if (copy_to_user(arg, fsinf, sizeof(struct smb_mnt_fs_info)))
rc = -EFAULT;
kfree(fsinf);
return rc;
}
long cifs_ioctl(struct file *filep, unsigned int command, unsigned long arg)
{
struct inode *inode = file_inode(filep);
@ -148,8 +182,6 @@ long cifs_ioctl(struct file *filep, unsigned int command, unsigned long arg)
xid = get_xid();
cifs_dbg(FYI, "ioctl file %p cmd %u arg %lu\n", filep, command, arg);
cifs_sb = CIFS_SB(inode->i_sb);
switch (command) {
@ -228,6 +260,10 @@ long cifs_ioctl(struct file *filep, unsigned int command, unsigned long arg)
else
rc = -EOPNOTSUPP;
break;
case CIFS_IOC_GET_MNT_INFO:
tcon = tlink_tcon(pSMBFile->tlink);
rc = smb_mnt_get_fsinfo(xid, tcon, (void __user *)arg);
break;
default:
cifs_dbg(FYI, "unsupported ioctl\n");
break;