[PATCH 3.16 116/328] smb3: fill in statfs fsid and correct namelen

Ben Hutchings
2018-12-09T22:16:44Z

From: Steve French <stfrench@microsoft.com>

commit 21ba3845b59c733a79ed4fe1c4f3732e7ece9df7 upstream.

Fil in the correct namelen (typically 255 not 4096) in the
statfs response and also fill in a reasonably unique fsid
(in this case taken from the volume id, and the creation time
of the volume).

In the case of the POSIX statfs all fields are now filled in,
and in the case of non-POSIX mounts, all fields are filled
in which can be.

Signed-off-by: Steve French <stfrench@gmail.com>
Reviewed-by: Aurelien Aptel <aaptel@suse.com>
[bwh: Backported to 3.16: Only use cifs_tcon::vol_{serial_number,create_time}
if CONFIG_CIFS_SMB2 is enabled]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
fs/cifs/cifsfs.c | 18 ++++++++++--------
fs/cifs/smb2ops.c | 2 ++
fs/cifs/smb2pdu.c | 8 ++++++++
fs/cifs/smb2pdu.h | 11 +++++++++++
4 files changed, 31 insertions(+), 8 deletions(-)

--- a/fs/cifs/cifsfs.c
+++ b/fs/cifs/cifsfs.c
@@ -190,14 +190,18 @@ cifs_statfs(struct dentry *dentry, struc

xid = get_xid();

- /*
- * PATH_MAX may be too long - it would presumably be total path,
- * but note that some servers (includinng Samba 3) have a shorter
- * maximum path.
- *
- * Instead could get the real value via SMB_QUERY_FS_ATTRIBUTE_INFO.
- */
- buf->f_namelen = PATH_MAX;
+ if (le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength) > 0)
+ buf->f_namelen =
+ le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength);
+ else
+ buf->f_namelen = PATH_MAX;
+
+#ifdef CONFIG_CIFS_SMB2
+ buf->f_fsid.val[0] = tcon->vol_serial_number;
+ /* are using part of create time for more randomness, see man statfs */
+ buf->f_fsid.val[1] = (int)le64_to_cpu(tcon->vol_create_time);
+#endif
+
buf->f_files = 0; /* undefined */
buf->f_ffree = 0; /* unlimited */

--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -263,6 +263,8 @@ smb3_qfs_tcon(const unsigned int xid, st
SMB2_QFS_attr(xid, tcon, fid.persistent_fid, fid.volatile_fid,
FS_DEVICE_INFORMATION);
SMB2_QFS_attr(xid, tcon, fid.persistent_fid, fid.volatile_fid,
+ FS_VOLUME_INFORMATION);
+ SMB2_QFS_attr(xid, tcon, fid.persistent_fid, fid.volatile_fid,
FS_SECTOR_SIZE_INFORMATION); /* SMB3 specific */
SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
return;
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -2614,6 +2614,9 @@ SMB2_QFS_attr(const unsigned int xid, st
} else if (level == FS_SECTOR_SIZE_INFORMATION) {
max_len = sizeof(struct smb3_fs_ss_info);
min_len = sizeof(struct smb3_fs_ss_info);
+ } else if (level == FS_VOLUME_INFORMATION) {
+ max_len = sizeof(struct smb3_fs_vol_info) + MAX_VOL_LABEL_LEN;
+ min_len = sizeof(struct smb3_fs_vol_info);
} else {
cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
return -EINVAL;
@@ -2650,6 +2653,11 @@ SMB2_QFS_attr(const unsigned int xid, st
tcon->ss_flags = le32_to_cpu(ss_info->Flags);
tcon->perf_sector_size =
le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf);
+ } else if (level == FS_VOLUME_INFORMATION) {
+ struct smb3_fs_vol_info *vol_info = (struct smb3_fs_vol_info *)
+ (offset + (char *)rsp);
+ tcon->vol_serial_number = vol_info->VolumeSerialNumber;
+ tcon->vol_create_time = vol_info->VolumeCreationTime;
}

qfsattr_exit:
--- a/fs/cifs/smb2pdu.h
+++ b/fs/cifs/smb2pdu.h
@@ -946,6 +946,17 @@ struct smb3_fs_ss_info {
__le32 ByteOffsetForPartitionAlignment;
} __packed;

+/* volume info struct - see MS-FSCC 2.5.9 */
+#define MAX_VOL_LABEL_LEN 32
+struct smb3_fs_vol_info {
+ __le64 VolumeCreationTime;
+ __u32 VolumeSerialNumber;
+ __le32 VolumeLabelLength; /* includes trailing null */
+ __u8 SupportsObjects; /* True if eg like NTFS, supports objects */
+ __u8 Reserved;
+ __u8 VolumeLabel[0]; /* variable len */
+} __packed;
+
/* partial list of QUERY INFO levels */
#define FILE_DIRECTORY_INFORMATION 1
#define FILE_FULL_DIRECTORY_INFORMATION 2