smb3: fill in statfs fsid and correct namelen

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>
CC: Stable <stable@vger.kernel.org>
Reviewed-by: Aurelien Aptel <aaptel@suse.com>

diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
index d5aa7ae..69ec542 100644 (file)
--- a/fs/cifs/cifsfs.c
+++ b/fs/cifs/cifsfs.c
@@ -209,14 +209,16 @@ cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
 
        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;
+
+       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);
+
        buf->f_files = 0;       /* undefined */
        buf->f_ffree = 0;       /* unlimited */
 

diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
index ae64cbe..09506d9 100644 (file)
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -549,6 +549,8 @@ smb3_qfs_tcon(const unsigned int xid, struct cifs_tcon *tcon)
        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 */
        if (no_cached_open)
                SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);

diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
index 641fe79..6852ff5 100644 (file)
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -4045,6 +4045,9 @@ SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
        } 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;
@@ -4089,6 +4092,11 @@ SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
                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:

diff --git a/fs/cifs/smb2pdu.h b/fs/cifs/smb2pdu.h
index a671adc..c2a4526 100644 (file)
--- a/fs/cifs/smb2pdu.h
+++ b/fs/cifs/smb2pdu.h
@@ -1248,6 +1248,17 @@ 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