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Merge branch 'for-next' of git://git.samba.org/sfrench/cifs-2.6

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Pull cifs version warning fix from Steve French:
 "As requested, additional kernel warning messages to clarify the
  default dialect changes"

[ There is still some discussion about exactly which version should be
  the new default.  Longer-term we have auto-negotiation coming, but
  that's not there yet..  - Linus ]

* 'for-next' of git://git.samba.org/sfrench/cifs-2.6:
  Fix warning messages when mounting to older servers
This commit is contained in:
Linus Torvalds 2017-09-01 20:57:27 -07:00
commit d0d6ab53c9
2 changed files with 27 additions and 2 deletions
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22
fs/cifs/connect.c
View File

@ -1223,6 +1223,7 @@ cifs_parse_mount_options(const char *mountdata, const char *devname,
char *tmp_end, *value;
char delim;
bool got_ip = false;
bool got_version = false;
unsigned short port = 0;
struct sockaddr *dstaddr = (struct sockaddr *)&vol->dstaddr;
@ -1874,24 +1875,35 @@ cifs_parse_mount_options(const char *mountdata, const char *devname,
pr_warn("CIFS: server netbiosname longer than 15 truncated.\n");
break;
case Opt_ver:
/* version of mount userspace tools, not dialect */
string = match_strdup(args);
if (string == NULL)
goto out_nomem;
/* If interface changes in mount.cifs bump to new ver */
if (strncasecmp(string, "1", 1) == 0) {
if (strlen(string) > 1) {
pr_warn("Bad mount helper ver=%s. Did "
"you want SMB1 (CIFS) dialect "
"and mean to type vers=1.0 "
"instead?\n", string);
goto cifs_parse_mount_err;
}
/* This is the default */
break;
}
/* For all other value, error */
pr_warn("CIFS: Invalid version specified\n");
pr_warn("CIFS: Invalid mount helper version specified\n");
goto cifs_parse_mount_err;
case Opt_vers:
/* protocol version (dialect) */
string = match_strdup(args);
if (string == NULL)
goto out_nomem;
if (cifs_parse_smb_version(string, vol) != 0)
goto cifs_parse_mount_err;
got_version = true;
break;
case Opt_sec:
string = match_strdup(args);
@ -1973,6 +1985,14 @@ cifs_parse_mount_options(const char *mountdata, const char *devname,
else if (override_gid == 1)
pr_notice("CIFS: ignoring forcegid mount option specified with no gid= option.\n");
if (got_version == false)
pr_warn("No dialect specified on mount. Default has changed to "
"a more secure dialect, SMB3 (vers=3.0), from CIFS "
"(SMB1). To use the less secure SMB1 dialect to access "
"old servers which do not support SMB3 specify vers=1.0"
" on mount. For somewhat newer servers such as Windows "
"7 try vers=2.1.\n");
kfree(mountdata_copy);
return 0;

7
fs/cifs/smb2pdu.c
View File

@ -514,7 +514,12 @@ SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
* No tcon so can't do
* cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
*/
if (rc != 0)
if (rc == -EOPNOTSUPP) {
cifs_dbg(VFS, "Dialect not supported by server. Consider "
"specifying vers=1.0 or vers=2.1 on mount for accessing"
" older servers\n");
goto neg_exit;
} else if (rc != 0)
goto neg_exit;
cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);