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cifs: replace /proc/fs/cifs/Experimental with a module parm

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This flag currently only affects whether we allow "zero-copy" writes
with signing enabled. Typically we map pages in the pagecache directly
into the write request. If signing is enabled however and the contents
of the page change after the signature is calculated but before the
write is sent then the signature will be wrong. Servers typically
respond to this by closing down the socket.

Still, this can provide a performance benefit so the "Experimental" flag
was overloaded to allow this. That's really not a good place for this
option however since it's not clear what that flag does.

Move that flag instead to a new module parameter that better describes
its purpose. That's also better since it can be set at module insertion
time by configuring modprobe.d.

Reviewed-by: Suresh Jayaraman <sjayaraman@suse.de>
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
This commit is contained in:
Jeff Layton 2011-02-22 20:17:19 -05:00 committed by Steve French
parent 7797069305
commit bdf1b03e09
5 changed files with 7 additions and 63 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
fs/cifs/README
View File

@ -685,22 +685,6 @@ LinuxExtensionsEnabled If set to one then the client will attempt to
support and want to map the uid and gid fields
to values supplied at mount (rather than the
actual values, then set this to zero. (default 1)
Experimental When set to 1 used to enable certain experimental
features (currently enables multipage writes
when signing is enabled, the multipage write
performance enhancement was disabled when
signing turned on in case buffer was modified
just before it was sent, also this flag will
be used to use the new experimental directory change
notification code). When set to 2 enables
an additional experimental feature, "raw ntlmssp"
session establishment support (which allows
specifying "sec=ntlmssp" on mount). The Linux cifs
module will use ntlmv2 authentication encapsulated
in "raw ntlmssp" (not using SPNEGO) when
"sec=ntlmssp" is specified on mount.
This support also requires building cifs with
the CONFIG_CIFS_EXPERIMENTAL configuration flag.
These experimental features and tracing can be enabled by changing flags in
/proc/fs/cifs (after the cifs module has been installed or built into the

43
fs/cifs/cifs_debug.c
View File

@ -423,7 +423,6 @@ static const struct file_operations cifs_lookup_cache_proc_fops;
static const struct file_operations traceSMB_proc_fops;
static const struct file_operations cifs_multiuser_mount_proc_fops;
static const struct file_operations cifs_security_flags_proc_fops;
static const struct file_operations cifs_experimental_proc_fops;
static const struct file_operations cifs_linux_ext_proc_fops;
void
@ -441,8 +440,6 @@ cifs_proc_init(void)
proc_create("cifsFYI", 0, proc_fs_cifs, &cifsFYI_proc_fops);
proc_create("traceSMB", 0, proc_fs_cifs, &traceSMB_proc_fops);
proc_create("OplockEnabled", 0, proc_fs_cifs, &cifs_oplock_proc_fops);
proc_create("Experimental", 0, proc_fs_cifs,
&cifs_experimental_proc_fops);
proc_create("LinuxExtensionsEnabled", 0, proc_fs_cifs,
&cifs_linux_ext_proc_fops);
proc_create("MultiuserMount", 0, proc_fs_cifs,
@ -469,7 +466,6 @@ cifs_proc_clean(void)
remove_proc_entry("OplockEnabled", proc_fs_cifs);
remove_proc_entry("SecurityFlags", proc_fs_cifs);
remove_proc_entry("LinuxExtensionsEnabled", proc_fs_cifs);
remove_proc_entry("Experimental", proc_fs_cifs);
remove_proc_entry("LookupCacheEnabled", proc_fs_cifs);
remove_proc_entry("fs/cifs", NULL);
}
@ -550,45 +546,6 @@ static const struct file_operations cifs_oplock_proc_fops = {
.write = cifs_oplock_proc_write,
};
static int cifs_experimental_proc_show(struct seq_file *m, void *v)
{
seq_printf(m, "%d\n", experimEnabled);
return 0;
}
static int cifs_experimental_proc_open(struct inode *inode, struct file *file)
{
return single_open(file, cifs_experimental_proc_show, NULL);
}
static ssize_t cifs_experimental_proc_write(struct file *file,
const char __user *buffer, size_t count, loff_t *ppos)
{
char c;
int rc;
rc = get_user(c, buffer);
if (rc)
return rc;
if (c == '0' || c == 'n' || c == 'N')
experimEnabled = 0;
else if (c == '1' || c == 'y' || c == 'Y')
experimEnabled = 1;
else if (c == '2')
experimEnabled = 2;
return count;
}
static const struct file_operations cifs_experimental_proc_fops = {
.owner = THIS_MODULE,
.open = cifs_experimental_proc_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
.write = cifs_experimental_proc_write,
};
static int cifs_linux_ext_proc_show(struct seq_file *m, void *v)
{
seq_printf(m, "%d\n", linuxExtEnabled);

5
fs/cifs/cifsfs.c
View File

@ -53,7 +53,6 @@ int cifsFYI = 0;
int cifsERROR = 1;
int traceSMB = 0;
unsigned int oplockEnabled = 1;
unsigned int experimEnabled = 0;
unsigned int linuxExtEnabled = 1;
unsigned int lookupCacheEnabled = 1;
unsigned int multiuser_mount = 0;
@ -82,6 +81,10 @@ module_param(echo_retries, ushort, 0644);
MODULE_PARM_DESC(echo_retries, "Number of echo attempts before giving up and "
"reconnecting server. Default: 5. 0 means "
"never reconnect.");
bool sign_zero_copy; /* globals init to false automatically */
module_param(sign_zero_copy, bool, 0644);
MODULE_PARM_DESC(sign_zero_copy, "Don't copy pages on write with signing "
"enabled. Default: N");
extern mempool_t *cifs_sm_req_poolp;
extern mempool_t *cifs_req_poolp;
extern mempool_t *cifs_mid_poolp;

2
fs/cifs/cifsglob.h
View File

@ -817,7 +817,6 @@ GLOBAL_EXTERN unsigned int multiuser_mount; /* if enabled allows new sessions
have the uid/password or Kerberos credential
or equivalent for current user */
GLOBAL_EXTERN unsigned int oplockEnabled;
GLOBAL_EXTERN unsigned int experimEnabled;
GLOBAL_EXTERN unsigned int lookupCacheEnabled;
GLOBAL_EXTERN unsigned int global_secflags; /* if on, session setup sent
with more secure ntlmssp2 challenge/resp */
@ -827,6 +826,7 @@ GLOBAL_EXTERN unsigned int CIFSMaxBufSize; /* max size not including hdr */
GLOBAL_EXTERN unsigned int cifs_min_rcv; /* min size of big ntwrk buf pool */
GLOBAL_EXTERN unsigned int cifs_min_small; /* min size of small buf pool */
GLOBAL_EXTERN unsigned int cifs_max_pending; /* MAX requests at once to server*/
GLOBAL_EXTERN bool sign_zero_copy; /* don't copy written pages with signing */
/* reconnect after this many failed echo attempts */
GLOBAL_EXTERN unsigned short echo_retries;

4
fs/cifs/file.c
View File

@ -981,7 +981,7 @@ static ssize_t cifs_write(struct cifsFileInfo *open_file,
if (rc != 0)
break;
}
if (experimEnabled || (pTcon->ses->server &&
if (sign_zero_copy || (pTcon->ses->server &&
((pTcon->ses->server->secMode &
(SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
== 0))) {
@ -1242,7 +1242,7 @@ static int cifs_writepages(struct address_space *mapping,
}
tcon = tlink_tcon(open_file->tlink);
if (!experimEnabled && tcon->ses->server->secMode &
if (!sign_zero_copy && tcon->ses->server->secMode &
(SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) {
cifsFileInfo_put(open_file);
kfree(iov);