Commit bdf1b03e authored by Jeff Layton's avatar Jeff Layton Committed by Steve French
Browse files

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



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: default avatarSuresh Jayaraman <sjayaraman@suse.de>
Signed-off-by: default avatarJeff Layton <jlayton@redhat.com>
Signed-off-by: default avatarSteve French <sfrench@us.ibm.com>
parent 77970693

fs/cifs/README

+0 −16
Original line number Diff line number Diff line
@@ -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

fs/cifs/cifs_debug.c

+0 −43
Original line number Diff line number Diff line
@@ -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);

fs/cifs/cifsfs.c

+4 −1
Original line number Diff line number Diff line
@@ -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;

fs/cifs/cifsglob.h

+1 −1
Original line number Diff line number Diff line
@@ -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;

fs/cifs/file.c

+2 −2
Original line number Diff line number Diff line
@@ -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);

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