Commit e7504734 authored by Steve French's avatar Steve French
Browse files

add new module parameter 'enable_oplocks' 



Thus spake Jeff Layton:

"Making that a module parm would allow you to set that parameter at boot
time without needing to add special startup scripts. IMO, all of the
procfile "switches" under /proc/fs/cifs should be module parms
instead."

This patch doesn't alter the default behavior (Oplocks are enabled by
default).

To disable oplocks when loading the module, use

   modprobe cifs enable_oplocks=0

(any of '0' or 'n' or 'N' conventions can be used).

To disable oplocks at runtime using the new interface, use

   echo 0 > /sys/module/cifs/parameters/enable_oplocks

The older /proc/fs/cifs/OplockEnabled interface will be deprecated
after two releases. A subsequent patch will add an warning message
about this deprecation.

Changes since v2:
   - make enable_oplocks a 'bool'

Changes since v1:
   - eliminate the use of extra variable by renaming the old one to
     enable_oplocks and make it an 'int' type.

Reported-by: default avatarAlexander Swen <alex@swen.nu>
Reviewed-by: default avatarJeff Layton <jlayton@redhat.com>
Signed-off-by: default avatarSuresh Jayaraman <sjayaraman@suse.de>
Signed-off-by: default avatarSteve French <smfrench@gmail.com>
parent ba749e6d

fs/cifs/cifs_debug.c

+3 −3
Original line number Diff line number Diff line
@@ -511,7 +511,7 @@ static const struct file_operations cifsFYI_proc_fops = { 


static int cifs_oplock_proc_show(struct seq_file *m, void *v)

{

	seq_printf(m, "%d\n", oplockEnabled);

	seq_printf(m, "%d\n", enable_oplocks);

	return 0;

}
@@ -530,9 +530,9 @@ static ssize_t cifs_oplock_proc_write(struct file *file, 
	if (rc)

		return rc;

	if (c == '0' || c == 'n' || c == 'N')

		oplockEnabled = 0;

		enable_oplocks = false;

	else if (c == '1' || c == 'y' || c == 'Y')

		oplockEnabled = 1;

		enable_oplocks = true;



	return count;

}

fs/cifs/cifsfs.c

+5 −1
Original line number Diff line number Diff line
@@ -53,7 +53,7 @@ 
int cifsFYI = 0;

int cifsERROR = 1;

int traceSMB = 0;

unsigned int oplockEnabled = 1;

bool enable_oplocks = true;

unsigned int linuxExtEnabled = 1;

unsigned int lookupCacheEnabled = 1;

unsigned int multiuser_mount = 0;
@@ -82,6 +82,10 @@ 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.");

module_param(enable_oplocks, bool, 0644);

MODULE_PARM_DESC(enable_oplocks, "Enable or disable oplocks (bool). Default:"

				 "y/Y/1");



extern mempool_t *cifs_sm_req_poolp;

extern mempool_t *cifs_req_poolp;

extern mempool_t *cifs_mid_poolp;

fs/cifs/cifsglob.h

+2 −1
Original line number Diff line number Diff line
@@ -964,7 +964,8 @@ GLOBAL_EXTERN unsigned int multiuser_mount; /* if enabled allows new sessions 
				to be established on existing mount if we

				have the uid/password or Kerberos credential

				or equivalent for current user */

GLOBAL_EXTERN unsigned int oplockEnabled;

/* enable or disable oplocks */

GLOBAL_EXTERN bool enable_oplocks;

GLOBAL_EXTERN unsigned int lookupCacheEnabled;

GLOBAL_EXTERN unsigned int global_secflags;	/* if on, session setup sent

				with more secure ntlmssp2 challenge/resp */

fs/cifs/dir.c

+1 −1
Original line number Diff line number Diff line
@@ -171,7 +171,7 @@ cifs_create(struct inode *inode, struct dentry *direntry, int mode, 
	}

	tcon = tlink_tcon(tlink);



	if (oplockEnabled)

	if (enable_oplocks)

		oplock = REQ_OPLOCK;



	if (nd)

fs/cifs/file.c

+2 −2
Original line number Diff line number Diff line
@@ -371,7 +371,7 @@ int cifs_open(struct inode *inode, struct file *file) 
	cFYI(1, "inode = 0x%p file flags are 0x%x for %s",

		 inode, file->f_flags, full_path);



	if (oplockEnabled)

	if (enable_oplocks)

		oplock = REQ_OPLOCK;

	else

		oplock = 0;
@@ -495,7 +495,7 @@ static int cifs_reopen_file(struct cifsFileInfo *pCifsFile, bool can_flush) 
	cFYI(1, "inode = 0x%p file flags 0x%x for %s",

		 inode, pCifsFile->f_flags, full_path);



	if (oplockEnabled)

	if (enable_oplocks)

		oplock = REQ_OPLOCK;

	else

		oplock = 0;

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