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add new module parameter 'enable_oplocks'

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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: Alexander Swen <alex@swen.nu>
Reviewed-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Suresh Jayaraman <sjayaraman@suse.de>
Signed-off-by: Steve French <smfrench@gmail.com>
This commit is contained in:
Steve French 2011-10-12 17:47:03 -05:00
parent ba749e6d52
commit e75047344e
5 changed files with 13 additions and 8 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

6
fs/cifs/cifs_debug.c
View file

@ -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;
}

6
fs/cifs/cifsfs.c
View file

@ -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;

3
fs/cifs/cifsglob.h
View file

@ -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 */

2
fs/cifs/dir.c
View file

@ -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)

4
fs/cifs/file.c
View file

@ -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;