autofs4: make autofs type usage explicit

- the type assigned at mount when no type is given is changed
  from 0 to AUTOFS_TYPE_INDIRECT. This was done because 0 and
  AUTOFS_TYPE_INDIRECT were being treated implicitly as the same
  type.

- previously, an offset mount had it's type set to
  AUTOFS_TYPE_DIRECT|AUTOFS_TYPE_OFFSET but the mount control
  re-implementation needs to be able distinguish all three types.
  So this was changed to make the type setting explicit.

- a type AUTOFS_TYPE_ANY was added for use by the re-implementation
  when checking if a given path is a mountpoint. It's not really a
  type as we use this to ask if a given path is a mountpoint in the
  autofs_dev_ioctl_ismountpoint() function.

- functions to set and test the autofs mount types have been added to
  improve readability and make the type usage explicit.

- the mount type is used from user space for the mount control
  re-implementtion so, for consistency, all the definitions have
  been moved to the user space include file include/linux/auto_fs4.h.

Signed-off-by: Ian Kent <raven@themaw.net>
Signed-off-by: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Ian Kent 2009-01-06 14:42:08 -08:00 committed by Linus Torvalds
parent 41cfef2eb8
commit a92daf6ba1
6 changed files with 73 additions and 21 deletions

View File

@ -25,8 +25,6 @@
#define AUTOFS_DEV_IOCTL_IOC_FIRST (AUTOFS_DEV_IOCTL_VERSION)
#define AUTOFS_DEV_IOCTL_IOC_COUNT (AUTOFS_IOC_COUNT - 11)
#define AUTOFS_TYPE_TRIGGER (AUTOFS_TYPE_DIRECT|AUTOFS_TYPE_OFFSET)
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/time.h>

View File

@ -532,7 +532,7 @@ static int autofs_dev_ioctl_expire(struct file *fp,
how = param->expire.how;
mnt = fp->f_path.mnt;
if (sbi->type & AUTOFS_TYPE_TRIGGER)
if (autofs_type_trigger(sbi->type))
dentry = autofs4_expire_direct(sbi->sb, mnt, sbi, how);
else
dentry = autofs4_expire_indirect(sbi->sb, mnt, sbi, how);
@ -615,7 +615,7 @@ static int autofs_dev_ioctl_ismountpoint(struct file *fp,
param->ismountpoint.out.magic = magic = 0;
if (!fp || param->ioctlfd == -1) {
if (type == AUTOFS_TYPE_ANY) {
if (autofs_type_any(type)) {
struct super_block *sb;
err = path_lookup(path, LOOKUP_FOLLOW, &nd);

View File

@ -63,7 +63,7 @@ static int autofs4_mount_busy(struct vfsmount *mnt, struct dentry *dentry)
struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
/* This is an autofs submount, we can't expire it */
if (sbi->type == AUTOFS_TYPE_INDIRECT)
if (autofs_type_indirect(sbi->type))
goto done;
/*
@ -490,7 +490,7 @@ int autofs4_expire_multi(struct super_block *sb, struct vfsmount *mnt,
if (arg && get_user(do_now, arg))
return -EFAULT;
if (sbi->type & AUTOFS_TYPE_TRIGGER)
if (autofs_type_trigger(sbi->type))
dentry = autofs4_expire_direct(sb, mnt, sbi, do_now);
else
dentry = autofs4_expire_indirect(sb, mnt, sbi, do_now);

View File

@ -197,9 +197,9 @@ static int autofs4_show_options(struct seq_file *m, struct vfsmount *mnt)
seq_printf(m, ",minproto=%d", sbi->min_proto);
seq_printf(m, ",maxproto=%d", sbi->max_proto);
if (sbi->type & AUTOFS_TYPE_OFFSET)
if (autofs_type_offset(sbi->type))
seq_printf(m, ",offset");
else if (sbi->type & AUTOFS_TYPE_DIRECT)
else if (autofs_type_direct(sbi->type))
seq_printf(m, ",direct");
else
seq_printf(m, ",indirect");
@ -284,13 +284,13 @@ static int parse_options(char *options, int *pipefd, uid_t *uid, gid_t *gid,
*maxproto = option;
break;
case Opt_indirect:
*type = AUTOFS_TYPE_INDIRECT;
set_autofs_type_indirect(type);
break;
case Opt_direct:
*type = AUTOFS_TYPE_DIRECT;
set_autofs_type_direct(type);
break;
case Opt_offset:
*type = AUTOFS_TYPE_OFFSET;
set_autofs_type_offset(type);
break;
default:
return 1;
@ -338,7 +338,7 @@ int autofs4_fill_super(struct super_block *s, void *data, int silent)
sbi->sb = s;
sbi->version = 0;
sbi->sub_version = 0;
sbi->type = AUTOFS_TYPE_INDIRECT;
set_autofs_type_indirect(&sbi->type);
sbi->min_proto = 0;
sbi->max_proto = 0;
mutex_init(&sbi->wq_mutex);
@ -380,7 +380,7 @@ int autofs4_fill_super(struct super_block *s, void *data, int silent)
}
root_inode->i_fop = &autofs4_root_operations;
root_inode->i_op = sbi->type & AUTOFS_TYPE_TRIGGER ?
root_inode->i_op = autofs_type_trigger(sbi->type) ?
&autofs4_direct_root_inode_operations :
&autofs4_indirect_root_inode_operations;

View File

@ -337,7 +337,7 @@ int autofs4_wait(struct autofs_sb_info *sbi, struct dentry *dentry,
* is very similar for indirect mounts except only dentrys
* in the root of the autofs file system may be negative.
*/
if (sbi->type & AUTOFS_TYPE_TRIGGER)
if (autofs_type_trigger(sbi->type))
return -ENOENT;
else if (!IS_ROOT(dentry->d_parent))
return -ENOENT;
@ -348,7 +348,7 @@ int autofs4_wait(struct autofs_sb_info *sbi, struct dentry *dentry,
return -ENOMEM;
/* If this is a direct mount request create a dummy name */
if (IS_ROOT(dentry) && sbi->type & AUTOFS_TYPE_TRIGGER)
if (IS_ROOT(dentry) && autofs_type_trigger(sbi->type))
qstr.len = sprintf(name, "%p", dentry);
else {
qstr.len = autofs4_getpath(sbi, dentry, &name);
@ -406,11 +406,11 @@ int autofs4_wait(struct autofs_sb_info *sbi, struct dentry *dentry,
type = autofs_ptype_expire_multi;
} else {
if (notify == NFY_MOUNT)
type = (sbi->type & AUTOFS_TYPE_TRIGGER) ?
type = autofs_type_trigger(sbi->type) ?
autofs_ptype_missing_direct :
autofs_ptype_missing_indirect;
else
type = (sbi->type & AUTOFS_TYPE_TRIGGER) ?
type = autofs_type_trigger(sbi->type) ?
autofs_ptype_expire_direct :
autofs_ptype_expire_indirect;
}

View File

@ -29,10 +29,64 @@
#define AUTOFS_EXP_IMMEDIATE 1
#define AUTOFS_EXP_LEAVES 2
#define AUTOFS_TYPE_ANY 0x0000
#define AUTOFS_TYPE_INDIRECT 0x0001
#define AUTOFS_TYPE_DIRECT 0x0002
#define AUTOFS_TYPE_OFFSET 0x0004
#define AUTOFS_TYPE_ANY 0U
#define AUTOFS_TYPE_INDIRECT 1U
#define AUTOFS_TYPE_DIRECT 2U
#define AUTOFS_TYPE_OFFSET 4U
static inline void set_autofs_type_indirect(unsigned int *type)
{
*type = AUTOFS_TYPE_INDIRECT;
return;
}
static inline unsigned int autofs_type_indirect(unsigned int type)
{
return (type == AUTOFS_TYPE_INDIRECT);
}
static inline void set_autofs_type_direct(unsigned int *type)
{
*type = AUTOFS_TYPE_DIRECT;
return;
}
static inline unsigned int autofs_type_direct(unsigned int type)
{
return (type == AUTOFS_TYPE_DIRECT);
}
static inline void set_autofs_type_offset(unsigned int *type)
{
*type = AUTOFS_TYPE_OFFSET;
return;
}
static inline unsigned int autofs_type_offset(unsigned int type)
{
return (type == AUTOFS_TYPE_OFFSET);
}
static inline unsigned int autofs_type_trigger(unsigned int type)
{
return (type == AUTOFS_TYPE_DIRECT || type == AUTOFS_TYPE_OFFSET);
}
/*
* This isn't really a type as we use it to say "no type set" to
* indicate we want to search for "any" mount in the
* autofs_dev_ioctl_ismountpoint() device ioctl function.
*/
static inline void set_autofs_type_any(unsigned int *type)
{
*type = AUTOFS_TYPE_ANY;
return;
}
static inline unsigned int autofs_type_any(unsigned int type)
{
return (type == AUTOFS_TYPE_ANY);
}
/* Daemon notification packet types */
enum autofs_notify {