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>
diff --git a/fs/autofs4/autofs_i.h b/fs/autofs4/autofs_i.h
index e0f16da..a768031 100644
--- a/fs/autofs4/autofs_i.h
+++ b/fs/autofs4/autofs_i.h
@@ -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>
diff --git a/fs/autofs4/dev-ioctl.c b/fs/autofs4/dev-ioctl.c
index 0566ff8..aa3f472 100644
--- a/fs/autofs4/dev-ioctl.c
+++ b/fs/autofs4/dev-ioctl.c
@@ -532,7 +532,7 @@
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 @@
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);
diff --git a/fs/autofs4/expire.c b/fs/autofs4/expire.c
index 4b6fb3f..e3bd507 100644
--- a/fs/autofs4/expire.c
+++ b/fs/autofs4/expire.c
@@ -63,7 +63,7 @@
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 @@
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);
diff --git a/fs/autofs4/inode.c b/fs/autofs4/inode.c
index cfc23e5..716e12b 100644
--- a/fs/autofs4/inode.c
+++ b/fs/autofs4/inode.c
@@ -197,9 +197,9 @@
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 @@
*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 @@
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 @@
}
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;
diff --git a/fs/autofs4/waitq.c b/fs/autofs4/waitq.c
index e02cc8a..eeb2468 100644
--- a/fs/autofs4/waitq.c
+++ b/fs/autofs4/waitq.c
@@ -337,7 +337,7 @@
* 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 @@
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 @@
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;
}
diff --git a/include/linux/auto_fs4.h b/include/linux/auto_fs4.h
index 2253716d..55fa478 100644
--- a/include/linux/auto_fs4.h
+++ b/include/linux/auto_fs4.h
@@ -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 {
