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new helpers: lock_mount_hash/unlock_mount_hash

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aka br_write_{lock,unlock} of vfsmount_lock.  Inlines in fs/mount.h,
vfsmount_lock extern moved over there as well.

Signed-off-by: Al Viro <[email protected]>
This commit is contained in:
Al Viro 2013-09-29 11:24:49 -04:00
commit 719ea2fbb5
5 changed files with 64 additions and 54 deletions
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13
fs/mount.h
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@ -1,6 +1,7 @@
#include <linux/mount.h>
#include <linux/seq_file.h>
#include <linux/poll.h>
#include <linux/lglock.h>
struct mnt_namespace {
atomic_t count;
@ -83,6 +84,18 @@ static inline void get_mnt_ns(struct mnt_namespace *ns)
atomic_inc(&ns->count);
}
extern struct lglock vfsmount_lock;
static inline void lock_mount_hash(void)
{
br_write_lock(&vfsmount_lock);
}
static inline void unlock_mount_hash(void)
{
br_write_unlock(&vfsmount_lock);
}
struct proc_mounts {
struct seq_file m;
struct mnt_namespace *ns;