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authorAl Viro <viro@zeniv.linux.org.uk>2011-11-24 22:53:09 -0500
committerAl Viro <viro@zeniv.linux.org.uk>2012-01-03 22:57:06 -0500
commit68e8a9feab251f9d3c8fd9e9893c97843bcd4bd0 (patch)
tree22fac61a982587cd53ccf05513fbe4ffe60c860d /fs
parent83adc7532229f1909cf37c429780f02f06fe05ee (diff)
downloadlinux-68e8a9feab251f9d3c8fd9e9893c97843bcd4bd0.tar.bz2
vfs: all counters taken to struct mount
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs')
-rw-r--r--fs/mount.h12
-rw-r--r--fs/namespace.c40
2 files changed, 32 insertions, 20 deletions
diff --git a/fs/mount.h b/fs/mount.h
index 853738f5897f..452ae41e0131 100644
--- a/fs/mount.h
+++ b/fs/mount.h
@@ -1,10 +1,22 @@
#include <linux/mount.h>
+struct mnt_pcp {
+ int mnt_count;
+ int mnt_writers;
+};
+
struct mount {
struct list_head mnt_hash;
struct mount *mnt_parent;
struct dentry *mnt_mountpoint;
struct vfsmount mnt;
+#ifdef CONFIG_SMP
+ struct mnt_pcp __percpu *mnt_pcp;
+ atomic_t mnt_longterm; /* how many of the refs are longterm */
+#else
+ int mnt_count;
+ int mnt_writers;
+#endif
};
static inline struct mount *real_mount(struct vfsmount *mnt)
diff --git a/fs/namespace.c b/fs/namespace.c
index a13165c871c2..3fdd30add4f9 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -144,10 +144,10 @@ void mnt_release_group_id(struct mount *mnt)
static inline void mnt_add_count(struct mount *mnt, int n)
{
#ifdef CONFIG_SMP
- this_cpu_add(mnt->mnt.mnt_pcp->mnt_count, n);
+ this_cpu_add(mnt->mnt_pcp->mnt_count, n);
#else
preempt_disable();
- mnt->mnt.mnt_count += n;
+ mnt->mnt_count += n;
preempt_enable();
#endif
}
@@ -162,12 +162,12 @@ unsigned int mnt_get_count(struct mount *mnt)
int cpu;
for_each_possible_cpu(cpu) {
- count += per_cpu_ptr(mnt->mnt.mnt_pcp, cpu)->mnt_count;
+ count += per_cpu_ptr(mnt->mnt_pcp, cpu)->mnt_count;
}
return count;
#else
- return mnt->mnt.mnt_count;
+ return mnt->mnt_count;
#endif
}
@@ -189,14 +189,14 @@ static struct mount *alloc_vfsmnt(const char *name)
}
#ifdef CONFIG_SMP
- mnt->mnt_pcp = alloc_percpu(struct mnt_pcp);
- if (!mnt->mnt_pcp)
+ p->mnt_pcp = alloc_percpu(struct mnt_pcp);
+ if (!p->mnt_pcp)
goto out_free_devname;
- this_cpu_add(mnt->mnt_pcp->mnt_count, 1);
+ this_cpu_add(p->mnt_pcp->mnt_count, 1);
#else
- mnt->mnt_count = 1;
- mnt->mnt_writers = 0;
+ p->mnt_count = 1;
+ p->mnt_writers = 0;
#endif
INIT_LIST_HEAD(&p->mnt_hash);
@@ -256,18 +256,18 @@ EXPORT_SYMBOL_GPL(__mnt_is_readonly);
static inline void mnt_inc_writers(struct mount *mnt)
{
#ifdef CONFIG_SMP
- this_cpu_inc(mnt->mnt.mnt_pcp->mnt_writers);
+ this_cpu_inc(mnt->mnt_pcp->mnt_writers);
#else
- mnt->mnt.mnt_writers++;
+ mnt->mnt_writers++;
#endif
}
static inline void mnt_dec_writers(struct mount *mnt)
{
#ifdef CONFIG_SMP
- this_cpu_dec(mnt->mnt.mnt_pcp->mnt_writers);
+ this_cpu_dec(mnt->mnt_pcp->mnt_writers);
#else
- mnt->mnt.mnt_writers--;
+ mnt->mnt_writers--;
#endif
}
@@ -278,7 +278,7 @@ static unsigned int mnt_get_writers(struct mount *mnt)
int cpu;
for_each_possible_cpu(cpu) {
- count += per_cpu_ptr(mnt->mnt.mnt_pcp, cpu)->mnt_writers;
+ count += per_cpu_ptr(mnt->mnt_pcp, cpu)->mnt_writers;
}
return count;
@@ -454,7 +454,7 @@ static void free_vfsmnt(struct mount *mnt)
kfree(mnt->mnt.mnt_devname);
mnt_free_id(mnt);
#ifdef CONFIG_SMP
- free_percpu(mnt->mnt.mnt_pcp);
+ free_percpu(mnt->mnt_pcp);
#endif
kmem_cache_free(mnt_cache, mnt);
}
@@ -594,7 +594,7 @@ static void attach_mnt(struct mount *mnt, struct path *path)
static inline void __mnt_make_longterm(struct mount *mnt)
{
#ifdef CONFIG_SMP
- atomic_inc(&mnt->mnt.mnt_longterm);
+ atomic_inc(&mnt->mnt_longterm);
#endif
}
@@ -602,7 +602,7 @@ static inline void __mnt_make_longterm(struct mount *mnt)
static inline void __mnt_make_shortterm(struct mount *mnt)
{
#ifdef CONFIG_SMP
- atomic_dec(&mnt->mnt.mnt_longterm);
+ atomic_dec(&mnt->mnt_longterm);
#endif
}
@@ -769,7 +769,7 @@ static void mntput_no_expire(struct vfsmount *m)
put_again:
#ifdef CONFIG_SMP
br_read_lock(vfsmount_lock);
- if (likely(atomic_read(&mnt->mnt.mnt_longterm))) {
+ if (likely(atomic_read(&mnt->mnt_longterm))) {
mnt_add_count(mnt, -1);
br_read_unlock(vfsmount_lock);
return;
@@ -2375,10 +2375,10 @@ void mnt_make_shortterm(struct vfsmount *m)
{
#ifdef CONFIG_SMP
struct mount *mnt = real_mount(m);
- if (atomic_add_unless(&mnt->mnt.mnt_longterm, -1, 1))
+ if (atomic_add_unless(&mnt->mnt_longterm, -1, 1))
return;
br_write_lock(vfsmount_lock);
- atomic_dec(&mnt->mnt.mnt_longterm);
+ atomic_dec(&mnt->mnt_longterm);
br_write_unlock(vfsmount_lock);
#endif
}