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vfs: spread struct mount - alloc_vfsmnt/free_vfsmnt/mnt_alloc_id/mnt_free_id

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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2011-11-24 20:38:33 -05:00
parent cbbe362cd6
commit b105e270b4
1 changed files with 40 additions and 41 deletions
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81
fs/namespace.c
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@ -78,16 +78,16 @@ static inline unsigned long hash(struct vfsmount *mnt, struct dentry *dentry)
* allocation is serialized by namespace_sem, but we need the spinlock to
* serialize with freeing.
*/
static int mnt_alloc_id(struct vfsmount *mnt)
static int mnt_alloc_id(struct mount *mnt)
{
int res;
retry:
ida_pre_get(&mnt_id_ida, GFP_KERNEL);
spin_lock(&mnt_id_lock);
res = ida_get_new_above(&mnt_id_ida, mnt_id_start, &mnt->mnt_id);
res = ida_get_new_above(&mnt_id_ida, mnt_id_start, &mnt->mnt.mnt_id);
if (!res)
mnt_id_start = mnt->mnt_id + 1;
mnt_id_start = mnt->mnt.mnt_id + 1;
spin_unlock(&mnt_id_lock);
if (res == -EAGAIN)
goto retry;
@ -95,9 +95,9 @@ static int mnt_alloc_id(struct vfsmount *mnt)
return res;
}
static void mnt_free_id(struct vfsmount *mnt)
static void mnt_free_id(struct mount *mnt)
{
int id = mnt->mnt_id;
int id = mnt->mnt.mnt_id;
spin_lock(&mnt_id_lock);
ida_remove(&mnt_id_ida, id);
if (mnt_id_start > id)
@ -171,14 +171,14 @@ unsigned int mnt_get_count(struct vfsmount *mnt)
#endif
}
static struct vfsmount *alloc_vfsmnt(const char *name)
static struct mount *alloc_vfsmnt(const char *name)
{
struct mount *p = kmem_cache_zalloc(mnt_cache, GFP_KERNEL);
if (p) {
struct vfsmount *mnt = &p->mnt;
int err;
err = mnt_alloc_id(mnt);
err = mnt_alloc_id(p);
if (err)
goto out_free_cache;
@ -211,14 +211,14 @@ static struct vfsmount *alloc_vfsmnt(const char *name)
INIT_HLIST_HEAD(&mnt->mnt_fsnotify_marks);
#endif
}
return &p->mnt;
return p;
#ifdef CONFIG_SMP
out_free_devname:
kfree(p->mnt.mnt_devname);
#endif
out_free_id:
mnt_free_id(&p->mnt);
mnt_free_id(p);
out_free_cache:
kmem_cache_free(mnt_cache, p);
return NULL;
@ -448,15 +448,14 @@ static void __mnt_unmake_readonly(struct vfsmount *mnt)
br_write_unlock(vfsmount_lock);
}
static void free_vfsmnt(struct vfsmount *mnt)
static void free_vfsmnt(struct mount *mnt)
{
struct mount *p = real_mount(mnt);
kfree(mnt->mnt_devname);
kfree(mnt->mnt.mnt_devname);
mnt_free_id(mnt);
#ifdef CONFIG_SMP
free_percpu(mnt->mnt_pcp);
free_percpu(mnt->mnt.mnt_pcp);
#endif
kmem_cache_free(mnt_cache, p);
kmem_cache_free(mnt_cache, mnt);
}
/*
@ -661,7 +660,7 @@ static struct mount *skip_mnt_tree(struct mount *p)
struct vfsmount *
vfs_kern_mount(struct file_system_type *type, int flags, const char *name, void *data)
{
struct vfsmount *mnt;
struct mount *mnt;
struct dentry *root;
if (!type)
@ -672,7 +671,7 @@ vfs_kern_mount(struct file_system_type *type, int flags, const char *name, void
return ERR_PTR(-ENOMEM);
if (flags & MS_KERNMOUNT)
mnt->mnt_flags = MNT_INTERNAL;
mnt->mnt.mnt_flags = MNT_INTERNAL;
root = mount_fs(type, flags, name, data);
if (IS_ERR(root)) {
@ -680,11 +679,11 @@ vfs_kern_mount(struct file_system_type *type, int flags, const char *name, void
return ERR_CAST(root);
}
mnt->mnt_root = root;
mnt->mnt_sb = root->d_sb;
mnt->mnt_mountpoint = mnt->mnt_root;
mnt->mnt_parent = mnt;
return mnt;
mnt->mnt.mnt_root = root;
mnt->mnt.mnt_sb = root->d_sb;
mnt->mnt.mnt_mountpoint = mnt->mnt.mnt_root;
mnt->mnt.mnt_parent = &mnt->mnt;
return &mnt->mnt;
}
EXPORT_SYMBOL_GPL(vfs_kern_mount);
@ -692,49 +691,49 @@ static struct vfsmount *clone_mnt(struct vfsmount *old, struct dentry *root,
int flag)
{
struct super_block *sb = old->mnt_sb;
struct vfsmount *mnt = alloc_vfsmnt(old->mnt_devname);
struct mount *mnt = alloc_vfsmnt(old->mnt_devname);
if (mnt) {
if (flag & (CL_SLAVE | CL_PRIVATE))
mnt->mnt_group_id = 0; /* not a peer of original */
mnt->mnt.mnt_group_id = 0; /* not a peer of original */
else
mnt->mnt_group_id = old->mnt_group_id;
mnt->mnt.mnt_group_id = old->mnt_group_id;
if ((flag & CL_MAKE_SHARED) && !mnt->mnt_group_id) {
int err = mnt_alloc_group_id(real_mount(mnt));
if ((flag & CL_MAKE_SHARED) && !mnt->mnt.mnt_group_id) {
int err = mnt_alloc_group_id(mnt);
if (err)
goto out_free;
}
mnt->mnt_flags = old->mnt_flags & ~MNT_WRITE_HOLD;
mnt->mnt.mnt_flags = old->mnt_flags & ~MNT_WRITE_HOLD;
atomic_inc(&sb->s_active);
mnt->mnt_sb = sb;
mnt->mnt_root = dget(root);
mnt->mnt_mountpoint = mnt->mnt_root;
mnt->mnt_parent = mnt;
mnt->mnt.mnt_sb = sb;
mnt->mnt.mnt_root = dget(root);
mnt->mnt.mnt_mountpoint = mnt->mnt.mnt_root;
mnt->mnt.mnt_parent = &mnt->mnt;
if (flag & CL_SLAVE) {
list_add(&mnt->mnt_slave, &old->mnt_slave_list);
mnt->mnt_master = old;
CLEAR_MNT_SHARED(mnt);
list_add(&mnt->mnt.mnt_slave, &old->mnt_slave_list);
mnt->mnt.mnt_master = old;
CLEAR_MNT_SHARED(&mnt->mnt);
} else if (!(flag & CL_PRIVATE)) {
if ((flag & CL_MAKE_SHARED) || IS_MNT_SHARED(old))
list_add(&mnt->mnt_share, &old->mnt_share);
list_add(&mnt->mnt.mnt_share, &old->mnt_share);
if (IS_MNT_SLAVE(old))
list_add(&mnt->mnt_slave, &old->mnt_slave);
mnt->mnt_master = old->mnt_master;
list_add(&mnt->mnt.mnt_slave, &old->mnt_slave);
mnt->mnt.mnt_master = old->mnt_master;
}
if (flag & CL_MAKE_SHARED)
set_mnt_shared(mnt);
set_mnt_shared(&mnt->mnt);
/* stick the duplicate mount on the same expiry list
* as the original if that was on one */
if (flag & CL_EXPIRE) {
if (!list_empty(&old->mnt_expire))
list_add(&mnt->mnt_expire, &old->mnt_expire);
list_add(&mnt->mnt.mnt_expire, &old->mnt_expire);
}
}
return mnt;
return &mnt->mnt;
out_free:
free_vfsmnt(mnt);
@ -758,7 +757,7 @@ static inline void mntfree(struct vfsmount *mnt)
WARN_ON(mnt_get_writers(mnt));
fsnotify_vfsmount_delete(mnt);
dput(mnt->mnt_root);
free_vfsmnt(mnt);
free_vfsmnt(real_mount(mnt));
deactivate_super(sb);
}