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-rw-r--r--fs/namespace.c97
1 files changed, 48 insertions, 49 deletions
diff --git a/fs/namespace.c b/fs/namespace.c
index d1aca685aacf..685687dccbf1 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -43,29 +43,29 @@ static int event;
static struct list_head *mount_hashtable;
static int hash_mask __read_mostly, hash_bits __read_mostly;
-static kmem_cache_t *mnt_cache;
+static kmem_cache_t *mnt_cache;
static inline unsigned long hash(struct vfsmount *mnt, struct dentry *dentry)
{
- unsigned long tmp = ((unsigned long) mnt / L1_CACHE_BYTES);
- tmp += ((unsigned long) dentry / L1_CACHE_BYTES);
+ unsigned long tmp = ((unsigned long)mnt / L1_CACHE_BYTES);
+ tmp += ((unsigned long)dentry / L1_CACHE_BYTES);
tmp = tmp + (tmp >> hash_bits);
return tmp & hash_mask;
}
struct vfsmount *alloc_vfsmnt(const char *name)
{
- struct vfsmount *mnt = kmem_cache_alloc(mnt_cache, GFP_KERNEL);
+ struct vfsmount *mnt = kmem_cache_alloc(mnt_cache, GFP_KERNEL);
if (mnt) {
memset(mnt, 0, sizeof(struct vfsmount));
- atomic_set(&mnt->mnt_count,1);
+ atomic_set(&mnt->mnt_count, 1);
INIT_LIST_HEAD(&mnt->mnt_hash);
INIT_LIST_HEAD(&mnt->mnt_child);
INIT_LIST_HEAD(&mnt->mnt_mounts);
INIT_LIST_HEAD(&mnt->mnt_list);
INIT_LIST_HEAD(&mnt->mnt_expire);
if (name) {
- int size = strlen(name)+1;
+ int size = strlen(name) + 1;
char *newname = kmalloc(size, GFP_KERNEL);
if (newname) {
memcpy(newname, name, size);
@@ -88,8 +88,8 @@ void free_vfsmnt(struct vfsmount *mnt)
*/
struct vfsmount *lookup_mnt(struct vfsmount *mnt, struct dentry *dentry)
{
- struct list_head * head = mount_hashtable + hash(mnt, dentry);
- struct list_head * tmp = head;
+ struct list_head *head = mount_hashtable + hash(mnt, dentry);
+ struct list_head *tmp = head;
struct vfsmount *p, *found = NULL;
spin_lock(&vfsmount_lock);
@@ -144,7 +144,7 @@ static void attach_mnt(struct vfsmount *mnt, struct nameidata *nd)
{
mnt->mnt_parent = mntget(nd->mnt);
mnt->mnt_mountpoint = dget(nd->dentry);
- list_add(&mnt->mnt_hash, mount_hashtable+hash(nd->mnt, nd->dentry));
+ list_add(&mnt->mnt_hash, mount_hashtable + hash(nd->mnt, nd->dentry));
list_add_tail(&mnt->mnt_child, &nd->mnt->mnt_mounts);
nd->dentry->d_mounted++;
}
@@ -165,8 +165,7 @@ static struct vfsmount *next_mnt(struct vfsmount *p, struct vfsmount *root)
return list_entry(next, struct vfsmount, mnt_child);
}
-static struct vfsmount *
-clone_mnt(struct vfsmount *old, struct dentry *root)
+static struct vfsmount *clone_mnt(struct vfsmount *old, struct dentry *root)
{
struct super_block *sb = old->mnt_sb;
struct vfsmount *mnt = alloc_vfsmnt(old->mnt_devname);
@@ -258,7 +257,7 @@ static void *m_next(struct seq_file *m, void *v, loff_t *pos)
struct namespace *n = m->private;
struct list_head *p = ((struct vfsmount *)v)->mnt_list.next;
(*pos)++;
- return p==&n->list ? NULL : list_entry(p, struct vfsmount, mnt_list);
+ return p == &n->list ? NULL : list_entry(p, struct vfsmount, mnt_list);
}
static void m_stop(struct seq_file *m, void *v)
@@ -344,7 +343,8 @@ repeat:
next = this_parent->mnt_mounts.next;
resume:
while (next != &this_parent->mnt_mounts) {
- struct vfsmount *p = list_entry(next, struct vfsmount, mnt_child);
+ struct vfsmount *p =
+ list_entry(next, struct vfsmount, mnt_child);
next = next->next;
@@ -425,7 +425,7 @@ static void umount_tree(struct vfsmount *mnt)
static int do_umount(struct vfsmount *mnt, int flags)
{
- struct super_block * sb = mnt->mnt_sb;
+ struct super_block *sb = mnt->mnt_sb;
int retval;
retval = security_sb_umount(mnt, flags);
@@ -461,7 +461,7 @@ static int do_umount(struct vfsmount *mnt, int flags)
*/
lock_kernel();
- if( (flags&MNT_FORCE) && sb->s_op->umount_begin)
+ if ((flags & MNT_FORCE) && sb->s_op->umount_begin)
sb->s_op->umount_begin(sb);
unlock_kernel();
@@ -543,12 +543,11 @@ out:
#ifdef __ARCH_WANT_SYS_OLDUMOUNT
/*
- * The 2.0 compatible umount. No flags.
+ * The 2.0 compatible umount. No flags.
*/
-
asmlinkage long sys_oldumount(char __user * name)
{
- return sys_umount(name,0);
+ return sys_umount(name, 0);
}
#endif
@@ -571,8 +570,7 @@ static int mount_is_safe(struct nameidata *nd)
#endif
}
-static int
-lives_below_in_same_fs(struct dentry *d, struct dentry *dentry)
+static int lives_below_in_same_fs(struct dentry *d, struct dentry *dentry)
{
while (1) {
if (d == dentry)
@@ -616,7 +614,7 @@ static struct vfsmount *copy_tree(struct vfsmount *mnt, struct dentry *dentry)
}
}
return res;
- Enomem:
+Enomem:
if (res) {
spin_lock(&vfsmount_lock);
umount_tree(res);
@@ -718,12 +716,11 @@ out:
* If you've mounted a non-root directory somewhere and want to do remount
* on it - tough luck.
*/
-
static int do_remount(struct nameidata *nd, int flags, int mnt_flags,
void *data)
{
int err;
- struct super_block * sb = nd->mnt->mnt_sb;
+ struct super_block *sb = nd->mnt->mnt_sb;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
@@ -737,7 +734,7 @@ static int do_remount(struct nameidata *nd, int flags, int mnt_flags,
down_write(&sb->s_umount);
err = do_remount_sb(sb, flags, data, 0);
if (!err)
- nd->mnt->mnt_flags=mnt_flags;
+ nd->mnt->mnt_flags = mnt_flags;
up_write(&sb->s_umount);
if (!err)
security_sb_post_remount(nd->mnt, flags, data);
@@ -758,7 +755,7 @@ static int do_move_mount(struct nameidata *nd, char *old_name)
return err;
down_write(&current->namespace->sem);
- while(d_mountpoint(nd->dentry) && follow_down(&nd->mnt, &nd->dentry))
+ while (d_mountpoint(nd->dentry) && follow_down(&nd->mnt, &nd->dentry))
;
err = -EINVAL;
if (!check_mnt(nd->mnt) || !check_mnt(old_nd.mnt))
@@ -785,7 +782,7 @@ static int do_move_mount(struct nameidata *nd, char *old_name)
goto out2;
err = -ELOOP;
- for (p = nd->mnt; p->mnt_parent!=p; p = p->mnt_parent)
+ for (p = nd->mnt; p->mnt_parent != p; p = p->mnt_parent)
if (p == old_nd.mnt)
goto out2;
err = 0;
@@ -843,7 +840,7 @@ int do_add_mount(struct vfsmount *newmnt, struct nameidata *nd,
down_write(&current->namespace->sem);
/* Something was mounted here while we slept */
- while(d_mountpoint(nd->dentry) && follow_down(&nd->mnt, &nd->dentry))
+ while (d_mountpoint(nd->dentry) && follow_down(&nd->mnt, &nd->dentry))
;
err = -EINVAL;
if (!check_mnt(nd->mnt))
@@ -986,8 +983,8 @@ EXPORT_SYMBOL_GPL(mark_mounts_for_expiry);
* Note that this function differs from copy_from_user() in that it will oops
* on bad values of `to', rather than returning a short copy.
*/
-static long
-exact_copy_from_user(void *to, const void __user *from, unsigned long n)
+static long exact_copy_from_user(void *to, const void __user * from,
+ unsigned long n)
{
char *t = to;
const char __user *f = from;
@@ -1008,12 +1005,12 @@ exact_copy_from_user(void *to, const void __user *from, unsigned long n)
return n;
}
-int copy_mount_options(const void __user *data, unsigned long *where)
+int copy_mount_options(const void __user * data, unsigned long *where)
{
int i;
unsigned long page;
unsigned long size;
-
+
*where = 0;
if (!data)
return 0;
@@ -1032,7 +1029,7 @@ int copy_mount_options(const void __user *data, unsigned long *where)
i = size - exact_copy_from_user((void *)page, data, size);
if (!i) {
- free_page(page);
+ free_page(page);
return -EFAULT;
}
if (i != PAGE_SIZE)
@@ -1055,7 +1052,7 @@ int copy_mount_options(const void __user *data, unsigned long *where)
* Therefore, if this magic number is present, it carries no information
* and must be discarded.
*/
-long do_mount(char * dev_name, char * dir_name, char *type_page,
+long do_mount(char *dev_name, char *dir_name, char *type_page,
unsigned long flags, void *data_page)
{
struct nameidata nd;
@@ -1083,7 +1080,7 @@ long do_mount(char * dev_name, char * dir_name, char *type_page,
mnt_flags |= MNT_NODEV;
if (flags & MS_NOEXEC)
mnt_flags |= MNT_NOEXEC;
- flags &= ~(MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_ACTIVE);
+ flags &= ~(MS_NOSUID | MS_NOEXEC | MS_NODEV | MS_ACTIVE);
/* ... and get the mountpoint */
retval = path_lookup(dir_name, LOOKUP_FOLLOW, &nd);
@@ -1207,7 +1204,7 @@ asmlinkage long sys_mount(char __user * dev_name, char __user * dir_name,
unsigned long dev_page;
char *dir_page;
- retval = copy_mount_options (type, &type_page);
+ retval = copy_mount_options(type, &type_page);
if (retval < 0)
return retval;
@@ -1216,17 +1213,17 @@ asmlinkage long sys_mount(char __user * dev_name, char __user * dir_name,
if (IS_ERR(dir_page))
goto out1;
- retval = copy_mount_options (dev_name, &dev_page);
+ retval = copy_mount_options(dev_name, &dev_page);
if (retval < 0)
goto out2;
- retval = copy_mount_options (data, &data_page);
+ retval = copy_mount_options(data, &data_page);
if (retval < 0)
goto out3;
lock_kernel();
- retval = do_mount((char*)dev_page, dir_page, (char*)type_page,
- flags, (void*)data_page);
+ retval = do_mount((char *)dev_page, dir_page, (char *)type_page,
+ flags, (void *)data_page);
unlock_kernel();
free_page(data_page);
@@ -1295,9 +1292,11 @@ static void chroot_fs_refs(struct nameidata *old_nd, struct nameidata *new_nd)
if (fs) {
atomic_inc(&fs->count);
task_unlock(p);
- if (fs->root==old_nd->dentry&&fs->rootmnt==old_nd->mnt)
+ if (fs->root == old_nd->dentry
+ && fs->rootmnt == old_nd->mnt)
set_fs_root(fs, new_nd->mnt, new_nd->dentry);
- if (fs->pwd==old_nd->dentry&&fs->pwdmnt==old_nd->mnt)
+ if (fs->pwd == old_nd->dentry
+ && fs->pwdmnt == old_nd->mnt)
set_fs_pwd(fs, new_nd->mnt, new_nd->dentry);
put_fs_struct(fs);
} else
@@ -1327,8 +1326,8 @@ static void chroot_fs_refs(struct nameidata *old_nd, struct nameidata *new_nd)
* though, so you may need to say mount --bind /nfs/my_root /nfs/my_root
* first.
*/
-
-asmlinkage long sys_pivot_root(const char __user *new_root, const char __user *put_old)
+asmlinkage long sys_pivot_root(const char __user * new_root,
+ const char __user * put_old)
{
struct vfsmount *tmp;
struct nameidata new_nd, old_nd, parent_nd, root_parent, user_nd;
@@ -1339,14 +1338,15 @@ asmlinkage long sys_pivot_root(const char __user *new_root, const char __user *p
lock_kernel();
- error = __user_walk(new_root, LOOKUP_FOLLOW|LOOKUP_DIRECTORY, &new_nd);
+ error = __user_walk(new_root, LOOKUP_FOLLOW | LOOKUP_DIRECTORY,
+ &new_nd);
if (error)
goto out0;
error = -EINVAL;
if (!check_mnt(new_nd.mnt))
goto out1;
- error = __user_walk(put_old, LOOKUP_FOLLOW|LOOKUP_DIRECTORY, &old_nd);
+ error = __user_walk(put_old, LOOKUP_FOLLOW | LOOKUP_DIRECTORY, &old_nd);
if (error)
goto out1;
@@ -1464,10 +1464,9 @@ void __init mnt_init(unsigned long mempages)
int i;
mnt_cache = kmem_cache_create("mnt_cache", sizeof(struct vfsmount),
- 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL, NULL);
+ 0, SLAB_HWCACHE_ALIGN | SLAB_PANIC, NULL, NULL);
- mount_hashtable = (struct list_head *)
- __get_free_page(GFP_ATOMIC);
+ mount_hashtable = (struct list_head *)__get_free_page(GFP_ATOMIC);
if (!mount_hashtable)
panic("Failed to allocate mount hash table\n");
@@ -1489,7 +1488,7 @@ void __init mnt_init(unsigned long mempages)
* from the number of bits we can fit.
*/
nr_hash = 1UL << hash_bits;
- hash_mask = nr_hash-1;
+ hash_mask = nr_hash - 1;
printk("Mount-cache hash table entries: %d\n", nr_hash);
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-25 01:38:32 +0000