adulau/aha
1
0
Fork 0
mirror of https://github.com/adulau/aha.git synced 2024-12-28 03:36:19 +00:00
Code Issues Projects Releases Packages Wiki Activity

[PATCH] lindent fs/namespace.c

Browse source 
Signed-off-by: Ram Pai <linuxram@us.ibm.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Ram Pai 2005-11-07 17:16:09 -05:00 committed by Linus Torvalds
parent 5addc5dd88
commit b58fed8b19
1 changed files with 48 additions and 49 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

97
fs/namespace.c
View file

@ -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);