#include <linux/sched.h>
#include <linux/compat.h>
#include <linux/syscalls.h>
-#include <linux/smp_lock.h>
#include <linux/magic.h>
#include <linux/dcache.h>
#include <linux/uaccess.h>
* Check a string doesn't overrun the chunk of
* memory we copied from user land.
*/
-static int invalid_str(char *str, void *end)
+static int invalid_str(char *str, size_t size)
{
- while ((void *) str <= end)
- if (!*str++)
- return 0;
+ if (memchr(str, 0, size))
+ return 0;
return -EINVAL;
}
}
if (param->size > sizeof(*param)) {
- err = invalid_str(param->path,
- (void *) ((size_t) param + param->size));
+ err = invalid_str(param->path, param->size - sizeof(*param));
if (err) {
AUTOFS_WARN(
"path string terminator missing for cmd(0x%08x)",
return 0;
}
-/*
- * Walk down the mount stack looking for an autofs mount that
- * has the requested device number (aka. new_encode_dev(sb->s_dev).
- */
-static int autofs_dev_ioctl_find_super(struct nameidata *nd, dev_t devno)
+static int find_autofs_mount(const char *pathname,
+ struct path *res,
+ int test(struct path *path, void *data),
+ void *data)
{
- struct dentry *dentry;
- struct inode *inode;
- struct super_block *sb;
- dev_t s_dev;
- unsigned int err;
-
+ struct path path;
+ int err = kern_path(pathname, 0, &path);
+ if (err)
+ return err;
err = -ENOENT;
-
- /* Lookup the dentry name at the base of our mount point */
- dentry = d_lookup(nd->path.dentry, &nd->last);
- if (!dentry)
- goto out;
-
- dput(nd->path.dentry);
- nd->path.dentry = dentry;
-
- /* And follow the mount stack looking for our autofs mount */
- while (follow_down(&nd->path.mnt, &nd->path.dentry)) {
- inode = nd->path.dentry->d_inode;
- if (!inode)
- break;
-
- sb = inode->i_sb;
- s_dev = new_encode_dev(sb->s_dev);
- if (devno == s_dev) {
- if (sb->s_magic == AUTOFS_SUPER_MAGIC) {
+ while (path.dentry == path.mnt->mnt_root) {
+ if (path.mnt->mnt_sb->s_magic == AUTOFS_SUPER_MAGIC) {
+ if (test(&path, data)) {
+ path_get(&path);
+ if (!err) /* already found some */
+ path_put(res);
+ *res = path;
err = 0;
- break;
}
}
+ if (!follow_up(&path))
+ break;
}
-out:
+ path_put(&path);
return err;
}
-/*
- * Walk down the mount stack looking for an autofs mount that
- * has the requested mount type (ie. indirect, direct or offset).
- */
-static int autofs_dev_ioctl_find_sbi_type(struct nameidata *nd, unsigned int type)
+static int test_by_dev(struct path *path, void *p)
{
- struct dentry *dentry;
- struct autofs_info *ino;
- unsigned int err;
-
- err = -ENOENT;
-
- /* Lookup the dentry name at the base of our mount point */
- dentry = d_lookup(nd->path.dentry, &nd->last);
- if (!dentry)
- goto out;
-
- dput(nd->path.dentry);
- nd->path.dentry = dentry;
+ return path->mnt->mnt_sb->s_dev == *(dev_t *)p;
+}
- /* And follow the mount stack looking for our autofs mount */
- while (follow_down(&nd->path.mnt, &nd->path.dentry)) {
- ino = autofs4_dentry_ino(nd->path.dentry);
- if (ino && ino->sbi->type & type) {
- err = 0;
- break;
- }
- }
-out:
- return err;
+static int test_by_type(struct path *path, void *p)
+{
+ struct autofs_info *ino = autofs4_dentry_ino(path->dentry);
+ return ino && ino->sbi->type & *(unsigned *)p;
}
static void autofs_dev_ioctl_fd_install(unsigned int fd, struct file *file)
* Open a file descriptor on the autofs mount point corresponding
* to the given path and device number (aka. new_encode_dev(sb->s_dev)).
*/
-static int autofs_dev_ioctl_open_mountpoint(const char *path, dev_t devid)
+static int autofs_dev_ioctl_open_mountpoint(const char *name, dev_t devid)
{
- struct file *filp;
- struct nameidata nd;
int err, fd;
fd = get_unused_fd();
if (likely(fd >= 0)) {
- /* Get nameidata of the parent directory */
- err = path_lookup(path, LOOKUP_PARENT, &nd);
+ struct file *filp;
+ struct path path;
+
+ err = find_autofs_mount(name, &path, test_by_dev, &devid);
if (err)
goto out;
/*
- * Search down, within the parent, looking for an
- * autofs super block that has the device number
+ * Find autofs super block that has the device number
* corresponding to the autofs fs we want to open.
*/
- err = autofs_dev_ioctl_find_super(&nd, devid);
- if (err) {
- path_put(&nd.path);
- goto out;
- }
- filp = dentry_open(nd.path.dentry, nd.path.mnt, O_RDONLY,
+ filp = dentry_open(path.dentry, path.mnt, O_RDONLY,
current_cred());
if (IS_ERR(filp)) {
err = PTR_ERR(filp);
param->ioctlfd = -1;
path = param->path;
- devid = param->openmount.devid;
+ devid = new_decode_dev(param->openmount.devid);
err = 0;
fd = autofs_dev_ioctl_open_mountpoint(path, devid);
struct autofs_dev_ioctl *param)
{
struct autofs_info *ino;
- struct nameidata nd;
- const char *path;
+ struct path path;
dev_t devid;
int err = -ENOENT;
goto out;
}
- path = param->path;
devid = sbi->sb->s_dev;
param->requester.uid = param->requester.gid = -1;
- /* Get nameidata of the parent directory */
- err = path_lookup(path, LOOKUP_PARENT, &nd);
+ err = find_autofs_mount(param->path, &path, test_by_dev, &devid);
if (err)
goto out;
- err = autofs_dev_ioctl_find_super(&nd, devid);
- if (err)
- goto out_release;
-
- ino = autofs4_dentry_ino(nd.path.dentry);
+ ino = autofs4_dentry_ino(path.dentry);
if (ino) {
err = 0;
- autofs4_expire_wait(nd.path.dentry);
+ autofs4_expire_wait(path.dentry);
spin_lock(&sbi->fs_lock);
param->requester.uid = ino->uid;
param->requester.gid = ino->gid;
spin_unlock(&sbi->fs_lock);
}
-
-out_release:
- path_put(&nd.path);
+ path_put(&path);
out:
return err;
}
struct autofs_sb_info *sbi,
struct autofs_dev_ioctl *param)
{
- struct dentry *dentry;
struct vfsmount *mnt;
- int err = -EAGAIN;
int how;
how = param->expire.how;
mnt = fp->f_path.mnt;
- if (autofs_type_trigger(sbi->type))
- dentry = autofs4_expire_direct(sbi->sb, mnt, sbi, how);
- else
- dentry = autofs4_expire_indirect(sbi->sb, mnt, sbi, how);
-
- if (dentry) {
- struct autofs_info *ino = autofs4_dentry_ino(dentry);
-
- /*
- * This is synchronous because it makes the daemon a
- * little easier
- */
- err = autofs4_wait(sbi, dentry, NFY_EXPIRE);
-
- spin_lock(&sbi->fs_lock);
- if (ino->flags & AUTOFS_INF_MOUNTPOINT) {
- ino->flags &= ~AUTOFS_INF_MOUNTPOINT;
- sbi->sb->s_root->d_mounted++;
- }
- ino->flags &= ~AUTOFS_INF_EXPIRING;
- complete_all(&ino->expire_complete);
- spin_unlock(&sbi->fs_lock);
- dput(dentry);
- }
-
- return err;
+ return autofs4_do_expire_multi(sbi->sb, mnt, sbi, how);
}
/* Check if autofs mount point is in use */
struct autofs_sb_info *sbi,
struct autofs_dev_ioctl *param)
{
- struct nameidata nd;
- const char *path;
+ struct path path;
+ const char *name;
unsigned int type;
unsigned int devid, magic;
int err = -ENOENT;
goto out;
}
- path = param->path;
+ name = param->path;
type = param->ismountpoint.in.type;
param->ismountpoint.out.devid = devid = 0;
param->ismountpoint.out.magic = magic = 0;
if (!fp || param->ioctlfd == -1) {
- if (autofs_type_any(type)) {
- struct super_block *sb;
-
- err = path_lookup(path, LOOKUP_FOLLOW, &nd);
- if (err)
- goto out;
-
- sb = nd.path.dentry->d_sb;
- devid = new_encode_dev(sb->s_dev);
- } else {
- struct autofs_info *ino;
-
- err = path_lookup(path, LOOKUP_PARENT, &nd);
- if (err)
- goto out;
-
- err = autofs_dev_ioctl_find_sbi_type(&nd, type);
- if (err)
- goto out_release;
-
- ino = autofs4_dentry_ino(nd.path.dentry);
- devid = autofs4_get_dev(ino->sbi);
- }
-
+ if (autofs_type_any(type))
+ err = kern_path(name, LOOKUP_FOLLOW, &path);
+ else
+ err = find_autofs_mount(name, &path, test_by_type, &type);
+ if (err)
+ goto out;
+ devid = new_encode_dev(path.mnt->mnt_sb->s_dev);
err = 0;
- if (nd.path.dentry->d_inode &&
- nd.path.mnt->mnt_root == nd.path.dentry) {
+ if (path.dentry->d_inode &&
+ path.mnt->mnt_root == path.dentry) {
err = 1;
- magic = nd.path.dentry->d_inode->i_sb->s_magic;
+ magic = path.dentry->d_inode->i_sb->s_magic;
}
} else {
- dev_t dev = autofs4_get_dev(sbi);
+ dev_t dev = sbi->sb->s_dev;
- err = path_lookup(path, LOOKUP_PARENT, &nd);
+ err = find_autofs_mount(name, &path, test_by_dev, &dev);
if (err)
goto out;
- err = autofs_dev_ioctl_find_super(&nd, dev);
- if (err)
- goto out_release;
+ devid = new_encode_dev(dev);
- devid = dev;
+ err = have_submounts(path.dentry);
- err = have_submounts(nd.path.dentry);
-
- if (nd.path.mnt->mnt_mountpoint != nd.path.mnt->mnt_root) {
- if (follow_down(&nd.path.mnt, &nd.path.dentry)) {
- struct inode *inode = nd.path.dentry->d_inode;
- magic = inode->i_sb->s_magic;
- }
+ if (path.mnt->mnt_mountpoint != path.mnt->mnt_root) {
+ if (follow_down(&path))
+ magic = path.mnt->mnt_sb->s_magic;
}
}
param->ismountpoint.out.devid = devid;
param->ismountpoint.out.magic = magic;
-
-out_release:
- path_put(&nd.path);
+ path_put(&path);
out:
return err;
}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff