Commit 4e44b685 authored by Al Viro's avatar Al Viro

Get rid of path_lookup in autofs4

Signed-off-by: 's avatarAl Viro <viro@zeniv.linux.org.uk>
parent 73422811
......@@ -192,77 +192,42 @@ static int autofs_dev_ioctl_protosubver(struct file *fp,
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.mnt, &path.dentry))
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)
......@@ -283,31 +248,25 @@ 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);
......@@ -340,7 +299,7 @@ static int autofs_dev_ioctl_openmount(struct file *fp,
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);
......@@ -475,8 +434,7 @@ static int autofs_dev_ioctl_requester(struct file *fp,
struct autofs_dev_ioctl *param)
{
struct autofs_info *ino;
struct nameidata nd;
const char *path;
struct path path;
dev_t devid;
int err = -ENOENT;
......@@ -485,32 +443,24 @@ static int autofs_dev_ioctl_requester(struct file *fp,
goto out;
}
path = param->path;
devid = new_encode_dev(sbi->sb->s_dev);
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;
}
......@@ -569,8 +519,8 @@ static int autofs_dev_ioctl_ismountpoint(struct file *fp,
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;
......@@ -580,71 +530,46 @@ static int autofs_dev_ioctl_ismountpoint(struct file *fp,
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 = dev;
devid = new_encode_dev(dev);
err = have_submounts(nd.path.dentry);
err = have_submounts(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.mnt, &path.dentry))
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;
}
......
Markdown is supported
0% or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment