mirror of
https://github.com/torvalds/linux
synced 2024-11-05 18:23:50 +00:00
Get rid of path_lookup in autofs4
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro
parent
73422811d2
commit
4e44b6852e
1 changed files with 60 additions and 135 deletions
|
|
@ -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;
|
||||
return path->mnt->mnt_sb->s_dev == *(dev_t *)p;
|
||||
}
|
||||
|
||||
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)) {
|
||||
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 = 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.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;
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in a new issue