return getname_flags(filename, 0, NULL);
}
-/*
- * The "getname_kernel()" interface doesn't do pathnames longer
- * than EMBEDDED_NAME_MAX. Deal with it - you're a kernel user.
- */
struct filename *
getname_kernel(const char * filename)
{
struct filename *result;
- char *kname;
- int len;
-
- len = strlen(filename);
- if (len >= EMBEDDED_NAME_MAX)
- return ERR_PTR(-ENAMETOOLONG);
+ int len = strlen(filename) + 1;
result = __getname();
if (unlikely(!result))
return ERR_PTR(-ENOMEM);
- kname = (char *)result + sizeof(*result);
- result->name = kname;
+ if (len <= EMBEDDED_NAME_MAX) {
+ result->name = (char *)(result) + sizeof(*result);
+ result->separate = false;
+ } else if (len <= PATH_MAX) {
+ struct filename *tmp;
+
+ tmp = kmalloc(sizeof(*tmp), GFP_KERNEL);
+ if (unlikely(!tmp)) {
+ __putname(result);
+ return ERR_PTR(-ENOMEM);
+ }
+ tmp->name = (char *)result;
+ tmp->separate = true;
+ result = tmp;
+ } else {
+ __putname(result);
+ return ERR_PTR(-ENAMETOOLONG);
+ }
+ memcpy((char *)result->name, filename, len);
result->uptr = NULL;
result->aname = NULL;
- result->separate = false;
+ audit_getname(result);
- strlcpy(kname, filename, EMBEDDED_NAME_MAX);
return result;
}
}
EXPORT_SYMBOL(path_put);
+struct nameidata {
+ struct path path;
+ struct qstr last;
+ struct path root;
+ struct inode *inode; /* path.dentry.d_inode */
+ unsigned int flags;
+ unsigned seq, m_seq;
+ int last_type;
+ unsigned depth;
+ struct file *base;
+ char *saved_names[MAX_NESTED_LINKS + 1];
+};
+
/*
* Path walking has 2 modes, rcu-walk and ref-walk (see
* Documentation/filesystems/path-lookup.txt). In situations when we can't
nd->flags |= LOOKUP_JUMPED;
}
+void nd_set_link(struct nameidata *nd, char *path)
+{
+ nd->saved_names[nd->depth] = path;
+}
+EXPORT_SYMBOL(nd_set_link);
+
+char *nd_get_link(struct nameidata *nd)
+{
+ return nd->saved_names[nd->depth];
+}
+EXPORT_SYMBOL(nd_get_link);
+
static inline void put_link(struct nameidata *nd, struct path *link, void *cookie)
{
struct inode *inode = link->dentry->d_inode;
}
static int path_init(int dfd, const char *name, unsigned int flags,
- struct nameidata *nd, struct file **fp)
+ struct nameidata *nd)
{
int retval = 0;
nd->last_type = LAST_ROOT; /* if there are only slashes... */
- nd->flags = flags | LOOKUP_JUMPED;
+ nd->flags = flags | LOOKUP_JUMPED | LOOKUP_PARENT;
nd->depth = 0;
+ nd->base = NULL;
if (flags & LOOKUP_ROOT) {
struct dentry *root = nd->root.dentry;
struct inode *inode = root->d_inode;
} else {
path_get(&nd->path);
}
- return 0;
+ goto done;
}
nd->root.mnt = NULL;
nd->path = f.file->f_path;
if (flags & LOOKUP_RCU) {
if (f.flags & FDPUT_FPUT)
- *fp = f.file;
+ nd->base = f.file;
nd->seq = __read_seqcount_begin(&nd->path.dentry->d_seq);
rcu_read_lock();
} else {
nd->inode = nd->path.dentry->d_inode;
if (!(flags & LOOKUP_RCU))
- return 0;
+ goto done;
if (likely(!read_seqcount_retry(&nd->path.dentry->d_seq, nd->seq)))
- return 0;
+ goto done;
if (!(nd->flags & LOOKUP_ROOT))
nd->root.mnt = NULL;
rcu_read_unlock();
return -ECHILD;
+done:
+ current->total_link_count = 0;
+ return link_path_walk(name, nd);
+}
+
+static void path_cleanup(struct nameidata *nd)
+{
+ if (nd->root.mnt && !(nd->flags & LOOKUP_ROOT)) {
+ path_put(&nd->root);
+ nd->root.mnt = NULL;
+ }
+ if (unlikely(nd->base))
+ fput(nd->base);
}
static inline int lookup_last(struct nameidata *nd, struct path *path)
static int path_lookupat(int dfd, const char *name,
unsigned int flags, struct nameidata *nd)
{
- struct file *base = NULL;
struct path path;
int err;
* be handled by restarting a traditional ref-walk (which will always
* be able to complete).
*/
- err = path_init(dfd, name, flags | LOOKUP_PARENT, nd, &base);
-
- if (unlikely(err))
- goto out;
-
- current->total_link_count = 0;
- err = link_path_walk(name, nd);
-
+ err = path_init(dfd, name, flags, nd);
if (!err && !(flags & LOOKUP_PARENT)) {
err = lookup_last(nd, &path);
while (err > 0) {
}
}
-out:
- if (base)
- fput(base);
-
- if (nd->root.mnt && !(nd->flags & LOOKUP_ROOT)) {
- path_put(&nd->root);
- nd->root.mnt = NULL;
- }
+ path_cleanup(nd);
return err;
}
static int do_path_lookup(int dfd, const char *name,
unsigned int flags, struct nameidata *nd)
{
- struct filename filename = { .name = name };
+ struct filename *filename = getname_kernel(name);
+ int retval = PTR_ERR(filename);
- return filename_lookup(dfd, &filename, flags, nd);
+ if (!IS_ERR(filename)) {
+ retval = filename_lookup(dfd, filename, flags, nd);
+ putname(filename);
+ }
+ return retval;
}
/* does lookup, returns the object with parent locked */
struct dentry *kern_path_locked(const char *name, struct path *path)
{
+ struct filename *filename = getname_kernel(name);
struct nameidata nd;
struct dentry *d;
- int err = do_path_lookup(AT_FDCWD, name, LOOKUP_PARENT, &nd);
- if (err)
- return ERR_PTR(err);
+ int err;
+
+ if (IS_ERR(filename))
+ return ERR_CAST(filename);
+
+ err = filename_lookup(AT_FDCWD, filename, LOOKUP_PARENT, &nd);
+ if (err) {
+ d = ERR_PTR(err);
+ goto out;
+ }
if (nd.last_type != LAST_NORM) {
path_put(&nd.path);
- return ERR_PTR(-EINVAL);
+ d = ERR_PTR(-EINVAL);
+ goto out;
}
mutex_lock_nested(&nd.path.dentry->d_inode->i_mutex, I_MUTEX_PARENT);
d = __lookup_hash(&nd.last, nd.path.dentry, 0);
if (IS_ERR(d)) {
mutex_unlock(&nd.path.dentry->d_inode->i_mutex);
path_put(&nd.path);
- return d;
+ goto out;
}
*path = nd.path;
+out:
+ putname(filename);
return d;
}
static int
path_mountpoint(int dfd, const char *name, struct path *path, unsigned int flags)
{
- struct file *base = NULL;
struct nameidata nd;
int err;
- err = path_init(dfd, name, flags | LOOKUP_PARENT, &nd, &base);
+ err = path_init(dfd, name, flags, &nd);
if (unlikely(err))
goto out;
- current->total_link_count = 0;
- err = link_path_walk(name, &nd);
- if (err)
- goto out;
-
err = mountpoint_last(&nd, path);
while (err > 0) {
void *cookie;
put_link(&nd, &link, cookie);
}
out:
- if (base)
- fput(base);
-
- if (nd.root.mnt && !(nd.flags & LOOKUP_ROOT))
- path_put(&nd.root);
-
+ path_cleanup(&nd);
return err;
}
filename_mountpoint(int dfd, struct filename *s, struct path *path,
unsigned int flags)
{
- int error = path_mountpoint(dfd, s->name, path, flags | LOOKUP_RCU);
+ int error;
+ if (IS_ERR(s))
+ return PTR_ERR(s);
+ error = path_mountpoint(dfd, s->name, path, flags | LOOKUP_RCU);
if (unlikely(error == -ECHILD))
error = path_mountpoint(dfd, s->name, path, flags);
if (unlikely(error == -ESTALE))
error = path_mountpoint(dfd, s->name, path, flags | LOOKUP_REVAL);
if (likely(!error))
audit_inode(s, path->dentry, 0);
+ putname(s);
return error;
}
user_path_mountpoint_at(int dfd, const char __user *name, unsigned int flags,
struct path *path)
{
- struct filename *s = getname(name);
- int error;
- if (IS_ERR(s))
- return PTR_ERR(s);
- error = filename_mountpoint(dfd, s, path, flags);
- putname(s);
- return error;
+ return filename_mountpoint(dfd, getname(name), path, flags);
}
int
kern_path_mountpoint(int dfd, const char *name, struct path *path,
unsigned int flags)
{
- struct filename s = {.name = name};
- return filename_mountpoint(dfd, &s, path, flags);
+ return filename_mountpoint(dfd, getname_kernel(name), path, flags);
}
EXPORT_SYMBOL(kern_path_mountpoint);
static struct file *path_openat(int dfd, struct filename *pathname,
struct nameidata *nd, const struct open_flags *op, int flags)
{
- struct file *base = NULL;
struct file *file;
struct path path;
int opened = 0;
goto out;
}
- error = path_init(dfd, pathname->name, flags | LOOKUP_PARENT, nd, &base);
- if (unlikely(error))
- goto out;
-
- current->total_link_count = 0;
- error = link_path_walk(pathname->name, nd);
+ error = path_init(dfd, pathname->name, flags, nd);
if (unlikely(error))
goto out;
put_link(nd, &link, cookie);
}
out:
- if (nd->root.mnt && !(nd->flags & LOOKUP_ROOT))
- path_put(&nd->root);
- if (base)
- fput(base);
+ path_cleanup(nd);
if (!(opened & FILE_OPENED)) {
BUG_ON(!error);
put_filp(file);
{
struct nameidata nd;
struct file *file;
- struct filename filename = { .name = name };
+ struct filename *filename;
int flags = op->lookup_flags | LOOKUP_ROOT;
nd.root.mnt = mnt;
if (d_is_symlink(dentry) && op->intent & LOOKUP_OPEN)
return ERR_PTR(-ELOOP);
- file = path_openat(-1, &filename, &nd, op, flags | LOOKUP_RCU);
+ filename = getname_kernel(name);
+ if (unlikely(IS_ERR(filename)))
+ return ERR_CAST(filename);
+
+ file = path_openat(-1, filename, &nd, op, flags | LOOKUP_RCU);
if (unlikely(file == ERR_PTR(-ECHILD)))
- file = path_openat(-1, &filename, &nd, op, flags);
+ file = path_openat(-1, filename, &nd, op, flags);
if (unlikely(file == ERR_PTR(-ESTALE)))
- file = path_openat(-1, &filename, &nd, op, flags | LOOKUP_REVAL);
+ file = path_openat(-1, filename, &nd, op, flags | LOOKUP_REVAL);
+ putname(filename);
return file;
}
-struct dentry *kern_path_create(int dfd, const char *pathname,
+static struct dentry *filename_create(int dfd, struct filename *name,
struct path *path, unsigned int lookup_flags)
{
struct dentry *dentry = ERR_PTR(-EEXIST);
*/
lookup_flags &= LOOKUP_REVAL;
- error = do_path_lookup(dfd, pathname, LOOKUP_PARENT|lookup_flags, &nd);
+ error = filename_lookup(dfd, name, LOOKUP_PARENT|lookup_flags, &nd);
if (error)
return ERR_PTR(error);
path_put(&nd.path);
return dentry;
}
+
+struct dentry *kern_path_create(int dfd, const char *pathname,
+ struct path *path, unsigned int lookup_flags)
+{
+ struct filename *filename = getname_kernel(pathname);
+ struct dentry *res;
+
+ if (IS_ERR(filename))
+ return ERR_CAST(filename);
+ res = filename_create(dfd, filename, path, lookup_flags);
+ putname(filename);
+ return res;
+}
EXPORT_SYMBOL(kern_path_create);
void done_path_create(struct path *path, struct dentry *dentry)
struct dentry *res;
if (IS_ERR(tmp))
return ERR_CAST(tmp);
- res = kern_path_create(dfd, tmp->name, path, lookup_flags);
+ res = filename_create(dfd, tmp, path, lookup_flags);
putname(tmp);
return res;
}
projects / linux-2.6-block.git / blobdiff