struct qstr last;
struct path root;
struct inode *inode; /* path.dentry.d_inode */
- unsigned int flags;
+ unsigned int flags, state;
unsigned seq, m_seq, r_seq;
int last_type;
unsigned depth;
umode_t dir_mode;
} __randomize_layout;
-static void set_nameidata(struct nameidata *p, int dfd, struct filename *name)
+#define ND_ROOT_PRESET 1
+#define ND_ROOT_GRABBED 2
+#define ND_JUMPED 4
+
+static void __set_nameidata(struct nameidata *p, int dfd, struct filename *name)
{
struct nameidata *old = current->nameidata;
p->stack = p->internal;
+ p->depth = 0;
p->dfd = dfd;
p->name = name;
p->path.mnt = NULL;
current->nameidata = p;
}
+static inline void set_nameidata(struct nameidata *p, int dfd, struct filename *name,
+ const struct path *root)
+{
+ __set_nameidata(p, dfd, name);
+ p->state = 0;
+ if (unlikely(root)) {
+ p->state = ND_ROOT_PRESET;
+ p->root = *root;
+ }
+}
+
static void restore_nameidata(void)
{
struct nameidata *now = current->nameidata, *old = now->saved;
path_put(&nd->path);
for (i = 0; i < nd->depth; i++)
path_put(&nd->stack[i].link);
- if (nd->flags & LOOKUP_ROOT_GRABBED) {
+ if (nd->state & ND_ROOT_GRABBED) {
path_put(&nd->root);
- nd->flags &= ~LOOKUP_ROOT_GRABBED;
+ nd->state &= ~ND_ROOT_GRABBED;
}
} else {
nd->flags &= ~LOOKUP_RCU;
if (!nd->root.mnt && (nd->flags & LOOKUP_IS_SCOPED))
return false;
/* Nothing to do if nd->root is zero or is managed by the VFS user. */
- if (!nd->root.mnt || (nd->flags & LOOKUP_ROOT))
+ if (!nd->root.mnt || (nd->state & ND_ROOT_PRESET))
return true;
- nd->flags |= LOOKUP_ROOT_GRABBED;
+ nd->state |= ND_ROOT_GRABBED;
return legitimize_path(nd, &nd->root, nd->root_seq);
}
* We don't want to zero nd->root for scoped-lookups or
* externally-managed nd->root.
*/
- if (!(nd->flags & (LOOKUP_ROOT | LOOKUP_IS_SCOPED)))
- nd->root.mnt = NULL;
+ if (!(nd->state & ND_ROOT_PRESET))
+ if (!(nd->flags & LOOKUP_IS_SCOPED))
+ nd->root.mnt = NULL;
nd->flags &= ~LOOKUP_CACHED;
if (!try_to_unlazy(nd))
return -ECHILD;
return -EXDEV;
}
- if (likely(!(nd->flags & LOOKUP_JUMPED)))
+ if (likely(!(nd->state & ND_JUMPED)))
return 0;
if (likely(!(dentry->d_flags & DCACHE_OP_WEAK_REVALIDATE)))
} while (read_seqcount_retry(&fs->seq, seq));
} else {
get_fs_root(fs, &nd->root);
- nd->flags |= LOOKUP_ROOT_GRABBED;
+ nd->state |= ND_ROOT_GRABBED;
}
return 0;
}
path_get(&nd->path);
nd->inode = nd->path.dentry->d_inode;
}
- nd->flags |= LOOKUP_JUMPED;
+ nd->state |= ND_JUMPED;
return 0;
}
path_put(&nd->path);
nd->path = *path;
nd->inode = nd->path.dentry->d_inode;
- nd->flags |= LOOKUP_JUMPED;
+ nd->state |= ND_JUMPED;
return 0;
err:
* should be allowed, or not, on files that already
* exist.
* @mnt_userns: user namespace of the mount the inode was found from
- * @dir_mode: mode bits of directory
- * @dir_uid: owner of directory
+ * @nd: nameidata pathwalk data
* @inode: the inode of the file to open
*
* Block an O_CREAT open of a FIFO (or a regular file) when:
if (mounted) {
path->mnt = &mounted->mnt;
dentry = path->dentry = mounted->mnt.mnt_root;
- nd->flags |= LOOKUP_JUMPED;
+ nd->state |= ND_JUMPED;
*seqp = read_seqcount_begin(&dentry->d_seq);
*inode = dentry->d_inode;
/*
if (unlikely(nd->flags & LOOKUP_NO_XDEV))
ret = -EXDEV;
else
- nd->flags |= LOOKUP_JUMPED;
+ nd->state |= ND_JUMPED;
}
if (unlikely(ret)) {
dput(path->dentry);
case 2:
if (name[1] == '.') {
type = LAST_DOTDOT;
- nd->flags |= LOOKUP_JUMPED;
+ nd->state |= ND_JUMPED;
}
break;
case 1:
}
if (likely(type == LAST_NORM)) {
struct dentry *parent = nd->path.dentry;
- nd->flags &= ~LOOKUP_JUMPED;
+ nd->state &= ~ND_JUMPED;
if (unlikely(parent->d_flags & DCACHE_OP_HASH)) {
struct qstr this = { { .hash_len = hash_len }, .name = name };
err = parent->d_op->d_hash(parent, &this);
if (flags & LOOKUP_RCU)
rcu_read_lock();
- nd->flags = flags | LOOKUP_JUMPED;
- nd->depth = 0;
+ nd->flags = flags;
+ nd->state |= ND_JUMPED;
nd->m_seq = __read_seqcount_begin(&mount_lock.seqcount);
nd->r_seq = __read_seqcount_begin(&rename_lock.seqcount);
smp_rmb();
- if (flags & LOOKUP_ROOT) {
+ if (nd->state & ND_ROOT_PRESET) {
struct dentry *root = nd->root.dentry;
struct inode *inode = root->d_inode;
if (*s && unlikely(!d_can_lookup(root)))
nd->root_seq = nd->seq;
} else {
path_get(&nd->root);
- nd->flags |= LOOKUP_ROOT_GRABBED;
+ nd->state |= ND_ROOT_GRABBED;
}
}
return s;
;
if (!err && unlikely(nd->flags & LOOKUP_MOUNTPOINT)) {
err = handle_lookup_down(nd);
- nd->flags &= ~LOOKUP_JUMPED; // no d_weak_revalidate(), please...
+ nd->state &= ~ND_JUMPED; // no d_weak_revalidate(), please...
}
if (!err)
err = complete_walk(nd);
struct nameidata nd;
if (IS_ERR(name))
return PTR_ERR(name);
- if (unlikely(root)) {
- nd.root = *root;
- flags |= LOOKUP_ROOT;
- }
- set_nameidata(&nd, dfd, name);
+ set_nameidata(&nd, dfd, name, root);
retval = path_lookupat(&nd, flags | LOOKUP_RCU, path);
if (unlikely(retval == -ECHILD))
retval = path_lookupat(&nd, flags, path);
if (IS_ERR(name))
return name;
- set_nameidata(&nd, dfd, name);
+ set_nameidata(&nd, dfd, name, NULL);
retval = path_parentat(&nd, flags | LOOKUP_RCU, parent);
if (unlikely(retval == -ECHILD))
retval = path_parentat(&nd, flags, parent);
static inline int may_create(struct user_namespace *mnt_userns,
struct inode *dir, struct dentry *child)
{
- struct user_namespace *s_user_ns;
audit_inode_child(dir, child, AUDIT_TYPE_CHILD_CREATE);
if (child->d_inode)
return -EEXIST;
if (IS_DEADDIR(dir))
return -ENOENT;
- s_user_ns = dir->i_sb->s_user_ns;
- if (!kuid_has_mapping(s_user_ns, fsuid_into_mnt(mnt_userns)) ||
- !kgid_has_mapping(s_user_ns, fsgid_into_mnt(mnt_userns)))
+ if (!fsuidgid_has_mapping(dir->i_sb, mnt_userns))
return -EOVERFLOW;
+
return inode_permission(mnt_userns, dir, MAY_WRITE | MAY_EXEC);
}
const struct path *dir, struct dentry *dentry,
umode_t mode)
{
- struct user_namespace *s_user_ns;
int error = security_path_mknod(dir, dentry, mode, 0);
if (error)
return error;
- s_user_ns = dir->dentry->d_sb->s_user_ns;
- if (!kuid_has_mapping(s_user_ns, fsuid_into_mnt(mnt_userns)) ||
- !kgid_has_mapping(s_user_ns, fsgid_into_mnt(mnt_userns)))
+ if (!fsuidgid_has_mapping(dir->dentry->d_sb, mnt_userns))
return -EOVERFLOW;
error = inode_permission(mnt_userns, dir->dentry->d_inode,
* @mnt_userns: user namespace of the mount the inode was found from
* @dentry: pointer to dentry of the base directory
* @mode: mode of the new tmpfile
- * @open_flags: flags
+ * @open_flag: flags
*
* Create a temporary file.
*
int flags = op->lookup_flags;
struct file *filp;
- set_nameidata(&nd, dfd, pathname);
+ set_nameidata(&nd, dfd, pathname, NULL);
filp = path_openat(&nd, op, flags | LOOKUP_RCU);
if (unlikely(filp == ERR_PTR(-ECHILD)))
filp = path_openat(&nd, op, flags);
return filp;
}
-struct file *do_file_open_root(struct dentry *dentry, struct vfsmount *mnt,
+struct file *do_file_open_root(const struct path *root,
const char *name, const struct open_flags *op)
{
struct nameidata nd;
struct file *file;
struct filename *filename;
- int flags = op->lookup_flags | LOOKUP_ROOT;
-
- nd.root.mnt = mnt;
- nd.root.dentry = dentry;
+ int flags = op->lookup_flags;
- if (d_is_symlink(dentry) && op->intent & LOOKUP_OPEN)
+ if (d_is_symlink(root->dentry) && op->intent & LOOKUP_OPEN)
return ERR_PTR(-ELOOP);
filename = getname_kernel(name);
if (IS_ERR(filename))
return ERR_CAST(filename);
- set_nameidata(&nd, -1, filename);
+ set_nameidata(&nd, -1, filename, root);
file = path_openat(&nd, op, flags | LOOKUP_RCU);
if (unlikely(file == ERR_PTR(-ECHILD)))
file = path_openat(&nd, op, flags);
/**
* vfs_rename - rename a filesystem object
- * @old_mnt_userns: old user namespace of the mount the inode was found from
- * @old_dir: parent of source
- * @old_dentry: source
- * @new_mnt_userns: new user namespace of the mount the inode was found from
- * @new_dir: parent of destination
- * @new_dentry: destination
- * @delegated_inode: returns an inode needing a delegation break
- * @flags: rename flags
+ * @rd: pointer to &struct renamedata info
*
* The caller must hold multiple mutexes--see lock_rename()).
*
projects / linux-2.6-microblaze.git / blobdiff