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39f60c1cce
Convert to struct mnt_idmap.
Last cycle we merged the necessary infrastructure in
256c8aed2b ("fs: introduce dedicated idmap type for mounts").
This is just the conversion to struct mnt_idmap.
Currently we still pass around the plain namespace that was attached to a
mount. This is in general pretty convenient but it makes it easy to
conflate namespaces that are relevant on the filesystem with namespaces
that are relevent on the mount level. Especially for non-vfs developers
without detailed knowledge in this area this can be a potential source for
bugs.
Once the conversion to struct mnt_idmap is done all helpers down to the
really low-level helpers will take a struct mnt_idmap argument instead of
two namespace arguments. This way it becomes impossible to conflate the two
eliminating the possibility of any bugs. All of the vfs and all filesystems
only operate on struct mnt_idmap.
Acked-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Christian Brauner (Microsoft) <brauner@kernel.org>
113 lines
3.7 KiB
C
113 lines
3.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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File: linux/xattr.h
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Extended attributes handling.
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Copyright (C) 2001 by Andreas Gruenbacher <a.gruenbacher@computer.org>
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Copyright (c) 2001-2002 Silicon Graphics, Inc. All Rights Reserved.
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Copyright (c) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com>
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*/
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#ifndef _LINUX_XATTR_H
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#define _LINUX_XATTR_H
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#include <linux/slab.h>
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#include <linux/types.h>
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#include <linux/spinlock.h>
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#include <linux/mm.h>
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#include <linux/user_namespace.h>
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#include <uapi/linux/xattr.h>
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struct inode;
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struct dentry;
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static inline bool is_posix_acl_xattr(const char *name)
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{
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return (strcmp(name, XATTR_NAME_POSIX_ACL_ACCESS) == 0) ||
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(strcmp(name, XATTR_NAME_POSIX_ACL_DEFAULT) == 0);
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}
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/*
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* struct xattr_handler: When @name is set, match attributes with exactly that
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* name. When @prefix is set instead, match attributes with that prefix and
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* with a non-empty suffix.
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*/
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struct xattr_handler {
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const char *name;
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const char *prefix;
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int flags; /* fs private flags */
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bool (*list)(struct dentry *dentry);
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int (*get)(const struct xattr_handler *, struct dentry *dentry,
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struct inode *inode, const char *name, void *buffer,
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size_t size);
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int (*set)(const struct xattr_handler *,
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struct mnt_idmap *idmap, struct dentry *dentry,
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struct inode *inode, const char *name, const void *buffer,
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size_t size, int flags);
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};
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const char *xattr_full_name(const struct xattr_handler *, const char *);
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struct xattr {
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const char *name;
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void *value;
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size_t value_len;
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};
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ssize_t __vfs_getxattr(struct dentry *, struct inode *, const char *, void *, size_t);
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ssize_t vfs_getxattr(struct mnt_idmap *, struct dentry *, const char *,
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void *, size_t);
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ssize_t vfs_listxattr(struct dentry *d, char *list, size_t size);
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int __vfs_setxattr(struct mnt_idmap *, struct dentry *, struct inode *,
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const char *, const void *, size_t, int);
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int __vfs_setxattr_noperm(struct mnt_idmap *, struct dentry *,
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const char *, const void *, size_t, int);
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int __vfs_setxattr_locked(struct mnt_idmap *, struct dentry *,
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const char *, const void *, size_t, int,
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struct inode **);
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int vfs_setxattr(struct mnt_idmap *, struct dentry *, const char *,
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const void *, size_t, int);
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int __vfs_removexattr(struct mnt_idmap *, struct dentry *, const char *);
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int __vfs_removexattr_locked(struct mnt_idmap *, struct dentry *,
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const char *, struct inode **);
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int vfs_removexattr(struct mnt_idmap *, struct dentry *, const char *);
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ssize_t generic_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size);
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int vfs_getxattr_alloc(struct mnt_idmap *idmap,
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struct dentry *dentry, const char *name,
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char **xattr_value, size_t size, gfp_t flags);
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int xattr_supported_namespace(struct inode *inode, const char *prefix);
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static inline const char *xattr_prefix(const struct xattr_handler *handler)
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{
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return handler->prefix ?: handler->name;
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}
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struct simple_xattrs {
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struct rb_root rb_root;
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rwlock_t lock;
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};
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struct simple_xattr {
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struct rb_node rb_node;
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char *name;
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size_t size;
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char value[];
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};
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void simple_xattrs_init(struct simple_xattrs *xattrs);
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void simple_xattrs_free(struct simple_xattrs *xattrs);
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struct simple_xattr *simple_xattr_alloc(const void *value, size_t size);
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int simple_xattr_get(struct simple_xattrs *xattrs, const char *name,
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void *buffer, size_t size);
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int simple_xattr_set(struct simple_xattrs *xattrs, const char *name,
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const void *value, size_t size, int flags,
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ssize_t *removed_size);
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ssize_t simple_xattr_list(struct inode *inode, struct simple_xattrs *xattrs,
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char *buffer, size_t size);
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void simple_xattr_add(struct simple_xattrs *xattrs,
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struct simple_xattr *new_xattr);
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#endif /* _LINUX_XATTR_H */
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