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7743532277
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>
160 lines
4.1 KiB
C
160 lines
4.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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File: linux/posix_acl.h
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(C) 2002 Andreas Gruenbacher, <a.gruenbacher@computer.org>
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*/
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#ifndef __LINUX_POSIX_ACL_H
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#define __LINUX_POSIX_ACL_H
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#include <linux/bug.h>
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#include <linux/slab.h>
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#include <linux/rcupdate.h>
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#include <linux/refcount.h>
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#include <uapi/linux/posix_acl.h>
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struct user_namespace;
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struct posix_acl_entry {
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short e_tag;
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unsigned short e_perm;
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union {
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kuid_t e_uid;
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kgid_t e_gid;
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};
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};
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struct posix_acl {
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refcount_t a_refcount;
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struct rcu_head a_rcu;
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unsigned int a_count;
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struct posix_acl_entry a_entries[];
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};
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#define FOREACH_ACL_ENTRY(pa, acl, pe) \
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for(pa=(acl)->a_entries, pe=pa+(acl)->a_count; pa<pe; pa++)
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/*
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* Duplicate an ACL handle.
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*/
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static inline struct posix_acl *
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posix_acl_dup(struct posix_acl *acl)
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{
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if (acl)
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refcount_inc(&acl->a_refcount);
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return acl;
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}
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/*
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* Free an ACL handle.
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*/
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static inline void
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posix_acl_release(struct posix_acl *acl)
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{
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if (acl && refcount_dec_and_test(&acl->a_refcount))
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kfree_rcu(acl, a_rcu);
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}
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/* posix_acl.c */
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extern void posix_acl_init(struct posix_acl *, int);
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extern struct posix_acl *posix_acl_alloc(int, gfp_t);
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extern struct posix_acl *posix_acl_from_mode(umode_t, gfp_t);
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extern int posix_acl_equiv_mode(const struct posix_acl *, umode_t *);
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extern int __posix_acl_create(struct posix_acl **, gfp_t, umode_t *);
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extern int __posix_acl_chmod(struct posix_acl **, gfp_t, umode_t);
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extern struct posix_acl *get_posix_acl(struct inode *, int);
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int set_posix_acl(struct user_namespace *, struct dentry *, int,
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struct posix_acl *);
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struct posix_acl *get_cached_acl_rcu(struct inode *inode, int type);
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struct posix_acl *posix_acl_clone(const struct posix_acl *acl, gfp_t flags);
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#ifdef CONFIG_FS_POSIX_ACL
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int posix_acl_chmod(struct user_namespace *, struct dentry *, umode_t);
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extern int posix_acl_create(struct inode *, umode_t *, struct posix_acl **,
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struct posix_acl **);
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int posix_acl_update_mode(struct user_namespace *, struct inode *, umode_t *,
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struct posix_acl **);
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int simple_set_acl(struct user_namespace *, struct dentry *,
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struct posix_acl *, int);
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extern int simple_acl_create(struct inode *, struct inode *);
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struct posix_acl *get_cached_acl(struct inode *inode, int type);
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void set_cached_acl(struct inode *inode, int type, struct posix_acl *acl);
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void forget_cached_acl(struct inode *inode, int type);
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void forget_all_cached_acls(struct inode *inode);
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int posix_acl_valid(struct user_namespace *, const struct posix_acl *);
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int posix_acl_permission(struct user_namespace *, struct inode *,
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const struct posix_acl *, int);
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static inline void cache_no_acl(struct inode *inode)
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{
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inode->i_acl = NULL;
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inode->i_default_acl = NULL;
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}
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int vfs_set_acl(struct user_namespace *mnt_userns, struct dentry *dentry,
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const char *acl_name, struct posix_acl *kacl);
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struct posix_acl *vfs_get_acl(struct mnt_idmap *idmap,
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struct dentry *dentry, const char *acl_name);
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int vfs_remove_acl(struct user_namespace *mnt_userns, struct dentry *dentry,
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const char *acl_name);
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#else
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static inline int posix_acl_chmod(struct user_namespace *mnt_userns,
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struct dentry *dentry, umode_t mode)
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{
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return 0;
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}
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#define simple_set_acl NULL
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static inline int simple_acl_create(struct inode *dir, struct inode *inode)
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{
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return 0;
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}
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static inline void cache_no_acl(struct inode *inode)
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{
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}
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static inline int posix_acl_create(struct inode *inode, umode_t *mode,
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struct posix_acl **default_acl, struct posix_acl **acl)
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{
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*default_acl = *acl = NULL;
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return 0;
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}
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static inline void forget_all_cached_acls(struct inode *inode)
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{
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}
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static inline int vfs_set_acl(struct user_namespace *mnt_userns,
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struct dentry *dentry, const char *name,
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struct posix_acl *acl)
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{
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return -EOPNOTSUPP;
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}
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static inline struct posix_acl *vfs_get_acl(struct mnt_idmap *idmap,
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struct dentry *dentry,
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const char *acl_name)
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{
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return ERR_PTR(-EOPNOTSUPP);
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}
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static inline int vfs_remove_acl(struct user_namespace *mnt_userns,
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struct dentry *dentry, const char *acl_name)
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{
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return -EOPNOTSUPP;
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}
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#endif /* CONFIG_FS_POSIX_ACL */
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struct posix_acl *get_inode_acl(struct inode *inode, int type);
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#endif /* __LINUX_POSIX_ACL_H */
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