1/* SPDX-License-Identifier: GPL-2.0 */
2#include <linux/reiserfs_xattr.h>
3#include <linux/init.h>
4#include <linux/list.h>
5#include <linux/rwsem.h>
6#include <linux/xattr.h>
7
8struct inode;
9struct dentry;
10struct iattr;
11struct super_block;
12
13int reiserfs_xattr_register_handlers(void) __init;
14void reiserfs_xattr_unregister_handlers(void);
15int reiserfs_xattr_init(struct super_block *sb, int mount_flags);
16int reiserfs_lookup_privroot(struct super_block *sb);
17int reiserfs_delete_xattrs(struct inode *inode);
18int reiserfs_chown_xattrs(struct inode *inode, struct iattr *attrs);
19int reiserfs_permission(struct mnt_idmap *idmap,
20			struct inode *inode, int mask);
21
22#ifdef CONFIG_REISERFS_FS_XATTR
23#define has_xattr_dir(inode) (REISERFS_I(inode)->i_flags & i_has_xattr_dir)
24ssize_t reiserfs_listxattr(struct dentry *dentry, char *buffer, size_t size);
25
26int reiserfs_xattr_get(struct inode *, const char *, void *, size_t);
27int reiserfs_xattr_set(struct inode *, const char *, const void *, size_t, int);
28int reiserfs_xattr_set_handle(struct reiserfs_transaction_handle *,
29			      struct inode *, const char *, const void *,
30			      size_t, int);
31
32extern const struct xattr_handler reiserfs_xattr_user_handler;
33extern const struct xattr_handler reiserfs_xattr_trusted_handler;
34extern const struct xattr_handler reiserfs_xattr_security_handler;
35#ifdef CONFIG_REISERFS_FS_SECURITY
36int reiserfs_security_init(struct inode *dir, struct inode *inode,
37			   const struct qstr *qstr,
38			   struct reiserfs_security_handle *sec);
39int reiserfs_security_write(struct reiserfs_transaction_handle *th,
40			    struct inode *inode,
41			    struct reiserfs_security_handle *sec);
42void reiserfs_security_free(struct reiserfs_security_handle *sec);
43#endif
44
45static inline int reiserfs_xattrs_initialized(struct super_block *sb)
46{
47	return REISERFS_SB(sb)->priv_root && REISERFS_SB(sb)->xattr_root;
48}
49
50#define xattr_size(size) ((size) + sizeof(struct reiserfs_xattr_header))
51static inline loff_t reiserfs_xattr_nblocks(struct inode *inode, loff_t size)
52{
53	loff_t ret = 0;
54	if (reiserfs_file_data_log(inode)) {
55		ret = _ROUND_UP(xattr_size(size), inode->i_sb->s_blocksize);
56		ret >>= inode->i_sb->s_blocksize_bits;
57	}
58	return ret;
59}
60
61/*
62 * We may have to create up to 3 objects: xattr root, xattr dir, xattr file.
63 * Let's try to be smart about it.
64 * xattr root: We cache it. If it's not cached, we may need to create it.
65 * xattr dir: If anything has been loaded for this inode, we can set a flag
66 *            saying so.
67 * xattr file: Since we don't cache xattrs, we can't tell. We always include
68 *             blocks for it.
69 *
70 * However, since root and dir can be created between calls - YOU MUST SAVE
71 * THIS VALUE.
72 */
73static inline size_t reiserfs_xattr_jcreate_nblocks(struct inode *inode)
74{
75	size_t nblocks = JOURNAL_BLOCKS_PER_OBJECT(inode->i_sb);
76
77	if ((REISERFS_I(inode)->i_flags & i_has_xattr_dir) == 0) {
78		nblocks += JOURNAL_BLOCKS_PER_OBJECT(inode->i_sb);
79		if (d_really_is_negative(REISERFS_SB(inode->i_sb)->xattr_root))
80			nblocks += JOURNAL_BLOCKS_PER_OBJECT(inode->i_sb);
81	}
82
83	return nblocks;
84}
85
86static inline void reiserfs_init_xattr_rwsem(struct inode *inode)
87{
88	init_rwsem(&REISERFS_I(inode)->i_xattr_sem);
89}
90
91#else
92
93#define reiserfs_listxattr NULL
94
95static inline void reiserfs_init_xattr_rwsem(struct inode *inode)
96{
97}
98#endif  /*  CONFIG_REISERFS_FS_XATTR  */
99
100#ifndef CONFIG_REISERFS_FS_SECURITY
101static inline int reiserfs_security_init(struct inode *dir,
102					 struct inode *inode,
103					 const struct qstr *qstr,
104					 struct reiserfs_security_handle *sec)
105{
106	return 0;
107}
108static inline int
109reiserfs_security_write(struct reiserfs_transaction_handle *th,
110			struct inode *inode,
111			struct reiserfs_security_handle *sec)
112{
113	return 0;
114}
115static inline void reiserfs_security_free(struct reiserfs_security_handle *sec)
116{}
117#endif
118