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
8 struct inode;
9 struct dentry;
10 struct iattr;
11 struct super_block;
12
13 int reiserfs_xattr_register_handlers(void) __init;
14 void reiserfs_xattr_unregister_handlers(void);
15 int reiserfs_xattr_init(struct super_block *sb, int mount_flags);
16 int reiserfs_lookup_privroot(struct super_block *sb);
17 int reiserfs_delete_xattrs(struct inode *inode);
18 int reiserfs_chown_xattrs(struct inode *inode, struct iattr *attrs);
19 int 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)
24 ssize_t reiserfs_listxattr(struct dentry *dentry, char *buffer, size_t size);
25
26 int reiserfs_xattr_get(struct inode *, const char *, void *, size_t);
27 int reiserfs_xattr_set(struct inode *, const char *, const void *, size_t, int);
28 int reiserfs_xattr_set_handle(struct reiserfs_transaction_handle *,
29 struct inode *, const char *, const void *,
30 size_t, int);
31
32 extern const struct xattr_handler reiserfs_xattr_user_handler;
33 extern const struct xattr_handler reiserfs_xattr_trusted_handler;
34 extern const struct xattr_handler reiserfs_xattr_security_handler;
35 #ifdef CONFIG_REISERFS_FS_SECURITY
36 int reiserfs_security_init(struct inode *dir, struct inode *inode,
37 const struct qstr *qstr,
38 struct reiserfs_security_handle *sec);
39 int reiserfs_security_write(struct reiserfs_transaction_handle *th,
40 struct inode *inode,
41 struct reiserfs_security_handle *sec);
42 void reiserfs_security_free(struct reiserfs_security_handle *sec);
43 #endif
44
45 static 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))
51 static 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 */
73 static 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
86 static 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
95 static inline void reiserfs_init_xattr_rwsem(struct inode *inode)
96 {
97 }
98 #endif /* CONFIG_REISERFS_FS_XATTR */
99
100 #ifndef CONFIG_REISERFS_FS_SECURITY
101 static 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 }
108 static inline int
109 reiserfs_security_write(struct reiserfs_transaction_handle *th,
110 struct inode *inode,
111 struct reiserfs_security_handle *sec)
112 {
113 return 0;
114 }
115 static inline void reiserfs_security_free(struct reiserfs_security_handle *sec)
116 {}
117 #endif
118
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