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