xattr.h revision c45ac8887e778c4fa2b572c51a94a681a0955d4d 
1#include <linux/reiserfs_xattr.h>
2#include <linux/init.h>
3#include <linux/list.h>
4#include <linux/rwsem.h>
5#include <linux/reiserfs_fs_i.h>
6#include <linux/reiserfs_fs.h>
7
8struct inode;
9struct dentry;
10struct iattr;
11struct super_block;
12struct nameidata;
13
14int reiserfs_xattr_register_handlers(void) __init;
15void reiserfs_xattr_unregister_handlers(void);
16int reiserfs_xattr_init(struct super_block *sb, int mount_flags);
17int reiserfs_lookup_privroot(struct super_block *sb);
18int reiserfs_delete_xattrs(struct inode *inode);
19int reiserfs_chown_xattrs(struct inode *inode, struct iattr *attrs);
20int reiserfs_permission(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_getxattr(struct dentry *dentry, const char *name,
25			  void *buffer, size_t size);
26int reiserfs_setxattr(struct dentry *dentry, const char *name,
27		      const void *value, size_t size, int flags);
28ssize_t reiserfs_listxattr(struct dentry *dentry, char *buffer, size_t size);
29int reiserfs_removexattr(struct dentry *dentry, const char *name);
30
31int reiserfs_xattr_get(struct inode *, const char *, void *, size_t);
32int reiserfs_xattr_set(struct inode *, const char *, const void *, size_t, int);
33int reiserfs_xattr_set_handle(struct reiserfs_transaction_handle *,
34			      struct inode *, const char *, const void *,
35			      size_t, int);
36
37extern const struct xattr_handler reiserfs_xattr_user_handler;
38extern const struct xattr_handler reiserfs_xattr_trusted_handler;
39extern const struct xattr_handler reiserfs_xattr_security_handler;
40#ifdef CONFIG_REISERFS_FS_SECURITY
41int reiserfs_security_init(struct inode *dir, struct inode *inode,
42			   const struct qstr *qstr,
43			   struct reiserfs_security_handle *sec);
44int reiserfs_security_write(struct reiserfs_transaction_handle *th,
45			    struct inode *inode,
46			    struct reiserfs_security_handle *sec);
47void reiserfs_security_free(struct reiserfs_security_handle *sec);
48#endif
49
50static inline int reiserfs_xattrs_initialized(struct super_block *sb)
51{
52	return REISERFS_SB(sb)->priv_root != NULL;
53}
54
55#define xattr_size(size) ((size) + sizeof(struct reiserfs_xattr_header))
56static inline loff_t reiserfs_xattr_nblocks(struct inode *inode, loff_t size)
57{
58	loff_t ret = 0;
59	if (reiserfs_file_data_log(inode)) {
60		ret = _ROUND_UP(xattr_size(size), inode->i_sb->s_blocksize);
61		ret >>= inode->i_sb->s_blocksize_bits;
62	}
63	return ret;
64}
65
66/* We may have to create up to 3 objects: xattr root, xattr dir, xattr file.
67 * Let's try to be smart about it.
68 * xattr root: We cache it. If it's not cached, we may need to create it.
69 * xattr dir: If anything has been loaded for this inode, we can set a flag
70 *            saying so.
71 * xattr file: Since we don't cache xattrs, we can't tell. We always include
72 *             blocks for it.
73 *
74 * However, since root and dir can be created between calls - YOU MUST SAVE
75 * THIS VALUE.
76 */
77static inline size_t reiserfs_xattr_jcreate_nblocks(struct inode *inode)
78{
79	size_t nblocks = JOURNAL_BLOCKS_PER_OBJECT(inode->i_sb);
80
81	if ((REISERFS_I(inode)->i_flags & i_has_xattr_dir) == 0) {
82		nblocks += JOURNAL_BLOCKS_PER_OBJECT(inode->i_sb);
83		if (!REISERFS_SB(inode->i_sb)->xattr_root->d_inode)
84			nblocks += JOURNAL_BLOCKS_PER_OBJECT(inode->i_sb);
85	}
86
87	return nblocks;
88}
89
90static inline void reiserfs_init_xattr_rwsem(struct inode *inode)
91{
92	init_rwsem(&REISERFS_I(inode)->i_xattr_sem);
93}
94
95#else
96
97#define reiserfs_getxattr NULL
98#define reiserfs_setxattr NULL
99#define reiserfs_listxattr NULL
100#define reiserfs_removexattr NULL
101
102static inline void reiserfs_init_xattr_rwsem(struct inode *inode)
103{
104}
105#endif  /*  CONFIG_REISERFS_FS_XATTR  */
106
107#ifndef CONFIG_REISERFS_FS_SECURITY
108static inline int reiserfs_security_init(struct inode *dir,
109					 struct inode *inode,
110					 const struct qstr *qstr,
111					 struct reiserfs_security_handle *sec)
112{
113	return 0;
114}
115static inline int
116reiserfs_security_write(struct reiserfs_transaction_handle *th,
117			struct inode *inode,
118			struct reiserfs_security_handle *sec)
119{
120	return 0;
121}
122static inline void reiserfs_security_free(struct reiserfs_security_handle *sec)
123{}
124#endif
125