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Linux/fs/reiserfs/xattr.h

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

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