fs/reiserfs/xattr.h

   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