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