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