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
   6struct inode;
   7struct dentry;
   8struct iattr;
   9struct super_block;
  10struct nameidata;
  11
  12int reiserfs_xattr_register_handlers(void) __init;
  13void reiserfs_xattr_unregister_handlers(void);
  14int reiserfs_xattr_init(struct super_block *sb, int mount_flags);
  15int reiserfs_lookup_privroot(struct super_block *sb);
  16int reiserfs_delete_xattrs(struct inode *inode);
  17int reiserfs_chown_xattrs(struct inode *inode, struct iattr *attrs);
  18int 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)
  22ssize_t reiserfs_getxattr(struct dentry *dentry, const char *name,
  23                          void *buffer, size_t size);
  24int reiserfs_setxattr(struct dentry *dentry, const char *name,
  25                      const void *value, size_t size, int flags);
  26ssize_t reiserfs_listxattr(struct dentry *dentry, char *buffer, size_t size);
  27int reiserfs_removexattr(struct dentry *dentry, const char *name);
  28
  29int reiserfs_xattr_get(struct inode *, const char *, void *, size_t);
  30int reiserfs_xattr_set(struct inode *, const char *, const void *, size_t, int);
  31int reiserfs_xattr_set_handle(struct reiserfs_transaction_handle *,
  32                              struct inode *, const char *, const void *,
  33                              size_t, int);
  34
  35extern const struct xattr_handler reiserfs_xattr_user_handler;
  36extern const struct xattr_handler reiserfs_xattr_trusted_handler;
  37extern const struct xattr_handler reiserfs_xattr_security_handler;
  38#ifdef CONFIG_REISERFS_FS_SECURITY
  39int reiserfs_security_init(struct inode *dir, struct inode *inode,
  40                           const struct qstr *qstr,
  41                           struct reiserfs_security_handle *sec);
  42int reiserfs_security_write(struct reiserfs_transaction_handle *th,
  43                            struct inode *inode,
  44                            struct reiserfs_security_handle *sec);
  45void reiserfs_security_free(struct reiserfs_security_handle *sec);
  46#endif
  47
  48static 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))
  54static 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/* 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 */
  75static 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 (!REISERFS_SB(inode->i_sb)->xattr_root->d_inode)
  82                        nblocks += JOURNAL_BLOCKS_PER_OBJECT(inode->i_sb);
  83        }
  84
  85        return nblocks;
  86}
  87
  88static 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
 100static inline void reiserfs_init_xattr_rwsem(struct inode *inode)
 101{
 102}
 103#endif  /*  CONFIG_REISERFS_FS_XATTR  */
 104
 105#ifndef CONFIG_REISERFS_FS_SECURITY
 106static 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}
 113static inline int
 114reiserfs_security_write(struct reiserfs_transaction_handle *th,
 115                        struct inode *inode,
 116                        struct reiserfs_security_handle *sec)
 117{
 118        return 0;
 119}
 120static inline void reiserfs_security_free(struct reiserfs_security_handle *sec)
 121{}
 122#endif
 123
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