LXR linux/fs/reiserfs/xattr.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2#include <linux/reiserfs_xattr.h>
   3#include <linux/init.h>
   4#include <linux/list.h>
   5#include <linux/rwsem.h>
   6#include <linux/xattr.h>
   7
   8struct inode;
   9struct dentry;
  10struct iattr;
  11struct super_block;
  12
  13int reiserfs_xattr_register_handlers(void) __init;
  14void reiserfs_xattr_unregister_handlers(void);
  15int reiserfs_xattr_init(struct super_block *sb, int mount_flags);
  16int reiserfs_lookup_privroot(struct super_block *sb);
  17int reiserfs_delete_xattrs(struct inode *inode);
  18int reiserfs_chown_xattrs(struct inode *inode, struct iattr *attrs);
  19int reiserfs_permission(struct user_namespace *mnt_userns,
  20                        struct inode *inode, int mask);
  21
  22#ifdef CONFIG_REISERFS_FS_XATTR
  23#define has_xattr_dir(inode) (REISERFS_I(inode)->i_flags & i_has_xattr_dir)
  24ssize_t reiserfs_listxattr(struct dentry *dentry, char *buffer, size_t size);
  25
  26int reiserfs_xattr_get(struct inode *, const char *, void *, size_t);
  27int reiserfs_xattr_set(struct inode *, const char *, const void *, size_t, int);
  28int reiserfs_xattr_set_handle(struct reiserfs_transaction_handle *,
  29                              struct inode *, const char *, const void *,
  30                              size_t, int);
  31
  32extern const struct xattr_handler reiserfs_xattr_user_handler;
  33extern const struct xattr_handler reiserfs_xattr_trusted_handler;
  34extern const struct xattr_handler reiserfs_xattr_security_handler;
  35#ifdef CONFIG_REISERFS_FS_SECURITY
  36int reiserfs_security_init(struct inode *dir, struct inode *inode,
  37                           const struct qstr *qstr,
  38                           struct reiserfs_security_handle *sec);
  39int reiserfs_security_write(struct reiserfs_transaction_handle *th,
  40                            struct inode *inode,
  41                            struct reiserfs_security_handle *sec);
  42void reiserfs_security_free(struct reiserfs_security_handle *sec);
  43#endif
  44
  45static inline int reiserfs_xattrs_initialized(struct super_block *sb)
  46{
  47        return REISERFS_SB(sb)->priv_root && REISERFS_SB(sb)->xattr_root;
  48}
  49
  50#define xattr_size(size) ((size) + sizeof(struct reiserfs_xattr_header))
  51static inline loff_t reiserfs_xattr_nblocks(struct inode *inode, loff_t size)
  52{
  53        loff_t ret = 0;
  54        if (reiserfs_file_data_log(inode)) {
  55                ret = _ROUND_UP(xattr_size(size), inode->i_sb->s_blocksize);
  56                ret >>= inode->i_sb->s_blocksize_bits;
  57        }
  58        return ret;
  59}
  60
  61/*
  62 * We may have to create up to 3 objects: xattr root, xattr dir, xattr file.
  63 * Let's try to be smart about it.
  64 * xattr root: We cache it. If it's not cached, we may need to create it.
  65 * xattr dir: If anything has been loaded for this inode, we can set a flag
  66 *            saying so.
  67 * xattr file: Since we don't cache xattrs, we can't tell. We always include
  68 *             blocks for it.
  69 *
  70 * However, since root and dir can be created between calls - YOU MUST SAVE
  71 * THIS VALUE.
  72 */
  73static inline size_t reiserfs_xattr_jcreate_nblocks(struct inode *inode)
  74{
  75        size_t nblocks = JOURNAL_BLOCKS_PER_OBJECT(inode->i_sb);
  76
  77        if ((REISERFS_I(inode)->i_flags & i_has_xattr_dir) == 0) {
  78                nblocks += JOURNAL_BLOCKS_PER_OBJECT(inode->i_sb);
  79                if (d_really_is_negative(REISERFS_SB(inode->i_sb)->xattr_root))
  80                        nblocks += JOURNAL_BLOCKS_PER_OBJECT(inode->i_sb);
  81        }
  82
  83        return nblocks;
  84}
  85
  86static inline void reiserfs_init_xattr_rwsem(struct inode *inode)
  87{
  88        init_rwsem(&REISERFS_I(inode)->i_xattr_sem);
  89}
  90
  91#else
  92
  93#define reiserfs_listxattr NULL
  94
  95static inline void reiserfs_init_xattr_rwsem(struct inode *inode)
  96{
  97}
  98#endif  /*  CONFIG_REISERFS_FS_XATTR  */
  99
 100#ifndef CONFIG_REISERFS_FS_SECURITY
 101static inline int reiserfs_security_init(struct inode *dir,
 102                                         struct inode *inode,
 103                                         const struct qstr *qstr,
 104                                         struct reiserfs_security_handle *sec)
 105{
 106        return 0;
 107}
 108static inline int
 109reiserfs_security_write(struct reiserfs_transaction_handle *th,
 110                        struct inode *inode,
 111                        struct reiserfs_security_handle *sec)
 112{
 113        return 0;
 114}
 115static inline void reiserfs_security_free(struct reiserfs_security_handle *sec)
 116{}
 117#endif
 118