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