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
   8 struct inode;
   9 struct dentry;
  10 struct iattr;
  11 struct super_block;
  12
  13 int reiserfs_xattr_register_handlers(void) __init;
  14 void reiserfs_xattr_unregister_handlers(void);
  15 int reiserfs_xattr_init(struct super_block *sb, int mount_flags);
  16 int reiserfs_lookup_privroot(struct super_block *sb);
  17 int reiserfs_delete_xattrs(struct inode *inode);
  18 int reiserfs_chown_xattrs(struct inode *inode, struct iattr *attrs);
  19 int 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)
  24 ssize_t reiserfs_listxattr(struct dentry *dentry, char *buffer, size_t size);
  25
  26 int reiserfs_xattr_get(struct inode *, const char *, void *, size_t);
  27 int reiserfs_xattr_set(struct inode *, const char *, const void *, size_t, int);
  28 int reiserfs_xattr_set_handle(struct reiserfs_transaction_handle *,
  29                               struct inode *, const char *, const void *,
  30                               size_t, int);
  31
  32 extern const struct xattr_handler reiserfs_xattr_user_handler;
  33 extern const struct xattr_handler reiserfs_xattr_trusted_handler;
  34 extern const struct xattr_handler reiserfs_xattr_security_handler;
  35 #ifdef CONFIG_REISERFS_FS_SECURITY
  36 int reiserfs_security_init(struct inode *dir, struct inode *inode,
  37                            const struct qstr *qstr,
  38                            struct reiserfs_security_handle *sec);
  39 int reiserfs_security_write(struct reiserfs_transaction_handle *th,
  40                             struct inode *inode,
  41                             struct reiserfs_security_handle *sec);
  42 void reiserfs_security_free(struct reiserfs_security_handle *sec);
  43 #endif
  44
  45 static 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))
  51 static 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  */
  73 static 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
  86 static 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
  95 static inline void reiserfs_init_xattr_rwsem(struct inode *inode)
  96 {
  97 }
  98 #endif  /*  CONFIG_REISERFS_FS_XATTR  */
  99
 100 #ifndef CONFIG_REISERFS_FS_SECURITY
 101 static 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 }
 108 static inline int
 109 reiserfs_security_write(struct reiserfs_transaction_handle *th,
 110                         struct inode *inode,
 111                         struct reiserfs_security_handle *sec)
 112 {
 113         return 0;
 114 }
 115 static inline void reiserfs_security_free(struct reiserfs_security_handle *sec)
 116 {}
 117 #endif