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 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)
  23 ssize_t reiserfs_listxattr(struct dentry *dentry, char *buffer, size_t size);
  24
  25 int reiserfs_xattr_get(struct inode *, const char *, void *, size_t);
  26 int reiserfs_xattr_set(struct inode *, const char *, const void *, size_t, int);
  27 int reiserfs_xattr_set_handle(struct reiserfs_transaction_handle *,
  28                               struct inode *, const char *, const void *,
  29                               size_t, int);
  30
  31 extern const struct xattr_handler reiserfs_xattr_user_handler;
  32 extern const struct xattr_handler reiserfs_xattr_trusted_handler;
  33 extern const struct xattr_handler reiserfs_xattr_security_handler;
  34 #ifdef CONFIG_REISERFS_FS_SECURITY
  35 int reiserfs_security_init(struct inode *dir, struct inode *inode,
  36                            const struct qstr *qstr,
  37                            struct reiserfs_security_handle *sec);
  38 int reiserfs_security_write(struct reiserfs_transaction_handle *th,
  39                             struct inode *inode,
  40                             struct reiserfs_security_handle *sec);
  41 void reiserfs_security_free(struct reiserfs_security_handle *sec);
  42 #endif
  43
  44 static 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))
  50 static 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  */
  72 static 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
  85 static 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
  94 static inline void reiserfs_init_xattr_rwsem(struct inode *inode)
  95 {
  96 }
  97 #endif  /*  CONFIG_REISERFS_FS_XATTR  */
  98
  99 #ifndef CONFIG_REISERFS_FS_SECURITY
 100 static 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 }
 107 static inline int
 108 reiserfs_security_write(struct reiserfs_transaction_handle *th,
 109                         struct inode *inode,
 110                         struct reiserfs_security_handle *sec)
 111 {
 112         return 0;
 113 }
 114 static inline void reiserfs_security_free(struct reiserfs_security_handle *sec)
 115 {}
 116 #endif