The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/fs/ext2fs/ext2_extattr.h

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2017, Fedor Uporov
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  *
   28  * $FreeBSD$
   29  */
   30 
   31 #ifndef _FS_EXT2FS_EXT2_EXTARTTR_H_
   32 #define _FS_EXT2FS_EXT2_EXTARTTR_H_
   33 
   34 /* Linux xattr name indexes */
   35 #define EXT4_XATTR_INDEX_USER                   1
   36 #define EXT4_XATTR_INDEX_POSIX_ACL_ACCESS       2
   37 #define EXT4_XATTR_INDEX_POSIX_ACL_DEFAULT      3
   38 #define EXT4_XATTR_INDEX_TRUSTED                4
   39 #define EXT4_XATTR_INDEX_LUSTRE                 5
   40 #define EXT4_XATTR_INDEX_SECURITY               6
   41 #define EXT4_XATTR_INDEX_SYSTEM                 7
   42 #define EXT4_XATTR_INDEX_RICHACL                8
   43 #define EXT4_XATTR_INDEX_ENCRYPTION             9
   44 
   45 /* Magic value in attribute blocks */
   46 #define EXTATTR_MAGIC 0xEA020000
   47 
   48 /* Max EA name length */
   49 #define EXT2_EXTATTR_NAMELEN_MAX                255
   50 
   51 /* EA hash constants */
   52 #define EXT2_EXTATTR_NAME_HASH_SHIFT            5
   53 #define EXT2_EXTATTR_VALUE_HASH_SHIFT           16
   54 #define EXT2_EXTATTR_BLOCK_HASH_SHIFT           16
   55 
   56 struct ext2fs_extattr_header {
   57         int32_t h_magic;        /* magic number for identification */
   58         int32_t h_refcount;     /* reference count */
   59         int32_t h_blocks;       /* number of disk blocks used */
   60         int32_t h_hash;         /* hash value of all attributes */
   61         int32_t h_checksum;     /* crc32c(uuid+id+xattrblock) */
   62                                 /* id = inum if refcount=1, blknum otherwise */
   63         uint32_t h_reserved[3]; /* zero right now */
   64 };
   65 
   66 struct ext2fs_extattr_dinode_header {
   67         int32_t h_magic;        /* magic number for identification */
   68 };
   69 
   70 struct ext2fs_extattr_entry {
   71         uint8_t e_name_len;             /* length of name */
   72         uint8_t e_name_index;           /* attribute name index */
   73         uint16_t        e_value_offs;   /* offset in disk block of value */
   74         uint32_t        e_value_block;  /* disk block attribute is stored on (n/i) */
   75         uint32_t        e_value_size;   /* size of attribute value */
   76         uint32_t        e_hash;         /* hash value of name and value */
   77         char    e_name[0];              /* attribute name */
   78 };
   79 
   80 #define EXT2_IFIRST(hdr) ((struct ext2fs_extattr_entry *)((hdr)+1))
   81 
   82 #define EXT2_HDR(bh) ((struct ext2fs_extattr_header *)((bh)->b_data))
   83 #define EXT2_ENTRY(ptr) ((struct ext2fs_extattr_entry *)(ptr))
   84 #define EXT2_FIRST_ENTRY(bh) EXT2_ENTRY(EXT2_HDR(bh)+1)
   85 #define EXT2_IS_LAST_ENTRY(entry) (*(uint32_t *)(entry) == 0)
   86 
   87 #define EXT2_EXTATTR_PAD_BITS           2
   88 #define EXT2_EXTATTR_PAD                (1<<EXT2_EXTATTR_PAD_BITS)
   89 #define EXT2_EXTATTR_ROUND              (EXT2_EXTATTR_PAD-1)
   90 #define EXT2_EXTATTR_LEN(name_len) \
   91         (((name_len) + EXT2_EXTATTR_ROUND + \
   92             sizeof(struct ext2fs_extattr_entry)) & ~EXT2_EXTATTR_ROUND)
   93 
   94 #define EXT2_EXTATTR_SIZE(size) \
   95     (((size) + EXT2_EXTATTR_ROUND) & ~EXT2_EXTATTR_ROUND)
   96 
   97 #define EXT2_EXTATTR_NEXT(entry) \
   98         ( (struct ext2fs_extattr_entry *)( \
   99             (char *)(entry) + EXT2_EXTATTR_LEN((entry)->e_name_len)) )
  100 
  101 int ext2_extattr_inode_delete(struct inode *ip, int attrnamespace,
  102     const char *name);
  103 
  104 int ext2_extattr_block_delete(struct inode *ip, int attrnamespace,
  105     const char *name);
  106 
  107 int ext2_extattr_free(struct inode *ip);
  108 int ext2_extattr_inode_list(struct inode *ip, int attrnamespace,
  109     struct uio *uio, size_t *size);
  110 
  111 int ext2_extattr_block_list(struct inode *ip, int attrnamespace,
  112     struct uio *uio, size_t *size);
  113 
  114 int ext2_extattr_inode_get(struct inode *ip, int attrnamespace,
  115     const char *name, struct uio *uio, size_t *size);
  116 
  117 int ext2_extattr_block_get(struct inode *ip, int attrnamespace,
  118     const char *name, struct uio *uio, size_t *size);
  119 
  120 int ext2_extattr_inode_set(struct inode *ip, int attrnamespace,
  121     const char *name, struct uio *uio);
  122 
  123 int ext2_extattr_block_set(struct inode *ip, int attrnamespace,
  124     const char *name, struct uio *uio);
  125 
  126 int ext2_extattr_valid_attrname(int attrnamespace, const char *attrname);
  127 
  128 #endif  /* !_FS_EXT2FS_EXT2_EXTARTTR_H_ */

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