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: releng/12.0/sys/fs/ext2fs/ext2_extattr.h 327977 2018-01-14 20:46:39Z fsu $
   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 
   57 struct ext2fs_extattr_header {
   58         int32_t h_magic;        /* magic number for identification */
   59         int32_t h_refcount;     /* reference count */
   60         int32_t h_blocks;       /* number of disk blocks used */
   61         int32_t h_hash;         /* hash value of all attributes */
   62         int32_t h_checksum;     /* crc32c(uuid+id+xattrblock) */
   63                                 /* id = inum if refcount=1, blknum otherwise */
   64         uint32_t h_reserved[3]; /* zero right now */
   65 };
   66 
   67 struct ext2fs_extattr_dinode_header {
   68         int32_t h_magic;        /* magic number for identification */
   69 };
   70 
   71 struct ext2fs_extattr_entry {
   72         uint8_t e_name_len;             /* length of name */
   73         uint8_t e_name_index;           /* attribute name index */
   74         uint16_t        e_value_offs;   /* offset in disk block of value */
   75         uint32_t        e_value_block;  /* disk block attribute is stored on (n/i) */
   76         uint32_t        e_value_size;   /* size of attribute value */
   77         uint32_t        e_hash;         /* hash value of name and value */
   78         char    e_name[0];              /* attribute name */
   79 };
   80 
   81 #define EXT2_IFIRST(hdr) ((struct ext2fs_extattr_entry *)((hdr)+1))
   82 
   83 #define EXT2_HDR(bh) ((struct ext2fs_extattr_header *)((bh)->b_data))
   84 #define EXT2_ENTRY(ptr) ((struct ext2fs_extattr_entry *)(ptr))
   85 #define EXT2_FIRST_ENTRY(bh) EXT2_ENTRY(EXT2_HDR(bh)+1)
   86 #define EXT2_IS_LAST_ENTRY(entry) (*(uint32_t *)(entry) == 0)
   87 
   88 #define EXT2_EXTATTR_PAD_BITS           2
   89 #define EXT2_EXTATTR_PAD                (1<<EXT2_EXTATTR_PAD_BITS)
   90 #define EXT2_EXTATTR_ROUND              (EXT2_EXTATTR_PAD-1)
   91 #define EXT2_EXTATTR_LEN(name_len) \
   92         (((name_len) + EXT2_EXTATTR_ROUND + \
   93             sizeof(struct ext2fs_extattr_entry)) & ~EXT2_EXTATTR_ROUND)
   94 
   95 #define EXT2_EXTATTR_SIZE(size) \
   96     (((size) + EXT2_EXTATTR_ROUND) & ~EXT2_EXTATTR_ROUND)
   97 
   98 #define EXT2_EXTATTR_NEXT(entry) \
   99         ( (struct ext2fs_extattr_entry *)( \
  100             (char *)(entry) + EXT2_EXTATTR_LEN((entry)->e_name_len)) )
  101 
  102 int ext2_extattr_inode_delete(struct inode *ip, int attrnamespace,
  103     const char *name);
  104 
  105 int ext2_extattr_block_delete(struct inode *ip, int attrnamespace,
  106     const char *name);
  107 
  108 int ext2_extattr_free(struct inode *ip);
  109 int ext2_extattr_inode_list(struct inode *ip, int attrnamespace,
  110     struct uio *uio, size_t *size);
  111 
  112 int ext2_extattr_block_list(struct inode *ip, int attrnamespace,
  113     struct uio *uio, size_t *size);
  114 
  115 int ext2_extattr_inode_get(struct inode *ip, int attrnamespace,
  116     const char *name, struct uio *uio, size_t *size);
  117 
  118 int ext2_extattr_block_get(struct inode *ip, int attrnamespace,
  119     const char *name, struct uio *uio, size_t *size);
  120 
  121 int ext2_extattr_inode_set(struct inode *ip, int attrnamespace,
  122     const char *name, struct uio *uio);
  123 
  124 int ext2_extattr_block_set(struct inode *ip, int attrnamespace,
  125     const char *name, struct uio *uio);
  126 
  127 int ext2_extattr_valid_attrname(int attrnamespace, const char *attrname);
  128 
  129 #endif  /* !_FS_EXT2FS_EXT2_EXTARTTR_H_ */

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