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  * Copyright (c) 2017, Fedor Uporov
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  *
   26  * $FreeBSD: releng/11.2/sys/fs/ext2fs/ext2_extattr.h 322711 2017-08-20 01:08:23Z pfg $
   27  */
   28 
   29 #ifndef _FS_EXT2FS_EXT2_EXTARTTR_H_
   30 #define _FS_EXT2FS_EXT2_EXTARTTR_H_
   31 
   32 /* Linux xattr name indexes */
   33 #define EXT4_XATTR_INDEX_USER                   1
   34 #define EXT4_XATTR_INDEX_POSIX_ACL_ACCESS       2
   35 #define EXT4_XATTR_INDEX_POSIX_ACL_DEFAULT      3
   36 #define EXT4_XATTR_INDEX_TRUSTED                4
   37 #define EXT4_XATTR_INDEX_LUSTRE                 5
   38 #define EXT4_XATTR_INDEX_SECURITY               6
   39 #define EXT4_XATTR_INDEX_SYSTEM                 7
   40 #define EXT4_XATTR_INDEX_RICHACL                8
   41 #define EXT4_XATTR_INDEX_ENCRYPTION             9
   42 
   43 /* Magic value in attribute blocks */
   44 #define EXTATTR_MAGIC 0xEA020000
   45 
   46 /* Max EA name length */
   47 #define EXT2_EXTATTR_NAMELEN_MAX                255
   48 
   49 /* EA hash constants */
   50 #define EXT2_EXTATTR_NAME_HASH_SHIFT            5
   51 #define EXT2_EXTATTR_VALUE_HASH_SHIFT           16
   52 #define EXT2_EXTATTR_BLOCK_HASH_SHIFT           16
   53 
   54 
   55 struct ext2fs_extattr_header {
   56         int32_t h_magic;        /* magic number for identification */
   57         int32_t h_refcount;     /* reference count */
   58         int32_t h_blocks;       /* number of disk blocks used */
   59         int32_t h_hash;         /* hash value of all attributes */
   60         uint32_t h_reserved[4]; /* zero right now */
   61 };
   62 
   63 struct ext2fs_extattr_dinode_header {
   64         int32_t h_magic;        /* magic number for identification */
   65 };
   66 
   67 struct ext2fs_extattr_entry {
   68         uint8_t e_name_len;             /* length of name */
   69         uint8_t e_name_index;           /* attribute name index */
   70         uint16_t        e_value_offs;   /* offset in disk block of value */
   71         uint32_t        e_value_block;  /* disk block attribute is stored on (n/i) */
   72         uint32_t        e_value_size;   /* size of attribute value */
   73         uint32_t        e_hash;         /* hash value of name and value */
   74         char    e_name[0];              /* attribute name */
   75 };
   76 
   77 #define EXT2_IFIRST(hdr) ((struct ext2fs_extattr_entry *)((hdr)+1))
   78 
   79 #define EXT2_HDR(bh) ((struct ext2fs_extattr_header *)((bh)->b_data))
   80 #define EXT2_ENTRY(ptr) ((struct ext2fs_extattr_entry *)(ptr))
   81 #define EXT2_FIRST_ENTRY(bh) EXT2_ENTRY(EXT2_HDR(bh)+1)
   82 #define EXT2_IS_LAST_ENTRY(entry) (*(uint32_t *)(entry) == 0)
   83 
   84 #define EXT2_EXTATTR_PAD_BITS           2
   85 #define EXT2_EXTATTR_PAD                (1<<EXT2_EXTATTR_PAD_BITS)
   86 #define EXT2_EXTATTR_ROUND              (EXT2_EXTATTR_PAD-1)
   87 #define EXT2_EXTATTR_LEN(name_len) \
   88         (((name_len) + EXT2_EXTATTR_ROUND + \
   89             sizeof(struct ext2fs_extattr_entry)) & ~EXT2_EXTATTR_ROUND)
   90 
   91 #define EXT2_EXTATTR_SIZE(size) \
   92     (((size) + EXT2_EXTATTR_ROUND) & ~EXT2_EXTATTR_ROUND)
   93 
   94 #define EXT2_EXTATTR_NEXT(entry) \
   95         ( (struct ext2fs_extattr_entry *)( \
   96             (char *)(entry) + EXT2_EXTATTR_LEN((entry)->e_name_len)) )
   97 
   98 int ext2_extattr_inode_delete(struct inode *ip, int attrnamespace,
   99     const char *name);
  100 
  101 int ext2_extattr_block_delete(struct inode *ip, int attrnamespace,
  102     const char *name);
  103 
  104 int ext2_extattr_free(struct inode *ip);
  105 int ext2_extattr_inode_list(struct inode *ip, int attrnamespace,
  106     struct uio *uio, size_t *size);
  107 
  108 int ext2_extattr_block_list(struct inode *ip, int attrnamespace,
  109     struct uio *uio, size_t *size);
  110 
  111 int ext2_extattr_inode_get(struct inode *ip, int attrnamespace,
  112     const char *name, struct uio *uio, size_t *size);
  113 
  114 int ext2_extattr_block_get(struct inode *ip, int attrnamespace,
  115     const char *name, struct uio *uio, size_t *size);
  116 
  117 int ext2_extattr_inode_set(struct inode *ip, int attrnamespace,
  118     const char *name, struct uio *uio);
  119 
  120 int ext2_extattr_block_set(struct inode *ip, int attrnamespace,
  121     const char *name, struct uio *uio);
  122 
  123 int ext2_extattr_valid_attrname(int attrnamespace, const char *attrname);
  124 
  125 #endif  /* !_FS_EXT2FS_EXT2_EXTARTTR_H_ */

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