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

     /*-
      * Copyright (c) 2017, Fedor Uporov
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
      *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     * $FreeBSD$
     */
    
    #ifndef _FS_EXT2FS_EXT2_EXTARTTR_H_
    #define _FS_EXT2FS_EXT2_EXTARTTR_H_
    
    /* Linux xattr name indexes */
    #define EXT4_XATTR_INDEX_USER                   1
    #define EXT4_XATTR_INDEX_POSIX_ACL_ACCESS       2
    #define EXT4_XATTR_INDEX_POSIX_ACL_DEFAULT      3
    #define EXT4_XATTR_INDEX_TRUSTED                4
    #define EXT4_XATTR_INDEX_LUSTRE                 5
    #define EXT4_XATTR_INDEX_SECURITY               6
    #define EXT4_XATTR_INDEX_SYSTEM                 7
    #define EXT4_XATTR_INDEX_RICHACL                8
    #define EXT4_XATTR_INDEX_ENCRYPTION             9
    
    /* Magic value in attribute blocks */
    #define EXTATTR_MAGIC 0xEA020000
    
    /* Max EA name length */
    #define EXT2_EXTATTR_NAMELEN_MAX                255
    
    /* EA hash constants */
    #define EXT2_EXTATTR_NAME_HASH_SHIFT            5
    #define EXT2_EXTATTR_VALUE_HASH_SHIFT           16
    #define EXT2_EXTATTR_BLOCK_HASH_SHIFT           16
    
    
    struct ext2fs_extattr_header {
            int32_t h_magic;        /* magic number for identification */
            int32_t h_refcount;     /* reference count */
            int32_t h_blocks;       /* number of disk blocks used */
            int32_t h_hash;         /* hash value of all attributes */
            uint32_t h_reserved[4]; /* zero right now */
    };
    
    struct ext2fs_extattr_dinode_header {
            int32_t h_magic;        /* magic number for identification */
    };
    
    struct ext2fs_extattr_entry {
            uint8_t e_name_len;             /* length of name */
            uint8_t e_name_index;           /* attribute name index */
            uint16_t        e_value_offs;   /* offset in disk block of value */
            uint32_t        e_value_block;  /* disk block attribute is stored on (n/i) */
            uint32_t        e_value_size;   /* size of attribute value */
            uint32_t        e_hash;         /* hash value of name and value */
            char    e_name[0];              /* attribute name */
    };
    
    #define EXT2_IFIRST(hdr) ((struct ext2fs_extattr_entry *)((hdr)+1))
    
    #define EXT2_HDR(bh) ((struct ext2fs_extattr_header *)((bh)->b_data))
    #define EXT2_ENTRY(ptr) ((struct ext2fs_extattr_entry *)(ptr))
    #define EXT2_FIRST_ENTRY(bh) EXT2_ENTRY(EXT2_HDR(bh)+1)
    #define EXT2_IS_LAST_ENTRY(entry) (*(uint32_t *)(entry) == 0)
    
    #define EXT2_EXTATTR_PAD_BITS           2
    #define EXT2_EXTATTR_PAD                (1<<EXT2_EXTATTR_PAD_BITS)
    #define EXT2_EXTATTR_ROUND              (EXT2_EXTATTR_PAD-1)
    #define EXT2_EXTATTR_LEN(name_len) \
            (((name_len) + EXT2_EXTATTR_ROUND + \
                sizeof(struct ext2fs_extattr_entry)) & ~EXT2_EXTATTR_ROUND)
    
    #define EXT2_EXTATTR_SIZE(size) \
        (((size) + EXT2_EXTATTR_ROUND) & ~EXT2_EXTATTR_ROUND)
    
    #define EXT2_EXTATTR_NEXT(entry) \
            ( (struct ext2fs_extattr_entry *)( \
                (char *)(entry) + EXT2_EXTATTR_LEN((entry)->e_name_len)) )
    
    int ext2_extattr_inode_delete(struct inode *ip, int attrnamespace,
        const char *name);
   
   int ext2_extattr_block_delete(struct inode *ip, int attrnamespace,
       const char *name);
   
   int ext2_extattr_free(struct inode *ip);
   int ext2_extattr_inode_list(struct inode *ip, int attrnamespace,
       struct uio *uio, size_t *size);
   
   int ext2_extattr_block_list(struct inode *ip, int attrnamespace,
       struct uio *uio, size_t *size);
   
   int ext2_extattr_inode_get(struct inode *ip, int attrnamespace,
       const char *name, struct uio *uio, size_t *size);
   
   int ext2_extattr_block_get(struct inode *ip, int attrnamespace,
       const char *name, struct uio *uio, size_t *size);
   
   int ext2_extattr_inode_set(struct inode *ip, int attrnamespace,
       const char *name, struct uio *uio);
   
   int ext2_extattr_block_set(struct inode *ip, int attrnamespace,
       const char *name, struct uio *uio);
   
   int ext2_extattr_valid_attrname(int attrnamespace, const char *attrname);
   
   #endif  /* !_FS_EXT2FS_EXT2_EXTARTTR_H_ */

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