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Viewing changes to lib/ext2fs/ext_attr.c

  • Committer: Bazaar Package Importer
  • Author(s): Yann Dirson
  • Date: 2002-03-21 23:58:48 UTC
  • Revision ID: james.westby@ubuntu.com-20020321235848-cmmy98hy0nihp922
Tags: upstream-1.27
Import upstream version 1.27

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lib/ext2fs/ext_attr.c
 
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/*
 
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 * ext_attr.c --- extended attribute blocks
 
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 * 
 
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 * Copyright (C) Andreas Gruenbacher, <a.gruenbacher@computer.org>
 
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 *
 
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 * %Begin-Header%
 
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 * This file may be redistributed under the terms of the GNU Public
 
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 * License.
 
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 * %End-Header%
 
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 */
 
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#include <stdio.h>
 
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#if HAVE_UNISTD_H
 
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#include <unistd.h>
 
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#endif
 
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#include <string.h>
 
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#include <time.h>
 
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#include "ext2_fs.h"
 
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#include "ext2_ext_attr.h"
 
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#include "ext2fs.h"
 
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#ifdef EXT2FS_ENABLE_SWAPFS
 
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void ext2fs_swap_ext_attr(ext2_filsys fs, char *to, char *from)
 
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{
 
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        struct ext2_ext_attr_header *from_header =
 
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                (struct ext2_ext_attr_header *)from;
 
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        struct ext2_ext_attr_header *to_header =
 
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                (struct ext2_ext_attr_header *)to;
 
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        struct ext2_ext_attr_entry *from_entry, *to_entry;
 
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        char *from_end = (char *)from_header + fs->blocksize;
 
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        int n;
 
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        if (to_header != from_header)
 
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                memcpy(to_header, from_header, fs->blocksize);
 
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        to_header->h_magic    = ext2fs_swab32(from_header->h_magic);
 
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        to_header->h_blocks   = ext2fs_swab32(from_header->h_blocks);
 
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        to_header->h_refcount = ext2fs_swab32(from_header->h_refcount);
 
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        for (n=0; n<4; n++)
 
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                to_header->h_reserved[n] =
 
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                        ext2fs_swab32(from_header->h_reserved[n]);
 
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        from_entry = (struct ext2_ext_attr_entry *)(from_header+1);
 
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        to_entry   = (struct ext2_ext_attr_entry *)(to_header+1);
 
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        while ((char *)from_entry < from_end && *(__u32 *)from_entry) {
 
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                to_entry->e_value_offs  =       
 
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                        ext2fs_swab16(from_entry->e_value_offs);
 
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                to_entry->e_value_block =       
 
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                        ext2fs_swab32(from_entry->e_value_block);
 
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                to_entry->e_value_size  =       
 
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                        ext2fs_swab32(from_entry->e_value_size);
 
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                from_entry = EXT2_EXT_ATTR_NEXT(from_entry);
 
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                to_entry   = EXT2_EXT_ATTR_NEXT(to_entry);
 
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        }
 
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}
 
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#endif
 
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errcode_t ext2fs_read_ext_attr(ext2_filsys fs, blk_t block, void *buf)
 
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{
 
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        errcode_t       retval;
 
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        retval = io_channel_read_blk(fs->io, block, 1, buf);
 
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        if (retval)
 
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                return retval;
 
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#ifdef EXT2FS_ENABLE_SWAPFS
 
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        if ((fs->flags & (EXT2_FLAG_SWAP_BYTES|
 
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                          EXT2_FLAG_SWAP_BYTES_READ)) != 0)
 
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                ext2fs_swap_ext_attr(fs, buf, buf);
 
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#endif
 
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        return 0;
 
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}
 
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errcode_t ext2fs_write_ext_attr(ext2_filsys fs, blk_t block, void *inbuf)
 
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{
 
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        errcode_t       retval;
 
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        char            *write_buf;
 
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        char            *buf = NULL;
 
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#ifdef EXT2FS_ENABLE_SWAPFS
 
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        if ((fs->flags & EXT2_FLAG_SWAP_BYTES) ||
 
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            (fs->flags & EXT2_FLAG_SWAP_BYTES_WRITE)) {
 
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                retval = ext2fs_get_mem(fs->blocksize, (void **) &buf);
 
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                if (retval)
 
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                        return retval;
 
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                write_buf = buf;
 
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                ext2fs_swap_ext_attr(fs, buf, inbuf);
 
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        } else
 
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#endif
 
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                write_buf = (char *) inbuf;
 
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        retval = io_channel_write_blk(fs->io, block, 1, write_buf);
 
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        if (buf)
 
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                ext2fs_free_mem((void **) &buf);
 
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        if (!retval)
 
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                ext2fs_mark_changed(fs);
 
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        return retval;
 
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}