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