| /* vi: set sw=4 ts=4: */ |
| /* |
| * ext_attr.c --- extended attribute blocks |
| * |
| * Copyright (C) 2001 Andreas Gruenbacher, <a.gruenbacher@computer.org> |
| * |
| * Copyright (C) 2002 Theodore Ts'o. |
| * |
| * %Begin-Header% |
| * This file may be redistributed under the terms of the GNU Public |
| * License. |
| * %End-Header% |
| */ |
| |
| #include <stdio.h> |
| #include <unistd.h> |
| #include <string.h> |
| #include <time.h> |
| |
| #include "ext2_fs.h" |
| #include "ext2_ext_attr.h" |
| #include "ext2fs.h" |
| |
| 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; |
| #if BB_BIG_ENDIAN |
| if ((fs->flags & (EXT2_FLAG_SWAP_BYTES| |
| EXT2_FLAG_SWAP_BYTES_READ)) != 0) |
| ext2fs_swap_ext_attr(buf, buf, fs->blocksize, 1); |
| #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; |
| |
| if (BB_BIG_ENDIAN && ((fs->flags & EXT2_FLAG_SWAP_BYTES) || |
| (fs->flags & EXT2_FLAG_SWAP_BYTES_WRITE))) { |
| retval = ext2fs_get_mem(fs->blocksize, &buf); |
| if (retval) |
| return retval; |
| write_buf = buf; |
| ext2fs_swap_ext_attr(buf, inbuf, fs->blocksize, 1); |
| } else |
| write_buf = (char *) inbuf; |
| retval = io_channel_write_blk(fs->io, block, 1, write_buf); |
| if (buf) |
| ext2fs_free_mem(&buf); |
| if (!retval) |
| ext2fs_mark_changed(fs); |
| return retval; |
| } |
| |
| /* |
| * This function adjusts the reference count of the EA block. |
| */ |
| errcode_t ext2fs_adjust_ea_refcount(ext2_filsys fs, blk_t blk, |
| char *block_buf, int adjust, |
| __u32 *newcount) |
| { |
| errcode_t retval; |
| struct ext2_ext_attr_header *header; |
| char *buf = NULL; |
| |
| if ((blk >= fs->super->s_blocks_count) || |
| (blk < fs->super->s_first_data_block)) |
| return EXT2_ET_BAD_EA_BLOCK_NUM; |
| |
| if (!block_buf) { |
| retval = ext2fs_get_mem(fs->blocksize, &buf); |
| if (retval) |
| return retval; |
| block_buf = buf; |
| } |
| |
| retval = ext2fs_read_ext_attr(fs, blk, block_buf); |
| if (retval) |
| goto errout; |
| |
| header = (struct ext2_ext_attr_header *) block_buf; |
| header->h_refcount += adjust; |
| if (newcount) |
| *newcount = header->h_refcount; |
| |
| retval = ext2fs_write_ext_attr(fs, blk, block_buf); |
| if (retval) |
| goto errout; |
| |
| errout: |
| if (buf) |
| ext2fs_free_mem(&buf); |
| return retval; |
| } |
