/* 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 = 0; 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; }