1 /* 2 * ext_attr.c --- extended attribute blocks 3 * 4 * Copyright (C) 2001 Andreas Gruenbacher, <a.gruenbacher (at) computer.org> 5 * 6 * Copyright (C) 2002 Theodore Ts'o. 7 * 8 * %Begin-Header% 9 * This file may be redistributed under the terms of the GNU Public 10 * License. 11 * %End-Header% 12 */ 13 14 #include <stdio.h> 15 #if HAVE_UNISTD_H 16 #include <unistd.h> 17 #endif 18 #include <string.h> 19 #include <time.h> 20 21 #include "ext2_fs.h" 22 #include "ext2_ext_attr.h" 23 24 #include "ext2fs.h" 25 26 errcode_t ext2fs_read_ext_attr(ext2_filsys fs, blk_t block, void *buf) 27 { 28 errcode_t retval; 29 30 retval = io_channel_read_blk(fs->io, block, 1, buf); 31 if (retval) 32 return retval; 33 #ifdef EXT2FS_ENABLE_SWAPFS 34 if ((fs->flags & (EXT2_FLAG_SWAP_BYTES| 35 EXT2_FLAG_SWAP_BYTES_READ)) != 0) 36 ext2fs_swap_ext_attr(buf, buf, fs->blocksize, 1); 37 #endif 38 return 0; 39 } 40 41 errcode_t ext2fs_write_ext_attr(ext2_filsys fs, blk_t block, void *inbuf) 42 { 43 errcode_t retval; 44 char *write_buf; 45 char *buf = NULL; 46 47 #ifdef EXT2FS_ENABLE_SWAPFS 48 if ((fs->flags & EXT2_FLAG_SWAP_BYTES) || 49 (fs->flags & EXT2_FLAG_SWAP_BYTES_WRITE)) { 50 retval = ext2fs_get_mem(fs->blocksize, &buf); 51 if (retval) 52 return retval; 53 write_buf = buf; 54 ext2fs_swap_ext_attr(buf, inbuf, fs->blocksize, 1); 55 } else 56 #endif 57 write_buf = (char *) inbuf; 58 retval = io_channel_write_blk(fs->io, block, 1, write_buf); 59 if (buf) 60 ext2fs_free_mem(&buf); 61 if (!retval) 62 ext2fs_mark_changed(fs); 63 return retval; 64 } 65 66 /* 67 * This function adjusts the reference count of the EA block. 68 */ 69 errcode_t ext2fs_adjust_ea_refcount(ext2_filsys fs, blk_t blk, 70 char *block_buf, int adjust, 71 __u32 *newcount) 72 { 73 errcode_t retval; 74 struct ext2_ext_attr_header *header; 75 char *buf = 0; 76 77 if ((blk >= fs->super->s_blocks_count) || 78 (blk < fs->super->s_first_data_block)) 79 return EXT2_ET_BAD_EA_BLOCK_NUM; 80 81 if (!block_buf) { 82 retval = ext2fs_get_mem(fs->blocksize, &buf); 83 if (retval) 84 return retval; 85 block_buf = buf; 86 } 87 88 retval = ext2fs_read_ext_attr(fs, blk, block_buf); 89 if (retval) 90 goto errout; 91 92 header = (struct ext2_ext_attr_header *) block_buf; 93 header->h_refcount += adjust; 94 if (newcount) 95 *newcount = header->h_refcount; 96 97 retval = ext2fs_write_ext_attr(fs, blk, block_buf); 98 if (retval) 99 goto errout; 100 101 errout: 102 if (buf) 103 ext2fs_free_mem(&buf); 104 return retval; 105 } 106
