1 /* 2 * bmove.c --- Move blocks around to make way for a particular 3 * filesystem structure. 4 * 5 * Copyright (C) 1997 Theodore Ts'o. 6 * 7 * %Begin-Header% 8 * This file may be redistributed under the terms of the GNU Library 9 * General Public License, version 2. 10 * %End-Header% 11 */ 12 13 #include "config.h" 14 #include <stdio.h> 15 #include <string.h> 16 #if HAVE_UNISTD_H 17 #include <unistd.h> 18 #endif 19 #if HAVE_SYS_TYPES_H 20 #include <sys/types.h> 21 #endif 22 #if HAVE_SYS_TIME_H 23 #include <sys/time.h> 24 #endif 25 26 #include "ext2_fs.h" 27 #include "ext2fsP.h" 28 29 struct process_block_struct { 30 ext2_ino_t ino; 31 struct ext2_inode * inode; 32 ext2fs_block_bitmap reserve; 33 ext2fs_block_bitmap alloc_map; 34 errcode_t error; 35 char *buf; 36 int add_dir; 37 int flags; 38 }; 39 40 static int process_block(ext2_filsys fs, blk64_t *block_nr, 41 e2_blkcnt_t blockcnt, blk64_t ref_block, 42 int ref_offset, void *priv_data) 43 { 44 struct process_block_struct *pb; 45 errcode_t retval; 46 int ret; 47 blk64_t block, orig; 48 49 pb = (struct process_block_struct *) priv_data; 50 block = orig = *block_nr; 51 ret = 0; 52 53 /* 54 * Let's see if this is one which we need to relocate 55 */ 56 if (ext2fs_test_block_bitmap2(pb->reserve, block)) { 57 do { 58 if (++block >= ext2fs_blocks_count(fs->super)) 59 block = fs->super->s_first_data_block; 60 if (block == orig) { 61 pb->error = EXT2_ET_BLOCK_ALLOC_FAIL; 62 return BLOCK_ABORT; 63 } 64 } while (ext2fs_test_block_bitmap2(pb->reserve, block) || 65 ext2fs_test_block_bitmap2(pb->alloc_map, block)); 66 67 retval = io_channel_read_blk64(fs->io, orig, 1, pb->buf); 68 if (retval) { 69 pb->error = retval; 70 return BLOCK_ABORT; 71 } 72 retval = io_channel_write_blk64(fs->io, block, 1, pb->buf); 73 if (retval) { 74 pb->error = retval; 75 return BLOCK_ABORT; 76 } 77 *block_nr = block; 78 ext2fs_mark_block_bitmap2(pb->alloc_map, block); 79 ret = BLOCK_CHANGED; 80 if (pb->flags & EXT2_BMOVE_DEBUG) 81 printf("ino=%u, blockcnt=%lld, %llu->%llu\n", 82 (unsigned) pb->ino, blockcnt, 83 (unsigned long long) orig, 84 (unsigned long long) block); 85 } 86 if (pb->add_dir) { 87 retval = ext2fs_add_dir_block2(fs->dblist, pb->ino, 88 block, blockcnt); 89 if (retval) { 90 pb->error = retval; 91 ret |= BLOCK_ABORT; 92 } 93 } 94 return ret; 95 } 96 97 errcode_t ext2fs_move_blocks(ext2_filsys fs, 98 ext2fs_block_bitmap reserve, 99 ext2fs_block_bitmap alloc_map, 100 int flags) 101 { 102 ext2_ino_t ino; 103 struct ext2_inode inode; 104 errcode_t retval; 105 struct process_block_struct pb; 106 ext2_inode_scan scan; 107 char *block_buf; 108 109 retval = ext2fs_open_inode_scan(fs, 0, &scan); 110 if (retval) 111 return retval; 112 113 pb.reserve = reserve; 114 pb.error = 0; 115 pb.alloc_map = alloc_map ? alloc_map : fs->block_map; 116 pb.flags = flags; 117 118 retval = ext2fs_get_array(4, fs->blocksize, &block_buf); 119 if (retval) 120 return retval; 121 pb.buf = block_buf + fs->blocksize * 3; 122 123 /* 124 * If GET_DBLIST is set in the flags field, then we should 125 * gather directory block information while we're doing the 126 * block move. 127 */ 128 if (flags & EXT2_BMOVE_GET_DBLIST) { 129 if (fs->dblist) { 130 ext2fs_free_dblist(fs->dblist); 131 fs->dblist = NULL; 132 } 133 retval = ext2fs_init_dblist(fs, 0); 134 if (retval) 135 return retval; 136 } 137 138 retval = ext2fs_get_next_inode(scan, &ino, &inode); 139 if (retval) 140 return retval; 141 142 while (ino) { 143 if ((inode.i_links_count == 0) || 144 !ext2fs_inode_has_valid_blocks2(fs, &inode)) 145 goto next; 146 147 pb.ino = ino; 148 pb.inode = &inode; 149 150 pb.add_dir = (LINUX_S_ISDIR(inode.i_mode) && 151 flags & EXT2_BMOVE_GET_DBLIST); 152 153 retval = ext2fs_block_iterate3(fs, ino, 0, block_buf, 154 process_block, &pb); 155 if (retval) 156 return retval; 157 if (pb.error) 158 return pb.error; 159 160 next: 161 retval = ext2fs_get_next_inode(scan, &ino, &inode); 162 if (retval == EXT2_ET_BAD_BLOCK_IN_INODE_TABLE) 163 goto next; 164 } 165 return 0; 166 } 167 168
