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