1 /* 2 * bmove.c --- Move blocks around to make way for a particular 3 * filesystem structure. 4 * 5 * Copyright (C) 1997 Theodore Ts'o. This file may be redistributed 6 * under the terms of the GNU Public License. 7 */ 8 9 #include <stdio.h> 10 #include <string.h> 11 #if HAVE_UNISTD_H 12 #include <unistd.h> 13 #endif 14 #if HAVE_SYS_TYPES_H 15 #include <sys/types.h> 16 #endif 17 #if HAVE_SYS_TIME_H 18 #include <sys/time.h> 19 #endif 20 21 #include "ext2_fs.h" 22 #include "ext2fsP.h" 23 24 struct process_block_struct { 25 ext2_ino_t ino; 26 struct ext2_inode * inode; 27 ext2fs_block_bitmap reserve; 28 ext2fs_block_bitmap alloc_map; 29 errcode_t error; 30 char *buf; 31 int add_dir; 32 int flags; 33 }; 34 35 static int process_block(ext2_filsys fs, blk_t *block_nr, 36 e2_blkcnt_t blockcnt, blk_t ref_block, 37 int ref_offset, void *priv_data) 38 { 39 struct process_block_struct *pb; 40 errcode_t retval; 41 int ret; 42 blk_t block, orig; 43 44 pb = (struct process_block_struct *) priv_data; 45 block = orig = *block_nr; 46 ret = 0; 47 48 /* 49 * Let's see if this is one which we need to relocate 50 */ 51 if (ext2fs_test_block_bitmap(pb->reserve, block)) { 52 do { 53 if (++block >= fs->super->s_blocks_count) 54 block = fs->super->s_first_data_block; 55 if (block == orig) { 56 pb->error = EXT2_ET_BLOCK_ALLOC_FAIL; 57 return BLOCK_ABORT; 58 } 59 } while (ext2fs_test_block_bitmap(pb->reserve, block) || 60 ext2fs_test_block_bitmap(pb->alloc_map, block)); 61 62 retval = io_channel_read_blk(fs->io, orig, 1, pb->buf); 63 if (retval) { 64 pb->error = retval; 65 return BLOCK_ABORT; 66 } 67 retval = io_channel_write_blk(fs->io, block, 1, pb->buf); 68 if (retval) { 69 pb->error = retval; 70 return BLOCK_ABORT; 71 } 72 *block_nr = block; 73 ext2fs_mark_block_bitmap(pb->alloc_map, block); 74 ret = BLOCK_CHANGED; 75 if (pb->flags & EXT2_BMOVE_DEBUG) 76 printf("ino=%ld, blockcnt=%lld, %u->%u\n", pb->ino, 77 blockcnt, orig, block); 78 } 79 if (pb->add_dir) { 80 retval = ext2fs_add_dir_block(fs->dblist, pb->ino, 81 block, (int) blockcnt); 82 if (retval) { 83 pb->error = retval; 84 ret |= BLOCK_ABORT; 85 } 86 } 87 return ret; 88 } 89 90 errcode_t ext2fs_move_blocks(ext2_filsys fs, 91 ext2fs_block_bitmap reserve, 92 ext2fs_block_bitmap alloc_map, 93 int flags) 94 { 95 ext2_ino_t ino; 96 struct ext2_inode inode; 97 errcode_t retval; 98 struct process_block_struct pb; 99 ext2_inode_scan scan; 100 char *block_buf; 101 102 retval = ext2fs_open_inode_scan(fs, 0, &scan); 103 if (retval) 104 return retval; 105 106 pb.reserve = reserve; 107 pb.error = 0; 108 pb.alloc_map = alloc_map ? alloc_map : fs->block_map; 109 pb.flags = flags; 110 111 retval = ext2fs_get_array(4, fs->blocksize, &block_buf); 112 if (retval) 113 return retval; 114 pb.buf = block_buf + fs->blocksize * 3; 115 116 /* 117 * If GET_DBLIST is set in the flags field, then we should 118 * gather directory block information while we're doing the 119 * block move. 120 */ 121 if (flags & EXT2_BMOVE_GET_DBLIST) { 122 if (fs->dblist) { 123 ext2fs_free_dblist(fs->dblist); 124 fs->dblist = NULL; 125 } 126 retval = ext2fs_init_dblist(fs, 0); 127 if (retval) 128 return retval; 129 } 130 131 retval = ext2fs_get_next_inode(scan, &ino, &inode); 132 if (retval) 133 return retval; 134 135 while (ino) { 136 if ((inode.i_links_count == 0) || 137 !ext2fs_inode_has_valid_blocks(&inode)) 138 goto next; 139 140 pb.ino = ino; 141 pb.inode = &inode; 142 143 pb.add_dir = (LINUX_S_ISDIR(inode.i_mode) && 144 flags & EXT2_BMOVE_GET_DBLIST); 145 146 retval = ext2fs_block_iterate2(fs, ino, 0, block_buf, 147 process_block, &pb); 148 if (retval) 149 return retval; 150 if (pb.error) 151 return pb.error; 152 153 next: 154 retval = ext2fs_get_next_inode(scan, &ino, &inode); 155 if (retval == EXT2_ET_BAD_BLOCK_IN_INODE_TABLE) 156 goto next; 157 } 158 return 0; 159 } 160 161
