| 1 | /*
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| 2 | * bmove.c --- Move blocks around to make way for a particular
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| 3 | * filesystem structure.
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| 4 | *
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| 5 | * Copyright (C) 1997 Theodore Ts'o. This file may be redistributed
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| 6 | * under the terms of the GNU Public License.
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| 7 | */
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| 8 |
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| 9 | #include <stdio.h>
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| 10 | #include <string.h>
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| 11 | #if HAVE_UNISTD_H
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| 12 | #include <unistd.h>
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| 13 | #endif
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| 14 | #if HAVE_SYS_TYPES_H
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| 15 | #include <sys/types.h>
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| 16 | #endif
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| 17 |
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| 18 | #include "ext2_fs.h"
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| 19 | #include "ext2fsP.h"
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| 20 |
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| 21 | struct process_block_struct {
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| 22 | ext2_ino_t ino;
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| 23 | struct ext2_inode * inode;
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| 24 | ext2fs_block_bitmap reserve;
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| 25 | ext2fs_block_bitmap alloc_map;
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| 26 | errcode_t error;
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| 27 | char *buf;
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| 28 | int add_dir;
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| 29 | int flags;
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| 30 | };
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| 31 |
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| 32 | static int process_block(ext2_filsys fs, blk_t *block_nr,
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| 33 | e2_blkcnt_t blockcnt, blk_t ref_block,
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| 34 | int ref_offset, void *priv_data)
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| 35 | {
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| 36 | struct process_block_struct *pb;
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| 37 | errcode_t retval;
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| 38 | int ret;
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| 39 | blk_t block, orig;
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| 40 |
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| 41 | pb = (struct process_block_struct *) priv_data;
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| 42 | block = orig = *block_nr;
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| 43 | ret = 0;
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| 44 |
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| 45 | /*
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| 46 | * Let's see if this is one which we need to relocate
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| 47 | */
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| 48 | if (ext2fs_test_block_bitmap(pb->reserve, block)) {
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| 49 | do {
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| 50 | if (++block >= fs->super->s_blocks_count)
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| 51 | block = fs->super->s_first_data_block;
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| 52 | if (block == orig) {
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| 53 | pb->error = EXT2_ET_BLOCK_ALLOC_FAIL;
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| 54 | return BLOCK_ABORT;
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| 55 | }
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| 56 | } while (ext2fs_test_block_bitmap(pb->reserve, block) ||
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| 57 | ext2fs_test_block_bitmap(pb->alloc_map, block));
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| 58 |
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| 59 | retval = io_channel_read_blk(fs->io, orig, 1, pb->buf);
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| 60 | if (retval) {
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| 61 | pb->error = retval;
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| 62 | return BLOCK_ABORT;
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| 63 | }
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| 64 | retval = io_channel_write_blk(fs->io, block, 1, pb->buf);
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| 65 | if (retval) {
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| 66 | pb->error = retval;
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| 67 | return BLOCK_ABORT;
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| 68 | }
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| 69 | *block_nr = block;
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| 70 | ext2fs_mark_block_bitmap(pb->alloc_map, block);
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| 71 | ret = BLOCK_CHANGED;
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| 72 | if (pb->flags & EXT2_BMOVE_DEBUG)
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| 73 | printf("ino=%ld, blockcnt=%lld, %d->%d\n", pb->ino,
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| 74 | blockcnt, orig, block);
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| 75 | }
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| 76 | if (pb->add_dir) {
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| 77 | retval = ext2fs_add_dir_block(fs->dblist, pb->ino,
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| 78 | block, (int) blockcnt);
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| 79 | if (retval) {
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| 80 | pb->error = retval;
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| 81 | ret |= BLOCK_ABORT;
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| 82 | }
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| 83 | }
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| 84 | return ret;
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| 85 | }
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| 86 |
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| 87 | errcode_t ext2fs_move_blocks(ext2_filsys fs,
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| 88 | ext2fs_block_bitmap reserve,
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| 89 | ext2fs_block_bitmap alloc_map,
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| 90 | int flags)
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| 91 | {
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| 92 | ext2_ino_t ino;
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| 93 | struct ext2_inode inode;
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| 94 | errcode_t retval;
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| 95 | struct process_block_struct pb;
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| 96 | ext2_inode_scan scan;
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| 97 | char *block_buf;
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| 98 |
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| 99 | retval = ext2fs_open_inode_scan(fs, 0, &scan);
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| 100 | if (retval)
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| 101 | return retval;
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| 102 |
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| 103 | pb.reserve = reserve;
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| 104 | pb.error = 0;
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| 105 | pb.alloc_map = alloc_map ? alloc_map : fs->block_map;
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| 106 | pb.flags = flags;
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| 107 |
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| 108 | retval = ext2fs_get_mem(fs->blocksize * 4, &block_buf);
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| 109 | if (retval)
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| 110 | return retval;
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| 111 | pb.buf = block_buf + fs->blocksize * 3;
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| 112 |
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| 113 | /*
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| 114 | * If GET_DBLIST is set in the flags field, then we should
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| 115 | * gather directory block information while we're doing the
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| 116 | * block move.
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| 117 | */
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| 118 | if (flags & EXT2_BMOVE_GET_DBLIST) {
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| 119 | ext2fs_free_dblist(fs->dblist);
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| 120 | fs->dblist = NULL;
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| 121 | retval = ext2fs_init_dblist(fs, 0);
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| 122 | if (retval)
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| 123 | return retval;
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| 124 | }
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| 125 |
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| 126 | retval = ext2fs_get_next_inode(scan, &ino, &inode);
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| 127 | if (retval)
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| 128 | return retval;
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| 129 |
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| 130 | while (ino) {
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| 131 | if ((inode.i_links_count == 0) ||
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| 132 | !ext2fs_inode_has_valid_blocks(&inode))
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| 133 | goto next;
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| 134 |
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| 135 | pb.ino = ino;
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| 136 | pb.inode = &inode;
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| 137 |
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| 138 | pb.add_dir = (LINUX_S_ISDIR(inode.i_mode) &&
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| 139 | flags & EXT2_BMOVE_GET_DBLIST);
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| 140 |
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| 141 | retval = ext2fs_block_iterate2(fs, ino, 0, block_buf,
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| 142 | process_block, &pb);
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| 143 | if (retval)
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| 144 | return retval;
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| 145 | if (pb.error)
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| 146 | return pb.error;
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| 147 |
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| 148 | next:
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| 149 | retval = ext2fs_get_next_inode(scan, &ino, &inode);
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| 150 | if (retval == EXT2_ET_BAD_BLOCK_IN_INODE_TABLE)
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| 151 | goto next;
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| 152 | }
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| 153 | return 0;
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| 154 | }
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| 155 |
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