[1765] | 1 | /* vi: set sw=4 ts=4: */
|
---|
| 2 | /*
|
---|
| 3 | * bmove.c --- Move blocks around to make way for a particular
|
---|
| 4 | * filesystem structure.
|
---|
| 5 | *
|
---|
| 6 | * Copyright (C) 1997 Theodore Ts'o. This file may be redistributed
|
---|
| 7 | * under the terms of the GNU Public License.
|
---|
| 8 | */
|
---|
| 9 |
|
---|
| 10 | #include <stdio.h>
|
---|
| 11 | #include <string.h>
|
---|
| 12 | #if HAVE_UNISTD_H
|
---|
| 13 | #include <unistd.h>
|
---|
| 14 | #endif
|
---|
| 15 | #if HAVE_SYS_TYPES_H
|
---|
| 16 | #include <sys/types.h>
|
---|
| 17 | #endif
|
---|
| 18 |
|
---|
| 19 | #include "ext2_fs.h"
|
---|
| 20 | #include "ext2fsP.h"
|
---|
| 21 |
|
---|
| 22 | struct process_block_struct {
|
---|
| 23 | ext2_ino_t ino;
|
---|
| 24 | struct ext2_inode * inode;
|
---|
| 25 | ext2fs_block_bitmap reserve;
|
---|
| 26 | ext2fs_block_bitmap alloc_map;
|
---|
| 27 | errcode_t error;
|
---|
| 28 | char *buf;
|
---|
| 29 | int add_dir;
|
---|
| 30 | int flags;
|
---|
| 31 | };
|
---|
| 32 |
|
---|
| 33 | static int process_block(ext2_filsys fs, blk_t *block_nr,
|
---|
| 34 | e2_blkcnt_t blockcnt, blk_t ref_block,
|
---|
| 35 | int ref_offset, void *priv_data)
|
---|
| 36 | {
|
---|
| 37 | struct process_block_struct *pb;
|
---|
| 38 | errcode_t retval;
|
---|
| 39 | int ret;
|
---|
| 40 | blk_t block, orig;
|
---|
| 41 |
|
---|
| 42 | pb = (struct process_block_struct *) priv_data;
|
---|
| 43 | block = orig = *block_nr;
|
---|
| 44 | ret = 0;
|
---|
| 45 |
|
---|
| 46 | /*
|
---|
| 47 | * Let's see if this is one which we need to relocate
|
---|
| 48 | */
|
---|
| 49 | if (ext2fs_test_block_bitmap(pb->reserve, block)) {
|
---|
| 50 | do {
|
---|
| 51 | if (++block >= fs->super->s_blocks_count)
|
---|
| 52 | block = fs->super->s_first_data_block;
|
---|
| 53 | if (block == orig) {
|
---|
| 54 | pb->error = EXT2_ET_BLOCK_ALLOC_FAIL;
|
---|
| 55 | return BLOCK_ABORT;
|
---|
| 56 | }
|
---|
| 57 | } while (ext2fs_test_block_bitmap(pb->reserve, block) ||
|
---|
| 58 | ext2fs_test_block_bitmap(pb->alloc_map, block));
|
---|
| 59 |
|
---|
| 60 | retval = io_channel_read_blk(fs->io, orig, 1, pb->buf);
|
---|
| 61 | if (retval) {
|
---|
| 62 | pb->error = retval;
|
---|
| 63 | return BLOCK_ABORT;
|
---|
| 64 | }
|
---|
| 65 | retval = io_channel_write_blk(fs->io, block, 1, pb->buf);
|
---|
| 66 | if (retval) {
|
---|
| 67 | pb->error = retval;
|
---|
| 68 | return BLOCK_ABORT;
|
---|
| 69 | }
|
---|
| 70 | *block_nr = block;
|
---|
| 71 | ext2fs_mark_block_bitmap(pb->alloc_map, block);
|
---|
| 72 | ret = BLOCK_CHANGED;
|
---|
| 73 | if (pb->flags & EXT2_BMOVE_DEBUG)
|
---|
| 74 | printf("ino=%ld, blockcnt=%lld, %d->%d\n", pb->ino,
|
---|
| 75 | blockcnt, orig, block);
|
---|
| 76 | }
|
---|
| 77 | if (pb->add_dir) {
|
---|
| 78 | retval = ext2fs_add_dir_block(fs->dblist, pb->ino,
|
---|
| 79 | block, (int) blockcnt);
|
---|
| 80 | if (retval) {
|
---|
| 81 | pb->error = retval;
|
---|
| 82 | ret |= BLOCK_ABORT;
|
---|
| 83 | }
|
---|
| 84 | }
|
---|
| 85 | return ret;
|
---|
| 86 | }
|
---|
| 87 |
|
---|
| 88 | errcode_t ext2fs_move_blocks(ext2_filsys fs,
|
---|
| 89 | ext2fs_block_bitmap reserve,
|
---|
| 90 | ext2fs_block_bitmap alloc_map,
|
---|
| 91 | int flags)
|
---|
| 92 | {
|
---|
| 93 | ext2_ino_t ino;
|
---|
| 94 | struct ext2_inode inode;
|
---|
| 95 | errcode_t retval;
|
---|
| 96 | struct process_block_struct pb;
|
---|
| 97 | ext2_inode_scan scan;
|
---|
| 98 | char *block_buf;
|
---|
| 99 |
|
---|
| 100 | retval = ext2fs_open_inode_scan(fs, 0, &scan);
|
---|
| 101 | if (retval)
|
---|
| 102 | return retval;
|
---|
| 103 |
|
---|
| 104 | pb.reserve = reserve;
|
---|
| 105 | pb.error = 0;
|
---|
| 106 | pb.alloc_map = alloc_map ? alloc_map : fs->block_map;
|
---|
| 107 | pb.flags = flags;
|
---|
| 108 |
|
---|
| 109 | retval = ext2fs_get_mem(fs->blocksize * 4, &block_buf);
|
---|
| 110 | if (retval)
|
---|
| 111 | return retval;
|
---|
| 112 | pb.buf = block_buf + fs->blocksize * 3;
|
---|
| 113 |
|
---|
| 114 | /*
|
---|
| 115 | * If GET_DBLIST is set in the flags field, then we should
|
---|
| 116 | * gather directory block information while we're doing the
|
---|
| 117 | * block move.
|
---|
| 118 | */
|
---|
| 119 | if (flags & EXT2_BMOVE_GET_DBLIST) {
|
---|
| 120 | ext2fs_free_dblist(fs->dblist);
|
---|
| 121 | fs->dblist = NULL;
|
---|
| 122 | retval = ext2fs_init_dblist(fs, 0);
|
---|
| 123 | if (retval)
|
---|
| 124 | return retval;
|
---|
| 125 | }
|
---|
| 126 |
|
---|
| 127 | retval = ext2fs_get_next_inode(scan, &ino, &inode);
|
---|
| 128 | if (retval)
|
---|
| 129 | return retval;
|
---|
| 130 |
|
---|
| 131 | while (ino) {
|
---|
| 132 | if ((inode.i_links_count == 0) ||
|
---|
| 133 | !ext2fs_inode_has_valid_blocks(&inode))
|
---|
| 134 | goto next;
|
---|
| 135 |
|
---|
| 136 | pb.ino = ino;
|
---|
| 137 | pb.inode = &inode;
|
---|
| 138 |
|
---|
| 139 | pb.add_dir = (LINUX_S_ISDIR(inode.i_mode) &&
|
---|
| 140 | flags & EXT2_BMOVE_GET_DBLIST);
|
---|
| 141 |
|
---|
| 142 | retval = ext2fs_block_iterate2(fs, ino, 0, block_buf,
|
---|
| 143 | process_block, &pb);
|
---|
| 144 | if (retval)
|
---|
| 145 | return retval;
|
---|
| 146 | if (pb.error)
|
---|
| 147 | return pb.error;
|
---|
| 148 |
|
---|
| 149 | next:
|
---|
| 150 | retval = ext2fs_get_next_inode(scan, &ino, &inode);
|
---|
| 151 | if (retval == EXT2_ET_BAD_BLOCK_IN_INODE_TABLE)
|
---|
| 152 | goto next;
|
---|
| 153 | }
|
---|
| 154 | return 0;
|
---|
| 155 | }
|
---|
| 156 |
|
---|