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
process_block(ext2_filsys fs,blk_t * block_nr,e2_blkcnt_t blockcnt,blk_t ref_block,int ref_offset,void * priv_data)39 static int process_block(ext2_filsys fs, blk_t *block_nr,
40 e2_blkcnt_t blockcnt, blk_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 blk_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_bitmap(pb->reserve, block)) {
56 do {
57 if (++block >= fs->super->s_blocks_count)
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_bitmap(pb->reserve, block) ||
64 ext2fs_test_block_bitmap(pb->alloc_map, block));
65
66 retval = io_channel_read_blk(fs->io, orig, 1, pb->buf);
67 if (retval) {
68 pb->error = retval;
69 return BLOCK_ABORT;
70 }
71 retval = io_channel_write_blk(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_bitmap(pb->alloc_map, block);
78 ret = BLOCK_CHANGED;
79 if (pb->flags & EXT2_BMOVE_DEBUG)
80 printf("ino=%ld, blockcnt=%lld, %u->%u\n", pb->ino,
81 blockcnt, orig, block);
82 }
83 if (pb->add_dir) {
84 retval = ext2fs_add_dir_block(fs->dblist, pb->ino,
85 block, (int) blockcnt);
86 if (retval) {
87 pb->error = retval;
88 ret |= BLOCK_ABORT;
89 }
90 }
91 return ret;
92 }
93
ext2fs_move_blocks(ext2_filsys fs,ext2fs_block_bitmap reserve,ext2fs_block_bitmap alloc_map,int flags)94 errcode_t ext2fs_move_blocks(ext2_filsys fs,
95 ext2fs_block_bitmap reserve,
96 ext2fs_block_bitmap alloc_map,
97 int flags)
98 {
99 ext2_ino_t ino;
100 struct ext2_inode inode;
101 errcode_t retval;
102 struct process_block_struct pb;
103 ext2_inode_scan scan;
104 char *block_buf;
105
106 retval = ext2fs_open_inode_scan(fs, 0, &scan);
107 if (retval)
108 return retval;
109
110 pb.reserve = reserve;
111 pb.error = 0;
112 pb.alloc_map = alloc_map ? alloc_map : fs->block_map;
113 pb.flags = flags;
114
115 retval = ext2fs_get_array(4, fs->blocksize, &block_buf);
116 if (retval)
117 return retval;
118 pb.buf = block_buf + fs->blocksize * 3;
119
120 /*
121 * If GET_DBLIST is set in the flags field, then we should
122 * gather directory block information while we're doing the
123 * block move.
124 */
125 if (flags & EXT2_BMOVE_GET_DBLIST) {
126 if (fs->dblist) {
127 ext2fs_free_dblist(fs->dblist);
128 fs->dblist = NULL;
129 }
130 retval = ext2fs_init_dblist(fs, 0);
131 if (retval)
132 return retval;
133 }
134
135 retval = ext2fs_get_next_inode(scan, &ino, &inode);
136 if (retval)
137 return retval;
138
139 while (ino) {
140 if ((inode.i_links_count == 0) ||
141 !ext2fs_inode_has_valid_blocks(&inode))
142 goto next;
143
144 pb.ino = ino;
145 pb.inode = &inode;
146
147 pb.add_dir = (LINUX_S_ISDIR(inode.i_mode) &&
148 flags & EXT2_BMOVE_GET_DBLIST);
149
150 retval = ext2fs_block_iterate2(fs, ino, 0, block_buf,
151 process_block, &pb);
152 if (retval)
153 return retval;
154 if (pb.error)
155 return pb.error;
156
157 next:
158 retval = ext2fs_get_next_inode(scan, &ino, &inode);
159 if (retval == EXT2_ET_BAD_BLOCK_IN_INODE_TABLE)
160 goto next;
161 }
162 return 0;
163 }
164
165