source: MondoRescue/branches/2.2.5/mindi-busybox/e2fsprogs/old_e2fsprogs/ext2fs/bmove.c@ 1765

Last change on this file since 1765 was 1765, checked in by Bruno Cornec, 16 years ago

Update to busybox 1.7.2
  • Property svn:eol-style set to native
File size: 3.5 KB
Line 
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
22struct 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
33static 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
88errcode_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
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