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1da177e4 LT |
1 | /* |
2 | * linux/fs/hfsplus/wrapper.c | |
3 | * | |
4 | * Copyright (C) 2001 | |
5 | * Brad Boyer (flar@allandria.com) | |
6 | * (C) 2003 Ardis Technologies <roman@ardistech.com> | |
7 | * | |
8 | * Handling of HFS wrappers around HFS+ volumes | |
9 | */ | |
10 | ||
11 | #include <linux/fs.h> | |
12 | #include <linux/blkdev.h> | |
13 | #include <linux/cdrom.h> | |
14 | #include <linux/genhd.h> | |
1da177e4 LT |
15 | #include <asm/unaligned.h> |
16 | ||
17 | #include "hfsplus_fs.h" | |
18 | #include "hfsplus_raw.h" | |
19 | ||
20 | struct hfsplus_wd { | |
21 | u32 ablk_size; | |
22 | u16 ablk_start; | |
23 | u16 embed_start; | |
24 | u16 embed_count; | |
25 | }; | |
26 | ||
52399b17 CH |
27 | static void hfsplus_end_io_sync(struct bio *bio, int err) |
28 | { | |
29 | if (err) | |
30 | clear_bit(BIO_UPTODATE, &bio->bi_flags); | |
31 | complete(bio->bi_private); | |
32 | } | |
33 | ||
34 | int hfsplus_submit_bio(struct block_device *bdev, sector_t sector, | |
35 | void *data, int rw) | |
36 | { | |
37 | DECLARE_COMPLETION_ONSTACK(wait); | |
38 | struct bio *bio; | |
50176dde | 39 | int ret = 0; |
52399b17 CH |
40 | |
41 | bio = bio_alloc(GFP_NOIO, 1); | |
42 | bio->bi_sector = sector; | |
43 | bio->bi_bdev = bdev; | |
44 | bio->bi_end_io = hfsplus_end_io_sync; | |
45 | bio->bi_private = &wait; | |
46 | ||
47 | /* | |
48 | * We always submit one sector at a time, so bio_add_page must not fail. | |
49 | */ | |
50 | if (bio_add_page(bio, virt_to_page(data), HFSPLUS_SECTOR_SIZE, | |
51 | offset_in_page(data)) != HFSPLUS_SECTOR_SIZE) | |
52 | BUG(); | |
53 | ||
54 | submit_bio(rw, bio); | |
55 | wait_for_completion(&wait); | |
56 | ||
57 | if (!bio_flagged(bio, BIO_UPTODATE)) | |
50176dde SF |
58 | ret = -EIO; |
59 | ||
60 | bio_put(bio); | |
61 | return ret; | |
52399b17 CH |
62 | } |
63 | ||
1da177e4 LT |
64 | static int hfsplus_read_mdb(void *bufptr, struct hfsplus_wd *wd) |
65 | { | |
66 | u32 extent; | |
67 | u16 attrib; | |
2179d372 | 68 | __be16 sig; |
1da177e4 | 69 | |
2179d372 DE |
70 | sig = *(__be16 *)(bufptr + HFSP_WRAPOFF_EMBEDSIG); |
71 | if (sig != cpu_to_be16(HFSPLUS_VOLHEAD_SIG) && | |
72 | sig != cpu_to_be16(HFSPLUS_VOLHEAD_SIGX)) | |
1da177e4 LT |
73 | return 0; |
74 | ||
75 | attrib = be16_to_cpu(*(__be16 *)(bufptr + HFSP_WRAPOFF_ATTRIB)); | |
76 | if (!(attrib & HFSP_WRAP_ATTRIB_SLOCK) || | |
77 | !(attrib & HFSP_WRAP_ATTRIB_SPARED)) | |
78 | return 0; | |
79 | ||
2753cc28 AS |
80 | wd->ablk_size = |
81 | be32_to_cpu(*(__be32 *)(bufptr + HFSP_WRAPOFF_ABLKSIZE)); | |
1da177e4 LT |
82 | if (wd->ablk_size < HFSPLUS_SECTOR_SIZE) |
83 | return 0; | |
84 | if (wd->ablk_size % HFSPLUS_SECTOR_SIZE) | |
85 | return 0; | |
2753cc28 AS |
86 | wd->ablk_start = |
87 | be16_to_cpu(*(__be16 *)(bufptr + HFSP_WRAPOFF_ABLKSTART)); | |
1da177e4 | 88 | |
8b3789e5 | 89 | extent = get_unaligned_be32(bufptr + HFSP_WRAPOFF_EMBEDEXT); |
1da177e4 LT |
90 | wd->embed_start = (extent >> 16) & 0xFFFF; |
91 | wd->embed_count = extent & 0xFFFF; | |
92 | ||
93 | return 1; | |
94 | } | |
95 | ||
96 | static int hfsplus_get_last_session(struct super_block *sb, | |
97 | sector_t *start, sector_t *size) | |
98 | { | |
99 | struct cdrom_multisession ms_info; | |
100 | struct cdrom_tocentry te; | |
101 | int res; | |
102 | ||
103 | /* default values */ | |
104 | *start = 0; | |
105 | *size = sb->s_bdev->bd_inode->i_size >> 9; | |
106 | ||
dd73a01a CH |
107 | if (HFSPLUS_SB(sb)->session >= 0) { |
108 | te.cdte_track = HFSPLUS_SB(sb)->session; | |
1da177e4 | 109 | te.cdte_format = CDROM_LBA; |
2753cc28 AS |
110 | res = ioctl_by_bdev(sb->s_bdev, |
111 | CDROMREADTOCENTRY, (unsigned long)&te); | |
1da177e4 LT |
112 | if (!res && (te.cdte_ctrl & CDROM_DATA_TRACK) == 4) { |
113 | *start = (sector_t)te.cdte_addr.lba << 2; | |
114 | return 0; | |
115 | } | |
634725a9 | 116 | printk(KERN_ERR "hfs: invalid session number or type of track\n"); |
1da177e4 LT |
117 | return -EINVAL; |
118 | } | |
119 | ms_info.addr_format = CDROM_LBA; | |
2753cc28 AS |
120 | res = ioctl_by_bdev(sb->s_bdev, CDROMMULTISESSION, |
121 | (unsigned long)&ms_info); | |
1da177e4 LT |
122 | if (!res && ms_info.xa_flag) |
123 | *start = (sector_t)ms_info.addr.lba << 2; | |
124 | return 0; | |
125 | } | |
126 | ||
127 | /* Find the volume header and fill in some minimum bits in superblock */ | |
128 | /* Takes in super block, returns true if good data read */ | |
129 | int hfsplus_read_wrapper(struct super_block *sb) | |
130 | { | |
dd73a01a | 131 | struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb); |
1da177e4 LT |
132 | struct hfsplus_wd wd; |
133 | sector_t part_start, part_size; | |
134 | u32 blocksize; | |
52399b17 | 135 | int error = 0; |
1da177e4 | 136 | |
52399b17 | 137 | error = -EINVAL; |
1da177e4 LT |
138 | blocksize = sb_min_blocksize(sb, HFSPLUS_SECTOR_SIZE); |
139 | if (!blocksize) | |
52399b17 | 140 | goto out; |
1da177e4 LT |
141 | |
142 | if (hfsplus_get_last_session(sb, &part_start, &part_size)) | |
52399b17 | 143 | goto out; |
1da177e4 | 144 | |
52399b17 CH |
145 | error = -ENOMEM; |
146 | sbi->s_vhdr = kmalloc(HFSPLUS_SECTOR_SIZE, GFP_KERNEL); | |
147 | if (!sbi->s_vhdr) | |
148 | goto out; | |
149 | sbi->s_backup_vhdr = kmalloc(HFSPLUS_SECTOR_SIZE, GFP_KERNEL); | |
150 | if (!sbi->s_backup_vhdr) | |
151 | goto out_free_vhdr; | |
152 | ||
153 | reread: | |
154 | error = hfsplus_submit_bio(sb->s_bdev, | |
155 | part_start + HFSPLUS_VOLHEAD_SECTOR, | |
156 | sbi->s_vhdr, READ); | |
157 | if (error) | |
158 | goto out_free_backup_vhdr; | |
159 | ||
160 | error = -EINVAL; | |
161 | switch (sbi->s_vhdr->signature) { | |
162 | case cpu_to_be16(HFSPLUS_VOLHEAD_SIGX): | |
163 | set_bit(HFSPLUS_SB_HFSX, &sbi->flags); | |
164 | /*FALLTHRU*/ | |
165 | case cpu_to_be16(HFSPLUS_VOLHEAD_SIG): | |
166 | break; | |
167 | case cpu_to_be16(HFSP_WRAP_MAGIC): | |
168 | if (!hfsplus_read_mdb(sbi->s_vhdr, &wd)) | |
a1dbcef0 | 169 | goto out_free_backup_vhdr; |
52399b17 | 170 | wd.ablk_size >>= HFSPLUS_SECTOR_SHIFT; |
4ba2d5fd CH |
171 | part_start += (sector_t)wd.ablk_start + |
172 | (sector_t)wd.embed_start * wd.ablk_size; | |
173 | part_size = (sector_t)wd.embed_count * wd.ablk_size; | |
52399b17 CH |
174 | goto reread; |
175 | default: | |
176 | /* | |
177 | * Check for a partition block. | |
178 | * | |
1da177e4 LT |
179 | * (should do this only for cdrom/loop though) |
180 | */ | |
181 | if (hfs_part_find(sb, &part_start, &part_size)) | |
a1dbcef0 | 182 | goto out_free_backup_vhdr; |
52399b17 CH |
183 | goto reread; |
184 | } | |
185 | ||
186 | error = hfsplus_submit_bio(sb->s_bdev, | |
187 | part_start + part_size - 2, | |
188 | sbi->s_backup_vhdr, READ); | |
189 | if (error) | |
190 | goto out_free_backup_vhdr; | |
191 | ||
192 | error = -EINVAL; | |
193 | if (sbi->s_backup_vhdr->signature != sbi->s_vhdr->signature) { | |
194 | printk(KERN_WARNING | |
195 | "hfs: invalid secondary volume header\n"); | |
196 | goto out_free_backup_vhdr; | |
1da177e4 LT |
197 | } |
198 | ||
52399b17 | 199 | blocksize = be32_to_cpu(sbi->s_vhdr->blocksize); |
1da177e4 | 200 | |
52399b17 CH |
201 | /* |
202 | * Block size must be at least as large as a sector and a multiple of 2. | |
1da177e4 | 203 | */ |
52399b17 CH |
204 | if (blocksize < HFSPLUS_SECTOR_SIZE || ((blocksize - 1) & blocksize)) |
205 | goto out_free_backup_vhdr; | |
dd73a01a CH |
206 | sbi->alloc_blksz = blocksize; |
207 | sbi->alloc_blksz_shift = 0; | |
1da177e4 | 208 | while ((blocksize >>= 1) != 0) |
dd73a01a CH |
209 | sbi->alloc_blksz_shift++; |
210 | blocksize = min(sbi->alloc_blksz, (u32)PAGE_SIZE); | |
1da177e4 | 211 | |
52399b17 CH |
212 | /* |
213 | * Align block size to block offset. | |
214 | */ | |
1da177e4 LT |
215 | while (part_start & ((blocksize >> HFSPLUS_SECTOR_SHIFT) - 1)) |
216 | blocksize >>= 1; | |
217 | ||
218 | if (sb_set_blocksize(sb, blocksize) != blocksize) { | |
2753cc28 AS |
219 | printk(KERN_ERR "hfs: unable to set blocksize to %u!\n", |
220 | blocksize); | |
52399b17 | 221 | goto out_free_backup_vhdr; |
1da177e4 LT |
222 | } |
223 | ||
dd73a01a CH |
224 | sbi->blockoffset = |
225 | part_start >> (sb->s_blocksize_bits - HFSPLUS_SECTOR_SHIFT); | |
52399b17 | 226 | sbi->part_start = part_start; |
dd73a01a CH |
227 | sbi->sect_count = part_size; |
228 | sbi->fs_shift = sbi->alloc_blksz_shift - sb->s_blocksize_bits; | |
1da177e4 | 229 | return 0; |
52399b17 CH |
230 | |
231 | out_free_backup_vhdr: | |
232 | kfree(sbi->s_backup_vhdr); | |
233 | out_free_vhdr: | |
234 | kfree(sbi->s_vhdr); | |
235 | out: | |
236 | return error; | |
1da177e4 | 237 | } |