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authorKai Bankett <chaosman@ontika.net>2012-02-16 23:59:20 -0500
committerAl Viro <viro@zeniv.linux.org.uk>2012-03-20 21:29:38 -0400
commit5d026c7242201e7c9d0e12fcb2bcaffead9d59fd (patch)
tree3a3663fd35e3077574e30cf705a614ede69925eb /fs/qnx6
parent516cdb68e5b44ca1bef31619f5da8d5e9e298f88 (diff)
fs: initial qnx6fs addition
Adds support for qnx6fs readonly support to the linux kernel. * Mount option The option mmi_fs can be used to mount Harman Becker/Audi MMI 3G HDD qnx6fs filesystems. * Documentation A high level filesystem stucture description can be found in the Documentation/filesystems directory. (qnx6.txt) * Additional features - Active (stable) superblock selection - Superblock checksum check (enforced) - Supports mount of qnx6 filesystems with to host different endianess - Automatic endianess detection - Longfilename support (with non-enfocing crc check) - All blocksizes (512, 1024, 2048 and 4096 supported) Signed-off-by: Kai Bankett <chaosman@ontika.net> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/qnx6')
-rw-r--r--fs/qnx6/Kconfig26
-rw-r--r--fs/qnx6/Makefile7
-rw-r--r--fs/qnx6/README8
-rw-r--r--fs/qnx6/dir.c291
-rw-r--r--fs/qnx6/inode.c698
-rw-r--r--fs/qnx6/namei.c42
-rw-r--r--fs/qnx6/qnx6.h135
-rw-r--r--fs/qnx6/super_mmi.c150
8 files changed, 1357 insertions, 0 deletions
diff --git a/fs/qnx6/Kconfig b/fs/qnx6/Kconfig
new file mode 100644
index 000000000000..edbba5c17cc8
--- /dev/null
+++ b/fs/qnx6/Kconfig
@@ -0,0 +1,26 @@
1config QNX6FS_FS
2 tristate "QNX6 file system support (read only)"
3 depends on BLOCK && CRC32
4 help
5 This is the file system used by the real-time operating systems
6 QNX 6 (also called QNX RTP).
7 Further information is available at <http://www.qnx.com/>.
8 Say Y if you intend to mount QNX hard disks or floppies formatted
9 with a mkqnx6fs.
10 However, keep in mind that this currently is a readonly driver!
11
12 To compile this file system support as a module, choose M here: the
13 module will be called qnx6.
14
15 If you don't know whether you need it, then you don't need it:
16 answer N.
17
18config QNX6FS_DEBUG
19 bool "QNX6 debugging information"
20 depends on QNX6FS_FS
21 help
22 Turns on extended debugging output.
23
24 If you are not a developer working on the QNX6FS, you probably don't
25 want this:
26 answer N.
diff --git a/fs/qnx6/Makefile b/fs/qnx6/Makefile
new file mode 100644
index 000000000000..9dd06199afc9
--- /dev/null
+++ b/fs/qnx6/Makefile
@@ -0,0 +1,7 @@
1#
2# Makefile for the linux qnx4-filesystem routines.
3#
4
5obj-$(CONFIG_QNX6FS_FS) += qnx6.o
6
7qnx6-objs := inode.o dir.o namei.o super_mmi.o
diff --git a/fs/qnx6/README b/fs/qnx6/README
new file mode 100644
index 000000000000..116d622026cc
--- /dev/null
+++ b/fs/qnx6/README
@@ -0,0 +1,8 @@
1
2 This is a snapshot of the QNX6 filesystem for Linux.
3 Please send diffs and remarks to <chaosman@ontika.net> .
4
5Credits :
6
7Al Viro <viro@ZenIV.linux.org.uk> (endless patience with me & support ;))
8Kai Bankett <chaosman@ontika.net> (Maintainer)
diff --git a/fs/qnx6/dir.c b/fs/qnx6/dir.c
new file mode 100644
index 000000000000..dc597353db3b
--- /dev/null
+++ b/fs/qnx6/dir.c
@@ -0,0 +1,291 @@
1/*
2 * QNX6 file system, Linux implementation.
3 *
4 * Version : 1.0.0
5 *
6 * History :
7 *
8 * 01-02-2012 by Kai Bankett (chaosman@ontika.net) : first release.
9 * 16-02-2012 pagemap extension by Al Viro
10 *
11 */
12
13#include "qnx6.h"
14
15static unsigned qnx6_lfile_checksum(char *name, unsigned size)
16{
17 unsigned crc = 0;
18 char *end = name + size;
19 while (name < end) {
20 crc = ((crc >> 1) + *(name++)) ^
21 ((crc & 0x00000001) ? 0x80000000 : 0);
22 }
23 return crc;
24}
25
26static struct page *qnx6_get_page(struct inode *dir, unsigned long n)
27{
28 struct address_space *mapping = dir->i_mapping;
29 struct page *page = read_mapping_page(mapping, n, NULL);
30 if (!IS_ERR(page))
31 kmap(page);
32 return page;
33}
34
35static inline unsigned long dir_pages(struct inode *inode)
36{
37 return (inode->i_size+PAGE_CACHE_SIZE-1)>>PAGE_CACHE_SHIFT;
38}
39
40static unsigned last_entry(struct inode *inode, unsigned long page_nr)
41{
42 unsigned long last_byte = inode->i_size;
43 last_byte -= page_nr << PAGE_CACHE_SHIFT;
44 if (last_byte > PAGE_CACHE_SIZE)
45 last_byte = PAGE_CACHE_SIZE;
46 return last_byte / QNX6_DIR_ENTRY_SIZE;
47}
48
49static struct qnx6_long_filename *qnx6_longname(struct super_block *sb,
50 struct qnx6_long_dir_entry *de,
51 struct page **p)
52{
53 struct qnx6_sb_info *sbi = QNX6_SB(sb);
54 u32 s = fs32_to_cpu(sbi, de->de_long_inode); /* in block units */
55 u32 n = s >> (PAGE_CACHE_SHIFT - sb->s_blocksize_bits); /* in pages */
56 /* within page */
57 u32 offs = (s << sb->s_blocksize_bits) & ~PAGE_CACHE_MASK;
58 struct address_space *mapping = sbi->longfile->i_mapping;
59 struct page *page = read_mapping_page(mapping, n, NULL);
60 if (IS_ERR(page))
61 return ERR_CAST(page);
62 kmap(*p = page);
63 return (struct qnx6_long_filename *)(page_address(page) + offs);
64}
65
66static int qnx6_dir_longfilename(struct inode *inode,
67 struct qnx6_long_dir_entry *de,
68 void *dirent, loff_t pos,
69 unsigned de_inode, filldir_t filldir)
70{
71 struct qnx6_long_filename *lf;
72 struct super_block *s = inode->i_sb;
73 struct qnx6_sb_info *sbi = QNX6_SB(s);
74 struct page *page;
75 int lf_size;
76
77 if (de->de_size != 0xff) {
78 /* error - long filename entries always have size 0xff
79 in direntry */
80 printk(KERN_ERR "qnx6: invalid direntry size (%i).\n",
81 de->de_size);
82 return 0;
83 }
84 lf = qnx6_longname(s, de, &page);
85 if (IS_ERR(lf)) {
86 printk(KERN_ERR "qnx6:Error reading longname\n");
87 return 0;
88 }
89
90 lf_size = fs16_to_cpu(sbi, lf->lf_size);
91
92 if (lf_size > QNX6_LONG_NAME_MAX) {
93 QNX6DEBUG((KERN_INFO "file %s\n", lf->lf_fname));
94 printk(KERN_ERR "qnx6:Filename too long (%i)\n", lf_size);
95 qnx6_put_page(page);
96 return 0;
97 }
98
99 /* calc & validate longfilename checksum
100 mmi 3g filesystem does not have that checksum */
101 if (!test_opt(s, MMI_FS) && fs32_to_cpu(sbi, de->de_checksum) !=
102 qnx6_lfile_checksum(lf->lf_fname, lf_size))
103 printk(KERN_INFO "qnx6: long filename checksum error.\n");
104
105 QNX6DEBUG((KERN_INFO "qnx6_readdir:%.*s inode:%u\n",
106 lf_size, lf->lf_fname, de_inode));
107 if (filldir(dirent, lf->lf_fname, lf_size, pos, de_inode,
108 DT_UNKNOWN) < 0) {
109 qnx6_put_page(page);
110 return 0;
111 }
112
113 qnx6_put_page(page);
114 /* success */
115 return 1;
116}
117
118static int qnx6_readdir(struct file *filp, void *dirent, filldir_t filldir)
119{
120 struct inode *inode = filp->f_path.dentry->d_inode;
121 struct super_block *s = inode->i_sb;
122 struct qnx6_sb_info *sbi = QNX6_SB(s);
123 loff_t pos = filp->f_pos & (QNX6_DIR_ENTRY_SIZE - 1);
124 unsigned long npages = dir_pages(inode);
125 unsigned long n = pos >> PAGE_CACHE_SHIFT;
126 unsigned start = (pos & ~PAGE_CACHE_MASK) / QNX6_DIR_ENTRY_SIZE;
127 bool done = false;
128
129 if (filp->f_pos >= inode->i_size)
130 return 0;
131
132 for ( ; !done && n < npages; n++, start = 0) {
133 struct page *page = qnx6_get_page(inode, n);
134 int limit = last_entry(inode, n);
135 struct qnx6_dir_entry *de;
136 int i = start;
137
138 if (IS_ERR(page)) {
139 printk(KERN_ERR "qnx6_readdir: read failed\n");
140 filp->f_pos = (n + 1) << PAGE_CACHE_SHIFT;
141 return PTR_ERR(page);
142 }
143 de = ((struct qnx6_dir_entry *)page_address(page)) + start;
144 for (; i < limit; i++, de++, pos += QNX6_DIR_ENTRY_SIZE) {
145 int size = de->de_size;
146 u32 no_inode = fs32_to_cpu(sbi, de->de_inode);
147
148 if (!no_inode || !size)
149 continue;
150
151 if (size > QNX6_SHORT_NAME_MAX) {
152 /* long filename detected
153 get the filename from long filename
154 structure / block */
155 if (!qnx6_dir_longfilename(inode,
156 (struct qnx6_long_dir_entry *)de,
157 dirent, pos, no_inode,
158 filldir)) {
159 done = true;
160 break;
161 }
162 } else {
163 QNX6DEBUG((KERN_INFO "qnx6_readdir:%.*s"
164 " inode:%u\n", size, de->de_fname,
165 no_inode));
166 if (filldir(dirent, de->de_fname, size,
167 pos, no_inode, DT_UNKNOWN)
168 < 0) {
169 done = true;
170 break;
171 }
172 }
173 }
174 qnx6_put_page(page);
175 }
176 filp->f_pos = pos;
177 return 0;
178}
179
180/*
181 * check if the long filename is correct.
182 */
183static unsigned qnx6_long_match(int len, const char *name,
184 struct qnx6_long_dir_entry *de, struct inode *dir)
185{
186 struct super_block *s = dir->i_sb;
187 struct qnx6_sb_info *sbi = QNX6_SB(s);
188 struct page *page;
189 int thislen;
190 struct qnx6_long_filename *lf = qnx6_longname(s, de, &page);
191
192 if (IS_ERR(lf))
193 return 0;
194
195 thislen = fs16_to_cpu(sbi, lf->lf_size);
196 if (len != thislen) {
197 qnx6_put_page(page);
198 return 0;
199 }
200 if (memcmp(name, lf->lf_fname, len) == 0) {
201 qnx6_put_page(page);
202 return fs32_to_cpu(sbi, de->de_inode);
203 }
204 qnx6_put_page(page);
205 return 0;
206}
207
208/*
209 * check if the filename is correct.
210 */
211static unsigned qnx6_match(struct super_block *s, int len, const char *name,
212 struct qnx6_dir_entry *de)
213{
214 struct qnx6_sb_info *sbi = QNX6_SB(s);
215 if (memcmp(name, de->de_fname, len) == 0)
216 return fs32_to_cpu(sbi, de->de_inode);
217 return 0;
218}
219
220
221unsigned qnx6_find_entry(int len, struct inode *dir, const char *name,
222 struct page **res_page)
223{
224 struct super_block *s = dir->i_sb;
225 struct qnx6_inode_info *ei = QNX6_I(dir);
226 struct page *page = NULL;
227 unsigned long start, n;
228 unsigned long npages = dir_pages(dir);
229 unsigned ino;
230 struct qnx6_dir_entry *de;
231 struct qnx6_long_dir_entry *lde;
232
233 *res_page = NULL;
234
235 if (npages == 0)
236 return 0;
237 start = ei->i_dir_start_lookup;
238 if (start >= npages)
239 start = 0;
240 n = start;
241
242 do {
243 page = qnx6_get_page(dir, n);
244 if (!IS_ERR(page)) {
245 int limit = last_entry(dir, n);
246 int i;
247
248 de = (struct qnx6_dir_entry *)page_address(page);
249 for (i = 0; i < limit; i++, de++) {
250 if (len <= QNX6_SHORT_NAME_MAX) {
251 /* short filename */
252 if (len != de->de_size)
253 continue;
254 ino = qnx6_match(s, len, name, de);
255 if (ino)
256 goto found;
257 } else if (de->de_size == 0xff) {
258 /* deal with long filename */
259 lde = (struct qnx6_long_dir_entry *)de;
260 ino = qnx6_long_match(len,
261 name, lde, dir);
262 if (ino)
263 goto found;
264 } else
265 printk(KERN_ERR "qnx6: undefined "
266 "filename size in inode.\n");
267 }
268 qnx6_put_page(page);
269 }
270
271 if (++n >= npages)
272 n = 0;
273 } while (n != start);
274 return 0;
275
276found:
277 *res_page = page;
278 ei->i_dir_start_lookup = n;
279 return ino;
280}
281
282const struct file_operations qnx6_dir_operations = {
283 .llseek = generic_file_llseek,
284 .read = generic_read_dir,
285 .readdir = qnx6_readdir,
286 .fsync = generic_file_fsync,
287};
288
289const struct inode_operations qnx6_dir_inode_operations = {
290 .lookup = qnx6_lookup,
291};
diff --git a/fs/qnx6/inode.c b/fs/qnx6/inode.c
new file mode 100644
index 000000000000..e44012dc5645
--- /dev/null
+++ b/fs/qnx6/inode.c
@@ -0,0 +1,698 @@
1/*
2 * QNX6 file system, Linux implementation.
3 *
4 * Version : 1.0.0
5 *
6 * History :
7 *
8 * 01-02-2012 by Kai Bankett (chaosman@ontika.net) : first release.
9 * 16-02-2012 pagemap extension by Al Viro
10 *
11 */
12
13#include <linux/module.h>
14#include <linux/init.h>
15#include <linux/slab.h>
16#include <linux/highuid.h>
17#include <linux/pagemap.h>
18#include <linux/buffer_head.h>
19#include <linux/writeback.h>
20#include <linux/statfs.h>
21#include <linux/parser.h>
22#include <linux/seq_file.h>
23#include <linux/mount.h>
24#include <linux/crc32.h>
25#include <linux/mpage.h>
26#include "qnx6.h"
27
28static const struct super_operations qnx6_sops;
29
30static void qnx6_put_super(struct super_block *sb);
31static struct inode *qnx6_alloc_inode(struct super_block *sb);
32static void qnx6_destroy_inode(struct inode *inode);
33static int qnx6_remount(struct super_block *sb, int *flags, char *data);
34static int qnx6_statfs(struct dentry *dentry, struct kstatfs *buf);
35static int qnx6_show_options(struct seq_file *seq, struct dentry *root);
36
37static const struct super_operations qnx6_sops = {
38 .alloc_inode = qnx6_alloc_inode,
39 .destroy_inode = qnx6_destroy_inode,
40 .put_super = qnx6_put_super,
41 .statfs = qnx6_statfs,
42 .remount_fs = qnx6_remount,
43 .show_options = qnx6_show_options,
44};
45
46static int qnx6_show_options(struct seq_file *seq, struct dentry *root)
47{
48 struct super_block *sb = root->d_sb;
49 struct qnx6_sb_info *sbi = QNX6_SB(sb);
50
51 if (sbi->s_mount_opt & QNX6_MOUNT_MMI_FS)
52 seq_puts(seq, ",mmi_fs");
53 return 0;
54}
55
56static int qnx6_remount(struct super_block *sb, int *flags, char *data)
57{
58 *flags |= MS_RDONLY;
59 return 0;
60}
61
62static unsigned qnx6_get_devblock(struct super_block *sb, __fs32 block)
63{
64 struct qnx6_sb_info *sbi = QNX6_SB(sb);
65 return fs32_to_cpu(sbi, block) + sbi->s_blks_off;
66}
67
68static unsigned qnx6_block_map(struct inode *inode, unsigned iblock);
69
70static int qnx6_get_block(struct inode *inode, sector_t iblock,
71 struct buffer_head *bh, int create)
72{
73 unsigned phys;
74
75 QNX6DEBUG((KERN_INFO "qnx6: qnx6_get_block inode=[%ld] iblock=[%ld]\n",
76 inode->i_ino, (unsigned long)iblock));
77
78 phys = qnx6_block_map(inode, iblock);
79 if (phys) {
80 /* logical block is before EOF */
81 map_bh(bh, inode->i_sb, phys);
82 }
83 return 0;
84}
85
86static int qnx6_check_blockptr(__fs32 ptr)
87{
88 if (ptr == ~(__fs32)0) {
89 printk(KERN_ERR "qnx6: hit unused blockpointer.\n");
90 return 0;
91 }
92 return 1;
93}
94
95static int qnx6_readpage(struct file *file, struct page *page)
96{
97 return mpage_readpage(page, qnx6_get_block);
98}
99
100static int qnx6_readpages(struct file *file, struct address_space *mapping,
101 struct list_head *pages, unsigned nr_pages)
102{
103 return mpage_readpages(mapping, pages, nr_pages, qnx6_get_block);
104}
105
106/*
107 * returns the block number for the no-th element in the tree
108 * inodebits requred as there are multiple inodes in one inode block
109 */
110static unsigned qnx6_block_map(struct inode *inode, unsigned no)
111{
112 struct super_block *s = inode->i_sb;
113 struct qnx6_sb_info *sbi = QNX6_SB(s);
114 struct qnx6_inode_info *ei = QNX6_I(inode);
115 unsigned block = 0;
116 struct buffer_head *bh;
117 __fs32 ptr;
118 int levelptr;
119 int ptrbits = sbi->s_ptrbits;
120 int bitdelta;
121 u32 mask = (1 << ptrbits) - 1;
122 int depth = ei->di_filelevels;
123 int i;
124
125 bitdelta = ptrbits * depth;
126 levelptr = no >> bitdelta;
127
128 if (levelptr > QNX6_NO_DIRECT_POINTERS - 1) {
129 printk(KERN_ERR "qnx6:Requested file block number (%u) too big.",
130 no);
131 return 0;
132 }
133
134 block = qnx6_get_devblock(s, ei->di_block_ptr[levelptr]);
135
136 for (i = 0; i < depth; i++) {
137 bh = sb_bread(s, block);
138 if (!bh) {
139 printk(KERN_ERR "qnx6:Error reading block (%u)\n",
140 block);
141 return 0;
142 }
143 bitdelta -= ptrbits;
144 levelptr = (no >> bitdelta) & mask;
145 ptr = ((__fs32 *)bh->b_data)[levelptr];
146
147 if (!qnx6_check_blockptr(ptr))
148 return 0;
149
150 block = qnx6_get_devblock(s, ptr);
151 brelse(bh);
152 }
153 return block;
154}
155
156static int qnx6_statfs(struct dentry *dentry, struct kstatfs *buf)
157{
158 struct super_block *sb = dentry->d_sb;
159 struct qnx6_sb_info *sbi = QNX6_SB(sb);
160 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
161
162 buf->f_type = sb->s_magic;
163 buf->f_bsize = sb->s_blocksize;
164 buf->f_blocks = fs32_to_cpu(sbi, sbi->sb->sb_num_blocks);
165 buf->f_bfree = fs32_to_cpu(sbi, sbi->sb->sb_free_blocks);
166 buf->f_files = fs32_to_cpu(sbi, sbi->sb->sb_num_inodes);
167 buf->f_ffree = fs32_to_cpu(sbi, sbi->sb->sb_free_inodes);
168 buf->f_bavail = buf->f_bfree;
169 buf->f_namelen = QNX6_LONG_NAME_MAX;
170 buf->f_fsid.val[0] = (u32)id;
171 buf->f_fsid.val[1] = (u32)(id >> 32);
172
173 return 0;
174}
175
176/*
177 * Check the root directory of the filesystem to make sure
178 * it really _is_ a qnx6 filesystem, and to check the size
179 * of the directory entry.
180 */
181static const char *qnx6_checkroot(struct super_block *s)
182{
183 static char match_root[2][3] = {".\0\0", "..\0"};
184 int i, error = 0;
185 struct qnx6_dir_entry *dir_entry;
186 struct inode *root = s->s_root->d_inode;
187 struct address_space *mapping = root->i_mapping;
188 struct page *page = read_mapping_page(mapping, 0, NULL);
189 if (IS_ERR(page))
190 return "error reading root directory";
191 kmap(page);
192 dir_entry = page_address(page);
193 for (i = 0; i < 2; i++) {
194 /* maximum 3 bytes - due to match_root limitation */
195 if (strncmp(dir_entry[i].de_fname, match_root[i], 3))
196 error = 1;
197 }
198 qnx6_put_page(page);
199 if (error)
200 return "error reading root directory.";
201 return NULL;
202}
203
204#ifdef CONFIG_QNX6FS_DEBUG
205void qnx6_superblock_debug(struct qnx6_super_block *sb, struct super_block *s)
206{
207 struct qnx6_sb_info *sbi = QNX6_SB(s);
208
209 QNX6DEBUG((KERN_INFO "magic: %08x\n",
210 fs32_to_cpu(sbi, sb->sb_magic)));
211 QNX6DEBUG((KERN_INFO "checksum: %08x\n",
212 fs32_to_cpu(sbi, sb->sb_checksum)));
213 QNX6DEBUG((KERN_INFO "serial: %llx\n",
214 fs64_to_cpu(sbi, sb->sb_serial)));
215 QNX6DEBUG((KERN_INFO "flags: %08x\n",
216 fs32_to_cpu(sbi, sb->sb_flags)));
217 QNX6DEBUG((KERN_INFO "blocksize: %08x\n",
218 fs32_to_cpu(sbi, sb->sb_blocksize)));
219 QNX6DEBUG((KERN_INFO "num_inodes: %08x\n",
220 fs32_to_cpu(sbi, sb->sb_num_inodes)));
221 QNX6DEBUG((KERN_INFO "free_inodes: %08x\n",
222 fs32_to_cpu(sbi, sb->sb_free_inodes)));
223 QNX6DEBUG((KERN_INFO "num_blocks: %08x\n",
224 fs32_to_cpu(sbi, sb->sb_num_blocks)));
225 QNX6DEBUG((KERN_INFO "free_blocks: %08x\n",
226 fs32_to_cpu(sbi, sb->sb_free_blocks)));
227 QNX6DEBUG((KERN_INFO "inode_levels: %02x\n",
228 sb->Inode.levels));
229}
230#endif
231
232enum {
233 Opt_mmifs,
234 Opt_err
235};
236
237static const match_table_t tokens = {
238 {Opt_mmifs, "mmi_fs"},
239 {Opt_err, NULL}
240};
241
242static int qnx6_parse_options(char *options, struct super_block *sb)
243{
244 char *p;
245 struct qnx6_sb_info *sbi = QNX6_SB(sb);
246 substring_t args[MAX_OPT_ARGS];
247
248 if (!options)
249 return 1;
250
251 while ((p = strsep(&options, ",")) != NULL) {
252 int token;
253 if (!*p)
254 continue;
255
256 token = match_token(p, tokens, args);
257 switch (token) {
258 case Opt_mmifs:
259 set_opt(sbi->s_mount_opt, MMI_FS);
260 break;
261 default:
262 return 0;
263 }
264 }
265 return 1;
266}
267
268static struct buffer_head *qnx6_check_first_superblock(struct super_block *s,
269 int offset, int silent)
270{
271 struct qnx6_sb_info *sbi = QNX6_SB(s);
272 struct buffer_head *bh;
273 struct qnx6_super_block *sb;
274
275 /* Check the superblock signatures
276 start with the first superblock */
277 bh = sb_bread(s, offset);
278 if (!bh) {
279 printk(KERN_ERR "qnx6: unable to read the first superblock\n");
280 return NULL;
281 }
282 sb = (struct qnx6_super_block *)bh->b_data;
283 if (fs32_to_cpu(sbi, sb->sb_magic) != QNX6_SUPER_MAGIC) {
284 sbi->s_bytesex = BYTESEX_BE;
285 if (fs32_to_cpu(sbi, sb->sb_magic) == QNX6_SUPER_MAGIC) {
286 /* we got a big endian fs */
287 QNX6DEBUG((KERN_INFO "qnx6: fs got different"
288 " endianess.\n"));
289 return bh;
290 } else
291 sbi->s_bytesex = BYTESEX_LE;
292 if (!silent) {
293 if (offset == 0) {
294 printk(KERN_ERR "qnx6: wrong signature (magic)"
295 " in superblock #1.\n");
296 } else {
297 printk(KERN_INFO "qnx6: wrong signature (magic)"
298 " at position (0x%lx) - will try"
299 " alternative position (0x0000).\n",
300 offset * s->s_blocksize);
301 }
302 }
303 brelse(bh);
304 return NULL;
305 }
306 return bh;
307}
308
309static struct inode *qnx6_private_inode(struct super_block *s,
310 struct qnx6_root_node *p);
311
312static int qnx6_fill_super(struct super_block *s, void *data, int silent)
313{
314 struct buffer_head *bh1 = NULL, *bh2 = NULL;
315 struct qnx6_super_block *sb1 = NULL, *sb2 = NULL;
316 struct qnx6_sb_info *sbi;
317 struct inode *root;
318 const char *errmsg;
319 struct qnx6_sb_info *qs;
320 int ret = -EINVAL;
321 u64 offset;
322 int bootblock_offset = QNX6_BOOTBLOCK_SIZE;
323
324 qs = kzalloc(sizeof(struct qnx6_sb_info), GFP_KERNEL);
325 if (!qs)
326 return -ENOMEM;
327 s->s_fs_info = qs;
328
329 /* Superblock always is 512 Byte long */
330 if (!sb_set_blocksize(s, QNX6_SUPERBLOCK_SIZE)) {
331 printk(KERN_ERR "qnx6: unable to set blocksize\n");
332 goto outnobh;
333 }
334
335 /* parse the mount-options */
336 if (!qnx6_parse_options((char *) data, s)) {
337 printk(KERN_ERR "qnx6: invalid mount options.\n");
338 goto outnobh;
339 }
340 if (test_opt(s, MMI_FS)) {
341 sb1 = qnx6_mmi_fill_super(s, silent);
342 if (sb1)
343 goto mmi_success;
344 else
345 goto outnobh;
346 }
347 sbi = QNX6_SB(s);
348 sbi->s_bytesex = BYTESEX_LE;
349 /* Check the superblock signatures
350 start with the first superblock */
351 bh1 = qnx6_check_first_superblock(s,
352 bootblock_offset / QNX6_SUPERBLOCK_SIZE, silent);
353 if (!bh1) {
354 /* try again without bootblock offset */
355 bh1 = qnx6_check_first_superblock(s, 0, silent);
356 if (!bh1) {
357 printk(KERN_ERR "qnx6: unable to read the first superblock\n");
358 goto outnobh;
359 }
360 /* seems that no bootblock at partition start */
361 bootblock_offset = 0;
362 }
363 sb1 = (struct qnx6_super_block *)bh1->b_data;
364
365#ifdef CONFIG_QNX6FS_DEBUG
366 qnx6_superblock_debug(sb1, s);
367#endif
368
369 /* checksum check - start at byte 8 and end at byte 512 */
370 if (fs32_to_cpu(sbi, sb1->sb_checksum) !=
371 crc32_be(0, (char *)(bh1->b_data + 8), 504)) {
372 printk(KERN_ERR "qnx6: superblock #1 checksum error\n");
373 goto out;
374 }
375
376 /* set new blocksize */
377 if (!sb_set_blocksize(s, fs32_to_cpu(sbi, sb1->sb_blocksize))) {
378 printk(KERN_ERR "qnx6: unable to set blocksize\n");
379 goto out;
380 }
381 /* blocksize invalidates bh - pull it back in */
382 brelse(bh1);
383 bh1 = sb_bread(s, bootblock_offset >> s->s_blocksize_bits);
384 if (!bh1)
385 goto outnobh;
386 sb1 = (struct qnx6_super_block *)bh1->b_data;
387
388 /* calculate second superblock blocknumber */
389 offset = fs32_to_cpu(sbi, sb1->sb_num_blocks) +
390 (bootblock_offset >> s->s_blocksize_bits) +
391 (QNX6_SUPERBLOCK_AREA >> s->s_blocksize_bits);
392
393 /* set bootblock offset */
394 sbi->s_blks_off = (bootblock_offset >> s->s_blocksize_bits) +
395 (QNX6_SUPERBLOCK_AREA >> s->s_blocksize_bits);
396
397 /* next the second superblock */
398 bh2 = sb_bread(s, offset);
399 if (!bh2) {
400 printk(KERN_ERR "qnx6: unable to read the second superblock\n");
401 goto out;
402 }
403 sb2 = (struct qnx6_super_block *)bh2->b_data;
404 if (fs32_to_cpu(sbi, sb2->sb_magic) != QNX6_SUPER_MAGIC) {
405 if (!silent)
406 printk(KERN_ERR "qnx6: wrong signature (magic)"
407 " in superblock #2.\n");
408 goto out;
409 }
410
411 /* checksum check - start at byte 8 and end at byte 512 */
412 if (fs32_to_cpu(sbi, sb2->sb_checksum) !=
413 crc32_be(0, (char *)(bh2->b_data + 8), 504)) {
414 printk(KERN_ERR "qnx6: superblock #2 checksum error\n");
415 goto out;
416 }
417
418 if (fs64_to_cpu(sbi, sb1->sb_serial) >=
419 fs64_to_cpu(sbi, sb2->sb_serial)) {
420 /* superblock #1 active */
421 sbi->sb_buf = bh1;
422 sbi->sb = (struct qnx6_super_block *)bh1->b_data;
423 brelse(bh2);
424 printk(KERN_INFO "qnx6: superblock #1 active\n");
425 } else {
426 /* superblock #2 active */
427 sbi->sb_buf = bh2;
428 sbi->sb = (struct qnx6_super_block *)bh2->b_data;
429 brelse(bh1);
430 printk(KERN_INFO "qnx6: superblock #2 active\n");
431 }
432mmi_success:
433 /* sanity check - limit maximum indirect pointer levels */
434 if (sb1->Inode.levels > QNX6_PTR_MAX_LEVELS) {
435 printk(KERN_ERR "qnx6: too many inode levels (max %i, sb %i)\n",
436 QNX6_PTR_MAX_LEVELS, sb1->Inode.levels);
437 goto out;
438 }
439 if (sb1->Longfile.levels > QNX6_PTR_MAX_LEVELS) {
440 printk(KERN_ERR "qnx6: too many longfilename levels"
441 " (max %i, sb %i)\n",
442 QNX6_PTR_MAX_LEVELS, sb1->Longfile.levels);
443 goto out;
444 }
445 s->s_op = &qnx6_sops;
446 s->s_magic = QNX6_SUPER_MAGIC;
447 s->s_flags |= MS_RDONLY; /* Yup, read-only yet */
448
449 /* ease the later tree level calculations */
450 sbi = QNX6_SB(s);
451 sbi->s_ptrbits = ilog2(s->s_blocksize / 4);
452 sbi->inodes = qnx6_private_inode(s, &sb1->Inode);
453 if (!sbi->inodes)
454 goto out;
455 sbi->longfile = qnx6_private_inode(s, &sb1->Longfile);
456 if (!sbi->longfile)
457 goto out1;
458
459 /* prefetch root inode */
460 root = qnx6_iget(s, QNX6_ROOT_INO);
461 if (IS_ERR(root)) {
462 printk(KERN_ERR "qnx6: get inode failed\n");
463 ret = PTR_ERR(root);
464 goto out2;
465 }
466
467 ret = -ENOMEM;
468 s->s_root = d_make_root(root);
469 if (!s->s_root)
470 goto out2;
471
472 ret = -EINVAL;
473 errmsg = qnx6_checkroot(s);
474 if (errmsg != NULL) {
475 if (!silent)
476 printk(KERN_ERR "qnx6: %s\n", errmsg);
477 goto out3;
478 }
479 return 0;
480
481out3:
482 dput(s->s_root);
483 s->s_root = NULL;
484out2:
485 iput(sbi->longfile);
486out1:
487 iput(sbi->inodes);
488out:
489 if (bh1)
490 brelse(bh1);
491 if (bh2)
492 brelse(bh2);
493outnobh:
494 kfree(qs);
495 s->s_fs_info = NULL;
496 return ret;
497}
498
499static void qnx6_put_super(struct super_block *sb)
500{
501 struct qnx6_sb_info *qs = QNX6_SB(sb);
502 brelse(qs->sb_buf);
503 iput(qs->longfile);
504 iput(qs->inodes);
505 kfree(qs);
506 sb->s_fs_info = NULL;
507 return;
508}
509
510static sector_t qnx6_bmap(struct address_space *mapping, sector_t block)
511{
512 return generic_block_bmap(mapping, block, qnx6_get_block);
513}
514static const struct address_space_operations qnx6_aops = {
515 .readpage = qnx6_readpage,
516 .readpages = qnx6_readpages,
517 .bmap = qnx6_bmap
518};
519
520static struct inode *qnx6_private_inode(struct super_block *s,
521 struct qnx6_root_node *p)
522{
523 struct inode *inode = new_inode(s);
524 if (inode) {
525 struct qnx6_inode_info *ei = QNX6_I(inode);
526 struct qnx6_sb_info *sbi = QNX6_SB(s);
527 inode->i_size = fs64_to_cpu(sbi, p->size);
528 memcpy(ei->di_block_ptr, p->ptr, sizeof(p->ptr));
529 ei->di_filelevels = p->levels;
530 inode->i_mode = S_IFREG | S_IRUSR; /* probably wrong */
531 inode->i_mapping->a_ops = &qnx6_aops;
532 }
533 return inode;
534}
535
536struct inode *qnx6_iget(struct super_block *sb, unsigned ino)
537{
538 struct qnx6_sb_info *sbi = QNX6_SB(sb);
539 struct qnx6_inode_entry *raw_inode;
540 struct inode *inode;
541 struct qnx6_inode_info *ei;
542 struct address_space *mapping;
543 struct page *page;
544 u32 n, offs;
545
546 inode = iget_locked(sb, ino);
547 if (!inode)
548 return ERR_PTR(-ENOMEM);
549 if (!(inode->i_state & I_NEW))
550 return inode;
551
552 ei = QNX6_I(inode);
553
554 inode->i_mode = 0;
555
556 if (ino == 0) {
557 printk(KERN_ERR "qnx6: bad inode number on dev %s: %u is "
558 "out of range\n",
559 sb->s_id, ino);
560 iget_failed(inode);
561 return ERR_PTR(-EIO);
562 }
563 n = (ino - 1) >> (PAGE_CACHE_SHIFT - QNX6_INODE_SIZE_BITS);
564 offs = (ino - 1) & (~PAGE_CACHE_MASK >> QNX6_INODE_SIZE_BITS);
565 mapping = sbi->inodes->i_mapping;
566 page = read_mapping_page(mapping, n, NULL);
567 if (IS_ERR(page)) {
568 printk(KERN_ERR "qnx6: major problem: unable to read inode from "
569 "dev %s\n", sb->s_id);
570 iget_failed(inode);
571 return ERR_CAST(page);
572 }
573 kmap(page);
574 raw_inode = ((struct qnx6_inode_entry *)page_address(page)) + offs;
575
576 inode->i_mode = fs16_to_cpu(sbi, raw_inode->di_mode);
577 inode->i_uid = (uid_t)fs32_to_cpu(sbi, raw_inode->di_uid);
578 inode->i_gid = (gid_t)fs32_to_cpu(sbi, raw_inode->di_gid);
579 inode->i_size = fs64_to_cpu(sbi, raw_inode->di_size);
580 inode->i_mtime.tv_sec = fs32_to_cpu(sbi, raw_inode->di_mtime);
581 inode->i_mtime.tv_nsec = 0;
582 inode->i_atime.tv_sec = fs32_to_cpu(sbi, raw_inode->di_atime);
583 inode->i_atime.tv_nsec = 0;
584 inode->i_ctime.tv_sec = fs32_to_cpu(sbi, raw_inode->di_ctime);
585 inode->i_ctime.tv_nsec = 0;
586
587 /* calc blocks based on 512 byte blocksize */
588 inode->i_blocks = (inode->i_size + 511) >> 9;
589
590 memcpy(&ei->di_block_ptr, &raw_inode->di_block_ptr,
591 sizeof(raw_inode->di_block_ptr));
592 ei->di_filelevels = raw_inode->di_filelevels;
593
594 if (S_ISREG(inode->i_mode)) {
595 inode->i_fop = &generic_ro_fops;
596 inode->i_mapping->a_ops = &qnx6_aops;
597 } else if (S_ISDIR(inode->i_mode)) {
598 inode->i_op = &qnx6_dir_inode_operations;
599 inode->i_fop = &qnx6_dir_operations;
600 inode->i_mapping->a_ops = &qnx6_aops;
601 } else if (S_ISLNK(inode->i_mode)) {
602 inode->i_op = &page_symlink_inode_operations;
603 inode->i_mapping->a_ops = &qnx6_aops;
604 } else
605 init_special_inode(inode, inode->i_mode, 0);
606 qnx6_put_page(page);
607 unlock_new_inode(inode);
608 return inode;
609}
610
611static struct kmem_cache *qnx6_inode_cachep;
612
613static struct inode *qnx6_alloc_inode(struct super_block *sb)
614{
615 struct qnx6_inode_info *ei;
616 ei = kmem_cache_alloc(qnx6_inode_cachep, GFP_KERNEL);
617 if (!ei)
618 return NULL;
619 return &ei->vfs_inode;
620}
621
622static void qnx6_i_callback(struct rcu_head *head)
623{
624 struct inode *inode = container_of(head, struct inode, i_rcu);
625 INIT_LIST_HEAD(&inode->i_dentry);
626 kmem_cache_free(qnx6_inode_cachep, QNX6_I(inode));
627}
628
629static void qnx6_destroy_inode(struct inode *inode)
630{
631 call_rcu(&inode->i_rcu, qnx6_i_callback);
632}
633
634static void init_once(void *foo)
635{
636 struct qnx6_inode_info *ei = (struct qnx6_inode_info *) foo;
637
638 inode_init_once(&ei->vfs_inode);
639}
640
641static int init_inodecache(void)
642{
643 qnx6_inode_cachep = kmem_cache_create("qnx6_inode_cache",
644 sizeof(struct qnx6_inode_info),
645 0, (SLAB_RECLAIM_ACCOUNT|
646 SLAB_MEM_SPREAD),
647 init_once);
648 if (!qnx6_inode_cachep)
649 return -ENOMEM;
650 return 0;
651}
652
653static void destroy_inodecache(void)
654{
655 kmem_cache_destroy(qnx6_inode_cachep);
656}
657
658static struct dentry *qnx6_mount(struct file_system_type *fs_type,
659 int flags, const char *dev_name, void *data)
660{
661 return mount_bdev(fs_type, flags, dev_name, data, qnx6_fill_super);
662}
663
664static struct file_system_type qnx6_fs_type = {
665 .owner = THIS_MODULE,
666 .name = "qnx6",
667 .mount = qnx6_mount,
668 .kill_sb = kill_block_super,
669 .fs_flags = FS_REQUIRES_DEV,
670};
671
672static int __init init_qnx6_fs(void)
673{
674 int err;
675
676 err = init_inodecache();
677 if (err)
678 return err;
679
680 err = register_filesystem(&qnx6_fs_type);
681 if (err) {
682 destroy_inodecache();
683 return err;
684 }
685
686 printk(KERN_INFO "QNX6 filesystem 1.0.0 registered.\n");
687 return 0;
688}
689
690static void __exit exit_qnx6_fs(void)
691{
692 unregister_filesystem(&qnx6_fs_type);
693 destroy_inodecache();
694}
695
696module_init(init_qnx6_fs)
697module_exit(exit_qnx6_fs)
698MODULE_LICENSE("GPL");
diff --git a/fs/qnx6/namei.c b/fs/qnx6/namei.c
new file mode 100644
index 000000000000..8a97289e04ad
--- /dev/null
+++ b/fs/qnx6/namei.c
@@ -0,0 +1,42 @@
1/*
2 * QNX6 file system, Linux implementation.
3 *
4 * Version : 1.0.0
5 *
6 * History :
7 *
8 * 01-02-2012 by Kai Bankett (chaosman@ontika.net) : first release.
9 * 16-02-2012 pagemap extension by Al Viro
10 *
11 */
12
13#include "qnx6.h"
14
15struct dentry *qnx6_lookup(struct inode *dir, struct dentry *dentry,
16 struct nameidata *nd)
17{
18 unsigned ino;
19 struct page *page;
20 struct inode *foundinode = NULL;
21 const char *name = dentry->d_name.name;
22 int len = dentry->d_name.len;
23
24 if (len > QNX6_LONG_NAME_MAX)
25 return ERR_PTR(-ENAMETOOLONG);
26
27 ino = qnx6_find_entry(len, dir, name, &page);
28 if (ino) {
29 foundinode = qnx6_iget(dir->i_sb, ino);
30 qnx6_put_page(page);
31 if (IS_ERR(foundinode)) {
32 QNX6DEBUG((KERN_ERR "qnx6: lookup->iget -> "
33 " error %ld\n", PTR_ERR(foundinode)));
34 return ERR_CAST(foundinode);
35 }
36 } else {
37 QNX6DEBUG((KERN_INFO "qnx6_lookup: not found %s\n", name));
38 return NULL;
39 }
40 d_add(dentry, foundinode);
41 return NULL;
42}
diff --git a/fs/qnx6/qnx6.h b/fs/qnx6/qnx6.h
new file mode 100644
index 000000000000..6c5e02a0b6a8
--- /dev/null
+++ b/fs/qnx6/qnx6.h
@@ -0,0 +1,135 @@
1/*
2 * QNX6 file system, Linux implementation.
3 *
4 * Version : 1.0.0
5 *
6 * History :
7 *
8 * 01-02-2012 by Kai Bankett (chaosman@ontika.net) : first release.
9 * 16-02-2012 page map extension by Al Viro
10 *
11 */
12
13#include <linux/fs.h>
14#include <linux/pagemap.h>
15
16typedef __u16 __bitwise __fs16;
17typedef __u32 __bitwise __fs32;
18typedef __u64 __bitwise __fs64;
19
20#include <linux/qnx6_fs.h>
21
22#ifdef CONFIG_QNX6FS_DEBUG
23#define QNX6DEBUG(X) printk X
24#else
25#define QNX6DEBUG(X) (void) 0
26#endif
27
28struct qnx6_sb_info {
29 struct buffer_head *sb_buf; /* superblock buffer */
30 struct qnx6_super_block *sb; /* our superblock */
31 int s_blks_off; /* blkoffset fs-startpoint */
32 int s_ptrbits; /* indirect pointer bitfield */
33 unsigned long s_mount_opt; /* all mount options */
34 int s_bytesex; /* holds endianess info */
35 struct inode * inodes;
36 struct inode * longfile;
37};
38
39struct qnx6_inode_info {
40 __fs32 di_block_ptr[QNX6_NO_DIRECT_POINTERS];
41 __u8 di_filelevels;
42 __u32 i_dir_start_lookup;
43 struct inode vfs_inode;
44};
45
46extern struct inode *qnx6_iget(struct super_block *sb, unsigned ino);
47extern struct dentry *qnx6_lookup(struct inode *dir, struct dentry *dentry,
48 struct nameidata *nd);
49
50#ifdef CONFIG_QNX6FS_DEBUG
51extern void qnx6_superblock_debug(struct qnx6_super_block *,
52 struct super_block *);
53#endif
54
55extern const struct inode_operations qnx6_dir_inode_operations;
56extern const struct file_operations qnx6_dir_operations;
57
58static inline struct qnx6_sb_info *QNX6_SB(struct super_block *sb)
59{
60 return sb->s_fs_info;
61}
62
63static inline struct qnx6_inode_info *QNX6_I(struct inode *inode)
64{
65 return container_of(inode, struct qnx6_inode_info, vfs_inode);
66}
67
68#define clear_opt(o, opt) (o &= ~(QNX6_MOUNT_##opt))
69#define set_opt(o, opt) (o |= (QNX6_MOUNT_##opt))
70#define test_opt(sb, opt) (QNX6_SB(sb)->s_mount_opt & \
71 QNX6_MOUNT_##opt)
72enum {
73 BYTESEX_LE,
74 BYTESEX_BE,
75};
76
77static inline __u64 fs64_to_cpu(struct qnx6_sb_info *sbi, __fs64 n)
78{
79 if (sbi->s_bytesex == BYTESEX_LE)
80 return le64_to_cpu((__force __le64)n);
81 else
82 return be64_to_cpu((__force __be64)n);
83}
84
85static inline __fs64 cpu_to_fs64(struct qnx6_sb_info *sbi, __u64 n)
86{
87 if (sbi->s_bytesex == BYTESEX_LE)
88 return (__force __fs64)cpu_to_le64(n);
89 else
90 return (__force __fs64)cpu_to_be64(n);
91}
92
93static inline __u32 fs32_to_cpu(struct qnx6_sb_info *sbi, __fs32 n)
94{
95 if (sbi->s_bytesex == BYTESEX_LE)
96 return le32_to_cpu((__force __le32)n);
97 else
98 return be32_to_cpu((__force __be32)n);
99}
100
101static inline __fs32 cpu_to_fs32(struct qnx6_sb_info *sbi, __u32 n)
102{
103 if (sbi->s_bytesex == BYTESEX_LE)
104 return (__force __fs32)cpu_to_le32(n);
105 else
106 return (__force __fs32)cpu_to_be32(n);
107}
108
109static inline __u16 fs16_to_cpu(struct qnx6_sb_info *sbi, __fs16 n)
110{
111 if (sbi->s_bytesex == BYTESEX_LE)
112 return le16_to_cpu((__force __le16)n);
113 else
114 return be16_to_cpu((__force __be16)n);
115}
116
117static inline __fs16 cpu_to_fs16(struct qnx6_sb_info *sbi, __u16 n)
118{
119 if (sbi->s_bytesex == BYTESEX_LE)
120 return (__force __fs16)cpu_to_le16(n);
121 else
122 return (__force __fs16)cpu_to_be16(n);
123}
124
125extern struct qnx6_super_block *qnx6_mmi_fill_super(struct super_block *s,
126 int silent);
127
128static inline void qnx6_put_page(struct page *page)
129{
130 kunmap(page);
131 page_cache_release(page);
132}
133
134extern unsigned qnx6_find_entry(int len, struct inode *dir, const char *name,
135 struct page **res_page);
diff --git a/fs/qnx6/super_mmi.c b/fs/qnx6/super_mmi.c
new file mode 100644
index 000000000000..29c32cba62d6
--- /dev/null
+++ b/fs/qnx6/super_mmi.c
@@ -0,0 +1,150 @@
1/*
2 * QNX6 file system, Linux implementation.
3 *
4 * Version : 1.0.0
5 *
6 * History :
7 *
8 * 01-02-2012 by Kai Bankett (chaosman@ontika.net) : first release.
9 *
10 */
11
12#include <linux/buffer_head.h>
13#include <linux/slab.h>
14#include <linux/crc32.h>
15#include "qnx6.h"
16
17static void qnx6_mmi_copy_sb(struct qnx6_super_block *qsb,
18 struct qnx6_mmi_super_block *sb)
19{
20 qsb->sb_magic = sb->sb_magic;
21 qsb->sb_checksum = sb->sb_checksum;
22 qsb->sb_serial = sb->sb_serial;
23 qsb->sb_blocksize = sb->sb_blocksize;
24 qsb->sb_num_inodes = sb->sb_num_inodes;
25 qsb->sb_free_inodes = sb->sb_free_inodes;
26 qsb->sb_num_blocks = sb->sb_num_blocks;
27 qsb->sb_free_blocks = sb->sb_free_blocks;
28
29 /* the rest of the superblock is the same */
30 memcpy(&qsb->Inode, &sb->Inode, sizeof(sb->Inode));
31 memcpy(&qsb->Bitmap, &sb->Bitmap, sizeof(sb->Bitmap));
32 memcpy(&qsb->Longfile, &sb->Longfile, sizeof(sb->Longfile));
33}
34
35struct qnx6_super_block *qnx6_mmi_fill_super(struct super_block *s, int silent)
36{
37 struct buffer_head *bh1, *bh2 = NULL;
38 struct qnx6_mmi_super_block *sb1, *sb2;
39 struct qnx6_super_block *qsb = NULL;
40 struct qnx6_sb_info *sbi;
41 __u64 offset;
42
43 /* Check the superblock signatures
44 start with the first superblock */
45 bh1 = sb_bread(s, 0);
46 if (!bh1) {
47 printk(KERN_ERR "qnx6: Unable to read first mmi superblock\n");
48 return NULL;
49 }
50 sb1 = (struct qnx6_mmi_super_block *)bh1->b_data;
51 sbi = QNX6_SB(s);
52 if (fs32_to_cpu(sbi, sb1->sb_magic) != QNX6_SUPER_MAGIC) {
53 if (!silent) {
54 printk(KERN_ERR "qnx6: wrong signature (magic) in"
55 " superblock #1.\n");
56 goto out;
57 }
58 }
59
60 /* checksum check - start at byte 8 and end at byte 512 */
61 if (fs32_to_cpu(sbi, sb1->sb_checksum) !=
62 crc32_be(0, (char *)(bh1->b_data + 8), 504)) {
63 printk(KERN_ERR "qnx6: superblock #1 checksum error\n");
64 goto out;
65 }
66
67 /* calculate second superblock blocknumber */
68 offset = fs32_to_cpu(sbi, sb1->sb_num_blocks) + QNX6_SUPERBLOCK_AREA /
69 fs32_to_cpu(sbi, sb1->sb_blocksize);
70
71 /* set new blocksize */
72 if (!sb_set_blocksize(s, fs32_to_cpu(sbi, sb1->sb_blocksize))) {
73 printk(KERN_ERR "qnx6: unable to set blocksize\n");
74 goto out;
75 }
76 /* blocksize invalidates bh - pull it back in */
77 brelse(bh1);
78 bh1 = sb_bread(s, 0);
79 if (!bh1)
80 goto out;
81 sb1 = (struct qnx6_mmi_super_block *)bh1->b_data;
82
83 /* read second superblock */
84 bh2 = sb_bread(s, offset);
85 if (!bh2) {
86 printk(KERN_ERR "qnx6: unable to read the second superblock\n");
87 goto out;
88 }
89 sb2 = (struct qnx6_mmi_super_block *)bh2->b_data;
90 if (fs32_to_cpu(sbi, sb2->sb_magic) != QNX6_SUPER_MAGIC) {
91 if (!silent)
92 printk(KERN_ERR "qnx6: wrong signature (magic) in"
93 " superblock #2.\n");
94 goto out;
95 }
96
97 /* checksum check - start at byte 8 and end at byte 512 */
98 if (fs32_to_cpu(sbi, sb2->sb_checksum)
99 != crc32_be(0, (char *)(bh2->b_data + 8), 504)) {
100 printk(KERN_ERR "qnx6: superblock #1 checksum error\n");
101 goto out;
102 }
103
104 qsb = kmalloc(sizeof(*qsb), GFP_KERNEL);
105 if (!qsb) {
106 printk(KERN_ERR "qnx6: unable to allocate memory.\n");
107 goto out;
108 }
109
110 if (fs64_to_cpu(sbi, sb1->sb_serial) >
111 fs64_to_cpu(sbi, sb2->sb_serial)) {
112 /* superblock #1 active */
113 qnx6_mmi_copy_sb(qsb, sb1);
114#ifdef CONFIG_QNX6FS_DEBUG
115 qnx6_superblock_debug(qsb, s);
116#endif
117 memcpy(bh1->b_data, qsb, sizeof(struct qnx6_super_block));
118
119 sbi->sb_buf = bh1;
120 sbi->sb = (struct qnx6_super_block *)bh1->b_data;
121 brelse(bh2);
122 printk(KERN_INFO "qnx6: superblock #1 active\n");
123 } else {
124 /* superblock #2 active */
125 qnx6_mmi_copy_sb(qsb, sb2);
126#ifdef CONFIG_QNX6FS_DEBUG
127 qnx6_superblock_debug(qsb, s);
128#endif
129 memcpy(bh2->b_data, qsb, sizeof(struct qnx6_super_block));
130
131 sbi->sb_buf = bh2;
132 sbi->sb = (struct qnx6_super_block *)bh2->b_data;
133 brelse(bh1);
134 printk(KERN_INFO "qnx6: superblock #2 active\n");
135 }
136 kfree(qsb);
137
138 /* offset for mmi_fs is just SUPERBLOCK_AREA bytes */
139 sbi->s_blks_off = QNX6_SUPERBLOCK_AREA / s->s_blocksize;
140
141 /* success */
142 return sbi->sb;
143
144out:
145 if (bh1 != NULL)
146 brelse(bh1);
147 if (bh2 != NULL)
148 brelse(bh2);
149 return NULL;
150}
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-22 08:10:39 -0500