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1da177e4 LT |
1 | /* |
2 | * Copyright (c) 2000-2001 Christoph Hellwig. | |
1cce1701 | 3 | * Copyright (c) 2016 Krzysztof Blaszkowski |
1da177e4 LT |
4 | * All rights reserved. |
5 | * | |
6 | * Redistribution and use in source and binary forms, with or without | |
7 | * modification, are permitted provided that the following conditions | |
8 | * are met: | |
9 | * 1. Redistributions of source code must retain the above copyright | |
10 | * notice, this list of conditions, and the following disclaimer, | |
11 | * without modification. | |
12 | * 2. The name of the author may not be used to endorse or promote products | |
13 | * derived from this software without specific prior written permission. | |
14 | * | |
15 | * Alternatively, this software may be distributed under the terms of the | |
16 | * GNU General Public License ("GPL"). | |
17 | * | |
18 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND | |
19 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
20 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
21 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR | |
22 | * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
23 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
24 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
25 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
26 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
27 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
28 | * SUCH DAMAGE. | |
29 | */ | |
30 | ||
31 | /* | |
32 | * Veritas filesystem driver - superblock related routines. | |
33 | */ | |
34 | #include <linux/init.h> | |
35 | #include <linux/module.h> | |
36 | ||
37 | #include <linux/blkdev.h> | |
38 | #include <linux/fs.h> | |
39 | #include <linux/buffer_head.h> | |
40 | #include <linux/kernel.h> | |
41 | #include <linux/slab.h> | |
42 | #include <linux/stat.h> | |
43 | #include <linux/vfs.h> | |
726c3342 | 44 | #include <linux/mount.h> |
1da177e4 LT |
45 | |
46 | #include "vxfs.h" | |
47 | #include "vxfs_extern.h" | |
48 | #include "vxfs_dir.h" | |
49 | #include "vxfs_inode.h" | |
50 | ||
51 | ||
1cce1701 | 52 | MODULE_AUTHOR("Christoph Hellwig, Krzysztof Blaszkowski"); |
1da177e4 LT |
53 | MODULE_DESCRIPTION("Veritas Filesystem (VxFS) driver"); |
54 | MODULE_LICENSE("Dual BSD/GPL"); | |
55 | ||
2f137e31 CH |
56 | static struct kmem_cache *vxfs_inode_cachep; |
57 | ||
1da177e4 LT |
58 | /** |
59 | * vxfs_put_super - free superblock resources | |
60 | * @sbp: VFS superblock. | |
61 | * | |
62 | * Description: | |
63 | * vxfs_put_super frees all resources allocated for @sbp | |
64 | * after the last instance of the filesystem is unmounted. | |
65 | */ | |
66 | ||
67 | static void | |
68 | vxfs_put_super(struct super_block *sbp) | |
69 | { | |
70 | struct vxfs_sb_info *infp = VXFS_SBI(sbp); | |
71 | ||
0e481d3c KB |
72 | iput(infp->vsi_fship); |
73 | iput(infp->vsi_ilist); | |
74 | iput(infp->vsi_stilist); | |
1da177e4 LT |
75 | |
76 | brelse(infp->vsi_bp); | |
77 | kfree(infp); | |
78 | } | |
79 | ||
80 | /** | |
81 | * vxfs_statfs - get filesystem information | |
726c3342 | 82 | * @dentry: VFS dentry to locate superblock |
1da177e4 LT |
83 | * @bufp: output buffer |
84 | * | |
85 | * Description: | |
86 | * vxfs_statfs fills the statfs buffer @bufp with information | |
726c3342 | 87 | * about the filesystem described by @dentry. |
1da177e4 LT |
88 | * |
89 | * Returns: | |
90 | * Zero. | |
91 | * | |
92 | * Locking: | |
93 | * No locks held. | |
94 | * | |
95 | * Notes: | |
96 | * This is everything but complete... | |
97 | */ | |
98 | static int | |
726c3342 | 99 | vxfs_statfs(struct dentry *dentry, struct kstatfs *bufp) |
1da177e4 | 100 | { |
726c3342 | 101 | struct vxfs_sb_info *infp = VXFS_SBI(dentry->d_sb); |
0d83f7fc | 102 | struct vxfs_sb *raw_sb = infp->vsi_raw; |
1da177e4 LT |
103 | |
104 | bufp->f_type = VXFS_SUPER_MAGIC; | |
726c3342 | 105 | bufp->f_bsize = dentry->d_sb->s_blocksize; |
0d83f7fc KB |
106 | bufp->f_blocks = fs32_to_cpu(infp, raw_sb->vs_dsize); |
107 | bufp->f_bfree = fs32_to_cpu(infp, raw_sb->vs_free); | |
1da177e4 LT |
108 | bufp->f_bavail = 0; |
109 | bufp->f_files = 0; | |
0d83f7fc | 110 | bufp->f_ffree = fs32_to_cpu(infp, raw_sb->vs_ifree); |
1da177e4 LT |
111 | bufp->f_namelen = VXFS_NAMELEN; |
112 | ||
113 | return 0; | |
114 | } | |
115 | ||
116 | static int vxfs_remount(struct super_block *sb, int *flags, char *data) | |
117 | { | |
02b9984d | 118 | sync_filesystem(sb); |
1751e8a6 | 119 | *flags |= SB_RDONLY; |
1da177e4 LT |
120 | return 0; |
121 | } | |
122 | ||
2f137e31 CH |
123 | static struct inode *vxfs_alloc_inode(struct super_block *sb) |
124 | { | |
125 | struct vxfs_inode_info *vi; | |
126 | ||
127 | vi = kmem_cache_alloc(vxfs_inode_cachep, GFP_KERNEL); | |
128 | if (!vi) | |
129 | return NULL; | |
f2fe2fa1 | 130 | inode_init_once(&vi->vfs_inode); |
2f137e31 CH |
131 | return &vi->vfs_inode; |
132 | } | |
133 | ||
134 | static void vxfs_i_callback(struct rcu_head *head) | |
135 | { | |
136 | struct inode *inode = container_of(head, struct inode, i_rcu); | |
137 | ||
138 | kmem_cache_free(vxfs_inode_cachep, VXFS_INO(inode)); | |
139 | } | |
140 | ||
141 | static void vxfs_destroy_inode(struct inode *inode) | |
142 | { | |
143 | call_rcu(&inode->i_rcu, vxfs_i_callback); | |
144 | } | |
145 | ||
f2bf2c70 | 146 | static const struct super_operations vxfs_super_ops = { |
2f137e31 CH |
147 | .alloc_inode = vxfs_alloc_inode, |
148 | .destroy_inode = vxfs_destroy_inode, | |
f2bf2c70 CH |
149 | .evict_inode = vxfs_evict_inode, |
150 | .put_super = vxfs_put_super, | |
151 | .statfs = vxfs_statfs, | |
152 | .remount_fs = vxfs_remount, | |
153 | }; | |
0d83f7fc KB |
154 | |
155 | static int vxfs_try_sb_magic(struct super_block *sbp, int silent, | |
156 | unsigned blk, __fs32 magic) | |
157 | { | |
158 | struct buffer_head *bp; | |
159 | struct vxfs_sb *rsbp; | |
160 | struct vxfs_sb_info *infp = VXFS_SBI(sbp); | |
161 | int rc = -ENOMEM; | |
162 | ||
163 | bp = sb_bread(sbp, blk); | |
164 | do { | |
165 | if (!bp || !buffer_mapped(bp)) { | |
166 | if (!silent) { | |
167 | printk(KERN_WARNING | |
168 | "vxfs: unable to read disk superblock at %u\n", | |
169 | blk); | |
170 | } | |
171 | break; | |
172 | } | |
173 | ||
174 | rc = -EINVAL; | |
175 | rsbp = (struct vxfs_sb *)bp->b_data; | |
176 | if (rsbp->vs_magic != magic) { | |
177 | if (!silent) | |
178 | printk(KERN_NOTICE | |
179 | "vxfs: WRONG superblock magic %08x at %u\n", | |
180 | rsbp->vs_magic, blk); | |
181 | break; | |
182 | } | |
183 | ||
184 | rc = 0; | |
185 | infp->vsi_raw = rsbp; | |
186 | infp->vsi_bp = bp; | |
187 | } while (0); | |
188 | ||
189 | if (rc) { | |
190 | infp->vsi_raw = NULL; | |
191 | infp->vsi_bp = NULL; | |
192 | brelse(bp); | |
193 | } | |
194 | ||
195 | return rc; | |
196 | } | |
197 | ||
1da177e4 | 198 | /** |
421f91d2 | 199 | * vxfs_read_super - read superblock into memory and initialize filesystem |
1da177e4 LT |
200 | * @sbp: VFS superblock (to fill) |
201 | * @dp: fs private mount data | |
202 | * @silent: do not complain loudly when sth is wrong | |
203 | * | |
204 | * Description: | |
205 | * We are called on the first mount of a filesystem to read the | |
206 | * superblock into memory and do some basic setup. | |
207 | * | |
208 | * Returns: | |
209 | * The superblock on success, else %NULL. | |
210 | * | |
211 | * Locking: | |
db719222 | 212 | * We are under @sbp->s_lock. |
1da177e4 LT |
213 | */ |
214 | static int vxfs_fill_super(struct super_block *sbp, void *dp, int silent) | |
215 | { | |
216 | struct vxfs_sb_info *infp; | |
217 | struct vxfs_sb *rsbp; | |
1da177e4 LT |
218 | u_long bsize; |
219 | struct inode *root; | |
d0b07948 | 220 | int ret = -EINVAL; |
0d83f7fc | 221 | u32 j; |
1da177e4 | 222 | |
1751e8a6 | 223 | sbp->s_flags |= SB_RDONLY; |
1da177e4 | 224 | |
e915fc49 | 225 | infp = kzalloc(sizeof(*infp), GFP_KERNEL); |
1da177e4 LT |
226 | if (!infp) { |
227 | printk(KERN_WARNING "vxfs: unable to allocate incore superblock\n"); | |
228 | return -ENOMEM; | |
229 | } | |
1da177e4 LT |
230 | |
231 | bsize = sb_min_blocksize(sbp, BLOCK_SIZE); | |
232 | if (!bsize) { | |
233 | printk(KERN_WARNING "vxfs: unable to set blocksize\n"); | |
234 | goto out; | |
235 | } | |
236 | ||
2f137e31 | 237 | sbp->s_op = &vxfs_super_ops; |
0d83f7fc | 238 | sbp->s_fs_info = infp; |
1da177e4 | 239 | |
0d83f7fc KB |
240 | if (!vxfs_try_sb_magic(sbp, silent, 1, |
241 | (__force __fs32)cpu_to_le32(VXFS_SUPER_MAGIC))) { | |
242 | /* Unixware, x86 */ | |
243 | infp->byte_order = VXFS_BO_LE; | |
244 | } else if (!vxfs_try_sb_magic(sbp, silent, 8, | |
245 | (__force __fs32)cpu_to_be32(VXFS_SUPER_MAGIC))) { | |
246 | /* HP-UX, parisc */ | |
247 | infp->byte_order = VXFS_BO_BE; | |
248 | } else { | |
1da177e4 | 249 | if (!silent) |
0d83f7fc | 250 | printk(KERN_NOTICE "vxfs: can't find superblock.\n"); |
1da177e4 LT |
251 | goto out; |
252 | } | |
253 | ||
0d83f7fc KB |
254 | rsbp = infp->vsi_raw; |
255 | j = fs32_to_cpu(infp, rsbp->vs_version); | |
256 | if ((j < 2 || j > 4) && !silent) { | |
257 | printk(KERN_NOTICE "vxfs: unsupported VxFS version (%d)\n", j); | |
1da177e4 LT |
258 | goto out; |
259 | } | |
260 | ||
261 | #ifdef DIAGNOSTIC | |
0d83f7fc KB |
262 | printk(KERN_DEBUG "vxfs: supported VxFS version (%d)\n", j); |
263 | printk(KERN_DEBUG "vxfs: blocksize: %d\n", | |
264 | fs32_to_cpu(infp, rsbp->vs_bsize)); | |
1da177e4 LT |
265 | #endif |
266 | ||
0d83f7fc | 267 | sbp->s_magic = fs32_to_cpu(infp, rsbp->vs_magic); |
1da177e4 | 268 | |
0d83f7fc KB |
269 | infp->vsi_oltext = fs32_to_cpu(infp, rsbp->vs_oltext[0]); |
270 | infp->vsi_oltsize = fs32_to_cpu(infp, rsbp->vs_oltsize); | |
1da177e4 | 271 | |
0d83f7fc KB |
272 | j = fs32_to_cpu(infp, rsbp->vs_bsize); |
273 | if (!sb_set_blocksize(sbp, j)) { | |
1da177e4 LT |
274 | printk(KERN_WARNING "vxfs: unable to set final block size\n"); |
275 | goto out; | |
276 | } | |
277 | ||
278 | if (vxfs_read_olt(sbp, bsize)) { | |
279 | printk(KERN_WARNING "vxfs: unable to read olt\n"); | |
280 | goto out; | |
281 | } | |
282 | ||
283 | if (vxfs_read_fshead(sbp)) { | |
284 | printk(KERN_WARNING "vxfs: unable to read fshead\n"); | |
285 | goto out; | |
286 | } | |
287 | ||
d0b07948 DH |
288 | root = vxfs_iget(sbp, VXFS_ROOT_INO); |
289 | if (IS_ERR(root)) { | |
290 | ret = PTR_ERR(root); | |
291 | goto out; | |
292 | } | |
48fde701 | 293 | sbp->s_root = d_make_root(root); |
1da177e4 | 294 | if (!sbp->s_root) { |
1da177e4 LT |
295 | printk(KERN_WARNING "vxfs: unable to get root dentry.\n"); |
296 | goto out_free_ilist; | |
297 | } | |
298 | ||
299 | return 0; | |
300 | ||
301 | out_free_ilist: | |
0e481d3c KB |
302 | iput(infp->vsi_fship); |
303 | iput(infp->vsi_ilist); | |
304 | iput(infp->vsi_stilist); | |
1da177e4 | 305 | out: |
0d83f7fc | 306 | brelse(infp->vsi_bp); |
1da177e4 | 307 | kfree(infp); |
d0b07948 | 308 | return ret; |
1da177e4 LT |
309 | } |
310 | ||
311 | /* | |
312 | * The usual module blurb. | |
313 | */ | |
152a0836 AV |
314 | static struct dentry *vxfs_mount(struct file_system_type *fs_type, |
315 | int flags, const char *dev_name, void *data) | |
1da177e4 | 316 | { |
152a0836 | 317 | return mount_bdev(fs_type, flags, dev_name, data, vxfs_fill_super); |
1da177e4 LT |
318 | } |
319 | ||
320 | static struct file_system_type vxfs_fs_type = { | |
321 | .owner = THIS_MODULE, | |
322 | .name = "vxfs", | |
152a0836 | 323 | .mount = vxfs_mount, |
1da177e4 LT |
324 | .kill_sb = kill_block_super, |
325 | .fs_flags = FS_REQUIRES_DEV, | |
326 | }; | |
7f78e035 | 327 | MODULE_ALIAS_FS("vxfs"); /* makes mount -t vxfs autoload the module */ |
fa7614dd | 328 | MODULE_ALIAS("vxfs"); |
1da177e4 LT |
329 | |
330 | static int __init | |
331 | vxfs_init(void) | |
332 | { | |
a4376e13 AD |
333 | int rv; |
334 | ||
1da177e4 | 335 | vxfs_inode_cachep = kmem_cache_create("vxfs_inode", |
20c2df83 PM |
336 | sizeof(struct vxfs_inode_info), 0, |
337 | SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD, NULL); | |
a4376e13 AD |
338 | if (!vxfs_inode_cachep) |
339 | return -ENOMEM; | |
340 | rv = register_filesystem(&vxfs_fs_type); | |
341 | if (rv < 0) | |
342 | kmem_cache_destroy(vxfs_inode_cachep); | |
343 | return rv; | |
1da177e4 LT |
344 | } |
345 | ||
346 | static void __exit | |
347 | vxfs_cleanup(void) | |
348 | { | |
349 | unregister_filesystem(&vxfs_fs_type); | |
8c0a8537 KS |
350 | /* |
351 | * Make sure all delayed rcu free inodes are flushed before we | |
352 | * destroy cache. | |
353 | */ | |
354 | rcu_barrier(); | |
1da177e4 LT |
355 | kmem_cache_destroy(vxfs_inode_cachep); |
356 | } | |
357 | ||
358 | module_init(vxfs_init); | |
359 | module_exit(vxfs_cleanup); |