blob: 455ce5b77e9bf9eea279dccdf4a31a2a2154cd74 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Copyright (c) 2000-2001 Christoph Hellwig.
Krzysztof Błaszkowski1cce1702016-06-01 09:25:12 +02003 * Copyright (c) 2016 Krzysztof Blaszkowski
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 * 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>
David Howells726c3342006-06-23 02:02:58 -070044#include <linux/mount.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070045
46#include "vxfs.h"
47#include "vxfs_extern.h"
48#include "vxfs_dir.h"
49#include "vxfs_inode.h"
50
51
Krzysztof Błaszkowski1cce1702016-06-01 09:25:12 +020052MODULE_AUTHOR("Christoph Hellwig, Krzysztof Blaszkowski");
Linus Torvalds1da177e2005-04-16 15:20:36 -070053MODULE_DESCRIPTION("Veritas Filesystem (VxFS) driver");
54MODULE_LICENSE("Dual BSD/GPL");
55
Christoph Hellwig2f137e32016-06-01 08:44:45 +020056static struct kmem_cache *vxfs_inode_cachep;
57
Linus Torvalds1da177e2005-04-16 15:20:36 -070058/**
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
67static void
68vxfs_put_super(struct super_block *sbp)
69{
70 struct vxfs_sb_info *infp = VXFS_SBI(sbp);
71
Krzysztof Błaszkowski0e481d32016-06-01 08:41:11 +020072 iput(infp->vsi_fship);
73 iput(infp->vsi_ilist);
74 iput(infp->vsi_stilist);
Linus Torvalds1da177e2005-04-16 15:20:36 -070075
76 brelse(infp->vsi_bp);
77 kfree(infp);
78}
79
80/**
81 * vxfs_statfs - get filesystem information
David Howells726c3342006-06-23 02:02:58 -070082 * @dentry: VFS dentry to locate superblock
Linus Torvalds1da177e2005-04-16 15:20:36 -070083 * @bufp: output buffer
84 *
85 * Description:
86 * vxfs_statfs fills the statfs buffer @bufp with information
David Howells726c3342006-06-23 02:02:58 -070087 * about the filesystem described by @dentry.
Linus Torvalds1da177e2005-04-16 15:20:36 -070088 *
89 * Returns:
90 * Zero.
91 *
92 * Locking:
93 * No locks held.
94 *
95 * Notes:
96 * This is everything but complete...
97 */
98static int
David Howells726c3342006-06-23 02:02:58 -070099vxfs_statfs(struct dentry *dentry, struct kstatfs *bufp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100{
David Howells726c3342006-06-23 02:02:58 -0700101 struct vxfs_sb_info *infp = VXFS_SBI(dentry->d_sb);
Krzysztof Błaszkowski0d83f7f2016-05-31 08:45:13 +0200102 struct vxfs_sb *raw_sb = infp->vsi_raw;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103
104 bufp->f_type = VXFS_SUPER_MAGIC;
David Howells726c3342006-06-23 02:02:58 -0700105 bufp->f_bsize = dentry->d_sb->s_blocksize;
Krzysztof Błaszkowski0d83f7f2016-05-31 08:45:13 +0200106 bufp->f_blocks = fs32_to_cpu(infp, raw_sb->vs_dsize);
107 bufp->f_bfree = fs32_to_cpu(infp, raw_sb->vs_free);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108 bufp->f_bavail = 0;
109 bufp->f_files = 0;
Krzysztof Błaszkowski0d83f7f2016-05-31 08:45:13 +0200110 bufp->f_ffree = fs32_to_cpu(infp, raw_sb->vs_ifree);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111 bufp->f_namelen = VXFS_NAMELEN;
112
113 return 0;
114}
115
116static int vxfs_remount(struct super_block *sb, int *flags, char *data)
117{
Theodore Ts'o02b99842014-03-13 10:14:33 -0400118 sync_filesystem(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119 *flags |= MS_RDONLY;
120 return 0;
121}
122
Christoph Hellwig2f137e32016-06-01 08:44:45 +0200123static 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;
Krzysztof Błaszkowskif2fe2fa2016-06-12 19:26:04 +0200130 inode_init_once(&vi->vfs_inode);
Christoph Hellwig2f137e32016-06-01 08:44:45 +0200131 return &vi->vfs_inode;
132}
133
134static 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
141static void vxfs_destroy_inode(struct inode *inode)
142{
143 call_rcu(&inode->i_rcu, vxfs_i_callback);
144}
145
Christoph Hellwigf2bf2c72016-06-01 09:18:21 +0200146static const struct super_operations vxfs_super_ops = {
Christoph Hellwig2f137e32016-06-01 08:44:45 +0200147 .alloc_inode = vxfs_alloc_inode,
148 .destroy_inode = vxfs_destroy_inode,
Christoph Hellwigf2bf2c72016-06-01 09:18:21 +0200149 .evict_inode = vxfs_evict_inode,
150 .put_super = vxfs_put_super,
151 .statfs = vxfs_statfs,
152 .remount_fs = vxfs_remount,
153};
Krzysztof Błaszkowski0d83f7f2016-05-31 08:45:13 +0200154
155static 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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198/**
Uwe Kleine-König421f91d2010-06-11 12:17:00 +0200199 * vxfs_read_super - read superblock into memory and initialize filesystem
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200 * @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:
Jan Blunckdb719222010-08-15 22:51:10 +0200212 * We are under @sbp->s_lock.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213 */
214static int vxfs_fill_super(struct super_block *sbp, void *dp, int silent)
215{
216 struct vxfs_sb_info *infp;
217 struct vxfs_sb *rsbp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218 u_long bsize;
219 struct inode *root;
David Howellsd0b07942008-02-07 00:15:39 -0800220 int ret = -EINVAL;
Krzysztof Błaszkowski0d83f7f2016-05-31 08:45:13 +0200221 u32 j;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222
223 sbp->s_flags |= MS_RDONLY;
224
Pekka Enberge915fc42005-09-06 15:18:35 -0700225 infp = kzalloc(sizeof(*infp), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226 if (!infp) {
227 printk(KERN_WARNING "vxfs: unable to allocate incore superblock\n");
228 return -ENOMEM;
229 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230
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
Christoph Hellwig2f137e32016-06-01 08:44:45 +0200237 sbp->s_op = &vxfs_super_ops;
Krzysztof Błaszkowski0d83f7f2016-05-31 08:45:13 +0200238 sbp->s_fs_info = infp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239
Krzysztof Błaszkowski0d83f7f2016-05-31 08:45:13 +0200240 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 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249 if (!silent)
Krzysztof Błaszkowski0d83f7f2016-05-31 08:45:13 +0200250 printk(KERN_NOTICE "vxfs: can't find superblock.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251 goto out;
252 }
253
Krzysztof Błaszkowski0d83f7f2016-05-31 08:45:13 +0200254 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258 goto out;
259 }
260
261#ifdef DIAGNOSTIC
Krzysztof Błaszkowski0d83f7f2016-05-31 08:45:13 +0200262 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));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265#endif
266
Krzysztof Błaszkowski0d83f7f2016-05-31 08:45:13 +0200267 sbp->s_magic = fs32_to_cpu(infp, rsbp->vs_magic);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268
Krzysztof Błaszkowski0d83f7f2016-05-31 08:45:13 +0200269 infp->vsi_oltext = fs32_to_cpu(infp, rsbp->vs_oltext[0]);
270 infp->vsi_oltsize = fs32_to_cpu(infp, rsbp->vs_oltsize);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271
Krzysztof Błaszkowski0d83f7f2016-05-31 08:45:13 +0200272 j = fs32_to_cpu(infp, rsbp->vs_bsize);
273 if (!sb_set_blocksize(sbp, j)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274 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
David Howellsd0b07942008-02-07 00:15:39 -0800288 root = vxfs_iget(sbp, VXFS_ROOT_INO);
289 if (IS_ERR(root)) {
290 ret = PTR_ERR(root);
291 goto out;
292 }
Al Viro48fde702012-01-08 22:15:13 -0500293 sbp->s_root = d_make_root(root);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294 if (!sbp->s_root) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295 printk(KERN_WARNING "vxfs: unable to get root dentry.\n");
296 goto out_free_ilist;
297 }
298
299 return 0;
300
301out_free_ilist:
Krzysztof Błaszkowski0e481d32016-06-01 08:41:11 +0200302 iput(infp->vsi_fship);
303 iput(infp->vsi_ilist);
304 iput(infp->vsi_stilist);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305out:
Krzysztof Błaszkowski0d83f7f2016-05-31 08:45:13 +0200306 brelse(infp->vsi_bp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307 kfree(infp);
David Howellsd0b07942008-02-07 00:15:39 -0800308 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309}
310
311/*
312 * The usual module blurb.
313 */
Al Viro152a0832010-07-25 00:46:55 +0400314static struct dentry *vxfs_mount(struct file_system_type *fs_type,
315 int flags, const char *dev_name, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316{
Al Viro152a0832010-07-25 00:46:55 +0400317 return mount_bdev(fs_type, flags, dev_name, data, vxfs_fill_super);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318}
319
320static struct file_system_type vxfs_fs_type = {
321 .owner = THIS_MODULE,
322 .name = "vxfs",
Al Viro152a0832010-07-25 00:46:55 +0400323 .mount = vxfs_mount,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324 .kill_sb = kill_block_super,
325 .fs_flags = FS_REQUIRES_DEV,
326};
Eric W. Biederman7f78e032013-03-02 19:39:14 -0800327MODULE_ALIAS_FS("vxfs"); /* makes mount -t vxfs autoload the module */
Eric W. Biedermanfa7614dd2013-03-12 18:27:41 -0700328MODULE_ALIAS("vxfs");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329
330static int __init
331vxfs_init(void)
332{
Alexey Dobriyana4376e12006-09-29 02:01:04 -0700333 int rv;
334
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335 vxfs_inode_cachep = kmem_cache_create("vxfs_inode",
Paul Mundt20c2df82007-07-20 10:11:58 +0900336 sizeof(struct vxfs_inode_info), 0,
337 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD, NULL);
Alexey Dobriyana4376e12006-09-29 02:01:04 -0700338 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344}
345
346static void __exit
347vxfs_cleanup(void)
348{
349 unregister_filesystem(&vxfs_fs_type);
Kirill A. Shutemov8c0a8532012-09-26 11:33:07 +1000350 /*
351 * Make sure all delayed rcu free inodes are flushed before we
352 * destroy cache.
353 */
354 rcu_barrier();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355 kmem_cache_destroy(vxfs_inode_cachep);
356}
357
358module_init(vxfs_init);
359module_exit(vxfs_cleanup);