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1/*
2 * Copyright (c) 2000-2001 Christoph Hellwig.
3 * Copyright (c) 2016 Krzysztof Blaszkowski
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>
44#include <linux/mount.h>
45
46#include "vxfs.h"
47#include "vxfs_extern.h"
48#include "vxfs_dir.h"
49#include "vxfs_inode.h"
50
51
52MODULE_AUTHOR("Christoph Hellwig, Krzysztof Blaszkowski");
53MODULE_DESCRIPTION("Veritas Filesystem (VxFS) driver");
54MODULE_LICENSE("Dual BSD/GPL");
55
56static struct kmem_cache *vxfs_inode_cachep;
57
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
67static void
68vxfs_put_super(struct super_block *sbp)
69{
70 struct vxfs_sb_info *infp = VXFS_SBI(sbp);
71
72 iput(infp->vsi_fship);
73 iput(infp->vsi_ilist);
74 iput(infp->vsi_stilist);
75
76 brelse(infp->vsi_bp);
77 kfree(infp);
78}
79
80/**
81 * vxfs_statfs - get filesystem information
82 * @dentry: VFS dentry to locate superblock
83 * @bufp: output buffer
84 *
85 * Description:
86 * vxfs_statfs fills the statfs buffer @bufp with information
87 * about the filesystem described by @dentry.
88 *
89 * Returns:
90 * Zero.
91 *
92 * Locking:
93 * No locks held.
94 *
95 * Notes:
96 * This is everything but complete...
97 */
98static int
99vxfs_statfs(struct dentry *dentry, struct kstatfs *bufp)
100{
101 struct vxfs_sb_info *infp = VXFS_SBI(dentry->d_sb);
102 struct vxfs_sb *raw_sb = infp->vsi_raw;
103
104 bufp->f_type = VXFS_SUPER_MAGIC;
105 bufp->f_bsize = dentry->d_sb->s_blocksize;
106 bufp->f_blocks = fs32_to_cpu(infp, raw_sb->vs_dsize);
107 bufp->f_bfree = fs32_to_cpu(infp, raw_sb->vs_free);
108 bufp->f_bavail = 0;
109 bufp->f_files = 0;
110 bufp->f_ffree = fs32_to_cpu(infp, raw_sb->vs_ifree);
111 bufp->f_namelen = VXFS_NAMELEN;
112
113 return 0;
114}
115
116static int vxfs_remount(struct super_block *sb, int *flags, char *data)
117{
118 sync_filesystem(sb);
119 *flags |= SB_RDONLY;
120 return 0;
121}
122
123static 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;
130 inode_init_once(&vi->vfs_inode);
131 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
146static const struct super_operations vxfs_super_ops = {
147 .alloc_inode = vxfs_alloc_inode,
148 .destroy_inode = vxfs_destroy_inode,
149 .evict_inode = vxfs_evict_inode,
150 .put_super = vxfs_put_super,
151 .statfs = vxfs_statfs,
152 .remount_fs = vxfs_remount,
153};
154
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
198/**
199 * vxfs_read_super - read superblock into memory and initialize filesystem
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:
212 * We are under @sbp->s_lock.
213 */
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;
218 u_long bsize;
219 struct inode *root;
220 int ret = -EINVAL;
221 u32 j;
222
223 sbp->s_flags |= SB_RDONLY;
224
225 infp = kzalloc(sizeof(*infp), GFP_KERNEL);
226 if (!infp) {
227 printk(KERN_WARNING "vxfs: unable to allocate incore superblock\n");
228 return -ENOMEM;
229 }
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
237 sbp->s_op = &vxfs_super_ops;
238 sbp->s_fs_info = infp;
239
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 {
249 if (!silent)
250 printk(KERN_NOTICE "vxfs: can't find superblock.\n");
251 goto out;
252 }
253
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);
258 goto out;
259 }
260
261#ifdef DIAGNOSTIC
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));
265#endif
266
267 sbp->s_magic = fs32_to_cpu(infp, rsbp->vs_magic);
268
269 infp->vsi_oltext = fs32_to_cpu(infp, rsbp->vs_oltext[0]);
270 infp->vsi_oltsize = fs32_to_cpu(infp, rsbp->vs_oltsize);
271
272 j = fs32_to_cpu(infp, rsbp->vs_bsize);
273 if (!sb_set_blocksize(sbp, j)) {
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
288 root = vxfs_iget(sbp, VXFS_ROOT_INO);
289 if (IS_ERR(root)) {
290 ret = PTR_ERR(root);
291 goto out;
292 }
293 sbp->s_root = d_make_root(root);
294 if (!sbp->s_root) {
295 printk(KERN_WARNING "vxfs: unable to get root dentry.\n");
296 goto out_free_ilist;
297 }
298
299 return 0;
300
301out_free_ilist:
302 iput(infp->vsi_fship);
303 iput(infp->vsi_ilist);
304 iput(infp->vsi_stilist);
305out:
306 brelse(infp->vsi_bp);
307 kfree(infp);
308 return ret;
309}
310
311/*
312 * The usual module blurb.
313 */
314static struct dentry *vxfs_mount(struct file_system_type *fs_type,
315 int flags, const char *dev_name, void *data)
316{
317 return mount_bdev(fs_type, flags, dev_name, data, vxfs_fill_super);
318}
319
320static struct file_system_type vxfs_fs_type = {
321 .owner = THIS_MODULE,
322 .name = "vxfs",
323 .mount = vxfs_mount,
324 .kill_sb = kill_block_super,
325 .fs_flags = FS_REQUIRES_DEV,
326};
327MODULE_ALIAS_FS("vxfs"); /* makes mount -t vxfs autoload the module */
328MODULE_ALIAS("vxfs");
329
330static int __init
331vxfs_init(void)
332{
333 int rv;
334
335 vxfs_inode_cachep = kmem_cache_create_usercopy("vxfs_inode",
336 sizeof(struct vxfs_inode_info), 0,
337 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
338 offsetof(struct vxfs_inode_info, vii_immed.vi_immed),
339 sizeof_field(struct vxfs_inode_info,
340 vii_immed.vi_immed),
341 NULL);
342 if (!vxfs_inode_cachep)
343 return -ENOMEM;
344 rv = register_filesystem(&vxfs_fs_type);
345 if (rv < 0)
346 kmem_cache_destroy(vxfs_inode_cachep);
347 return rv;
348}
349
350static void __exit
351vxfs_cleanup(void)
352{
353 unregister_filesystem(&vxfs_fs_type);
354 /*
355 * Make sure all delayed rcu free inodes are flushed before we
356 * destroy cache.
357 */
358 rcu_barrier();
359 kmem_cache_destroy(vxfs_inode_cachep);
360}
361
362module_init(vxfs_init);
363module_exit(vxfs_cleanup);
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (c) 2000-2001 Christoph Hellwig.
4 * Copyright (c) 2016 Krzysztof Blaszkowski
5 */
6
7/*
8 * Veritas filesystem driver - superblock related routines.
9 */
10#include <linux/init.h>
11#include <linux/module.h>
12
13#include <linux/blkdev.h>
14#include <linux/fs.h>
15#include <linux/buffer_head.h>
16#include <linux/kernel.h>
17#include <linux/slab.h>
18#include <linux/stat.h>
19#include <linux/vfs.h>
20#include <linux/mount.h>
21
22#include "vxfs.h"
23#include "vxfs_extern.h"
24#include "vxfs_dir.h"
25#include "vxfs_inode.h"
26
27
28MODULE_AUTHOR("Christoph Hellwig, Krzysztof Blaszkowski");
29MODULE_DESCRIPTION("Veritas Filesystem (VxFS) driver");
30MODULE_LICENSE("Dual BSD/GPL");
31
32static struct kmem_cache *vxfs_inode_cachep;
33
34/**
35 * vxfs_put_super - free superblock resources
36 * @sbp: VFS superblock.
37 *
38 * Description:
39 * vxfs_put_super frees all resources allocated for @sbp
40 * after the last instance of the filesystem is unmounted.
41 */
42
43static void
44vxfs_put_super(struct super_block *sbp)
45{
46 struct vxfs_sb_info *infp = VXFS_SBI(sbp);
47
48 iput(infp->vsi_fship);
49 iput(infp->vsi_ilist);
50 iput(infp->vsi_stilist);
51
52 brelse(infp->vsi_bp);
53 kfree(infp);
54}
55
56/**
57 * vxfs_statfs - get filesystem information
58 * @dentry: VFS dentry to locate superblock
59 * @bufp: output buffer
60 *
61 * Description:
62 * vxfs_statfs fills the statfs buffer @bufp with information
63 * about the filesystem described by @dentry.
64 *
65 * Returns:
66 * Zero.
67 *
68 * Locking:
69 * No locks held.
70 *
71 * Notes:
72 * This is everything but complete...
73 */
74static int
75vxfs_statfs(struct dentry *dentry, struct kstatfs *bufp)
76{
77 struct vxfs_sb_info *infp = VXFS_SBI(dentry->d_sb);
78 struct vxfs_sb *raw_sb = infp->vsi_raw;
79 u64 id = huge_encode_dev(dentry->d_sb->s_bdev->bd_dev);
80
81 bufp->f_type = VXFS_SUPER_MAGIC;
82 bufp->f_bsize = dentry->d_sb->s_blocksize;
83 bufp->f_blocks = fs32_to_cpu(infp, raw_sb->vs_dsize);
84 bufp->f_bfree = fs32_to_cpu(infp, raw_sb->vs_free);
85 bufp->f_bavail = 0;
86 bufp->f_files = 0;
87 bufp->f_ffree = fs32_to_cpu(infp, raw_sb->vs_ifree);
88 bufp->f_fsid = u64_to_fsid(id);
89 bufp->f_namelen = VXFS_NAMELEN;
90
91 return 0;
92}
93
94static int vxfs_remount(struct super_block *sb, int *flags, char *data)
95{
96 sync_filesystem(sb);
97 *flags |= SB_RDONLY;
98 return 0;
99}
100
101static struct inode *vxfs_alloc_inode(struct super_block *sb)
102{
103 struct vxfs_inode_info *vi;
104
105 vi = alloc_inode_sb(sb, vxfs_inode_cachep, GFP_KERNEL);
106 if (!vi)
107 return NULL;
108 inode_init_once(&vi->vfs_inode);
109 return &vi->vfs_inode;
110}
111
112static void vxfs_free_inode(struct inode *inode)
113{
114 kmem_cache_free(vxfs_inode_cachep, VXFS_INO(inode));
115}
116
117static const struct super_operations vxfs_super_ops = {
118 .alloc_inode = vxfs_alloc_inode,
119 .free_inode = vxfs_free_inode,
120 .evict_inode = vxfs_evict_inode,
121 .put_super = vxfs_put_super,
122 .statfs = vxfs_statfs,
123 .remount_fs = vxfs_remount,
124};
125
126static int vxfs_try_sb_magic(struct super_block *sbp, int silent,
127 unsigned blk, __fs32 magic)
128{
129 struct buffer_head *bp;
130 struct vxfs_sb *rsbp;
131 struct vxfs_sb_info *infp = VXFS_SBI(sbp);
132 int rc = -ENOMEM;
133
134 bp = sb_bread(sbp, blk);
135 do {
136 if (!bp || !buffer_mapped(bp)) {
137 if (!silent) {
138 printk(KERN_WARNING
139 "vxfs: unable to read disk superblock at %u\n",
140 blk);
141 }
142 break;
143 }
144
145 rc = -EINVAL;
146 rsbp = (struct vxfs_sb *)bp->b_data;
147 if (rsbp->vs_magic != magic) {
148 if (!silent)
149 printk(KERN_NOTICE
150 "vxfs: WRONG superblock magic %08x at %u\n",
151 rsbp->vs_magic, blk);
152 break;
153 }
154
155 rc = 0;
156 infp->vsi_raw = rsbp;
157 infp->vsi_bp = bp;
158 } while (0);
159
160 if (rc) {
161 infp->vsi_raw = NULL;
162 infp->vsi_bp = NULL;
163 brelse(bp);
164 }
165
166 return rc;
167}
168
169/**
170 * vxfs_fill_super - read superblock into memory and initialize filesystem
171 * @sbp: VFS superblock (to fill)
172 * @dp: fs private mount data
173 * @silent: do not complain loudly when sth is wrong
174 *
175 * Description:
176 * We are called on the first mount of a filesystem to read the
177 * superblock into memory and do some basic setup.
178 *
179 * Returns:
180 * The superblock on success, else %NULL.
181 *
182 * Locking:
183 * We are under @sbp->s_lock.
184 */
185static int vxfs_fill_super(struct super_block *sbp, void *dp, int silent)
186{
187 struct vxfs_sb_info *infp;
188 struct vxfs_sb *rsbp;
189 u_long bsize;
190 struct inode *root;
191 int ret = -EINVAL;
192 u32 j;
193
194 sbp->s_flags |= SB_RDONLY;
195
196 infp = kzalloc(sizeof(*infp), GFP_KERNEL);
197 if (!infp) {
198 printk(KERN_WARNING "vxfs: unable to allocate incore superblock\n");
199 return -ENOMEM;
200 }
201
202 bsize = sb_min_blocksize(sbp, BLOCK_SIZE);
203 if (!bsize) {
204 printk(KERN_WARNING "vxfs: unable to set blocksize\n");
205 goto out;
206 }
207
208 sbp->s_op = &vxfs_super_ops;
209 sbp->s_fs_info = infp;
210 sbp->s_time_min = 0;
211 sbp->s_time_max = U32_MAX;
212
213 if (!vxfs_try_sb_magic(sbp, silent, 1,
214 (__force __fs32)cpu_to_le32(VXFS_SUPER_MAGIC))) {
215 /* Unixware, x86 */
216 infp->byte_order = VXFS_BO_LE;
217 } else if (!vxfs_try_sb_magic(sbp, silent, 8,
218 (__force __fs32)cpu_to_be32(VXFS_SUPER_MAGIC))) {
219 /* HP-UX, parisc */
220 infp->byte_order = VXFS_BO_BE;
221 } else {
222 if (!silent)
223 printk(KERN_NOTICE "vxfs: can't find superblock.\n");
224 goto out;
225 }
226
227 rsbp = infp->vsi_raw;
228 j = fs32_to_cpu(infp, rsbp->vs_version);
229 if ((j < 2 || j > 4) && !silent) {
230 printk(KERN_NOTICE "vxfs: unsupported VxFS version (%d)\n", j);
231 goto out;
232 }
233
234#ifdef DIAGNOSTIC
235 printk(KERN_DEBUG "vxfs: supported VxFS version (%d)\n", j);
236 printk(KERN_DEBUG "vxfs: blocksize: %d\n",
237 fs32_to_cpu(infp, rsbp->vs_bsize));
238#endif
239
240 sbp->s_magic = fs32_to_cpu(infp, rsbp->vs_magic);
241
242 infp->vsi_oltext = fs32_to_cpu(infp, rsbp->vs_oltext[0]);
243 infp->vsi_oltsize = fs32_to_cpu(infp, rsbp->vs_oltsize);
244
245 j = fs32_to_cpu(infp, rsbp->vs_bsize);
246 if (!sb_set_blocksize(sbp, j)) {
247 printk(KERN_WARNING "vxfs: unable to set final block size\n");
248 goto out;
249 }
250
251 if (vxfs_read_olt(sbp, bsize)) {
252 printk(KERN_WARNING "vxfs: unable to read olt\n");
253 goto out;
254 }
255
256 if (vxfs_read_fshead(sbp)) {
257 printk(KERN_WARNING "vxfs: unable to read fshead\n");
258 goto out;
259 }
260
261 root = vxfs_iget(sbp, VXFS_ROOT_INO);
262 if (IS_ERR(root)) {
263 ret = PTR_ERR(root);
264 goto out;
265 }
266 sbp->s_root = d_make_root(root);
267 if (!sbp->s_root) {
268 printk(KERN_WARNING "vxfs: unable to get root dentry.\n");
269 goto out_free_ilist;
270 }
271
272 return 0;
273
274out_free_ilist:
275 iput(infp->vsi_fship);
276 iput(infp->vsi_ilist);
277 iput(infp->vsi_stilist);
278out:
279 brelse(infp->vsi_bp);
280 kfree(infp);
281 return ret;
282}
283
284/*
285 * The usual module blurb.
286 */
287static struct dentry *vxfs_mount(struct file_system_type *fs_type,
288 int flags, const char *dev_name, void *data)
289{
290 return mount_bdev(fs_type, flags, dev_name, data, vxfs_fill_super);
291}
292
293static struct file_system_type vxfs_fs_type = {
294 .owner = THIS_MODULE,
295 .name = "vxfs",
296 .mount = vxfs_mount,
297 .kill_sb = kill_block_super,
298 .fs_flags = FS_REQUIRES_DEV,
299};
300MODULE_ALIAS_FS("vxfs"); /* makes mount -t vxfs autoload the module */
301MODULE_ALIAS("vxfs");
302
303static int __init
304vxfs_init(void)
305{
306 int rv;
307
308 vxfs_inode_cachep = kmem_cache_create_usercopy("vxfs_inode",
309 sizeof(struct vxfs_inode_info), 0,
310 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
311 offsetof(struct vxfs_inode_info, vii_immed.vi_immed),
312 sizeof_field(struct vxfs_inode_info,
313 vii_immed.vi_immed),
314 NULL);
315 if (!vxfs_inode_cachep)
316 return -ENOMEM;
317 rv = register_filesystem(&vxfs_fs_type);
318 if (rv < 0)
319 kmem_cache_destroy(vxfs_inode_cachep);
320 return rv;
321}
322
323static void __exit
324vxfs_cleanup(void)
325{
326 unregister_filesystem(&vxfs_fs_type);
327 /*
328 * Make sure all delayed rcu free inodes are flushed before we
329 * destroy cache.
330 */
331 rcu_barrier();
332 kmem_cache_destroy(vxfs_inode_cachep);
333}
334
335module_init(vxfs_init);
336module_exit(vxfs_cleanup);