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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_free_inode(struct inode *inode)
135{
136 kmem_cache_free(vxfs_inode_cachep, VXFS_INO(inode));
137}
138
139static const struct super_operations vxfs_super_ops = {
140 .alloc_inode = vxfs_alloc_inode,
141 .free_inode = vxfs_free_inode,
142 .evict_inode = vxfs_evict_inode,
143 .put_super = vxfs_put_super,
144 .statfs = vxfs_statfs,
145 .remount_fs = vxfs_remount,
146};
147
148static int vxfs_try_sb_magic(struct super_block *sbp, int silent,
149 unsigned blk, __fs32 magic)
150{
151 struct buffer_head *bp;
152 struct vxfs_sb *rsbp;
153 struct vxfs_sb_info *infp = VXFS_SBI(sbp);
154 int rc = -ENOMEM;
155
156 bp = sb_bread(sbp, blk);
157 do {
158 if (!bp || !buffer_mapped(bp)) {
159 if (!silent) {
160 printk(KERN_WARNING
161 "vxfs: unable to read disk superblock at %u\n",
162 blk);
163 }
164 break;
165 }
166
167 rc = -EINVAL;
168 rsbp = (struct vxfs_sb *)bp->b_data;
169 if (rsbp->vs_magic != magic) {
170 if (!silent)
171 printk(KERN_NOTICE
172 "vxfs: WRONG superblock magic %08x at %u\n",
173 rsbp->vs_magic, blk);
174 break;
175 }
176
177 rc = 0;
178 infp->vsi_raw = rsbp;
179 infp->vsi_bp = bp;
180 } while (0);
181
182 if (rc) {
183 infp->vsi_raw = NULL;
184 infp->vsi_bp = NULL;
185 brelse(bp);
186 }
187
188 return rc;
189}
190
191/**
192 * vxfs_read_super - read superblock into memory and initialize filesystem
193 * @sbp: VFS superblock (to fill)
194 * @dp: fs private mount data
195 * @silent: do not complain loudly when sth is wrong
196 *
197 * Description:
198 * We are called on the first mount of a filesystem to read the
199 * superblock into memory and do some basic setup.
200 *
201 * Returns:
202 * The superblock on success, else %NULL.
203 *
204 * Locking:
205 * We are under @sbp->s_lock.
206 */
207static int vxfs_fill_super(struct super_block *sbp, void *dp, int silent)
208{
209 struct vxfs_sb_info *infp;
210 struct vxfs_sb *rsbp;
211 u_long bsize;
212 struct inode *root;
213 int ret = -EINVAL;
214 u32 j;
215
216 sbp->s_flags |= SB_RDONLY;
217
218 infp = kzalloc(sizeof(*infp), GFP_KERNEL);
219 if (!infp) {
220 printk(KERN_WARNING "vxfs: unable to allocate incore superblock\n");
221 return -ENOMEM;
222 }
223
224 bsize = sb_min_blocksize(sbp, BLOCK_SIZE);
225 if (!bsize) {
226 printk(KERN_WARNING "vxfs: unable to set blocksize\n");
227 goto out;
228 }
229
230 sbp->s_op = &vxfs_super_ops;
231 sbp->s_fs_info = infp;
232 sbp->s_time_min = 0;
233 sbp->s_time_max = U32_MAX;
234
235 if (!vxfs_try_sb_magic(sbp, silent, 1,
236 (__force __fs32)cpu_to_le32(VXFS_SUPER_MAGIC))) {
237 /* Unixware, x86 */
238 infp->byte_order = VXFS_BO_LE;
239 } else if (!vxfs_try_sb_magic(sbp, silent, 8,
240 (__force __fs32)cpu_to_be32(VXFS_SUPER_MAGIC))) {
241 /* HP-UX, parisc */
242 infp->byte_order = VXFS_BO_BE;
243 } else {
244 if (!silent)
245 printk(KERN_NOTICE "vxfs: can't find superblock.\n");
246 goto out;
247 }
248
249 rsbp = infp->vsi_raw;
250 j = fs32_to_cpu(infp, rsbp->vs_version);
251 if ((j < 2 || j > 4) && !silent) {
252 printk(KERN_NOTICE "vxfs: unsupported VxFS version (%d)\n", j);
253 goto out;
254 }
255
256#ifdef DIAGNOSTIC
257 printk(KERN_DEBUG "vxfs: supported VxFS version (%d)\n", j);
258 printk(KERN_DEBUG "vxfs: blocksize: %d\n",
259 fs32_to_cpu(infp, rsbp->vs_bsize));
260#endif
261
262 sbp->s_magic = fs32_to_cpu(infp, rsbp->vs_magic);
263
264 infp->vsi_oltext = fs32_to_cpu(infp, rsbp->vs_oltext[0]);
265 infp->vsi_oltsize = fs32_to_cpu(infp, rsbp->vs_oltsize);
266
267 j = fs32_to_cpu(infp, rsbp->vs_bsize);
268 if (!sb_set_blocksize(sbp, j)) {
269 printk(KERN_WARNING "vxfs: unable to set final block size\n");
270 goto out;
271 }
272
273 if (vxfs_read_olt(sbp, bsize)) {
274 printk(KERN_WARNING "vxfs: unable to read olt\n");
275 goto out;
276 }
277
278 if (vxfs_read_fshead(sbp)) {
279 printk(KERN_WARNING "vxfs: unable to read fshead\n");
280 goto out;
281 }
282
283 root = vxfs_iget(sbp, VXFS_ROOT_INO);
284 if (IS_ERR(root)) {
285 ret = PTR_ERR(root);
286 goto out;
287 }
288 sbp->s_root = d_make_root(root);
289 if (!sbp->s_root) {
290 printk(KERN_WARNING "vxfs: unable to get root dentry.\n");
291 goto out_free_ilist;
292 }
293
294 return 0;
295
296out_free_ilist:
297 iput(infp->vsi_fship);
298 iput(infp->vsi_ilist);
299 iput(infp->vsi_stilist);
300out:
301 brelse(infp->vsi_bp);
302 kfree(infp);
303 return ret;
304}
305
306/*
307 * The usual module blurb.
308 */
309static struct dentry *vxfs_mount(struct file_system_type *fs_type,
310 int flags, const char *dev_name, void *data)
311{
312 return mount_bdev(fs_type, flags, dev_name, data, vxfs_fill_super);
313}
314
315static struct file_system_type vxfs_fs_type = {
316 .owner = THIS_MODULE,
317 .name = "vxfs",
318 .mount = vxfs_mount,
319 .kill_sb = kill_block_super,
320 .fs_flags = FS_REQUIRES_DEV,
321};
322MODULE_ALIAS_FS("vxfs"); /* makes mount -t vxfs autoload the module */
323MODULE_ALIAS("vxfs");
324
325static int __init
326vxfs_init(void)
327{
328 int rv;
329
330 vxfs_inode_cachep = kmem_cache_create_usercopy("vxfs_inode",
331 sizeof(struct vxfs_inode_info), 0,
332 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
333 offsetof(struct vxfs_inode_info, vii_immed.vi_immed),
334 sizeof_field(struct vxfs_inode_info,
335 vii_immed.vi_immed),
336 NULL);
337 if (!vxfs_inode_cachep)
338 return -ENOMEM;
339 rv = register_filesystem(&vxfs_fs_type);
340 if (rv < 0)
341 kmem_cache_destroy(vxfs_inode_cachep);
342 return rv;
343}
344
345static void __exit
346vxfs_cleanup(void)
347{
348 unregister_filesystem(&vxfs_fs_type);
349 /*
350 * Make sure all delayed rcu free inodes are flushed before we
351 * destroy cache.
352 */
353 rcu_barrier();
354 kmem_cache_destroy(vxfs_inode_cachep);
355}
356
357module_init(vxfs_init);
358module_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/fs_context.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_reconfigure(struct fs_context *fc)
95{
96 sync_filesystem(fc->root->d_sb);
97 fc->sb_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};
124
125static int vxfs_try_sb_magic(struct super_block *sbp, struct fs_context *fc,
126 unsigned blk, __fs32 magic)
127{
128 struct buffer_head *bp;
129 struct vxfs_sb *rsbp;
130 struct vxfs_sb_info *infp = VXFS_SBI(sbp);
131 int silent = fc->sb_flags & SB_SILENT;
132 int rc = -ENOMEM;
133
134 bp = sb_bread(sbp, blk);
135 do {
136 if (!bp || !buffer_mapped(bp)) {
137 if (!silent) {
138 warnf(fc,
139 "vxfs: unable to read disk superblock at %u",
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 infof(fc,
150 "vxfs: WRONG superblock magic %08x at %u",
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 * @fc: filesytem context
173 *
174 * Description:
175 * We are called on the first mount of a filesystem to read the
176 * superblock into memory and do some basic setup.
177 *
178 * Returns:
179 * The superblock on success, else %NULL.
180 *
181 * Locking:
182 * We are under @sbp->s_lock.
183 */
184static int vxfs_fill_super(struct super_block *sbp, struct fs_context *fc)
185{
186 struct vxfs_sb_info *infp;
187 struct vxfs_sb *rsbp;
188 u_long bsize;
189 struct inode *root;
190 int ret = -EINVAL;
191 int silent = fc->sb_flags & SB_SILENT;
192 u32 j;
193
194 sbp->s_flags |= SB_RDONLY;
195
196 infp = kzalloc(sizeof(*infp), GFP_KERNEL);
197 if (!infp) {
198 warnf(fc, "vxfs: unable to allocate incore superblock");
199 return -ENOMEM;
200 }
201
202 bsize = sb_min_blocksize(sbp, BLOCK_SIZE);
203 if (!bsize) {
204 warnf(fc, "vxfs: unable to set blocksize");
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, fc, 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, fc, 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 infof(fc, "vxfs: can't find superblock.");
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 infof(fc, "vxfs: unsupported VxFS version (%d)", 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 warnf(fc, "vxfs: unable to set final block size");
248 goto out;
249 }
250
251 if (vxfs_read_olt(sbp, bsize)) {
252 warnf(fc, "vxfs: unable to read olt");
253 goto out;
254 }
255
256 if (vxfs_read_fshead(sbp)) {
257 warnf(fc, "vxfs: unable to read fshead");
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 warnf(fc, "vxfs: unable to get root dentry.");
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 int vxfs_get_tree(struct fs_context *fc)
288{
289 return get_tree_bdev(fc, vxfs_fill_super);
290}
291
292static const struct fs_context_operations vxfs_context_ops = {
293 .get_tree = vxfs_get_tree,
294 .reconfigure = vxfs_reconfigure,
295};
296
297static int vxfs_init_fs_context(struct fs_context *fc)
298{
299 fc->ops = &vxfs_context_ops;
300
301 return 0;
302}
303
304static struct file_system_type vxfs_fs_type = {
305 .owner = THIS_MODULE,
306 .name = "vxfs",
307 .kill_sb = kill_block_super,
308 .fs_flags = FS_REQUIRES_DEV,
309 .init_fs_context = vxfs_init_fs_context,
310};
311MODULE_ALIAS_FS("vxfs"); /* makes mount -t vxfs autoload the module */
312MODULE_ALIAS("vxfs");
313
314static int __init
315vxfs_init(void)
316{
317 int rv;
318
319 vxfs_inode_cachep = kmem_cache_create_usercopy("vxfs_inode",
320 sizeof(struct vxfs_inode_info), 0,
321 SLAB_RECLAIM_ACCOUNT,
322 offsetof(struct vxfs_inode_info, vii_immed.vi_immed),
323 sizeof_field(struct vxfs_inode_info,
324 vii_immed.vi_immed),
325 NULL);
326 if (!vxfs_inode_cachep)
327 return -ENOMEM;
328 rv = register_filesystem(&vxfs_fs_type);
329 if (rv < 0)
330 kmem_cache_destroy(vxfs_inode_cachep);
331 return rv;
332}
333
334static void __exit
335vxfs_cleanup(void)
336{
337 unregister_filesystem(&vxfs_fs_type);
338 /*
339 * Make sure all delayed rcu free inodes are flushed before we
340 * destroy cache.
341 */
342 rcu_barrier();
343 kmem_cache_destroy(vxfs_inode_cachep);
344}
345
346module_init(vxfs_init);
347module_exit(vxfs_cleanup);