1 /*
2 * Copyright (c) 2000-2001 Christoph Hellwig.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions, and the following disclaimer,
10 * without modification.
11 * 2. The name of the author may not be used to endorse or promote products
12 * derived from this software without specific prior written permission.
13 *
14 * Alternatively, this software may be distributed under the terms of the
15 * GNU General Public License ("GPL").
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
21 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30 /*
31 * Veritas filesystem driver - superblock related routines.
32 */
33 #include <linux/init.h>
34 #include <linux/module.h>
35
36 #include <linux/blkdev.h>
37 #include <linux/fs.h>
38 #include <linux/buffer_head.h>
39 #include <linux/kernel.h>
40 #include <linux/slab.h>
41 #include <linux/stat.h>
42 #include <linux/vfs.h>
43 #include <linux/mount.h>
44
45 #include "vxfs.h"
46 #include "vxfs_extern.h"
47 #include "vxfs_dir.h"
48 #include "vxfs_inode.h"
49
50
51 MODULE_AUTHOR("Christoph Hellwig");
52 MODULE_DESCRIPTION("Veritas Filesystem (VxFS) driver");
53 MODULE_LICENSE("Dual BSD/GPL");
54
55 MODULE_ALIAS("vxfs"); /* makes mount -t vxfs autoload the module */
56
57
58 static void vxfs_put_super(struct super_block *);
59 static int vxfs_statfs(struct dentry *, struct kstatfs *);
60 static int vxfs_remount(struct super_block *, int *, char *);
61
62 static const struct super_operations vxfs_super_ops = {
63 .clear_inode = vxfs_clear_inode,
64 .put_super = vxfs_put_super,
65 .statfs = vxfs_statfs,
66 .remount_fs = vxfs_remount,
67 };
68
69 /**
70 * vxfs_put_super - free superblock resources
71 * @sbp: VFS superblock.
72 *
73 * Description:
74 * vxfs_put_super frees all resources allocated for @sbp
75 * after the last instance of the filesystem is unmounted.
76 */
77
78 static void
79 vxfs_put_super(struct super_block *sbp)
80 {
81 struct vxfs_sb_info *infp = VXFS_SBI(sbp);
82
83 vxfs_put_fake_inode(infp->vsi_fship);
84 vxfs_put_fake_inode(infp->vsi_ilist);
85 vxfs_put_fake_inode(infp->vsi_stilist);
86
87 brelse(infp->vsi_bp);
88 kfree(infp);
89 }
90
91 /**
92 * vxfs_statfs - get filesystem information
93 * @dentry: VFS dentry to locate superblock
94 * @bufp: output buffer
95 *
96 * Description:
97 * vxfs_statfs fills the statfs buffer @bufp with information
98 * about the filesystem described by @dentry.
99 *
100 * Returns:
101 * Zero.
102 *
103 * Locking:
104 * No locks held.
105 *
106 * Notes:
107 * This is everything but complete...
108 */
109 static int
110 vxfs_statfs(struct dentry *dentry, struct kstatfs *bufp)
111 {
112 struct vxfs_sb_info *infp = VXFS_SBI(dentry->d_sb);
113
114 bufp->f_type = VXFS_SUPER_MAGIC;
115 bufp->f_bsize = dentry->d_sb->s_blocksize;
116 bufp->f_blocks = infp->vsi_raw->vs_dsize;
117 bufp->f_bfree = infp->vsi_raw->vs_free;
118 bufp->f_bavail = 0;
119 bufp->f_files = 0;
120 bufp->f_ffree = infp->vsi_raw->vs_ifree;
121 bufp->f_namelen = VXFS_NAMELEN;
122
123 return 0;
124 }
125
126 static int vxfs_remount(struct super_block *sb, int *flags, char *data)
127 {
128 *flags |= MS_RDONLY;
129 return 0;
130 }
131
132 /**
133 * vxfs_read_super - read superblock into memory and initalize filesystem
134 * @sbp: VFS superblock (to fill)
135 * @dp: fs private mount data
136 * @silent: do not complain loudly when sth is wrong
137 *
138 * Description:
139 * We are called on the first mount of a filesystem to read the
140 * superblock into memory and do some basic setup.
141 *
142 * Returns:
143 * The superblock on success, else %NULL.
144 *
145 * Locking:
146 * We are under the bkl and @sbp->s_lock.
147 */
148 static int vxfs_fill_super(struct super_block *sbp, void *dp, int silent)
149 {
150 struct vxfs_sb_info *infp;
151 struct vxfs_sb *rsbp;
152 struct buffer_head *bp = NULL;
153 u_long bsize;
154 struct inode *root;
155 int ret = -EINVAL;
156
157 sbp->s_flags |= MS_RDONLY;
158
159 infp = kzalloc(sizeof(*infp), GFP_KERNEL);
160 if (!infp) {
161 printk(KERN_WARNING "vxfs: unable to allocate incore superblock\n");
162 return -ENOMEM;
163 }
164
165 bsize = sb_min_blocksize(sbp, BLOCK_SIZE);
166 if (!bsize) {
167 printk(KERN_WARNING "vxfs: unable to set blocksize\n");
168 goto out;
169 }
170
171 bp = sb_bread(sbp, 1);
172 if (!bp || !buffer_mapped(bp)) {
173 if (!silent) {
174 printk(KERN_WARNING
175 "vxfs: unable to read disk superblock\n");
176 }
177 goto out;
178 }
179
180 rsbp = (struct vxfs_sb *)bp->b_data;
181 if (rsbp->vs_magic != VXFS_SUPER_MAGIC) {
182 if (!silent)
183 printk(KERN_NOTICE "vxfs: WRONG superblock magic\n");
184 goto out;
185 }
186
187 if ((rsbp->vs_version < 2 || rsbp->vs_version > 4) && !silent) {
188 printk(KERN_NOTICE "vxfs: unsupported VxFS version (%d)\n",
189 rsbp->vs_version);
190 goto out;
191 }
192
193 #ifdef DIAGNOSTIC
194 printk(KERN_DEBUG "vxfs: supported VxFS version (%d)\n", rsbp->vs_version);
195 printk(KERN_DEBUG "vxfs: blocksize: %d\n", rsbp->vs_bsize);
196 #endif
197
198 sbp->s_magic = rsbp->vs_magic;
199 sbp->s_fs_info = infp;
200
201 infp->vsi_raw = rsbp;
202 infp->vsi_bp = bp;
203 infp->vsi_oltext = rsbp->vs_oltext[0];
204 infp->vsi_oltsize = rsbp->vs_oltsize;
205
206 if (!sb_set_blocksize(sbp, rsbp->vs_bsize)) {
207 printk(KERN_WARNING "vxfs: unable to set final block size\n");
208 goto out;
209 }
210
211 if (vxfs_read_olt(sbp, bsize)) {
212 printk(KERN_WARNING "vxfs: unable to read olt\n");
213 goto out;
214 }
215
216 if (vxfs_read_fshead(sbp)) {
217 printk(KERN_WARNING "vxfs: unable to read fshead\n");
218 goto out;
219 }
220
221 sbp->s_op = &vxfs_super_ops;
222 root = vxfs_iget(sbp, VXFS_ROOT_INO);
223 if (IS_ERR(root)) {
224 ret = PTR_ERR(root);
225 goto out;
226 }
227 sbp->s_root = d_alloc_root(root);
228 if (!sbp->s_root) {
229 iput(root);
230 printk(KERN_WARNING "vxfs: unable to get root dentry.\n");
231 goto out_free_ilist;
232 }
233
234 return 0;
235
236 out_free_ilist:
237 vxfs_put_fake_inode(infp->vsi_fship);
238 vxfs_put_fake_inode(infp->vsi_ilist);
239 vxfs_put_fake_inode(infp->vsi_stilist);
240 out:
241 brelse(bp);
242 kfree(infp);
243 return ret;
244 }
245
246 /*
247 * The usual module blurb.
248 */
249 static int vxfs_get_sb(struct file_system_type *fs_type,
250 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
251 {
252 return get_sb_bdev(fs_type, flags, dev_name, data, vxfs_fill_super,
253 mnt);
254 }
255
256 static struct file_system_type vxfs_fs_type = {
257 .owner = THIS_MODULE,
258 .name = "vxfs",
259 .get_sb = vxfs_get_sb,
260 .kill_sb = kill_block_super,
261 .fs_flags = FS_REQUIRES_DEV,
262 };
263
264 static int __init
265 vxfs_init(void)
266 {
267 int rv;
268
269 vxfs_inode_cachep = kmem_cache_create("vxfs_inode",
270 sizeof(struct vxfs_inode_info), 0,
271 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD, NULL);
272 if (!vxfs_inode_cachep)
273 return -ENOMEM;
274 rv = register_filesystem(&vxfs_fs_type);
275 if (rv < 0)
276 kmem_cache_destroy(vxfs_inode_cachep);
277 return rv;
278 }
279
280 static void __exit
281 vxfs_cleanup(void)
282 {
283 unregister_filesystem(&vxfs_fs_type);
284 kmem_cache_destroy(vxfs_inode_cachep);
285 }
286
287 module_init(vxfs_init);
288 module_exit(vxfs_cleanup);
289
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