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1da177e4 LT |
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> | |
726c3342 | 43 | #include <linux/mount.h> |
1da177e4 LT |
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 | ||
1da177e4 LT |
55 | |
56 | ||
57 | static void vxfs_put_super(struct super_block *); | |
726c3342 | 58 | static int vxfs_statfs(struct dentry *, struct kstatfs *); |
1da177e4 LT |
59 | static int vxfs_remount(struct super_block *, int *, char *); |
60 | ||
ee9b6d61 | 61 | static const struct super_operations vxfs_super_ops = { |
b57922d9 | 62 | .evict_inode = vxfs_evict_inode, |
1da177e4 LT |
63 | .put_super = vxfs_put_super, |
64 | .statfs = vxfs_statfs, | |
65 | .remount_fs = vxfs_remount, | |
66 | }; | |
67 | ||
68 | /** | |
69 | * vxfs_put_super - free superblock resources | |
70 | * @sbp: VFS superblock. | |
71 | * | |
72 | * Description: | |
73 | * vxfs_put_super frees all resources allocated for @sbp | |
74 | * after the last instance of the filesystem is unmounted. | |
75 | */ | |
76 | ||
77 | static void | |
78 | vxfs_put_super(struct super_block *sbp) | |
79 | { | |
80 | struct vxfs_sb_info *infp = VXFS_SBI(sbp); | |
81 | ||
82 | vxfs_put_fake_inode(infp->vsi_fship); | |
83 | vxfs_put_fake_inode(infp->vsi_ilist); | |
84 | vxfs_put_fake_inode(infp->vsi_stilist); | |
85 | ||
86 | brelse(infp->vsi_bp); | |
87 | kfree(infp); | |
88 | } | |
89 | ||
90 | /** | |
91 | * vxfs_statfs - get filesystem information | |
726c3342 | 92 | * @dentry: VFS dentry to locate superblock |
1da177e4 LT |
93 | * @bufp: output buffer |
94 | * | |
95 | * Description: | |
96 | * vxfs_statfs fills the statfs buffer @bufp with information | |
726c3342 | 97 | * about the filesystem described by @dentry. |
1da177e4 LT |
98 | * |
99 | * Returns: | |
100 | * Zero. | |
101 | * | |
102 | * Locking: | |
103 | * No locks held. | |
104 | * | |
105 | * Notes: | |
106 | * This is everything but complete... | |
107 | */ | |
108 | static int | |
726c3342 | 109 | vxfs_statfs(struct dentry *dentry, struct kstatfs *bufp) |
1da177e4 | 110 | { |
726c3342 | 111 | struct vxfs_sb_info *infp = VXFS_SBI(dentry->d_sb); |
1da177e4 LT |
112 | |
113 | bufp->f_type = VXFS_SUPER_MAGIC; | |
726c3342 | 114 | bufp->f_bsize = dentry->d_sb->s_blocksize; |
1da177e4 LT |
115 | bufp->f_blocks = infp->vsi_raw->vs_dsize; |
116 | bufp->f_bfree = infp->vsi_raw->vs_free; | |
117 | bufp->f_bavail = 0; | |
118 | bufp->f_files = 0; | |
119 | bufp->f_ffree = infp->vsi_raw->vs_ifree; | |
120 | bufp->f_namelen = VXFS_NAMELEN; | |
121 | ||
122 | return 0; | |
123 | } | |
124 | ||
125 | static int vxfs_remount(struct super_block *sb, int *flags, char *data) | |
126 | { | |
02b9984d | 127 | sync_filesystem(sb); |
1da177e4 LT |
128 | *flags |= MS_RDONLY; |
129 | return 0; | |
130 | } | |
131 | ||
132 | /** | |
421f91d2 | 133 | * vxfs_read_super - read superblock into memory and initialize filesystem |
1da177e4 LT |
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: | |
db719222 | 146 | * We are under @sbp->s_lock. |
1da177e4 LT |
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; | |
d0b07948 | 155 | int ret = -EINVAL; |
1da177e4 LT |
156 | |
157 | sbp->s_flags |= MS_RDONLY; | |
158 | ||
e915fc49 | 159 | infp = kzalloc(sizeof(*infp), GFP_KERNEL); |
1da177e4 LT |
160 | if (!infp) { |
161 | printk(KERN_WARNING "vxfs: unable to allocate incore superblock\n"); | |
162 | return -ENOMEM; | |
163 | } | |
1da177e4 LT |
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; | |
8cb681b9 | 199 | sbp->s_fs_info = infp; |
1da177e4 LT |
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; | |
d0b07948 DH |
222 | root = vxfs_iget(sbp, VXFS_ROOT_INO); |
223 | if (IS_ERR(root)) { | |
224 | ret = PTR_ERR(root); | |
225 | goto out; | |
226 | } | |
48fde701 | 227 | sbp->s_root = d_make_root(root); |
1da177e4 | 228 | if (!sbp->s_root) { |
1da177e4 LT |
229 | printk(KERN_WARNING "vxfs: unable to get root dentry.\n"); |
230 | goto out_free_ilist; | |
231 | } | |
232 | ||
233 | return 0; | |
234 | ||
235 | out_free_ilist: | |
236 | vxfs_put_fake_inode(infp->vsi_fship); | |
237 | vxfs_put_fake_inode(infp->vsi_ilist); | |
238 | vxfs_put_fake_inode(infp->vsi_stilist); | |
239 | out: | |
240 | brelse(bp); | |
241 | kfree(infp); | |
d0b07948 | 242 | return ret; |
1da177e4 LT |
243 | } |
244 | ||
245 | /* | |
246 | * The usual module blurb. | |
247 | */ | |
152a0836 AV |
248 | static struct dentry *vxfs_mount(struct file_system_type *fs_type, |
249 | int flags, const char *dev_name, void *data) | |
1da177e4 | 250 | { |
152a0836 | 251 | return mount_bdev(fs_type, flags, dev_name, data, vxfs_fill_super); |
1da177e4 LT |
252 | } |
253 | ||
254 | static struct file_system_type vxfs_fs_type = { | |
255 | .owner = THIS_MODULE, | |
256 | .name = "vxfs", | |
152a0836 | 257 | .mount = vxfs_mount, |
1da177e4 LT |
258 | .kill_sb = kill_block_super, |
259 | .fs_flags = FS_REQUIRES_DEV, | |
260 | }; | |
7f78e035 | 261 | MODULE_ALIAS_FS("vxfs"); /* makes mount -t vxfs autoload the module */ |
fa7614dd | 262 | MODULE_ALIAS("vxfs"); |
1da177e4 LT |
263 | |
264 | static int __init | |
265 | vxfs_init(void) | |
266 | { | |
a4376e13 AD |
267 | int rv; |
268 | ||
1da177e4 | 269 | vxfs_inode_cachep = kmem_cache_create("vxfs_inode", |
20c2df83 PM |
270 | sizeof(struct vxfs_inode_info), 0, |
271 | SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD, NULL); | |
a4376e13 AD |
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; | |
1da177e4 LT |
278 | } |
279 | ||
280 | static void __exit | |
281 | vxfs_cleanup(void) | |
282 | { | |
283 | unregister_filesystem(&vxfs_fs_type); | |
8c0a8537 KS |
284 | /* |
285 | * Make sure all delayed rcu free inodes are flushed before we | |
286 | * destroy cache. | |
287 | */ | |
288 | rcu_barrier(); | |
1da177e4 LT |
289 | kmem_cache_destroy(vxfs_inode_cachep); |
290 | } | |
291 | ||
292 | module_init(vxfs_init); | |
293 | module_exit(vxfs_cleanup); |