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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 | ||
55 | MODULE_ALIAS("vxfs"); /* makes mount -t vxfs autoload the module */ | |
56 | ||
57 | ||
58 | static void vxfs_put_super(struct super_block *); | |
726c3342 | 59 | static int vxfs_statfs(struct dentry *, struct kstatfs *); |
1da177e4 LT |
60 | static int vxfs_remount(struct super_block *, int *, char *); |
61 | ||
ee9b6d61 | 62 | static const struct super_operations vxfs_super_ops = { |
1da177e4 LT |
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 | ||
6cfd0148 CH |
83 | lock_kernel(); |
84 | ||
1da177e4 LT |
85 | vxfs_put_fake_inode(infp->vsi_fship); |
86 | vxfs_put_fake_inode(infp->vsi_ilist); | |
87 | vxfs_put_fake_inode(infp->vsi_stilist); | |
88 | ||
89 | brelse(infp->vsi_bp); | |
90 | kfree(infp); | |
6cfd0148 CH |
91 | |
92 | unlock_kernel(); | |
1da177e4 LT |
93 | } |
94 | ||
95 | /** | |
96 | * vxfs_statfs - get filesystem information | |
726c3342 | 97 | * @dentry: VFS dentry to locate superblock |
1da177e4 LT |
98 | * @bufp: output buffer |
99 | * | |
100 | * Description: | |
101 | * vxfs_statfs fills the statfs buffer @bufp with information | |
726c3342 | 102 | * about the filesystem described by @dentry. |
1da177e4 LT |
103 | * |
104 | * Returns: | |
105 | * Zero. | |
106 | * | |
107 | * Locking: | |
108 | * No locks held. | |
109 | * | |
110 | * Notes: | |
111 | * This is everything but complete... | |
112 | */ | |
113 | static int | |
726c3342 | 114 | vxfs_statfs(struct dentry *dentry, struct kstatfs *bufp) |
1da177e4 | 115 | { |
726c3342 | 116 | struct vxfs_sb_info *infp = VXFS_SBI(dentry->d_sb); |
1da177e4 LT |
117 | |
118 | bufp->f_type = VXFS_SUPER_MAGIC; | |
726c3342 | 119 | bufp->f_bsize = dentry->d_sb->s_blocksize; |
1da177e4 LT |
120 | bufp->f_blocks = infp->vsi_raw->vs_dsize; |
121 | bufp->f_bfree = infp->vsi_raw->vs_free; | |
122 | bufp->f_bavail = 0; | |
123 | bufp->f_files = 0; | |
124 | bufp->f_ffree = infp->vsi_raw->vs_ifree; | |
125 | bufp->f_namelen = VXFS_NAMELEN; | |
126 | ||
127 | return 0; | |
128 | } | |
129 | ||
130 | static int vxfs_remount(struct super_block *sb, int *flags, char *data) | |
131 | { | |
132 | *flags |= MS_RDONLY; | |
133 | return 0; | |
134 | } | |
135 | ||
136 | /** | |
137 | * vxfs_read_super - read superblock into memory and initalize filesystem | |
138 | * @sbp: VFS superblock (to fill) | |
139 | * @dp: fs private mount data | |
140 | * @silent: do not complain loudly when sth is wrong | |
141 | * | |
142 | * Description: | |
143 | * We are called on the first mount of a filesystem to read the | |
144 | * superblock into memory and do some basic setup. | |
145 | * | |
146 | * Returns: | |
147 | * The superblock on success, else %NULL. | |
148 | * | |
149 | * Locking: | |
150 | * We are under the bkl and @sbp->s_lock. | |
151 | */ | |
152 | static int vxfs_fill_super(struct super_block *sbp, void *dp, int silent) | |
153 | { | |
154 | struct vxfs_sb_info *infp; | |
155 | struct vxfs_sb *rsbp; | |
156 | struct buffer_head *bp = NULL; | |
157 | u_long bsize; | |
158 | struct inode *root; | |
d0b07948 | 159 | int ret = -EINVAL; |
1da177e4 LT |
160 | |
161 | sbp->s_flags |= MS_RDONLY; | |
162 | ||
e915fc49 | 163 | infp = kzalloc(sizeof(*infp), GFP_KERNEL); |
1da177e4 LT |
164 | if (!infp) { |
165 | printk(KERN_WARNING "vxfs: unable to allocate incore superblock\n"); | |
166 | return -ENOMEM; | |
167 | } | |
1da177e4 LT |
168 | |
169 | bsize = sb_min_blocksize(sbp, BLOCK_SIZE); | |
170 | if (!bsize) { | |
171 | printk(KERN_WARNING "vxfs: unable to set blocksize\n"); | |
172 | goto out; | |
173 | } | |
174 | ||
175 | bp = sb_bread(sbp, 1); | |
176 | if (!bp || !buffer_mapped(bp)) { | |
177 | if (!silent) { | |
178 | printk(KERN_WARNING | |
179 | "vxfs: unable to read disk superblock\n"); | |
180 | } | |
181 | goto out; | |
182 | } | |
183 | ||
184 | rsbp = (struct vxfs_sb *)bp->b_data; | |
185 | if (rsbp->vs_magic != VXFS_SUPER_MAGIC) { | |
186 | if (!silent) | |
187 | printk(KERN_NOTICE "vxfs: WRONG superblock magic\n"); | |
188 | goto out; | |
189 | } | |
190 | ||
191 | if ((rsbp->vs_version < 2 || rsbp->vs_version > 4) && !silent) { | |
192 | printk(KERN_NOTICE "vxfs: unsupported VxFS version (%d)\n", | |
193 | rsbp->vs_version); | |
194 | goto out; | |
195 | } | |
196 | ||
197 | #ifdef DIAGNOSTIC | |
198 | printk(KERN_DEBUG "vxfs: supported VxFS version (%d)\n", rsbp->vs_version); | |
199 | printk(KERN_DEBUG "vxfs: blocksize: %d\n", rsbp->vs_bsize); | |
200 | #endif | |
201 | ||
202 | sbp->s_magic = rsbp->vs_magic; | |
8cb681b9 | 203 | sbp->s_fs_info = infp; |
1da177e4 LT |
204 | |
205 | infp->vsi_raw = rsbp; | |
206 | infp->vsi_bp = bp; | |
207 | infp->vsi_oltext = rsbp->vs_oltext[0]; | |
208 | infp->vsi_oltsize = rsbp->vs_oltsize; | |
209 | ||
210 | if (!sb_set_blocksize(sbp, rsbp->vs_bsize)) { | |
211 | printk(KERN_WARNING "vxfs: unable to set final block size\n"); | |
212 | goto out; | |
213 | } | |
214 | ||
215 | if (vxfs_read_olt(sbp, bsize)) { | |
216 | printk(KERN_WARNING "vxfs: unable to read olt\n"); | |
217 | goto out; | |
218 | } | |
219 | ||
220 | if (vxfs_read_fshead(sbp)) { | |
221 | printk(KERN_WARNING "vxfs: unable to read fshead\n"); | |
222 | goto out; | |
223 | } | |
224 | ||
225 | sbp->s_op = &vxfs_super_ops; | |
d0b07948 DH |
226 | root = vxfs_iget(sbp, VXFS_ROOT_INO); |
227 | if (IS_ERR(root)) { | |
228 | ret = PTR_ERR(root); | |
229 | goto out; | |
230 | } | |
1da177e4 LT |
231 | sbp->s_root = d_alloc_root(root); |
232 | if (!sbp->s_root) { | |
233 | iput(root); | |
234 | printk(KERN_WARNING "vxfs: unable to get root dentry.\n"); | |
235 | goto out_free_ilist; | |
236 | } | |
237 | ||
238 | return 0; | |
239 | ||
240 | out_free_ilist: | |
241 | vxfs_put_fake_inode(infp->vsi_fship); | |
242 | vxfs_put_fake_inode(infp->vsi_ilist); | |
243 | vxfs_put_fake_inode(infp->vsi_stilist); | |
244 | out: | |
245 | brelse(bp); | |
246 | kfree(infp); | |
d0b07948 | 247 | return ret; |
1da177e4 LT |
248 | } |
249 | ||
250 | /* | |
251 | * The usual module blurb. | |
252 | */ | |
454e2398 DH |
253 | static int vxfs_get_sb(struct file_system_type *fs_type, |
254 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) | |
1da177e4 | 255 | { |
454e2398 DH |
256 | return get_sb_bdev(fs_type, flags, dev_name, data, vxfs_fill_super, |
257 | mnt); | |
1da177e4 LT |
258 | } |
259 | ||
260 | static struct file_system_type vxfs_fs_type = { | |
261 | .owner = THIS_MODULE, | |
262 | .name = "vxfs", | |
263 | .get_sb = vxfs_get_sb, | |
264 | .kill_sb = kill_block_super, | |
265 | .fs_flags = FS_REQUIRES_DEV, | |
266 | }; | |
267 | ||
268 | static int __init | |
269 | vxfs_init(void) | |
270 | { | |
a4376e13 AD |
271 | int rv; |
272 | ||
1da177e4 | 273 | vxfs_inode_cachep = kmem_cache_create("vxfs_inode", |
20c2df83 PM |
274 | sizeof(struct vxfs_inode_info), 0, |
275 | SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD, NULL); | |
a4376e13 AD |
276 | if (!vxfs_inode_cachep) |
277 | return -ENOMEM; | |
278 | rv = register_filesystem(&vxfs_fs_type); | |
279 | if (rv < 0) | |
280 | kmem_cache_destroy(vxfs_inode_cachep); | |
281 | return rv; | |
1da177e4 LT |
282 | } |
283 | ||
284 | static void __exit | |
285 | vxfs_cleanup(void) | |
286 | { | |
287 | unregister_filesystem(&vxfs_fs_type); | |
288 | kmem_cache_destroy(vxfs_inode_cachep); | |
289 | } | |
290 | ||
291 | module_init(vxfs_init); | |
292 | module_exit(vxfs_cleanup); |