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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 | .read_inode = vxfs_read_inode, |
64 | .clear_inode = vxfs_clear_inode, | |
65 | .put_super = vxfs_put_super, | |
66 | .statfs = vxfs_statfs, | |
67 | .remount_fs = vxfs_remount, | |
68 | }; | |
69 | ||
70 | /** | |
71 | * vxfs_put_super - free superblock resources | |
72 | * @sbp: VFS superblock. | |
73 | * | |
74 | * Description: | |
75 | * vxfs_put_super frees all resources allocated for @sbp | |
76 | * after the last instance of the filesystem is unmounted. | |
77 | */ | |
78 | ||
79 | static void | |
80 | vxfs_put_super(struct super_block *sbp) | |
81 | { | |
82 | struct vxfs_sb_info *infp = VXFS_SBI(sbp); | |
83 | ||
84 | vxfs_put_fake_inode(infp->vsi_fship); | |
85 | vxfs_put_fake_inode(infp->vsi_ilist); | |
86 | vxfs_put_fake_inode(infp->vsi_stilist); | |
87 | ||
88 | brelse(infp->vsi_bp); | |
89 | kfree(infp); | |
90 | } | |
91 | ||
92 | /** | |
93 | * vxfs_statfs - get filesystem information | |
726c3342 | 94 | * @dentry: VFS dentry to locate superblock |
1da177e4 LT |
95 | * @bufp: output buffer |
96 | * | |
97 | * Description: | |
98 | * vxfs_statfs fills the statfs buffer @bufp with information | |
726c3342 | 99 | * about the filesystem described by @dentry. |
1da177e4 LT |
100 | * |
101 | * Returns: | |
102 | * Zero. | |
103 | * | |
104 | * Locking: | |
105 | * No locks held. | |
106 | * | |
107 | * Notes: | |
108 | * This is everything but complete... | |
109 | */ | |
110 | static int | |
726c3342 | 111 | vxfs_statfs(struct dentry *dentry, struct kstatfs *bufp) |
1da177e4 | 112 | { |
726c3342 | 113 | struct vxfs_sb_info *infp = VXFS_SBI(dentry->d_sb); |
1da177e4 LT |
114 | |
115 | bufp->f_type = VXFS_SUPER_MAGIC; | |
726c3342 | 116 | bufp->f_bsize = dentry->d_sb->s_blocksize; |
1da177e4 LT |
117 | bufp->f_blocks = infp->vsi_raw->vs_dsize; |
118 | bufp->f_bfree = infp->vsi_raw->vs_free; | |
119 | bufp->f_bavail = 0; | |
120 | bufp->f_files = 0; | |
121 | bufp->f_ffree = infp->vsi_raw->vs_ifree; | |
122 | bufp->f_namelen = VXFS_NAMELEN; | |
123 | ||
124 | return 0; | |
125 | } | |
126 | ||
127 | static int vxfs_remount(struct super_block *sb, int *flags, char *data) | |
128 | { | |
129 | *flags |= MS_RDONLY; | |
130 | return 0; | |
131 | } | |
132 | ||
133 | /** | |
134 | * vxfs_read_super - read superblock into memory and initalize filesystem | |
135 | * @sbp: VFS superblock (to fill) | |
136 | * @dp: fs private mount data | |
137 | * @silent: do not complain loudly when sth is wrong | |
138 | * | |
139 | * Description: | |
140 | * We are called on the first mount of a filesystem to read the | |
141 | * superblock into memory and do some basic setup. | |
142 | * | |
143 | * Returns: | |
144 | * The superblock on success, else %NULL. | |
145 | * | |
146 | * Locking: | |
147 | * We are under the bkl and @sbp->s_lock. | |
148 | */ | |
149 | static int vxfs_fill_super(struct super_block *sbp, void *dp, int silent) | |
150 | { | |
151 | struct vxfs_sb_info *infp; | |
152 | struct vxfs_sb *rsbp; | |
153 | struct buffer_head *bp = NULL; | |
154 | u_long bsize; | |
155 | struct inode *root; | |
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; | |
222 | root = iget(sbp, VXFS_ROOT_INO); | |
223 | sbp->s_root = d_alloc_root(root); | |
224 | if (!sbp->s_root) { | |
225 | iput(root); | |
226 | printk(KERN_WARNING "vxfs: unable to get root dentry.\n"); | |
227 | goto out_free_ilist; | |
228 | } | |
229 | ||
230 | return 0; | |
231 | ||
232 | out_free_ilist: | |
233 | vxfs_put_fake_inode(infp->vsi_fship); | |
234 | vxfs_put_fake_inode(infp->vsi_ilist); | |
235 | vxfs_put_fake_inode(infp->vsi_stilist); | |
236 | out: | |
237 | brelse(bp); | |
238 | kfree(infp); | |
239 | return -EINVAL; | |
240 | } | |
241 | ||
242 | /* | |
243 | * The usual module blurb. | |
244 | */ | |
454e2398 DH |
245 | static int vxfs_get_sb(struct file_system_type *fs_type, |
246 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) | |
1da177e4 | 247 | { |
454e2398 DH |
248 | return get_sb_bdev(fs_type, flags, dev_name, data, vxfs_fill_super, |
249 | mnt); | |
1da177e4 LT |
250 | } |
251 | ||
252 | static struct file_system_type vxfs_fs_type = { | |
253 | .owner = THIS_MODULE, | |
254 | .name = "vxfs", | |
255 | .get_sb = vxfs_get_sb, | |
256 | .kill_sb = kill_block_super, | |
257 | .fs_flags = FS_REQUIRES_DEV, | |
258 | }; | |
259 | ||
260 | static int __init | |
261 | vxfs_init(void) | |
262 | { | |
a4376e13 AD |
263 | int rv; |
264 | ||
1da177e4 | 265 | vxfs_inode_cachep = kmem_cache_create("vxfs_inode", |
20c2df83 PM |
266 | sizeof(struct vxfs_inode_info), 0, |
267 | SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD, NULL); | |
a4376e13 AD |
268 | if (!vxfs_inode_cachep) |
269 | return -ENOMEM; | |
270 | rv = register_filesystem(&vxfs_fs_type); | |
271 | if (rv < 0) | |
272 | kmem_cache_destroy(vxfs_inode_cachep); | |
273 | return rv; | |
1da177e4 LT |
274 | } |
275 | ||
276 | static void __exit | |
277 | vxfs_cleanup(void) | |
278 | { | |
279 | unregister_filesystem(&vxfs_fs_type); | |
280 | kmem_cache_destroy(vxfs_inode_cachep); | |
281 | } | |
282 | ||
283 | module_init(vxfs_init); | |
284 | module_exit(vxfs_cleanup); |