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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
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64
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
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96
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_i_callback(struct rcu_head *head)
135{
136 struct inode *inode = container_of(head, struct inode, i_rcu);
137
138 kmem_cache_free(vxfs_inode_cachep, VXFS_INO(inode));
139}
140
141static void vxfs_destroy_inode(struct inode *inode)
142{
143 call_rcu(&inode->i_rcu, vxfs_i_callback);
144}
145
146static const struct super_operations vxfs_super_ops = {
147 .alloc_inode = vxfs_alloc_inode,
148 .destroy_inode = vxfs_destroy_inode,
149 .evict_inode = vxfs_evict_inode,
150 .put_super = vxfs_put_super,
151 .statfs = vxfs_statfs,
152 .remount_fs = vxfs_remount,
153};
154
155static int vxfs_try_sb_magic(struct super_block *sbp, int silent,
156 unsigned blk, __fs32 magic)
157{
158 struct buffer_head *bp;
159 struct vxfs_sb *rsbp;
160 struct vxfs_sb_info *infp = VXFS_SBI(sbp);
161 int rc = -ENOMEM;
162
163 bp = sb_bread(sbp, blk);
164 do {
165 if (!bp || !buffer_mapped(bp)) {
166 if (!silent) {
167 printk(KERN_WARNING
168 "vxfs: unable to read disk superblock at %u\n",
169 blk);
170 }
171 break;
172 }
173
174 rc = -EINVAL;
175 rsbp = (struct vxfs_sb *)bp->b_data;
176 if (rsbp->vs_magic != magic) {
177 if (!silent)
178 printk(KERN_NOTICE
179 "vxfs: WRONG superblock magic %08x at %u\n",
180 rsbp->vs_magic, blk);
181 break;
182 }
183
184 rc = 0;
185 infp->vsi_raw = rsbp;
186 infp->vsi_bp = bp;
187 } while (0);
188
189 if (rc) {
190 infp->vsi_raw = NULL;
191 infp->vsi_bp = NULL;
192 brelse(bp);
193 }
194
195 return rc;
196}
197
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213
214static int vxfs_fill_super(struct super_block *sbp, void *dp, int silent)
215{
216 struct vxfs_sb_info *infp;
217 struct vxfs_sb *rsbp;
218 u_long bsize;
219 struct inode *root;
220 int ret = -EINVAL;
221 u32 j;
222
223 sbp->s_flags |= SB_RDONLY;
224
225 infp = kzalloc(sizeof(*infp), GFP_KERNEL);
226 if (!infp) {
227 printk(KERN_WARNING "vxfs: unable to allocate incore superblock\n");
228 return -ENOMEM;
229 }
230
231 bsize = sb_min_blocksize(sbp, BLOCK_SIZE);
232 if (!bsize) {
233 printk(KERN_WARNING "vxfs: unable to set blocksize\n");
234 goto out;
235 }
236
237 sbp->s_op = &vxfs_super_ops;
238 sbp->s_fs_info = infp;
239
240 if (!vxfs_try_sb_magic(sbp, silent, 1,
241 (__force __fs32)cpu_to_le32(VXFS_SUPER_MAGIC))) {
242
243 infp->byte_order = VXFS_BO_LE;
244 } else if (!vxfs_try_sb_magic(sbp, silent, 8,
245 (__force __fs32)cpu_to_be32(VXFS_SUPER_MAGIC))) {
246
247 infp->byte_order = VXFS_BO_BE;
248 } else {
249 if (!silent)
250 printk(KERN_NOTICE "vxfs: can't find superblock.\n");
251 goto out;
252 }
253
254 rsbp = infp->vsi_raw;
255 j = fs32_to_cpu(infp, rsbp->vs_version);
256 if ((j < 2 || j > 4) && !silent) {
257 printk(KERN_NOTICE "vxfs: unsupported VxFS version (%d)\n", j);
258 goto out;
259 }
260
261#ifdef DIAGNOSTIC
262 printk(KERN_DEBUG "vxfs: supported VxFS version (%d)\n", j);
263 printk(KERN_DEBUG "vxfs: blocksize: %d\n",
264 fs32_to_cpu(infp, rsbp->vs_bsize));
265#endif
266
267 sbp->s_magic = fs32_to_cpu(infp, rsbp->vs_magic);
268
269 infp->vsi_oltext = fs32_to_cpu(infp, rsbp->vs_oltext[0]);
270 infp->vsi_oltsize = fs32_to_cpu(infp, rsbp->vs_oltsize);
271
272 j = fs32_to_cpu(infp, rsbp->vs_bsize);
273 if (!sb_set_blocksize(sbp, j)) {
274 printk(KERN_WARNING "vxfs: unable to set final block size\n");
275 goto out;
276 }
277
278 if (vxfs_read_olt(sbp, bsize)) {
279 printk(KERN_WARNING "vxfs: unable to read olt\n");
280 goto out;
281 }
282
283 if (vxfs_read_fshead(sbp)) {
284 printk(KERN_WARNING "vxfs: unable to read fshead\n");
285 goto out;
286 }
287
288 root = vxfs_iget(sbp, VXFS_ROOT_INO);
289 if (IS_ERR(root)) {
290 ret = PTR_ERR(root);
291 goto out;
292 }
293 sbp->s_root = d_make_root(root);
294 if (!sbp->s_root) {
295 printk(KERN_WARNING "vxfs: unable to get root dentry.\n");
296 goto out_free_ilist;
297 }
298
299 return 0;
300
301out_free_ilist:
302 iput(infp->vsi_fship);
303 iput(infp->vsi_ilist);
304 iput(infp->vsi_stilist);
305out:
306 brelse(infp->vsi_bp);
307 kfree(infp);
308 return ret;
309}
310
311
312
313
314static struct dentry *vxfs_mount(struct file_system_type *fs_type,
315 int flags, const char *dev_name, void *data)
316{
317 return mount_bdev(fs_type, flags, dev_name, data, vxfs_fill_super);
318}
319
320static struct file_system_type vxfs_fs_type = {
321 .owner = THIS_MODULE,
322 .name = "vxfs",
323 .mount = vxfs_mount,
324 .kill_sb = kill_block_super,
325 .fs_flags = FS_REQUIRES_DEV,
326};
327MODULE_ALIAS_FS("vxfs");
328MODULE_ALIAS("vxfs");
329
330static int __init
331vxfs_init(void)
332{
333 int rv;
334
335 vxfs_inode_cachep = kmem_cache_create_usercopy("vxfs_inode",
336 sizeof(struct vxfs_inode_info), 0,
337 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
338 offsetof(struct vxfs_inode_info, vii_immed.vi_immed),
339 sizeof_field(struct vxfs_inode_info,
340 vii_immed.vi_immed),
341 NULL);
342 if (!vxfs_inode_cachep)
343 return -ENOMEM;
344 rv = register_filesystem(&vxfs_fs_type);
345 if (rv < 0)
346 kmem_cache_destroy(vxfs_inode_cachep);
347 return rv;
348}
349
350static void __exit
351vxfs_cleanup(void)
352{
353 unregister_filesystem(&vxfs_fs_type);
354
355
356
357
358 rcu_barrier();
359 kmem_cache_destroy(vxfs_inode_cachep);
360}
361
362module_init(vxfs_init);
363module_exit(vxfs_cleanup);
364