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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
59
60
61
62
63
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
80
81
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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_free_inode(struct inode *inode)
135{
136 kmem_cache_free(vxfs_inode_cachep, VXFS_INO(inode));
137}
138
139static const struct super_operations vxfs_super_ops = {
140 .alloc_inode = vxfs_alloc_inode,
141 .free_inode = vxfs_free_inode,
142 .evict_inode = vxfs_evict_inode,
143 .put_super = vxfs_put_super,
144 .statfs = vxfs_statfs,
145 .remount_fs = vxfs_remount,
146};
147
148static int vxfs_try_sb_magic(struct super_block *sbp, int silent,
149 unsigned blk, __fs32 magic)
150{
151 struct buffer_head *bp;
152 struct vxfs_sb *rsbp;
153 struct vxfs_sb_info *infp = VXFS_SBI(sbp);
154 int rc = -ENOMEM;
155
156 bp = sb_bread(sbp, blk);
157 do {
158 if (!bp || !buffer_mapped(bp)) {
159 if (!silent) {
160 printk(KERN_WARNING
161 "vxfs: unable to read disk superblock at %u\n",
162 blk);
163 }
164 break;
165 }
166
167 rc = -EINVAL;
168 rsbp = (struct vxfs_sb *)bp->b_data;
169 if (rsbp->vs_magic != magic) {
170 if (!silent)
171 printk(KERN_NOTICE
172 "vxfs: WRONG superblock magic %08x at %u\n",
173 rsbp->vs_magic, blk);
174 break;
175 }
176
177 rc = 0;
178 infp->vsi_raw = rsbp;
179 infp->vsi_bp = bp;
180 } while (0);
181
182 if (rc) {
183 infp->vsi_raw = NULL;
184 infp->vsi_bp = NULL;
185 brelse(bp);
186 }
187
188 return rc;
189}
190
191
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197
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201
202
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204
205
206
207static int vxfs_fill_super(struct super_block *sbp, void *dp, int silent)
208{
209 struct vxfs_sb_info *infp;
210 struct vxfs_sb *rsbp;
211 u_long bsize;
212 struct inode *root;
213 int ret = -EINVAL;
214 u32 j;
215
216 sbp->s_flags |= SB_RDONLY;
217
218 infp = kzalloc(sizeof(*infp), GFP_KERNEL);
219 if (!infp) {
220 printk(KERN_WARNING "vxfs: unable to allocate incore superblock\n");
221 return -ENOMEM;
222 }
223
224 bsize = sb_min_blocksize(sbp, BLOCK_SIZE);
225 if (!bsize) {
226 printk(KERN_WARNING "vxfs: unable to set blocksize\n");
227 goto out;
228 }
229
230 sbp->s_op = &vxfs_super_ops;
231 sbp->s_fs_info = infp;
232
233 if (!vxfs_try_sb_magic(sbp, silent, 1,
234 (__force __fs32)cpu_to_le32(VXFS_SUPER_MAGIC))) {
235
236 infp->byte_order = VXFS_BO_LE;
237 } else if (!vxfs_try_sb_magic(sbp, silent, 8,
238 (__force __fs32)cpu_to_be32(VXFS_SUPER_MAGIC))) {
239
240 infp->byte_order = VXFS_BO_BE;
241 } else {
242 if (!silent)
243 printk(KERN_NOTICE "vxfs: can't find superblock.\n");
244 goto out;
245 }
246
247 rsbp = infp->vsi_raw;
248 j = fs32_to_cpu(infp, rsbp->vs_version);
249 if ((j < 2 || j > 4) && !silent) {
250 printk(KERN_NOTICE "vxfs: unsupported VxFS version (%d)\n", j);
251 goto out;
252 }
253
254#ifdef DIAGNOSTIC
255 printk(KERN_DEBUG "vxfs: supported VxFS version (%d)\n", j);
256 printk(KERN_DEBUG "vxfs: blocksize: %d\n",
257 fs32_to_cpu(infp, rsbp->vs_bsize));
258#endif
259
260 sbp->s_magic = fs32_to_cpu(infp, rsbp->vs_magic);
261
262 infp->vsi_oltext = fs32_to_cpu(infp, rsbp->vs_oltext[0]);
263 infp->vsi_oltsize = fs32_to_cpu(infp, rsbp->vs_oltsize);
264
265 j = fs32_to_cpu(infp, rsbp->vs_bsize);
266 if (!sb_set_blocksize(sbp, j)) {
267 printk(KERN_WARNING "vxfs: unable to set final block size\n");
268 goto out;
269 }
270
271 if (vxfs_read_olt(sbp, bsize)) {
272 printk(KERN_WARNING "vxfs: unable to read olt\n");
273 goto out;
274 }
275
276 if (vxfs_read_fshead(sbp)) {
277 printk(KERN_WARNING "vxfs: unable to read fshead\n");
278 goto out;
279 }
280
281 root = vxfs_iget(sbp, VXFS_ROOT_INO);
282 if (IS_ERR(root)) {
283 ret = PTR_ERR(root);
284 goto out;
285 }
286 sbp->s_root = d_make_root(root);
287 if (!sbp->s_root) {
288 printk(KERN_WARNING "vxfs: unable to get root dentry.\n");
289 goto out_free_ilist;
290 }
291
292 return 0;
293
294out_free_ilist:
295 iput(infp->vsi_fship);
296 iput(infp->vsi_ilist);
297 iput(infp->vsi_stilist);
298out:
299 brelse(infp->vsi_bp);
300 kfree(infp);
301 return ret;
302}
303
304
305
306
307static struct dentry *vxfs_mount(struct file_system_type *fs_type,
308 int flags, const char *dev_name, void *data)
309{
310 return mount_bdev(fs_type, flags, dev_name, data, vxfs_fill_super);
311}
312
313static struct file_system_type vxfs_fs_type = {
314 .owner = THIS_MODULE,
315 .name = "vxfs",
316 .mount = vxfs_mount,
317 .kill_sb = kill_block_super,
318 .fs_flags = FS_REQUIRES_DEV,
319};
320MODULE_ALIAS_FS("vxfs");
321MODULE_ALIAS("vxfs");
322
323static int __init
324vxfs_init(void)
325{
326 int rv;
327
328 vxfs_inode_cachep = kmem_cache_create_usercopy("vxfs_inode",
329 sizeof(struct vxfs_inode_info), 0,
330 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
331 offsetof(struct vxfs_inode_info, vii_immed.vi_immed),
332 sizeof_field(struct vxfs_inode_info,
333 vii_immed.vi_immed),
334 NULL);
335 if (!vxfs_inode_cachep)
336 return -ENOMEM;
337 rv = register_filesystem(&vxfs_fs_type);
338 if (rv < 0)
339 kmem_cache_destroy(vxfs_inode_cachep);
340 return rv;
341}
342
343static void __exit
344vxfs_cleanup(void)
345{
346 unregister_filesystem(&vxfs_fs_type);
347
348
349
350
351 rcu_barrier();
352 kmem_cache_destroy(vxfs_inode_cachep);
353}
354
355module_init(vxfs_init);
356module_exit(vxfs_cleanup);
357