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Linux/fs/freevxfs/vxfs_super.c

  1 /*
  2  * Copyright (c) 2000-2001 Christoph Hellwig.
  3  * Copyright (c) 2016 Krzysztof Blaszkowski
  4  * All rights reserved.
  5  *
  6  * Redistribution and use in source and binary forms, with or without
  7  * modification, are permitted provided that the following conditions
  8  * are met:
  9  * 1. Redistributions of source code must retain the above copyright
 10  *    notice, this list of conditions, and the following disclaimer,
 11  *    without modification.
 12  * 2. The name of the author may not be used to endorse or promote products
 13  *    derived from this software without specific prior written permission.
 14  *
 15  * Alternatively, this software may be distributed under the terms of the
 16  * GNU General Public License ("GPL").
 17  *
 18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 21  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
 22  * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 28  * SUCH DAMAGE.
 29  */
 30 
 31 /*
 32  * Veritas filesystem driver - superblock related routines.
 33  */
 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 
 52 MODULE_AUTHOR("Christoph Hellwig, Krzysztof Blaszkowski");
 53 MODULE_DESCRIPTION("Veritas Filesystem (VxFS) driver");
 54 MODULE_LICENSE("Dual BSD/GPL");
 55 
 56 static struct kmem_cache *vxfs_inode_cachep;
 57 
 58 /**
 59  * vxfs_put_super - free superblock resources
 60  * @sbp:        VFS superblock.
 61  *
 62  * Description:
 63  *   vxfs_put_super frees all resources allocated for @sbp
 64  *   after the last instance of the filesystem is unmounted.
 65  */
 66 
 67 static void
 68 vxfs_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  * vxfs_statfs - get filesystem information
 82  * @dentry:     VFS dentry to locate superblock
 83  * @bufp:       output buffer
 84  *
 85  * Description:
 86  *   vxfs_statfs fills the statfs buffer @bufp with information
 87  *   about the filesystem described by @dentry.
 88  *
 89  * Returns:
 90  *   Zero.
 91  *
 92  * Locking:
 93  *   No locks held.
 94  *
 95  * Notes:
 96  *   This is everything but complete...
 97  */
 98 static int
 99 vxfs_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 
116 static int vxfs_remount(struct super_block *sb, int *flags, char *data)
117 {
118         sync_filesystem(sb);
119         *flags |= MS_RDONLY;
120         return 0;
121 }
122 
123 static 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 
134 static 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 
141 static void vxfs_destroy_inode(struct inode *inode)
142 {
143         call_rcu(&inode->i_rcu, vxfs_i_callback);
144 }
145 
146 static 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 
155 static 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 
198 /**
199  * vxfs_read_super - read superblock into memory and initialize filesystem
200  * @sbp:                VFS superblock (to fill)
201  * @dp:                 fs private mount data
202  * @silent:             do not complain loudly when sth is wrong
203  *
204  * Description:
205  *   We are called on the first mount of a filesystem to read the
206  *   superblock into memory and do some basic setup.
207  *
208  * Returns:
209  *   The superblock on success, else %NULL.
210  *
211  * Locking:
212  *   We are under @sbp->s_lock.
213  */
214 static 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 |= MS_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                 /* Unixware, x86 */
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                 /* HP-UX, parisc */
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         
301 out_free_ilist:
302         iput(infp->vsi_fship);
303         iput(infp->vsi_ilist);
304         iput(infp->vsi_stilist);
305 out:
306         brelse(infp->vsi_bp);
307         kfree(infp);
308         return ret;
309 }
310 
311 /*
312  * The usual module blurb.
313  */
314 static 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 
320 static 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 };
327 MODULE_ALIAS_FS("vxfs"); /* makes mount -t vxfs autoload the module */
328 MODULE_ALIAS("vxfs");
329 
330 static int __init
331 vxfs_init(void)
332 {
333         int rv;
334 
335         vxfs_inode_cachep = kmem_cache_create("vxfs_inode",
336                         sizeof(struct vxfs_inode_info), 0,
337                         SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD, NULL);
338         if (!vxfs_inode_cachep)
339                 return -ENOMEM;
340         rv = register_filesystem(&vxfs_fs_type);
341         if (rv < 0)
342                 kmem_cache_destroy(vxfs_inode_cachep);
343         return rv;
344 }
345 
346 static void __exit
347 vxfs_cleanup(void)
348 {
349         unregister_filesystem(&vxfs_fs_type);
350         /*
351          * Make sure all delayed rcu free inodes are flushed before we
352          * destroy cache.
353          */
354         rcu_barrier();
355         kmem_cache_destroy(vxfs_inode_cachep);
356 }
357 
358 module_init(vxfs_init);
359 module_exit(vxfs_cleanup);
360 

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