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Linux/fs/freevxfs/vxfs_super.c

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  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>
 43 #include <linux/mount.h>
 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 
 56 
 57 static void             vxfs_put_super(struct super_block *);
 58 static int              vxfs_statfs(struct dentry *, struct kstatfs *);
 59 static int              vxfs_remount(struct super_block *, int *, char *);
 60 
 61 static const struct super_operations vxfs_super_ops = {
 62         .evict_inode =          vxfs_evict_inode,
 63         .put_super =            vxfs_put_super,
 64         .statfs =               vxfs_statfs,
 65         .remount_fs =           vxfs_remount,
 66 };
 67 
 68 /**
 69  * vxfs_put_super - free superblock resources
 70  * @sbp:        VFS superblock.
 71  *
 72  * Description:
 73  *   vxfs_put_super frees all resources allocated for @sbp
 74  *   after the last instance of the filesystem is unmounted.
 75  */
 76 
 77 static void
 78 vxfs_put_super(struct super_block *sbp)
 79 {
 80         struct vxfs_sb_info     *infp = VXFS_SBI(sbp);
 81 
 82         vxfs_put_fake_inode(infp->vsi_fship);
 83         vxfs_put_fake_inode(infp->vsi_ilist);
 84         vxfs_put_fake_inode(infp->vsi_stilist);
 85 
 86         brelse(infp->vsi_bp);
 87         kfree(infp);
 88 }
 89 
 90 /**
 91  * vxfs_statfs - get filesystem information
 92  * @dentry:     VFS dentry to locate superblock
 93  * @bufp:       output buffer
 94  *
 95  * Description:
 96  *   vxfs_statfs fills the statfs buffer @bufp with information
 97  *   about the filesystem described by @dentry.
 98  *
 99  * Returns:
100  *   Zero.
101  *
102  * Locking:
103  *   No locks held.
104  *
105  * Notes:
106  *   This is everything but complete...
107  */
108 static int
109 vxfs_statfs(struct dentry *dentry, struct kstatfs *bufp)
110 {
111         struct vxfs_sb_info             *infp = VXFS_SBI(dentry->d_sb);
112 
113         bufp->f_type = VXFS_SUPER_MAGIC;
114         bufp->f_bsize = dentry->d_sb->s_blocksize;
115         bufp->f_blocks = infp->vsi_raw->vs_dsize;
116         bufp->f_bfree = infp->vsi_raw->vs_free;
117         bufp->f_bavail = 0;
118         bufp->f_files = 0;
119         bufp->f_ffree = infp->vsi_raw->vs_ifree;
120         bufp->f_namelen = VXFS_NAMELEN;
121 
122         return 0;
123 }
124 
125 static int vxfs_remount(struct super_block *sb, int *flags, char *data)
126 {
127         *flags |= MS_RDONLY;
128         return 0;
129 }
130 
131 /**
132  * vxfs_read_super - read superblock into memory and initialize filesystem
133  * @sbp:                VFS superblock (to fill)
134  * @dp:                 fs private mount data
135  * @silent:             do not complain loudly when sth is wrong
136  *
137  * Description:
138  *   We are called on the first mount of a filesystem to read the
139  *   superblock into memory and do some basic setup.
140  *
141  * Returns:
142  *   The superblock on success, else %NULL.
143  *
144  * Locking:
145  *   We are under @sbp->s_lock.
146  */
147 static int vxfs_fill_super(struct super_block *sbp, void *dp, int silent)
148 {
149         struct vxfs_sb_info     *infp;
150         struct vxfs_sb          *rsbp;
151         struct buffer_head      *bp = NULL;
152         u_long                  bsize;
153         struct inode *root;
154         int ret = -EINVAL;
155 
156         sbp->s_flags |= MS_RDONLY;
157 
158         infp = kzalloc(sizeof(*infp), GFP_KERNEL);
159         if (!infp) {
160                 printk(KERN_WARNING "vxfs: unable to allocate incore superblock\n");
161                 return -ENOMEM;
162         }
163 
164         bsize = sb_min_blocksize(sbp, BLOCK_SIZE);
165         if (!bsize) {
166                 printk(KERN_WARNING "vxfs: unable to set blocksize\n");
167                 goto out;
168         }
169 
170         bp = sb_bread(sbp, 1);
171         if (!bp || !buffer_mapped(bp)) {
172                 if (!silent) {
173                         printk(KERN_WARNING
174                                 "vxfs: unable to read disk superblock\n");
175                 }
176                 goto out;
177         }
178 
179         rsbp = (struct vxfs_sb *)bp->b_data;
180         if (rsbp->vs_magic != VXFS_SUPER_MAGIC) {
181                 if (!silent)
182                         printk(KERN_NOTICE "vxfs: WRONG superblock magic\n");
183                 goto out;
184         }
185 
186         if ((rsbp->vs_version < 2 || rsbp->vs_version > 4) && !silent) {
187                 printk(KERN_NOTICE "vxfs: unsupported VxFS version (%d)\n",
188                        rsbp->vs_version);
189                 goto out;
190         }
191 
192 #ifdef DIAGNOSTIC
193         printk(KERN_DEBUG "vxfs: supported VxFS version (%d)\n", rsbp->vs_version);
194         printk(KERN_DEBUG "vxfs: blocksize: %d\n", rsbp->vs_bsize);
195 #endif
196 
197         sbp->s_magic = rsbp->vs_magic;
198         sbp->s_fs_info = infp;
199 
200         infp->vsi_raw = rsbp;
201         infp->vsi_bp = bp;
202         infp->vsi_oltext = rsbp->vs_oltext[0];
203         infp->vsi_oltsize = rsbp->vs_oltsize;
204 
205         if (!sb_set_blocksize(sbp, rsbp->vs_bsize)) {
206                 printk(KERN_WARNING "vxfs: unable to set final block size\n");
207                 goto out;
208         }
209 
210         if (vxfs_read_olt(sbp, bsize)) {
211                 printk(KERN_WARNING "vxfs: unable to read olt\n");
212                 goto out;
213         }
214 
215         if (vxfs_read_fshead(sbp)) {
216                 printk(KERN_WARNING "vxfs: unable to read fshead\n");
217                 goto out;
218         }
219 
220         sbp->s_op = &vxfs_super_ops;
221         root = vxfs_iget(sbp, VXFS_ROOT_INO);
222         if (IS_ERR(root)) {
223                 ret = PTR_ERR(root);
224                 goto out;
225         }
226         sbp->s_root = d_make_root(root);
227         if (!sbp->s_root) {
228                 printk(KERN_WARNING "vxfs: unable to get root dentry.\n");
229                 goto out_free_ilist;
230         }
231 
232         return 0;
233         
234 out_free_ilist:
235         vxfs_put_fake_inode(infp->vsi_fship);
236         vxfs_put_fake_inode(infp->vsi_ilist);
237         vxfs_put_fake_inode(infp->vsi_stilist);
238 out:
239         brelse(bp);
240         kfree(infp);
241         return ret;
242 }
243 
244 /*
245  * The usual module blurb.
246  */
247 static struct dentry *vxfs_mount(struct file_system_type *fs_type,
248         int flags, const char *dev_name, void *data)
249 {
250         return mount_bdev(fs_type, flags, dev_name, data, vxfs_fill_super);
251 }
252 
253 static struct file_system_type vxfs_fs_type = {
254         .owner          = THIS_MODULE,
255         .name           = "vxfs",
256         .mount          = vxfs_mount,
257         .kill_sb        = kill_block_super,
258         .fs_flags       = FS_REQUIRES_DEV,
259 };
260 MODULE_ALIAS_FS("vxfs"); /* makes mount -t vxfs autoload the module */
261 MODULE_ALIAS("vxfs");
262 
263 static int __init
264 vxfs_init(void)
265 {
266         int rv;
267 
268         vxfs_inode_cachep = kmem_cache_create("vxfs_inode",
269                         sizeof(struct vxfs_inode_info), 0,
270                         SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD, NULL);
271         if (!vxfs_inode_cachep)
272                 return -ENOMEM;
273         rv = register_filesystem(&vxfs_fs_type);
274         if (rv < 0)
275                 kmem_cache_destroy(vxfs_inode_cachep);
276         return rv;
277 }
278 
279 static void __exit
280 vxfs_cleanup(void)
281 {
282         unregister_filesystem(&vxfs_fs_type);
283         /*
284          * Make sure all delayed rcu free inodes are flushed before we
285          * destroy cache.
286          */
287         rcu_barrier();
288         kmem_cache_destroy(vxfs_inode_cachep);
289 }
290 
291 module_init(vxfs_init);
292 module_exit(vxfs_cleanup);
293 

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