2 * OBDFS Super operations
4 * Copryright (C) 1996 Peter J. Braam <braam@stelias.com>
5 * Copryright (C) 1999 Stelias Computing Inc. <braam@stelias.com>
6 * Copryright (C) 1999 Seagate Technology Inc.
12 #include <linux/config.h>
13 #include <linux/module.h>
14 #include <linux/kernel.h>
16 #include <linux/string.h>
17 #include <linux/stat.h>
18 #include <linux/errno.h>
19 #include <linux/locks.h>
20 #include <linux/unistd.h>
22 #include <asm/system.h>
23 #include <asm/uaccess.h>
26 #include <linux/stat.h>
27 #include <asm/uaccess.h>
28 #include <linux/vmalloc.h>
29 #include <asm/segment.h>
31 #include <linux/obd_support.h>
32 #include <linux/obd_class.h>
33 #include <linux/obdfs.h>
35 /* VFS super_block ops */
36 static struct super_block *obdfs_read_super(struct super_block *, void *, int);
37 static int obdfs_notify_change(struct dentry *dentry, struct iattr *attr);
38 static void obdfs_write_inode(struct inode *);
39 static void obdfs_delete_inode(struct inode *);
40 static void obdfs_put_super(struct super_block *);
41 static int obdfs_statfs(struct super_block *sb, struct statfs *buf,
44 /* exported operations */
45 struct super_operations obdfs_super_operations =
47 obdfs_read_inode, /* read_inode */
48 obdfs_write_inode, /* write_inode */
50 obdfs_delete_inode, /* delete_inode */
51 obdfs_notify_change, /* notify_change */
52 obdfs_put_super, /* put_super */
53 NULL, /* write_super */
54 obdfs_statfs, /* statfs */
58 struct list_head obdfs_super_list;
60 static char *obdfs_read_opt(const char *opt, char *data)
65 CDEBUG(D_SUPER, "option: %s, data %s\n", opt, data);
66 if ( strncmp(opt, data, strlen(opt)) )
69 if ( (value = strchr(data, '=')) == NULL )
73 OBD_ALLOC(retval, char *, strlen(value) + 1);
75 printk("OBDFS: Out of memory!\n");
79 memcpy(retval, value, strlen(value)+1);
80 CDEBUG(D_SUPER, "Assigned option: %s, value %s\n", opt, retval);
84 void obdfs_options(char *options, char **dev, char **vers)
91 for (this_char = strtok (options, ",");
93 this_char = strtok (NULL, ",")) {
94 CDEBUG(D_SUPER, "this_char %s\n", this_char);
95 if ( (!*dev && (*dev = obdfs_read_opt("device", this_char)))||
96 (!*vers && (*vers = obdfs_read_opt("version", this_char))) )
102 static int obdfs_getdev(char *devpath, int *dev)
104 struct dentry *dentry;
107 dentry = lookup_dentry(devpath, NULL, 0);
109 return PTR_ERR(dentry);
111 if (!S_ISCHR(dentry->d_inode->i_mode))
114 devno = dentry->d_inode->i_rdev;
115 if ( MAJOR(devno) != OBD_PSDEV_MAJOR )
118 if ( MINOR(devno) >= MAX_OBD_DEVICES )
126 /* XXX allocate a super_entry, and add the super to the obdfs_super_list */
127 static struct super_block * obdfs_read_super(struct super_block *sb,
128 void *data, int silent)
130 struct inode *root = 0;
131 struct obdfs_sb_info *sbi = (struct obdfs_sb_info *)(&sb->u.generic_sbp);
132 struct obd_device *obddev;
135 char *version = NULL;
138 unsigned long blocksize;
139 unsigned long blocksize_bits;
140 unsigned long root_ino;
147 memset(sbi, 0, sizeof(*sbi));
149 obdfs_options(data, &device, &version);
151 printk("No device\n");
157 if ( (err = obdfs_getdev(device, &devno)) ) {
158 printk("Cannot get devno of %s, error %d\n", device, err);
164 if ( MAJOR(devno) != OBD_PSDEV_MAJOR ) {
165 printk("Wrong major number!\n");
171 if ( MINOR(devno) >= MAX_OBD_DEVICES ) {
172 printk("Minor of %s too high (%d)\n", device, MINOR(devno));
178 obddev = &obd_dev[MINOR(devno)];
180 if ( ! (obddev->obd_flags & OBD_ATTACHED) ||
181 ! (obddev->obd_flags & OBD_SET_UP) ){
182 printk("Device %s not attached or not set up (%d)\n",
183 device, MINOR(devno));
189 sbi->osi_obd = obddev;
190 sbi->osi_ops = sbi->osi_obd->obd_type->typ_ops;
192 sbi->osi_conn.oc_dev = obddev;
193 error = sbi->osi_ops->o_connect(&sbi->osi_conn);
195 printk("OBDFS: cannot connect to %s\n", device);
199 INIT_LIST_HEAD(&sbi->osi_list);
203 error = sbi->osi_ops->o_get_info(&sbi->osi_conn,
206 &scratch, (void *)&blocksize);
208 printk("Getinfo call to drive failed (blocksize)\n");
212 error = sbi->osi_ops->o_get_info(&sbi->osi_conn,
213 strlen("blocksize_bits"),
215 &scratch, (void *)&blocksize_bits);
217 printk("Getinfo call to drive failed (blocksize_bits)\n");
221 error = sbi->osi_ops->o_get_info(&sbi->osi_conn,
224 &scratch, (void *)&root_ino);
226 printk("Getinfo call to drive failed (root_ino)\n");
234 sb->s_blocksize = blocksize;
235 sb->s_blocksize_bits = (unsigned char)blocksize_bits;
236 sb->s_magic = OBDFS_SUPER_MAGIC;
237 sb->s_op = &obdfs_super_operations;
239 /* make root inode */
240 root = iget(sb, root_ino);
241 if (!root || is_bad_inode(root)) {
242 printk("OBDFS: bad iget for root\n");
250 printk("obdfs_read_super: sbdev %d, rootino: %ld, dev %s, "
251 "minor: %d, blocksize: %ld, blocksize bits %ld\n",
252 sb->s_dev, root->i_ino, device, MINOR(devno),
253 blocksize, blocksize_bits);
254 sb->s_root = d_alloc_root(root);
263 sbi->osi_super = NULL;
272 /* XXX remove the super to the obdfs_super_list */
273 static void obdfs_put_super(struct super_block *sb)
275 struct obdfs_sb_info *sbi;
282 /* XXX flush stuff */
283 sbi = (struct obdfs_sb_info *) &sb->u.generic_sbp;
285 OPS(sb,disconnect)(ID(sb));
287 memset(sbi, 0, sizeof(* sbi));
289 printk("OBDFS: Bye bye.\n");
295 /* all filling in of inodes postponed until lookup */
296 void obdfs_read_inode(struct inode *inode)
304 printk("obdfs_read_inode: obdo_alloc failed\n");
308 oa->o_valid = ~OBD_MD_FLOBDMD;
309 oa->o_id = inode->i_ino;
310 err = IOPS(inode, getattr)(IID(inode), oa);
312 printk("obdfs_read_inode: obd_getattr fails (%d)\n", err);
319 obdo_to_inode(inode, oa);
323 if (S_ISREG(inode->i_mode))
324 inode->i_op = &obdfs_file_inode_operations;
325 else if (S_ISDIR(inode->i_mode))
326 inode->i_op = &obdfs_dir_inode_operations;
327 else if (S_ISLNK(inode->i_mode))
328 inode->i_op = &obdfs_symlink_inode_operations;
330 /* XXX what do we pass here??? */
331 init_special_inode(inode, inode->i_mode, 0 /* XXX XXX */ );
335 static void obdfs_write_inode(struct inode *inode)
341 oa->o_valid = OBD_MD_FLALL;
342 obdo_from_inode(oa, inode);
343 err = IOPS(inode, setattr)(IID(inode), oa);
348 printk("obdfs_write_inode: obd_setattr fails (%d)\n", err);
355 static void obdfs_delete_inode(struct inode *inode)
362 /* XXX we currently assume "id" is all that's needed for destroy */
363 oa->o_id = inode->i_ino;
364 err = IOPS(inode, destroy)(IID(inode), oa);
368 printk("obdfs_delete_node: obd_destroy fails (%d)\n", err);
378 static int obdfs_notify_change(struct dentry *de, struct iattr *attr)
380 struct inode *inode = de->d_inode;
387 printk("obdfs_notify_change: obdo_alloc fails\n");
391 oa->o_id = inode->i_ino;
392 obdo_from_iattr(oa, attr);
393 err = IOPS(inode, setattr)(IID(inode), oa);
395 printk("obdfs_notify_change: obd_setattr fails (%d)\n", err);
398 inode_setattr(inode, attr);
400 CDEBUG(D_INODE, "inode blocks now %ld\n", inode->i_blocks);
406 static int obdfs_statfs(struct super_block *sb, struct statfs *buf,
414 err = OPS(sb,statfs)(ID(sb), &tmp);
416 printk("obdfs_notify_change: obd_statfs fails (%d)\n", err);
419 copy_to_user(buf, &tmp, (bufsize<sizeof(tmp)) ? bufsize : sizeof(tmp));
426 struct file_system_type obdfs_fs_type = {
427 "obdfs", 0, obdfs_read_super, NULL
434 printk(KERN_INFO "OBDFS v0.1, braam@stelias.com\n");
438 INIT_LIST_HEAD(&obdfs_super_list);
439 err = obdfs_init_wreqcache();
447 return register_filesystem(&obdfs_fs_type);
452 int init_module(void)
457 void cleanup_module(void)
461 obdfs_sysctl_clean();
462 unregister_filesystem(&obdfs_fs_type);