3 * OBDFS Super operations
5 * This code is issued under the GNU General Public License.
6 * See the file COPYING in this distribution
8 * Copryright (C) 1996 Peter J. Braam <braam@stelias.com>
9 * Copryright (C) 1999 Stelias Computing Inc. <braam@stelias.com>
10 * Copryright (C) 1999 Seagate Technology Inc.
11 * Copryright (C) 2001 Mountain View Data, Inc.
15 #include <linux/config.h>
16 #include <linux/module.h>
17 #include <linux/kernel.h>
19 #include <linux/string.h>
20 #include <linux/stat.h>
21 #include <linux/errno.h>
22 #include <linux/locks.h>
23 #include <linux/unistd.h>
25 #include <asm/system.h>
26 #include <asm/uaccess.h>
29 #include <linux/stat.h>
30 #include <asm/uaccess.h>
31 #include <linux/vmalloc.h>
32 #include <asm/segment.h>
34 #include <linux/obd_support.h>
35 #include <linux/obd_class.h>
36 #include <linux/obdfs.h>
38 struct list_head obdfs_super_list;
39 extern struct address_space_operations obdfs_aops;
40 struct super_operations obdfs_super_operations;
41 long obdfs_cache_count = 0;
42 long obdfs_mutex_start = 0;
45 static char *obdfs_read_opt(const char *opt, char *data)
50 CDEBUG(D_INFO, "option: %s, data %s\n", opt, data);
51 if ( strncmp(opt, data, strlen(opt)) )
54 if ( (value = strchr(data, '=')) == NULL )
58 OBD_ALLOC(retval, char *, strlen(value) + 1);
60 printk(KERN_ALERT __FUNCTION__ ": out of memory!\n");
64 memcpy(retval, value, strlen(value)+1);
65 CDEBUG(D_PSDEV, "Assigned option: %s, value %s\n", opt, retval);
69 static void obdfs_options(char *options, char **dev, char **vers)
76 for (this_char = strtok (options, ",");
78 this_char = strtok (NULL, ",")) {
79 CDEBUG(D_INFO, "this_char %s\n", this_char);
80 if ( (!*dev && (*dev = obdfs_read_opt("device", this_char)))||
81 (!*vers && (*vers = obdfs_read_opt("version", this_char))) )
87 static int obdfs_getdev(char *devpath, int *dev)
89 struct dentry *dentry;
95 if (path_init(devpath, LOOKUP_POSITIVE, &nd))
96 error = path_walk(devpath, &nd);
101 if (!S_ISCHR(dentry->d_inode->i_mode))
104 devno = dentry->d_inode->i_rdev;
105 if ( MAJOR(devno) != OBD_PSDEV_MAJOR )
108 if ( MINOR(devno) >= MAX_OBD_DEVICES )
116 static struct super_block * obdfs_read_super(struct super_block *sb,
117 void *data, int silent)
119 struct inode *root = 0;
120 struct obdfs_sb_info *sbi = (struct obdfs_sb_info *)(&sb->u.generic_sbp);
121 struct obd_device *obddev;
123 char *version = NULL;
127 unsigned long blocksize;
128 unsigned long blocksize_bits;
129 unsigned long root_ino;
137 memset(sbi, 0, sizeof(*sbi));
139 CDEBUG(D_INFO, "\n");
140 obdfs_options(data, &device, &version);
142 printk(__FUNCTION__ ": no device\n");
147 CDEBUG(D_INFO, "\n");
148 if ( (err = obdfs_getdev(device, &devno)) ) {
149 printk("Cannot get devno of %s, error %d\n", device, err);
154 CDEBUG(D_INFO, "\n");
155 if ( MAJOR(devno) != OBD_PSDEV_MAJOR ) {
156 printk(__FUNCTION__ ": wrong major number %d!\n", MAJOR(devno));
161 CDEBUG(D_INFO, "\n");
162 if ( MINOR(devno) >= MAX_OBD_DEVICES ) {
163 printk(__FUNCTION__ ": minor of %s too high (%d)\n",
164 device, MINOR(devno));
169 CDEBUG(D_INFO, "\n");
170 obddev = &obd_dev[MINOR(devno)];
172 CDEBUG(D_INFO, "\n");
173 if ( ! (obddev->obd_flags & OBD_ATTACHED) ||
174 ! (obddev->obd_flags & OBD_SET_UP) ){
175 printk("device %s not attached or not set up (%d)\n",
176 device, MINOR(devno));
181 CDEBUG(D_INFO, "\n");
182 sbi->osi_obd = obddev;
183 sbi->osi_ops = sbi->osi_obd->obd_type->typ_ops;
185 sbi->osi_conn.oc_dev = obddev;
186 err = sbi->osi_ops->o_connect(&sbi->osi_conn);
188 printk("OBDFS: cannot connect to %s\n", device);
193 CDEBUG(D_INFO, "\n");
194 /* list of dirty inodes, and a mutex to hold while modifying it */
195 INIT_LIST_HEAD(&sbi->osi_inodes);
196 init_MUTEX (&sbi->osi_list_mutex);
198 CDEBUG(D_INFO, "\n");
201 CDEBUG(D_INFO, "\n");
202 err = sbi->osi_ops->o_get_info(&sbi->osi_conn, strlen("blocksize"),
203 "blocksize", &scratch,
206 printk("getinfo call to drive failed (blocksize)\n");
211 CDEBUG(D_INFO, "\n");
212 err = sbi->osi_ops->o_get_info(&sbi->osi_conn, strlen("blocksize_bits"),
213 "blocksize_bits", &scratch,
214 (void *)&blocksize_bits);
216 printk("getinfo call to drive failed (blocksize_bits)\n");
221 CDEBUG(D_INFO, "\n");
222 err = sbi->osi_ops->o_get_info(&sbi->osi_conn, strlen("root_ino"),
223 "root_ino", &scratch, (void *)&root_ino);
225 printk("getinfo call to drive failed (root_ino)\n");
230 CDEBUG(D_INFO, "\n");
231 sb->s_maxbytes = 1LL << 36;
232 printk("Max bytes: %Lx\n", sb->s_maxbytes);
233 sb->s_blocksize = PAGE_SIZE;
234 sb->s_blocksize_bits = (unsigned char)PAGE_SHIFT;
235 sb->s_magic = OBDFS_SUPER_MAGIC;
236 sb->s_op = &obdfs_super_operations;
238 /* XXX how to get "sb->s_flags |= MS_RDONLY" here for snapshots? */
240 /* make root inode */
241 CDEBUG(D_INFO, "\n");
242 oa = obdo_fromid(&sbi->osi_conn, root_ino, S_IFDIR,
243 OBD_MD_FLNOTOBD | OBD_MD_FLBLOCKS);
244 CDEBUG(D_INFO, "mode %o\n", oa->o_mode);
246 printk(__FUNCTION__ ": obdo_fromid failed\n");
251 CDEBUG(D_INFO, "\n");
252 root = iget4(sb, root_ino, NULL, oa);
254 CDEBUG(D_INFO, "\n");
256 printk("OBDFS: bad iget4 for root\n");
263 CDEBUG(D_INFO, "obdfs_read_super: sbdev %d, rootino: %ld, dev %s, "
264 "minor: %d, blocksize: %ld, blocksize bits %ld\n",
265 sb->s_dev, root->i_ino, device, MINOR(devno),
266 blocksize, blocksize_bits);
267 sb->s_root = d_alloc_root(root);
268 list_add(&sbi->osi_list, &obdfs_super_list);
269 OBD_FREE(device, strlen(device) + 1);
271 OBD_FREE(version, strlen(version) + 1);
278 OBD_FREE(device, strlen(device) + 1);
280 OBD_FREE(version, strlen(version) + 1);
282 sbi->osi_ops->o_disconnect(&sbi->osi_conn);
285 sbi->osi_super = NULL;
292 } /* obdfs_read_super */
295 static void obdfs_put_super(struct super_block *sb)
297 struct obdfs_sb_info *sbi;
302 sbi = (struct obdfs_sb_info *) &sb->u.generic_sbp;
303 //obdfs_flush_reqs(&sbi->osi_inodes, ~0UL);
305 OPS(sb,disconnect)(ID(sb));
306 list_del(&sbi->osi_list);
308 printk(KERN_INFO "OBDFS: Bye bye.\n");
312 } /* obdfs_put_super */
315 void obdfs_do_change_inode(struct inode *inode, int valid)
321 if (IOPS(inode, setattr) == NULL) {
322 printk(KERN_ERR __FUNCTION__ ": no setattr method!\n");
328 printk(__FUNCTION__ ": obdo_alloc failed\n");
333 oa->o_valid = OBD_MD_FLNOTOBD & (valid | OBD_MD_FLID);
334 obdfs_from_inode(oa, inode);
335 oa->o_mode = inode->i_mode;
336 err = IOPS(inode, setattr)(IID(inode), oa);
339 printk(__FUNCTION__ ": obd_setattr fails (%d)\n", err);
343 } /* obdfs_write_inode */
345 void obdfs_change_inode(struct inode *inode, int mask)
347 return obdfs_do_change_inode(inode, OBD_MD_FLNLINK);
351 extern void write_inode_pages(struct inode *);
352 /* This routine is called from iput() (for each unlink on the inode).
353 * We can't put this call into delete_inode() since that is called only
354 * when i_count == 0, and we need to keep a reference on the inode while
355 * it is in the page cache, which means i_count > 0. Catch 22.
357 static void obdfs_put_inode(struct inode *inode)
360 if (inode->i_nlink && (atomic_read(&inode->i_count) == 1)) {
361 write_inode_pages(inode);
366 //obdfs_dequeue_pages(inode);
368 } /* obdfs_put_inode */
371 static void obdfs_delete_inode(struct inode *inode)
373 obdfs_do_change_inode(inode, ~0);
382 if (IOPS(inode, destroy) == NULL) {
383 printk(KERN_ERR __FUNCTION__ ": no destroy method!\n");
390 printk(__FUNCTION__ ": obdo_alloc failed\n");
394 oa->o_valid = OBD_MD_FLNOTOBD;
395 obdfs_from_inode(oa, inode);
397 /* XXX how do we know that this inode is now clean? */
398 printk("delete_inode ------> link %d\n", inode->i_nlink);
400 err = IOPS(inode, destroy)(IID(inode), oa);
404 printk(__FUNCTION__ ": obd_destroy fails (%d)\n", err);
410 } /* obdfs_delete_inode */
414 static int obdfs_attr2inode(struct inode * inode, struct iattr * attr)
416 unsigned int ia_valid = attr->ia_valid;
419 if (ia_valid & ATTR_SIZE) {
420 error = vmtruncate(inode, attr->ia_size);
425 if (ia_valid & ATTR_UID)
426 inode->i_uid = attr->ia_uid;
427 if (ia_valid & ATTR_GID)
428 inode->i_gid = attr->ia_gid;
429 if (ia_valid & ATTR_ATIME)
430 inode->i_atime = attr->ia_atime;
431 if (ia_valid & ATTR_MTIME)
432 inode->i_mtime = attr->ia_mtime;
433 if (ia_valid & ATTR_CTIME)
434 inode->i_ctime = attr->ia_ctime;
435 if (ia_valid & ATTR_MODE) {
436 inode->i_mode = attr->ia_mode;
437 if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID))
438 inode->i_mode &= ~S_ISGID;
444 int obdfs_setattr(struct dentry *de, struct iattr *attr)
446 struct inode *inode = de->d_inode;
451 if (IOPS(inode, setattr) == NULL) {
452 printk(KERN_ERR __FUNCTION__ ": no setattr method!\n");
458 printk(__FUNCTION__ ": obdo_alloc failed\n");
462 obdfs_attr2inode(inode, attr);
463 oa->o_id = inode->i_ino;
464 oa->o_mode = inode->i_mode;
465 obdo_from_iattr(oa, attr);
466 err = IOPS(inode, setattr)(IID(inode), oa);
469 printk(__FUNCTION__ ": obd_setattr fails (%d)\n", err);
474 } /* obdfs_setattr */
478 static int obdfs_statfs(struct super_block *sb, struct statfs *buf)
485 err = OPS(sb,statfs)(ID(sb), &tmp);
487 printk(__FUNCTION__ ": obd_statfs fails (%d)\n", err);
490 memcpy(buf, &tmp, sizeof(*buf));
491 CDEBUG(D_SUPER, "statfs returns avail %ld\n", tmp.f_bavail);
497 static inline void obdfs_read_inode2(struct inode *inode, void *opaque)
499 struct obdo *oa = opaque;
502 obdfs_to_inode(inode, oa);
504 INIT_LIST_HEAD(obdfs_iplist(inode)); /* list of dirty pages on inode */
505 INIT_LIST_HEAD(obdfs_islist(inode)); /* list of inodes in superblock */
507 /* OIDEBUG(inode); */
509 if (S_ISREG(inode->i_mode)) {
510 inode->i_op = &obdfs_file_inode_operations;
511 inode->i_fop = &obdfs_file_operations;
512 inode->i_mapping->a_ops = &obdfs_aops;
514 } else if (S_ISDIR(inode->i_mode)) {
515 inode->i_op = &obdfs_dir_inode_operations;
516 inode->i_fop = &obdfs_dir_operations;
517 inode->i_mapping->a_ops = &obdfs_aops;
519 } else if (S_ISLNK(inode->i_mode)) {
520 if (inode->i_blocks) {
521 inode->i_op = &obdfs_symlink_inode_operations;
522 inode->i_mapping->a_ops = &obdfs_aops;
524 inode->i_op = &obdfs_fast_symlink_inode_operations;
528 init_special_inode(inode, inode->i_mode,
529 ((int *)obdfs_i2info(inode)->oi_inline)[0]);
536 /* exported operations */
537 struct super_operations obdfs_super_operations =
539 read_inode2: obdfs_read_inode2,
540 put_inode: obdfs_put_inode,
541 delete_inode: obdfs_delete_inode,
542 put_super: obdfs_put_super,
547 struct file_system_type obdfs_fs_type = {
548 "obdfs", 0, obdfs_read_super, NULL
555 printk(KERN_INFO "OBDFS v0.1, braam@stelias.com\n");
559 INIT_LIST_HEAD(&obdfs_super_list);
560 //err = obdfs_init_pgrqcache();
564 //obdfs_flushd_init();
565 return register_filesystem(&obdfs_fs_type);
572 int init_module(void)
577 void cleanup_module(void)
581 //obdfs_flushd_cleanup();
582 obdfs_sysctl_clean();
583 //obdfs_cleanup_pgrqcache();
584 unregister_filesystem(&obdfs_fs_type);
585 CDEBUG(D_MALLOC, "OBDFS mem used %ld\n", obd_memory);