2 * OBDFS Super operations
4 * This code is issued under the GNU General Public License.
5 * See the file COPYING in this distribution
7 * Copryright (C) 1996 Peter J. Braam <braam@stelias.com>
8 * Copryright (C) 1999 Stelias Computing Inc. <braam@stelias.com>
9 * Copryright (C) 1999 Seagate Technology Inc.
10 * Copryright (C) 2001 Mountain View Data, Inc.
16 #include <linux/config.h>
17 #include <linux/module.h>
18 #include <linux/kernel.h>
20 #include <linux/string.h>
21 #include <linux/stat.h>
22 #include <linux/errno.h>
23 #include <linux/locks.h>
24 #include <linux/unistd.h>
26 #include <asm/system.h>
27 #include <asm/uaccess.h>
30 #include <linux/stat.h>
31 #include <asm/uaccess.h>
32 #include <linux/vmalloc.h>
33 #include <asm/segment.h>
35 #include <linux/obd_support.h>
36 #include <linux/obd_class.h>
37 #include <linux/obdfs.h>
39 struct list_head obdfs_super_list;
40 struct address_space_operations obdfs_aops;
41 struct super_operations obdfs_super_operations;
42 long obdfs_cache_count = 0;
43 long obdfs_mutex_start = 0;
46 static char *obdfs_read_opt(const char *opt, char *data)
51 CDEBUG(D_INFO, "option: %s, data %s\n", opt, data);
52 if ( strncmp(opt, data, strlen(opt)) )
55 if ( (value = strchr(data, '=')) == NULL )
59 OBD_ALLOC(retval, char *, strlen(value) + 1);
61 printk(KERN_ALERT __FUNCTION__ ": out of memory!\n");
65 memcpy(retval, value, strlen(value)+1);
66 CDEBUG(D_PSDEV, "Assigned option: %s, value %s\n", opt, retval);
70 static void obdfs_options(char *options, char **dev, char **vers)
77 for (this_char = strtok (options, ",");
79 this_char = strtok (NULL, ",")) {
80 CDEBUG(D_INFO, "this_char %s\n", this_char);
81 if ( (!*dev && (*dev = obdfs_read_opt("device", this_char)))||
82 (!*vers && (*vers = obdfs_read_opt("version", this_char))) )
88 static int obdfs_getdev(char *devpath, int *dev)
90 struct dentry *dentry;
96 if (path_init(devpath, LOOKUP_POSITIVE, &nd))
97 error = path_walk(devpath, &nd);
102 if (!S_ISCHR(dentry->d_inode->i_mode))
105 devno = dentry->d_inode->i_rdev;
106 if ( MAJOR(devno) != OBD_PSDEV_MAJOR )
109 if ( MINOR(devno) >= MAX_OBD_DEVICES )
117 static struct super_block * obdfs_read_super(struct super_block *sb,
118 void *data, int silent)
120 struct inode *root = 0;
121 struct obdfs_sb_info *sbi = (struct obdfs_sb_info *)(&sb->u.generic_sbp);
122 struct obd_device *obddev;
124 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_blocksize = blocksize;
232 sb->s_blocksize_bits = (unsigned char)blocksize_bits;
233 sb->s_magic = OBDFS_SUPER_MAGIC;
234 sb->s_op = &obdfs_super_operations;
236 /* XXX how to get "sb->s_flags |= MS_RDONLY" here for snapshots? */
238 /* make root inode */
239 CDEBUG(D_INFO, "\n");
240 oa = obdo_fromid(&sbi->osi_conn, root_ino,
241 OBD_MD_FLNOTOBD | OBD_MD_FLBLOCKS);
242 CDEBUG(D_INFO, "\n");
244 printk(__FUNCTION__ ": obdo_fromid failed\n");
249 CDEBUG(D_INFO, "\n");
250 root = iget4(sb, root_ino, NULL, oa);
252 CDEBUG(D_INFO, "\n");
254 printk("OBDFS: bad iget4 for root\n");
261 CDEBUG(D_INFO, "obdfs_read_super: sbdev %d, rootino: %ld, dev %s, "
262 "minor: %d, blocksize: %ld, blocksize bits %ld\n",
263 sb->s_dev, root->i_ino, device, MINOR(devno),
264 blocksize, blocksize_bits);
265 sb->s_root = d_alloc_root(root);
266 list_add(&sbi->osi_list, &obdfs_super_list);
267 OBD_FREE(device, strlen(device) + 1);
269 OBD_FREE(version, strlen(version) + 1);
276 OBD_FREE(device, strlen(device) + 1);
278 OBD_FREE(version, strlen(version) + 1);
280 sbi->osi_super = NULL;
287 } /* obdfs_read_super */
290 static void obdfs_put_super(struct super_block *sb)
292 struct obdfs_sb_info *sbi;
297 sbi = (struct obdfs_sb_info *) &sb->u.generic_sbp;
298 obdfs_flush_reqs(&sbi->osi_inodes, ~0UL);
300 OPS(sb,disconnect)(ID(sb));
301 list_del(&sbi->osi_list);
303 printk(KERN_INFO "OBDFS: Bye bye.\n");
307 } /* obdfs_put_super */
310 void obdfs_do_change_inode(struct inode *inode, int mask)
316 if (IOPS(inode, setattr) == NULL) {
317 printk(KERN_ERR __FUNCTION__ ": no setattr method!\n");
323 printk(__FUNCTION__ ": obdo_alloc failed\n");
328 oa->o_valid = OBD_MD_FLNOTOBD & (~mask);
329 obdfs_from_inode(oa, inode);
330 err = IOPS(inode, setattr)(IID(inode), oa);
333 printk(__FUNCTION__ ": obd_setattr fails (%d)\n", err);
337 } /* obdfs_write_inode */
339 void obdfs_change_inode(struct inode *inode, int mask)
341 return obdfs_do_change_inode(inode, OBD_MD_FLNLINK);
346 /* This routine is called from iput() (for each unlink on the inode).
347 * We can't put this call into delete_inode() since that is called only
348 * when i_count == 0, and we need to keep a reference on the inode while
349 * it is in the page cache, which means i_count > 0. Catch 22.
351 static void obdfs_put_inode(struct inode *inode)
354 if (inode->i_nlink) {
359 obdfs_dequeue_pages(inode);
361 } /* obdfs_put_inode */
364 static void obdfs_delete_inode(struct inode *inode)
366 obdfs_do_change_inode(inode, 0);
375 if (IOPS(inode, destroy) == NULL) {
376 printk(KERN_ERR __FUNCTION__ ": no destroy method!\n");
383 printk(__FUNCTION__ ": obdo_alloc failed\n");
387 oa->o_valid = OBD_MD_FLNOTOBD;
388 obdfs_from_inode(oa, inode);
390 /* XXX how do we know that this inode is now clean? */
391 printk("delete_inode ------> link %d\n", inode->i_nlink);
393 err = IOPS(inode, destroy)(IID(inode), oa);
397 printk(__FUNCTION__ ": obd_destroy fails (%d)\n", err);
403 } /* obdfs_delete_inode */
407 int inode_copy_attr(struct inode * inode, struct iattr * attr)
409 unsigned int ia_valid = attr->ia_valid;
412 if (ia_valid & ATTR_SIZE) {
413 error = vmtruncate(inode, attr->ia_size);
418 if (ia_valid & ATTR_UID)
419 inode->i_uid = attr->ia_uid;
420 if (ia_valid & ATTR_GID)
421 inode->i_gid = attr->ia_gid;
422 if (ia_valid & ATTR_ATIME)
423 inode->i_atime = attr->ia_atime;
424 if (ia_valid & ATTR_MTIME)
425 inode->i_mtime = attr->ia_mtime;
426 if (ia_valid & ATTR_CTIME)
427 inode->i_ctime = attr->ia_ctime;
428 if (ia_valid & ATTR_MODE) {
429 inode->i_mode = attr->ia_mode;
430 if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID))
431 inode->i_mode &= ~S_ISGID;
437 int obdfs_setattr(struct dentry *de, struct iattr *attr)
439 struct inode *inode = de->d_inode;
444 if (IOPS(inode, setattr) == NULL) {
445 printk(KERN_ERR __FUNCTION__ ": no setattr method!\n");
451 printk(__FUNCTION__ ": obdo_alloc failed\n");
455 inode_copy_attr(inode, attr);
456 oa->o_id = inode->i_ino;
457 obdo_from_iattr(oa, attr);
458 err = IOPS(inode, setattr)(IID(inode), oa);
461 printk(__FUNCTION__ ": obd_setattr fails (%d)\n", err);
466 } /* obdfs_setattr */
470 static int obdfs_statfs(struct super_block *sb, struct statfs *buf)
477 err = OPS(sb,statfs)(ID(sb), &tmp);
479 printk(__FUNCTION__ ": obd_statfs fails (%d)\n", err);
482 memcpy(buf, &tmp, sizeof(*buf));
483 CDEBUG(D_SUPER, "statfs returns avail %ld\n", tmp.f_bavail);
489 static inline void obdfs_read_inode2(struct inode *inode, void *opaque)
491 struct obdo *oa = opaque;
494 obdfs_to_inode(inode, oa);
496 INIT_LIST_HEAD(obdfs_iplist(inode)); /* list of dirty pages on inode */
497 INIT_LIST_HEAD(obdfs_islist(inode)); /* list of inodes in superblock */
499 /* OIDEBUG(inode); */
501 if (S_ISREG(inode->i_mode)) {
502 inode->i_op = &obdfs_file_inode_operations;
503 inode->i_fop = &obdfs_file_operations;
504 inode->i_mapping->a_ops = &obdfs_aops;
506 } else if (S_ISDIR(inode->i_mode)) {
507 inode->i_op = &obdfs_dir_inode_operations;
508 inode->i_fop = &obdfs_dir_operations;
509 inode->i_mapping->a_ops = &obdfs_aops;
511 } else if (S_ISLNK(inode->i_mode)) {
512 if (inode->i_blocks) {
513 inode->i_op = &obdfs_symlink_inode_operations;
514 inode->i_mapping->a_ops = &obdfs_aops;
516 inode->i_op = &obdfs_fast_symlink_inode_operations;
520 init_special_inode(inode, inode->i_mode,
521 ((int *)obdfs_i2info(inode)->oi_inline)[0]);
528 /* exported operations */
529 struct super_operations obdfs_super_operations =
531 read_inode2: obdfs_read_inode2,
532 put_inode: obdfs_put_inode,
533 delete_inode: obdfs_delete_inode,
534 put_super: obdfs_put_super,
539 struct file_system_type obdfs_fs_type = {
540 "obdfs", 0, obdfs_read_super, NULL
547 printk(KERN_INFO "OBDFS v0.1, braam@stelias.com\n");
551 INIT_LIST_HEAD(&obdfs_super_list);
552 err = obdfs_init_pgrqcache();
557 return register_filesystem(&obdfs_fs_type);
561 struct address_space_operations obdfs_aops = {
562 readpage: obdfs_readpage,
563 writepage: obdfs_writepage,
564 sync_page: block_sync_page,
565 prepare_write: obdfs_prepare_write,
566 commit_write: obdfs_commit_write,
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);