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.
12 * Copryright (C) 2002 Cluster File Systems, 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 extern 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 struct super_block * obdfs_read_super(struct super_block *sb,
89 void *data, int silent)
91 struct inode *root = 0;
92 struct obdfs_sb_info *sbi = (struct obdfs_sb_info *)(&sb->u.generic_sbp);
93 struct obd_device *obddev;
99 unsigned long blocksize;
100 unsigned long blocksize_bits;
101 unsigned long root_ino;
109 memset(sbi, 0, sizeof(*sbi));
111 CDEBUG(D_INFO, "\n");
112 obdfs_options(data, &device, &version);
114 printk(__FUNCTION__ ": no device\n");
119 devno = simple_strtoul(device, NULL, 0);
120 CDEBUG(D_INFO, "\n");
121 if ( devno >= MAX_OBD_DEVICES ) {
122 printk(__FUNCTION__ ": device of %s too high (%d)\n", device, devno);
127 CDEBUG(D_INFO, "\n");
129 obddev = &obd_dev[devno];
130 sbi->osi_obd = obddev;
131 sbi->osi_conn.oc_dev = obddev;
133 err = obd_connect(&sbi->osi_conn);
135 printk("OBDFS: cannot connect to %s\n", device);
141 CDEBUG(D_INFO, "\n");
142 /* list of dirty inodes, and a mutex to hold while modifying it */
143 INIT_LIST_HEAD(&sbi->osi_inodes);
144 init_MUTEX (&sbi->osi_list_mutex);
146 CDEBUG(D_INFO, "\n");
149 CDEBUG(D_INFO, "\n");
150 err = obd_get_info(&sbi->osi_conn, strlen("blocksize"),
151 "blocksize", &scratch,
154 printk("getinfo call to drive failed (blocksize)\n");
159 CDEBUG(D_INFO, "\n");
160 err = obd_get_info(&sbi->osi_conn, strlen("blocksize_bits"),
161 "blocksize_bits", &scratch,
162 (void *)&blocksize_bits);
164 printk("getinfo call to drive failed (blocksize_bits)\n");
169 CDEBUG(D_INFO, "\n");
170 err = obd_get_info(&sbi->osi_conn, strlen("root_ino"),
171 "root_ino", &scratch, (void *)&root_ino);
173 printk("getinfo call to drive failed (root_ino)\n");
178 CDEBUG(D_INFO, "\n");
179 sb->s_maxbytes = 1LL << 36;
180 printk("Max bytes: %Lx\n", sb->s_maxbytes);
181 sb->s_blocksize = PAGE_SIZE;
182 sb->s_blocksize_bits = (unsigned char)PAGE_SHIFT;
183 sb->s_magic = OBDFS_SUPER_MAGIC;
184 sb->s_op = &obdfs_super_operations;
186 /* XXX how to get "sb->s_flags |= MS_RDONLY" here for snapshots? */
188 /* make root inode */
189 CDEBUG(D_INFO, "\n");
190 oa = obdo_fromid(&sbi->osi_conn, root_ino, S_IFDIR,
191 OBD_MD_FLNOTOBD | OBD_MD_FLBLOCKS);
192 CDEBUG(D_INFO, "mode %o\n", oa->o_mode);
194 printk(__FUNCTION__ ": obdo_fromid failed\n");
199 CDEBUG(D_INFO, "\n");
200 root = iget4(sb, root_ino, NULL, oa);
202 CDEBUG(D_INFO, "\n");
204 printk("OBDFS: bad iget4 for root\n");
211 CDEBUG(D_INFO, "obdfs_read_super: sbdev %d, rootino: %ld, dev %s, "
212 "minor: %d, blocksize: %ld, blocksize bits %ld\n",
213 sb->s_dev, root->i_ino, device, MINOR(devno),
214 blocksize, blocksize_bits);
215 sb->s_root = d_alloc_root(root);
216 list_add(&sbi->osi_list, &obdfs_super_list);
217 OBD_FREE(device, strlen(device) + 1);
219 OBD_FREE(version, strlen(version) + 1);
226 OBD_FREE(device, strlen(device) + 1);
228 OBD_FREE(version, strlen(version) + 1);
230 obd_disconnect(&sbi->osi_conn);
233 sbi->osi_super = NULL;
240 } /* obdfs_read_super */
243 static void obdfs_put_super(struct super_block *sb)
245 struct obdfs_sb_info *sbi;
250 sbi = (struct obdfs_sb_info *) &sb->u.generic_sbp;
251 //obdfs_flush_reqs(&sbi->osi_inodes, ~0UL);
253 obd_disconnect(ID(sb));
254 list_del(&sbi->osi_list);
256 printk(KERN_INFO "OBDFS: Bye bye.\n");
260 } /* obdfs_put_super */
263 void obdfs_do_change_inode(struct inode *inode, int valid)
271 printk(__FUNCTION__ ": obdo_alloc failed\n");
276 oa->o_valid = OBD_MD_FLNOTOBD & (valid | OBD_MD_FLID);
277 obdfs_from_inode(oa, inode);
278 oa->o_mode = inode->i_mode;
279 err = obd_setattr(IID(inode), oa);
282 printk(__FUNCTION__ ": obd_setattr fails (%d)\n", err);
286 } /* obdfs_write_inode */
288 void obdfs_change_inode(struct inode *inode, int mask)
290 return obdfs_do_change_inode(inode, OBD_MD_FLNLINK);
294 extern void write_inode_pages(struct inode *);
295 /* This routine is called from iput() (for each unlink on the inode).
296 * We can't put this call into delete_inode() since that is called only
297 * when i_count == 0, and we need to keep a reference on the inode while
298 * it is in the page cache, which means i_count > 0. Catch 22.
300 static void obdfs_put_inode(struct inode *inode)
303 if (inode->i_nlink && (atomic_read(&inode->i_count) == 1)) {
304 write_inode_pages(inode);
309 //obdfs_dequeue_pages(inode);
311 } /* obdfs_put_inode */
314 static void obdfs_delete_inode(struct inode *inode)
316 obdfs_do_change_inode(inode, ~0);
327 printk(__FUNCTION__ ": obdo_alloc failed\n");
331 oa->o_valid = OBD_MD_FLNOTOBD;
332 obdfs_from_inode(oa, inode);
334 /* XXX how do we know that this inode is now clean? */
335 printk("delete_inode ------> link %d\n", inode->i_nlink);
337 err = obd_destroy(IID(inode), oa);
341 printk(__FUNCTION__ ": obd_destroy fails (%d)\n", err);
347 } /* obdfs_delete_inode */
351 static int obdfs_attr2inode(struct inode * inode, struct iattr * attr)
353 unsigned int ia_valid = attr->ia_valid;
356 if (ia_valid & ATTR_SIZE) {
357 error = vmtruncate(inode, attr->ia_size);
362 if (ia_valid & ATTR_UID)
363 inode->i_uid = attr->ia_uid;
364 if (ia_valid & ATTR_GID)
365 inode->i_gid = attr->ia_gid;
366 if (ia_valid & ATTR_ATIME)
367 inode->i_atime = attr->ia_atime;
368 if (ia_valid & ATTR_MTIME)
369 inode->i_mtime = attr->ia_mtime;
370 if (ia_valid & ATTR_CTIME)
371 inode->i_ctime = attr->ia_ctime;
372 if (ia_valid & ATTR_MODE) {
373 inode->i_mode = attr->ia_mode;
374 if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID))
375 inode->i_mode &= ~S_ISGID;
381 int obdfs_setattr(struct dentry *de, struct iattr *attr)
383 struct inode *inode = de->d_inode;
390 printk(__FUNCTION__ ": obdo_alloc failed\n");
394 obdfs_attr2inode(inode, attr);
395 oa->o_id = inode->i_ino;
396 oa->o_mode = inode->i_mode;
397 obdo_from_iattr(oa, attr);
398 err = obd_setattr(IID(inode), oa);
401 printk(__FUNCTION__ ": obd_setattr fails (%d)\n", err);
406 } /* obdfs_setattr */
410 static int obdfs_statfs(struct super_block *sb, struct statfs *buf)
417 err = obd_statfs(ID(sb), &tmp);
419 printk(__FUNCTION__ ": obd_statfs fails (%d)\n", err);
422 memcpy(buf, &tmp, sizeof(*buf));
423 CDEBUG(D_SUPER, "statfs returns avail %ld\n", tmp.f_bavail);
429 static inline void obdfs_read_inode2(struct inode *inode, void *opaque)
431 struct obdo *oa = opaque;
434 obdfs_to_inode(inode, oa);
436 INIT_LIST_HEAD(obdfs_iplist(inode)); /* list of dirty pages on inode */
437 INIT_LIST_HEAD(obdfs_islist(inode)); /* list of inodes in superblock */
439 /* OIDEBUG(inode); */
441 if (S_ISREG(inode->i_mode)) {
442 inode->i_op = &obdfs_file_inode_operations;
443 inode->i_fop = &obdfs_file_operations;
444 inode->i_mapping->a_ops = &obdfs_aops;
446 } else if (S_ISDIR(inode->i_mode)) {
447 inode->i_op = &obdfs_dir_inode_operations;
448 inode->i_fop = &obdfs_dir_operations;
449 inode->i_mapping->a_ops = &obdfs_aops;
451 } else if (S_ISLNK(inode->i_mode)) {
452 if (inode->i_blocks) {
453 inode->i_op = &obdfs_symlink_inode_operations;
454 inode->i_mapping->a_ops = &obdfs_aops;
456 inode->i_op = &obdfs_fast_symlink_inode_operations;
460 init_special_inode(inode, inode->i_mode,
461 ((int *)obdfs_i2info(inode)->oi_inline)[0]);
468 /* exported operations */
469 struct super_operations obdfs_super_operations =
471 read_inode2: obdfs_read_inode2,
472 put_inode: obdfs_put_inode,
473 delete_inode: obdfs_delete_inode,
474 put_super: obdfs_put_super,
479 struct file_system_type obdfs_fs_type = {
480 "obdfs", 0, obdfs_read_super, NULL
487 printk(KERN_INFO "OBDFS v0.1, braam@stelias.com\n");
491 INIT_LIST_HEAD(&obdfs_super_list);
492 //err = obdfs_init_pgrqcache();
496 //obdfs_flushd_init();
497 return register_filesystem(&obdfs_fs_type);
504 int init_module(void)
509 void cleanup_module(void)
513 //obdfs_flushd_cleanup();
514 obdfs_sysctl_clean();
515 //obdfs_cleanup_pgrqcache();
516 unregister_filesystem(&obdfs_fs_type);
517 CDEBUG(D_MALLOC, "OBDFS mem used %ld\n", obd_memory);