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 #define DEBUG_SUBSYSTEM S_OBDFS
37 #include <linux/obd_support.h>
38 #include <linux/obd_class.h>
39 #include <linux/obdfs.h>
41 struct list_head obdfs_super_list;
42 extern struct address_space_operations obdfs_aops;
43 struct super_operations obdfs_super_operations;
44 long obdfs_cache_count = 0;
45 long obdfs_mutex_start = 0;
48 static char *obdfs_read_opt(const char *opt, char *data)
53 CDEBUG(D_INFO, "option: %s, data %s\n", opt, data);
54 if ( strncmp(opt, data, strlen(opt)) )
57 if ( (value = strchr(data, '=')) == NULL )
61 OBD_ALLOC(retval, strlen(value) + 1);
63 printk(KERN_ALERT __FUNCTION__ ": out of memory!\n");
67 memcpy(retval, value, strlen(value)+1);
68 CDEBUG(D_SUPER, "Assigned option: %s, value %s\n", opt, retval);
72 static void obdfs_options(char *options, char **dev, char **vers)
79 for (this_char = strtok (options, ",");
81 this_char = strtok (NULL, ",")) {
82 CDEBUG(D_INFO, "this_char %s\n", this_char);
83 if ( (!*dev && (*dev = obdfs_read_opt("device", this_char)))||
84 (!*vers && (*vers = obdfs_read_opt("version", this_char))) )
90 static struct super_block * obdfs_read_super(struct super_block *sb,
91 void *data, int silent)
93 struct inode *root = 0;
94 struct obdfs_sb_info *sbi = (struct obdfs_sb_info *)(&sb->u.generic_sbp);
95 struct obd_device *obddev;
101 unsigned long blocksize;
102 unsigned long blocksize_bits;
103 unsigned long root_ino;
111 memset(sbi, 0, sizeof(*sbi));
113 CDEBUG(D_INFO, "\n");
114 obdfs_options(data, &device, &version);
116 printk(__FUNCTION__ ": no device\n");
121 devno = simple_strtoul(device, NULL, 0);
122 CDEBUG(D_INFO, "\n");
123 if ( devno >= MAX_OBD_DEVICES ) {
124 printk(__FUNCTION__ ": device of %s too high (%d)\n", device, devno);
129 CDEBUG(D_INFO, "\n");
131 obddev = &obd_dev[devno];
132 sbi->osi_obd = obddev;
133 sbi->osi_conn.oc_dev = obddev;
135 err = obd_connect(&sbi->osi_conn);
137 printk("OBDFS: cannot connect to %s\n", device);
143 CDEBUG(D_INFO, "\n");
144 /* list of dirty inodes, and a mutex to hold while modifying it */
145 INIT_LIST_HEAD(&sbi->osi_inodes);
146 init_MUTEX (&sbi->osi_list_mutex);
148 CDEBUG(D_INFO, "\n");
151 CDEBUG(D_INFO, "\n");
152 err = obd_get_info(&sbi->osi_conn, strlen("blocksize"),
153 "blocksize", &scratch,
156 printk("getinfo call to drive failed (blocksize)\n");
161 CDEBUG(D_INFO, "\n");
162 err = obd_get_info(&sbi->osi_conn, strlen("blocksize_bits"),
163 "blocksize_bits", &scratch,
164 (void *)&blocksize_bits);
166 printk("getinfo call to drive failed (blocksize_bits)\n");
171 CDEBUG(D_INFO, "\n");
172 err = obd_get_info(&sbi->osi_conn, strlen("root_ino"),
173 "root_ino", &scratch, (void *)&root_ino);
175 printk("getinfo call to drive failed (root_ino)\n");
180 CDEBUG(D_INFO, "\n");
181 sb->s_maxbytes = 1LL << 36;
182 printk("Max bytes: %Lx\n", sb->s_maxbytes);
183 sb->s_blocksize = PAGE_SIZE;
184 sb->s_blocksize_bits = (unsigned char)PAGE_SHIFT;
185 sb->s_magic = OBDFS_SUPER_MAGIC;
186 sb->s_op = &obdfs_super_operations;
188 /* XXX how to get "sb->s_flags |= MS_RDONLY" here for snapshots? */
190 /* make root inode */
191 CDEBUG(D_INFO, "\n");
192 oa = obdo_fromid(&sbi->osi_conn, root_ino, S_IFDIR,
193 OBD_MD_FLNOTOBD | OBD_MD_FLBLOCKS);
194 CDEBUG(D_INFO, "mode %o\n", oa->o_mode);
196 printk(__FUNCTION__ ": obdo_fromid failed\n");
201 CDEBUG(D_INFO, "\n");
202 root = iget4(sb, root_ino, NULL, oa);
204 CDEBUG(D_INFO, "\n");
206 printk("OBDFS: bad iget4 for root\n");
213 CDEBUG(D_INFO, "obdfs_read_super: sbdev %d, rootino: %ld, dev %s, "
214 "minor: %d, blocksize: %ld, blocksize bits %ld\n",
215 sb->s_dev, root->i_ino, device, MINOR(devno),
216 blocksize, blocksize_bits);
217 sb->s_root = d_alloc_root(root);
218 list_add(&sbi->osi_list, &obdfs_super_list);
219 OBD_FREE(device, strlen(device) + 1);
221 OBD_FREE(version, strlen(version) + 1);
228 OBD_FREE(device, strlen(device) + 1);
230 OBD_FREE(version, strlen(version) + 1);
232 obd_disconnect(&sbi->osi_conn);
235 sbi->osi_super = NULL;
242 } /* obdfs_read_super */
245 static void obdfs_put_super(struct super_block *sb)
247 struct obdfs_sb_info *sbi;
252 sbi = (struct obdfs_sb_info *) &sb->u.generic_sbp;
253 //obdfs_flush_reqs(&sbi->osi_inodes, ~0UL);
255 obd_disconnect(ID(sb));
256 list_del(&sbi->osi_list);
258 printk(KERN_INFO "OBDFS: Bye bye.\n");
262 } /* obdfs_put_super */
265 void obdfs_do_change_inode(struct inode *inode, int valid)
273 printk(__FUNCTION__ ": obdo_alloc failed\n");
278 oa->o_valid = OBD_MD_FLNOTOBD & (valid | OBD_MD_FLID);
279 obdfs_from_inode(oa, inode);
280 oa->o_mode = inode->i_mode;
281 err = obd_setattr(IID(inode), oa);
284 printk(__FUNCTION__ ": obd_setattr fails (%d)\n", err);
288 } /* obdfs_write_inode */
290 void obdfs_change_inode(struct inode *inode, int mask)
292 return obdfs_do_change_inode(inode, OBD_MD_FLNLINK);
296 extern void write_inode_pages(struct inode *);
297 /* This routine is called from iput() (for each unlink on the inode).
298 * We can't put this call into delete_inode() since that is called only
299 * when i_count == 0, and we need to keep a reference on the inode while
300 * it is in the page cache, which means i_count > 0. Catch 22.
302 static void obdfs_put_inode(struct inode *inode)
305 if (inode->i_nlink && (atomic_read(&inode->i_count) == 1)) {
306 write_inode_pages(inode);
311 //obdfs_dequeue_pages(inode);
313 } /* obdfs_put_inode */
316 static void obdfs_delete_inode(struct inode *inode)
318 obdfs_do_change_inode(inode, ~0);
329 printk(__FUNCTION__ ": obdo_alloc failed\n");
333 oa->o_valid = OBD_MD_FLNOTOBD;
334 obdfs_from_inode(oa, inode);
336 /* XXX how do we know that this inode is now clean? */
337 printk("delete_inode ------> link %d\n", inode->i_nlink);
339 err = obd_destroy(IID(inode), oa);
343 printk(__FUNCTION__ ": obd_destroy fails (%d)\n", err);
349 } /* obdfs_delete_inode */
353 static int obdfs_attr2inode(struct inode * inode, struct iattr * attr)
355 unsigned int ia_valid = attr->ia_valid;
358 if (ia_valid & ATTR_SIZE) {
359 error = vmtruncate(inode, attr->ia_size);
364 if (ia_valid & ATTR_UID)
365 inode->i_uid = attr->ia_uid;
366 if (ia_valid & ATTR_GID)
367 inode->i_gid = attr->ia_gid;
368 if (ia_valid & ATTR_ATIME)
369 inode->i_atime = attr->ia_atime;
370 if (ia_valid & ATTR_MTIME)
371 inode->i_mtime = attr->ia_mtime;
372 if (ia_valid & ATTR_CTIME)
373 inode->i_ctime = attr->ia_ctime;
374 if (ia_valid & ATTR_MODE) {
375 inode->i_mode = attr->ia_mode;
376 if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID))
377 inode->i_mode &= ~S_ISGID;
383 int obdfs_setattr(struct dentry *de, struct iattr *attr)
385 struct inode *inode = de->d_inode;
392 printk(__FUNCTION__ ": obdo_alloc failed\n");
396 obdfs_attr2inode(inode, attr);
397 oa->o_id = inode->i_ino;
398 oa->o_mode = inode->i_mode;
399 obdo_from_iattr(oa, attr);
400 err = obd_setattr(IID(inode), oa);
403 printk(__FUNCTION__ ": obd_setattr fails (%d)\n", err);
408 } /* obdfs_setattr */
412 static int obdfs_statfs(struct super_block *sb, struct statfs *buf)
419 err = obd_statfs(ID(sb), &tmp);
421 printk(__FUNCTION__ ": obd_statfs fails (%d)\n", err);
424 memcpy(buf, &tmp, sizeof(*buf));
425 CDEBUG(D_SUPER, "statfs returns avail %ld\n", tmp.f_bavail);
431 static inline void obdfs_read_inode2(struct inode *inode, void *opaque)
433 struct obdo *oa = opaque;
436 obdfs_to_inode(inode, oa);
438 INIT_LIST_HEAD(obdfs_iplist(inode)); /* list of dirty pages on inode */
439 INIT_LIST_HEAD(obdfs_islist(inode)); /* list of inodes in superblock */
441 /* OIDEBUG(inode); */
443 if (S_ISREG(inode->i_mode)) {
444 inode->i_op = &obdfs_file_inode_operations;
445 inode->i_fop = &obdfs_file_operations;
446 inode->i_mapping->a_ops = &obdfs_aops;
448 } else if (S_ISDIR(inode->i_mode)) {
449 inode->i_op = &obdfs_dir_inode_operations;
450 inode->i_fop = &obdfs_dir_operations;
451 inode->i_mapping->a_ops = &obdfs_aops;
453 } else if (S_ISLNK(inode->i_mode)) {
454 if (inode->i_blocks) {
455 inode->i_op = &obdfs_symlink_inode_operations;
456 inode->i_mapping->a_ops = &obdfs_aops;
458 inode->i_op = &obdfs_fast_symlink_inode_operations;
462 init_special_inode(inode, inode->i_mode,
463 ((int *)obdfs_i2info(inode)->oi_inline)[0]);
470 /* exported operations */
471 struct super_operations obdfs_super_operations =
473 read_inode2: obdfs_read_inode2,
474 put_inode: obdfs_put_inode,
475 delete_inode: obdfs_delete_inode,
476 put_super: obdfs_put_super,
481 struct file_system_type obdfs_fs_type = {
482 "obdfs", 0, obdfs_read_super, NULL
489 printk(KERN_INFO "OBDFS v0.1, braam@stelias.com\n");
493 INIT_LIST_HEAD(&obdfs_super_list);
494 //err = obdfs_init_pgrqcache();
498 //obdfs_flushd_init();
499 return register_filesystem(&obdfs_fs_type);
506 int init_module(void)
511 void cleanup_module(void)
515 //obdfs_flushd_cleanup();
516 obdfs_sysctl_clean();
517 //obdfs_cleanup_pgrqcache();
518 unregister_filesystem(&obdfs_fs_type);
519 CDEBUG(D_MALLOC, "OBDFS mem used %ld\n", obd_memory);