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;
47 static char *obdfs_read_opt(const char *opt, char *data)
52 CDEBUG(D_INFO, "option: %s, data %s\n", opt, data);
53 if ( strncmp(opt, data, strlen(opt)) )
56 if ( (value = strchr(data, '=')) == NULL )
60 OBD_ALLOC(retval, strlen(value) + 1);
62 CERROR("out of memory!\n");
66 memcpy(retval, value, strlen(value)+1);
67 CDEBUG(D_SUPER, "Assigned option: %s, value %s\n", opt, retval);
71 static void obdfs_options(char *options, char **dev, char **vers)
78 for (this_char = strtok (options, ",");
80 this_char = strtok (NULL, ",")) {
81 CDEBUG(D_INFO, "this_char %s\n", this_char);
82 if ( (!*dev && (*dev = obdfs_read_opt("device", this_char)))||
83 (!*vers && (*vers = obdfs_read_opt("version", this_char))) )
89 static struct super_block * obdfs_read_super(struct super_block *sb,
90 void *data, int silent)
92 struct inode *root = 0;
93 struct obdfs_sb_info *sbi = (struct obdfs_sb_info *)(&sb->u.generic_sbp);
94 struct obd_device *obddev;
100 unsigned long blocksize;
101 unsigned long blocksize_bits;
102 unsigned long root_ino;
110 memset(sbi, 0, sizeof(*sbi));
112 CDEBUG(D_INFO, "\n");
113 obdfs_options(data, &device, &version);
115 CERROR("no device\n");
120 devno = simple_strtoul(device, NULL, 0);
121 CDEBUG(D_INFO, "\n");
122 if ( devno >= MAX_OBD_DEVICES ) {
123 CERROR("device of %s too high (%d)\n", device, devno);
128 CDEBUG(D_INFO, "\n");
130 obddev = &obd_dev[devno];
131 sbi->osi_obd = obddev;
132 sbi->osi_conn.oc_dev = obddev;
134 err = obd_connect(&sbi->osi_conn);
136 CERROR("OBDFS: cannot connect to %s\n", device);
142 CDEBUG(D_INFO, "\n");
143 /* list of dirty inodes, and a mutex to hold while modifying it */
144 INIT_LIST_HEAD(&sbi->osi_inodes);
145 init_MUTEX (&sbi->osi_list_mutex);
147 CDEBUG(D_INFO, "\n");
150 CDEBUG(D_INFO, "\n");
151 err = obd_get_info(&sbi->osi_conn, strlen("blocksize"),
152 "blocksize", &scratch,
155 CERROR("getinfo call to drive failed (blocksize)\n");
160 CDEBUG(D_INFO, "\n");
161 err = obd_get_info(&sbi->osi_conn, strlen("blocksize_bits"),
162 "blocksize_bits", &scratch,
163 (void *)&blocksize_bits);
165 CERROR("getinfo call to drive failed (blocksize_bits)\n");
170 CDEBUG(D_INFO, "\n");
171 err = obd_get_info(&sbi->osi_conn, strlen("root_ino"),
172 "root_ino", &scratch, (void *)&root_ino);
174 CERROR("getinfo call to drive failed (root_ino)\n");
179 CDEBUG(D_INFO, "\n");
180 sb->s_maxbytes = 1LL << 36;
181 CERROR("Max bytes: %Lx\n", sb->s_maxbytes);
182 sb->s_blocksize = PAGE_SIZE;
183 sb->s_blocksize_bits = (unsigned char)PAGE_SHIFT;
184 sb->s_magic = OBDFS_SUPER_MAGIC;
185 sb->s_op = &obdfs_super_operations;
187 /* XXX how to get "sb->s_flags |= MS_RDONLY" here for snapshots? */
189 /* make root inode */
190 CDEBUG(D_INFO, "\n");
191 oa = obdo_fromid(&sbi->osi_conn, root_ino, S_IFDIR,
192 (__u32)(OBD_MD_FLNOTOBD | OBD_MD_FLBLOCKS));
193 CDEBUG(D_INFO, "mode %o\n", oa->o_mode);
195 CERROR("obdo_fromid failed\n");
200 CDEBUG(D_INFO, "\n");
201 root = iget4(sb, root_ino, NULL, oa);
203 CDEBUG(D_INFO, "\n");
205 CERROR("OBDFS: bad iget4 for root\n");
212 CDEBUG(D_INFO, "sbdev %d, rootino: %ld, dev %s, "
213 "minor: %d, blocksize: %ld, blocksize bits %ld\n",
214 sb->s_dev, root->i_ino, device, MINOR(devno),
215 blocksize, blocksize_bits);
216 sb->s_root = d_alloc_root(root);
217 list_add(&sbi->osi_list, &obdfs_super_list);
218 OBD_FREE(device, strlen(device) + 1);
220 OBD_FREE(version, strlen(version) + 1);
227 OBD_FREE(device, strlen(device) + 1);
229 OBD_FREE(version, strlen(version) + 1);
231 obd_disconnect(&sbi->osi_conn);
234 sbi->osi_super = NULL;
241 } /* obdfs_read_super */
244 static void obdfs_put_super(struct super_block *sb)
246 struct obdfs_sb_info *sbi;
251 sbi = (struct obdfs_sb_info *) &sb->u.generic_sbp;
252 //obdfs_flush_reqs(&sbi->osi_inodes, ~0UL);
254 obd_disconnect(ID(sb));
255 list_del(&sbi->osi_list);
257 CERROR("OBDFS: Bye bye.\n");
261 } /* obdfs_put_super */
264 void obdfs_do_change_inode(struct inode *inode, int valid)
272 CERROR("obdo_alloc failed\n");
277 oa->o_valid = OBD_MD_FLNOTOBD & (valid | OBD_MD_FLID);
278 obdfs_from_inode(oa, inode);
279 oa->o_mode = inode->i_mode;
280 err = obd_setattr(IID(inode), oa);
283 CERROR("obd_setattr fails (%d)\n", err);
287 } /* obdfs_write_inode */
289 void obdfs_change_inode(struct inode *inode, int mask)
291 return obdfs_do_change_inode(inode, OBD_MD_FLNLINK);
295 extern void write_inode_pages(struct inode *);
296 /* This routine is called from iput() (for each unlink on the inode).
297 * We can't put this call into delete_inode() since that is called only
298 * when i_count == 0, and we need to keep a reference on the inode while
299 * it is in the page cache, which means i_count > 0. Catch 22.
301 static void obdfs_put_inode(struct inode *inode)
304 if (inode->i_nlink && (atomic_read(&inode->i_count) == 1)) {
305 write_inode_pages(inode);
310 //obdfs_dequeue_pages(inode);
312 } /* obdfs_put_inode */
315 static void obdfs_delete_inode(struct inode *inode)
317 obdfs_do_change_inode(inode, ~0);
328 CERROR("obdo_alloc failed\n");
332 oa->o_valid = OBD_MD_FLNOTOBD;
333 obdfs_from_inode(oa, inode);
335 /* XXX how do we know that this inode is now clean? */
336 CERROR("delete_inode ------> link %d\n", inode->i_nlink);
338 err = obd_destroy(IID(inode), oa);
342 CERROR("obd_destroy fails (%d)\n", err);
348 } /* obdfs_delete_inode */
352 static int obdfs_attr2inode(struct inode * inode, struct iattr * attr)
354 unsigned int ia_valid = attr->ia_valid;
357 if (ia_valid & ATTR_SIZE) {
358 error = vmtruncate(inode, attr->ia_size);
363 if (ia_valid & ATTR_UID)
364 inode->i_uid = attr->ia_uid;
365 if (ia_valid & ATTR_GID)
366 inode->i_gid = attr->ia_gid;
367 if (ia_valid & ATTR_ATIME)
368 inode->i_atime = attr->ia_atime;
369 if (ia_valid & ATTR_MTIME)
370 inode->i_mtime = attr->ia_mtime;
371 if (ia_valid & ATTR_CTIME)
372 inode->i_ctime = attr->ia_ctime;
373 if (ia_valid & ATTR_MODE) {
374 inode->i_mode = attr->ia_mode;
375 if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID))
376 inode->i_mode &= ~S_ISGID;
382 int obdfs_setattr(struct dentry *de, struct iattr *attr)
384 struct inode *inode = de->d_inode;
391 CERROR("obdo_alloc failed\n");
395 obdfs_attr2inode(inode, attr);
396 oa->o_id = inode->i_ino;
397 oa->o_mode = inode->i_mode;
398 obdo_from_iattr(oa, attr);
399 err = obd_setattr(IID(inode), oa);
402 CERROR("obd_setattr fails (%d)\n", err);
407 } /* obdfs_setattr */
411 static int obdfs_statfs(struct super_block *sb, struct statfs *buf)
418 err = obd_statfs(ID(sb), &tmp);
420 CERROR("obd_statfs fails (%d)\n", err);
423 memcpy(buf, &tmp, sizeof(*buf));
424 CDEBUG(D_SUPER, "statfs returns avail %ld\n", tmp.f_bavail);
430 static inline void obdfs_read_inode2(struct inode *inode, void *opaque)
432 struct obdo *oa = opaque;
435 obdfs_to_inode(inode, oa);
437 INIT_LIST_HEAD(obdfs_iplist(inode)); /* list of dirty pages on inode */
438 INIT_LIST_HEAD(obdfs_islist(inode)); /* list of inodes in superblock */
440 /* OIDEBUG(inode); */
442 if (S_ISREG(inode->i_mode)) {
443 inode->i_op = &obdfs_file_inode_operations;
444 inode->i_fop = &obdfs_file_operations;
445 inode->i_mapping->a_ops = &obdfs_aops;
447 } else if (S_ISDIR(inode->i_mode)) {
448 inode->i_op = &obdfs_dir_inode_operations;
449 inode->i_fop = &obdfs_dir_operations;
450 inode->i_mapping->a_ops = &obdfs_aops;
452 } else if (S_ISLNK(inode->i_mode)) {
453 if (inode->i_blocks) {
454 inode->i_op = &obdfs_symlink_inode_operations;
455 inode->i_mapping->a_ops = &obdfs_aops;
457 inode->i_op = &obdfs_fast_symlink_inode_operations;
461 init_special_inode(inode, inode->i_mode,
462 ((int *)obdfs_i2info(inode)->oi_inline)[0]);
469 /* exported operations */
470 struct super_operations obdfs_super_operations =
472 read_inode2: obdfs_read_inode2,
473 put_inode: obdfs_put_inode,
474 delete_inode: obdfs_delete_inode,
475 put_super: obdfs_put_super,
480 struct file_system_type obdfs_fs_type = {
481 "obdfs", 0, obdfs_read_super, NULL
488 printk(KERN_INFO "OBDFS v0.1, braam@stelias.com\n");
492 INIT_LIST_HEAD(&obdfs_super_list);
493 //err = obdfs_init_pgrqcache();
497 //obdfs_flushd_init();
498 return register_filesystem(&obdfs_fs_type);
505 int init_module(void)
510 void cleanup_module(void)
514 //obdfs_flushd_cleanup();
515 obdfs_sysctl_clean();
516 //obdfs_cleanup_pgrqcache();
517 unregister_filesystem(&obdfs_fs_type);
518 CDEBUG(D_MALLOC, "OBDFS mem used %ld\n", obd_memory);