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");
128 obddev = &obd_dev[devno];
130 CDEBUG(D_INFO, "\n");
131 if ( ! (obddev->obd_flags & OBD_ATTACHED) ||
132 ! (obddev->obd_flags & OBD_SET_UP) ){
133 printk("device %s not attached or not set up (%d)\n",
134 device, MINOR(devno));
139 CDEBUG(D_INFO, "\n");
140 sbi->osi_obd = obddev;
141 sbi->osi_ops = sbi->osi_obd->obd_type->typ_ops;
143 sbi->osi_conn.oc_dev = obddev;
144 err = obd_connect(&sbi->osi_conn);
146 printk("OBDFS: cannot connect to %s\n", device);
151 CDEBUG(D_INFO, "\n");
152 /* list of dirty inodes, and a mutex to hold while modifying it */
153 INIT_LIST_HEAD(&sbi->osi_inodes);
154 init_MUTEX (&sbi->osi_list_mutex);
156 CDEBUG(D_INFO, "\n");
159 CDEBUG(D_INFO, "\n");
160 err = sbi->osi_ops->o_get_info(&sbi->osi_conn, strlen("blocksize"),
161 "blocksize", &scratch,
164 printk("getinfo call to drive failed (blocksize)\n");
169 CDEBUG(D_INFO, "\n");
170 err = sbi->osi_ops->o_get_info(&sbi->osi_conn, strlen("blocksize_bits"),
171 "blocksize_bits", &scratch,
172 (void *)&blocksize_bits);
174 printk("getinfo call to drive failed (blocksize_bits)\n");
179 CDEBUG(D_INFO, "\n");
180 err = sbi->osi_ops->o_get_info(&sbi->osi_conn, strlen("root_ino"),
181 "root_ino", &scratch, (void *)&root_ino);
183 printk("getinfo call to drive failed (root_ino)\n");
188 CDEBUG(D_INFO, "\n");
189 sb->s_maxbytes = 1LL << 36;
190 printk("Max bytes: %Lx\n", sb->s_maxbytes);
191 sb->s_blocksize = PAGE_SIZE;
192 sb->s_blocksize_bits = (unsigned char)PAGE_SHIFT;
193 sb->s_magic = OBDFS_SUPER_MAGIC;
194 sb->s_op = &obdfs_super_operations;
196 /* XXX how to get "sb->s_flags |= MS_RDONLY" here for snapshots? */
198 /* make root inode */
199 CDEBUG(D_INFO, "\n");
200 oa = obdo_fromid(&sbi->osi_conn, root_ino, S_IFDIR,
201 OBD_MD_FLNOTOBD | OBD_MD_FLBLOCKS);
202 CDEBUG(D_INFO, "mode %o\n", oa->o_mode);
204 printk(__FUNCTION__ ": obdo_fromid failed\n");
209 CDEBUG(D_INFO, "\n");
210 root = iget4(sb, root_ino, NULL, oa);
212 CDEBUG(D_INFO, "\n");
214 printk("OBDFS: bad iget4 for root\n");
221 CDEBUG(D_INFO, "obdfs_read_super: sbdev %d, rootino: %ld, dev %s, "
222 "minor: %d, blocksize: %ld, blocksize bits %ld\n",
223 sb->s_dev, root->i_ino, device, MINOR(devno),
224 blocksize, blocksize_bits);
225 sb->s_root = d_alloc_root(root);
226 list_add(&sbi->osi_list, &obdfs_super_list);
227 OBD_FREE(device, strlen(device) + 1);
229 OBD_FREE(version, strlen(version) + 1);
236 OBD_FREE(device, strlen(device) + 1);
238 OBD_FREE(version, strlen(version) + 1);
240 sbi->osi_ops->o_disconnect(&sbi->osi_conn);
243 sbi->osi_super = NULL;
250 } /* obdfs_read_super */
253 static void obdfs_put_super(struct super_block *sb)
255 struct obdfs_sb_info *sbi;
260 sbi = (struct obdfs_sb_info *) &sb->u.generic_sbp;
261 //obdfs_flush_reqs(&sbi->osi_inodes, ~0UL);
263 OPS(sb,disconnect)(ID(sb));
264 list_del(&sbi->osi_list);
266 printk(KERN_INFO "OBDFS: Bye bye.\n");
270 } /* obdfs_put_super */
273 void obdfs_do_change_inode(struct inode *inode, int valid)
279 if (IOPS(inode, setattr) == NULL) {
280 printk(KERN_ERR __FUNCTION__ ": no setattr method!\n");
286 printk(__FUNCTION__ ": obdo_alloc failed\n");
291 oa->o_valid = OBD_MD_FLNOTOBD & (valid | OBD_MD_FLID);
292 obdfs_from_inode(oa, inode);
293 oa->o_mode = inode->i_mode;
294 err = IOPS(inode, setattr)(IID(inode), oa);
297 printk(__FUNCTION__ ": obd_setattr fails (%d)\n", err);
301 } /* obdfs_write_inode */
303 void obdfs_change_inode(struct inode *inode, int mask)
305 return obdfs_do_change_inode(inode, OBD_MD_FLNLINK);
309 extern void write_inode_pages(struct inode *);
310 /* This routine is called from iput() (for each unlink on the inode).
311 * We can't put this call into delete_inode() since that is called only
312 * when i_count == 0, and we need to keep a reference on the inode while
313 * it is in the page cache, which means i_count > 0. Catch 22.
315 static void obdfs_put_inode(struct inode *inode)
318 if (inode->i_nlink && (atomic_read(&inode->i_count) == 1)) {
319 write_inode_pages(inode);
324 //obdfs_dequeue_pages(inode);
326 } /* obdfs_put_inode */
329 static void obdfs_delete_inode(struct inode *inode)
331 obdfs_do_change_inode(inode, ~0);
340 if (IOPS(inode, destroy) == NULL) {
341 printk(KERN_ERR __FUNCTION__ ": no destroy method!\n");
348 printk(__FUNCTION__ ": obdo_alloc failed\n");
352 oa->o_valid = OBD_MD_FLNOTOBD;
353 obdfs_from_inode(oa, inode);
355 /* XXX how do we know that this inode is now clean? */
356 printk("delete_inode ------> link %d\n", inode->i_nlink);
358 err = IOPS(inode, destroy)(IID(inode), oa);
362 printk(__FUNCTION__ ": obd_destroy fails (%d)\n", err);
368 } /* obdfs_delete_inode */
372 static int obdfs_attr2inode(struct inode * inode, struct iattr * attr)
374 unsigned int ia_valid = attr->ia_valid;
377 if (ia_valid & ATTR_SIZE) {
378 error = vmtruncate(inode, attr->ia_size);
383 if (ia_valid & ATTR_UID)
384 inode->i_uid = attr->ia_uid;
385 if (ia_valid & ATTR_GID)
386 inode->i_gid = attr->ia_gid;
387 if (ia_valid & ATTR_ATIME)
388 inode->i_atime = attr->ia_atime;
389 if (ia_valid & ATTR_MTIME)
390 inode->i_mtime = attr->ia_mtime;
391 if (ia_valid & ATTR_CTIME)
392 inode->i_ctime = attr->ia_ctime;
393 if (ia_valid & ATTR_MODE) {
394 inode->i_mode = attr->ia_mode;
395 if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID))
396 inode->i_mode &= ~S_ISGID;
402 int obdfs_setattr(struct dentry *de, struct iattr *attr)
404 struct inode *inode = de->d_inode;
409 if (IOPS(inode, setattr) == NULL) {
410 printk(KERN_ERR __FUNCTION__ ": no setattr method!\n");
416 printk(__FUNCTION__ ": obdo_alloc failed\n");
420 obdfs_attr2inode(inode, attr);
421 oa->o_id = inode->i_ino;
422 oa->o_mode = inode->i_mode;
423 obdo_from_iattr(oa, attr);
424 err = IOPS(inode, setattr)(IID(inode), oa);
427 printk(__FUNCTION__ ": obd_setattr fails (%d)\n", err);
432 } /* obdfs_setattr */
436 static int obdfs_statfs(struct super_block *sb, struct statfs *buf)
443 err = OPS(sb,statfs)(ID(sb), &tmp);
445 printk(__FUNCTION__ ": obd_statfs fails (%d)\n", err);
448 memcpy(buf, &tmp, sizeof(*buf));
449 CDEBUG(D_SUPER, "statfs returns avail %ld\n", tmp.f_bavail);
455 static inline void obdfs_read_inode2(struct inode *inode, void *opaque)
457 struct obdo *oa = opaque;
460 obdfs_to_inode(inode, oa);
462 INIT_LIST_HEAD(obdfs_iplist(inode)); /* list of dirty pages on inode */
463 INIT_LIST_HEAD(obdfs_islist(inode)); /* list of inodes in superblock */
465 /* OIDEBUG(inode); */
467 if (S_ISREG(inode->i_mode)) {
468 inode->i_op = &obdfs_file_inode_operations;
469 inode->i_fop = &obdfs_file_operations;
470 inode->i_mapping->a_ops = &obdfs_aops;
472 } else if (S_ISDIR(inode->i_mode)) {
473 inode->i_op = &obdfs_dir_inode_operations;
474 inode->i_fop = &obdfs_dir_operations;
475 inode->i_mapping->a_ops = &obdfs_aops;
477 } else if (S_ISLNK(inode->i_mode)) {
478 if (inode->i_blocks) {
479 inode->i_op = &obdfs_symlink_inode_operations;
480 inode->i_mapping->a_ops = &obdfs_aops;
482 inode->i_op = &obdfs_fast_symlink_inode_operations;
486 init_special_inode(inode, inode->i_mode,
487 ((int *)obdfs_i2info(inode)->oi_inline)[0]);
494 /* exported operations */
495 struct super_operations obdfs_super_operations =
497 read_inode2: obdfs_read_inode2,
498 put_inode: obdfs_put_inode,
499 delete_inode: obdfs_delete_inode,
500 put_super: obdfs_put_super,
505 struct file_system_type obdfs_fs_type = {
506 "obdfs", 0, obdfs_read_super, NULL
513 printk(KERN_INFO "OBDFS v0.1, braam@stelias.com\n");
517 INIT_LIST_HEAD(&obdfs_super_list);
518 //err = obdfs_init_pgrqcache();
522 //obdfs_flushd_init();
523 return register_filesystem(&obdfs_fs_type);
530 int init_module(void)
535 void cleanup_module(void)
539 //obdfs_flushd_cleanup();
540 obdfs_sysctl_clean();
541 //obdfs_cleanup_pgrqcache();
542 unregister_filesystem(&obdfs_fs_type);
543 CDEBUG(D_MALLOC, "OBDFS mem used %ld\n", obd_memory);