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;
109 memset(sbi, 0, sizeof(*sbi));
111 CDEBUG(D_INFO, "\n");
112 obdfs_options(data, &device, &version);
114 CERROR("no device\n");
119 devno = simple_strtoul(device, NULL, 0);
120 CDEBUG(D_INFO, "\n");
121 if (devno >= MAX_OBD_DEVICES) {
122 CERROR("device of %s too high (%d)\n", device, devno);
127 CDEBUG(D_INFO, "\n");
129 obddev = &obd_dev[devno];
130 sbi->osi_obd = obddev;
132 err = obd_connect(&sbi->osi_conn, obddev);
134 CERROR("OBDFS: cannot connect to %s\n", device);
140 CDEBUG(D_INFO, "\n");
141 /* list of dirty inodes, and a mutex to hold while modifying it */
142 INIT_LIST_HEAD(&sbi->osi_inodes);
143 init_MUTEX (&sbi->osi_list_mutex);
145 CDEBUG(D_INFO, "\n");
148 CDEBUG(D_INFO, "\n");
149 err = obd_get_info(&sbi->osi_conn, strlen("blocksize"),
150 "blocksize", &scratch,
153 CERROR("getinfo call to drive failed (blocksize)\n");
158 CDEBUG(D_INFO, "\n");
159 err = obd_get_info(&sbi->osi_conn, strlen("blocksize_bits"),
160 "blocksize_bits", &scratch,
161 (void *)&blocksize_bits);
163 CERROR("getinfo call to drive failed (blocksize_bits)\n");
168 CDEBUG(D_INFO, "\n");
169 err = obd_get_info(&sbi->osi_conn, strlen("root_ino"),
170 "root_ino", &scratch, (void *)&root_ino);
172 CERROR("getinfo call to drive failed (root_ino)\n");
177 CDEBUG(D_INFO, "\n");
178 sb->s_maxbytes = 1LL << 36;
179 CERROR("Max bytes: %Lx\n", sb->s_maxbytes);
180 sb->s_blocksize = PAGE_SIZE;
181 sb->s_blocksize_bits = (unsigned char)PAGE_SHIFT;
182 sb->s_magic = OBDFS_SUPER_MAGIC;
183 sb->s_op = &obdfs_super_operations;
185 /* XXX how to get "sb->s_flags |= MS_RDONLY" here for snapshots? */
187 /* make root inode */
188 CDEBUG(D_INFO, "\n");
189 oa = obdo_fromid(&sbi->osi_conn, root_ino, S_IFDIR,
190 (__u32)(OBD_MD_FLNOTOBD | OBD_MD_FLBLOCKS));
191 CDEBUG(D_INFO, "mode %o\n", oa->o_mode);
193 CERROR("obdo_fromid failed\n");
198 CDEBUG(D_INFO, "\n");
199 root = iget4(sb, (ino_t)root_ino, NULL, oa);
201 CDEBUG(D_INFO, "\n");
203 CERROR("OBDFS: bad iget4 for root\n");
210 CDEBUG(D_INFO, "sbdev %d, rootino: %Ld, dev %s, "
211 "minor: %d, blocksize: %ld, blocksize bits %ld\n",
212 sb->s_dev, (long long)root_ino, device, MINOR(devno),
213 blocksize, blocksize_bits);
214 sb->s_root = d_alloc_root(root);
215 list_add(&sbi->osi_list, &obdfs_super_list);
216 OBD_FREE(device, strlen(device) + 1);
218 OBD_FREE(version, strlen(version) + 1);
225 OBD_FREE(device, strlen(device) + 1);
227 OBD_FREE(version, strlen(version) + 1);
229 obd_disconnect(&sbi->osi_conn);
232 sbi->osi_super = NULL;
239 } /* obdfs_read_super */
242 static void obdfs_put_super(struct super_block *sb)
244 struct obdfs_sb_info *sbi;
249 sbi = (struct obdfs_sb_info *) &sb->u.generic_sbp;
250 //obdfs_flush_reqs(&sbi->osi_inodes, ~0UL);
252 obd_disconnect(ID(sb));
253 list_del(&sbi->osi_list);
255 CERROR("OBDFS: Bye bye.\n");
259 } /* obdfs_put_super */
262 void obdfs_do_change_inode(struct inode *inode, int valid)
270 CERROR("obdo_alloc failed\n");
275 oa->o_valid = OBD_MD_FLNOTOBD & (valid | OBD_MD_FLID);
276 obdfs_from_inode(oa, inode);
277 oa->o_mode = inode->i_mode;
278 err = obd_setattr(IID(inode), oa);
281 CERROR("obd_setattr fails (%d)\n", err);
285 } /* obdfs_write_inode */
287 void obdfs_change_inode(struct inode *inode, int mask)
289 return obdfs_do_change_inode(inode, OBD_MD_FLNLINK);
293 extern void write_inode_pages(struct inode *);
294 /* This routine is called from iput() (for each unlink on the inode).
295 * We can't put this call into delete_inode() since that is called only
296 * when i_count == 0, and we need to keep a reference on the inode while
297 * it is in the page cache, which means i_count > 0. Catch 22.
299 static void obdfs_put_inode(struct inode *inode)
302 if (inode->i_nlink && (atomic_read(&inode->i_count) == 1)) {
303 write_inode_pages(inode);
308 //obdfs_dequeue_pages(inode);
310 } /* obdfs_put_inode */
313 static void obdfs_delete_inode(struct inode *inode)
315 obdfs_do_change_inode(inode, ~0);
326 CERROR("obdo_alloc failed\n");
330 oa->o_valid = OBD_MD_FLNOTOBD;
331 obdfs_from_inode(oa, inode);
333 /* XXX how do we know that this inode is now clean? */
334 CERROR("delete_inode ------> link %d\n", inode->i_nlink);
336 err = obd_destroy(IID(inode), oa);
340 CERROR("obd_destroy fails (%d)\n", err);
346 } /* obdfs_delete_inode */
350 static int obdfs_attr2inode(struct inode * inode, struct iattr * attr)
352 unsigned int ia_valid = attr->ia_valid;
355 if (ia_valid & ATTR_SIZE) {
356 error = vmtruncate(inode, attr->ia_size);
361 if (ia_valid & ATTR_UID)
362 inode->i_uid = attr->ia_uid;
363 if (ia_valid & ATTR_GID)
364 inode->i_gid = attr->ia_gid;
365 if (ia_valid & ATTR_ATIME)
366 inode->i_atime = attr->ia_atime;
367 if (ia_valid & ATTR_MTIME)
368 inode->i_mtime = attr->ia_mtime;
369 if (ia_valid & ATTR_CTIME)
370 inode->i_ctime = attr->ia_ctime;
371 if (ia_valid & ATTR_MODE) {
372 inode->i_mode = attr->ia_mode;
373 if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID))
374 inode->i_mode &= ~S_ISGID;
380 int obdfs_setattr(struct dentry *de, struct iattr *attr)
382 struct inode *inode = de->d_inode;
389 CERROR("obdo_alloc failed\n");
393 obdfs_attr2inode(inode, attr);
394 oa->o_id = inode->i_ino;
395 oa->o_mode = inode->i_mode;
396 obdo_from_iattr(oa, attr);
397 err = obd_setattr(IID(inode), oa);
400 CERROR("obd_setattr fails (%d)\n", err);
405 } /* obdfs_setattr */
409 static int obdfs_statfs(struct super_block *sb, struct statfs *sfs)
415 rc = obd_statfs(ID(sb), sfs);
417 CERROR("obd_statfs fails: rc = %d\n", rc);
419 CDEBUG(D_SUPER, "statfs returns avail %ld\n", sfs->f_bavail);
424 static inline void obdfs_read_inode2(struct inode *inode, void *opaque)
426 struct obdo *oa = opaque;
429 obdfs_to_inode(inode, oa);
431 INIT_LIST_HEAD(obdfs_iplist(inode)); /* list of dirty pages on inode */
432 INIT_LIST_HEAD(obdfs_islist(inode)); /* list of inodes in superblock */
434 /* OIDEBUG(inode); */
436 if (S_ISREG(inode->i_mode)) {
437 inode->i_op = &obdfs_file_inode_operations;
438 inode->i_fop = &obdfs_file_operations;
439 inode->i_mapping->a_ops = &obdfs_aops;
441 } else if (S_ISDIR(inode->i_mode)) {
442 inode->i_op = &obdfs_dir_inode_operations;
443 inode->i_fop = &obdfs_dir_operations;
444 inode->i_mapping->a_ops = &obdfs_aops;
446 } else if (S_ISLNK(inode->i_mode)) {
447 if (inode->i_blocks) {
448 inode->i_op = &obdfs_symlink_inode_operations;
449 inode->i_mapping->a_ops = &obdfs_aops;
451 inode->i_op = &obdfs_fast_symlink_inode_operations;
455 init_special_inode(inode, inode->i_mode,
456 ((int *)obdfs_i2info(inode)->oi_inline)[0]);
463 /* exported operations */
464 struct super_operations obdfs_super_operations =
466 read_inode2: obdfs_read_inode2,
467 put_inode: obdfs_put_inode,
468 delete_inode: obdfs_delete_inode,
469 put_super: obdfs_put_super,
474 struct file_system_type obdfs_fs_type = {
475 "obdfs", 0, obdfs_read_super, NULL
482 printk(KERN_INFO "OBDFS v0.1, info@clusterfs.com\n");
486 INIT_LIST_HEAD(&obdfs_super_list);
487 //err = obdfs_init_pgrqcache();
491 //obdfs_flushd_init();
492 return register_filesystem(&obdfs_fs_type);
499 int init_module(void)
504 void cleanup_module(void)
508 //obdfs_flushd_cleanup();
509 obdfs_sysctl_clean();
510 //obdfs_cleanup_pgrqcache();
511 unregister_filesystem(&obdfs_fs_type);
512 CDEBUG(D_MALLOC, "OBDFS mem used %ld\n", obd_memory);