2 * OBDFS Super operations
4 * This code is issued under the GNU General Public License.
5 * See the file COPYING in this distribution
7 * Copryright (C) 1996 Peter J. Braam <braam@stelias.com>
8 * Copryright (C) 1999 Stelias Computing Inc. <braam@stelias.com>
9 * Copryright (C) 1999 Seagate Technology Inc.
10 * Copryright (C) 2001 Mountain View Data, Inc.
11 * Copryright (C) 2002 Cluster File Systems, Inc.
15 #include <linux/config.h>
16 #include <linux/module.h>
17 #include <linux/kernel.h>
19 #include <linux/string.h>
20 #include <linux/stat.h>
21 #include <linux/errno.h>
22 #include <linux/locks.h>
23 #include <linux/unistd.h>
25 #include <asm/system.h>
26 #include <asm/uaccess.h>
29 #include <linux/stat.h>
30 #include <asm/uaccess.h>
31 #include <linux/vmalloc.h>
32 #include <asm/segment.h>
34 #include <linux/obd_support.h>
35 #include <linux/obd_class.h>
36 #include <linux/lustre_light.h>
38 //struct list_head ll_super_list;
39 extern struct address_space_operations ll_aops;
40 struct super_operations ll_super_operations;
41 long ll_cache_count = 0;
42 long ll_mutex_start = 0;
45 static char *ll_read_opt(const char *opt, char *data)
50 CDEBUG(D_INFO, "option: %s, data %s\n", opt, data);
51 if ( strncmp(opt, data, strlen(opt)) )
54 if ( (value = strchr(data, '=')) == NULL )
58 OBD_ALLOC(retval, char *, strlen(value) + 1);
60 printk(KERN_ALERT __FUNCTION__ ": out of memory!\n");
64 memcpy(retval, value, strlen(value)+1);
65 CDEBUG(D_PSDEV, "Assigned option: %s, value %s\n", opt, retval);
69 static void ll_options(char *options, char **dev, char **vers)
76 for (this_char = strtok (options, ",");
78 this_char = strtok (NULL, ",")) {
79 CDEBUG(D_INFO, "this_char %s\n", this_char);
80 if ( (!*dev && (*dev = ll_read_opt("device", this_char)))||
81 (!*vers && (*vers = ll_read_opt("version", this_char))) )
87 static struct super_block * ll_read_super(struct super_block *sb,
88 void *data, int silent)
90 struct inode *root = 0;
91 struct ll_sb_info *sbi = (struct ll_sb_info *)(&sb->u.generic_sbp);
92 struct obd_device *obddev;
100 struct mds_rep_hdr *hdr = NULL;
105 memset(sbi, 0, sizeof(*sbi));
107 CDEBUG(D_INFO, "\n");
108 ll_options(data, &device, &version);
110 printk(__FUNCTION__ ": no device\n");
115 devno = simple_strtoul(device, NULL, 0);
116 CDEBUG(D_INFO, "\n");
117 if ( devno >= MAX_OBD_DEVICES ) {
118 printk(__FUNCTION__ ": device of %s too high (%d)\n", device, devno);
123 CDEBUG(D_INFO, "\n");
124 obddev = &obd_dev[devno];
127 CDEBUG(D_INFO, "\n");
128 if ( ! (obddev->obd_flags & OBD_ATTACHED) ||
129 ! (obddev->obd_flags & OBD_SET_UP) ){
130 printk("device %s not attached or not set up (%d)\n",
131 device, MINOR(devno));
136 CDEBUG(D_INFO, "\n");
137 sbi->ll_obd = obddev;
138 sbi->ll_ops = sbi->ll_obd->obd_type->typ_ops;
139 sbi->ll_conn.oc_dev = obddev;
141 CDEBUG(D_INFO, "\n");
142 err = sbi->ll_ops->o_connect(&sbi->ll_conn);
143 CDEBUG(D_INFO, "\n");
145 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->ll_inodes);
154 init_MUTEX (&sbi->ll_list_mutex);
156 CDEBUG(D_INFO, "\n");
160 CDEBUG(D_INFO, "\n");
161 sb->s_maxbytes = 1LL << 36;
162 printk("Max bytes: %Lx\n", sb->s_maxbytes);
163 sb->s_blocksize = PAGE_SIZE;
164 sb->s_blocksize_bits = (unsigned char)PAGE_SHIFT;
165 sb->s_magic = LL_SUPER_MAGIC;
166 sb->s_op = &ll_super_operations;
168 /* make root inode */
169 CDEBUG(D_INFO, "\n");
170 err = mdc_getattr(root_ino, S_IFDIR, OBD_MD_FLNOTOBD|OBD_MD_FLBLOCKS,
173 printk(__FUNCTION__ ": mds_getattr failed %d\n", err);
181 CDEBUG(D_INFO, "mode %o\n", rep->mode);
182 CDEBUG(D_INFO, "\n");
183 root = iget4(sb, root_ino, NULL, rep);
185 CDEBUG(D_INFO, "\n");
187 printk("OBDFS: bad iget4 for root\n");
194 sb->s_root = d_alloc_root(root);
195 // list_add(&sbi->ll_list, &ll_super_list);
196 OBD_FREE(device, strlen(device) + 1);
198 OBD_FREE(version, strlen(version) + 1);
205 OBD_FREE(device, strlen(device) + 1);
207 OBD_FREE(version, strlen(version) + 1);
209 sbi->ll_ops->o_disconnect(&sbi->ll_conn);
212 sbi->ll_super = NULL;
219 } /* ll_read_super */
222 static void ll_put_super(struct super_block *sb)
224 struct ll_sb_info *sbi;
229 sbi = (struct ll_sb_info *) &sb->u.generic_sbp;
230 //ll_flush_reqs(&sbi->ll_inodes, ~0UL);
232 OPS(sb,disconnect)(ID(sb));
233 list_del(&sbi->ll_list);
235 printk(KERN_INFO "OBDFS: Bye bye.\n");
242 void ll_do_change_inode(struct inode *inode, int valid)
248 if (IOPS(inode, setattr) == NULL) {
249 printk(KERN_ERR __FUNCTION__ ": no setattr method!\n");
255 printk(__FUNCTION__ ": obdo_alloc failed\n");
260 oa->o_valid = OBD_MD_FLNOTOBD & (valid | OBD_MD_FLID);
261 ll_from_inode(oa, inode);
262 oa->o_mode = inode->i_mode;
263 err = IOPS(inode, setattr)(IID(inode), oa);
266 printk(__FUNCTION__ ": obd_setattr fails (%d)\n", err);
270 } /* ll_write_inode */
272 void ll_change_inode(struct inode *inode, int mask)
274 return ll_do_change_inode(inode, OBD_MD_FLNLINK);
278 extern void write_inode_pages(struct inode *);
279 /* This routine is called from iput() (for each unlink on the inode).
280 * We can't put this call into delete_inode() since that is called only
281 * when i_count == 0, and we need to keep a reference on the inode while
282 * it is in the page cache, which means i_count > 0. Catch 22.
284 static void ll_put_inode(struct inode *inode)
287 if (inode->i_nlink && (atomic_read(&inode->i_count) == 1)) {
288 write_inode_pages(inode);
293 //ll_dequeue_pages(inode);
298 static void ll_delete_inode(struct inode *inode)
300 ll_do_change_inode(inode, ~0);
309 if (IOPS(inode, destroy) == NULL) {
310 printk(KERN_ERR __FUNCTION__ ": no destroy method!\n");
317 printk(__FUNCTION__ ": obdo_alloc failed\n");
321 oa->o_valid = OBD_MD_FLNOTOBD;
322 ll_from_inode(oa, inode);
324 /* XXX how do we know that this inode is now clean? */
325 printk("delete_inode ------> link %d\n", inode->i_nlink);
327 err = IOPS(inode, destroy)(IID(inode), oa);
331 printk(__FUNCTION__ ": obd_destroy fails (%d)\n", err);
337 } /* ll_delete_inode */
341 static int ll_attr2inode(struct inode * inode, struct iattr * attr)
343 unsigned int ia_valid = attr->ia_valid;
346 if (ia_valid & ATTR_SIZE) {
347 error = vmtruncate(inode, attr->ia_size);
352 if (ia_valid & ATTR_UID)
353 inode->i_uid = attr->ia_uid;
354 if (ia_valid & ATTR_GID)
355 inode->i_gid = attr->ia_gid;
356 if (ia_valid & ATTR_ATIME)
357 inode->i_atime = attr->ia_atime;
358 if (ia_valid & ATTR_MTIME)
359 inode->i_mtime = attr->ia_mtime;
360 if (ia_valid & ATTR_CTIME)
361 inode->i_ctime = attr->ia_ctime;
362 if (ia_valid & ATTR_MODE) {
363 inode->i_mode = attr->ia_mode;
364 if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID))
365 inode->i_mode &= ~S_ISGID;
371 int ll_setattr(struct dentry *de, struct iattr *attr)
373 struct inode *inode = de->d_inode;
378 if (IOPS(inode, setattr) == NULL) {
379 printk(KERN_ERR __FUNCTION__ ": no setattr method!\n");
385 printk(__FUNCTION__ ": obdo_alloc failed\n");
389 ll_attr2inode(inode, attr);
390 oa->o_id = inode->i_ino;
391 oa->o_mode = inode->i_mode;
392 obdo_from_iattr(oa, attr);
393 err = IOPS(inode, setattr)(IID(inode), oa);
396 printk(__FUNCTION__ ": obd_setattr fails (%d)\n", err);
405 static int ll_statfs(struct super_block *sb, struct statfs *buf)
412 err = OPS(sb,statfs)(ID(sb), &tmp);
414 printk(__FUNCTION__ ": obd_statfs fails (%d)\n", err);
417 memcpy(buf, &tmp, sizeof(*buf));
418 CDEBUG(D_SUPER, "statfs returns avail %ld\n", tmp.f_bavail);
424 static inline void ll_read_inode2(struct inode *inode, void *opaque)
426 struct mds_rep *rep = opaque;
429 ll_to_inode(inode, rep);
431 INIT_LIST_HEAD(ll_iplist(inode)); /* list of dirty pages on inode */
432 INIT_LIST_HEAD(ll_islist(inode)); /* list of inodes in superblock */
434 /* OIDEBUG(inode); */
436 if (S_ISREG(inode->i_mode)) {
437 inode->i_op = &ll_file_inode_operations;
438 inode->i_fop = &ll_file_operations;
439 inode->i_mapping->a_ops = &ll_aops;
441 } else if (S_ISDIR(inode->i_mode)) {
442 inode->i_op = &ll_dir_inode_operations;
443 inode->i_fop = &ll_dir_operations;
444 inode->i_mapping->a_ops = &ll_aops;
446 } else if (S_ISLNK(inode->i_mode)) {
447 if (inode->i_blocks) {
448 inode->i_op = &ll_symlink_inode_operations;
449 inode->i_mapping->a_ops = &ll_aops;
451 inode->i_op = &ll_fast_symlink_inode_operations;
455 init_special_inode(inode, inode->i_mode,
456 ((int *)ll_i2info(inode)->lli_inline)[0]);
463 /* exported operations */
464 struct super_operations ll_super_operations =
466 read_inode2: ll_read_inode2,
467 // put_inode: ll_put_inode,
468 // delete_inode: ll_delete_inode,
469 // put_super: ll_put_super,
475 struct file_system_type lustre_light_fs_type = {
476 "lustre_light", 0, ll_read_super, NULL
479 static int __init init_lustre_light(void)
481 printk(KERN_INFO "Lustre Light 0.0.1, braam@clusterfs.com\n");
483 return register_filesystem(&lustre_light_fs_type);
486 static void __exit exit_lustre_light(void)
488 unregister_filesystem(&lustre_light_fs_type);
491 MODULE_AUTHOR("Peter J. Braam <braam@clusterfs.com>");
492 MODULE_DESCRIPTION("Lustre Light Client File System v1.0");
493 MODULE_LICENSE("GPL");
495 module_init(init_lustre_light);
496 module_exit(exit_lustre_light);