2 * Lustre Light 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 extern struct address_space_operations ll_dir_aops;
41 struct super_operations ll_super_operations;
42 long ll_cache_count = 0;
43 long ll_mutex_start = 0;
46 static char *ll_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 ll_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 = ll_read_opt("device", this_char)))||
82 (!*vers && (*vers = ll_read_opt("version", this_char))) )
88 static struct super_block * ll_read_super(struct super_block *sb,
89 void *data, int silent)
91 struct inode *root = 0;
92 struct ll_sb_info *sbi = (struct ll_sb_info *)(&sb->u.generic_sbp);
93 struct obd_device *obddev;
101 struct mds_rep_hdr *hdr = NULL;
106 memset(sbi, 0, sizeof(*sbi));
108 CDEBUG(D_INFO, "\n");
109 ll_options(data, &device, &version);
111 printk(__FUNCTION__ ": no device\n");
116 devno = simple_strtoul(device, NULL, 0);
117 CDEBUG(D_INFO, "\n");
118 if ( devno >= MAX_OBD_DEVICES ) {
119 printk(__FUNCTION__ ": device of %s too high (%d)\n", device, devno);
124 CDEBUG(D_INFO, "\n");
126 obddev = &obd_dev[devno];
127 sbi->ll_conn.oc_dev = obddev;
128 CDEBUG(D_INFO, "\n");
130 err = obd_connect(&sbi->ll_conn);
131 CDEBUG(D_INFO, "\n");
133 printk("OBDFS: cannot connect to %s\n", device);
139 /* list of dirty inodes, and a mutex to hold while modifying it */
140 INIT_LIST_HEAD(&sbi->ll_inodes);
141 init_MUTEX (&sbi->ll_list_mutex);
146 sb->s_maxbytes = 1LL << 36;
147 printk("Max bytes: %Lx\n", sb->s_maxbytes);
148 sb->s_blocksize = PAGE_SIZE;
149 sb->s_blocksize_bits = (unsigned char)PAGE_SHIFT;
150 sb->s_magic = LL_SUPER_MAGIC;
151 sb->s_op = &ll_super_operations;
153 /* make root inode */
154 err = mdc_getattr(root_ino, S_IFDIR, OBD_MD_FLNOTOBD|OBD_MD_FLBLOCKS,
157 printk(__FUNCTION__ ": mds_getattr failed %d\n", err);
164 root = iget4(sb, root_ino, NULL, rep);
167 printk("lustre_light: bad iget4 for root\n");
174 sb->s_root = d_alloc_root(root);
175 OBD_FREE(device, strlen(device) + 1);
177 OBD_FREE(version, strlen(version) + 1);
184 OBD_FREE(device, strlen(device) + 1);
186 OBD_FREE(version, strlen(version) + 1);
188 obd_disconnect(&sbi->ll_conn);
191 sbi->ll_super = NULL;
198 } /* ll_read_super */
201 static void ll_put_super(struct super_block *sb)
203 struct ll_sb_info *sbi;
208 sbi = (struct ll_sb_info *) &sb->u.generic_sbp;
209 obd_disconnect(ID(sb));
211 printk(KERN_INFO "OBDFS: Bye bye.\n");
217 void ll_do_change_inode(struct inode *inode, int valid)
226 printk(__FUNCTION__ ": obdo_alloc failed\n");
231 oa->o_valid = OBD_MD_FLNOTOBD & (valid | OBD_MD_FLID);
232 ll_from_inode(oa, inode);
233 oa->o_mode = inode->i_mode;
234 err = obd_setattr(IID(inode), oa);
237 printk(__FUNCTION__ ": obd_setattr fails (%d)\n", err);
241 } /* ll_write_inode */
243 void ll_change_inode(struct inode *inode, int mask)
245 return ll_do_change_inode(inode, OBD_MD_FLNLINK);
249 extern void write_inode_pages(struct inode *);
250 /* This routine is called from iput() (for each unlink on the inode).
251 * We can't put this call into delete_inode() since that is called only
252 * when i_count == 0, and we need to keep a reference on the inode while
253 * it is in the page cache, which means i_count > 0. Catch 22.
255 static void ll_put_inode(struct inode *inode)
258 if (inode->i_nlink && (atomic_read(&inode->i_count) == 1)) {
259 write_inode_pages(inode);
264 //ll_dequeue_pages(inode);
269 static void ll_delete_inode(struct inode *inode)
271 ll_do_change_inode(inode, ~0);
280 if (IOPS(inode, destroy) == NULL) {
281 printk(KERN_ERR __FUNCTION__ ": no destroy method!\n");
288 printk(__FUNCTION__ ": obdo_alloc failed\n");
292 oa->o_valid = OBD_MD_FLNOTOBD;
293 ll_from_inode(oa, inode);
295 /* XXX how do we know that this inode is now clean? */
296 printk("delete_inode ------> link %d\n", inode->i_nlink);
298 err = IOPS(inode, destroy)(IID(inode), oa);
302 printk(__FUNCTION__ ": obd_destroy fails (%d)\n", err);
308 } /* ll_delete_inode */
312 static int ll_attr2inode(struct inode * inode, struct iattr * attr)
314 unsigned int ia_valid = attr->ia_valid;
317 if (ia_valid & ATTR_SIZE) {
318 error = vmtruncate(inode, attr->ia_size);
323 if (ia_valid & ATTR_UID)
324 inode->i_uid = attr->ia_uid;
325 if (ia_valid & ATTR_GID)
326 inode->i_gid = attr->ia_gid;
327 if (ia_valid & ATTR_ATIME)
328 inode->i_atime = attr->ia_atime;
329 if (ia_valid & ATTR_MTIME)
330 inode->i_mtime = attr->ia_mtime;
331 if (ia_valid & ATTR_CTIME)
332 inode->i_ctime = attr->ia_ctime;
333 if (ia_valid & ATTR_MODE) {
334 inode->i_mode = attr->ia_mode;
335 if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID))
336 inode->i_mode &= ~S_ISGID;
342 int ll_setattr(struct dentry *de, struct iattr *attr)
344 struct inode *inode = de->d_inode;
352 printk(__FUNCTION__ ": obdo_alloc failed\n");
356 ll_attr2inode(inode, attr);
357 oa->o_id = inode->i_ino;
358 oa->o_mode = inode->i_mode;
359 obdo_from_iattr(oa, attr);
360 err = obd_setattr(IID(inode), oa);
363 printk(__FUNCTION__ ": obd_setattr fails (%d)\n", err);
372 static int ll_statfs(struct super_block *sb, struct statfs *buf)
379 err = obd_statfs(ID(sb), &tmp);
381 printk(__FUNCTION__ ": obd_statfs fails (%d)\n", err);
384 memcpy(buf, &tmp, sizeof(*buf));
385 CDEBUG(D_SUPER, "statfs returns avail %ld\n", tmp.f_bavail);
391 static inline void ll_read_inode2(struct inode *inode, void *opaque)
393 struct mds_rep *rep = opaque;
396 ll_to_inode(inode, rep);
398 INIT_LIST_HEAD(ll_iplist(inode)); /* list of dirty pages on inode */
399 INIT_LIST_HEAD(ll_islist(inode)); /* list of inodes in superblock */
401 /* OIDEBUG(inode); */
403 if (S_ISREG(inode->i_mode)) {
404 inode->i_op = &ll_file_inode_operations;
405 inode->i_fop = &ll_file_operations;
406 inode->i_mapping->a_ops = &ll_aops;
408 } else if (S_ISDIR(inode->i_mode)) {
409 inode->i_op = &ll_dir_inode_operations;
410 inode->i_fop = &ll_dir_operations;
411 inode->i_mapping->a_ops = &ll_dir_aops;
413 } else if (S_ISLNK(inode->i_mode)) {
414 if (inode->i_blocks) {
415 inode->i_op = &ll_symlink_inode_operations;
416 inode->i_mapping->a_ops = &ll_aops;
418 inode->i_op = &ll_fast_symlink_inode_operations;
422 init_special_inode(inode, inode->i_mode,
423 ((int *)ll_i2info(inode)->lli_inline)[0]);
430 /* exported operations */
431 struct super_operations ll_super_operations =
433 read_inode2: ll_read_inode2,
434 // put_inode: ll_put_inode,
435 // delete_inode: ll_delete_inode,
436 put_super: ll_put_super,
440 struct file_system_type lustre_light_fs_type = {
441 "lustre_light", 0, ll_read_super, NULL
444 static int __init init_lustre_light(void)
446 printk(KERN_INFO "Lustre Light 0.0.1, braam@clusterfs.com\n");
448 return register_filesystem(&lustre_light_fs_type);
451 static void __exit exit_lustre_light(void)
453 unregister_filesystem(&lustre_light_fs_type);
456 MODULE_AUTHOR("Peter J. Braam <braam@clusterfs.com>");
457 MODULE_DESCRIPTION("Lustre Light Client File System v1.0");
458 MODULE_LICENSE("GPL");
460 module_init(init_lustre_light);
461 module_exit(exit_lustre_light);