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 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");
125 obddev = &obd_dev[devno];
126 sbi->ll_obd = obddev;
127 sbi->ll_ops = sbi->ll_obd->obd_type->typ_ops;
128 sbi->ll_conn.oc_dev = obddev;
129 CDEBUG(D_INFO, "\n");
131 err = obd_connect(&sbi->ll_conn);
132 CDEBUG(D_INFO, "\n");
134 printk("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->ll_inodes);
143 init_MUTEX (&sbi->ll_list_mutex);
145 CDEBUG(D_INFO, "\n");
149 CDEBUG(D_INFO, "\n");
150 sb->s_maxbytes = 1LL << 36;
151 printk("Max bytes: %Lx\n", sb->s_maxbytes);
152 sb->s_blocksize = PAGE_SIZE;
153 sb->s_blocksize_bits = (unsigned char)PAGE_SHIFT;
154 sb->s_magic = LL_SUPER_MAGIC;
155 sb->s_op = &ll_super_operations;
157 /* make root inode */
158 CDEBUG(D_INFO, "\n");
159 err = mdc_getattr(root_ino, S_IFDIR, OBD_MD_FLNOTOBD|OBD_MD_FLBLOCKS,
162 printk(__FUNCTION__ ": mds_getattr failed %d\n", err);
170 CDEBUG(D_INFO, "mode %o\n", rep->mode);
171 CDEBUG(D_INFO, "\n");
172 root = iget4(sb, root_ino, NULL, rep);
174 CDEBUG(D_INFO, "\n");
176 printk("OBDFS: bad iget4 for root\n");
183 sb->s_root = d_alloc_root(root);
184 // list_add(&sbi->ll_list, &ll_super_list);
185 OBD_FREE(device, strlen(device) + 1);
187 OBD_FREE(version, strlen(version) + 1);
194 OBD_FREE(device, strlen(device) + 1);
196 OBD_FREE(version, strlen(version) + 1);
198 sbi->ll_ops->o_disconnect(&sbi->ll_conn);
201 sbi->ll_super = NULL;
208 } /* ll_read_super */
211 static void ll_put_super(struct super_block *sb)
213 struct ll_sb_info *sbi;
218 sbi = (struct ll_sb_info *) &sb->u.generic_sbp;
219 //ll_flush_reqs(&sbi->ll_inodes, ~0UL);
221 OPS(sb,disconnect)(ID(sb));
222 list_del(&sbi->ll_list);
224 printk(KERN_INFO "OBDFS: Bye bye.\n");
231 void ll_do_change_inode(struct inode *inode, int valid)
237 if (IOPS(inode, setattr) == NULL) {
238 printk(KERN_ERR __FUNCTION__ ": no setattr method!\n");
244 printk(__FUNCTION__ ": obdo_alloc failed\n");
249 oa->o_valid = OBD_MD_FLNOTOBD & (valid | OBD_MD_FLID);
250 ll_from_inode(oa, inode);
251 oa->o_mode = inode->i_mode;
252 err = IOPS(inode, setattr)(IID(inode), oa);
255 printk(__FUNCTION__ ": obd_setattr fails (%d)\n", err);
259 } /* ll_write_inode */
261 void ll_change_inode(struct inode *inode, int mask)
263 return ll_do_change_inode(inode, OBD_MD_FLNLINK);
267 extern void write_inode_pages(struct inode *);
268 /* This routine is called from iput() (for each unlink on the inode).
269 * We can't put this call into delete_inode() since that is called only
270 * when i_count == 0, and we need to keep a reference on the inode while
271 * it is in the page cache, which means i_count > 0. Catch 22.
273 static void ll_put_inode(struct inode *inode)
276 if (inode->i_nlink && (atomic_read(&inode->i_count) == 1)) {
277 write_inode_pages(inode);
282 //ll_dequeue_pages(inode);
287 static void ll_delete_inode(struct inode *inode)
289 ll_do_change_inode(inode, ~0);
298 if (IOPS(inode, destroy) == NULL) {
299 printk(KERN_ERR __FUNCTION__ ": no destroy method!\n");
306 printk(__FUNCTION__ ": obdo_alloc failed\n");
310 oa->o_valid = OBD_MD_FLNOTOBD;
311 ll_from_inode(oa, inode);
313 /* XXX how do we know that this inode is now clean? */
314 printk("delete_inode ------> link %d\n", inode->i_nlink);
316 err = IOPS(inode, destroy)(IID(inode), oa);
320 printk(__FUNCTION__ ": obd_destroy fails (%d)\n", err);
326 } /* ll_delete_inode */
330 static int ll_attr2inode(struct inode * inode, struct iattr * attr)
332 unsigned int ia_valid = attr->ia_valid;
335 if (ia_valid & ATTR_SIZE) {
336 error = vmtruncate(inode, attr->ia_size);
341 if (ia_valid & ATTR_UID)
342 inode->i_uid = attr->ia_uid;
343 if (ia_valid & ATTR_GID)
344 inode->i_gid = attr->ia_gid;
345 if (ia_valid & ATTR_ATIME)
346 inode->i_atime = attr->ia_atime;
347 if (ia_valid & ATTR_MTIME)
348 inode->i_mtime = attr->ia_mtime;
349 if (ia_valid & ATTR_CTIME)
350 inode->i_ctime = attr->ia_ctime;
351 if (ia_valid & ATTR_MODE) {
352 inode->i_mode = attr->ia_mode;
353 if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID))
354 inode->i_mode &= ~S_ISGID;
360 int ll_setattr(struct dentry *de, struct iattr *attr)
362 struct inode *inode = de->d_inode;
367 if (IOPS(inode, setattr) == NULL) {
368 printk(KERN_ERR __FUNCTION__ ": no setattr method!\n");
374 printk(__FUNCTION__ ": obdo_alloc failed\n");
378 ll_attr2inode(inode, attr);
379 oa->o_id = inode->i_ino;
380 oa->o_mode = inode->i_mode;
381 obdo_from_iattr(oa, attr);
382 err = IOPS(inode, setattr)(IID(inode), oa);
385 printk(__FUNCTION__ ": obd_setattr fails (%d)\n", err);
394 static int ll_statfs(struct super_block *sb, struct statfs *buf)
401 err = OPS(sb,statfs)(ID(sb), &tmp);
403 printk(__FUNCTION__ ": obd_statfs fails (%d)\n", err);
406 memcpy(buf, &tmp, sizeof(*buf));
407 CDEBUG(D_SUPER, "statfs returns avail %ld\n", tmp.f_bavail);
413 static inline void ll_read_inode2(struct inode *inode, void *opaque)
415 struct mds_rep *rep = opaque;
418 ll_to_inode(inode, rep);
420 INIT_LIST_HEAD(ll_iplist(inode)); /* list of dirty pages on inode */
421 INIT_LIST_HEAD(ll_islist(inode)); /* list of inodes in superblock */
423 /* OIDEBUG(inode); */
425 if (S_ISREG(inode->i_mode)) {
426 inode->i_op = &ll_file_inode_operations;
427 inode->i_fop = &ll_file_operations;
428 inode->i_mapping->a_ops = &ll_aops;
430 } else if (S_ISDIR(inode->i_mode)) {
431 inode->i_op = &ll_dir_inode_operations;
432 inode->i_fop = &ll_dir_operations;
433 inode->i_mapping->a_ops = &ll_aops;
435 } else if (S_ISLNK(inode->i_mode)) {
436 if (inode->i_blocks) {
437 inode->i_op = &ll_symlink_inode_operations;
438 inode->i_mapping->a_ops = &ll_aops;
440 inode->i_op = &ll_fast_symlink_inode_operations;
444 init_special_inode(inode, inode->i_mode,
445 ((int *)ll_i2info(inode)->lli_inline)[0]);
452 /* exported operations */
453 struct super_operations ll_super_operations =
455 read_inode2: ll_read_inode2,
456 // put_inode: ll_put_inode,
457 // delete_inode: ll_delete_inode,
458 // put_super: ll_put_super,
464 struct file_system_type lustre_light_fs_type = {
465 "lustre_light", 0, ll_read_super, NULL
468 static int __init init_lustre_light(void)
470 printk(KERN_INFO "Lustre Light 0.0.1, braam@clusterfs.com\n");
472 return register_filesystem(&lustre_light_fs_type);
475 static void __exit exit_lustre_light(void)
477 unregister_filesystem(&lustre_light_fs_type);
480 MODULE_AUTHOR("Peter J. Braam <braam@clusterfs.com>");
481 MODULE_DESCRIPTION("Lustre Light Client File System v1.0");
482 MODULE_LICENSE("GPL");
484 module_init(init_lustre_light);
485 module_exit(exit_lustre_light);