2 * linux/fs/ext2_obd/ext2_obd.c
4 * Copyright (C) 2001 Cluster File Systems, Inc.
6 * This code is issued under the GNU General Public License.
7 * See the file COPYING in this distribution
9 * by Peter Braam <braam@clusterfs.com>
14 #include <linux/version.h>
15 #include <linux/module.h>
17 #include <linux/stat.h>
18 #include <linux/locks.h>
19 #include <linux/ext2_fs.h>
20 #include <linux/quotaops.h>
21 #include <asm/unistd.h>
22 #include <linux/obd_support.h>
23 #include <linux/obd_class.h>
24 #include <linux/obd_ext2.h>
26 extern struct obd_device obd_dev[MAX_OBD_DEVICES];
29 #define FILTER_ROOTINO 2
33 static char * obd_type_by_mode[S_IFMT >> S_SHIFT] = {
35 [S_IFREG >> S_SHIFT] "R",
36 [S_IFDIR >> S_SHIFT] "D",
37 [S_IFCHR >> S_SHIFT] "C",
38 [S_IFBLK >> S_SHIFT] "B",
39 [S_IFIFO >> S_SHIFT] "F",
40 [S_IFSOCK >> S_SHIFT] "S",
41 [S_IFLNK >> S_SHIFT] "L"
44 static void filter_id(char *buf, obd_id id, obd_mode mode)
46 sprintf(buf, "O/%s/%Ld", obd_type_by_mode[(mode & S_IFMT) >> S_SHIFT],
50 static struct file *filter_parent(obd_id id, obd_mode mode)
54 sprintf(path, "O/%s", obd_type_by_mode[(mode & S_IFMT) >> S_SHIFT]);
56 file = filp_open(path, O_RDONLY, 0);
60 void push_ctxt(struct run_ctxt *save, struct run_ctxt *new)
63 save->pwd = dget(current->fs->pwd);
64 save->pwdmnt = mntget(current->fs->pwdmnt);
67 set_fs_pwd(current->fs, new->pwdmnt, new->pwd);
70 void pop_ctxt(struct run_ctxt *saved)
73 set_fs_pwd(current->fs, saved->pwdmnt, saved->pwd);
76 mntput(saved->pwdmnt);
79 static int simple_mkdir(struct dentry *dir, char *name, int mode)
81 struct dentry *dchild;
85 dchild = lookup_one_len(name, dir, strlen(name));
88 return PTR_ERR(dchild);
91 if (dchild->d_inode) {
97 err = vfs_mkdir(dir->d_inode, dchild, mode);
104 static int simple_unlink(struct dentry *dir, char *name)
106 struct dentry *dchild;
110 dchild = lookup_one_len(name, dir, strlen(name));
111 if (IS_ERR(dchild)) {
113 return PTR_ERR(dchild);
116 if (!dchild->d_inode) {
122 err = vfs_unlink(dir->d_inode, dchild);
129 static void filter_prep(struct obd_device *obddev)
131 struct run_ctxt saved;
139 push_ctxt(&saved, &obddev->u.filter.fo_ctxt);
140 rc = simple_mkdir(current->fs->pwd, "O", 0700);
141 rc = simple_mkdir(current->fs->pwd, "P", 0700);
142 rc = simple_mkdir(current->fs->pwd, "D", 0700);
143 file = filp_open("O", O_RDONLY, 0);
144 if (!file || IS_ERR(file)) {
145 printk(__FUNCTION__ ": cannot open O\n");
148 rc = simple_mkdir(file->f_dentry, "R", 0700); /* regular */
149 rc = simple_mkdir(file->f_dentry, "D", 0700); /* directory */
150 rc = simple_mkdir(file->f_dentry, "L", 0700); /* symbolic links */
151 rc = simple_mkdir(file->f_dentry, "C", 0700); /* character devices */
152 rc = simple_mkdir(file->f_dentry, "B", 0700); /* block devices */
153 rc = simple_mkdir(file->f_dentry, "F", 0700); /* fifo's */
154 rc = simple_mkdir(file->f_dentry, "S", 0700); /* sockets */
155 filp_close(file, NULL);
157 filter_id(rootid, FILTER_ROOTINO, S_IFDIR);
158 file = filp_open(rootid, O_RDWR | O_CREAT, 00755);
160 printk("OBD filter: cannot make root directory");
164 rc = simple_mkdir(current->fs->pwd, rootid, 0755);
166 file = filp_open("D/status", O_RDWR | O_CREAT, 0700);
167 if ( !file || IS_ERR(file) ) {
168 printk("OBD filter: cannot open/create status file\n");
172 /* steal operations */
173 inode = file->f_dentry->d_inode;
174 obddev->u.filter.fo_fop = file->f_op;
175 obddev->u.filter.fo_iop = inode->i_op;
176 obddev->u.filter.fo_aops = inode->i_mapping->a_ops;
179 if (inode->i_size == 0) {
180 rc = file->f_op->write(file, (char *)&lastino,
181 sizeof(lastino), &off);
182 if (rc != sizeof(lastino)) {
183 printk("OBD filter: error writing lastino\n");
187 rc = file->f_op->read(file, (char *)&lastino, sizeof(lastino),
189 if (rc != sizeof(lastino)) {
190 printk("OBD filter: error reading lastino\n");
194 obddev->u.filter.fo_lastino = lastino;
200 static void filter_post(struct obd_device *obddev)
202 struct run_ctxt saved;
207 push_ctxt(&saved, &obddev->u.filter.fo_ctxt);
208 file = filp_open("D/status", O_RDWR | O_CREAT, 0700);
209 if ( !file || IS_ERR(file)) {
210 printk("OBD filter: cannot create status file\n");
213 rc = file->f_op->write(file, (char *)&obddev->u.filter.fo_lastino,
214 sizeof(obddev->u.filter.fo_lastino), &off);
215 if (rc != sizeof(sizeof(obddev->u.filter.fo_lastino)) ) {
216 printk("OBD filter: error writing lastino\n");
219 rc = filp_close(file, NULL);
221 printk("OBD filter: cannot close status file\n");
228 /* release per client resources */
229 static int filter_disconnect(struct obd_conn *conn)
231 /* XXX cleanup preallocated inodes */
232 return gen_disconnect(conn);
233 } /* ext2obd_disconnect */
235 /* mount the file system (secretly) */
236 static int filter_setup(struct obd_device *obddev, obd_count len,
240 struct obd_ioctl_data* data = buf;
241 struct vfsmount *mnt;
246 mnt = do_kern_mount(data->ioc_inlbuf2, 0,
247 data->ioc_inlbuf1, NULL);
254 obddev->u.filter.fo_sb = mnt->mnt_root->d_inode->i_sb;
255 if (!obddev->u.filter.fo_sb) {
260 obddev->u.filter.fo_vfsmnt = mnt;
261 obddev->u.filter.fo_fstype = strdup(data->ioc_inlbuf2);
263 obddev->u.filter.fo_ctxt.pwdmnt = mnt;
264 obddev->u.filter.fo_ctxt.pwd = mnt->mnt_root;
265 obddev->u.filter.fo_ctxt.fs = KERNEL_DS;
268 spin_lock_init(&obddev->u.filter.fo_lock);
275 static __u64 filter_next_id(struct obd_device *obddev)
278 spin_lock(&obddev->u.filter.fo_lock);
279 obddev->u.filter.fo_lastino++;
280 id = obddev->u.filter.fo_lastino;
281 spin_unlock(&obddev->u.filter.fo_lock);
285 static int filter_cleanup(struct obd_device * obddev)
287 struct super_block *sb;
291 if ( !(obddev->obd_flags & OBD_SET_UP) ) {
296 if ( !list_empty(&obddev->obd_gen_clients) ) {
297 printk(KERN_WARNING __FUNCTION__ ": still has clients!\n");
302 sb = obddev->u.filter.fo_sb;
303 if (!obddev->u.filter.fo_sb){
310 mntput(obddev->u.filter.fo_vfsmnt);
311 obddev->u.filter.fo_sb = 0;
312 kfree(obddev->u.filter.fo_fstype);
322 static struct file *filter_obj_open(struct obd_device *obddev,
328 struct run_ctxt saved;
329 struct super_block *sb;
331 sb = obddev->u.filter.fo_sb;
332 if (!sb || !sb->s_dev) {
333 CDEBUG(D_SUPER, "fatal: device not initialized.\n");
339 CDEBUG(D_INODE, "fatal: invalid obdo %lu\n", (long)oa->o_id);
344 if ( ! (oa->o_mode & S_IFMT) ) {
345 printk("OBD filter_obj_open, no type (%Ld), mode %o!\n",
346 oa->o_id, oa->o_mode);
348 filter_id(id, oa->o_id, oa->o_mode);
349 push_ctxt(&saved, &obddev->u.filter.fo_ctxt);
350 file = filp_open(id , O_RDONLY | O_LARGEFILE, 0);
354 error = PTR_ERR(file);
357 CDEBUG(D_INODE, "opening obdo %s\n", id);
362 static struct inode *filter_inode_from_obdo(struct obd_device *obddev,
368 file = filter_obj_open(obddev, oa);
370 printk("filter_inode_from_obdo failed\n");
374 inode = iget(file->f_dentry->d_inode->i_sb, file->f_dentry->d_inode->i_ino);
379 static inline void filter_from_inode(struct obdo *oa, struct inode *inode)
381 int type = oa->o_mode & S_IFMT;
384 CDEBUG(D_INFO, "src inode %ld, dst obdo %ld valid 0x%08x\n",
385 inode->i_ino, (long)oa->o_id, oa->o_valid);
386 obdo_from_inode(oa, inode);
387 oa->o_mode &= ~S_IFMT;
390 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
391 obd_rdev rdev = kdev_t_to_nr(inode->i_rdev);
392 CDEBUG(D_INODE, "copying device %x from inode to obdo\n",
394 *((obd_rdev *)oa->o_inline) = rdev;
395 oa->o_obdflags |= OBD_FL_INLINEDATA;
396 oa->o_valid |= OBD_MD_FLINLINE;
400 else if (ext2obd_has_inline(inode)) {
401 CDEBUG(D_INFO, "copying inline from inode to obdo\n");
402 memcpy(oa->o_inline, inode->u.ext2_i.i_data,
403 MIN(sizeof(inode->u.ext2_i.i_data),OBD_INLINESZ));
404 oa->o_obdflags |= OBD_FL_INLINEDATA;
405 oa->o_valid |= OBD_MD_FLINLINE;
408 if (ext2obd_has_obdmd(inode)) {
409 /* XXX this will change when we don't store the obdmd in data */
410 CDEBUG(D_INFO, "copying obdmd from inode to obdo\n");
411 memcpy(oa->o_obdmd, inode->u.ext2_i.i_data,
412 MIN(sizeof(inode->u.ext2_i.i_data),OBD_INLINESZ));
413 oa->o_obdflags |= OBD_FL_OBDMDEXISTS;
414 oa->o_valid |= OBD_MD_FLOBDMD;
420 static int filter_getattr(struct obd_conn *conn, struct obdo *oa)
425 if ( !gen_client(conn) ) {
426 CDEBUG(D_IOCTL, "fatal: invalid client %u\n", conn->oc_id);
431 if ( !(inode = filter_inode_from_obdo(conn->oc_dev, oa)) ) {
436 oa->o_valid &= ~OBD_MD_FLID;
437 filter_from_inode(oa, inode);
444 static int filter_setattr(struct obd_conn *conn, struct obdo *oa)
451 if (!gen_client(conn)) {
452 CDEBUG(D_IOCTL, "invalid client %u\n", conn->oc_id);
456 inode = filter_inode_from_obdo(conn->oc_dev, oa);
462 iattr_from_obdo(&iattr, oa);
463 iattr.ia_mode &= ~S_IFMT;
464 iattr.ia_mode |= S_IFREG;
466 if ( inode->i_op->setattr ) {
467 rc = inode->i_op->setattr(&de, &iattr);
469 rc = inode_setattr(inode, &iattr);
477 static int filter_create (struct obd_conn* conn, struct obdo *oa)
480 struct run_ctxt saved;
483 struct obd_device *obddev = conn->oc_dev;
487 if (!gen_client(conn)) {
488 CDEBUG(D_IOCTL, "invalid client %u\n", conn->oc_id);
491 CDEBUG(D_IOCTL, "\n");
493 oa->o_id = filter_next_id(conn->oc_dev);
494 if ( !(oa->o_mode && S_IFMT) ) {
495 printk("filter obd: no type!\n");
499 filter_id(name, oa->o_id, oa->o_mode);
500 push_ctxt(&saved, &obddev->u.filter.fo_ctxt);
504 file = filp_open(name, O_RDONLY | O_CREAT, mode);
507 printk("Error mknod obj %s, err %ld\n", name, PTR_ERR(file));
511 CDEBUG(D_IOCTL, "\n");
513 /* Set flags for fields we have set in ext2_new_inode */
514 oa->o_valid |= OBD_MD_FLID | OBD_MD_FLBLKSZ | OBD_MD_FLBLOCKS |
515 OBD_MD_FLMTIME | OBD_MD_FLATIME | OBD_MD_FLCTIME |
516 OBD_MD_FLUID | OBD_MD_FLGID;
520 static int filter_destroy(struct obd_conn *conn, struct obdo *oa)
522 struct obd_device * obddev;
523 struct obd_client * cli;
524 struct inode * inode;
527 struct run_ctxt saved;
530 if (!(cli = gen_client(conn))) {
531 CDEBUG(D_IOCTL, "invalid client %u\n", conn->oc_id);
536 obddev = conn->oc_dev;
537 inode = filter_inode_from_obdo(obddev, oa);
545 inode->i_mode = 010000;
548 filter_id(id, oa->o_id, oa->o_mode);
549 push_ctxt(&saved, &obddev->u.filter.fo_ctxt);
550 dir = filter_parent(oa->o_id, oa->o_mode);
551 if (!dir || IS_ERR(dir)) {
555 rc = simple_unlink(dir->f_dentry, id);
564 static int filter_truncate(struct obd_conn *conn, struct obdo *oa, obd_size count,
569 error = filter_setattr(conn, oa);
570 oa->o_valid = OBD_MD_FLBLOCKS | OBD_MD_FLCTIME | OBD_MD_FLMTIME;
576 /* buffer must lie in user memory here */
577 static int filter_read(struct obd_conn *conn, struct obdo *oa, char *buf,
578 obd_size *count, obd_off offset)
581 unsigned long retval;
584 if (!gen_client(conn)) {
585 CDEBUG(D_IOCTL, "invalid client %u\n", conn->oc_id);
590 file = filter_obj_open(conn->oc_dev, oa);
591 if (!file || IS_ERR(file)) {
593 return -PTR_ERR(file);
596 /* count doubles as retval */
597 retval = file->f_op->read(file, buf, *count, &offset);
612 /* buffer must lie in user memory here */
613 static int filter_write(struct obd_conn *conn, struct obdo *oa, char *buf,
614 obd_size *count, obd_off offset)
618 unsigned long retval;
621 if (!gen_client(conn)) {
622 CDEBUG(D_IOCTL, "invalid client %u\n", conn->oc_id);
627 file = filter_obj_open(conn->oc_dev, oa);
628 if (!file || IS_ERR(file)) {
630 return -PTR_ERR(file);
633 /* count doubles as retval */
634 retval = file->f_op->write(file, buf, *count, &offset);
648 } /* ext2obd_write */
650 static int filter_pgcache_brw(int rw, struct obd_conn *conn,
659 struct super_block *sb;
661 int onum; /* index to oas */
662 int pnum; /* index to pages (bufs) */
663 unsigned long retval;
669 if (!gen_client(conn)) {
670 CDEBUG(D_IOCTL, "invalid client %u\n", conn->oc_id);
675 sb = conn->oc_dev->u.filter.fo_sb;
679 pnum = 0; /* pnum indexes buf 0..num_pages */
680 for (onum = 0; onum < num_oa; onum++) {
683 file = filter_obj_open(conn->oc_dev, oa[onum]);
684 if (!file || IS_ERR(file)) {
690 /* count doubles as retval */
691 for (pg = 0; pg < oa_bufs[onum]; pg++) {
692 CDEBUG(D_INODE, "OP %d obdo no/pno: (%d,%d) (%ld,%ld) off count (%Ld,%Ld)\n",
693 rw, onum, pnum, file->f_dentry->d_inode->i_ino,
694 (unsigned long)offset[pnum] >> PAGE_CACHE_SHIFT,
695 offset[pnum], count[pnum]);
700 buffer = kmap(pages[pnum]);
701 retval = file->f_op->write(file, buffer, count[pnum], &off);
703 CDEBUG(D_INODE, "retval %ld\n", retval);
705 loff_t off = offset[pnum];
706 char *buffer = kmap(pages[pnum]);
708 if (off >= file->f_dentry->d_inode->i_size) {
709 memset(buffer, 0, count[pnum]);
710 retval = count[pnum];
712 retval = file->f_op->read(file, buffer, count[pnum], &off);
716 if ( retval != count[pnum] ) {
722 CDEBUG(D_INODE, "retval %ld\n", retval);
726 /* sizes and blocks are set by generic_file_write */
727 /* ctimes/mtimes will follow with a setattr call */
734 error = (retval >= 0) ? 0 : retval;
738 static int filter_statfs (struct obd_conn *conn, struct statfs * statfs)
740 struct super_block *sb;
745 if (!gen_client(conn)) {
746 CDEBUG(D_IOCTL, "invalid client %u\n", conn->oc_id);
751 sb = conn->oc_dev->u.filter.fo_sb;
753 err = sb->s_op->statfs(sb, statfs);
756 } /* ext2obd_statfs */
759 static int filter_get_info(struct obd_conn *conn, obd_count keylen,
760 void *key, obd_count *vallen, void **val)
762 struct obd_device *obddev;
763 struct obd_client * cli;
766 if (!(cli = gen_client(conn))) {
767 CDEBUG(D_IOCTL, "invalid client %u\n", conn->oc_id);
771 obddev = conn->oc_dev;
773 if ( keylen == strlen("blocksize") &&
774 memcmp(key, "blocksize", keylen) == 0 ) {
775 *vallen = sizeof(int);
776 *val = (void *)obddev->u.filter.fo_sb->s_blocksize;
781 if ( keylen == strlen("blocksize_bits") &&
782 memcmp(key, "blocksize_bits", keylen) == 0 ){
783 *vallen = sizeof(int);
784 *val = (void *)(int)obddev->u.filter.fo_sb->s_blocksize_bits;
789 if ( keylen == strlen("root_ino") &&
790 memcmp(key, "root_ino", keylen) == 0 ){
791 *vallen = sizeof(int);
792 *val = (void *)(int) FILTER_ROOTINO;
797 CDEBUG(D_IOCTL, "invalid key\n");
802 struct obd_ops filter_obd_ops = {
804 o_get_info: filter_get_info,
805 o_setup: filter_setup,
806 o_cleanup: filter_cleanup,
807 o_connect: gen_connect,
808 o_disconnect: filter_disconnect,
809 o_statfs: filter_statfs,
810 o_getattr: filter_getattr,
811 o_create: filter_create,
812 o_setattr: filter_setattr,
813 o_destroy: filter_destroy,
815 o_write: filter_write,
816 o_brw: filter_pgcache_brw,
817 o_punch: filter_truncate,
819 o_preallocate: ext2obd_preallocate_inodes,
820 o_migrate: ext2obd_migrate,
821 o_copy: gen_copy_data,
822 o_iterate: ext2obd_iterate
827 static int __init obdfilter_init(void)
829 printk(KERN_INFO "Filtering OBD driver v0.001, braam@clusterfs.com\n");
830 return obd_register_type(&filter_obd_ops, OBD_FILTER_DEVICENAME);
833 static void __exit obdfilter_exit(void)
835 obd_unregister_type(OBD_FILTER_DEVICENAME);
838 MODULE_AUTHOR("Peter J. Braam <braam@clusterfs.com>");
839 MODULE_DESCRIPTION("Lustre Filtering OBD driver v1.0");
840 MODULE_LICENSE("GPL");
842 module_init(obdfilter_init);
843 module_exit(obdfilter_exit);