1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
4 * linux/fs/obdfilter/filter.c
6 * Copyright (C) 2001, 2002 Cluster File Systems, Inc.
8 * This code is issued under the GNU General Public License.
9 * See the file COPYING in this distribution
11 * by Peter Braam <braam@clusterfs.com>
12 * and Andreas Dilger <adilger@clusterfs.com>
16 #define DEBUG_SUBSYSTEM S_FILTER
18 #include <linux/module.h>
19 #include <linux/pagemap.h>
21 #include <linux/dcache.h>
22 #include <linux/obd_class.h>
23 #include <linux/lustre_dlm.h>
24 #include <linux/obd_filter.h>
25 #include <linux/ext3_jbd.h>
26 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
27 #include <linux/extN_jbd.h>
29 #include <linux/quotaops.h>
30 #include <linux/init.h>
31 #include <linux/random.h>
32 #include <linux/stringify.h>
34 static kmem_cache_t *filter_open_cache;
35 static kmem_cache_t *filter_dentry_cache;
37 #define FILTER_ROOTINO 2
38 #define FILTER_ROOTINO_STR __stringify(FILTER_ROOTINO)
41 static char *obd_type_by_mode[S_IFMT >> S_SHIFT] = {
43 [S_IFREG >> S_SHIFT] "R",
44 [S_IFDIR >> S_SHIFT] "D",
45 [S_IFCHR >> S_SHIFT] "C",
46 [S_IFBLK >> S_SHIFT] "B",
47 [S_IFIFO >> S_SHIFT] "F",
48 [S_IFSOCK >> S_SHIFT] "S",
49 [S_IFLNK >> S_SHIFT] "L"
52 static inline const char *obd_mode_to_type(int mode)
54 return obd_type_by_mode[(mode & S_IFMT) >> S_SHIFT];
57 /* write the pathname into the string */
58 static int filter_id(char *buf, obd_id id, obd_mode mode)
60 return sprintf(buf, "O/%s/"LPU64, obd_mode_to_type(mode), id);
63 static inline void f_dput(struct dentry *dentry)
65 /* Can't go inside filter_ddelete because it can block */
66 CDEBUG(D_INODE, "putting %s: %p, count = %d\n",
67 dentry->d_name.name, dentry, atomic_read(&dentry->d_count) - 1);
68 LASSERT(atomic_read(&dentry->d_count) > 0);
73 /* Not racy w.r.t. others, because we are the only user of this dentry */
74 static void filter_drelease(struct dentry *dentry)
77 kmem_cache_free(filter_dentry_cache, dentry->d_fsdata);
80 struct dentry_operations filter_dops = {
81 .d_release = filter_drelease,
84 /* setup the object store with correct subdirectories */
85 static int filter_prep(struct obd_device *obd)
87 struct obd_run_ctxt saved;
88 struct filter_obd *filter = &obd->u.filter;
89 struct dentry *dentry;
97 push_ctxt(&saved, &filter->fo_ctxt, NULL);
98 dentry = simple_mkdir(current->fs->pwd, "O", 0700);
99 CDEBUG(D_INODE, "got/created O: %p\n", dentry);
100 if (IS_ERR(dentry)) {
101 rc = PTR_ERR(dentry);
102 CERROR("cannot open/create O: rc = %d\n", rc);
105 filter->fo_dentry_O = dentry;
106 dentry = simple_mkdir(current->fs->pwd, "P", 0700);
107 CDEBUG(D_INODE, "got/created P: %p\n", dentry);
108 if (IS_ERR(dentry)) {
109 rc = PTR_ERR(dentry);
110 CERROR("cannot open/create P: rc = %d\n", rc);
114 dentry = simple_mkdir(current->fs->pwd, "D", 0700);
115 CDEBUG(D_INODE, "got/created D: %p\n", dentry);
116 if (IS_ERR(dentry)) {
117 rc = PTR_ERR(dentry);
118 CERROR("cannot open/create D: rc = %d\n", rc);
122 root = simple_mknod(dentry, FILTER_ROOTINO_STR, S_IFREG | 0755);
126 CERROR("OBD filter: cannot open/create root %d: rc = %d\n",
133 * Create directories and/or get dentries for each object type.
134 * This saves us from having to do multiple lookups for each one.
136 for (mode = 0; mode < (S_IFMT >> S_SHIFT); mode++) {
137 char *type = obd_type_by_mode[mode];
140 filter->fo_dentry_O_mode[mode] = NULL;
143 dentry = simple_mkdir(filter->fo_dentry_O, type, 0700);
144 CDEBUG(D_INODE, "got/created O/%s: %p\n", type, dentry);
145 if (IS_ERR(dentry)) {
146 rc = PTR_ERR(dentry);
147 CERROR("cannot create O/%s: rc = %d\n", type, rc);
148 GOTO(out_O_mode, rc);
150 filter->fo_dentry_O_mode[mode] = dentry;
153 file = filp_open("D/status", O_RDWR | O_CREAT, 0700);
154 if ( !file || IS_ERR(file) ) {
156 CERROR("OBD filter: cannot open/create status %s: rc = %d\n",
158 GOTO(out_O_mode, rc);
161 /* steal operations */
162 inode = file->f_dentry->d_inode;
163 filter->fo_fop = file->f_op;
164 filter->fo_iop = inode->i_op;
165 filter->fo_aops = inode->i_mapping->a_ops;
167 if (inode->i_size == 0) {
168 __u64 disk_lastobjid = cpu_to_le64(lastobjid);
169 ssize_t retval = file->f_op->write(file,(char *)&disk_lastobjid,
170 sizeof(disk_lastobjid),
172 if (retval != sizeof(disk_lastobjid)) {
173 CDEBUG(D_INODE,"OBD filter: error writing lastobjid\n");
175 GOTO(out_O_mode, rc = -EIO);
178 __u64 disk_lastobjid;
179 ssize_t retval = file->f_op->read(file, (char *)&disk_lastobjid,
180 sizeof(disk_lastobjid),
182 if (retval != sizeof(disk_lastobjid)) {
183 CDEBUG(D_INODE,"OBD filter: error reading lastobjid\n");
185 GOTO(out_O_mode, rc = -EIO);
187 lastobjid = le64_to_cpu(disk_lastobjid);
189 filter->fo_lastobjid = lastobjid;
200 struct dentry *dentry = filter->fo_dentry_O_mode[mode];
203 filter->fo_dentry_O_mode[mode] = NULL;
207 f_dput(filter->fo_dentry_O);
208 filter->fo_dentry_O = NULL;
212 /* cleanup the filter: write last used object id to status file */
213 static void filter_post(struct obd_device *obd)
215 struct obd_run_ctxt saved;
216 struct filter_obd *filter = &obd->u.filter;
217 __u64 disk_lastobjid;
222 push_ctxt(&saved, &filter->fo_ctxt, NULL);
223 file = filp_open("D/status", O_RDWR | O_CREAT, 0700);
225 CERROR("OBD filter: cannot create status file\n");
230 disk_lastobjid = cpu_to_le64(filter->fo_lastobjid);
231 rc = file->f_op->write(file, (char *)&disk_lastobjid,
232 sizeof(disk_lastobjid), &file->f_pos);
233 if (rc != sizeof(disk_lastobjid))
234 CERROR("OBD filter: error writing lastobjid: rc = %ld\n", rc);
236 rc = filp_close(file, NULL);
238 CERROR("OBD filter: cannot close status file: rc = %ld\n", rc);
240 for (mode = 0; mode < (S_IFMT >> S_SHIFT); mode++) {
241 struct dentry *dentry = filter->fo_dentry_O_mode[mode];
244 filter->fo_dentry_O_mode[mode] = NULL;
247 f_dput(filter->fo_dentry_O);
253 static __u64 filter_next_id(struct obd_device *obd)
257 spin_lock(&obd->u.filter.fo_objidlock);
258 id = ++obd->u.filter.fo_lastobjid;
259 spin_unlock(&obd->u.filter.fo_objidock);
261 /* FIXME: write the lastobjid to disk here */
265 /* how to get files, dentries, inodes from object id's */
266 /* parent i_sem is already held if needed for exclusivity */
267 static struct dentry *filter_fid2dentry(struct obd_device *obd,
268 struct dentry *dparent,
269 __u64 id, __u32 type)
271 struct super_block *sb = obd->u.filter.fo_sb;
272 struct dentry *dchild;
277 if (!sb || !sb->s_dev) {
278 CERROR("fatal: device not initialized.\n");
279 RETURN(ERR_PTR(-ENXIO));
283 CERROR("fatal: invalid object #0\n");
285 RETURN(ERR_PTR(-ESTALE));
288 if (!(type & S_IFMT)) {
289 CERROR("OBD %s, object "LPU64" has bad type: %o\n",
290 __FUNCTION__, id, type);
291 RETURN(ERR_PTR(-EINVAL));
294 len = sprintf(name, LPU64, id);
295 CDEBUG(D_INODE, "opening object O/%s/%s\n", obd_mode_to_type(type),
297 dchild = lookup_one_len(name, dparent, len);
298 if (IS_ERR(dchild)) {
299 CERROR("child lookup error %ld\n", PTR_ERR(dchild));
304 dchild->d_op = &filter_dops;
306 LASSERT(dchild->d_op == &filter_dops);
308 CDEBUG(D_INODE, "got child obj O/%s/%s: %p, count = %d\n",
309 obd_mode_to_type(type), name, dchild,
310 atomic_read(&dchild->d_count));
312 LASSERT(atomic_read(&dchild->d_count) > 0);
317 static inline struct dentry *filter_parent(struct obd_device *obd,
320 struct filter_obd *filter = &obd->u.filter;
322 return filter->fo_dentry_O_mode[(mode & S_IFMT) >> S_SHIFT];
325 static struct file *filter_obj_open(struct obd_export *export,
326 __u64 id, __u32 type)
328 struct filter_obd *filter = &export->exp_obd->u.filter;
329 struct super_block *sb = filter->fo_sb;
330 struct filter_export_data *fed = &export->exp_filter_data;
331 struct filter_dentry_data *fdd;
332 struct filter_file_data *ffd;
333 struct obd_run_ctxt saved;
338 if (!sb || !sb->s_dev) {
339 CERROR("fatal: device not initialized.\n");
340 RETURN(ERR_PTR(-ENXIO));
344 CERROR("fatal: invalid obdo "LPU64"\n", id);
345 RETURN(ERR_PTR(-ESTALE));
348 if (!(type & S_IFMT)) {
349 CERROR("OBD %s, object "LPU64" has bad type: %o\n",
350 __FUNCTION__, id, type);
351 RETURN(ERR_PTR(-EINVAL));
354 ffd = kmem_cache_alloc(filter_open_cache, SLAB_KERNEL);
356 CERROR("obdfilter: out of memory\n");
357 RETURN(ERR_PTR(-ENOMEM));
360 /* We preallocate this to avoid blocking while holding fo_fddlock */
361 fdd = kmem_cache_alloc(filter_dentry_cache, SLAB_KERNEL);
363 CERROR("obdfilter: out of memory\n");
364 GOTO(out_ffd, file = ERR_PTR(-ENOMEM));
367 filter_id(name, id, type);
368 push_ctxt(&saved, &filter->fo_ctxt, NULL);
369 file = filp_open(name, O_RDONLY | O_LARGEFILE, 0 /* type? */);
375 spin_lock(&filter->fo_fddlock);
376 if (file->f_dentry->d_fsdata) {
377 spin_unlock(&filter->fo_fddlock);
378 kmem_cache_free(filter_dentry_cache, fdd);
379 fdd = file->f_dentry->d_fsdata;
380 LASSERT(kmem_cache_validate(filter_dentry_cache, fdd));
381 /* should only happen during client recovery */
382 if (fdd->fdd_flags & FILTER_FLAG_DESTROY)
383 CDEBUG(D_INODE,"opening destroyed object "LPX64"\n",id);
384 atomic_inc(&fdd->fdd_open_count);
386 atomic_set(&fdd->fdd_open_count, 1);
387 spin_lock_init(&fdd->fdd_lock);
389 /* If this is racy, then we can use {cmp}xchg and atomic_add */
390 file->f_dentry->d_fsdata = fdd;
391 spin_unlock(&filter->fo_fddlock);
394 get_random_bytes(&ffd->ffd_servercookie, sizeof(ffd->ffd_servercookie));
395 ffd->ffd_file = file;
396 file->private_data = ffd;
398 spin_lock(&fed->fed_lock);
399 list_add(&ffd->ffd_export_list, &fed->fed_open_head);
400 spin_unlock(&fed->fed_lock);
402 CDEBUG(D_INODE, "opening objid "LPX64": rc = %p\n", id, file);
408 kmem_cache_free(filter_dentry_cache, fdd);
410 ffd->ffd_servercookie = DEAD_HANDLE_MAGIC;
411 kmem_cache_free(filter_open_cache, ffd);
415 /* Caller must hold i_sem on dir_dentry->d_inode */
416 static int filter_destroy_internal(struct obd_device *obd,
417 struct dentry *dir_dentry,
418 struct dentry *object_dentry)
420 struct obd_run_ctxt saved;
421 struct inode *inode = object_dentry->d_inode;
424 if (inode->i_nlink != 1 || atomic_read(&inode->i_count) != 1) {
425 CERROR("destroying objid %*s nlink = %d, count = %d\n",
426 object_dentry->d_name.len,
427 object_dentry->d_name.name,
428 inode->i_nlink, atomic_read(&inode->i_count));
431 push_ctxt(&saved, &obd->u.filter.fo_ctxt, NULL);
432 rc = vfs_unlink(dir_dentry->d_inode, object_dentry);
433 /* XXX unlink from PENDING directory now too */
437 CERROR("error unlinking objid %*s: rc %d\n",
438 object_dentry->d_name.len,
439 object_dentry->d_name.name, rc);
444 static int filter_close_internal(struct obd_device *obd,
445 struct filter_file_data *ffd)
447 struct file *filp = ffd->ffd_file;
448 struct dentry *object_dentry = dget(filp->f_dentry);
449 struct filter_dentry_data *fdd = object_dentry->d_fsdata;
453 LASSERT(filp->private_data == ffd);
456 rc = filp_close(filp, 0);
458 if (atomic_dec_and_test(&fdd->fdd_open_count) &&
459 fdd->fdd_flags & FILTER_FLAG_DESTROY) {
460 struct dentry *dir_dentry = filter_parent(obd, S_IFREG);
462 down(&dir_dentry->d_inode->i_sem);
463 rc2 = filter_destroy_internal(obd, dir_dentry, object_dentry);
466 up(&dir_dentry->d_inode->i_sem);
469 f_dput(object_dentry);
470 kmem_cache_free(filter_open_cache, ffd);
476 static int filter_connect(struct lustre_handle *conn, struct obd_device *obd,
477 obd_uuid_t cluuid, struct recovd_obd *recovd,
478 ptlrpc_recovery_cb_t recover)
480 struct obd_export *exp;
485 rc = class_connect(conn, obd, cluuid);
488 exp = class_conn2export(conn);
491 INIT_LIST_HEAD(&exp->exp_filter_data.fed_open_head);
492 spin_lock_init(&exp->exp_filter_data.fed_lock);
501 static int filter_disconnect(struct lustre_handle *conn)
503 struct obd_export *exp = class_conn2export(conn);
504 struct filter_export_data *fed;
509 fed = &exp->exp_filter_data;
510 spin_lock(&exp->exp_filter_data);
511 while(!list_empty(&fed->fed_open_head)) {
512 struct filter_file_data *ffd;
514 ffd = list_entry(fed->fed_open_head.next, typeof(*ffd),
516 list_del(&ffd->ffd_export_list);
517 spin_unlock(&exp->exp_filter_data);
519 CERROR("force closing file %*s on disconnect\n",
520 ffd->ffd_file->f_dentry->d_name.len,
521 ffd->ffd_file->f_dentry->d_name.name);
523 filter_close_internal(exp->exp_obd, ffd);
524 spin_lock(&exp->exp_filter_data);
526 spin_unlock(&exp->exp_filter_data);
528 ldlm_cancel_locks_for_export(exp);
529 rc = class_disconnect(conn);
533 /* XXX cleanup preallocated inodes */
537 /* mount the file system (secretly) */
538 static int filter_setup(struct obd_device *obd, obd_count len, void *buf)
540 struct obd_ioctl_data* data = buf;
541 struct filter_obd *filter;
542 struct vfsmount *mnt;
546 if (!data->ioc_inlbuf1 || !data->ioc_inlbuf2)
550 mnt = do_kern_mount(data->ioc_inlbuf2, 0, data->ioc_inlbuf1, NULL);
555 filter = &obd->u.filter;;
556 filter->fo_vfsmnt = mnt;
557 filter->fo_fstype = strdup(data->ioc_inlbuf2);
558 filter->fo_sb = mnt->mnt_root->d_inode->i_sb;
559 CERROR("%s: mnt is %p\n", data->ioc_inlbuf1, filter->fo_vfsmnt);
560 /* XXX is this even possible if do_kern_mount succeeded? */
562 GOTO(err_kfree, err = -ENODEV);
564 OBD_SET_CTXT_MAGIC(&filter->fo_ctxt);
565 filter->fo_ctxt.pwdmnt = mnt;
566 filter->fo_ctxt.pwd = mnt->mnt_root;
567 filter->fo_ctxt.fs = get_ds();
569 err = filter_prep(obd);
571 GOTO(err_kfree, err);
572 spin_lock_init(&filter->fo_lock);
573 INIT_LIST_HEAD(&filter->fo_export_list);
576 ldlm_namespace_new("filter-tgt", LDLM_NAMESPACE_SERVER);
577 if (obd->obd_namespace == NULL)
580 ptlrpc_init_client(LDLM_REQUEST_PORTAL, LDLM_REPLY_PORTAL,
581 "filter_ldlm_client", &obd->obd_ldlm_client);
586 kfree(filter->fo_fstype);
588 mntput(filter->fo_vfsmnt);
598 static int filter_cleanup(struct obd_device *obd)
600 struct super_block *sb;
603 if (!list_empty(&obd->obd_exports)) {
604 CERROR("still has clients!\n");
605 class_disconnect_all(obd);
606 if (!list_empty(&obd->obd_exports)) {
607 CERROR("still has exports after forced cleanup?\n");
612 ldlm_namespace_free(obd->obd_namespace);
614 sb = obd->u.filter.fo_sb;
615 if (!obd->u.filter.fo_sb)
620 shrink_dcache_parent(sb->s_root);
622 mntput(obd->u.filter.fo_vfsmnt);
623 obd->u.filter.fo_sb = 0;
624 kfree(obd->u.filter.fo_fstype);
633 static void filter_from_inode(struct obdo *oa, struct inode *inode, int valid)
635 int type = oa->o_mode & S_IFMT;
638 CDEBUG(D_INFO, "src inode %ld (%p), dst obdo %ld valid 0x%08x\n",
639 inode->i_ino, inode, (long)oa->o_id, valid);
640 /* Don't copy the inode number in place of the object ID */
641 obdo_from_inode(oa, inode, valid);
642 oa->o_mode &= ~S_IFMT;
645 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
646 obd_rdev rdev = kdev_t_to_nr(inode->i_rdev);
648 oa->o_valid |= OBD_MD_FLRDEV;
654 static struct filter_file_data *filter_handle2ffd(struct lustre_handle *handle)
656 struct filter_file_data *ffd = NULL;
659 if (!handle || !handle->addr)
662 ffd = (struct filter_file_data *)(unsigned long)(handle->addr);
663 if (!kmem_cache_validate(filter_open_cache, (void *)ffd))
666 if (ffd->ffd_servercookie != handle->cookie)
669 LASSERT(ffd->ffd_file->private_data == ffd);
673 static struct dentry *__filter_oa2dentry(struct lustre_handle *conn,
674 struct obdo *oa, char *what)
676 struct dentry *dentry = NULL;
678 if (oa->o_valid & OBD_MD_FLHANDLE) {
679 struct lustre_handle *ost_handle = obdo_handle(oa);
680 struct filter_file_data *ffd = filter_handle2ffd(ost_handle);
683 dentry = dget(ffd->ffd_file->f_dentry);
687 struct obd_device *obd = class_conn2obd(conn);
689 CERROR("invalid client "LPX64"\n", conn->addr);
690 RETURN(ERR_PTR(-EINVAL));
692 dentry = filter_fid2dentry(obd, filter_parent(obd, oa->o_mode),
693 oa->o_id, oa->o_mode);
696 if (!dentry->d_inode) {
697 CERROR("%s on non-existent object: "LPU64"\n", what, oa->o_id);
699 dentry = ERR_PTR(-ENOENT);
705 #define filter_oa2dentry(conn, oa) __filter_oa2dentry(conn, oa, __FUNCTION__)
707 static int filter_getattr(struct lustre_handle *conn, struct obdo *oa,
708 struct lov_stripe_md *md)
710 struct dentry *dentry = NULL;
714 dentry = filter_oa2dentry(conn, oa);
716 RETURN(PTR_ERR(dentry));
718 filter_from_inode(oa, dentry->d_inode, oa->o_valid);
724 static int filter_setattr(struct lustre_handle *conn, struct obdo *oa,
725 struct lov_stripe_md *md)
727 struct obd_run_ctxt saved;
728 struct obd_device *obd = class_conn2obd(conn);
729 struct dentry *dentry;
735 dentry = filter_oa2dentry(conn, oa);
738 RETURN(PTR_ERR(dentry));
740 iattr_from_obdo(&iattr, oa, oa->o_valid);
741 iattr.ia_mode = (iattr.ia_mode & ~S_IFMT) | S_IFREG;
742 inode = dentry->d_inode;
745 if (iattr.ia_valid & ATTR_SIZE)
747 push_ctxt(&saved, &obd->u.filter.fo_ctxt, NULL);
748 if (inode->i_op->setattr)
749 rc = inode->i_op->setattr(dentry, &iattr);
751 rc = inode_setattr(inode, &iattr);
753 if (iattr.ia_valid & ATTR_SIZE) {
755 oa->o_valid = OBD_MD_FLBLOCKS | OBD_MD_FLCTIME | OBD_MD_FLMTIME;
756 obdo_from_inode(oa, inode, oa->o_valid);
764 static int filter_open(struct lustre_handle *conn, struct obdo *oa,
765 struct lov_stripe_md *ea)
767 struct obd_export *export;
768 struct lustre_handle *handle;
769 struct filter_file_data *ffd;
774 export = class_conn2export(conn);
776 CDEBUG(D_IOCTL, "fatal: invalid client "LPX64"\n", conn->addr);
780 filp = filter_obj_open(export, oa->o_id, oa->o_mode);
782 GOTO(out, rc = PTR_ERR(filp));
784 filter_from_inode(oa, filp->f_dentry->d_inode, oa->o_valid);
786 ffd = filp->private_data;
787 handle = obdo_handle(oa);
788 handle->addr = (__u64)(unsigned long)ffd;
789 handle->cookie = ffd->ffd_servercookie;
790 oa->o_valid |= OBD_MD_FLHANDLE;
795 static int filter_close(struct lustre_handle *conn, struct obdo *oa,
796 struct lov_stripe_md *ea)
798 struct obd_export *exp;
799 struct filter_file_data *ffd;
803 exp = class_conn2export(conn);
805 CDEBUG(D_IOCTL, "fatal: invalid client "LPX64"\n", conn->addr);
809 if (!(oa->o_valid & OBD_MD_FLHANDLE)) {
810 CERROR("no handle for close of objid "LPX64"\n", oa->o_id);
814 ffd = filter_handle2ffd(obdo_handle(oa));
816 struct lustre_handle *handle = obdo_handle(oa);
817 CERROR("bad handle ("LPX64") or cookie ("LPX64") for close\n",
818 handle->addr, handle->cookie);
822 spin_lock(&exp->exp_filter_data);
823 list_del(&ffd->ffd_export_list);
824 spin_unlock(&exp->exp_filter_data);
826 rc = filter_close_internal(exp->exp_obd, ffd);
831 static int filter_create(struct lustre_handle* conn, struct obdo *oa,
832 struct lov_stripe_md **ea)
834 struct obd_device *obd = class_conn2obd(conn);
836 struct obd_run_ctxt saved;
843 CERROR("invalid client "LPX64"\n", conn->addr);
847 if (!(oa->o_mode && S_IFMT)) {
848 CERROR("OBD %s, object "LPU64" has bad type: %o\n",
849 __FUNCTION__, oa->o_id, oa->o_mode);
853 oa->o_id = filter_next_id(obd);
855 //filter_id(name, oa->o_id, oa->o_mode);
856 sprintf(name, LPU64, oa->o_id);
857 push_ctxt(&saved, &obd->u.filter.fo_ctxt, NULL);
858 new = simple_mknod(filter_parent(obd, oa->o_mode), name, mode);
861 CERROR("Error mknod obj %s, err %ld\n", name, PTR_ERR(new));
865 /* Set flags for fields we have set in the inode struct */
866 oa->o_valid = OBD_MD_FLID | OBD_MD_FLBLKSZ | OBD_MD_FLBLOCKS |
867 OBD_MD_FLMTIME | OBD_MD_FLATIME | OBD_MD_FLCTIME;
868 filter_from_inode(oa, new->d_inode, oa->o_valid);
874 static int filter_destroy(struct lustre_handle *conn, struct obdo *oa,
875 struct lov_stripe_md *ea)
877 struct obd_device *obd = class_conn2obd(conn);
878 struct dentry *dir_dentry, *object_dentry;
883 CERROR("invalid client "LPX64"\n", conn->addr);
887 CDEBUG(D_INODE, "destroying object "LPD64"\n", oa->o_id);
889 dir_dentry = filter_parent(obd, oa->o_mode);
890 down(&dir_dentry->d_inode->i_sem);
892 object_dentry = filter_oa2dentry(conn, oa);
893 if (IS_ERR(object_dentry))
894 GOTO(out, rc = -ENOENT);
896 if (object_dentry->d_fsdata) {
897 struct filter_dentry_data *fdd = object_dentry->d_fsdata;
899 if (!(fdd->fdd_flags & FILTER_FLAG_DESTROY)) {
900 fdd->fdd_flags |= FILTER_FLAG_DESTROY;
901 /* XXX put into PENDING directory in case of crash */
903 GOTO(out_dput, rc = 0);
906 rc = filter_destroy_internal(obd, dir_dentry, object_dentry);
908 f_dput(object_dentry);
912 up(&dir_dentry->d_inode->i_sem);
916 /* NB count and offset are used for punch, but not truncate */
917 static int filter_truncate(struct lustre_handle *conn, struct obdo *oa,
918 struct lov_stripe_md *lsm,
919 obd_off start, obd_off end)
924 if (end != OBD_OBJECT_EOF)
925 CERROR("PUNCH not supported, only truncate works\n");
927 CDEBUG(D_INODE, "calling truncate for object "LPX64", valid = %x, "
928 "o_size = "LPD64"\n", oa->o_id, oa->o_valid, start);
930 error = filter_setattr(conn, oa, NULL);
934 static int filter_pgcache_brw(int cmd, struct lustre_handle *conn,
935 struct lov_stripe_md *lsm, obd_count oa_bufs,
936 struct brw_page *pga, brw_callback_t callback,
937 struct io_cb_data *data)
939 struct obd_export *export = class_conn2export(conn);
940 struct obd_run_ctxt saved;
941 struct super_block *sb;
942 int pnum; /* index to pages (bufs) */
943 unsigned long retval;
950 CDEBUG(D_IOCTL, "invalid client "LPX64"\n", conn->addr);
954 sb = export->exp_obd->u.filter.fo_sb;
955 push_ctxt(&saved, &export->exp_obd->u.filter.fo_ctxt, NULL);
956 pnum = 0; /* pnum indexes buf 0..num_pages */
958 file = filter_obj_open(export, lsm->lsm_object_id, S_IFREG);
960 GOTO(out, retval = PTR_ERR(file));
962 /* count doubles as retval */
963 for (pg = 0; pg < oa_bufs; pg++) {
964 CDEBUG(D_INODE, "OP %d obdo pgno: (%d) (%ld,"LPU64
965 ") off count ("LPU64",%d)\n",
966 cmd, pnum, file->f_dentry->d_inode->i_ino,
967 pga[pnum].off >> PAGE_CACHE_SHIFT, pga[pnum].off,
968 (int)pga[pnum].count);
969 if (cmd & OBD_BRW_WRITE) {
973 buffer = kmap(pga[pnum].pg);
974 retval = file->f_op->write(file, buffer,
977 kunmap(pga[pnum].pg);
978 CDEBUG(D_INODE, "retval %ld\n", retval);
980 loff_t off = pga[pnum].off;
981 char *buffer = kmap(pga[pnum].pg);
983 if (off >= file->f_dentry->d_inode->i_size) {
984 memset(buffer, 0, pga[pnum].count);
985 retval = pga[pnum].count;
987 retval = file->f_op->read(file, buffer,
988 pga[pnum].count, &off);
990 kunmap(pga[pnum].pg);
992 if (retval != pga[pnum].count) {
994 GOTO(out, retval = -EIO);
996 CDEBUG(D_INODE, "retval %ld\n", retval);
1000 /* sizes and blocks are set by generic_file_write */
1001 /* ctimes/mtimes will follow with a setattr call */
1002 filp_close(file, 0);
1004 /* XXX: do something with callback if it is set? */
1009 error = (retval >= 0) ? 0 : retval;
1014 * Calculate the number of buffer credits needed to write multiple pages in
1015 * a single ext3/extN transaction. No, this shouldn't be here, but as yet
1016 * ext3 doesn't have a nice API for calculating this sort of thing in advance.
1018 * See comment above ext3_writepage_trans_blocks for details. We assume
1019 * no data journaling is being done, but it does allow for all of the pages
1020 * being non-contiguous. If we are guaranteed contiguous pages we could
1021 * reduce the number of (d)indirect blocks a lot.
1023 * With N blocks per page and P pages, for each inode we have at most:
1025 * min(N*P, blocksize/4 + 1) dindirect blocks
1028 * For the entire filesystem, we have at most:
1029 * min(sum(nindir + P), ngroups) bitmap blocks (from the above)
1030 * min(sum(nindir + P), gdblocks) group descriptor blocks (from the above)
1033 * 2 * EXT3_SINGLEDATA_TRANS_BLOCKS for the quota files
1035 static int ext3_credits_needed(struct super_block *sb, int objcount,
1036 struct obd_ioobj *obj)
1038 struct obd_ioobj *o = obj;
1039 int blockpp = 1 << (PAGE_CACHE_SHIFT - sb->s_blocksize_bits);
1040 int addrpp = EXT3_ADDR_PER_BLOCK(sb) * blockpp;
1043 int needed = objcount + 1;
1046 for (i = 0; i < objcount; i++, o++) {
1047 int nblocks = o->ioo_bufcnt * blockpp;
1048 int ndindirect = min(nblocks, addrpp + 1);
1049 int nindir = nblocks + ndindirect + 1;
1051 nbitmaps += nindir + nblocks;
1052 ngdblocks += nindir + nblocks;
1057 /* Assumes ext3 and extN have same sb_info layout at the start. */
1058 if (nbitmaps > EXT3_SB(sb)->s_groups_count)
1059 nbitmaps = EXT3_SB(sb)->s_groups_count;
1060 if (ngdblocks > EXT3_SB(sb)->s_gdb_count)
1061 ngdblocks = EXT3_SB(sb)->s_gdb_count;
1063 needed += nbitmaps + ngdblocks;
1066 /* We assume that there will be 1 bit set in s_dquot.flags for each
1067 * quota file that is active. This is at least true for now.
1069 needed += hweight32(sb_any_quota_enabled(sb)) *
1070 EXT3_SINGLEDATA_TRANS_BLOCKS;
1076 /* We have to start a huge journal transaction here to hold all of the
1077 * metadata for the pages being written here. This is necessitated by
1078 * the fact that we do lots of prepare_write operations before we do
1079 * any of the matching commit_write operations, so even if we split
1080 * up to use "smaller" transactions none of them could complete until
1081 * all of them were opened. By having a single journal transaction,
1082 * we eliminate duplicate reservations for common blocks like the
1083 * superblock and group descriptors or bitmaps.
1085 * We will start the transaction here, but each prepare_write will
1086 * add a refcount to the transaction, and each commit_write will
1087 * remove a refcount. The transaction will be closed when all of
1088 * the pages have been written.
1090 static void *ext3_filter_journal_start(struct filter_obd *filter,
1091 int objcount, struct obd_ioobj *obj,
1092 int niocount, struct niobuf_remote *nb)
1094 journal_t *journal = NULL;
1095 handle_t *handle = NULL;
1098 /* It appears that some kernels have different values for
1099 * EXT*_MAX_GROUP_LOADED (either 8 or 32), so we cannot
1100 * assume anything after s_inode_bitmap_number is the same.
1102 if (!strcmp(filter->fo_fstype, "ext3"))
1103 journal = EXT3_SB(filter->fo_sb)->s_journal;
1104 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
1105 else if (!strcmp(filter->fo_fstype, "extN"))
1106 journal = EXTN_SB(filter->fo_sb)->s_journal;
1108 needed = ext3_credits_needed(filter->fo_sb, objcount, obj);
1110 /* The number of blocks we could _possibly_ dirty can very large.
1111 * We reduce our request if it is absurd (and we couldn't get that
1112 * many credits for a single handle anyways).
1114 * At some point we have to limit the size of I/Os sent at one time,
1115 * increase the size of the journal, or we have to calculate the
1116 * actual journal requirements more carefully by checking all of
1117 * the blocks instead of being maximally pessimistic. It remains to
1118 * be seen if this is a real problem or not.
1120 if (needed > journal->j_max_transaction_buffers) {
1121 CERROR("want too many journal credits (%d) using %d instead\n",
1122 needed, journal->j_max_transaction_buffers);
1123 needed = journal->j_max_transaction_buffers;
1127 handle = journal_start(journal, needed);
1130 CERROR("can't get handle for %d credits: rc = %ld\n", needed,
1136 static void *filter_journal_start(void **journal_save,
1137 struct filter_obd *filter,
1138 int objcount, struct obd_ioobj *obj,
1139 int niocount, struct niobuf_remote *nb)
1141 void *handle = NULL;
1143 /* This may not be necessary - we probably never have a
1144 * transaction started when we enter here, so we can
1145 * remove the saving of the journal state entirely.
1146 * For now leave it in just to see if it ever happens.
1148 *journal_save = current->journal_info;
1149 if (*journal_save) {
1150 CERROR("Already have handle %p???\n", *journal_save);
1152 current->journal_info = NULL;
1155 if (!strcmp(filter->fo_fstype, "ext3") ||
1156 !strcmp(filter->fo_fstype, "extN"))
1157 handle = ext3_filter_journal_start(filter, objcount, obj,
1162 static int ext3_filter_journal_stop(void *handle)
1166 /* We got a refcount on the handle for each call to prepare_write,
1167 * so we can drop the "parent" handle here to avoid the need for
1168 * osc to call back into filterobd to close the handle. The
1169 * remaining references will be dropped in commit_write.
1172 rc = journal_stop((handle_t *)handle);
1178 static int filter_journal_stop(void *journal_save, struct filter_obd *filter,
1183 if (!strcmp(filter->fo_fstype, "ext3") ||
1184 !strcmp(filter->fo_fstype, "extN"))
1185 rc = ext3_filter_journal_stop(handle);
1188 CERROR("error on journal stop: rc = %d\n", rc);
1190 current->journal_info = journal_save;
1195 static inline void lustre_put_page(struct page *page)
1198 page_cache_release(page);
1202 #ifndef PageUptodate
1203 #define PageUptodate(page) Page_Uptodate(page)
1205 static struct page *
1206 lustre_get_page_read(struct inode *inode,
1207 struct niobuf_remote *rnb)
1209 unsigned long index = rnb->offset >> PAGE_SHIFT;
1210 struct address_space *mapping = inode->i_mapping;
1214 page = read_cache_page(mapping, index,
1215 (filler_t*)mapping->a_ops->readpage, NULL);
1216 if (!IS_ERR(page)) {
1219 if (!PageUptodate(page)) {
1220 CERROR("page index %lu not uptodate\n", index);
1221 GOTO(err_page, rc = -EIO);
1223 if (PageError(page)) {
1224 CERROR("page index %lu has error\n", index);
1225 GOTO(err_page, rc = -EIO);
1231 lustre_put_page(page);
1235 static struct page *
1236 lustre_get_page_write(struct inode *inode, unsigned long index)
1238 struct address_space *mapping = inode->i_mapping;
1242 page = grab_cache_page(mapping, index); /* locked page */
1244 if (!IS_ERR(page)) {
1246 /* Note: Called with "O" and "PAGE_SIZE" this is essentially
1247 * a no-op for most filesystems, because we write the whole
1248 * page. For partial-page I/O this will read in the page.
1250 rc = mapping->a_ops->prepare_write(NULL, page, 0, PAGE_SIZE);
1252 CERROR("page index %lu, rc = %d\n", index, rc);
1255 GOTO(err_unlock, rc);
1257 /* XXX not sure if we need this if we are overwriting page */
1258 if (PageError(page)) {
1259 CERROR("error on page index %lu, rc = %d\n", index, rc);
1261 GOTO(err_unlock, rc = -EIO);
1268 lustre_put_page(page);
1272 static int lustre_commit_write(struct page *page, unsigned from, unsigned to)
1274 struct inode *inode = page->mapping->host;
1277 err = page->mapping->a_ops->commit_write(NULL, page, from, to);
1278 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
1279 if (!err && IS_SYNC(inode))
1280 err = waitfor_one_page(page);
1282 #warning ADD 2.5 waiting code here?
1284 //SetPageUptodate(page); // the client commit_write will do this
1286 SetPageReferenced(page);
1288 lustre_put_page(page);
1292 struct page *filter_get_page_write(struct inode *inode,
1293 struct niobuf_remote *rnb,
1294 struct niobuf_local *lnb, int *pglocked)
1296 unsigned long index = rnb->offset >> PAGE_SHIFT;
1297 struct address_space *mapping = inode->i_mapping;
1302 //ASSERT_PAGE_INDEX(index, GOTO(err, rc = -EINVAL));
1304 page = grab_cache_page_nowait(mapping, index); /* locked page */
1306 page = grab_cache_page(mapping, index); /* locked page */
1309 /* This page is currently locked, so get a temporary page instead. */
1310 /* XXX I believe this is a very dangerous thing to do - consider if
1311 * we had multiple writers for the same file (definitely the case
1312 * if we are using this codepath). If writer A locks the page,
1313 * writer B writes to a copy (as here), writer A drops the page
1314 * lock, and writer C grabs the lock before B does, then B will
1315 * later overwrite the data from C, even if C had LDLM locked
1316 * and initiated the write after B did.
1320 CDEBUG(D_PAGE, "ino %ld page %ld locked\n", inode->i_ino,index);
1321 addr = __get_free_pages(GFP_KERNEL, 0); /* locked page */
1323 CERROR("no memory for a temp page\n");
1325 GOTO(err, rc = -ENOMEM);
1328 memset((void *)addr, 0xBA, PAGE_SIZE);
1329 page = virt_to_page(addr);
1331 page->index = index;
1332 lnb->flags |= N_LOCAL_TEMP_PAGE;
1333 } else if (!IS_ERR(page)) {
1337 rc = mapping->a_ops->prepare_write(NULL, page,
1338 rnb->offset % PAGE_SIZE,
1341 CERROR("page index %lu, rc = %d\n", index, rc);
1344 GOTO(err_unlock, rc);
1346 /* XXX not sure if we need this if we are overwriting page */
1347 if (PageError(page)) {
1348 CERROR("error on page index %lu, rc = %d\n", index, rc);
1350 GOTO(err_unlock, rc = -EIO);
1357 lustre_put_page(page);
1363 * We need to balance prepare_write() calls with commit_write() calls.
1364 * If the page has been prepared, but we have no data for it, we don't
1365 * want to overwrite valid data on disk, but we still need to zero out
1366 * data for space which was newly allocated. Like part of what happens
1367 * in __block_prepare_write() for newly allocated blocks.
1369 * XXX currently __block_prepare_write() creates buffers for all the
1370 * pages, and the filesystems mark these buffers as BH_New if they
1371 * were newly allocated from disk. We use the BH_New flag similarly.
1373 static int filter_commit_write(struct page *page, unsigned from, unsigned to,
1376 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
1378 unsigned block_start, block_end;
1379 struct buffer_head *bh, *head = page->buffers;
1380 unsigned blocksize = head->b_size;
1381 void *addr = page_address(page);
1383 /* debugging: just seeing if this ever happens */
1384 CERROR("called filter_commit_write for obj %ld:%ld on err %d\n",
1385 page->index, page->mapping->host->i_ino, err);
1387 /* Currently one buffer per page, but in the future... */
1388 for (bh = head, block_start = 0; bh != head || !block_start;
1389 block_start = block_end, bh = bh->b_this_page) {
1390 block_end = block_start + blocksize;
1392 memset(addr + block_start, 0, blocksize);
1396 return lustre_commit_write(page, from, to);
1399 static int filter_preprw(int cmd, struct lustre_handle *conn,
1400 int objcount, struct obd_ioobj *obj,
1401 int niocount, struct niobuf_remote *nb,
1402 struct niobuf_local *res, void **desc_private)
1404 struct obd_run_ctxt saved;
1405 struct obd_device *obd;
1406 struct obd_ioobj *o = obj;
1407 struct niobuf_remote *rnb = nb;
1408 struct niobuf_local *lnb = res;
1409 void *journal_save = NULL;
1415 obd = class_conn2obd(conn);
1417 CDEBUG(D_IOCTL, "invalid client "LPX64"\n", conn->addr);
1420 memset(res, 0, sizeof(*res) * niocount);
1422 push_ctxt(&saved, &obd->u.filter.fo_ctxt, NULL);
1424 if (cmd & OBD_BRW_WRITE) {
1425 *desc_private = filter_journal_start(&journal_save,
1427 objcount, obj, niocount,
1429 if (IS_ERR(*desc_private))
1430 GOTO(out_ctxt, rc = PTR_ERR(*desc_private));
1433 for (i = 0; i < objcount; i++, o++) {
1434 struct dentry *dentry;
1435 struct inode *inode;
1438 dentry = filter_fid2dentry(obd, filter_parent(obd, S_IFREG),
1439 o->ioo_id, S_IFREG);
1441 GOTO(out_clean, rc = PTR_ERR(dentry));
1442 inode = dentry->d_inode;
1444 CERROR("trying to BRW to non-existent file "LPU64"\n",
1447 GOTO(out_clean, rc = -ENOENT);
1450 for (j = 0; j < o->ioo_bufcnt; j++, rnb++, lnb++) {
1454 lnb->dentry = dentry;
1456 lnb->dentry = dget(dentry);
1458 if (cmd & OBD_BRW_WRITE)
1459 page = filter_get_page_write(inode, rnb, lnb,
1462 page = lustre_get_page_read(inode, rnb);
1466 GOTO(out_clean, rc = PTR_ERR(page));
1469 lnb->addr = page_address(page);
1470 lnb->offset = rnb->offset;
1472 lnb->len = rnb->len;
1477 if (cmd & OBD_BRW_WRITE) {
1478 int err = filter_journal_stop(journal_save, &obd->u.filter,
1487 while (lnb-- > res) {
1488 CERROR("error cleanup on brw\n");
1489 f_dput(lnb->dentry);
1490 if (cmd & OBD_BRW_WRITE)
1491 filter_commit_write(lnb->page, 0, PAGE_SIZE, rc);
1493 lustre_put_page(lnb->page);
1498 static int filter_write_locked_page(struct niobuf_local *lnb)
1503 lpage = lustre_get_page_write(lnb->dentry->d_inode, lnb->page->index);
1504 if (IS_ERR(lpage)) {
1505 /* It is highly unlikely that we would ever get an error here.
1506 * The page we want to get was previously locked, so it had to
1507 * have already allocated the space, and we were just writing
1508 * over the same data, so there would be no hole in the file.
1510 * XXX: possibility of a race with truncate could exist, need
1511 * to check that. There are no guarantees w.r.t.
1512 * write order even on a local filesystem, although the
1513 * normal response would be to return the number of bytes
1514 * successfully written and leave the rest to the app.
1516 rc = PTR_ERR(lpage);
1517 CERROR("error getting locked page index %ld: rc = %d\n",
1518 lnb->page->index, rc);
1522 /* lpage is kmapped in lustre_get_page_write() above and kunmapped in
1523 * lustre_commit_write() below, lnb->page was kmapped previously in
1524 * filter_get_page_write() and kunmapped in lustre_put_page() below.
1526 memcpy(page_address(lpage), page_address(lnb->page), PAGE_SIZE);
1527 rc = lustre_commit_write(lpage, 0, PAGE_SIZE);
1529 CERROR("error committing locked page %ld: rc = %d\n",
1530 lnb->page->index, rc);
1532 lustre_put_page(lnb->page);
1537 static int filter_commitrw(int cmd, struct lustre_handle *conn,
1538 int objcount, struct obd_ioobj *obj,
1539 int niocount, struct niobuf_local *res,
1542 struct obd_run_ctxt saved;
1543 struct obd_ioobj *o;
1544 struct niobuf_local *r;
1545 struct obd_device *obd = class_conn2obd(conn);
1547 int found_locked = 0;
1552 push_ctxt(&saved, &obd->u.filter.fo_ctxt, NULL);
1554 journal_save = current->journal_info;
1555 LASSERT(!journal_save);
1557 current->journal_info = private;
1559 for (i = 0, o = obj, r = res; i < objcount; i++, o++) {
1561 for (j = 0 ; j < o->ioo_bufcnt ; j++, r++) {
1562 struct page *page = r->page;
1567 if (r->flags & N_LOCAL_TEMP_PAGE) {
1572 if (cmd & OBD_BRW_WRITE) {
1573 int err = filter_commit_write(page, 0,
1579 lustre_put_page(page);
1585 current->journal_info = journal_save;
1591 for (i = 0, o = obj, r = res; i < objcount; i++, o++) {
1593 for (j = 0 ; j < o->ioo_bufcnt ; j++, r++) {
1595 if (!(r->flags & N_LOCAL_TEMP_PAGE))
1598 err = filter_write_locked_page(r);
1610 static int filter_statfs(struct lustre_handle *conn, struct obd_statfs *osfs)
1612 struct obd_device *obd = class_conn2obd(conn);
1617 rc = vfs_statfs(obd->u.filter.fo_sb, &sfs);
1619 statfs_pack(osfs, &sfs);
1624 static int filter_get_info(struct lustre_handle *conn, obd_count keylen,
1625 void *key, obd_count *vallen, void **val)
1627 struct obd_device *obd;
1630 obd = class_conn2obd(conn);
1632 CDEBUG(D_IOCTL, "invalid client "LPX64"\n", conn->addr);
1636 if ( keylen == strlen("blocksize") &&
1637 memcmp(key, "blocksize", keylen) == 0 ) {
1638 *vallen = sizeof(long);
1639 *val = (void *)(long)obd->u.filter.fo_sb->s_blocksize;
1643 if ( keylen == strlen("blocksize_bits") &&
1644 memcmp(key, "blocksize_bits", keylen) == 0 ){
1645 *vallen = sizeof(long);
1646 *val = (void *)(long)obd->u.filter.fo_sb->s_blocksize_bits;
1650 if ( keylen == strlen("root_ino") &&
1651 memcmp(key, "root_ino", keylen) == 0 ){
1652 *vallen = sizeof(obd_id);
1653 *val = (void *)(obd_id)FILTER_ROOTINO;
1657 CDEBUG(D_IOCTL, "invalid key\n");
1661 int filter_copy_data(struct lustre_handle *dst_conn, struct obdo *dst,
1662 struct lustre_handle *src_conn, struct obdo *src,
1663 obd_size count, obd_off offset)
1666 struct lov_stripe_md srcmd, dstmd;
1667 unsigned long index = 0;
1670 memset(&srcmd, 0, sizeof(srcmd));
1671 memset(&dstmd, 0, sizeof(dstmd));
1672 srcmd.lsm_object_id = src->o_id;
1673 dstmd.lsm_object_id = dst->o_id;
1676 CDEBUG(D_INFO, "src: ino "LPU64" blocks "LPU64", size "LPU64
1677 ", dst: ino "LPU64"\n",
1678 src->o_id, src->o_blocks, src->o_size, dst->o_id);
1679 page = alloc_page(GFP_USER);
1683 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
1684 while (TryLockPage(page))
1685 ___wait_on_page(page);
1687 wait_on_page_locked(page);
1690 /* XXX with brw vector I/O, we could batch up reads and writes here,
1691 * all we need to do is allocate multiple pages to handle the I/Os
1692 * and arrays to handle the request parameters.
1694 while (index < ((src->o_size + PAGE_SIZE - 1) >> PAGE_SHIFT)) {
1696 struct io_cb_data *cbd = ll_init_cb();
1705 pg.count = PAGE_SIZE;
1706 pg.off = (page->index) << PAGE_SHIFT;
1709 page->index = index;
1710 err = obd_brw(OBD_BRW_READ, src_conn, &srcmd, 1, &pg,
1711 ll_sync_io_cb, cbd);
1724 pg.flag = OBD_BRW_CREATE;
1725 CDEBUG(D_INFO, "Read page %ld ...\n", page->index);
1727 err = obd_brw(OBD_BRW_WRITE, dst_conn, &dstmd, 1, &pg,
1728 ll_sync_io_cb, cbd);
1730 /* XXX should handle dst->o_size, dst->o_blocks here */
1736 CDEBUG(D_INFO, "Wrote page %ld ...\n", page->index);
1740 dst->o_size = src->o_size;
1741 dst->o_blocks = src->o_blocks;
1742 dst->o_valid |= OBD_MD_FLSIZE | OBD_MD_FLBLOCKS;
1750 static struct obd_ops filter_obd_ops = {
1751 o_get_info: filter_get_info,
1752 o_setup: filter_setup,
1753 o_cleanup: filter_cleanup,
1754 o_connect: filter_connect,
1755 o_disconnect: filter_disconnect,
1756 o_statfs: filter_statfs,
1757 o_getattr: filter_getattr,
1758 o_create: filter_create,
1759 o_setattr: filter_setattr,
1760 o_destroy: filter_destroy,
1761 o_open: filter_open,
1762 o_close: filter_close,
1763 o_brw: filter_pgcache_brw,
1764 o_punch: filter_truncate,
1765 o_preprw: filter_preprw,
1766 o_commitrw: filter_commitrw
1768 o_preallocate: filter_preallocate_inodes,
1769 o_migrate: filter_migrate,
1770 o_copy: filter_copy_data,
1771 o_iterate: filter_iterate
1776 static int __init obdfilter_init(void)
1778 printk(KERN_INFO "Filtering OBD driver v0.001, info@clusterfs.com\n");
1779 filter_open_cache = kmem_cache_create("ll_filter_fdata",
1780 sizeof(struct filter_file_data),
1782 if (!filter_open_cache)
1785 filter_dentry_cache = kmem_cache_create("ll_filter_dentry",
1786 sizeof(struct filter_dentry_data),
1788 if (!filter_dentry_cache) {
1789 kmem_cache_destroy(filter_open_cache);
1793 return class_register_type(&filter_obd_ops, OBD_FILTER_DEVICENAME);
1796 static void __exit obdfilter_exit(void)
1798 class_unregister_type(OBD_FILTER_DEVICENAME);
1799 if (kmem_cache_destroy(filter_dentry_cache))
1800 CERROR("couldn't free obdfilter dentry cache\n");
1801 if (kmem_cache_destroy(filter_open_cache))
1802 CERROR("couldn't free obdfilter open cache\n");
1805 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
1806 MODULE_DESCRIPTION("Lustre Filtering OBD driver v1.0");
1807 MODULE_LICENSE("GPL");
1809 module_init(obdfilter_init);
1810 module_exit(obdfilter_exit);