1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
4 * linux/fs/obdfilter/filter_io.c
6 * Copyright (c) 2001-2003 Cluster File Systems, Inc.
7 * Author: Peter Braam <braam@clusterfs.com>
8 * Author: Andreas Dilger <adilger@clusterfs.com>
9 * Author: Phil Schwan <phil@clusterfs.com>
11 * This file is part of Lustre, http://www.lustre.org.
13 * Lustre is free software; you can redistribute it and/or
14 * modify it under the terms of version 2 of the GNU General Public
15 * License as published by the Free Software Foundation.
17 * Lustre is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with Lustre; if not, write to the Free Software
24 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
27 #define DEBUG_SUBSYSTEM S_FILTER
29 #include <linux/config.h>
30 #include <linux/module.h>
31 #include <linux/pagemap.h> // XXX kill me soon
32 #include <linux/version.h>
34 #include <linux/obd_class.h>
35 #include <linux/lustre_fsfilt.h>
36 #include <linux/lustre_smfs.h>
37 #include <linux/lustre_snap.h>
38 #include "filter_internal.h"
40 int *obdfilter_created_scratchpad;
42 static int filter_alloc_dio_page(struct obd_device *obd, struct inode *inode,
43 struct niobuf_local *lnb)
49 page = alloc_pages(GFP_HIGHUSER, 0);
51 CERROR("no memory for a temp page\n");
57 POISON_PAGE(page, 0xf1);
58 if (lnb->len != PAGE_SIZE) {
59 memset(kmap(page) + lnb->len, 0, PAGE_SIZE - lnb->len);
63 page->index = lnb->offset >> PAGE_SHIFT;
70 void filter_free_dio_pages(int objcount, struct obd_ioobj *obj,
71 int niocount, struct niobuf_local *res)
75 for (i = 0; i < objcount; i++, obj++) {
76 for (j = 0 ; j < obj->ioo_bufcnt ; j++, res++) {
77 if (res->page != NULL) {
78 __free_page(res->page);
85 /* Grab the dirty and seen grant announcements from the incoming obdo.
86 * We will later calculate the clients new grant and return it.
87 * Caller must hold osfs lock */
88 static void filter_grant_incoming(struct obd_export *exp, struct obdo *oa)
90 struct filter_export_data *fed;
91 struct obd_device *obd = exp->exp_obd;
92 static unsigned long last_msg;
93 static int last_count;
97 LASSERT_SPIN_LOCKED(&obd->obd_osfs_lock);
99 if ((oa->o_valid & (OBD_MD_FLBLOCKS|OBD_MD_FLGRANT)) !=
100 (OBD_MD_FLBLOCKS|OBD_MD_FLGRANT)) {
101 oa->o_valid &= ~OBD_MD_FLGRANT;
106 fed = &exp->exp_filter_data;
108 /* Don't print this to the console the first time it happens, since
109 * it can happen legitimately on occasion, but only rarely. */
110 if (time_after(jiffies, last_msg + 60 * HZ)) {
114 if ((last_count & (-last_count)) == last_count)
118 /* Add some margin, since there is a small race if other RPCs arrive
119 * out-or-order and have already consumed some grant. We want to
120 * leave this here in case there is a large error in accounting. */
121 CDEBUG(oa->o_grant > fed->fed_grant + FILTER_GRANT_CHUNK ? mask:D_CACHE,
122 "%s: cli %s/%p reports grant: "LPU64" dropped: %u, local: %lu\n",
123 obd->obd_name, exp->exp_client_uuid.uuid, exp, oa->o_grant,
124 oa->o_dropped, fed->fed_grant);
126 /* Update our accounting now so that statfs takes it into account.
127 * Note that fed_dirty is only approximate and can become incorrect
128 * if RPCs arrive out-of-order. No important calculations depend
129 * on fed_dirty however. */
130 obd->u.filter.fo_tot_dirty += oa->o_dirty - fed->fed_dirty;
131 if (fed->fed_grant < oa->o_dropped) {
132 CERROR("%s: cli %s/%p reports %u dropped > fed_grant %lu\n",
133 obd->obd_name, exp->exp_client_uuid.uuid, exp,
134 oa->o_dropped, fed->fed_grant);
137 if (obd->u.filter.fo_tot_granted < oa->o_dropped) {
138 CERROR("%s: cli %s/%p reports %u dropped > tot_grant "LPU64"\n",
139 obd->obd_name, exp->exp_client_uuid.uuid, exp,
140 oa->o_dropped, obd->u.filter.fo_tot_granted);
143 obd->u.filter.fo_tot_granted -= oa->o_dropped;
144 fed->fed_grant -= oa->o_dropped;
145 fed->fed_dirty = oa->o_dirty;
149 #define GRANT_FOR_LLOG(obd) 16
151 /* Figure out how much space is available between what we've granted
152 * and what remains in the filesystem. Compensate for ext3 indirect
153 * block overhead when computing how much free space is left ungranted.
155 * Caller must hold obd_osfs_lock. */
156 obd_size filter_grant_space_left(struct obd_export *exp)
158 struct obd_device *obd = exp->exp_obd;
159 int blockbits = obd->u.filter.fo_sb->s_blocksize_bits;
160 obd_size tot_granted = obd->u.filter.fo_tot_granted, avail, left = 0;
161 int rc, statfs_done = 0;
163 LASSERT_SPIN_LOCKED(&obd->obd_osfs_lock);
165 if (time_before(obd->obd_osfs_age, jiffies - HZ)) {
167 rc = fsfilt_statfs(obd, obd->u.filter.fo_sb, jiffies + 1);
168 if (rc) /* N.B. statfs can't really fail */
173 avail = obd->obd_osfs.os_bavail;
174 left = avail - (avail >> (blockbits - 3)); /* (d)indirect */
175 if (left > GRANT_FOR_LLOG(obd)) {
176 left = (left - GRANT_FOR_LLOG(obd)) << blockbits;
178 left = 0 /* << blockbits */;
181 if (!statfs_done && left < 32 * FILTER_GRANT_CHUNK + tot_granted) {
182 CDEBUG(D_CACHE, "fs has no space left and statfs too old\n");
186 if (left >= tot_granted) {
189 static unsigned long next;
190 if (left < tot_granted - obd->u.filter.fo_tot_pending &&
191 time_after(jiffies, next)) {
192 spin_unlock(&obd->obd_osfs_lock);
193 CERROR("%s: cli %s/%p grant "LPU64" > available "
194 LPU64" and pending "LPU64"\n", obd->obd_name,
195 exp->exp_client_uuid.uuid, exp, tot_granted,
196 left, obd->u.filter.fo_tot_pending);
198 portals_debug_dumplog();
199 next = jiffies + 20 * HZ;
200 spin_lock(&obd->obd_osfs_lock);
205 CDEBUG(D_CACHE, "%s: cli %s/%p free: "LPU64" avail: "LPU64" grant "LPU64
206 " left: "LPU64" pending: "LPU64"\n", obd->obd_name,
207 exp->exp_client_uuid.uuid, exp,
208 obd->obd_osfs.os_bfree << blockbits, avail << blockbits,
209 tot_granted, left, obd->u.filter.fo_tot_pending);
214 /* Calculate how much grant space to allocate to this client, based on how
215 * much space is currently free and how much of that is already granted.
217 * Caller must hold obd_osfs_lock. */
218 long filter_grant(struct obd_export *exp, obd_size current_grant,
219 obd_size want, obd_size fs_space_left)
221 struct obd_device *obd = exp->exp_obd;
222 struct filter_export_data *fed = &exp->exp_filter_data;
223 int blockbits = obd->u.filter.fo_sb->s_blocksize_bits;
226 LASSERT_SPIN_LOCKED(&obd->obd_osfs_lock);
228 /* Grant some fraction of the client's requested grant space so that
229 * they are not always waiting for write credits (not all of it to
230 * avoid overgranting in face of multiple RPCs in flight). This
231 * essentially will be able to control the OSC_MAX_RIF for a client.
233 * If we do have a large disparity between what the client thinks it
234 * has and what we think it has, don't grant very much and let the
235 * client consume its grant first. Either it just has lots of RPCs
236 * in flight, or it was evicted and its grants will soon be used up. */
237 if (current_grant < want &&
238 current_grant < fed->fed_grant + FILTER_GRANT_CHUNK) {
239 grant = min((want >> blockbits) / 2,
240 (fs_space_left >> blockbits) / 8);
244 if (grant > FILTER_GRANT_CHUNK)
245 grant = FILTER_GRANT_CHUNK;
247 obd->u.filter.fo_tot_granted += grant;
248 fed->fed_grant += grant;
252 CDEBUG(D_CACHE,"%s: cli %s/%p wants: "LPU64" granting: "LPU64"\n",
253 obd->obd_name, exp->exp_client_uuid.uuid, exp, want, grant);
255 "%s: cli %s/%p tot cached:"LPU64" granted:"LPU64
256 " num_exports: %d\n", obd->obd_name, exp->exp_client_uuid.uuid,
257 exp, obd->u.filter.fo_tot_dirty,
258 obd->u.filter.fo_tot_granted, obd->obd_num_exports);
263 static int filter_preprw_read(int cmd, struct obd_export *exp, struct obdo *oa,
264 int objcount, struct obd_ioobj *obj,
265 int niocount, struct niobuf_remote *nb,
266 struct niobuf_local *res,
267 struct obd_trans_info *oti,
268 struct lustre_capa *capa)
270 struct obd_device *obd = exp->exp_obd;
271 struct lvfs_run_ctxt saved;
272 struct niobuf_remote *rnb;
273 struct niobuf_local *lnb;
274 struct dentry *dentry = NULL;
277 int rc = 0, i, tot_bytes = 0;
278 unsigned long now = jiffies;
281 /* We are currently not supporting multi-obj BRW_READ RPCS at all.
282 * When we do this function's dentry cleanup will need to be fixed */
283 LASSERTF(objcount == 1, "%d\n", objcount);
284 LASSERTF(obj->ioo_bufcnt > 0, "%d\n", obj->ioo_bufcnt);
286 if (oa && oa->o_valid & OBD_MD_FLGRANT) {
287 spin_lock(&obd->obd_osfs_lock);
288 filter_grant_incoming(exp, oa);
291 spin_unlock(&obd->obd_osfs_lock);
294 memset(res, 0, niocount * sizeof(*res));
296 push_ctxt(&saved, &exp->exp_obd->obd_lvfs_ctxt, NULL);
297 rc = filter_alloc_iobuf(OBD_BRW_READ, obj->ioo_bufcnt, &iobuf);
301 dentry = filter_id2dentry(obd, NULL, oa->o_gr, oa->o_id);
303 GOTO(cleanup, rc = PTR_ERR(dentry));
305 inode = dentry->d_inode;
308 rc = filter_verify_fid(exp, inode, capa);
313 fsfilt_check_slow(now, obd_timeout, "preprw_read setup");
315 for (i = 0, lnb = res, rnb = nb; i < obj->ioo_bufcnt;
317 lnb->dentry = dentry;
318 lnb->offset = rnb->offset;
320 lnb->flags = rnb->flags;
322 if ((inode && inode->i_size <= rnb->offset) || inode == NULL)
324 * if there's no more data, abort early. lnb->page == *
325 * NULL and lnb->rc == 0, so it's easy to detect later.
329 rc = filter_alloc_dio_page(obd, inode, lnb);
331 CDEBUG(rc == -ENOSPC ? D_INODE : D_ERROR,
332 "page err %u@"LPU64" %u/%u %p: rc %d\n",
333 lnb->len, lnb->offset, i, obj->ioo_bufcnt,
338 if (inode->i_size < lnb->offset + lnb->len - 1)
339 lnb->rc = inode->i_size - lnb->offset;
343 tot_bytes += lnb->rc;
345 filter_iobuf_add_page(obd, iobuf, inode, lnb->page);
348 fsfilt_check_slow(now, obd_timeout, "start_page_read");
351 rc = filter_direct_io(OBD_BRW_READ, dentry, iobuf,
352 exp, NULL, NULL, NULL);
357 lprocfs_counter_add(obd->obd_stats,
358 LPROC_FILTER_READ_BYTES, tot_bytes);
359 filter_tally_read(&exp->exp_obd->u.filter, res, niocount);
364 filter_free_dio_pages(objcount, obj,
367 * in other cases (no errors) dentry is released in
368 * filter_commitrw_read().
374 filter_free_iobuf(iobuf);
376 pop_ctxt(&saved, &exp->exp_obd->obd_lvfs_ctxt, NULL);
379 CERROR("io error %d\n", rc);
384 /* When clients have dirtied as much space as they've been granted they
385 * fall through to sync writes. These sync writes haven't been expressed
386 * in grants and need to error with ENOSPC when there isn't room in the
387 * filesystem for them after grants are taken into account. However,
388 * writeback of the dirty data that was already granted space can write
391 * Caller must hold obd_osfs_lock. */
392 static int filter_grant_check(struct obd_export *exp, int objcount,
393 struct fsfilt_objinfo *fso, int niocount,
394 struct niobuf_remote *rnb,
395 struct niobuf_local *lnb, obd_size *left,
398 struct filter_export_data *fed = &exp->exp_filter_data;
399 int blocksize = exp->exp_obd->u.filter.fo_sb->s_blocksize;
400 unsigned long used = 0, ungranted = 0, using;
401 int i, rc = -ENOSPC, obj, n = 0, mask = D_CACHE;
403 LASSERT_SPIN_LOCKED(&exp->exp_obd->obd_osfs_lock);
405 for (obj = 0; obj < objcount; obj++) {
406 for (i = 0; i < fso[obj].fso_bufcnt; i++, n++) {
409 /* should match code in osc_exit_cache() */
411 bytes += rnb[n].offset & (blocksize - 1);
412 tmp = (rnb[n].offset + rnb[n].len) & (blocksize - 1);
414 bytes += blocksize - tmp;
416 if (rnb[n].flags & OBD_BRW_FROM_GRANT) {
417 if (fed->fed_grant < used + bytes) {
419 "%s: cli %s/%p claims %ld+%d "
420 "GRANT, real grant %lu idx %d\n",
421 exp->exp_obd->obd_name,
422 exp->exp_client_uuid.uuid, exp,
423 used, bytes, fed->fed_grant, n);
427 rnb[n].flags |= OBD_BRW_GRANTED;
428 lnb[n].lnb_grant_used = bytes;
429 CDEBUG(0, "idx %d used=%lu\n", n, used);
434 if (*left > ungranted) {
435 /* if enough space, pretend it was granted */
437 rnb[n].flags |= OBD_BRW_GRANTED;
438 CDEBUG(0, "idx %d ungranted=%lu\n",n,ungranted);
443 /* We can't check for already-mapped blocks here, as
444 * it requires dropping the osfs lock to do the bmap.
445 * Instead, we return ENOSPC and in that case we need
446 * to go through and verify if all of the blocks not
447 * marked BRW_GRANTED are already mapped and we can
448 * ignore this error. */
450 rnb[n].flags &= OBD_BRW_GRANTED;
451 CDEBUG(D_CACHE,"%s: cli %s/%p idx %d no space for %d\n",
452 exp->exp_obd->obd_name,
453 exp->exp_client_uuid.uuid, exp, n, bytes);
457 /* Now substract what client have used already. We don't subtract
458 * this from the tot_granted yet, so that other client's can't grab
459 * that space before we have actually allocated our blocks. That
460 * happens in filter_grant_commit() after the writes are done. */
462 fed->fed_grant -= used;
463 fed->fed_pending += used;
464 exp->exp_obd->u.filter.fo_tot_pending += used;
467 "%s: cli %s/%p used: %lu ungranted: %lu grant: %lu dirty: %lu\n",
468 exp->exp_obd->obd_name, exp->exp_client_uuid.uuid, exp, used,
469 ungranted, fed->fed_grant, fed->fed_dirty);
471 /* Rough calc in case we don't refresh cached statfs data */
472 using = (used + ungranted + 1 ) >>
473 exp->exp_obd->u.filter.fo_sb->s_blocksize_bits;
474 if (exp->exp_obd->obd_osfs.os_bavail > using)
475 exp->exp_obd->obd_osfs.os_bavail -= using;
477 exp->exp_obd->obd_osfs.os_bavail = 0;
479 if (fed->fed_dirty < used) {
480 CERROR("%s: cli %s/%p claims used %lu > fed_dirty %lu\n",
481 exp->exp_obd->obd_name, exp->exp_client_uuid.uuid, exp,
482 used, fed->fed_dirty);
483 used = fed->fed_dirty;
485 exp->exp_obd->u.filter.fo_tot_dirty -= used;
486 fed->fed_dirty -= used;
488 if (fed->fed_dirty < 0 || fed->fed_grant < 0 || fed->fed_pending < 0) {
489 CERROR("%s: cli %s/%p dirty %ld pend %ld grant %ld\n",
490 exp->exp_obd->obd_name, exp->exp_client_uuid.uuid, exp,
491 fed->fed_dirty, fed->fed_pending, fed->fed_grant);
492 spin_unlock(&exp->exp_obd->obd_osfs_lock);
498 /* If we ever start to support multi-object BRW RPCs, we will need to get locks
499 * on mulitple inodes. That isn't all, because there still exists the
500 * possibility of a truncate starting a new transaction while holding the ext3
501 * rwsem = write while some writes (which have started their transactions here)
502 * blocking on the ext3 rwsem = read => lock inversion.
504 * The handling gets very ugly when dealing with locked pages. It may be easier
505 * to just get rid of the locked page code (which has problems of its own) and
506 * either discover we do not need it anymore (i.e. it was a symptom of another
507 * bug) or ensure we get the page locks in an appropriate order. */
508 static int filter_preprw_write(int cmd, struct obd_export *exp, struct obdo *oa,
509 int objcount, struct obd_ioobj *obj,
510 int niocount, struct niobuf_remote *nb,
511 struct niobuf_local *res,
512 struct obd_trans_info *oti,
513 struct lustre_capa *capa)
515 int rc = 0, i, tot_bytes = 0, cleanup_phase = 0;
516 struct obd_device *obd = exp->exp_obd;
517 struct niobuf_local *lnb = res;
518 struct dentry *dentry = NULL;
519 unsigned long now = jiffies;
520 struct lvfs_run_ctxt saved;
521 struct niobuf_remote *rnb;
522 struct fsfilt_objinfo fso;
529 LASSERT(objcount == 1);
530 LASSERT(obj->ioo_bufcnt > 0);
532 memset(res, 0, niocount * sizeof(*res));
534 rc = filter_alloc_iobuf(OBD_BRW_READ, obj->ioo_bufcnt, &iobuf);
540 push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
542 uid = oa->o_valid & OBD_MD_FLUID ? oa->o_uid : 0;
543 gid = oa->o_valid & OBD_MD_FLGID ? oa->o_gid : 0;
545 /* make sure that object is already allocated */
546 dentry = filter_crow_object(obd, oa);
548 GOTO(cleanup, rc = PTR_ERR(dentry));
550 rc = filter_verify_fid(exp, dentry->d_inode, capa);
556 fso.fso_dentry = dentry;
557 fso.fso_bufcnt = obj->ioo_bufcnt;
559 fsfilt_check_slow(now, obd_timeout, "preprw_write setup");
561 spin_lock(&obd->obd_osfs_lock);
563 filter_grant_incoming(exp, oa);
567 left = filter_grant_space_left(exp);
569 rc = filter_grant_check(exp, objcount, &fso, niocount, nb, res,
570 &left, dentry->d_inode);
571 if (oa && oa->o_valid & OBD_MD_FLGRANT)
572 oa->o_grant = filter_grant(exp,oa->o_grant,oa->o_undirty,left);
574 /* We're finishing using body->oa as an input variable, so reset
578 spin_unlock(&obd->obd_osfs_lock);
583 for (i = 0, rnb = nb, lnb = res; i < obj->ioo_bufcnt;
585 /* We still set up for ungranted pages so that granted pages
586 * can be written to disk as they were promised, and portals
587 * needs to keep the pages all aligned properly. */
588 lnb->dentry = dentry;
589 lnb->offset = rnb->offset;
591 lnb->flags = rnb->flags;
593 rc = filter_alloc_dio_page(obd, dentry->d_inode,lnb);
595 CERROR("page err %u@"LPU64" %u/%u %p: rc %d\n",
596 lnb->len, lnb->offset,
597 i, obj->ioo_bufcnt, dentry, rc);
602 /* If the filter writes a partial page, then has the file
603 * extended, the client will read in the whole page. the
604 * filter has to be careful to zero the rest of the partial
605 * page on disk. we do it by hand for partial extending
606 * writes, send_bio() is responsible for zeroing pages when
607 * asked to read unmapped blocks -- brw_kiovec() does this. */
608 if (lnb->len != PAGE_SIZE) {
609 if (lnb->offset + lnb->len < dentry->d_inode->i_size) {
610 filter_iobuf_add_page(obd, iobuf, dentry->d_inode,
613 memset(kmap(lnb->page) + lnb->len, 0,
614 PAGE_SIZE - lnb->len);
619 tot_bytes += lnb->len;
622 rc = filter_direct_io(OBD_BRW_READ, dentry, iobuf, exp,
625 fsfilt_check_slow(now, obd_timeout, "start_page_write");
627 lprocfs_counter_add(obd->obd_stats, LPROC_FILTER_WRITE_BYTES,
631 switch(cleanup_phase) {
634 filter_free_dio_pages(objcount, obj, niocount, res);
636 pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
637 filter_free_iobuf(iobuf);
639 if (rc && dentry && !IS_ERR(dentry))
643 spin_lock(&obd->obd_osfs_lock);
645 filter_grant_incoming(exp, oa);
646 spin_unlock(&obd->obd_osfs_lock);
647 pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
648 filter_free_iobuf(iobuf);
656 int filter_preprw(int cmd, struct obd_export *exp, struct obdo *oa,
657 int objcount, struct obd_ioobj *obj, int niocount,
658 struct niobuf_remote *nb, struct niobuf_local *res,
659 struct obd_trans_info *oti, struct lustre_capa *capa)
663 rc = filter_verify_capa(cmd, exp, capa);
667 if (cmd == OBD_BRW_WRITE)
668 return filter_preprw_write(cmd, exp, oa, objcount, obj,
669 niocount, nb, res, oti, capa);
671 if (cmd == OBD_BRW_READ)
672 return filter_preprw_read(cmd, exp, oa, objcount, obj,
673 niocount, nb, res, oti, capa);
679 void filter_release_read_page(struct filter_obd *filter, struct inode *inode,
685 (inode->i_size > filter->fo_readcache_max_filesize))
688 /* drop from cache like truncate_list_pages() */
689 if (drop && !TryLockPage(page)) {
691 ll_truncate_complete_page(page);
694 page_cache_release(page);
697 static int filter_commitrw_read(struct obd_export *exp, struct obdo *oa,
698 int objcount, struct obd_ioobj *obj,
699 int niocount, struct niobuf_local *res,
700 struct obd_trans_info *oti, int rc)
702 struct inode *inode = NULL;
705 if (res->dentry != NULL)
706 inode = res->dentry->d_inode;
708 filter_free_dio_pages(objcount, obj, niocount, res);
710 if (res->dentry != NULL)
715 void flip_into_page_cache(struct inode *inode, struct page *new_page)
717 struct page *old_page;
721 /* the dlm is protecting us from read/write concurrency, so we
722 * expect this find_lock_page to return quickly. even if we
723 * race with another writer it won't be doing much work with
724 * the page locked. we do this 'cause t_c_p expects a
725 * locked page, and it wants to grab the pagecache lock
727 old_page = find_lock_page(inode->i_mapping, new_page->index);
729 ll_truncate_complete_page(old_page);
730 unlock_page(old_page);
731 page_cache_release(old_page);
734 #if 0 /* this should be a /proc tunable someday */
735 /* racing o_directs (no locking ioctl) could race adding
736 * their pages, so we repeat the page invalidation unless
737 * we successfully added our new page */
738 rc = add_to_page_cache_unique(new_page, inode->i_mapping,
740 page_hash(inode->i_mapping,
743 /* add_to_page_cache clears uptodate|dirty and locks
745 SetPageUptodate(new_page);
746 unlock_page(new_page);
754 void filter_grant_commit(struct obd_export *exp, int niocount,
755 struct niobuf_local *res)
757 struct filter_obd *filter = &exp->exp_obd->u.filter;
758 struct niobuf_local *lnb = res;
759 unsigned long pending = 0;
762 spin_lock(&exp->exp_obd->obd_osfs_lock);
763 for (i = 0, lnb = res; i < niocount; i++, lnb++)
764 pending += lnb->lnb_grant_used;
766 LASSERTF(exp->exp_filter_data.fed_pending >= pending,
767 "%s: cli %s/%p fed_pending: %lu grant_used: %lu\n",
768 exp->exp_obd->obd_name, exp->exp_client_uuid.uuid, exp,
769 exp->exp_filter_data.fed_pending, pending);
770 exp->exp_filter_data.fed_pending -= pending;
771 LASSERTF(filter->fo_tot_granted >= pending,
772 "%s: cli %s/%p tot_granted: "LPU64" grant_used: %lu\n",
773 exp->exp_obd->obd_name, exp->exp_client_uuid.uuid, exp,
774 exp->exp_obd->u.filter.fo_tot_granted, pending);
775 filter->fo_tot_granted -= pending;
776 LASSERTF(filter->fo_tot_pending >= pending,
777 "%s: cli %s/%p tot_pending: "LPU64" grant_used: %lu\n",
778 exp->exp_obd->obd_name, exp->exp_client_uuid.uuid, exp,
779 filter->fo_tot_pending, pending);
780 filter->fo_tot_pending -= pending;
782 spin_unlock(&exp->exp_obd->obd_osfs_lock);
784 int filter_do_cow(struct obd_export *exp, struct obd_ioobj *obj,
785 int nioo, struct niobuf_remote *rnb)
787 struct dentry *dentry;
788 struct lvfs_run_ctxt saved;
789 struct write_extents *extents = NULL;
790 int j, rc = 0, numexts = 0, flags = 0;
796 push_ctxt(&saved, &exp->exp_obd->obd_lvfs_ctxt, NULL);
798 dentry = filter_id2dentry(exp->exp_obd, NULL, obj->ioo_gr,
800 if (IS_ERR(dentry)) {
801 pop_ctxt(&saved, &exp->exp_obd->obd_lvfs_ctxt, NULL);
802 RETURN (PTR_ERR(dentry));
805 if (dentry->d_inode == NULL) {
806 CERROR("trying to write extents to non-existent file "LPU64"\n",
808 GOTO(cleanup, rc = -ENOENT);
811 flags = fsfilt_get_fs_flags(exp->exp_obd, dentry);
812 if (!(flags & SM_DO_COW))
815 OBD_ALLOC(extents, obj->ioo_bufcnt * sizeof(struct write_extents));
817 CERROR("No Memory\n");
818 GOTO(cleanup, rc = -ENOMEM);
820 for (j = 0; j < obj->ioo_bufcnt; j++) {
821 if (rnb[j].len != 0) {
822 extents[numexts].w_count = rnb[j].len;
823 extents[numexts].w_pos = rnb[j].offset;
827 rc = fsfilt_do_write_cow(exp->exp_obd, dentry, extents, numexts);
829 CERROR("Do cow error id "LPU64" rc:%d \n",
836 OBD_FREE(extents, obj->ioo_bufcnt * sizeof(struct write_extents));
839 pop_ctxt(&saved, &exp->exp_obd->obd_lvfs_ctxt, NULL);
844 int filter_write_extents(struct obd_export *exp, struct obd_ioobj *obj, int nobj,
845 int niocount, struct niobuf_local *local, int rc)
847 struct lvfs_run_ctxt saved;
848 struct dentry *dentry;
849 struct niobuf_local *lnb;
858 push_ctxt(&saved, &exp->exp_obd->obd_lvfs_ctxt, NULL);
859 dentry = filter_id2dentry(exp->exp_obd, NULL, obj->ioo_gr,
861 if (IS_ERR(dentry)) {
862 pop_ctxt(&saved, &exp->exp_obd->obd_lvfs_ctxt, NULL);
863 RETURN (PTR_ERR(dentry));
866 if (dentry->d_inode == NULL) {
867 CERROR("trying to write extents to non-existent file "LPU64"\n",
869 GOTO(cleanup, rc = -ENOENT);
872 flags = fsfilt_get_fs_flags(exp->exp_obd, dentry);
873 if (!(flags & SM_DO_REC))
876 for (i = 0, lnb = local; i < obj->ioo_bufcnt; i++, lnb++) {
878 offset = lnb->offset;
880 } else if (lnb->offset == (offset + len)) {
883 rc = fsfilt_write_extents(exp->exp_obd, dentry,
886 CERROR("write exts off "LPU64" num %u rc:%d\n",
890 offset = lnb->offset;
895 rc = fsfilt_write_extents(exp->exp_obd, dentry,
898 CERROR("write exts off "LPU64" num %u rc:%d\n",
905 pop_ctxt(&saved, &exp->exp_obd->obd_lvfs_ctxt, NULL);
909 int filter_commitrw(int cmd, struct obd_export *exp, struct obdo *oa,
910 int objcount, struct obd_ioobj *obj, int niocount,
911 struct niobuf_local *res, struct obd_trans_info *oti,int ret)
914 /* remove that audit handlers due to fsfilt_inode_map_pages hooks
915 //struct lustre_id *id = obdo_id(oa);
916 //__u32 len = sizeof(*id);
917 //struct inode * inode = res->dentry->d_inode;
918 //struct super_block * sb = res->dentry->d_sb;
919 //struct obd_device *obd = class_exp2obd(exp);
921 current->user->nid = oti->oti_nid;
923 if (cmd == OBD_BRW_WRITE) {
924 rc = filter_commitrw_write(exp, oa, objcount, obj, niocount,
926 /* fsfilt_set_info(obd, sb, inode, 10, "file_write", len, (void*)id); */
928 else if (cmd == OBD_BRW_READ) {
929 rc = filter_commitrw_read(exp, oa, objcount, obj, niocount,
931 /* fsfilt_set_info(obd, sb, inode, 9, "file_read", len, (void*)id); */
939 int filter_brw(int cmd, struct obd_export *exp, struct obdo *oa,
940 struct lov_stripe_md *lsm, obd_count oa_bufs,
941 struct brw_page *pga, struct obd_trans_info *oti)
943 struct obd_ioobj ioo;
944 struct niobuf_local *lnb;
945 struct niobuf_remote *rnb;
950 OBD_ALLOC(lnb, oa_bufs * sizeof(struct niobuf_local));
951 OBD_ALLOC(rnb, oa_bufs * sizeof(struct niobuf_remote));
953 if (lnb == NULL || rnb == NULL)
954 GOTO(out, ret = -ENOMEM);
956 for (i = 0; i < oa_bufs; i++) {
957 rnb[i].offset = pga[i].disk_offset;
958 rnb[i].len = pga[i].count;
961 obdo_to_ioobj(oa, &ioo);
962 ioo.ioo_bufcnt = oa_bufs;
964 ret = filter_preprw(cmd, exp, oa, 1, &ioo, oa_bufs, rnb,
969 for (i = 0; i < oa_bufs; i++) {
974 if (lnb[i].page == NULL)
977 off = pga[i].disk_offset & ~PAGE_MASK;
978 virt = kmap(pga[i].pg);
979 addr = kmap(lnb[i].page);
981 /* 2 kmaps == vanishingly small deadlock opportunity */
983 if (cmd & OBD_BRW_WRITE)
984 memcpy(addr + off, virt + off, pga[i].count);
986 memcpy(virt + off, addr + off, pga[i].count);
992 ret = filter_commitrw(cmd, exp, oa, 1, &ioo, oa_bufs, lnb, oti, ret);
996 OBD_FREE(lnb, oa_bufs * sizeof(struct niobuf_local));
998 OBD_FREE(rnb, oa_bufs * sizeof(struct niobuf_remote));