4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see
18 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
20 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
21 * CA 95054 USA or visit www.sun.com if you need additional information or
27 * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
28 * Use is subject to license terms.
30 * Copyright (c) 2011, 2012, Intel Corporation.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
36 * cl code shared between vvp and liblustre (and other Lustre clients in the
39 * Author: Nikita Danilov <nikita.danilov@sun.com>
42 #define DEBUG_SUBSYSTEM S_LLITE
44 # include <linux/libcfs/libcfs.h>
45 # include <linux/fs.h>
46 # include <linux/sched.h>
47 # include <linux/mm.h>
48 # include <linux/quotaops.h>
49 # include <linux/highmem.h>
50 # include <linux/pagemap.h>
51 # include <linux/rbtree.h>
54 #include <obd_support.h>
55 #include <lustre_fid.h>
56 #include <lustre_lite.h>
57 #include <lustre_dlm.h>
58 #include <lustre_ver.h>
59 #include <lustre_mdc.h>
60 #include <cl_object.h>
64 #include "../llite/llite_internal.h"
66 const struct cl_req_operations ccc_req_ops;
69 * ccc_ prefix stands for "Common Client Code".
72 static struct kmem_cache *ccc_lock_kmem;
73 static struct kmem_cache *ccc_object_kmem;
74 static struct kmem_cache *ccc_thread_kmem;
75 static struct kmem_cache *ccc_session_kmem;
76 static struct kmem_cache *ccc_req_kmem;
78 static struct lu_kmem_descr ccc_caches[] = {
80 .ckd_cache = &ccc_lock_kmem,
81 .ckd_name = "ccc_lock_kmem",
82 .ckd_size = sizeof (struct ccc_lock)
85 .ckd_cache = &ccc_object_kmem,
86 .ckd_name = "ccc_object_kmem",
87 .ckd_size = sizeof (struct ccc_object)
90 .ckd_cache = &ccc_thread_kmem,
91 .ckd_name = "ccc_thread_kmem",
92 .ckd_size = sizeof (struct ccc_thread_info),
95 .ckd_cache = &ccc_session_kmem,
96 .ckd_name = "ccc_session_kmem",
97 .ckd_size = sizeof (struct ccc_session)
100 .ckd_cache = &ccc_req_kmem,
101 .ckd_name = "ccc_req_kmem",
102 .ckd_size = sizeof (struct ccc_req)
109 /*****************************************************************************
111 * Vvp device and device type functions.
115 void *ccc_key_init(const struct lu_context *ctx,
116 struct lu_context_key *key)
118 struct ccc_thread_info *info;
120 OBD_SLAB_ALLOC_PTR_GFP(info, ccc_thread_kmem, __GFP_IO);
122 info = ERR_PTR(-ENOMEM);
126 void ccc_key_fini(const struct lu_context *ctx,
127 struct lu_context_key *key, void *data)
129 struct ccc_thread_info *info = data;
130 OBD_SLAB_FREE_PTR(info, ccc_thread_kmem);
133 void *ccc_session_key_init(const struct lu_context *ctx,
134 struct lu_context_key *key)
136 struct ccc_session *session;
138 OBD_SLAB_ALLOC_PTR_GFP(session, ccc_session_kmem, __GFP_IO);
140 session = ERR_PTR(-ENOMEM);
144 void ccc_session_key_fini(const struct lu_context *ctx,
145 struct lu_context_key *key, void *data)
147 struct ccc_session *session = data;
148 OBD_SLAB_FREE_PTR(session, ccc_session_kmem);
151 struct lu_context_key ccc_key = {
152 .lct_tags = LCT_CL_THREAD,
153 .lct_init = ccc_key_init,
154 .lct_fini = ccc_key_fini
157 struct lu_context_key ccc_session_key = {
158 .lct_tags = LCT_SESSION,
159 .lct_init = ccc_session_key_init,
160 .lct_fini = ccc_session_key_fini
164 /* type constructor/destructor: ccc_type_{init,fini,start,stop}(). */
165 // LU_TYPE_INIT_FINI(ccc, &ccc_key, &ccc_session_key);
167 int ccc_device_init(const struct lu_env *env, struct lu_device *d,
168 const char *name, struct lu_device *next)
170 struct ccc_device *vdv;
174 vdv->cdv_next = lu2cl_dev(next);
176 LASSERT(d->ld_site != NULL && next->ld_type != NULL);
177 next->ld_site = d->ld_site;
178 rc = next->ld_type->ldt_ops->ldto_device_init(
179 env, next, next->ld_type->ldt_name, NULL);
182 lu_ref_add(&next->ld_reference, "lu-stack", &lu_site_init);
187 struct lu_device *ccc_device_fini(const struct lu_env *env,
190 return cl2lu_dev(lu2ccc_dev(d)->cdv_next);
193 struct lu_device *ccc_device_alloc(const struct lu_env *env,
194 struct lu_device_type *t,
195 struct lustre_cfg *cfg,
196 const struct lu_device_operations *luops,
197 const struct cl_device_operations *clops)
199 struct ccc_device *vdv;
200 struct lu_device *lud;
201 struct cl_site *site;
206 return ERR_PTR(-ENOMEM);
208 lud = &vdv->cdv_cl.cd_lu_dev;
209 cl_device_init(&vdv->cdv_cl, t);
210 ccc2lu_dev(vdv)->ld_ops = luops;
211 vdv->cdv_cl.cd_ops = clops;
215 rc = cl_site_init(site, &vdv->cdv_cl);
217 rc = lu_site_init_finish(&site->cs_lu);
219 LASSERT(lud->ld_site == NULL);
220 CERROR("Cannot init lu_site, rc %d.\n", rc);
226 ccc_device_free(env, lud);
232 struct lu_device *ccc_device_free(const struct lu_env *env,
235 struct ccc_device *vdv = lu2ccc_dev(d);
236 struct cl_site *site = lu2cl_site(d->ld_site);
237 struct lu_device *next = cl2lu_dev(vdv->cdv_next);
239 if (d->ld_site != NULL) {
243 cl_device_fini(lu2cl_dev(d));
248 int ccc_req_init(const struct lu_env *env, struct cl_device *dev,
254 OBD_SLAB_ALLOC_PTR_GFP(vrq, ccc_req_kmem, __GFP_IO);
256 cl_req_slice_add(req, &vrq->crq_cl, dev, &ccc_req_ops);
264 * An `emergency' environment used by ccc_inode_fini() when cl_env_get()
265 * fails. Access to this environment is serialized by ccc_inode_fini_guard
268 static struct lu_env *ccc_inode_fini_env = NULL;
271 * A mutex serializing calls to slp_inode_fini() under extreme memory
272 * pressure, when environments cannot be allocated.
274 static DEFINE_MUTEX(ccc_inode_fini_guard);
275 static int dummy_refcheck;
277 int ccc_global_init(struct lu_device_type *device_type)
281 result = lu_kmem_init(ccc_caches);
285 result = lu_device_type_init(device_type);
289 ccc_inode_fini_env = cl_env_alloc(&dummy_refcheck,
290 LCT_REMEMBER|LCT_NOREF);
291 if (IS_ERR(ccc_inode_fini_env)) {
292 result = PTR_ERR(ccc_inode_fini_env);
296 ccc_inode_fini_env->le_ctx.lc_cookie = 0x4;
299 lu_device_type_fini(device_type);
301 lu_kmem_fini(ccc_caches);
305 void ccc_global_fini(struct lu_device_type *device_type)
307 if (ccc_inode_fini_env != NULL) {
308 cl_env_put(ccc_inode_fini_env, &dummy_refcheck);
309 ccc_inode_fini_env = NULL;
311 lu_device_type_fini(device_type);
312 lu_kmem_fini(ccc_caches);
315 /*****************************************************************************
321 struct lu_object *ccc_object_alloc(const struct lu_env *env,
322 const struct lu_object_header *unused,
323 struct lu_device *dev,
324 const struct cl_object_operations *clops,
325 const struct lu_object_operations *luops)
327 struct ccc_object *vob;
328 struct lu_object *obj;
330 OBD_SLAB_ALLOC_PTR_GFP(vob, ccc_object_kmem, __GFP_IO);
332 struct cl_object_header *hdr;
335 hdr = &vob->cob_header;
336 cl_object_header_init(hdr);
337 lu_object_init(obj, &hdr->coh_lu, dev);
338 lu_object_add_top(&hdr->coh_lu, obj);
340 vob->cob_cl.co_ops = clops;
347 int ccc_object_init0(const struct lu_env *env,
348 struct ccc_object *vob,
349 const struct cl_object_conf *conf)
351 vob->cob_inode = conf->coc_inode;
352 vob->cob_transient_pages = 0;
353 cl_object_page_init(&vob->cob_cl, sizeof(struct ccc_page));
357 int ccc_object_init(const struct lu_env *env, struct lu_object *obj,
358 const struct lu_object_conf *conf)
360 struct ccc_device *dev = lu2ccc_dev(obj->lo_dev);
361 struct ccc_object *vob = lu2ccc(obj);
362 struct lu_object *below;
363 struct lu_device *under;
366 under = &dev->cdv_next->cd_lu_dev;
367 below = under->ld_ops->ldo_object_alloc(env, obj->lo_header, under);
369 const struct cl_object_conf *cconf;
371 cconf = lu2cl_conf(conf);
372 INIT_LIST_HEAD(&vob->cob_pending_list);
373 lu_object_add(obj, below);
374 result = ccc_object_init0(env, vob, cconf);
380 void ccc_object_free(const struct lu_env *env, struct lu_object *obj)
382 struct ccc_object *vob = lu2ccc(obj);
385 lu_object_header_fini(obj->lo_header);
386 OBD_SLAB_FREE_PTR(vob, ccc_object_kmem);
389 int ccc_lock_init(const struct lu_env *env,
390 struct cl_object *obj, struct cl_lock *lock,
391 const struct cl_io *unused,
392 const struct cl_lock_operations *lkops)
394 struct ccc_lock *clk;
397 CLOBINVRNT(env, obj, ccc_object_invariant(obj));
399 OBD_SLAB_ALLOC_PTR_GFP(clk, ccc_lock_kmem, __GFP_IO);
401 cl_lock_slice_add(lock, &clk->clk_cl, obj, lkops);
408 int ccc_attr_set(const struct lu_env *env, struct cl_object *obj,
409 const struct cl_attr *attr, unsigned valid)
414 int ccc_object_glimpse(const struct lu_env *env,
415 const struct cl_object *obj, struct ost_lvb *lvb)
417 struct inode *inode = ccc_object_inode(obj);
419 lvb->lvb_mtime = cl_inode_mtime(inode);
420 lvb->lvb_atime = cl_inode_atime(inode);
421 lvb->lvb_ctime = cl_inode_ctime(inode);
423 * LU-417: Add dirty pages block count lest i_blocks reports 0, some
424 * "cp" or "tar" on remote node may think it's a completely sparse file
427 if (lvb->lvb_size > 0 && lvb->lvb_blocks == 0)
428 lvb->lvb_blocks = dirty_cnt(inode);
434 int ccc_conf_set(const struct lu_env *env, struct cl_object *obj,
435 const struct cl_object_conf *conf)
437 /* TODO: destroy all pages attached to this object. */
441 static void ccc_object_size_lock(struct cl_object *obj)
443 struct inode *inode = ccc_object_inode(obj);
445 cl_isize_lock(inode);
446 cl_object_attr_lock(obj);
449 static void ccc_object_size_unlock(struct cl_object *obj)
451 struct inode *inode = ccc_object_inode(obj);
453 cl_object_attr_unlock(obj);
454 cl_isize_unlock(inode);
457 /*****************************************************************************
463 struct page *ccc_page_vmpage(const struct lu_env *env,
464 const struct cl_page_slice *slice)
466 return cl2vm_page(slice);
469 int ccc_page_is_under_lock(const struct lu_env *env,
470 const struct cl_page_slice *slice,
473 struct ccc_io *cio = ccc_env_io(env);
474 struct cl_lock_descr *desc = &ccc_env_info(env)->cti_descr;
475 struct cl_page *page = slice->cpl_page;
479 if (io->ci_type == CIT_READ || io->ci_type == CIT_WRITE ||
480 io->ci_type == CIT_FAULT) {
481 if (cio->cui_fd->fd_flags & LL_FILE_GROUP_LOCKED)
484 desc->cld_start = page->cp_index;
485 desc->cld_end = page->cp_index;
486 desc->cld_obj = page->cp_obj;
487 desc->cld_mode = CLM_READ;
488 result = cl_queue_match(&io->ci_lockset.cls_done,
496 int ccc_fail(const struct lu_env *env, const struct cl_page_slice *slice)
505 void ccc_transient_page_verify(const struct cl_page *page)
509 int ccc_transient_page_own(const struct lu_env *env,
510 const struct cl_page_slice *slice,
511 struct cl_io *unused,
514 ccc_transient_page_verify(slice->cpl_page);
518 void ccc_transient_page_assume(const struct lu_env *env,
519 const struct cl_page_slice *slice,
520 struct cl_io *unused)
522 ccc_transient_page_verify(slice->cpl_page);
525 void ccc_transient_page_unassume(const struct lu_env *env,
526 const struct cl_page_slice *slice,
527 struct cl_io *unused)
529 ccc_transient_page_verify(slice->cpl_page);
532 void ccc_transient_page_disown(const struct lu_env *env,
533 const struct cl_page_slice *slice,
534 struct cl_io *unused)
536 ccc_transient_page_verify(slice->cpl_page);
539 void ccc_transient_page_discard(const struct lu_env *env,
540 const struct cl_page_slice *slice,
541 struct cl_io *unused)
543 struct cl_page *page = slice->cpl_page;
545 ccc_transient_page_verify(slice->cpl_page);
548 * For transient pages, remove it from the radix tree.
550 cl_page_delete(env, page);
553 int ccc_transient_page_prep(const struct lu_env *env,
554 const struct cl_page_slice *slice,
555 struct cl_io *unused)
557 /* transient page should always be sent. */
561 /*****************************************************************************
567 void ccc_lock_delete(const struct lu_env *env,
568 const struct cl_lock_slice *slice)
570 CLOBINVRNT(env, slice->cls_obj, ccc_object_invariant(slice->cls_obj));
573 void ccc_lock_fini(const struct lu_env *env, struct cl_lock_slice *slice)
575 struct ccc_lock *clk = cl2ccc_lock(slice);
576 OBD_SLAB_FREE_PTR(clk, ccc_lock_kmem);
579 int ccc_lock_enqueue(const struct lu_env *env,
580 const struct cl_lock_slice *slice,
581 struct cl_io *unused, __u32 enqflags)
583 CLOBINVRNT(env, slice->cls_obj, ccc_object_invariant(slice->cls_obj));
587 int ccc_lock_unuse(const struct lu_env *env, const struct cl_lock_slice *slice)
589 CLOBINVRNT(env, slice->cls_obj, ccc_object_invariant(slice->cls_obj));
593 int ccc_lock_wait(const struct lu_env *env, const struct cl_lock_slice *slice)
595 CLOBINVRNT(env, slice->cls_obj, ccc_object_invariant(slice->cls_obj));
600 * Implementation of cl_lock_operations::clo_fits_into() methods for ccc
601 * layer. This function is executed every time io finds an existing lock in
602 * the lock cache while creating new lock. This function has to decide whether
603 * cached lock "fits" into io.
605 * \param slice lock to be checked
606 * \param io IO that wants a lock.
608 * \see lov_lock_fits_into().
610 int ccc_lock_fits_into(const struct lu_env *env,
611 const struct cl_lock_slice *slice,
612 const struct cl_lock_descr *need,
613 const struct cl_io *io)
615 const struct cl_lock *lock = slice->cls_lock;
616 const struct cl_lock_descr *descr = &lock->cll_descr;
617 const struct ccc_io *cio = ccc_env_io(env);
621 * Work around DLM peculiarity: it assumes that glimpse
622 * (LDLM_FL_HAS_INTENT) lock is always LCK_PR, and returns reads lock
623 * when asked for LCK_PW lock with LDLM_FL_HAS_INTENT flag set. Make
624 * sure that glimpse doesn't get CLM_WRITE top-lock, so that it
625 * doesn't enqueue CLM_WRITE sub-locks.
627 if (cio->cui_glimpse)
628 result = descr->cld_mode != CLM_WRITE;
631 * Also, don't match incomplete write locks for read, otherwise read
632 * would enqueue missing sub-locks in the write mode.
634 else if (need->cld_mode != descr->cld_mode)
635 result = lock->cll_state >= CLS_ENQUEUED;
642 * Implements cl_lock_operations::clo_state() method for ccc layer, invoked
643 * whenever lock state changes. Transfers object attributes, that might be
644 * updated as a result of lock acquiring into inode.
646 void ccc_lock_state(const struct lu_env *env,
647 const struct cl_lock_slice *slice,
648 enum cl_lock_state state)
650 struct cl_lock *lock = slice->cls_lock;
653 * Refresh inode attributes when the lock is moving into CLS_HELD
654 * state, and only when this is a result of real enqueue, rather than
655 * of finding lock in the cache.
657 if (state == CLS_HELD && lock->cll_state < CLS_HELD) {
658 struct cl_object *obj;
661 obj = slice->cls_obj;
662 inode = ccc_object_inode(obj);
664 /* vmtruncate() sets the i_size
665 * under both a DLM lock and the
666 * ll_inode_size_lock(). If we don't get the
667 * ll_inode_size_lock() here we can match the DLM lock and
668 * reset i_size. generic_file_write can then trust the
669 * stale i_size when doing appending writes and effectively
670 * cancel the result of the truncate. Getting the
671 * ll_inode_size_lock() after the enqueue maintains the DLM
672 * -> ll_inode_size_lock() acquiring order. */
673 if (lock->cll_descr.cld_start == 0 &&
674 lock->cll_descr.cld_end == CL_PAGE_EOF)
675 cl_merge_lvb(env, inode);
679 /*****************************************************************************
685 void ccc_io_fini(const struct lu_env *env, const struct cl_io_slice *ios)
687 struct cl_io *io = ios->cis_io;
689 CLOBINVRNT(env, io->ci_obj, ccc_object_invariant(io->ci_obj));
692 int ccc_io_one_lock_index(const struct lu_env *env, struct cl_io *io,
693 __u32 enqflags, enum cl_lock_mode mode,
694 pgoff_t start, pgoff_t end)
696 struct ccc_io *cio = ccc_env_io(env);
697 struct cl_lock_descr *descr = &cio->cui_link.cill_descr;
698 struct cl_object *obj = io->ci_obj;
700 CLOBINVRNT(env, obj, ccc_object_invariant(obj));
702 CDEBUG(D_VFSTRACE, "lock: %d [%lu, %lu]\n", mode, start, end);
704 memset(&cio->cui_link, 0, sizeof cio->cui_link);
706 if (cio->cui_fd && (cio->cui_fd->fd_flags & LL_FILE_GROUP_LOCKED)) {
707 descr->cld_mode = CLM_GROUP;
708 descr->cld_gid = cio->cui_fd->fd_grouplock.cg_gid;
710 descr->cld_mode = mode;
712 descr->cld_obj = obj;
713 descr->cld_start = start;
714 descr->cld_end = end;
715 descr->cld_enq_flags = enqflags;
717 cl_io_lock_add(env, io, &cio->cui_link);
721 void ccc_io_update_iov(const struct lu_env *env,
722 struct ccc_io *cio, struct cl_io *io)
725 size_t size = io->u.ci_rw.crw_count;
727 cio->cui_iov_olen = 0;
728 if (!cl_is_normalio(env, io) || cio->cui_tot_nrsegs == 0)
731 for (i = 0; i < cio->cui_tot_nrsegs; i++) {
732 struct iovec *iv = &cio->cui_iov[i];
734 if (iv->iov_len < size)
737 if (iv->iov_len > size) {
738 cio->cui_iov_olen = iv->iov_len;
745 cio->cui_nrsegs = i + 1;
746 LASSERTF(cio->cui_tot_nrsegs >= cio->cui_nrsegs,
747 "tot_nrsegs: %lu, nrsegs: %lu\n",
748 cio->cui_tot_nrsegs, cio->cui_nrsegs);
751 int ccc_io_one_lock(const struct lu_env *env, struct cl_io *io,
752 __u32 enqflags, enum cl_lock_mode mode,
753 loff_t start, loff_t end)
755 struct cl_object *obj = io->ci_obj;
756 return ccc_io_one_lock_index(env, io, enqflags, mode,
757 cl_index(obj, start), cl_index(obj, end));
760 void ccc_io_end(const struct lu_env *env, const struct cl_io_slice *ios)
762 CLOBINVRNT(env, ios->cis_io->ci_obj,
763 ccc_object_invariant(ios->cis_io->ci_obj));
766 void ccc_io_advance(const struct lu_env *env,
767 const struct cl_io_slice *ios,
770 struct ccc_io *cio = cl2ccc_io(env, ios);
771 struct cl_io *io = ios->cis_io;
772 struct cl_object *obj = ios->cis_io->ci_obj;
774 CLOBINVRNT(env, obj, ccc_object_invariant(obj));
776 if (!cl_is_normalio(env, io))
779 LASSERT(cio->cui_tot_nrsegs >= cio->cui_nrsegs);
780 LASSERT(cio->cui_tot_count >= nob);
782 cio->cui_iov += cio->cui_nrsegs;
783 cio->cui_tot_nrsegs -= cio->cui_nrsegs;
784 cio->cui_tot_count -= nob;
787 if (cio->cui_iov_olen > 0) {
791 cio->cui_tot_nrsegs++;
792 iv = &cio->cui_iov[0];
793 if (io->ci_continue) {
794 iv->iov_base += iv->iov_len;
795 LASSERT(cio->cui_iov_olen > iv->iov_len);
796 iv->iov_len = cio->cui_iov_olen - iv->iov_len;
798 /* restore the iov_len, in case of restart io. */
799 iv->iov_len = cio->cui_iov_olen;
801 cio->cui_iov_olen = 0;
806 * Helper function that if necessary adjusts file size (inode->i_size), when
807 * position at the offset \a pos is accessed. File size can be arbitrary stale
808 * on a Lustre client, but client at least knows KMS. If accessed area is
809 * inside [0, KMS], set file size to KMS, otherwise glimpse file size.
811 * Locking: cl_isize_lock is used to serialize changes to inode size and to
812 * protect consistency between inode size and cl_object
813 * attributes. cl_object_size_lock() protects consistency between cl_attr's of
814 * top-object and sub-objects.
816 int ccc_prep_size(const struct lu_env *env, struct cl_object *obj,
817 struct cl_io *io, loff_t start, size_t count, int *exceed)
819 struct cl_attr *attr = ccc_env_thread_attr(env);
820 struct inode *inode = ccc_object_inode(obj);
821 loff_t pos = start + count - 1;
826 * Consistency guarantees: following possibilities exist for the
827 * relation between region being accessed and real file size at this
830 * (A): the region is completely inside of the file;
832 * (B-x): x bytes of region are inside of the file, the rest is
835 * (C): the region is completely outside of the file.
837 * This classification is stable under DLM lock already acquired by
838 * the caller, because to change the class, other client has to take
839 * DLM lock conflicting with our lock. Also, any updates to ->i_size
840 * by other threads on this client are serialized by
841 * ll_inode_size_lock(). This guarantees that short reads are handled
842 * correctly in the face of concurrent writes and truncates.
844 ccc_object_size_lock(obj);
845 result = cl_object_attr_get(env, obj, attr);
850 * A glimpse is necessary to determine whether we
851 * return a short read (B) or some zeroes at the end
854 ccc_object_size_unlock(obj);
855 result = cl_glimpse_lock(env, io, inode, obj, 0);
856 if (result == 0 && exceed != NULL) {
857 /* If objective page index exceed end-of-file
858 * page index, return directly. Do not expect
859 * kernel will check such case correctly.
860 * linux-2.6.18-128.1.1 miss to do that.
862 loff_t size = cl_isize_read(inode);
863 unsigned long cur_index = start >> PAGE_CACHE_SHIFT;
865 if ((size == 0 && cur_index != 0) ||
866 (((size - 1) >> PAGE_CACHE_SHIFT) < cur_index))
872 * region is within kms and, hence, within real file
873 * size (A). We need to increase i_size to cover the
874 * read region so that generic_file_read() will do its
875 * job, but that doesn't mean the kms size is
876 * _correct_, it is only the _minimum_ size. If
877 * someone does a stat they will get the correct size
878 * which will always be >= the kms value here.
881 if (cl_isize_read(inode) < kms) {
882 cl_isize_write_nolock(inode, kms);
884 DFID" updating i_size "LPU64"\n",
885 PFID(lu_object_fid(&obj->co_lu)),
886 (__u64)cl_isize_read(inode));
891 ccc_object_size_unlock(obj);
895 /*****************************************************************************
897 * Transfer operations.
901 void ccc_req_completion(const struct lu_env *env,
902 const struct cl_req_slice *slice, int ioret)
907 cl_stats_tally(slice->crs_dev, slice->crs_req->crq_type, ioret);
909 vrq = cl2ccc_req(slice);
910 OBD_SLAB_FREE_PTR(vrq, ccc_req_kmem);
914 * Implementation of struct cl_req_operations::cro_attr_set() for ccc
915 * layer. ccc is responsible for
933 void ccc_req_attr_set(const struct lu_env *env,
934 const struct cl_req_slice *slice,
935 const struct cl_object *obj,
936 struct cl_req_attr *attr, obd_valid flags)
940 obd_flag valid_flags;
943 inode = ccc_object_inode(obj);
944 valid_flags = OBD_MD_FLTYPE;
946 if ((flags & OBD_MD_FLOSSCAPA) != 0) {
947 LASSERT(attr->cra_capa == NULL);
948 attr->cra_capa = cl_capa_lookup(inode,
949 slice->crs_req->crq_type);
952 if (slice->crs_req->crq_type == CRT_WRITE) {
953 if (flags & OBD_MD_FLEPOCH) {
954 oa->o_valid |= OBD_MD_FLEPOCH;
955 oa->o_ioepoch = cl_i2info(inode)->lli_ioepoch;
956 valid_flags |= OBD_MD_FLMTIME | OBD_MD_FLCTIME |
957 OBD_MD_FLUID | OBD_MD_FLGID;
960 obdo_from_inode(oa, inode, valid_flags & flags);
961 obdo_set_parent_fid(oa, &cl_i2info(inode)->lli_fid);
962 memcpy(attr->cra_jobid, cl_i2info(inode)->lli_jobid,
963 JOBSTATS_JOBID_SIZE);
966 const struct cl_req_operations ccc_req_ops = {
967 .cro_attr_set = ccc_req_attr_set,
968 .cro_completion = ccc_req_completion
971 int cl_setattr_ost(struct inode *inode, const struct iattr *attr,
972 struct obd_capa *capa)
979 env = cl_env_get(&refcheck);
983 io = ccc_env_thread_io(env);
984 io->ci_obj = cl_i2info(inode)->lli_clob;
986 io->u.ci_setattr.sa_attr.lvb_atime = LTIME_S(attr->ia_atime);
987 io->u.ci_setattr.sa_attr.lvb_mtime = LTIME_S(attr->ia_mtime);
988 io->u.ci_setattr.sa_attr.lvb_ctime = LTIME_S(attr->ia_ctime);
989 io->u.ci_setattr.sa_attr.lvb_size = attr->ia_size;
990 io->u.ci_setattr.sa_valid = attr->ia_valid;
991 io->u.ci_setattr.sa_capa = capa;
994 if (cl_io_init(env, io, CIT_SETATTR, io->ci_obj) == 0) {
995 struct ccc_io *cio = ccc_env_io(env);
997 if (attr->ia_valid & ATTR_FILE)
998 /* populate the file descriptor for ftruncate to honor
999 * group lock - see LU-787 */
1000 cio->cui_fd = cl_iattr2fd(inode, attr);
1002 result = cl_io_loop(env, io);
1004 result = io->ci_result;
1006 cl_io_fini(env, io);
1007 if (unlikely(io->ci_need_restart))
1009 cl_env_put(env, &refcheck);
1013 /*****************************************************************************
1019 struct lu_device *ccc2lu_dev(struct ccc_device *vdv)
1021 return &vdv->cdv_cl.cd_lu_dev;
1024 struct ccc_device *lu2ccc_dev(const struct lu_device *d)
1026 return container_of0(d, struct ccc_device, cdv_cl.cd_lu_dev);
1029 struct ccc_device *cl2ccc_dev(const struct cl_device *d)
1031 return container_of0(d, struct ccc_device, cdv_cl);
1034 struct lu_object *ccc2lu(struct ccc_object *vob)
1036 return &vob->cob_cl.co_lu;
1039 struct ccc_object *lu2ccc(const struct lu_object *obj)
1041 return container_of0(obj, struct ccc_object, cob_cl.co_lu);
1044 struct ccc_object *cl2ccc(const struct cl_object *obj)
1046 return container_of0(obj, struct ccc_object, cob_cl);
1049 struct ccc_lock *cl2ccc_lock(const struct cl_lock_slice *slice)
1051 return container_of(slice, struct ccc_lock, clk_cl);
1054 struct ccc_io *cl2ccc_io(const struct lu_env *env,
1055 const struct cl_io_slice *slice)
1059 cio = container_of(slice, struct ccc_io, cui_cl);
1060 LASSERT(cio == ccc_env_io(env));
1064 struct ccc_req *cl2ccc_req(const struct cl_req_slice *slice)
1066 return container_of0(slice, struct ccc_req, crq_cl);
1069 struct page *cl2vm_page(const struct cl_page_slice *slice)
1071 return cl2ccc_page(slice)->cpg_page;
1074 /*****************************************************************************
1079 int ccc_object_invariant(const struct cl_object *obj)
1081 struct inode *inode = ccc_object_inode(obj);
1082 struct cl_inode_info *lli = cl_i2info(inode);
1084 return (S_ISREG(cl_inode_mode(inode)) ||
1085 /* i_mode of unlinked inode is zeroed. */
1086 cl_inode_mode(inode) == 0) && lli->lli_clob == obj;
1089 struct inode *ccc_object_inode(const struct cl_object *obj)
1091 return cl2ccc(obj)->cob_inode;
1095 * Returns a pointer to cl_page associated with \a vmpage, without acquiring
1096 * additional reference to the resulting page. This is an unsafe version of
1097 * cl_vmpage_page() that can only be used under vmpage lock.
1099 struct cl_page *ccc_vmpage_page_transient(struct page *vmpage)
1101 KLASSERT(PageLocked(vmpage));
1102 return (struct cl_page *)vmpage->private;
1106 * Initialize or update CLIO structures for regular files when new
1107 * meta-data arrives from the server.
1109 * \param inode regular file inode
1110 * \param md new file metadata from MDS
1111 * - allocates cl_object if necessary,
1112 * - updated layout, if object was already here.
1114 int cl_file_inode_init(struct inode *inode, struct lustre_md *md)
1117 struct cl_inode_info *lli;
1118 struct cl_object *clob;
1119 struct lu_site *site;
1121 struct cl_object_conf conf = {
1130 LASSERT(md->body->valid & OBD_MD_FLID);
1131 LASSERT(S_ISREG(cl_inode_mode(inode)));
1133 env = cl_env_get(&refcheck);
1135 return PTR_ERR(env);
1137 site = cl_i2sbi(inode)->ll_site;
1138 lli = cl_i2info(inode);
1139 fid = &lli->lli_fid;
1140 LASSERT(fid_is_sane(fid));
1142 if (lli->lli_clob == NULL) {
1143 /* clob is slave of inode, empty lli_clob means for new inode,
1144 * there is no clob in cache with the given fid, so it is
1145 * unnecessary to perform lookup-alloc-lookup-insert, just
1146 * alloc and insert directly. */
1147 LASSERT(inode->i_state & I_NEW);
1148 conf.coc_lu.loc_flags = LOC_F_NEW;
1149 clob = cl_object_find(env, lu2cl_dev(site->ls_top_dev),
1151 if (!IS_ERR(clob)) {
1153 * No locking is necessary, as new inode is
1154 * locked by I_NEW bit.
1156 lli->lli_clob = clob;
1157 lli->lli_has_smd = lsm_has_objects(md->lsm);
1158 lu_object_ref_add(&clob->co_lu, "inode", inode);
1160 result = PTR_ERR(clob);
1162 result = cl_conf_set(env, lli->lli_clob, &conf);
1165 cl_env_put(env, &refcheck);
1168 CERROR("Failure to initialize cl object "DFID": %d\n",
1174 * Wait for others drop their references of the object at first, then we drop
1175 * the last one, which will lead to the object be destroyed immediately.
1176 * Must be called after cl_object_kill() against this object.
1178 * The reason we want to do this is: destroying top object will wait for sub
1179 * objects being destroyed first, so we can't let bottom layer (e.g. from ASTs)
1180 * to initiate top object destroying which may deadlock. See bz22520.
1182 static void cl_object_put_last(struct lu_env *env, struct cl_object *obj)
1184 struct lu_object_header *header = obj->co_lu.lo_header;
1185 wait_queue_t waiter;
1187 if (unlikely(atomic_read(&header->loh_ref) != 1)) {
1188 struct lu_site *site = obj->co_lu.lo_dev->ld_site;
1189 struct lu_site_bkt_data *bkt;
1191 bkt = lu_site_bkt_from_fid(site, &header->loh_fid);
1193 init_waitqueue_entry_current(&waiter);
1194 add_wait_queue(&bkt->lsb_marche_funebre, &waiter);
1197 set_current_state(TASK_UNINTERRUPTIBLE);
1198 if (atomic_read(&header->loh_ref) == 1)
1200 waitq_wait(&waiter, TASK_UNINTERRUPTIBLE);
1203 set_current_state(TASK_RUNNING);
1204 remove_wait_queue(&bkt->lsb_marche_funebre, &waiter);
1207 cl_object_put(env, obj);
1210 void cl_inode_fini(struct inode *inode)
1213 struct cl_inode_info *lli = cl_i2info(inode);
1214 struct cl_object *clob = lli->lli_clob;
1221 cookie = cl_env_reenter();
1222 env = cl_env_get(&refcheck);
1223 emergency = IS_ERR(env);
1225 mutex_lock(&ccc_inode_fini_guard);
1226 LASSERT(ccc_inode_fini_env != NULL);
1227 cl_env_implant(ccc_inode_fini_env, &refcheck);
1228 env = ccc_inode_fini_env;
1231 * cl_object cache is a slave to inode cache (which, in turn
1232 * is a slave to dentry cache), don't keep cl_object in memory
1233 * when its master is evicted.
1235 cl_object_kill(env, clob);
1236 lu_object_ref_del(&clob->co_lu, "inode", inode);
1237 cl_object_put_last(env, clob);
1238 lli->lli_clob = NULL;
1240 cl_env_unplant(ccc_inode_fini_env, &refcheck);
1241 mutex_unlock(&ccc_inode_fini_guard);
1243 cl_env_put(env, &refcheck);
1244 cl_env_reexit(cookie);
1249 * return IF_* type for given lu_dirent entry.
1250 * IF_* flag shld be converted to particular OS file type in
1251 * platform llite module.
1253 __u16 ll_dirent_type_get(struct lu_dirent *ent)
1256 struct luda_type *lt;
1259 if (le32_to_cpu(ent->lde_attrs) & LUDA_TYPE) {
1260 const unsigned align = sizeof(struct luda_type) - 1;
1262 len = le16_to_cpu(ent->lde_namelen);
1263 len = (len + align) & ~align;
1264 lt = (void *)ent->lde_name + len;
1265 type = IFTODT(le16_to_cpu(lt->lt_type));
1271 * build inode number from passed @fid */
1272 __u64 cl_fid_build_ino(const struct lu_fid *fid, int api32)
1274 if (BITS_PER_LONG == 32 || api32)
1275 return fid_flatten32(fid);
1277 return fid_flatten(fid);
1281 * build inode generation from passed @fid. If our FID overflows the 32-bit
1282 * inode number then return a non-zero generation to distinguish them. */
1283 __u32 cl_fid_build_gen(const struct lu_fid *fid)
1287 if (fid_is_igif(fid)) {
1288 gen = lu_igif_gen(fid);
1292 gen = (fid_flatten(fid) >> 32);
1296 /* lsm is unreliable after hsm implementation as layout can be changed at
1297 * any time. This is only to support old, non-clio-ized interfaces. It will
1298 * cause deadlock if clio operations are called with this extra layout refcount
1299 * because in case the layout changed during the IO, ll_layout_refresh() will
1300 * have to wait for the refcount to become zero to destroy the older layout.
1302 * Notice that the lsm returned by this function may not be valid unless called
1303 * inside layout lock - MDS_INODELOCK_LAYOUT. */
1304 struct lov_stripe_md *ccc_inode_lsm_get(struct inode *inode)
1306 return lov_lsm_get(cl_i2info(inode)->lli_clob);
1309 void inline ccc_inode_lsm_put(struct inode *inode, struct lov_stripe_md *lsm)
1311 lov_lsm_put(cl_i2info(inode)->lli_clob, lsm);