| /* |
| * GPL HEADER START |
| * |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 only, |
| * as published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, but |
| * WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * General Public License version 2 for more details (a copy is included |
| * in the LICENSE file that accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License |
| * version 2 along with this program; If not, see |
| * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf |
| * |
| * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| * CA 95054 USA or visit www.sun.com if you need additional information or |
| * have any questions. |
| * |
| * GPL HEADER END |
| */ |
| /* |
| * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved. |
| * Use is subject to license terms. |
| * |
| * Copyright (c) 2012, Intel Corporation. |
| * |
| */ |
| /* |
| * This file is part of Lustre, http://www.lustre.org/ |
| * Lustre is a trademark of Sun Microsystems, Inc. |
| * |
| * osc cache management. |
| * |
| * Author: Jinshan Xiong <jinshan.xiong@whamcloud.com> |
| */ |
| |
| #define DEBUG_SUBSYSTEM S_OSC |
| |
| #include "osc_cl_internal.h" |
| #include "osc_internal.h" |
| |
| static int extent_debug; /* set it to be true for more debug */ |
| |
| static void osc_update_pending(struct osc_object *obj, int cmd, int delta); |
| static int osc_extent_wait(const struct lu_env *env, struct osc_extent *ext, |
| int state); |
| static void osc_ap_completion(const struct lu_env *env, struct client_obd *cli, |
| struct osc_async_page *oap, int sent, int rc); |
| static int osc_make_ready(const struct lu_env *env, struct osc_async_page *oap, |
| int cmd); |
| static int osc_refresh_count(const struct lu_env *env, |
| struct osc_async_page *oap, int cmd); |
| static int osc_io_unplug_async(const struct lu_env *env, |
| struct client_obd *cli, struct osc_object *osc); |
| static void osc_free_grant(struct client_obd *cli, unsigned int nr_pages, |
| unsigned int lost_grant); |
| |
| static void osc_extent_tree_dump0(int level, struct osc_object *obj, |
| const char *func, int line); |
| #define osc_extent_tree_dump(lvl, obj) \ |
| osc_extent_tree_dump0(lvl, obj, __func__, __LINE__) |
| |
| /** \addtogroup osc |
| * @{ |
| */ |
| |
| /* ------------------ osc extent ------------------ */ |
| static inline char *ext_flags(struct osc_extent *ext, char *flags) |
| { |
| char *buf = flags; |
| *buf++ = ext->oe_rw ? 'r' : 'w'; |
| if (ext->oe_intree) |
| *buf++ = 'i'; |
| if (ext->oe_srvlock) |
| *buf++ = 's'; |
| if (ext->oe_hp) |
| *buf++ = 'h'; |
| if (ext->oe_urgent) |
| *buf++ = 'u'; |
| if (ext->oe_memalloc) |
| *buf++ = 'm'; |
| if (ext->oe_trunc_pending) |
| *buf++ = 't'; |
| if (ext->oe_fsync_wait) |
| *buf++ = 'Y'; |
| *buf = 0; |
| return flags; |
| } |
| |
| static inline char list_empty_marker(struct list_head *list) |
| { |
| return list_empty(list) ? '-' : '+'; |
| } |
| |
| #define EXTSTR "[%lu -> %lu/%lu]" |
| #define EXTPARA(ext) (ext)->oe_start, (ext)->oe_end, (ext)->oe_max_end |
| static const char *oes_strings[] = { |
| "inv", "active", "cache", "locking", "lockdone", "rpc", "trunc", NULL }; |
| |
| #define OSC_EXTENT_DUMP(lvl, extent, fmt, ...) do { \ |
| struct osc_extent *__ext = (extent); \ |
| char __buf[16]; \ |
| \ |
| CDEBUG(lvl, \ |
| "extent %p@{" EXTSTR ", " \ |
| "[%d|%d|%c|%s|%s|%p], [%d|%d|%c|%c|%p|%u|%p]} " fmt, \ |
| /* ----- extent part 0 ----- */ \ |
| __ext, EXTPARA(__ext), \ |
| /* ----- part 1 ----- */ \ |
| atomic_read(&__ext->oe_refc), \ |
| atomic_read(&__ext->oe_users), \ |
| list_empty_marker(&__ext->oe_link), \ |
| oes_strings[__ext->oe_state], ext_flags(__ext, __buf), \ |
| __ext->oe_obj, \ |
| /* ----- part 2 ----- */ \ |
| __ext->oe_grants, __ext->oe_nr_pages, \ |
| list_empty_marker(&__ext->oe_pages), \ |
| waitqueue_active(&__ext->oe_waitq) ? '+' : '-', \ |
| __ext->oe_osclock, __ext->oe_mppr, __ext->oe_owner, \ |
| /* ----- part 4 ----- */ \ |
| ## __VA_ARGS__); \ |
| } while (0) |
| |
| #undef EASSERTF |
| #define EASSERTF(expr, ext, fmt, args...) do { \ |
| if (!(expr)) { \ |
| OSC_EXTENT_DUMP(D_ERROR, (ext), fmt, ##args); \ |
| osc_extent_tree_dump(D_ERROR, (ext)->oe_obj); \ |
| LASSERT(expr); \ |
| } \ |
| } while (0) |
| |
| #undef EASSERT |
| #define EASSERT(expr, ext) EASSERTF(expr, ext, "\n") |
| |
| static inline struct osc_extent *rb_extent(struct rb_node *n) |
| { |
| if (n == NULL) |
| return NULL; |
| |
| return container_of(n, struct osc_extent, oe_node); |
| } |
| |
| static inline struct osc_extent *next_extent(struct osc_extent *ext) |
| { |
| if (ext == NULL) |
| return NULL; |
| |
| LASSERT(ext->oe_intree); |
| return rb_extent(rb_next(&ext->oe_node)); |
| } |
| |
| static inline struct osc_extent *prev_extent(struct osc_extent *ext) |
| { |
| if (ext == NULL) |
| return NULL; |
| |
| LASSERT(ext->oe_intree); |
| return rb_extent(rb_prev(&ext->oe_node)); |
| } |
| |
| static inline struct osc_extent *first_extent(struct osc_object *obj) |
| { |
| return rb_extent(rb_first(&obj->oo_root)); |
| } |
| |
| /* object must be locked by caller. */ |
| static int osc_extent_sanity_check0(struct osc_extent *ext, |
| const char *func, const int line) |
| { |
| struct osc_object *obj = ext->oe_obj; |
| struct osc_async_page *oap; |
| int page_count; |
| int rc = 0; |
| |
| if (!osc_object_is_locked(obj)) { |
| rc = 9; |
| goto out; |
| } |
| |
| if (ext->oe_state >= OES_STATE_MAX) { |
| rc = 10; |
| goto out; |
| } |
| |
| if (atomic_read(&ext->oe_refc) <= 0) { |
| rc = 20; |
| goto out; |
| } |
| |
| if (atomic_read(&ext->oe_refc) < atomic_read(&ext->oe_users)) { |
| rc = 30; |
| goto out; |
| } |
| |
| switch (ext->oe_state) { |
| case OES_INV: |
| if (ext->oe_nr_pages > 0 || !list_empty(&ext->oe_pages)) |
| rc = 35; |
| else |
| rc = 0; |
| goto out; |
| case OES_ACTIVE: |
| if (atomic_read(&ext->oe_users) == 0) { |
| rc = 40; |
| goto out; |
| } |
| if (ext->oe_hp) { |
| rc = 50; |
| goto out; |
| } |
| if (ext->oe_fsync_wait && !ext->oe_urgent) { |
| rc = 55; |
| goto out; |
| } |
| break; |
| case OES_CACHE: |
| if (ext->oe_grants == 0) { |
| rc = 60; |
| goto out; |
| } |
| if (ext->oe_fsync_wait && !ext->oe_urgent && !ext->oe_hp) { |
| rc = 65; |
| goto out; |
| } |
| default: |
| if (atomic_read(&ext->oe_users) > 0) { |
| rc = 70; |
| goto out; |
| } |
| } |
| |
| if (ext->oe_max_end < ext->oe_end || ext->oe_end < ext->oe_start) { |
| rc = 80; |
| goto out; |
| } |
| |
| if (ext->oe_osclock == NULL && ext->oe_grants > 0) { |
| rc = 90; |
| goto out; |
| } |
| |
| if (ext->oe_osclock) { |
| struct cl_lock_descr *descr; |
| descr = &ext->oe_osclock->cll_descr; |
| if (!(descr->cld_start <= ext->oe_start && |
| descr->cld_end >= ext->oe_max_end)) { |
| rc = 100; |
| goto out; |
| } |
| } |
| |
| if (ext->oe_nr_pages > ext->oe_mppr) { |
| rc = 105; |
| goto out; |
| } |
| |
| /* Do not verify page list if extent is in RPC. This is because an |
| * in-RPC extent is supposed to be exclusively accessible w/o lock. */ |
| if (ext->oe_state > OES_CACHE) { |
| rc = 0; |
| goto out; |
| } |
| |
| if (!extent_debug) { |
| rc = 0; |
| goto out; |
| } |
| |
| page_count = 0; |
| list_for_each_entry(oap, &ext->oe_pages, oap_pending_item) { |
| pgoff_t index = oap2cl_page(oap)->cp_index; |
| ++page_count; |
| if (index > ext->oe_end || index < ext->oe_start) { |
| rc = 110; |
| goto out; |
| } |
| } |
| if (page_count != ext->oe_nr_pages) { |
| rc = 120; |
| goto out; |
| } |
| |
| out: |
| if (rc != 0) |
| OSC_EXTENT_DUMP(D_ERROR, ext, |
| "%s:%d sanity check %p failed with rc = %d\n", |
| func, line, ext, rc); |
| return rc; |
| } |
| |
| #define sanity_check_nolock(ext) \ |
| osc_extent_sanity_check0(ext, __func__, __LINE__) |
| |
| #define sanity_check(ext) ({ \ |
| int __res; \ |
| osc_object_lock((ext)->oe_obj); \ |
| __res = sanity_check_nolock(ext); \ |
| osc_object_unlock((ext)->oe_obj); \ |
| __res; \ |
| }) |
| |
| |
| /** |
| * sanity check - to make sure there is no overlapped extent in the tree. |
| */ |
| static int osc_extent_is_overlapped(struct osc_object *obj, |
| struct osc_extent *ext) |
| { |
| struct osc_extent *tmp; |
| |
| LASSERT(osc_object_is_locked(obj)); |
| |
| if (!extent_debug) |
| return 0; |
| |
| for (tmp = first_extent(obj); tmp != NULL; tmp = next_extent(tmp)) { |
| if (tmp == ext) |
| continue; |
| if (tmp->oe_end >= ext->oe_start && |
| tmp->oe_start <= ext->oe_end) |
| return 1; |
| } |
| return 0; |
| } |
| |
| static void osc_extent_state_set(struct osc_extent *ext, int state) |
| { |
| LASSERT(osc_object_is_locked(ext->oe_obj)); |
| LASSERT(state >= OES_INV && state < OES_STATE_MAX); |
| |
| /* Never try to sanity check a state changing extent :-) */ |
| /* LASSERT(sanity_check_nolock(ext) == 0); */ |
| |
| /* TODO: validate the state machine */ |
| ext->oe_state = state; |
| wake_up_all(&ext->oe_waitq); |
| } |
| |
| static struct osc_extent *osc_extent_alloc(struct osc_object *obj) |
| { |
| struct osc_extent *ext; |
| |
| OBD_SLAB_ALLOC_PTR_GFP(ext, osc_extent_kmem, GFP_IOFS); |
| if (ext == NULL) |
| return NULL; |
| |
| RB_CLEAR_NODE(&ext->oe_node); |
| ext->oe_obj = obj; |
| atomic_set(&ext->oe_refc, 1); |
| atomic_set(&ext->oe_users, 0); |
| INIT_LIST_HEAD(&ext->oe_link); |
| ext->oe_state = OES_INV; |
| INIT_LIST_HEAD(&ext->oe_pages); |
| init_waitqueue_head(&ext->oe_waitq); |
| ext->oe_osclock = NULL; |
| |
| return ext; |
| } |
| |
| static void osc_extent_free(struct osc_extent *ext) |
| { |
| OBD_SLAB_FREE_PTR(ext, osc_extent_kmem); |
| } |
| |
| static struct osc_extent *osc_extent_get(struct osc_extent *ext) |
| { |
| LASSERT(atomic_read(&ext->oe_refc) >= 0); |
| atomic_inc(&ext->oe_refc); |
| return ext; |
| } |
| |
| static void osc_extent_put(const struct lu_env *env, struct osc_extent *ext) |
| { |
| LASSERT(atomic_read(&ext->oe_refc) > 0); |
| if (atomic_dec_and_test(&ext->oe_refc)) { |
| LASSERT(list_empty(&ext->oe_link)); |
| LASSERT(atomic_read(&ext->oe_users) == 0); |
| LASSERT(ext->oe_state == OES_INV); |
| LASSERT(!ext->oe_intree); |
| |
| if (ext->oe_osclock) { |
| cl_lock_put(env, ext->oe_osclock); |
| ext->oe_osclock = NULL; |
| } |
| osc_extent_free(ext); |
| } |
| } |
| |
| /** |
| * osc_extent_put_trust() is a special version of osc_extent_put() when |
| * it's known that the caller is not the last user. This is to address the |
| * problem of lacking of lu_env ;-). |
| */ |
| static void osc_extent_put_trust(struct osc_extent *ext) |
| { |
| LASSERT(atomic_read(&ext->oe_refc) > 1); |
| LASSERT(osc_object_is_locked(ext->oe_obj)); |
| atomic_dec(&ext->oe_refc); |
| } |
| |
| /** |
| * Return the extent which includes pgoff @index, or return the greatest |
| * previous extent in the tree. |
| */ |
| static struct osc_extent *osc_extent_search(struct osc_object *obj, |
| pgoff_t index) |
| { |
| struct rb_node *n = obj->oo_root.rb_node; |
| struct osc_extent *tmp, *p = NULL; |
| |
| LASSERT(osc_object_is_locked(obj)); |
| while (n != NULL) { |
| tmp = rb_extent(n); |
| if (index < tmp->oe_start) { |
| n = n->rb_left; |
| } else if (index > tmp->oe_end) { |
| p = rb_extent(n); |
| n = n->rb_right; |
| } else { |
| return tmp; |
| } |
| } |
| return p; |
| } |
| |
| /* |
| * Return the extent covering @index, otherwise return NULL. |
| * caller must have held object lock. |
| */ |
| static struct osc_extent *osc_extent_lookup(struct osc_object *obj, |
| pgoff_t index) |
| { |
| struct osc_extent *ext; |
| |
| ext = osc_extent_search(obj, index); |
| if (ext != NULL && ext->oe_start <= index && index <= ext->oe_end) |
| return osc_extent_get(ext); |
| return NULL; |
| } |
| |
| /* caller must have held object lock. */ |
| static void osc_extent_insert(struct osc_object *obj, struct osc_extent *ext) |
| { |
| struct rb_node **n = &obj->oo_root.rb_node; |
| struct rb_node *parent = NULL; |
| struct osc_extent *tmp; |
| |
| LASSERT(ext->oe_intree == 0); |
| LASSERT(ext->oe_obj == obj); |
| LASSERT(osc_object_is_locked(obj)); |
| while (*n != NULL) { |
| tmp = rb_extent(*n); |
| parent = *n; |
| |
| if (ext->oe_end < tmp->oe_start) |
| n = &(*n)->rb_left; |
| else if (ext->oe_start > tmp->oe_end) |
| n = &(*n)->rb_right; |
| else |
| EASSERTF(0, tmp, EXTSTR, EXTPARA(ext)); |
| } |
| rb_link_node(&ext->oe_node, parent, n); |
| rb_insert_color(&ext->oe_node, &obj->oo_root); |
| osc_extent_get(ext); |
| ext->oe_intree = 1; |
| } |
| |
| /* caller must have held object lock. */ |
| static void osc_extent_erase(struct osc_extent *ext) |
| { |
| struct osc_object *obj = ext->oe_obj; |
| LASSERT(osc_object_is_locked(obj)); |
| if (ext->oe_intree) { |
| rb_erase(&ext->oe_node, &obj->oo_root); |
| ext->oe_intree = 0; |
| /* rbtree held a refcount */ |
| osc_extent_put_trust(ext); |
| } |
| } |
| |
| static struct osc_extent *osc_extent_hold(struct osc_extent *ext) |
| { |
| struct osc_object *obj = ext->oe_obj; |
| |
| LASSERT(osc_object_is_locked(obj)); |
| LASSERT(ext->oe_state == OES_ACTIVE || ext->oe_state == OES_CACHE); |
| if (ext->oe_state == OES_CACHE) { |
| osc_extent_state_set(ext, OES_ACTIVE); |
| osc_update_pending(obj, OBD_BRW_WRITE, -ext->oe_nr_pages); |
| } |
| atomic_inc(&ext->oe_users); |
| list_del_init(&ext->oe_link); |
| return osc_extent_get(ext); |
| } |
| |
| static void __osc_extent_remove(struct osc_extent *ext) |
| { |
| LASSERT(osc_object_is_locked(ext->oe_obj)); |
| LASSERT(list_empty(&ext->oe_pages)); |
| osc_extent_erase(ext); |
| list_del_init(&ext->oe_link); |
| osc_extent_state_set(ext, OES_INV); |
| OSC_EXTENT_DUMP(D_CACHE, ext, "destroyed.\n"); |
| } |
| |
| static void osc_extent_remove(struct osc_extent *ext) |
| { |
| struct osc_object *obj = ext->oe_obj; |
| |
| osc_object_lock(obj); |
| __osc_extent_remove(ext); |
| osc_object_unlock(obj); |
| } |
| |
| /** |
| * This function is used to merge extents to get better performance. It checks |
| * if @cur and @victim are contiguous at chunk level. |
| */ |
| static int osc_extent_merge(const struct lu_env *env, struct osc_extent *cur, |
| struct osc_extent *victim) |
| { |
| struct osc_object *obj = cur->oe_obj; |
| pgoff_t chunk_start; |
| pgoff_t chunk_end; |
| int ppc_bits; |
| |
| LASSERT(cur->oe_state == OES_CACHE); |
| LASSERT(osc_object_is_locked(obj)); |
| if (victim == NULL) |
| return -EINVAL; |
| |
| if (victim->oe_state != OES_CACHE || victim->oe_fsync_wait) |
| return -EBUSY; |
| |
| if (cur->oe_max_end != victim->oe_max_end) |
| return -ERANGE; |
| |
| LASSERT(cur->oe_osclock == victim->oe_osclock); |
| ppc_bits = osc_cli(obj)->cl_chunkbits - PAGE_CACHE_SHIFT; |
| chunk_start = cur->oe_start >> ppc_bits; |
| chunk_end = cur->oe_end >> ppc_bits; |
| if (chunk_start != (victim->oe_end >> ppc_bits) + 1 && |
| chunk_end + 1 != victim->oe_start >> ppc_bits) |
| return -ERANGE; |
| |
| OSC_EXTENT_DUMP(D_CACHE, victim, "will be merged by %p.\n", cur); |
| |
| cur->oe_start = min(cur->oe_start, victim->oe_start); |
| cur->oe_end = max(cur->oe_end, victim->oe_end); |
| cur->oe_grants += victim->oe_grants; |
| cur->oe_nr_pages += victim->oe_nr_pages; |
| /* only the following bits are needed to merge */ |
| cur->oe_urgent |= victim->oe_urgent; |
| cur->oe_memalloc |= victim->oe_memalloc; |
| list_splice_init(&victim->oe_pages, &cur->oe_pages); |
| list_del_init(&victim->oe_link); |
| victim->oe_nr_pages = 0; |
| |
| osc_extent_get(victim); |
| __osc_extent_remove(victim); |
| osc_extent_put(env, victim); |
| |
| OSC_EXTENT_DUMP(D_CACHE, cur, "after merging %p.\n", victim); |
| return 0; |
| } |
| |
| /** |
| * Drop user count of osc_extent, and unplug IO asynchronously. |
| */ |
| void osc_extent_release(const struct lu_env *env, struct osc_extent *ext) |
| { |
| struct osc_object *obj = ext->oe_obj; |
| |
| LASSERT(atomic_read(&ext->oe_users) > 0); |
| LASSERT(sanity_check(ext) == 0); |
| LASSERT(ext->oe_grants > 0); |
| |
| if (atomic_dec_and_lock(&ext->oe_users, &obj->oo_lock)) { |
| LASSERT(ext->oe_state == OES_ACTIVE); |
| if (ext->oe_trunc_pending) { |
| /* a truncate process is waiting for this extent. |
| * This may happen due to a race, check |
| * osc_cache_truncate_start(). */ |
| osc_extent_state_set(ext, OES_TRUNC); |
| ext->oe_trunc_pending = 0; |
| } else { |
| osc_extent_state_set(ext, OES_CACHE); |
| osc_update_pending(obj, OBD_BRW_WRITE, |
| ext->oe_nr_pages); |
| |
| /* try to merge the previous and next extent. */ |
| osc_extent_merge(env, ext, prev_extent(ext)); |
| osc_extent_merge(env, ext, next_extent(ext)); |
| |
| if (ext->oe_urgent) |
| list_move_tail(&ext->oe_link, |
| &obj->oo_urgent_exts); |
| } |
| osc_object_unlock(obj); |
| |
| osc_io_unplug_async(env, osc_cli(obj), obj); |
| } |
| osc_extent_put(env, ext); |
| } |
| |
| static inline int overlapped(struct osc_extent *ex1, struct osc_extent *ex2) |
| { |
| return !(ex1->oe_end < ex2->oe_start || ex2->oe_end < ex1->oe_start); |
| } |
| |
| /** |
| * Find or create an extent which includes @index, core function to manage |
| * extent tree. |
| */ |
| struct osc_extent *osc_extent_find(const struct lu_env *env, |
| struct osc_object *obj, pgoff_t index, |
| int *grants) |
| |
| { |
| struct client_obd *cli = osc_cli(obj); |
| struct cl_lock *lock; |
| struct osc_extent *cur; |
| struct osc_extent *ext; |
| struct osc_extent *conflict = NULL; |
| struct osc_extent *found = NULL; |
| pgoff_t chunk; |
| pgoff_t max_end; |
| int max_pages; /* max_pages_per_rpc */ |
| int chunksize; |
| int ppc_bits; /* pages per chunk bits */ |
| int chunk_mask; |
| int rc; |
| |
| cur = osc_extent_alloc(obj); |
| if (cur == NULL) |
| return ERR_PTR(-ENOMEM); |
| |
| lock = cl_lock_at_pgoff(env, osc2cl(obj), index, NULL, 1, 0); |
| LASSERT(lock != NULL); |
| LASSERT(lock->cll_descr.cld_mode >= CLM_WRITE); |
| |
| LASSERT(cli->cl_chunkbits >= PAGE_CACHE_SHIFT); |
| ppc_bits = cli->cl_chunkbits - PAGE_CACHE_SHIFT; |
| chunk_mask = ~((1 << ppc_bits) - 1); |
| chunksize = 1 << cli->cl_chunkbits; |
| chunk = index >> ppc_bits; |
| |
| /* align end to rpc edge, rpc size may not be a power 2 integer. */ |
| max_pages = cli->cl_max_pages_per_rpc; |
| LASSERT((max_pages & ~chunk_mask) == 0); |
| max_end = index - (index % max_pages) + max_pages - 1; |
| max_end = min_t(pgoff_t, max_end, lock->cll_descr.cld_end); |
| |
| /* initialize new extent by parameters so far */ |
| cur->oe_max_end = max_end; |
| cur->oe_start = index & chunk_mask; |
| cur->oe_end = ((index + ~chunk_mask + 1) & chunk_mask) - 1; |
| if (cur->oe_start < lock->cll_descr.cld_start) |
| cur->oe_start = lock->cll_descr.cld_start; |
| if (cur->oe_end > max_end) |
| cur->oe_end = max_end; |
| cur->oe_osclock = lock; |
| cur->oe_grants = 0; |
| cur->oe_mppr = max_pages; |
| |
| /* grants has been allocated by caller */ |
| LASSERTF(*grants >= chunksize + cli->cl_extent_tax, |
| "%u/%u/%u.\n", *grants, chunksize, cli->cl_extent_tax); |
| LASSERTF((max_end - cur->oe_start) < max_pages, EXTSTR, EXTPARA(cur)); |
| |
| restart: |
| osc_object_lock(obj); |
| ext = osc_extent_search(obj, cur->oe_start); |
| if (ext == NULL) |
| ext = first_extent(obj); |
| while (ext != NULL) { |
| loff_t ext_chk_start = ext->oe_start >> ppc_bits; |
| loff_t ext_chk_end = ext->oe_end >> ppc_bits; |
| |
| LASSERT(sanity_check_nolock(ext) == 0); |
| if (chunk > ext_chk_end + 1) |
| break; |
| |
| /* if covering by different locks, no chance to match */ |
| if (lock != ext->oe_osclock) { |
| EASSERTF(!overlapped(ext, cur), ext, |
| EXTSTR, EXTPARA(cur)); |
| |
| ext = next_extent(ext); |
| continue; |
| } |
| |
| /* discontiguous chunks? */ |
| if (chunk + 1 < ext_chk_start) { |
| ext = next_extent(ext); |
| continue; |
| } |
| |
| /* ok, from now on, ext and cur have these attrs: |
| * 1. covered by the same lock |
| * 2. contiguous at chunk level or overlapping. */ |
| |
| if (overlapped(ext, cur)) { |
| /* cur is the minimum unit, so overlapping means |
| * full contain. */ |
| EASSERTF((ext->oe_start <= cur->oe_start && |
| ext->oe_end >= cur->oe_end), |
| ext, EXTSTR, EXTPARA(cur)); |
| |
| if (ext->oe_state > OES_CACHE || ext->oe_fsync_wait) { |
| /* for simplicity, we wait for this extent to |
| * finish before going forward. */ |
| conflict = osc_extent_get(ext); |
| break; |
| } |
| |
| found = osc_extent_hold(ext); |
| break; |
| } |
| |
| /* non-overlapped extent */ |
| if (ext->oe_state != OES_CACHE || ext->oe_fsync_wait) { |
| /* we can't do anything for a non OES_CACHE extent, or |
| * if there is someone waiting for this extent to be |
| * flushed, try next one. */ |
| ext = next_extent(ext); |
| continue; |
| } |
| |
| /* check if they belong to the same rpc slot before trying to |
| * merge. the extents are not overlapped and contiguous at |
| * chunk level to get here. */ |
| if (ext->oe_max_end != max_end) { |
| /* if they don't belong to the same RPC slot or |
| * max_pages_per_rpc has ever changed, do not merge. */ |
| ext = next_extent(ext); |
| continue; |
| } |
| |
| /* it's required that an extent must be contiguous at chunk |
| * level so that we know the whole extent is covered by grant |
| * (the pages in the extent are NOT required to be contiguous). |
| * Otherwise, it will be too much difficult to know which |
| * chunks have grants allocated. */ |
| |
| /* try to do front merge - extend ext's start */ |
| if (chunk + 1 == ext_chk_start) { |
| /* ext must be chunk size aligned */ |
| EASSERT((ext->oe_start & ~chunk_mask) == 0, ext); |
| |
| /* pull ext's start back to cover cur */ |
| ext->oe_start = cur->oe_start; |
| ext->oe_grants += chunksize; |
| *grants -= chunksize; |
| |
| found = osc_extent_hold(ext); |
| } else if (chunk == ext_chk_end + 1) { |
| /* rear merge */ |
| ext->oe_end = cur->oe_end; |
| ext->oe_grants += chunksize; |
| *grants -= chunksize; |
| |
| /* try to merge with the next one because we just fill |
| * in a gap */ |
| if (osc_extent_merge(env, ext, next_extent(ext)) == 0) |
| /* we can save extent tax from next extent */ |
| *grants += cli->cl_extent_tax; |
| |
| found = osc_extent_hold(ext); |
| } |
| if (found != NULL) |
| break; |
| |
| ext = next_extent(ext); |
| } |
| |
| osc_extent_tree_dump(D_CACHE, obj); |
| if (found != NULL) { |
| LASSERT(conflict == NULL); |
| if (!IS_ERR(found)) { |
| LASSERT(found->oe_osclock == cur->oe_osclock); |
| OSC_EXTENT_DUMP(D_CACHE, found, |
| "found caching ext for %lu.\n", index); |
| } |
| } else if (conflict == NULL) { |
| /* create a new extent */ |
| EASSERT(osc_extent_is_overlapped(obj, cur) == 0, cur); |
| cur->oe_grants = chunksize + cli->cl_extent_tax; |
| *grants -= cur->oe_grants; |
| LASSERT(*grants >= 0); |
| |
| cur->oe_state = OES_CACHE; |
| found = osc_extent_hold(cur); |
| osc_extent_insert(obj, cur); |
| OSC_EXTENT_DUMP(D_CACHE, cur, "add into tree %lu/%lu.\n", |
| index, lock->cll_descr.cld_end); |
| } |
| osc_object_unlock(obj); |
| |
| if (conflict != NULL) { |
| LASSERT(found == NULL); |
| |
| /* waiting for IO to finish. Please notice that it's impossible |
| * to be an OES_TRUNC extent. */ |
| rc = osc_extent_wait(env, conflict, OES_INV); |
| osc_extent_put(env, conflict); |
| conflict = NULL; |
| if (rc < 0) { |
| found = ERR_PTR(rc); |
| goto out; |
| } |
| |
| goto restart; |
| } |
| |
| out: |
| osc_extent_put(env, cur); |
| LASSERT(*grants >= 0); |
| return found; |
| } |
| |
| /** |
| * Called when IO is finished to an extent. |
| */ |
| int osc_extent_finish(const struct lu_env *env, struct osc_extent *ext, |
| int sent, int rc) |
| { |
| struct client_obd *cli = osc_cli(ext->oe_obj); |
| struct osc_async_page *oap; |
| struct osc_async_page *tmp; |
| int nr_pages = ext->oe_nr_pages; |
| int lost_grant = 0; |
| int blocksize = cli->cl_import->imp_obd->obd_osfs.os_bsize ? : 4096; |
| __u64 last_off = 0; |
| int last_count = -1; |
| |
| OSC_EXTENT_DUMP(D_CACHE, ext, "extent finished.\n"); |
| |
| ext->oe_rc = rc ?: ext->oe_nr_pages; |
| EASSERT(ergo(rc == 0, ext->oe_state == OES_RPC), ext); |
| list_for_each_entry_safe(oap, tmp, &ext->oe_pages, |
| oap_pending_item) { |
| list_del_init(&oap->oap_rpc_item); |
| list_del_init(&oap->oap_pending_item); |
| if (last_off <= oap->oap_obj_off) { |
| last_off = oap->oap_obj_off; |
| last_count = oap->oap_count; |
| } |
| |
| --ext->oe_nr_pages; |
| osc_ap_completion(env, cli, oap, sent, rc); |
| } |
| EASSERT(ext->oe_nr_pages == 0, ext); |
| |
| if (!sent) { |
| lost_grant = ext->oe_grants; |
| } else if (blocksize < PAGE_CACHE_SIZE && |
| last_count != PAGE_CACHE_SIZE) { |
| /* For short writes we shouldn't count parts of pages that |
| * span a whole chunk on the OST side, or our accounting goes |
| * wrong. Should match the code in filter_grant_check. */ |
| int offset = oap->oap_page_off & ~CFS_PAGE_MASK; |
| int count = oap->oap_count + (offset & (blocksize - 1)); |
| int end = (offset + oap->oap_count) & (blocksize - 1); |
| if (end) |
| count += blocksize - end; |
| |
| lost_grant = PAGE_CACHE_SIZE - count; |
| } |
| if (ext->oe_grants > 0) |
| osc_free_grant(cli, nr_pages, lost_grant); |
| |
| osc_extent_remove(ext); |
| /* put the refcount for RPC */ |
| osc_extent_put(env, ext); |
| return 0; |
| } |
| |
| static int extent_wait_cb(struct osc_extent *ext, int state) |
| { |
| int ret; |
| |
| osc_object_lock(ext->oe_obj); |
| ret = ext->oe_state == state; |
| osc_object_unlock(ext->oe_obj); |
| |
| return ret; |
| } |
| |
| /** |
| * Wait for the extent's state to become @state. |
| */ |
| static int osc_extent_wait(const struct lu_env *env, struct osc_extent *ext, |
| int state) |
| { |
| struct osc_object *obj = ext->oe_obj; |
| struct l_wait_info lwi = LWI_TIMEOUT_INTR(cfs_time_seconds(600), NULL, |
| LWI_ON_SIGNAL_NOOP, NULL); |
| int rc = 0; |
| |
| osc_object_lock(obj); |
| LASSERT(sanity_check_nolock(ext) == 0); |
| /* `Kick' this extent only if the caller is waiting for it to be |
| * written out. */ |
| if (state == OES_INV && !ext->oe_urgent && !ext->oe_hp && |
| !ext->oe_trunc_pending) { |
| if (ext->oe_state == OES_ACTIVE) { |
| ext->oe_urgent = 1; |
| } else if (ext->oe_state == OES_CACHE) { |
| ext->oe_urgent = 1; |
| osc_extent_hold(ext); |
| rc = 1; |
| } |
| } |
| osc_object_unlock(obj); |
| if (rc == 1) |
| osc_extent_release(env, ext); |
| |
| /* wait for the extent until its state becomes @state */ |
| rc = l_wait_event(ext->oe_waitq, extent_wait_cb(ext, state), &lwi); |
| if (rc == -ETIMEDOUT) { |
| OSC_EXTENT_DUMP(D_ERROR, ext, |
| "%s: wait ext to %d timedout, recovery in progress?\n", |
| osc_export(obj)->exp_obd->obd_name, state); |
| |
| lwi = LWI_INTR(LWI_ON_SIGNAL_NOOP, NULL); |
| rc = l_wait_event(ext->oe_waitq, extent_wait_cb(ext, state), |
| &lwi); |
| } |
| if (rc == 0 && ext->oe_rc < 0) |
| rc = ext->oe_rc; |
| return rc; |
| } |
| |
| /** |
| * Discard pages with index greater than @size. If @ext is overlapped with |
| * @size, then partial truncate happens. |
| */ |
| static int osc_extent_truncate(struct osc_extent *ext, pgoff_t trunc_index, |
| bool partial) |
| { |
| struct cl_env_nest nest; |
| struct lu_env *env; |
| struct cl_io *io; |
| struct osc_object *obj = ext->oe_obj; |
| struct client_obd *cli = osc_cli(obj); |
| struct osc_async_page *oap; |
| struct osc_async_page *tmp; |
| int pages_in_chunk = 0; |
| int ppc_bits = cli->cl_chunkbits - PAGE_CACHE_SHIFT; |
| __u64 trunc_chunk = trunc_index >> ppc_bits; |
| int grants = 0; |
| int nr_pages = 0; |
| int rc = 0; |
| |
| LASSERT(sanity_check(ext) == 0); |
| EASSERT(ext->oe_state == OES_TRUNC, ext); |
| EASSERT(!ext->oe_urgent, ext); |
| |
| /* Request new lu_env. |
| * We can't use that env from osc_cache_truncate_start() because |
| * it's from lov_io_sub and not fully initialized. */ |
| env = cl_env_nested_get(&nest); |
| io = &osc_env_info(env)->oti_io; |
| io->ci_obj = cl_object_top(osc2cl(obj)); |
| rc = cl_io_init(env, io, CIT_MISC, io->ci_obj); |
| if (rc < 0) |
| goto out; |
| |
| /* discard all pages with index greater then trunc_index */ |
| list_for_each_entry_safe(oap, tmp, &ext->oe_pages, |
| oap_pending_item) { |
| struct cl_page *sub = oap2cl_page(oap); |
| struct cl_page *page = cl_page_top(sub); |
| |
| LASSERT(list_empty(&oap->oap_rpc_item)); |
| |
| /* only discard the pages with their index greater than |
| * trunc_index, and ... */ |
| if (sub->cp_index < trunc_index || |
| (sub->cp_index == trunc_index && partial)) { |
| /* accounting how many pages remaining in the chunk |
| * so that we can calculate grants correctly. */ |
| if (sub->cp_index >> ppc_bits == trunc_chunk) |
| ++pages_in_chunk; |
| continue; |
| } |
| |
| list_del_init(&oap->oap_pending_item); |
| |
| cl_page_get(page); |
| lu_ref_add(&page->cp_reference, "truncate", current); |
| |
| if (cl_page_own(env, io, page) == 0) { |
| cl_page_unmap(env, io, page); |
| cl_page_discard(env, io, page); |
| cl_page_disown(env, io, page); |
| } else { |
| LASSERT(page->cp_state == CPS_FREEING); |
| LASSERT(0); |
| } |
| |
| lu_ref_del(&page->cp_reference, "truncate", current); |
| cl_page_put(env, page); |
| |
| --ext->oe_nr_pages; |
| ++nr_pages; |
| } |
| EASSERTF(ergo(ext->oe_start >= trunc_index + !!partial, |
| ext->oe_nr_pages == 0), |
| ext, "trunc_index %lu, partial %d\n", trunc_index, partial); |
| |
| osc_object_lock(obj); |
| if (ext->oe_nr_pages == 0) { |
| LASSERT(pages_in_chunk == 0); |
| grants = ext->oe_grants; |
| ext->oe_grants = 0; |
| } else { /* calculate how many grants we can free */ |
| int chunks = (ext->oe_end >> ppc_bits) - trunc_chunk; |
| pgoff_t last_index; |
| |
| |
| /* if there is no pages in this chunk, we can also free grants |
| * for the last chunk */ |
| if (pages_in_chunk == 0) { |
| /* if this is the 1st chunk and no pages in this chunk, |
| * ext->oe_nr_pages must be zero, so we should be in |
| * the other if-clause. */ |
| LASSERT(trunc_chunk > 0); |
| --trunc_chunk; |
| ++chunks; |
| } |
| |
| /* this is what we can free from this extent */ |
| grants = chunks << cli->cl_chunkbits; |
| ext->oe_grants -= grants; |
| last_index = ((trunc_chunk + 1) << ppc_bits) - 1; |
| ext->oe_end = min(last_index, ext->oe_max_end); |
| LASSERT(ext->oe_end >= ext->oe_start); |
| LASSERT(ext->oe_grants > 0); |
| } |
| osc_object_unlock(obj); |
| |
| if (grants > 0 || nr_pages > 0) |
| osc_free_grant(cli, nr_pages, grants); |
| |
| out: |
| cl_io_fini(env, io); |
| cl_env_nested_put(&nest, env); |
| return rc; |
| } |
| |
| /** |
| * This function is used to make the extent prepared for transfer. |
| * A race with flushing page - ll_writepage() has to be handled cautiously. |
| */ |
| static int osc_extent_make_ready(const struct lu_env *env, |
| struct osc_extent *ext) |
| { |
| struct osc_async_page *oap; |
| struct osc_async_page *last = NULL; |
| struct osc_object *obj = ext->oe_obj; |
| int page_count = 0; |
| int rc; |
| |
| /* we're going to grab page lock, so object lock must not be taken. */ |
| LASSERT(sanity_check(ext) == 0); |
| /* in locking state, any process should not touch this extent. */ |
| EASSERT(ext->oe_state == OES_LOCKING, ext); |
| EASSERT(ext->oe_owner != NULL, ext); |
| |
| OSC_EXTENT_DUMP(D_CACHE, ext, "make ready\n"); |
| |
| list_for_each_entry(oap, &ext->oe_pages, oap_pending_item) { |
| ++page_count; |
| if (last == NULL || last->oap_obj_off < oap->oap_obj_off) |
| last = oap; |
| |
| /* checking ASYNC_READY is race safe */ |
| if ((oap->oap_async_flags & ASYNC_READY) != 0) |
| continue; |
| |
| rc = osc_make_ready(env, oap, OBD_BRW_WRITE); |
| switch (rc) { |
| case 0: |
| spin_lock(&oap->oap_lock); |
| oap->oap_async_flags |= ASYNC_READY; |
| spin_unlock(&oap->oap_lock); |
| break; |
| case -EALREADY: |
| LASSERT((oap->oap_async_flags & ASYNC_READY) != 0); |
| break; |
| default: |
| LASSERTF(0, "unknown return code: %d\n", rc); |
| } |
| } |
| |
| LASSERT(page_count == ext->oe_nr_pages); |
| LASSERT(last != NULL); |
| /* the last page is the only one we need to refresh its count by |
| * the size of file. */ |
| if (!(last->oap_async_flags & ASYNC_COUNT_STABLE)) { |
| last->oap_count = osc_refresh_count(env, last, OBD_BRW_WRITE); |
| LASSERT(last->oap_count > 0); |
| LASSERT(last->oap_page_off + last->oap_count <= PAGE_CACHE_SIZE); |
| last->oap_async_flags |= ASYNC_COUNT_STABLE; |
| } |
| |
| /* for the rest of pages, we don't need to call osf_refresh_count() |
| * because it's known they are not the last page */ |
| list_for_each_entry(oap, &ext->oe_pages, oap_pending_item) { |
| if (!(oap->oap_async_flags & ASYNC_COUNT_STABLE)) { |
| oap->oap_count = PAGE_CACHE_SIZE - oap->oap_page_off; |
| oap->oap_async_flags |= ASYNC_COUNT_STABLE; |
| } |
| } |
| |
| osc_object_lock(obj); |
| osc_extent_state_set(ext, OES_RPC); |
| osc_object_unlock(obj); |
| /* get a refcount for RPC. */ |
| osc_extent_get(ext); |
| |
| return 0; |
| } |
| |
| /** |
| * Quick and simple version of osc_extent_find(). This function is frequently |
| * called to expand the extent for the same IO. To expand the extent, the |
| * page index must be in the same or next chunk of ext->oe_end. |
| */ |
| static int osc_extent_expand(struct osc_extent *ext, pgoff_t index, int *grants) |
| { |
| struct osc_object *obj = ext->oe_obj; |
| struct client_obd *cli = osc_cli(obj); |
| struct osc_extent *next; |
| int ppc_bits = cli->cl_chunkbits - PAGE_CACHE_SHIFT; |
| pgoff_t chunk = index >> ppc_bits; |
| pgoff_t end_chunk; |
| pgoff_t end_index; |
| int chunksize = 1 << cli->cl_chunkbits; |
| int rc = 0; |
| |
| LASSERT(ext->oe_max_end >= index && ext->oe_start <= index); |
| osc_object_lock(obj); |
| LASSERT(sanity_check_nolock(ext) == 0); |
| end_chunk = ext->oe_end >> ppc_bits; |
| if (chunk > end_chunk + 1) { |
| rc = -ERANGE; |
| goto out; |
| } |
| |
| if (end_chunk >= chunk) { |
| rc = 0; |
| goto out; |
| } |
| |
| LASSERT(end_chunk + 1 == chunk); |
| /* try to expand this extent to cover @index */ |
| end_index = min(ext->oe_max_end, ((chunk + 1) << ppc_bits) - 1); |
| |
| next = next_extent(ext); |
| if (next != NULL && next->oe_start <= end_index) { |
| /* complex mode - overlapped with the next extent, |
| * this case will be handled by osc_extent_find() */ |
| rc = -EAGAIN; |
| goto out; |
| } |
| |
| ext->oe_end = end_index; |
| ext->oe_grants += chunksize; |
| *grants -= chunksize; |
| LASSERT(*grants >= 0); |
| EASSERTF(osc_extent_is_overlapped(obj, ext) == 0, ext, |
| "overlapped after expanding for %lu.\n", index); |
| |
| out: |
| osc_object_unlock(obj); |
| return rc; |
| } |
| |
| static void osc_extent_tree_dump0(int level, struct osc_object *obj, |
| const char *func, int line) |
| { |
| struct osc_extent *ext; |
| int cnt; |
| |
| CDEBUG(level, "Dump object %p extents at %s:%d, mppr: %u.\n", |
| obj, func, line, osc_cli(obj)->cl_max_pages_per_rpc); |
| |
| /* osc_object_lock(obj); */ |
| cnt = 1; |
| for (ext = first_extent(obj); ext != NULL; ext = next_extent(ext)) |
| OSC_EXTENT_DUMP(level, ext, "in tree %d.\n", cnt++); |
| |
| cnt = 1; |
| list_for_each_entry(ext, &obj->oo_hp_exts, oe_link) |
| OSC_EXTENT_DUMP(level, ext, "hp %d.\n", cnt++); |
| |
| cnt = 1; |
| list_for_each_entry(ext, &obj->oo_urgent_exts, oe_link) |
| OSC_EXTENT_DUMP(level, ext, "urgent %d.\n", cnt++); |
| |
| cnt = 1; |
| list_for_each_entry(ext, &obj->oo_reading_exts, oe_link) |
| OSC_EXTENT_DUMP(level, ext, "reading %d.\n", cnt++); |
| /* osc_object_unlock(obj); */ |
| } |
| |
| /* ------------------ osc extent end ------------------ */ |
| |
| static inline int osc_is_ready(struct osc_object *osc) |
| { |
| return !list_empty(&osc->oo_ready_item) || |
| !list_empty(&osc->oo_hp_ready_item); |
| } |
| |
| #define OSC_IO_DEBUG(OSC, STR, args...) \ |
| CDEBUG(D_CACHE, "obj %p ready %d|%c|%c wr %d|%c|%c rd %d|%c " STR, \ |
| (OSC), osc_is_ready(OSC), \ |
| list_empty_marker(&(OSC)->oo_hp_ready_item), \ |
| list_empty_marker(&(OSC)->oo_ready_item), \ |
| atomic_read(&(OSC)->oo_nr_writes), \ |
| list_empty_marker(&(OSC)->oo_hp_exts), \ |
| list_empty_marker(&(OSC)->oo_urgent_exts), \ |
| atomic_read(&(OSC)->oo_nr_reads), \ |
| list_empty_marker(&(OSC)->oo_reading_exts), \ |
| ##args) |
| |
| static int osc_make_ready(const struct lu_env *env, struct osc_async_page *oap, |
| int cmd) |
| { |
| struct osc_page *opg = oap2osc_page(oap); |
| struct cl_page *page = cl_page_top(oap2cl_page(oap)); |
| int result; |
| |
| LASSERT(cmd == OBD_BRW_WRITE); /* no cached reads */ |
| |
| result = cl_page_make_ready(env, page, CRT_WRITE); |
| if (result == 0) |
| opg->ops_submit_time = cfs_time_current(); |
| return result; |
| } |
| |
| static int osc_refresh_count(const struct lu_env *env, |
| struct osc_async_page *oap, int cmd) |
| { |
| struct osc_page *opg = oap2osc_page(oap); |
| struct cl_page *page = oap2cl_page(oap); |
| struct cl_object *obj; |
| struct cl_attr *attr = &osc_env_info(env)->oti_attr; |
| |
| int result; |
| loff_t kms; |
| |
| /* readpage queues with _COUNT_STABLE, shouldn't get here. */ |
| LASSERT(!(cmd & OBD_BRW_READ)); |
| LASSERT(opg != NULL); |
| obj = opg->ops_cl.cpl_obj; |
| |
| cl_object_attr_lock(obj); |
| result = cl_object_attr_get(env, obj, attr); |
| cl_object_attr_unlock(obj); |
| if (result < 0) |
| return result; |
| kms = attr->cat_kms; |
| if (cl_offset(obj, page->cp_index) >= kms) |
| /* catch race with truncate */ |
| return 0; |
| else if (cl_offset(obj, page->cp_index + 1) > kms) |
| /* catch sub-page write at end of file */ |
| return kms % PAGE_CACHE_SIZE; |
| else |
| return PAGE_CACHE_SIZE; |
| } |
| |
| static int osc_completion(const struct lu_env *env, struct osc_async_page *oap, |
| int cmd, int rc) |
| { |
| struct osc_page *opg = oap2osc_page(oap); |
| struct cl_page *page = cl_page_top(oap2cl_page(oap)); |
| struct osc_object *obj = cl2osc(opg->ops_cl.cpl_obj); |
| enum cl_req_type crt; |
| int srvlock; |
| |
| cmd &= ~OBD_BRW_NOQUOTA; |
| LASSERT(equi(page->cp_state == CPS_PAGEIN, cmd == OBD_BRW_READ)); |
| LASSERT(equi(page->cp_state == CPS_PAGEOUT, cmd == OBD_BRW_WRITE)); |
| LASSERT(opg->ops_transfer_pinned); |
| |
| /* |
| * page->cp_req can be NULL if io submission failed before |
| * cl_req was allocated. |
| */ |
| if (page->cp_req != NULL) |
| cl_req_page_done(env, page); |
| LASSERT(page->cp_req == NULL); |
| |
| crt = cmd == OBD_BRW_READ ? CRT_READ : CRT_WRITE; |
| /* Clear opg->ops_transfer_pinned before VM lock is released. */ |
| opg->ops_transfer_pinned = 0; |
| |
| spin_lock(&obj->oo_seatbelt); |
| LASSERT(opg->ops_submitter != NULL); |
| LASSERT(!list_empty(&opg->ops_inflight)); |
| list_del_init(&opg->ops_inflight); |
| opg->ops_submitter = NULL; |
| spin_unlock(&obj->oo_seatbelt); |
| |
| opg->ops_submit_time = 0; |
| srvlock = oap->oap_brw_flags & OBD_BRW_SRVLOCK; |
| |
| /* statistic */ |
| if (rc == 0 && srvlock) { |
| struct lu_device *ld = opg->ops_cl.cpl_obj->co_lu.lo_dev; |
| struct osc_stats *stats = &lu2osc_dev(ld)->od_stats; |
| int bytes = oap->oap_count; |
| |
| if (crt == CRT_READ) |
| stats->os_lockless_reads += bytes; |
| else |
| stats->os_lockless_writes += bytes; |
| } |
| |
| /* |
| * This has to be the last operation with the page, as locks are |
| * released in cl_page_completion() and nothing except for the |
| * reference counter protects page from concurrent reclaim. |
| */ |
| lu_ref_del(&page->cp_reference, "transfer", page); |
| |
| cl_page_completion(env, page, crt, rc); |
| |
| return 0; |
| } |
| |
| #define OSC_DUMP_GRANT(cli, fmt, args...) do { \ |
| struct client_obd *__tmp = (cli); \ |
| CDEBUG(D_CACHE, "%s: { dirty: %ld/%ld dirty_pages: %d/%d " \ |
| "dropped: %ld avail: %ld, reserved: %ld, flight: %d } " fmt, \ |
| __tmp->cl_import->imp_obd->obd_name, \ |
| __tmp->cl_dirty, __tmp->cl_dirty_max, \ |
| atomic_read(&obd_dirty_pages), obd_max_dirty_pages, \ |
| __tmp->cl_lost_grant, __tmp->cl_avail_grant, \ |
| __tmp->cl_reserved_grant, __tmp->cl_w_in_flight, ##args); \ |
| } while (0) |
| |
| /* caller must hold loi_list_lock */ |
| static void osc_consume_write_grant(struct client_obd *cli, |
| struct brw_page *pga) |
| { |
| assert_spin_locked(&cli->cl_loi_list_lock.lock); |
| LASSERT(!(pga->flag & OBD_BRW_FROM_GRANT)); |
| atomic_inc(&obd_dirty_pages); |
| cli->cl_dirty += PAGE_CACHE_SIZE; |
| pga->flag |= OBD_BRW_FROM_GRANT; |
| CDEBUG(D_CACHE, "using %lu grant credits for brw %p page %p\n", |
| PAGE_CACHE_SIZE, pga, pga->pg); |
| osc_update_next_shrink(cli); |
| } |
| |
| /* the companion to osc_consume_write_grant, called when a brw has completed. |
| * must be called with the loi lock held. */ |
| static void osc_release_write_grant(struct client_obd *cli, |
| struct brw_page *pga) |
| { |
| assert_spin_locked(&cli->cl_loi_list_lock.lock); |
| if (!(pga->flag & OBD_BRW_FROM_GRANT)) { |
| return; |
| } |
| |
| pga->flag &= ~OBD_BRW_FROM_GRANT; |
| atomic_dec(&obd_dirty_pages); |
| cli->cl_dirty -= PAGE_CACHE_SIZE; |
| if (pga->flag & OBD_BRW_NOCACHE) { |
| pga->flag &= ~OBD_BRW_NOCACHE; |
| atomic_dec(&obd_dirty_transit_pages); |
| cli->cl_dirty_transit -= PAGE_CACHE_SIZE; |
| } |
| } |
| |
| /** |
| * To avoid sleeping with object lock held, it's good for us allocate enough |
| * grants before entering into critical section. |
| * |
| * client_obd_list_lock held by caller |
| */ |
| static int osc_reserve_grant(struct client_obd *cli, unsigned int bytes) |
| { |
| int rc = -EDQUOT; |
| |
| if (cli->cl_avail_grant >= bytes) { |
| cli->cl_avail_grant -= bytes; |
| cli->cl_reserved_grant += bytes; |
| rc = 0; |
| } |
| return rc; |
| } |
| |
| static void __osc_unreserve_grant(struct client_obd *cli, |
| unsigned int reserved, unsigned int unused) |
| { |
| /* it's quite normal for us to get more grant than reserved. |
| * Thinking about a case that two extents merged by adding a new |
| * chunk, we can save one extent tax. If extent tax is greater than |
| * one chunk, we can save more grant by adding a new chunk */ |
| cli->cl_reserved_grant -= reserved; |
| if (unused > reserved) { |
| cli->cl_avail_grant += reserved; |
| cli->cl_lost_grant += unused - reserved; |
| } else { |
| cli->cl_avail_grant += unused; |
| } |
| } |
| |
| void osc_unreserve_grant(struct client_obd *cli, |
| unsigned int reserved, unsigned int unused) |
| { |
| client_obd_list_lock(&cli->cl_loi_list_lock); |
| __osc_unreserve_grant(cli, reserved, unused); |
| if (unused > 0) |
| osc_wake_cache_waiters(cli); |
| client_obd_list_unlock(&cli->cl_loi_list_lock); |
| } |
| |
| /** |
| * Free grant after IO is finished or canceled. |
| * |
| * @lost_grant is used to remember how many grants we have allocated but not |
| * used, we should return these grants to OST. There're two cases where grants |
| * can be lost: |
| * 1. truncate; |
| * 2. blocksize at OST is less than PAGE_CACHE_SIZE and a partial page was |
| * written. In this case OST may use less chunks to serve this partial |
| * write. OSTs don't actually know the page size on the client side. so |
| * clients have to calculate lost grant by the blocksize on the OST. |
| * See filter_grant_check() for details. |
| */ |
| static void osc_free_grant(struct client_obd *cli, unsigned int nr_pages, |
| unsigned int lost_grant) |
| { |
| int grant = (1 << cli->cl_chunkbits) + cli->cl_extent_tax; |
| |
| client_obd_list_lock(&cli->cl_loi_list_lock); |
| atomic_sub(nr_pages, &obd_dirty_pages); |
| cli->cl_dirty -= nr_pages << PAGE_CACHE_SHIFT; |
| cli->cl_lost_grant += lost_grant; |
| if (cli->cl_avail_grant < grant && cli->cl_lost_grant >= grant) { |
| /* borrow some grant from truncate to avoid the case that |
| * truncate uses up all avail grant */ |
| cli->cl_lost_grant -= grant; |
| cli->cl_avail_grant += grant; |
| } |
| osc_wake_cache_waiters(cli); |
| client_obd_list_unlock(&cli->cl_loi_list_lock); |
| CDEBUG(D_CACHE, "lost %u grant: %lu avail: %lu dirty: %lu\n", |
| lost_grant, cli->cl_lost_grant, |
| cli->cl_avail_grant, cli->cl_dirty); |
| } |
| |
| /** |
| * The companion to osc_enter_cache(), called when @oap is no longer part of |
| * the dirty accounting due to error. |
| */ |
| static void osc_exit_cache(struct client_obd *cli, struct osc_async_page *oap) |
| { |
| client_obd_list_lock(&cli->cl_loi_list_lock); |
| osc_release_write_grant(cli, &oap->oap_brw_page); |
| client_obd_list_unlock(&cli->cl_loi_list_lock); |
| } |
| |
| /** |
| * Non-blocking version of osc_enter_cache() that consumes grant only when it |
| * is available. |
| */ |
| static int osc_enter_cache_try(struct client_obd *cli, |
| struct osc_async_page *oap, |
| int bytes, int transient) |
| { |
| int rc; |
| |
| OSC_DUMP_GRANT(cli, "need:%d.\n", bytes); |
| |
| rc = osc_reserve_grant(cli, bytes); |
| if (rc < 0) |
| return 0; |
| |
| if (cli->cl_dirty + PAGE_CACHE_SIZE <= cli->cl_dirty_max && |
| atomic_read(&obd_dirty_pages) + 1 <= obd_max_dirty_pages) { |
| osc_consume_write_grant(cli, &oap->oap_brw_page); |
| if (transient) { |
| cli->cl_dirty_transit += PAGE_CACHE_SIZE; |
| atomic_inc(&obd_dirty_transit_pages); |
| oap->oap_brw_flags |= OBD_BRW_NOCACHE; |
| } |
| rc = 1; |
| } else { |
| __osc_unreserve_grant(cli, bytes, bytes); |
| rc = 0; |
| } |
| return rc; |
| } |
| |
| static int ocw_granted(struct client_obd *cli, struct osc_cache_waiter *ocw) |
| { |
| int rc; |
| client_obd_list_lock(&cli->cl_loi_list_lock); |
| rc = list_empty(&ocw->ocw_entry); |
| client_obd_list_unlock(&cli->cl_loi_list_lock); |
| return rc; |
| } |
| |
| /** |
| * The main entry to reserve dirty page accounting. Usually the grant reserved |
| * in this function will be freed in bulk in osc_free_grant() unless it fails |
| * to add osc cache, in that case, it will be freed in osc_exit_cache(). |
| * |
| * The process will be put into sleep if it's already run out of grant. |
| */ |
| static int osc_enter_cache(const struct lu_env *env, struct client_obd *cli, |
| struct osc_async_page *oap, int bytes) |
| { |
| struct osc_object *osc = oap->oap_obj; |
| struct lov_oinfo *loi = osc->oo_oinfo; |
| struct osc_cache_waiter ocw; |
| struct l_wait_info lwi = LWI_INTR(LWI_ON_SIGNAL_NOOP, NULL); |
| int rc = -EDQUOT; |
| |
| OSC_DUMP_GRANT(cli, "need:%d.\n", bytes); |
| |
| client_obd_list_lock(&cli->cl_loi_list_lock); |
| |
| /* force the caller to try sync io. this can jump the list |
| * of queued writes and create a discontiguous rpc stream */ |
| if (OBD_FAIL_CHECK(OBD_FAIL_OSC_NO_GRANT) || |
| cli->cl_dirty_max < PAGE_CACHE_SIZE || |
| cli->cl_ar.ar_force_sync || loi->loi_ar.ar_force_sync) { |
| rc = -EDQUOT; |
| goto out; |
| } |
| |
| /* Hopefully normal case - cache space and write credits available */ |
| if (osc_enter_cache_try(cli, oap, bytes, 0)) { |
| rc = 0; |
| goto out; |
| } |
| |
| /* We can get here for two reasons: too many dirty pages in cache, or |
| * run out of grants. In both cases we should write dirty pages out. |
| * Adding a cache waiter will trigger urgent write-out no matter what |
| * RPC size will be. |
| * The exiting condition is no avail grants and no dirty pages caching, |
| * that really means there is no space on the OST. */ |
| init_waitqueue_head(&ocw.ocw_waitq); |
| ocw.ocw_oap = oap; |
| ocw.ocw_grant = bytes; |
| while (cli->cl_dirty > 0 || cli->cl_w_in_flight > 0) { |
| list_add_tail(&ocw.ocw_entry, &cli->cl_cache_waiters); |
| ocw.ocw_rc = 0; |
| client_obd_list_unlock(&cli->cl_loi_list_lock); |
| |
| osc_io_unplug_async(env, cli, NULL); |
| |
| CDEBUG(D_CACHE, "%s: sleeping for cache space @ %p for %p\n", |
| cli->cl_import->imp_obd->obd_name, &ocw, oap); |
| |
| rc = l_wait_event(ocw.ocw_waitq, ocw_granted(cli, &ocw), &lwi); |
| |
| client_obd_list_lock(&cli->cl_loi_list_lock); |
| |
| /* l_wait_event is interrupted by signal */ |
| if (rc < 0) { |
| list_del_init(&ocw.ocw_entry); |
| goto out; |
| } |
| |
| LASSERT(list_empty(&ocw.ocw_entry)); |
| rc = ocw.ocw_rc; |
| |
| if (rc != -EDQUOT) |
| goto out; |
| if (osc_enter_cache_try(cli, oap, bytes, 0)) { |
| rc = 0; |
| goto out; |
| } |
| } |
| out: |
| client_obd_list_unlock(&cli->cl_loi_list_lock); |
| OSC_DUMP_GRANT(cli, "returned %d.\n", rc); |
| return rc; |
| } |
| |
| /* caller must hold loi_list_lock */ |
| void osc_wake_cache_waiters(struct client_obd *cli) |
| { |
| struct list_head *l, *tmp; |
| struct osc_cache_waiter *ocw; |
| |
| list_for_each_safe(l, tmp, &cli->cl_cache_waiters) { |
| ocw = list_entry(l, struct osc_cache_waiter, ocw_entry); |
| list_del_init(&ocw->ocw_entry); |
| |
| ocw->ocw_rc = -EDQUOT; |
| /* we can't dirty more */ |
| if ((cli->cl_dirty + PAGE_CACHE_SIZE > cli->cl_dirty_max) || |
| (atomic_read(&obd_dirty_pages) + 1 > |
| obd_max_dirty_pages)) { |
| CDEBUG(D_CACHE, "no dirty room: dirty: %ld osc max %ld, sys max %d\n", |
| cli->cl_dirty, |
| cli->cl_dirty_max, obd_max_dirty_pages); |
| goto wakeup; |
| } |
| |
| ocw->ocw_rc = 0; |
| if (!osc_enter_cache_try(cli, ocw->ocw_oap, ocw->ocw_grant, 0)) |
| ocw->ocw_rc = -EDQUOT; |
| |
| wakeup: |
| CDEBUG(D_CACHE, "wake up %p for oap %p, avail grant %ld, %d\n", |
| ocw, ocw->ocw_oap, cli->cl_avail_grant, ocw->ocw_rc); |
| |
| wake_up(&ocw->ocw_waitq); |
| } |
| } |
| |
| static int osc_max_rpc_in_flight(struct client_obd *cli, struct osc_object *osc) |
| { |
| int hprpc = !!list_empty(&osc->oo_hp_exts); |
| return rpcs_in_flight(cli) >= cli->cl_max_rpcs_in_flight + hprpc; |
| } |
| |
| /* This maintains the lists of pending pages to read/write for a given object |
| * (lop). This is used by osc_check_rpcs->osc_next_obj() and osc_list_maint() |
| * to quickly find objects that are ready to send an RPC. */ |
| static int osc_makes_rpc(struct client_obd *cli, struct osc_object *osc, |
| int cmd) |
| { |
| int invalid_import = 0; |
| |
| /* if we have an invalid import we want to drain the queued pages |
| * by forcing them through rpcs that immediately fail and complete |
| * the pages. recovery relies on this to empty the queued pages |
| * before canceling the locks and evicting down the llite pages */ |
| if ((cli->cl_import == NULL || cli->cl_import->imp_invalid)) |
| invalid_import = 1; |
| |
| if (cmd & OBD_BRW_WRITE) { |
| if (atomic_read(&osc->oo_nr_writes) == 0) |
| return 0; |
| if (invalid_import) { |
| CDEBUG(D_CACHE, "invalid import forcing RPC\n"); |
| return 1; |
| } |
| if (!list_empty(&osc->oo_hp_exts)) { |
| CDEBUG(D_CACHE, "high prio request forcing RPC\n"); |
| return 1; |
| } |
| if (!list_empty(&osc->oo_urgent_exts)) { |
| CDEBUG(D_CACHE, "urgent request forcing RPC\n"); |
| return 1; |
| } |
| /* trigger a write rpc stream as long as there are dirtiers |
| * waiting for space. as they're waiting, they're not going to |
| * create more pages to coalesce with what's waiting.. */ |
| if (!list_empty(&cli->cl_cache_waiters)) { |
| CDEBUG(D_CACHE, "cache waiters forcing RPC\n"); |
| return 1; |
| } |
| if (atomic_read(&osc->oo_nr_writes) >= |
| cli->cl_max_pages_per_rpc) |
| return 1; |
| } else { |
| if (atomic_read(&osc->oo_nr_reads) == 0) |
| return 0; |
| if (invalid_import) { |
| CDEBUG(D_CACHE, "invalid import forcing RPC\n"); |
| return 1; |
| } |
| /* all read are urgent. */ |
| if (!list_empty(&osc->oo_reading_exts)) |
| return 1; |
| } |
| |
| return 0; |
| } |
| |
| static void osc_update_pending(struct osc_object *obj, int cmd, int delta) |
| { |
| struct client_obd *cli = osc_cli(obj); |
| if (cmd & OBD_BRW_WRITE) { |
| atomic_add(delta, &obj->oo_nr_writes); |
| atomic_add(delta, &cli->cl_pending_w_pages); |
| LASSERT(atomic_read(&obj->oo_nr_writes) >= 0); |
| } else { |
| atomic_add(delta, &obj->oo_nr_reads); |
| atomic_add(delta, &cli->cl_pending_r_pages); |
| LASSERT(atomic_read(&obj->oo_nr_reads) >= 0); |
| } |
| OSC_IO_DEBUG(obj, "update pending cmd %d delta %d.\n", cmd, delta); |
| } |
| |
| static int osc_makes_hprpc(struct osc_object *obj) |
| { |
| return !list_empty(&obj->oo_hp_exts); |
| } |
| |
| static void on_list(struct list_head *item, struct list_head *list, int should_be_on) |
| { |
| if (list_empty(item) && should_be_on) |
| list_add_tail(item, list); |
| else if (!list_empty(item) && !should_be_on) |
| list_del_init(item); |
| } |
| |
| /* maintain the osc's cli list membership invariants so that osc_send_oap_rpc |
| * can find pages to build into rpcs quickly */ |
| static int __osc_list_maint(struct client_obd *cli, struct osc_object *osc) |
| { |
| if (osc_makes_hprpc(osc)) { |
| /* HP rpc */ |
| on_list(&osc->oo_ready_item, &cli->cl_loi_ready_list, 0); |
| on_list(&osc->oo_hp_ready_item, &cli->cl_loi_hp_ready_list, 1); |
| } else { |
| on_list(&osc->oo_hp_ready_item, &cli->cl_loi_hp_ready_list, 0); |
| on_list(&osc->oo_ready_item, &cli->cl_loi_ready_list, |
| osc_makes_rpc(cli, osc, OBD_BRW_WRITE) || |
| osc_makes_rpc(cli, osc, OBD_BRW_READ)); |
| } |
| |
| on_list(&osc->oo_write_item, &cli->cl_loi_write_list, |
| atomic_read(&osc->oo_nr_writes) > 0); |
| |
| on_list(&osc->oo_read_item, &cli->cl_loi_read_list, |
| atomic_read(&osc->oo_nr_reads) > 0); |
| |
| return osc_is_ready(osc); |
| } |
| |
| static int osc_list_maint(struct client_obd *cli, struct osc_object *osc) |
| { |
| int is_ready; |
| |
| client_obd_list_lock(&cli->cl_loi_list_lock); |
| is_ready = __osc_list_maint(cli, osc); |
| client_obd_list_unlock(&cli->cl_loi_list_lock); |
| |
| return is_ready; |
| } |
| |
| /* this is trying to propagate async writeback errors back up to the |
| * application. As an async write fails we record the error code for later if |
| * the app does an fsync. As long as errors persist we force future rpcs to be |
| * sync so that the app can get a sync error and break the cycle of queueing |
| * pages for which writeback will fail. */ |
| static void osc_process_ar(struct osc_async_rc *ar, __u64 xid, |
| int rc) |
| { |
| if (rc) { |
| if (!ar->ar_rc) |
| ar->ar_rc = rc; |
| |
| ar->ar_force_sync = 1; |
| ar->ar_min_xid = ptlrpc_sample_next_xid(); |
| return; |
| |
| } |
| |
| if (ar->ar_force_sync && (xid >= ar->ar_min_xid)) |
| ar->ar_force_sync = 0; |
| } |
| |
| |
| /* this must be called holding the loi list lock to give coverage to exit_cache, |
| * async_flag maintenance, and oap_request */ |
| static void osc_ap_completion(const struct lu_env *env, struct client_obd *cli, |
| struct osc_async_page *oap, int sent, int rc) |
| { |
| struct osc_object *osc = oap->oap_obj; |
| struct lov_oinfo *loi = osc->oo_oinfo; |
| __u64 xid = 0; |
| |
| if (oap->oap_request != NULL) { |
| xid = ptlrpc_req_xid(oap->oap_request); |
| ptlrpc_req_finished(oap->oap_request); |
| oap->oap_request = NULL; |
| } |
| |
| /* As the transfer for this page is being done, clear the flags */ |
| spin_lock(&oap->oap_lock); |
| oap->oap_async_flags = 0; |
| spin_unlock(&oap->oap_lock); |
| oap->oap_interrupted = 0; |
| |
| if (oap->oap_cmd & OBD_BRW_WRITE && xid > 0) { |
| client_obd_list_lock(&cli->cl_loi_list_lock); |
| osc_process_ar(&cli->cl_ar, xid, rc); |
| osc_process_ar(&loi->loi_ar, xid, rc); |
| client_obd_list_unlock(&cli->cl_loi_list_lock); |
| } |
| |
| rc = osc_completion(env, oap, oap->oap_cmd, rc); |
| if (rc) |
| CERROR("completion on oap %p obj %p returns %d.\n", |
| oap, osc, rc); |
| } |
| |
| /** |
| * Try to add extent to one RPC. We need to think about the following things: |
| * - # of pages must not be over max_pages_per_rpc |
| * - extent must be compatible with previous ones |
| */ |
| static int try_to_add_extent_for_io(struct client_obd *cli, |
| struct osc_extent *ext, struct list_head *rpclist, |
| int *pc, unsigned int *max_pages) |
| { |
| struct osc_extent *tmp; |
| struct osc_async_page *oap = list_first_entry(&ext->oe_pages, |
| struct osc_async_page, |
| oap_pending_item); |
| |
| EASSERT((ext->oe_state == OES_CACHE || ext->oe_state == OES_LOCK_DONE), |
| ext); |
| |
| *max_pages = max(ext->oe_mppr, *max_pages); |
| if (*pc + ext->oe_nr_pages > *max_pages) |
| return 0; |
| |
| list_for_each_entry(tmp, rpclist, oe_link) { |
| struct osc_async_page *oap2; |
| |
| oap2 = list_first_entry(&tmp->oe_pages, struct osc_async_page, |
| oap_pending_item); |
| EASSERT(tmp->oe_owner == current, tmp); |
| if (oap2cl_page(oap)->cp_type != oap2cl_page(oap2)->cp_type) { |
| CDEBUG(D_CACHE, "Do not permit different type of IO" |
| " for a same RPC\n"); |
| return 0; |
| } |
| |
| if (tmp->oe_srvlock != ext->oe_srvlock || |
| !tmp->oe_grants != !ext->oe_grants) |
| return 0; |
| |
| /* remove break for strict check */ |
| break; |
| } |
| |
| *pc += ext->oe_nr_pages; |
| list_move_tail(&ext->oe_link, rpclist); |
| ext->oe_owner = current; |
| return 1; |
| } |
| |
| /** |
| * In order to prevent multiple ptlrpcd from breaking contiguous extents, |
| * get_write_extent() takes all appropriate extents in atomic. |
| * |
| * The following policy is used to collect extents for IO: |
| * 1. Add as many HP extents as possible; |
| * 2. Add the first urgent extent in urgent extent list and take it out of |
| * urgent list; |
| * 3. Add subsequent extents of this urgent extent; |
| * 4. If urgent list is not empty, goto 2; |
| * 5. Traverse the extent tree from the 1st extent; |
| * 6. Above steps exit if there is no space in this RPC. |
| */ |
| static int get_write_extents(struct osc_object *obj, struct list_head *rpclist) |
| { |
| struct client_obd *cli = osc_cli(obj); |
| struct osc_extent *ext; |
| int page_count = 0; |
| unsigned int max_pages = cli->cl_max_pages_per_rpc; |
| |
| LASSERT(osc_object_is_locked(obj)); |
| while (!list_empty(&obj->oo_hp_exts)) { |
| ext = list_entry(obj->oo_hp_exts.next, struct osc_extent, |
| oe_link); |
| LASSERT(ext->oe_state == OES_CACHE); |
| if (!try_to_add_extent_for_io(cli, ext, rpclist, &page_count, |
| &max_pages)) |
| return page_count; |
| EASSERT(ext->oe_nr_pages <= max_pages, ext); |
| } |
| if (page_count == max_pages) |
| return page_count; |
| |
| while (!list_empty(&obj->oo_urgent_exts)) { |
| ext = list_entry(obj->oo_urgent_exts.next, |
| struct osc_extent, oe_link); |
| if (!try_to_add_extent_for_io(cli, ext, rpclist, &page_count, |
| &max_pages)) |
| return page_count; |
| |
| if (!ext->oe_intree) |
| continue; |
| |
| while ((ext = next_extent(ext)) != NULL) { |
| if ((ext->oe_state != OES_CACHE) || |
| (!list_empty(&ext->oe_link) && |
| ext->oe_owner != NULL)) |
| continue; |
| |
| if (!try_to_add_extent_for_io(cli, ext, rpclist, |
| &page_count, &max_pages)) |
| return page_count; |
| } |
| } |
| if (page_count == max_pages) |
| return page_count; |
| |
| ext = first_extent(obj); |
| while (ext != NULL) { |
| if ((ext->oe_state != OES_CACHE) || |
| /* this extent may be already in current rpclist */ |
| (!list_empty(&ext->oe_link) && ext->oe_owner != NULL)) { |
| ext = next_extent(ext); |
| continue; |
| } |
| |
| if (!try_to_add_extent_for_io(cli, ext, rpclist, &page_count, |
| &max_pages)) |
| return page_count; |
| |
| ext = next_extent(ext); |
| } |
| return page_count; |
| } |
| |
| static int |
| osc_send_write_rpc(const struct lu_env *env, struct client_obd *cli, |
| struct osc_object *osc, pdl_policy_t pol) |
| { |
| LIST_HEAD(rpclist); |
| struct osc_extent *ext; |
| struct osc_extent *tmp; |
| struct osc_extent *first = NULL; |
| u32 page_count = 0; |
| int srvlock = 0; |
| int rc = 0; |
| |
| LASSERT(osc_object_is_locked(osc)); |
| |
| page_count = get_write_extents(osc, &rpclist); |
| LASSERT(equi(page_count == 0, list_empty(&rpclist))); |
| |
| if (list_empty(&rpclist)) |
| return 0; |
| |
| osc_update_pending(osc, OBD_BRW_WRITE, -page_count); |
| |
| list_for_each_entry(ext, &rpclist, oe_link) { |
| LASSERT(ext->oe_state == OES_CACHE || |
| ext->oe_state == OES_LOCK_DONE); |
| if (ext->oe_state == OES_CACHE) |
| osc_extent_state_set(ext, OES_LOCKING); |
| else |
| osc_extent_state_set(ext, OES_RPC); |
| } |
| |
| /* we're going to grab page lock, so release object lock because |
| * lock order is page lock -> object lock. */ |
| osc_object_unlock(osc); |
| |
| list_for_each_entry_safe(ext, tmp, &rpclist, oe_link) { |
| if (ext->oe_state == OES_LOCKING) { |
| rc = osc_extent_make_ready(env, ext); |
| if (unlikely(rc < 0)) { |
| list_del_init(&ext->oe_link); |
| osc_extent_finish(env, ext, 0, rc); |
| continue; |
| } |
| } |
| if (first == NULL) { |
| first = ext; |
| srvlock = ext->oe_srvlock; |
| } else { |
| LASSERT(srvlock == ext->oe_srvlock); |
| } |
| } |
| |
| if (!list_empty(&rpclist)) { |
| LASSERT(page_count > 0); |
| rc = osc_build_rpc(env, cli, &rpclist, OBD_BRW_WRITE, pol); |
| LASSERT(list_empty(&rpclist)); |
| } |
| |
| osc_object_lock(osc); |
| return rc; |
| } |
| |
| /** |
| * prepare pages for ASYNC io and put pages in send queue. |
| * |
| * \param cmd OBD_BRW_* macroses |
| * \param lop pending pages |
| * |
| * \return zero if no page added to send queue. |
| * \return 1 if pages successfully added to send queue. |
| * \return negative on errors. |
| */ |
| static int |
| osc_send_read_rpc(const struct lu_env *env, struct client_obd *cli, |
| struct osc_object *osc, pdl_policy_t pol) |
| { |
| struct osc_extent *ext; |
| struct osc_extent *next; |
| LIST_HEAD(rpclist); |
| int page_count = 0; |
| unsigned int max_pages = cli->cl_max_pages_per_rpc; |
| int rc = 0; |
| |
| LASSERT(osc_object_is_locked(osc)); |
| list_for_each_entry_safe(ext, next, |
| &osc->oo_reading_exts, oe_link) { |
| EASSERT(ext->oe_state == OES_LOCK_DONE, ext); |
| if (!try_to_add_extent_for_io(cli, ext, &rpclist, &page_count, |
| &max_pages)) |
| break; |
| osc_extent_state_set(ext, OES_RPC); |
| EASSERT(ext->oe_nr_pages <= max_pages, ext); |
| } |
| LASSERT(page_count <= max_pages); |
| |
| osc_update_pending(osc, OBD_BRW_READ, -page_count); |
| |
| if (!list_empty(&rpclist)) { |
| osc_object_unlock(osc); |
| |
| LASSERT(page_count > 0); |
| rc = osc_build_rpc(env, cli, &rpclist, OBD_BRW_READ, pol); |
| LASSERT(list_empty(&rpclist)); |
| |
| osc_object_lock(osc); |
| } |
| return rc; |
| } |
| |
| #define list_to_obj(list, item) ({ \ |
| struct list_head *__tmp = (list)->next; \ |
| list_del_init(__tmp); \ |
| list_entry(__tmp, struct osc_object, oo_##item); \ |
| }) |
| |
| /* This is called by osc_check_rpcs() to find which objects have pages that |
| * we could be sending. These lists are maintained by osc_makes_rpc(). */ |
| static struct osc_object *osc_next_obj(struct client_obd *cli) |
| { |
| /* First return objects that have blocked locks so that they |
| * will be flushed quickly and other clients can get the lock, |
| * then objects which have pages ready to be stuffed into RPCs */ |
| if (!list_empty(&cli->cl_loi_hp_ready_list)) |
| return list_to_obj(&cli->cl_loi_hp_ready_list, hp_ready_item); |
| if (!list_empty(&cli->cl_loi_ready_list)) |
| return list_to_obj(&cli->cl_loi_ready_list, ready_item); |
| |
| /* then if we have cache waiters, return all objects with queued |
| * writes. This is especially important when many small files |
| * have filled up the cache and not been fired into rpcs because |
| * they don't pass the nr_pending/object threshold */ |
| if (!list_empty(&cli->cl_cache_waiters) && |
| !list_empty(&cli->cl_loi_write_list)) |
| return list_to_obj(&cli->cl_loi_write_list, write_item); |
| |
| /* then return all queued objects when we have an invalid import |
| * so that they get flushed */ |
| if (cli->cl_import == NULL || cli->cl_import->imp_invalid) { |
| if (!list_empty(&cli->cl_loi_write_list)) |
| return list_to_obj(&cli->cl_loi_write_list, write_item); |
| if (!list_empty(&cli->cl_loi_read_list)) |
| return list_to_obj(&cli->cl_loi_read_list, read_item); |
| } |
| return NULL; |
| } |
| |
| /* called with the loi list lock held */ |
| static void osc_check_rpcs(const struct lu_env *env, struct client_obd *cli, |
| pdl_policy_t pol) |
| { |
| struct osc_object *osc; |
| int rc = 0; |
| |
| while ((osc = osc_next_obj(cli)) != NULL) { |
| struct cl_object *obj = osc2cl(osc); |
| struct lu_ref_link link; |
| |
| OSC_IO_DEBUG(osc, "%lu in flight\n", rpcs_in_flight(cli)); |
| |
| if (osc_max_rpc_in_flight(cli, osc)) { |
| __osc_list_maint(cli, osc); |
| break; |
| } |
| |
| cl_object_get(obj); |
| client_obd_list_unlock(&cli->cl_loi_list_lock); |
| lu_object_ref_add_at(&obj->co_lu, &link, "check", |
| current); |
| |
| /* attempt some read/write balancing by alternating between |
| * reads and writes in an object. The makes_rpc checks here |
| * would be redundant if we were getting read/write work items |
| * instead of objects. we don't want send_oap_rpc to drain a |
| * partial read pending queue when we're given this object to |
| * do io on writes while there are cache waiters */ |
| osc_object_lock(osc); |
| if (osc_makes_rpc(cli, osc, OBD_BRW_WRITE)) { |
| rc = osc_send_write_rpc(env, cli, osc, pol); |
| if (rc < 0) { |
| CERROR("Write request failed with %d\n", rc); |
| |
| /* osc_send_write_rpc failed, mostly because of |
| * memory pressure. |
| * |
| * It can't break here, because if: |
| * - a page was submitted by osc_io_submit, so |
| * page locked; |
| * - no request in flight |
| * - no subsequent request |
| * The system will be in live-lock state, |
| * because there is no chance to call |
| * osc_io_unplug() and osc_check_rpcs() any |
| * more. pdflush can't help in this case, |
| * because it might be blocked at grabbing |
| * the page lock as we mentioned. |
| * |
| * Anyway, continue to drain pages. */ |
| /* break; */ |
| } |
| } |
| if (osc_makes_rpc(cli, osc, OBD_BRW_READ)) { |
| rc = osc_send_read_rpc(env, cli, osc, pol); |
| if (rc < 0) |
| CERROR("Read request failed with %d\n", rc); |
| } |
| osc_object_unlock(osc); |
| |
| osc_list_maint(cli, osc); |
| lu_object_ref_del_at(&obj->co_lu, &link, "check", |
| current); |
| cl_object_put(env, obj); |
| |
| client_obd_list_lock(&cli->cl_loi_list_lock); |
| } |
| } |
| |
| static int osc_io_unplug0(const struct lu_env *env, struct client_obd *cli, |
| struct osc_object *osc, pdl_policy_t pol, int async) |
| { |
| int rc = 0; |
| |
| if (osc != NULL && osc_list_maint(cli, osc) == 0) |
| return 0; |
| |
| if (!async) { |
| /* disable osc_lru_shrink() temporarily to avoid |
| * potential stack overrun problem. LU-2859 */ |
| atomic_inc(&cli->cl_lru_shrinkers); |
| client_obd_list_lock(&cli->cl_loi_list_lock); |
| osc_check_rpcs(env, cli, pol); |
| client_obd_list_unlock(&cli->cl_loi_list_lock); |
| atomic_dec(&cli->cl_lru_shrinkers); |
| } else { |
| CDEBUG(D_CACHE, "Queue writeback work for client %p.\n", cli); |
| LASSERT(cli->cl_writeback_work != NULL); |
| rc = ptlrpcd_queue_work(cli->cl_writeback_work); |
| } |
| return rc; |
| } |
| |
| static int osc_io_unplug_async(const struct lu_env *env, |
| struct client_obd *cli, struct osc_object *osc) |
| { |
| /* XXX: policy is no use actually. */ |
| return osc_io_unplug0(env, cli, osc, PDL_POLICY_ROUND, 1); |
| } |
| |
| void osc_io_unplug(const struct lu_env *env, struct client_obd *cli, |
| struct osc_object *osc, pdl_policy_t pol) |
| { |
| (void)osc_io_unplug0(env, cli, osc, pol, 0); |
| } |
| |
| int osc_prep_async_page(struct osc_object *osc, struct osc_page *ops, |
| struct page *page, loff_t offset) |
| { |
| struct obd_export *exp = osc_export(osc); |
| struct osc_async_page *oap = &ops->ops_oap; |
| |
| if (!page) |
| return cfs_size_round(sizeof(*oap)); |
| |
| oap->oap_magic = OAP_MAGIC; |
| oap->oap_cli = &exp->exp_obd->u.cli; |
| oap->oap_obj = osc; |
| |
| oap->oap_page = page; |
| oap->oap_obj_off = offset; |
| LASSERT(!(offset & ~CFS_PAGE_MASK)); |
| |
| if (!client_is_remote(exp) && capable(CFS_CAP_SYS_RESOURCE)) |
| oap->oap_brw_flags = OBD_BRW_NOQUOTA; |
| |
| INIT_LIST_HEAD(&oap->oap_pending_item); |
| INIT_LIST_HEAD(&oap->oap_rpc_item); |
| |
| spin_lock_init(&oap->oap_lock); |
| CDEBUG(D_INFO, "oap %p page %p obj off %llu\n", |
| oap, page, oap->oap_obj_off); |
| return 0; |
| } |
| |
| int osc_queue_async_io(const struct lu_env *env, struct cl_io *io, |
| struct osc_page *ops) |
| { |
| struct osc_io *oio = osc_env_io(env); |
| struct osc_extent *ext = NULL; |
| struct osc_async_page *oap = &ops->ops_oap; |
| struct client_obd *cli = oap->oap_cli; |
| struct osc_object *osc = oap->oap_obj; |
| pgoff_t index; |
| int grants = 0; |
| int brw_flags = OBD_BRW_ASYNC; |
| int cmd = OBD_BRW_WRITE; |
| int need_release = 0; |
| int rc = 0; |
| |
| if (oap->oap_magic != OAP_MAGIC) |
| return -EINVAL; |
| |
| if (cli->cl_import == NULL || cli->cl_import->imp_invalid) |
| return -EIO; |
| |
| if (!list_empty(&oap->oap_pending_item) || |
| !list_empty(&oap->oap_rpc_item)) |
| return -EBUSY; |
| |
| /* Set the OBD_BRW_SRVLOCK before the page is queued. */ |
| brw_flags |= ops->ops_srvlock ? OBD_BRW_SRVLOCK : 0; |
| if (!client_is_remote(osc_export(osc)) && |
| capable(CFS_CAP_SYS_RESOURCE)) { |
| brw_flags |= OBD_BRW_NOQUOTA; |
| cmd |= OBD_BRW_NOQUOTA; |
| } |
| |
| /* check if the file's owner/group is over quota */ |
| if (!(cmd & OBD_BRW_NOQUOTA)) { |
| struct cl_object *obj; |
| struct cl_attr *attr; |
| unsigned int qid[MAXQUOTAS]; |
| |
| obj = cl_object_top(&osc->oo_cl); |
| attr = &osc_env_info(env)->oti_attr; |
| |
| cl_object_attr_lock(obj); |
| rc = cl_object_attr_get(env, obj, attr); |
| cl_object_attr_unlock(obj); |
| |
| qid[USRQUOTA] = attr->cat_uid; |
| qid[GRPQUOTA] = attr->cat_gid; |
| if (rc == 0 && osc_quota_chkdq(cli, qid) == NO_QUOTA) |
| rc = -EDQUOT; |
| if (rc) |
| return rc; |
| } |
| |
| oap->oap_cmd = cmd; |
| oap->oap_page_off = ops->ops_from; |
| oap->oap_count = ops->ops_to - ops->ops_from; |
| oap->oap_async_flags = 0; |
| oap->oap_brw_flags = brw_flags; |
| |
| OSC_IO_DEBUG(osc, "oap %p page %p added for cmd %d\n", |
| oap, oap->oap_page, oap->oap_cmd & OBD_BRW_RWMASK); |
| |
| index = oap2cl_page(oap)->cp_index; |
| |
| /* Add this page into extent by the following steps: |
| * 1. if there exists an active extent for this IO, mostly this page |
| * can be added to the active extent and sometimes we need to |
| * expand extent to accommodate this page; |
| * 2. otherwise, a new extent will be allocated. */ |
| |
| ext = oio->oi_active; |
| if (ext != NULL && ext->oe_start <= index && ext->oe_max_end >= index) { |
| /* one chunk plus extent overhead must be enough to write this |
| * page */ |
| grants = (1 << cli->cl_chunkbits) + cli->cl_extent_tax; |
| if (ext->oe_end >= index) |
| grants = 0; |
| |
| /* it doesn't need any grant to dirty this page */ |
| client_obd_list_lock(&cli->cl_loi_list_lock); |
| rc = osc_enter_cache_try(cli, oap, grants, 0); |
| client_obd_list_unlock(&cli->cl_loi_list_lock); |
| if (rc == 0) { /* try failed */ |
| grants = 0; |
| need_release = 1; |
| } else if (ext->oe_end < index) { |
| int tmp = grants; |
| /* try to expand this extent */ |
| rc = osc_extent_expand(ext, index, &tmp); |
| if (rc < 0) { |
| need_release = 1; |
| /* don't free reserved grant */ |
| } else { |
| OSC_EXTENT_DUMP(D_CACHE, ext, |
| "expanded for %lu.\n", index); |
| osc_unreserve_grant(cli, grants, tmp); |
| grants = 0; |
| } |
| } |
| rc = 0; |
| } else if (ext != NULL) { |
| /* index is located outside of active extent */ |
| need_release = 1; |
| } |
| if (need_release) { |
| osc_extent_release(env, ext); |
| oio->oi_active = NULL; |
| ext = NULL; |
| } |
| |
| if (ext == NULL) { |
| int tmp = (1 << cli->cl_chunkbits) + cli->cl_extent_tax; |
| |
| /* try to find new extent to cover this page */ |
| LASSERT(oio->oi_active == NULL); |
| /* we may have allocated grant for this page if we failed |
| * to expand the previous active extent. */ |
| LASSERT(ergo(grants > 0, grants >= tmp)); |
| |
| rc = 0; |
| if (grants == 0) { |
| /* we haven't allocated grant for this page. */ |
| rc = osc_enter_cache(env, cli, oap, tmp); |
| if (rc == 0) |
| grants = tmp; |
| } |
| |
| tmp = grants; |
| if (rc == 0) { |
| ext = osc_extent_find(env, osc, index, &tmp); |
| if (IS_ERR(ext)) { |
| LASSERT(tmp == grants); |
| osc_exit_cache(cli, oap); |
| rc = PTR_ERR(ext); |
| ext = NULL; |
| } else { |
| oio->oi_active = ext; |
| } |
| } |
| if (grants > 0) |
| osc_unreserve_grant(cli, grants, tmp); |
| } |
| |
| LASSERT(ergo(rc == 0, ext != NULL)); |
| if (ext != NULL) { |
| EASSERTF(ext->oe_end >= index && ext->oe_start <= index, |
| ext, "index = %lu.\n", index); |
| LASSERT((oap->oap_brw_flags & OBD_BRW_FROM_GRANT) != 0); |
| |
| osc_object_lock(osc); |
| if (ext->oe_nr_pages == 0) |
| ext->oe_srvlock = ops->ops_srvlock; |
| else |
| LASSERT(ext->oe_srvlock == ops->ops_srvlock); |
| ++ext->oe_nr_pages; |
| list_add_tail(&oap->oap_pending_item, &ext->oe_pages); |
| osc_object_unlock(osc); |
| } |
| return rc; |
| } |
| |
| int osc_teardown_async_page(const struct lu_env *env, |
| struct osc_object *obj, struct osc_page *ops) |
| { |
| struct osc_async_page *oap = &ops->ops_oap; |
| struct osc_extent *ext = NULL; |
| int rc = 0; |
| |
| LASSERT(oap->oap_magic == OAP_MAGIC); |
| |
| CDEBUG(D_INFO, "teardown oap %p page %p at index %lu.\n", |
| oap, ops, oap2cl_page(oap)->cp_index); |
| |
| osc_object_lock(obj); |
| if (!list_empty(&oap->oap_rpc_item)) { |
| CDEBUG(D_CACHE, "oap %p is not in cache.\n", oap); |
| rc = -EBUSY; |
| } else if (!list_empty(&oap->oap_pending_item)) { |
| ext = osc_extent_lookup(obj, oap2cl_page(oap)->cp_index); |
| /* only truncated pages are allowed to be taken out. |
| * See osc_extent_truncate() and osc_cache_truncate_start() |
| * for details. */ |
| if (ext != NULL && ext->oe_state != OES_TRUNC) { |
| OSC_EXTENT_DUMP(D_ERROR, ext, "trunc at %lu.\n", |
| oap2cl_page(oap)->cp_index); |
| rc = -EBUSY; |
| } |
| } |
| osc_object_unlock(obj); |
| if (ext != NULL) |
| osc_extent_put(env, ext); |
| return rc; |
| } |
| |
| /** |
| * This is called when a page is picked up by kernel to write out. |
| * |
| * We should find out the corresponding extent and add the whole extent |
| * into urgent list. The extent may be being truncated or used, handle it |
| * carefully. |
| */ |
| int osc_flush_async_page(const struct lu_env *env, struct cl_io *io, |
| struct osc_page *ops) |
| { |
| struct osc_extent *ext = NULL; |
| struct osc_object *obj = cl2osc(ops->ops_cl.cpl_obj); |
| struct cl_page *cp = ops->ops_cl.cpl_page; |
| pgoff_t index = cp->cp_index; |
| struct osc_async_page *oap = &ops->ops_oap; |
| bool unplug = false; |
| int rc = 0; |
| |
| osc_object_lock(obj); |
| ext = osc_extent_lookup(obj, index); |
| if (ext == NULL) { |
| osc_extent_tree_dump(D_ERROR, obj); |
| LASSERTF(0, "page index %lu is NOT covered.\n", index); |
| } |
| |
| switch (ext->oe_state) { |
| case OES_RPC: |
| case OES_LOCK_DONE: |
| CL_PAGE_DEBUG(D_ERROR, env, cl_page_top(cp), |
| "flush an in-rpc page?\n"); |
| LASSERT(0); |
| break; |
| case OES_LOCKING: |
| /* If we know this extent is being written out, we should abort |
| * so that the writer can make this page ready. Otherwise, there |
| * exists a deadlock problem because other process can wait for |
| * page writeback bit holding page lock; and meanwhile in |
| * vvp_page_make_ready(), we need to grab page lock before |
| * really sending the RPC. */ |
| case OES_TRUNC: |
| /* race with truncate, page will be redirtied */ |
| case OES_ACTIVE: |
| /* The extent is active so we need to abort and let the caller |
| * re-dirty the page. If we continued on here, and we were the |
| * one making the extent active, we could deadlock waiting for |
| * the page writeback to clear but it won't because the extent |
| * is active and won't be written out. */ |
| rc = -EAGAIN; |
| goto out; |
| default: |
| break; |
| } |
| |
| rc = cl_page_prep(env, io, cl_page_top(cp), CRT_WRITE); |
| if (rc) |
| goto out; |
| |
| spin_lock(&oap->oap_lock); |
| oap->oap_async_flags |= ASYNC_READY|ASYNC_URGENT; |
| spin_unlock(&oap->oap_lock); |
| |
| if (memory_pressure_get()) |
| ext->oe_memalloc = 1; |
| |
| ext->oe_urgent = 1; |
| if (ext->oe_state == OES_CACHE) { |
| OSC_EXTENT_DUMP(D_CACHE, ext, |
| "flush page %p make it urgent.\n", oap); |
| if (list_empty(&ext->oe_link)) |
| list_add_tail(&ext->oe_link, &obj->oo_urgent_exts); |
| unplug = true; |
| } |
| rc = 0; |
| |
| out: |
| osc_object_unlock(obj); |
| osc_extent_put(env, ext); |
| if (unplug) |
| osc_io_unplug_async(env, osc_cli(obj), obj); |
| return rc; |
| } |
| |
| /** |
| * this is called when a sync waiter receives an interruption. Its job is to |
| * get the caller woken as soon as possible. If its page hasn't been put in an |
| * rpc yet it can dequeue immediately. Otherwise it has to mark the rpc as |
| * desiring interruption which will forcefully complete the rpc once the rpc |
| * has timed out. |
| */ |
| int osc_cancel_async_page(const struct lu_env *env, struct osc_page *ops) |
| { |
| struct osc_async_page *oap = &ops->ops_oap; |
| struct osc_object *obj = oap->oap_obj; |
| struct client_obd *cli = osc_cli(obj); |
| struct osc_extent *ext; |
| struct osc_extent *found = NULL; |
| struct list_head *plist; |
| pgoff_t index = oap2cl_page(oap)->cp_index; |
| int rc = -EBUSY; |
| int cmd; |
| |
| LASSERT(!oap->oap_interrupted); |
| oap->oap_interrupted = 1; |
| |
| /* Find out the caching extent */ |
| osc_object_lock(obj); |
| if (oap->oap_cmd & OBD_BRW_WRITE) { |
| plist = &obj->oo_urgent_exts; |
| cmd = OBD_BRW_WRITE; |
| } else { |
| plist = &obj->oo_reading_exts; |
| cmd = OBD_BRW_READ; |
| } |
| list_for_each_entry(ext, plist, oe_link) { |
| if (ext->oe_start <= index && ext->oe_end >= index) { |
| LASSERT(ext->oe_state == OES_LOCK_DONE); |
| /* For OES_LOCK_DONE state extent, it has already held |
| * a refcount for RPC. */ |
| found = osc_extent_get(ext); |
| break; |
| } |
| } |
| if (found != NULL) { |
| list_del_init(&found->oe_link); |
| osc_update_pending(obj, cmd, -found->oe_nr_pages); |
| osc_object_unlock(obj); |
| |
| osc_extent_finish(env, found, 0, -EINTR); |
| osc_extent_put(env, found); |
| rc = 0; |
| } else { |
| osc_object_unlock(obj); |
| /* ok, it's been put in an rpc. only one oap gets a request |
| * reference */ |
| if (oap->oap_request != NULL) { |
| ptlrpc_mark_interrupted(oap->oap_request); |
| ptlrpcd_wake(oap->oap_request); |
| ptlrpc_req_finished(oap->oap_request); |
| oap->oap_request = NULL; |
| } |
| } |
| |
| osc_list_maint(cli, obj); |
| return rc; |
| } |
| |
| int osc_queue_sync_pages(const struct lu_env *env, struct osc_object *obj, |
| struct list_head *list, int cmd, int brw_flags) |
| { |
| struct client_obd *cli = osc_cli(obj); |
| struct osc_extent *ext; |
| struct osc_async_page *oap, *tmp; |
| int page_count = 0; |
| int mppr = cli->cl_max_pages_per_rpc; |
| pgoff_t start = CL_PAGE_EOF; |
| pgoff_t end = 0; |
| |
| list_for_each_entry(oap, list, oap_pending_item) { |
| struct cl_page *cp = oap2cl_page(oap); |
| if (cp->cp_index > end) |
| end = cp->cp_index; |
| if (cp->cp_index < start) |
| start = cp->cp_index; |
| ++page_count; |
| mppr <<= (page_count > mppr); |
| } |
| |
| ext = osc_extent_alloc(obj); |
| if (ext == NULL) { |
| list_for_each_entry_safe(oap, tmp, list, oap_pending_item) { |
| list_del_init(&oap->oap_pending_item); |
| osc_ap_completion(env, cli, oap, 0, -ENOMEM); |
| } |
| return -ENOMEM; |
| } |
| |
| ext->oe_rw = !!(cmd & OBD_BRW_READ); |
| ext->oe_urgent = 1; |
| ext->oe_start = start; |
| ext->oe_end = ext->oe_max_end = end; |
| ext->oe_obj = obj; |
| ext->oe_srvlock = !!(brw_flags & OBD_BRW_SRVLOCK); |
| ext->oe_nr_pages = page_count; |
| ext->oe_mppr = mppr; |
| list_splice_init(list, &ext->oe_pages); |
| |
| osc_object_lock(obj); |
| /* Reuse the initial refcount for RPC, don't drop it */ |
| osc_extent_state_set(ext, OES_LOCK_DONE); |
| if (cmd & OBD_BRW_WRITE) { |
| list_add_tail(&ext->oe_link, &obj->oo_urgent_exts); |
| osc_update_pending(obj, OBD_BRW_WRITE, page_count); |
| } else { |
| list_add_tail(&ext->oe_link, &obj->oo_reading_exts); |
| osc_update_pending(obj, OBD_BRW_READ, page_count); |
| } |
| osc_object_unlock(obj); |
| |
| osc_io_unplug_async(env, cli, obj); |
| return 0; |
| } |
| |
| /** |
| * Called by osc_io_setattr_start() to freeze and destroy covering extents. |
| */ |
| int osc_cache_truncate_start(const struct lu_env *env, struct osc_io *oio, |
| struct osc_object *obj, __u64 size) |
| { |
| struct client_obd *cli = osc_cli(obj); |
| struct osc_extent *ext; |
| struct osc_extent *waiting = NULL; |
| pgoff_t index; |
| LIST_HEAD(list); |
| int result = 0; |
| bool partial; |
| |
| /* pages with index greater or equal to index will be truncated. */ |
| index = cl_index(osc2cl(obj), size); |
| partial = size > cl_offset(osc2cl(obj), index); |
| |
| again: |
| osc_object_lock(obj); |
| ext = osc_extent_search(obj, index); |
| if (ext == NULL) |
| ext = first_extent(obj); |
| else if (ext->oe_end < index) |
| ext = next_extent(ext); |
| while (ext != NULL) { |
| EASSERT(ext->oe_state != OES_TRUNC, ext); |
| |
| if (ext->oe_state > OES_CACHE || ext->oe_urgent) { |
| /* if ext is in urgent state, it means there must exist |
| * a page already having been flushed by write_page(). |
| * We have to wait for this extent because we can't |
| * truncate that page. */ |
| LASSERT(!ext->oe_hp); |
| OSC_EXTENT_DUMP(D_CACHE, ext, |
| "waiting for busy extent\n"); |
| waiting = osc_extent_get(ext); |
| break; |
| } |
| |
| OSC_EXTENT_DUMP(D_CACHE, ext, "try to trunc:%llu.\n", size); |
| |
| osc_extent_get(ext); |
| if (ext->oe_state == OES_ACTIVE) { |
| /* though we grab inode mutex for write path, but we |
| * release it before releasing extent(in osc_io_end()), |
| * so there is a race window that an extent is still |
| * in OES_ACTIVE when truncate starts. */ |
| LASSERT(!ext->oe_trunc_pending); |
| ext->oe_trunc_pending = 1; |
| } else { |
| EASSERT(ext->oe_state == OES_CACHE, ext); |
| osc_extent_state_set(ext, OES_TRUNC); |
| osc_update_pending(obj, OBD_BRW_WRITE, |
| -ext->oe_nr_pages); |
| } |
| EASSERT(list_empty(&ext->oe_link), ext); |
| list_add_tail(&ext->oe_link, &list); |
| |
| ext = next_extent(ext); |
| } |
| osc_object_unlock(obj); |
| |
| osc_list_maint(cli, obj); |
| |
| while (!list_empty(&list)) { |
| int rc; |
| |
| ext = list_entry(list.next, struct osc_extent, oe_link); |
| list_del_init(&ext->oe_link); |
| |
| /* extent may be in OES_ACTIVE state because inode mutex |
| * is released before osc_io_end() in file write case */ |
| if (ext->oe_state != OES_TRUNC) |
| osc_extent_wait(env, ext, OES_TRUNC); |
| |
| rc = osc_extent_truncate(ext, index, partial); |
| if (rc < 0) { |
| if (result == 0) |
| result = rc; |
| |
| OSC_EXTENT_DUMP(D_ERROR, ext, |
| "truncate error %d\n", rc); |
| } else if (ext->oe_nr_pages == 0) { |
| osc_extent_remove(ext); |
| } else { |
| /* this must be an overlapped extent which means only |
| * part of pages in this extent have been truncated. |
| */ |
| EASSERTF(ext->oe_start <= index, ext, |
| "trunc index = %lu/%d.\n", index, partial); |
| /* fix index to skip this partially truncated extent */ |
| index = ext->oe_end + 1; |
| partial = false; |
| |
| /* we need to hold this extent in OES_TRUNC state so |
| * that no writeback will happen. This is to avoid |
| * BUG 17397. */ |
| LASSERT(oio->oi_trunc == NULL); |
| oio->oi_trunc = osc_extent_get(ext); |
| OSC_EXTENT_DUMP(D_CACHE, ext, |
| "trunc at %llu\n", size); |
| } |
| osc_extent_put(env, ext); |
| } |
| if (waiting != NULL) { |
| int rc; |
| |
| /* ignore the result of osc_extent_wait the write initiator |
| * should take care of it. */ |
| rc = osc_extent_wait(env, waiting, OES_INV); |
| if (rc < 0) |
| OSC_EXTENT_DUMP(D_CACHE, waiting, "error: %d.\n", rc); |
| |
| osc_extent_put(env, waiting); |
| waiting = NULL; |
| goto again; |
| } |
| return result; |
| } |
| |
| /** |
| * Called after osc_io_setattr_end to add oio->oi_trunc back to cache. |
| */ |
| void osc_cache_truncate_end(const struct lu_env *env, struct osc_io *oio, |
| struct osc_object *obj) |
| { |
| struct osc_extent *ext = oio->oi_trunc; |
| |
| oio->oi_trunc = NULL; |
| if (ext != NULL) { |
| bool unplug = false; |
| |
| EASSERT(ext->oe_nr_pages > 0, ext); |
| EASSERT(ext->oe_state == OES_TRUNC, ext); |
| EASSERT(!ext->oe_urgent, ext); |
| |
| OSC_EXTENT_DUMP(D_CACHE, ext, "trunc -> cache.\n"); |
| osc_object_lock(obj); |
| osc_extent_state_set(ext, OES_CACHE); |
| if (ext->oe_fsync_wait && !ext->oe_urgent) { |
| ext->oe_urgent = 1; |
| list_move_tail(&ext->oe_link, &obj->oo_urgent_exts); |
| unplug = true; |
| } |
| osc_update_pending(obj, OBD_BRW_WRITE, ext->oe_nr_pages); |
| osc_object_unlock(obj); |
| osc_extent_put(env, ext); |
| |
| if (unplug) |
| osc_io_unplug_async(env, osc_cli(obj), obj); |
| } |
| } |
| |
| /** |
| * Wait for extents in a specific range to be written out. |
| * The caller must have called osc_cache_writeback_range() to issue IO |
| * otherwise it will take a long time for this function to finish. |
| * |
| * Caller must hold inode_mutex , or cancel exclusive dlm lock so that |
| * nobody else can dirty this range of file while we're waiting for |
| * extents to be written. |
| */ |
| int osc_cache_wait_range(const struct lu_env *env, struct osc_object *obj, |
| pgoff_t start, pgoff_t end) |
| { |
| struct osc_extent *ext; |
| pgoff_t index = start; |
| int result = 0; |
| |
| again: |
| osc_object_lock(obj); |
| ext = osc_extent_search(obj, index); |
| if (ext == NULL) |
| ext = first_extent(obj); |
| else if (ext->oe_end < index) |
| ext = next_extent(ext); |
| while (ext != NULL) { |
| int rc; |
| |
| if (ext->oe_start > end) |
| break; |
| |
| if (!ext->oe_fsync_wait) { |
| ext = next_extent(ext); |
| continue; |
| } |
| |
| EASSERT(ergo(ext->oe_state == OES_CACHE, |
| ext->oe_hp || ext->oe_urgent), ext); |
| EASSERT(ergo(ext->oe_state == OES_ACTIVE, |
| !ext->oe_hp && ext->oe_urgent), ext); |
| |
| index = ext->oe_end + 1; |
| osc_extent_get(ext); |
| osc_object_unlock(obj); |
| |
| rc = osc_extent_wait(env, ext, OES_INV); |
| if (result == 0) |
| result = rc; |
| osc_extent_put(env, ext); |
| goto again; |
| } |
| osc_object_unlock(obj); |
| |
| OSC_IO_DEBUG(obj, "sync file range.\n"); |
| return result; |
| } |
| |
| /** |
| * Called to write out a range of osc object. |
| * |
| * @hp : should be set this is caused by lock cancel; |
| * @discard: is set if dirty pages should be dropped - file will be deleted or |
| * truncated, this implies there is no partially discarding extents. |
| * |
| * Return how many pages will be issued, or error code if error occurred. |
| */ |
| int osc_cache_writeback_range(const struct lu_env *env, struct osc_object *obj, |
| pgoff_t start, pgoff_t end, int hp, int discard) |
| { |
| struct osc_extent *ext; |
| LIST_HEAD(discard_list); |
| bool unplug = false; |
| int result = 0; |
| |
| osc_object_lock(obj); |
| ext = osc_extent_search(obj, start); |
| if (ext == NULL) |
| ext = first_extent(obj); |
| else if (ext->oe_end < start) |
| ext = next_extent(ext); |
| while (ext != NULL) { |
| if (ext->oe_start > end) |
| break; |
| |
| ext->oe_fsync_wait = 1; |
| switch (ext->oe_state) { |
| case OES_CACHE: |
| result += ext->oe_nr_pages; |
| if (!discard) { |
| struct list_head *list = NULL; |
| if (hp) { |
| EASSERT(!ext->oe_hp, ext); |
| ext->oe_hp = 1; |
| list = &obj->oo_hp_exts; |
| } else if (!ext->oe_urgent) { |
| ext->oe_urgent = 1; |
| list = &obj->oo_urgent_exts; |
| } |
| if (list != NULL) |
| list_move_tail(&ext->oe_link, list); |
| unplug = true; |
| } else { |
| /* the only discarder is lock cancelling, so |
| * [start, end] must contain this extent */ |
| EASSERT(ext->oe_start >= start && |
| ext->oe_max_end <= end, ext); |
| osc_extent_state_set(ext, OES_LOCKING); |
| ext->oe_owner = current; |
| list_move_tail(&ext->oe_link, |
| &discard_list); |
| osc_update_pending(obj, OBD_BRW_WRITE, |
| -ext->oe_nr_pages); |
| } |
| break; |
| case OES_ACTIVE: |
| /* It's pretty bad to wait for ACTIVE extents, because |
| * we don't know how long we will wait for it to be |
| * flushed since it may be blocked at awaiting more |
| * grants. We do this for the correctness of fsync. */ |
| LASSERT(hp == 0 && discard == 0); |
| ext->oe_urgent = 1; |
| break; |
| case OES_TRUNC: |
| /* this extent is being truncated, can't do anything |
| * for it now. it will be set to urgent after truncate |
| * is finished in osc_cache_truncate_end(). */ |
| default: |
| break; |
| } |
| ext = next_extent(ext); |
| } |
| osc_object_unlock(obj); |
| |
| LASSERT(ergo(!discard, list_empty(&discard_list))); |
| if (!list_empty(&discard_list)) { |
| struct osc_extent *tmp; |
| int rc; |
| |
| osc_list_maint(osc_cli(obj), obj); |
| list_for_each_entry_safe(ext, tmp, &discard_list, oe_link) { |
| list_del_init(&ext->oe_link); |
| EASSERT(ext->oe_state == OES_LOCKING, ext); |
| |
| /* Discard caching pages. We don't actually write this |
| * extent out but we complete it as if we did. */ |
| rc = osc_extent_make_ready(env, ext); |
| if (unlikely(rc < 0)) { |
| OSC_EXTENT_DUMP(D_ERROR, ext, |
| "make_ready returned %d\n", rc); |
| if (result >= 0) |
| result = rc; |
| } |
| |
| /* finish the extent as if the pages were sent */ |
| osc_extent_finish(env, ext, 0, 0); |
| } |
| } |
| |
| if (unplug) |
| osc_io_unplug(env, osc_cli(obj), obj, PDL_POLICY_ROUND); |
| |
| if (hp || discard) { |
| int rc; |
| rc = osc_cache_wait_range(env, obj, start, end); |
| if (result >= 0 && rc < 0) |
| result = rc; |
| } |
| |
| OSC_IO_DEBUG(obj, "cache page out.\n"); |
| return result; |
| } |
| |
| /** @} osc */ |