X-Git-Url: https://git.whamcloud.com/?p=fs%2Flustre-release.git;a=blobdiff_plain;f=lustre%2Fosc%2Fosc_cache.c;h=4d97b3e028be984345aa987486338db13b63f49f;hp=9f12ad6ae857973aea7610f44553dea90e2718e7;hb=27815a0611a2e315a9a7696a20c2f257d48aeb7e;hpb=364c4cdb58ed75996017d35dcbbc7e7acc6d076e diff --git a/lustre/osc/osc_cache.c b/lustre/osc/osc_cache.c index 9f12ad6..4d97b3e 100644 --- a/lustre/osc/osc_cache.c +++ b/lustre/osc/osc_cache.c @@ -1,6 +1,4 @@ -/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*- - * vim:expandtab:shiftwidth=8:tabstop=8: - * +/* * GPL HEADER START * * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. @@ -29,7 +27,7 @@ * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved. * Use is subject to license terms. * - * Copyright (c) 2011 Whamcloud, Inc. + * Copyright (c) 2012, 2013, Intel Corporation. * */ /* @@ -41,42 +39,1175 @@ * Author: Jinshan Xiong */ -#define DEBUG_SUBSYSTEM S_OSC +#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(cfs_list_t *list) +{ + return cfs_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 ----- */ \ + cfs_atomic_read(&__ext->oe_refc), \ + cfs_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)) + GOTO(out, rc = 9); + + if (ext->oe_state >= OES_STATE_MAX) + GOTO(out, rc = 10); + + if (cfs_atomic_read(&ext->oe_refc) <= 0) + GOTO(out, rc = 20); + + if (cfs_atomic_read(&ext->oe_refc) < cfs_atomic_read(&ext->oe_users)) + GOTO(out, rc = 30); + + switch (ext->oe_state) { + case OES_INV: + if (ext->oe_nr_pages > 0 || !cfs_list_empty(&ext->oe_pages)) + GOTO(out, rc = 35); + GOTO(out, rc = 0); + break; + case OES_ACTIVE: + if (cfs_atomic_read(&ext->oe_users) == 0) + GOTO(out, rc = 40); + if (ext->oe_hp) + GOTO(out, rc = 50); + if (ext->oe_fsync_wait && !ext->oe_urgent) + GOTO(out, rc = 55); + break; + case OES_CACHE: + if (ext->oe_grants == 0) + GOTO(out, rc = 60); + if (ext->oe_fsync_wait && !ext->oe_urgent && !ext->oe_hp) + GOTO(out, rc = 65); + default: + if (cfs_atomic_read(&ext->oe_users) > 0) + GOTO(out, rc = 70); + } + + if (ext->oe_max_end < ext->oe_end || ext->oe_end < ext->oe_start) + GOTO(out, rc = 80); + + if (ext->oe_osclock == NULL && ext->oe_grants > 0) + GOTO(out, rc = 90); + + 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)) + GOTO(out, rc = 100); + } + + if (ext->oe_nr_pages > ext->oe_mppr) + GOTO(out, rc = 105); + + /* 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) + GOTO(out, rc = 0); + + if (!extent_debug) + GOTO(out, rc = 0); + + page_count = 0; + cfs_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) + GOTO(out, rc = 110); + } + if (page_count != ext->oe_nr_pages) + GOTO(out, rc = 120); + +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; + cfs_atomic_set(&ext->oe_refc, 1); + cfs_atomic_set(&ext->oe_users, 0); + CFS_INIT_LIST_HEAD(&ext->oe_link); + ext->oe_state = OES_INV; + CFS_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(cfs_atomic_read(&ext->oe_refc) >= 0); + cfs_atomic_inc(&ext->oe_refc); + return ext; +} + +static void osc_extent_put(const struct lu_env *env, struct osc_extent *ext) +{ + LASSERT(cfs_atomic_read(&ext->oe_refc) > 0); + if (cfs_atomic_dec_and_test(&ext->oe_refc)) { + LASSERT(cfs_list_empty(&ext->oe_link)); + LASSERT(cfs_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(cfs_atomic_read(&ext->oe_refc) > 1); + LASSERT(osc_object_is_locked(ext->oe_obj)); + cfs_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); + } + cfs_atomic_inc(&ext->oe_users); + cfs_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(cfs_list_empty(&ext->oe_pages)); + osc_extent_erase(ext); + cfs_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; + cfs_list_splice_init(&victim->oe_pages, &cur->oe_pages); + cfs_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. + */ +int osc_extent_release(const struct lu_env *env, struct osc_extent *ext) +{ + struct osc_object *obj = ext->oe_obj; + int rc = 0; + ENTRY; + + LASSERT(cfs_atomic_read(&ext->oe_users) > 0); + LASSERT(sanity_check(ext) == 0); + LASSERT(ext->oe_grants > 0); + + if (cfs_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) + cfs_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); + RETURN(rc); +} + +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; + ENTRY; + + 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) + GOTO(out, found = ERR_PTR(rc)); + + goto restart; + } + EXIT; + +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; + ENTRY; + + 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); + cfs_list_for_each_entry_safe(oap, tmp, &ext->oe_pages, + oap_pending_item) { + cfs_list_del_init(&oap->oap_rpc_item); + cfs_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; + ENTRY; + + 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) { + 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(NULL, 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; + ENTRY; + + LASSERT(sanity_check(ext) == 0); + LASSERT(ext->oe_state == OES_TRUNC); + LASSERT(!ext->oe_urgent); + + /* 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, rc); + + /* discard all pages with index greater then trunc_index */ + cfs_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(cfs_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; + } + + cfs_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 flusing 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; + ENTRY; + + /* 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"); + + cfs_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); + spin_lock(&last->oap_lock); + last->oap_async_flags |= ASYNC_COUNT_STABLE; + spin_unlock(&last->oap_lock); + } + + /* for the rest of pages, we don't need to call osf_refresh_count() + * because it's known they are not the last page */ + cfs_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; + spin_lock(&oap->oap_lock); + oap->oap_async_flags |= ASYNC_COUNT_STABLE; + spin_unlock(&oap->oap_lock); + } + } + + 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; + ENTRY; + + 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) + GOTO(out, rc = -ERANGE); + + if (end_chunk >= chunk) + GOTO(out, rc = 0); + + 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() */ + GOTO(out, rc = -EAGAIN); + + 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); + EXIT; -#include "osc_cl_internal.h" -#include "osc_internal.h" +out: + osc_object_unlock(obj); + RETURN(rc); +} -static int osc_enter_cache(const struct lu_env *env, struct client_obd *cli, - struct osc_async_page *oap); -static int osc_enter_cache_try(const struct lu_env *env, struct client_obd *cli, - struct osc_async_page *oap, int transient); -static void osc_exit_cache(struct client_obd *cli, struct osc_async_page *oap, - int sent); +static void osc_extent_tree_dump0(int level, struct osc_object *obj, + const char *func, int line) +{ + struct osc_extent *ext; + int cnt; -/** \addtogroup osc - * @{ - */ + 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; + cfs_list_for_each_entry(ext, &obj->oo_hp_exts, oe_link) + OSC_EXTENT_DUMP(level, ext, "hp %d.\n", cnt++); -#define OSC_IO_DEBUG(OSC, STR, args...) \ - CDEBUG(D_INODE, "loi ready %d wr %d:%d rd %d:%d " STR, \ - !cfs_list_empty(&(OSC)->oo_ready_item) || \ - !cfs_list_empty(&(OSC)->oo_hp_ready_item), \ - (OSC)->oo_write_pages.oop_num_pending, \ - !cfs_list_empty(&(OSC)->oo_write_pages.oop_urgent), \ - (OSC)->oo_read_pages.oop_num_pending, \ - !cfs_list_empty(&(OSC)->oo_read_pages.oop_urgent), \ - args) + cnt = 1; + cfs_list_for_each_entry(ext, &obj->oo_urgent_exts, oe_link) + OSC_EXTENT_DUMP(level, ext, "urgent %d.\n", cnt++); -static inline struct osc_page *oap2osc_page(struct osc_async_page *oap) + cnt = 1; + cfs_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 (struct osc_page *)container_of(oap, struct osc_page, ops_oap); + return !cfs_list_empty(&osc->oo_ready_item) || + !cfs_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), \ + cfs_atomic_read(&(OSC)->oo_nr_writes), \ + list_empty_marker(&(OSC)->oo_hp_exts), \ + list_empty_marker(&(OSC)->oo_urgent_exts), \ + cfs_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(opg->ops_cl.cpl_page); + struct cl_page *page = cl_page_top(oap2cl_page(oap)); int result; LASSERT(cmd == OBD_BRW_WRITE); /* no cached reads */ @@ -92,7 +1223,7 @@ 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; + struct cl_page *page = oap2cl_page(oap); struct cl_object *obj; struct cl_attr *attr = &osc_env_info(env)->oti_attr; @@ -102,7 +1233,6 @@ static int osc_refresh_count(const struct lu_env *env, /* readpage queues with _COUNT_STABLE, shouldn't get here. */ LASSERT(!(cmd & OBD_BRW_READ)); LASSERT(opg != NULL); - page = opg->ops_cl.cpl_page; obj = opg->ops_cl.cpl_obj; cl_object_attr_lock(obj); @@ -116,16 +1246,16 @@ static int osc_refresh_count(const struct lu_env *env, return 0; else if (cl_offset(obj, page->cp_index + 1) > kms) /* catch sub-page write at end of file */ - return kms % CFS_PAGE_SIZE; + return kms % PAGE_CACHE_SIZE; else - return CFS_PAGE_SIZE; + return PAGE_CACHE_SIZE; } static int osc_completion(const struct lu_env *env, struct osc_async_page *oap, - int cmd, struct obdo *oa, int rc) + int cmd, int rc) { struct osc_page *opg = oap2osc_page(oap); - struct cl_page *page = cl_page_top(opg->ops_cl.cpl_page); + 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; @@ -133,8 +1263,10 @@ static int osc_completion(const struct lu_env *env, struct osc_async_page *oap, ENTRY; 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)); + LASSERTF(equi(page->cp_state == CPS_PAGEIN, cmd == OBD_BRW_READ), + "cp_state:%u, cmd:%d\n", page->cp_state, cmd); + LASSERTF(equi(page->cp_state == CPS_PAGEOUT, cmd == OBD_BRW_WRITE), + "cp_state:%u, cmd:%d\n", page->cp_state, cmd); LASSERT(opg->ops_transfer_pinned); /* @@ -145,26 +1277,20 @@ static int osc_completion(const struct lu_env *env, struct osc_async_page *oap, cl_req_page_done(env, page); LASSERT(page->cp_req == NULL); - /* As the transfer for this page is being done, clear the flags */ - cfs_spin_lock(&oap->oap_lock); - oap->oap_async_flags = 0; - cfs_spin_unlock(&oap->oap_lock); - crt = cmd == OBD_BRW_READ ? CRT_READ : CRT_WRITE; /* Clear opg->ops_transfer_pinned before VM lock is released. */ opg->ops_transfer_pinned = 0; - cfs_spin_lock(&obj->oo_seatbelt); + spin_lock(&obj->oo_seatbelt); LASSERT(opg->ops_submitter != NULL); LASSERT(!cfs_list_empty(&opg->ops_inflight)); cfs_list_del_init(&opg->ops_inflight); - cfs_spin_unlock(&obj->oo_seatbelt); + opg->ops_submitter = NULL; + spin_unlock(&obj->oo_seatbelt); opg->ops_submit_time = 0; srvlock = oap->oap_brw_flags & OBD_BRW_SRVLOCK; - cl_page_completion(env, page, crt, rc); - /* statistic */ if (rc == 0 && srvlock) { struct lu_device *ld = opg->ops_cl.cpl_obj->co_lu.lo_dev; @@ -183,40 +1309,51 @@ static int osc_completion(const struct lu_env *env, struct osc_async_page *oap, * reference counter protects page from concurrent reclaim. */ lu_ref_del(&page->cp_reference, "transfer", page); - /* - * As page->cp_obj is pinned by a reference from page->cp_req, it is - * safe to call cl_page_put() without risking object destruction in a - * non-blocking context. - */ - cl_page_put(env, page); + + cl_page_completion(env, page, crt, rc); + RETURN(0); } +#define OSC_DUMP_GRANT(lvl, cli, fmt, args...) do { \ + struct client_obd *__tmp = (cli); \ + CDEBUG(lvl, "%s: grant { dirty: %ld/%ld dirty_pages: %d/%d " \ + "unstable_pages: %d/%d dropped: %ld avail: %ld, " \ + "reserved: %ld, flight: %d } lru {in list: %d, " \ + "left: %d, waiters: %d }" fmt, \ + __tmp->cl_import->imp_obd->obd_name, \ + __tmp->cl_dirty, __tmp->cl_dirty_max, \ + cfs_atomic_read(&obd_dirty_pages), obd_max_dirty_pages, \ + cfs_atomic_read(&obd_unstable_pages), obd_max_dirty_pages, \ + __tmp->cl_lost_grant, __tmp->cl_avail_grant, \ + __tmp->cl_reserved_grant, __tmp->cl_w_in_flight, \ + cfs_atomic_read(&__tmp->cl_lru_in_list), \ + cfs_atomic_read(&__tmp->cl_lru_busy), \ + cfs_atomic_read(&__tmp->cl_lru_shrinkers), ##args); \ +} while (0) + /* caller must hold loi_list_lock */ static void osc_consume_write_grant(struct client_obd *cli, struct brw_page *pga) { - LASSERT_SPIN_LOCKED(&cli->cl_loi_list_lock.lock); + LASSERT(spin_is_locked(&cli->cl_loi_list_lock.lock)); LASSERT(!(pga->flag & OBD_BRW_FROM_GRANT)); cfs_atomic_inc(&obd_dirty_pages); - cli->cl_dirty += CFS_PAGE_SIZE; - cli->cl_avail_grant -= CFS_PAGE_SIZE; + 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", - CFS_PAGE_SIZE, pga, pga->pg); - LASSERT(cli->cl_avail_grant >= 0); + 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, int sent) + struct brw_page *pga) { - int blocksize = cli->cl_import->imp_obd->obd_osfs.os_bsize ? : 4096; ENTRY; - LASSERT_SPIN_LOCKED(&cli->cl_loi_list_lock.lock); + LASSERT(spin_is_locked(&cli->cl_loi_list_lock.lock)); if (!(pga->flag & OBD_BRW_FROM_GRANT)) { EXIT; return; @@ -224,103 +1361,179 @@ static void osc_release_write_grant(struct client_obd *cli, pga->flag &= ~OBD_BRW_FROM_GRANT; cfs_atomic_dec(&obd_dirty_pages); - cli->cl_dirty -= CFS_PAGE_SIZE; + cli->cl_dirty -= PAGE_CACHE_SIZE; if (pga->flag & OBD_BRW_NOCACHE) { pga->flag &= ~OBD_BRW_NOCACHE; cfs_atomic_dec(&obd_dirty_transit_pages); - cli->cl_dirty_transit -= CFS_PAGE_SIZE; + cli->cl_dirty_transit -= PAGE_CACHE_SIZE; } - if (!sent) { - /* Reclaim grant from truncated pages. This is used to solve - * write-truncate and grant all gone(to lost_grant) problem. - * For a vfs write this problem can be easily solved by a sync - * write, however, this is not an option for page_mkwrite() - * because grant has to be allocated before a page becomes - * dirty. */ - if (cli->cl_avail_grant < PTLRPC_MAX_BRW_SIZE) - cli->cl_avail_grant += CFS_PAGE_SIZE; - else - cli->cl_lost_grant += CFS_PAGE_SIZE; - CDEBUG(D_CACHE, "lost grant: %lu avail grant: %lu dirty: %lu\n", - cli->cl_lost_grant, cli->cl_avail_grant, cli->cl_dirty); - } else if (CFS_PAGE_SIZE != blocksize && pga->count != CFS_PAGE_SIZE) { - /* For short writes we shouldn't count parts of pages that - * span a whole block on the OST side, or our accounting goes - * wrong. Should match the code in filter_grant_check. */ - int offset = pga->off & ~CFS_PAGE_MASK; - int count = pga->count + (offset & (blocksize - 1)); - int end = (offset + pga->count) & (blocksize - 1); - if (end) - count += blocksize - end; + EXIT; +} + +/** + * 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; +} - cli->cl_lost_grant += CFS_PAGE_SIZE - count; - CDEBUG(D_CACHE, "lost %lu grant: %lu avail: %lu dirty: %lu\n", - CFS_PAGE_SIZE - count, cli->cl_lost_grant, - cli->cl_avail_grant, cli->cl_dirty); +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; } +} - EXIT; +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); + cfs_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. Writeback completes or truncate happens before - * writing starts. Must be called with the loi lock held. */ -static void osc_exit_cache(struct client_obd *cli, struct osc_async_page *oap, - int sent) +/** + * 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) { - osc_release_write_grant(cli, &oap->oap_brw_page, sent); + 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(const struct lu_env *env, struct client_obd *cli, - struct osc_async_page *oap, int transient) +static int osc_enter_cache_try(struct client_obd *cli, + struct osc_async_page *oap, + int bytes, int transient) { - int has_grant; + int rc; + + OSC_DUMP_GRANT(D_CACHE, cli, "need:%d.\n", bytes); + + rc = osc_reserve_grant(cli, bytes); + if (rc < 0) + return 0; - has_grant = cli->cl_avail_grant >= CFS_PAGE_SIZE; - if (has_grant) { + if (cli->cl_dirty + PAGE_CACHE_SIZE <= cli->cl_dirty_max && + cfs_atomic_read(&obd_unstable_pages) + 1 + + cfs_atomic_read(&obd_dirty_pages) <= obd_max_dirty_pages) { osc_consume_write_grant(cli, &oap->oap_brw_page); if (transient) { - cli->cl_dirty_transit += CFS_PAGE_SIZE; + cli->cl_dirty_transit += PAGE_CACHE_SIZE; cfs_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 has_grant; + 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 = cfs_list_empty(&ocw->ocw_entry); + client_obd_list_unlock(&cli->cl_loi_list_lock); + return rc; } -/* Caller must hold loi_list_lock - we drop/regain it if we need to wait for - * grant or cache space. */ +/** + * 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) + 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); + struct l_wait_info lwi = LWI_TIMEOUT_INTR(cfs_time_seconds(600), NULL, + LWI_ON_SIGNAL_NOOP, NULL); int rc = -EDQUOT; ENTRY; - CDEBUG(D_CACHE, "dirty: %ld/%d dirty_max: %ld/%d dropped: %lu " - "grant: %lu\n", cli->cl_dirty, cfs_atomic_read(&obd_dirty_pages), - cli->cl_dirty_max, obd_max_dirty_pages, - cli->cl_lost_grant, cli->cl_avail_grant); + OSC_DUMP_GRANT(D_CACHE, 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 < CFS_PAGE_SIZE || + cli->cl_dirty_max < PAGE_CACHE_SIZE || cli->cl_ar.ar_force_sync || loi->loi_ar.ar_force_sync) - RETURN(-EDQUOT); + GOTO(out, rc = -EDQUOT); /* Hopefully normal case - cache space and write credits available */ - if (cli->cl_dirty + CFS_PAGE_SIZE <= cli->cl_dirty_max && - cfs_atomic_read(&obd_dirty_pages) + 1 <= obd_max_dirty_pages && - osc_enter_cache_try(env, cli, oap, 0)) - RETURN(0); + if (osc_enter_cache_try(cli, oap, bytes, 0)) + GOTO(out, rc = 0); /* 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. @@ -328,31 +1541,59 @@ static int osc_enter_cache(const struct lu_env *env, struct client_obd *cli, * 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. */ - cfs_waitq_init(&ocw.ocw_waitq); - ocw.ocw_oap = oap; - while (cli->cl_dirty > 0) { + 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) { cfs_list_add_tail(&ocw.ocw_entry, &cli->cl_cache_waiters); ocw.ocw_rc = 0; - - osc_io_unplug(env, cli, osc, PDL_POLICY_ROUND); 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, cfs_list_empty(&ocw.ocw_entry), - &lwi); + rc = l_wait_event(ocw.ocw_waitq, ocw_granted(cli, &ocw), &lwi); client_obd_list_lock(&cli->cl_loi_list_lock); - cfs_list_del_init(&ocw.ocw_entry); - if (rc < 0) - break; + /* l_wait_event is interrupted by signal, or timed out */ + if (rc < 0) { + switch (rc) { + case -ETIMEDOUT: + OSC_DUMP_GRANT(D_ERROR, cli, + "try to reserve %d.\n", bytes); + osc_extent_tree_dump(D_ERROR, osc); + rc = -EDQUOT; + break; + case -EINTR: + /* Ensures restartability - LU-3581 */ + rc = -ERESTARTSYS; + break; + default: + CDEBUG(D_CACHE, "%s: event for cache space @" + " %p never arrived due to %d\n", + cli->cl_import->imp_obd->obd_name, + &ocw, rc); + break; + } + cfs_list_del_init(&ocw.ocw_entry); + GOTO(out, rc); + } + + LASSERT(cfs_list_empty(&ocw.ocw_entry)); rc = ocw.ocw_rc; + if (rc != -EDQUOT) - break; + GOTO(out, rc); + if (osc_enter_cache_try(cli, oap, bytes, 0)) + GOTO(out, rc = 0); } - + EXIT; +out: + client_obd_list_unlock(&cli->cl_loi_list_lock); + OSC_DUMP_GRANT(D_CACHE, cli, "returned %d.\n", rc); RETURN(rc); } @@ -364,39 +1605,29 @@ void osc_wake_cache_waiters(struct client_obd *cli) ENTRY; cfs_list_for_each_safe(l, tmp, &cli->cl_cache_waiters) { - /* if we can't dirty more, we must wait until some is written */ - if ((cli->cl_dirty + CFS_PAGE_SIZE > cli->cl_dirty_max) || - (cfs_atomic_read(&obd_dirty_pages) + 1 > - obd_max_dirty_pages)) { + ocw = cfs_list_entry(l, struct osc_cache_waiter, ocw_entry); + cfs_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) || + (cfs_atomic_read(&obd_unstable_pages) + 1 + + cfs_atomic_read(&obd_dirty_pages) > 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); - return; + goto wakeup; } - /* if still dirty cache but no grant wait for pending RPCs that - * may yet return us some grant before doing sync writes */ - if (cli->cl_w_in_flight && cli->cl_avail_grant < CFS_PAGE_SIZE) { - CDEBUG(D_CACHE, "%u BRW writes in flight, no grant\n", - cli->cl_w_in_flight); - return; - } - - ocw = cfs_list_entry(l, struct osc_cache_waiter, ocw_entry); - cfs_list_del_init(&ocw->ocw_entry); - if (cli->cl_avail_grant < CFS_PAGE_SIZE) { - /* no more RPCs in flight to return grant, do sync IO */ + ocw->ocw_rc = 0; + if (!osc_enter_cache_try(cli, ocw->ocw_oap, ocw->ocw_grant, 0)) ocw->ocw_rc = -EDQUOT; - CDEBUG(D_INODE, "wake oap %p for sync\n", ocw->ocw_oap); - } else { - osc_consume_write_grant(cli, - &ocw->ocw_oap->oap_brw_page); - } - CDEBUG(D_CACHE, "wake up %p for oap %p, avail grant %ld\n", - ocw, ocw->ocw_oap, cli->cl_avail_grant); +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); - cfs_waitq_signal(&ocw->ocw_waitq); + wake_up(&ocw->ocw_waitq); } EXIT; @@ -404,21 +1635,7 @@ void osc_wake_cache_waiters(struct client_obd *cli) static int osc_max_rpc_in_flight(struct client_obd *cli, struct osc_object *osc) { - struct osc_async_page *oap; - int hprpc = 0; - - if (!cfs_list_empty(&osc->oo_write_pages.oop_urgent)) { - oap = cfs_list_entry(osc->oo_write_pages.oop_urgent.next, - struct osc_async_page, oap_urgent_item); - hprpc = !!(oap->oap_async_flags & ASYNC_HP); - } - - if (!hprpc && !cfs_list_empty(&osc->oo_read_pages.oop_urgent)) { - oap = cfs_list_entry(osc->oo_read_pages.oop_urgent.next, - struct osc_async_page, oap_urgent_item); - hprpc = !!(oap->oap_async_flags & ASYNC_HP); - } - + int hprpc = !!cfs_list_empty(&osc->oo_hp_exts); return rpcs_in_flight(cli) >= cli->cl_max_rpcs_in_flight + hprpc; } @@ -428,35 +1645,31 @@ static int osc_max_rpc_in_flight(struct client_obd *cli, struct osc_object *osc) static int osc_makes_rpc(struct client_obd *cli, struct osc_object *osc, int cmd) { - struct osc_oap_pages *lop; + int invalid_import = 0; ENTRY; - if (cmd & OBD_BRW_WRITE) { - lop = &osc->oo_write_pages; - } else { - lop = &osc->oo_read_pages; - } - - if (lop->oop_num_pending == 0) - RETURN(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) - RETURN(1); - - /* stream rpcs in queue order as long as as there is an urgent page - * queued. this is our cheap solution for good batching in the case - * where writepage marks some random page in the middle of the file - * as urgent because of, say, memory pressure */ - if (!cfs_list_empty(&lop->oop_urgent)) { - CDEBUG(D_CACHE, "urgent request forcing RPC\n"); - RETURN(1); - } + if ((cli->cl_import == NULL || cli->cl_import->imp_invalid)) + invalid_import = 1; if (cmd & OBD_BRW_WRITE) { + if (cfs_atomic_read(&osc->oo_nr_writes) == 0) + RETURN(0); + if (invalid_import) { + CDEBUG(D_CACHE, "invalid import forcing RPC\n"); + RETURN(1); + } + if (!cfs_list_empty(&osc->oo_hp_exts)) { + CDEBUG(D_CACHE, "high prio request forcing RPC\n"); + RETURN(1); + } + if (!cfs_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.. */ @@ -464,40 +1677,42 @@ static int osc_makes_rpc(struct client_obd *cli, struct osc_object *osc, CDEBUG(D_CACHE, "cache waiters forcing RPC\n"); RETURN(1); } + if (cfs_atomic_read(&osc->oo_nr_writes) >= + cli->cl_max_pages_per_rpc) + RETURN(1); + } else { + if (cfs_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 (!cfs_list_empty(&osc->oo_reading_exts)) + RETURN(1); } - if (lop->oop_num_pending >= cli->cl_max_pages_per_rpc) - RETURN(1); RETURN(0); } -static void lop_update_pending(struct client_obd *cli, - struct osc_oap_pages *lop, int cmd, int delta) +static void osc_update_pending(struct osc_object *obj, int cmd, int delta) { - lop->oop_num_pending += delta; - if (cmd & OBD_BRW_WRITE) - cli->cl_pending_w_pages += delta; - else - cli->cl_pending_r_pages += delta; + struct client_obd *cli = osc_cli(obj); + if (cmd & OBD_BRW_WRITE) { + cfs_atomic_add(delta, &obj->oo_nr_writes); + cfs_atomic_add(delta, &cli->cl_pending_w_pages); + LASSERT(cfs_atomic_read(&obj->oo_nr_writes) >= 0); + } else { + cfs_atomic_add(delta, &obj->oo_nr_reads); + cfs_atomic_add(delta, &cli->cl_pending_r_pages); + LASSERT(cfs_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_oap_pages *lop) +static int osc_makes_hprpc(struct osc_object *obj) { - struct osc_async_page *oap; - ENTRY; - - if (cfs_list_empty(&lop->oop_urgent)) - RETURN(0); - - oap = cfs_list_entry(lop->oop_urgent.next, - struct osc_async_page, oap_urgent_item); - - if (oap->oap_async_flags & ASYNC_HP) { - CDEBUG(D_CACHE, "hp request forcing RPC\n"); - RETURN(1); - } - - RETURN(0); + return !cfs_list_empty(&obj->oo_hp_exts); } static void on_list(cfs_list_t *item, cfs_list_t *list, int should_be_on) @@ -510,10 +1725,9 @@ static void on_list(cfs_list_t *item, cfs_list_t *list, int should_be_on) /* maintain the osc's cli list membership invariants so that osc_send_oap_rpc * can find pages to build into rpcs quickly */ -static void osc_list_maint(struct client_obd *cli, struct osc_object *osc) +static int __osc_list_maint(struct client_obd *cli, struct osc_object *osc) { - if (osc_makes_hprpc(&osc->oo_write_pages) || - osc_makes_hprpc(&osc->oo_read_pages)) { + 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); @@ -525,10 +1739,23 @@ static void osc_list_maint(struct client_obd *cli, struct osc_object *osc) } on_list(&osc->oo_write_item, &cli->cl_loi_write_list, - osc->oo_write_pages.oop_num_pending); + cfs_atomic_read(&osc->oo_nr_writes) > 0); on_list(&osc->oo_read_item, &cli->cl_loi_read_list, - osc->oo_read_pages.oop_num_pending); + cfs_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 propogate async writeback errors back up to the @@ -553,29 +1780,95 @@ static void osc_process_ar(struct osc_async_rc *ar, __u64 xid, ar->ar_force_sync = 0; } -static void osc_oap_to_pending(struct osc_async_page *oap) +/* Performs "unstable" page accounting. This function balances the + * increment operations performed in osc_inc_unstable_pages. It is + * registered as the RPC request callback, and is executed when the + * bulk RPC is committed on the server. Thus at this point, the pages + * involved in the bulk transfer are no longer considered unstable. */ +void osc_dec_unstable_pages(struct ptlrpc_request *req) { - struct osc_object *osc = oap->oap_obj; - struct osc_oap_pages *lop; + struct ptlrpc_bulk_desc *desc = req->rq_bulk; + struct client_obd *cli = &req->rq_import->imp_obd->u.cli; + obd_count page_count = desc->bd_iov_count; + int i; - if (oap->oap_cmd & OBD_BRW_WRITE) - lop = &osc->oo_write_pages; - else - lop = &osc->oo_read_pages; + /* No unstable page tracking */ + if (cli->cl_cache == NULL) + return; + + LASSERT(page_count >= 0); + + for (i = 0; i < page_count; i++) + dec_zone_page_state(desc->bd_iov[i].kiov_page, NR_UNSTABLE_NFS); + + cfs_atomic_sub(page_count, &cli->cl_cache->ccc_unstable_nr); + LASSERT(cfs_atomic_read(&cli->cl_cache->ccc_unstable_nr) >= 0); + + cfs_atomic_sub(page_count, &cli->cl_unstable_count); + LASSERT(cfs_atomic_read(&cli->cl_unstable_count) >= 0); + + cfs_atomic_sub(page_count, &obd_unstable_pages); + LASSERT(cfs_atomic_read(&obd_unstable_pages) >= 0); + + spin_lock(&req->rq_lock); + req->rq_committed = 1; + req->rq_unstable = 0; + spin_unlock(&req->rq_lock); + + wake_up_all(&cli->cl_cache->ccc_unstable_waitq); +} + +/* "unstable" page accounting. See: osc_dec_unstable_pages. */ +void osc_inc_unstable_pages(struct ptlrpc_request *req) +{ + struct ptlrpc_bulk_desc *desc = req->rq_bulk; + struct client_obd *cli = &req->rq_import->imp_obd->u.cli; + obd_count page_count = desc->bd_iov_count; + int i; + + /* No unstable page tracking */ + if (cli->cl_cache == NULL) + return; + + LASSERT(page_count >= 0); + + for (i = 0; i < page_count; i++) + inc_zone_page_state(desc->bd_iov[i].kiov_page, NR_UNSTABLE_NFS); + + LASSERT(cfs_atomic_read(&cli->cl_cache->ccc_unstable_nr) >= 0); + cfs_atomic_add(page_count, &cli->cl_cache->ccc_unstable_nr); + + LASSERT(cfs_atomic_read(&cli->cl_unstable_count) >= 0); + cfs_atomic_add(page_count, &cli->cl_unstable_count); + + LASSERT(cfs_atomic_read(&obd_unstable_pages) >= 0); + cfs_atomic_add(page_count, &obd_unstable_pages); - if (oap->oap_async_flags & ASYNC_HP) - cfs_list_add(&oap->oap_urgent_item, &lop->oop_urgent); - else if (oap->oap_async_flags & ASYNC_URGENT) - cfs_list_add_tail(&oap->oap_urgent_item, &lop->oop_urgent); - cfs_list_add_tail(&oap->oap_pending_item, &lop->oop_pending); - lop_update_pending(oap->oap_cli, lop, oap->oap_cmd, 1); + spin_lock(&req->rq_lock); + + /* If the request has already been committed (i.e. brw_commit + * called via rq_commit_cb), we need to undo the unstable page + * increments we just performed because rq_commit_cb wont be + * called again. Otherwise, just set the commit callback so the + * unstable page accounting is properly updated when the request + * is committed */ + if (req->rq_committed) { + /* Drop lock before calling osc_dec_unstable_pages */ + spin_unlock(&req->rq_lock); + osc_dec_unstable_pages(req); + spin_lock(&req->rq_lock); + } else { + req->rq_unstable = 1; + req->rq_commit_cb = osc_dec_unstable_pages; + } + + spin_unlock(&req->rq_lock); } /* this must be called holding the loi list lock to give coverage to exit_cache, * async_flag maintenance, and oap_request */ -void osc_ap_completion(const struct lu_env *env, struct client_obd *cli, - struct obdo *oa, struct osc_async_page *oap, - int sent, int rc) +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; @@ -583,43 +1876,213 @@ void osc_ap_completion(const struct lu_env *env, struct client_obd *cli, ENTRY; if (oap->oap_request != NULL) { + if (rc == 0) + osc_inc_unstable_pages(oap->oap_request); + xid = ptlrpc_req_xid(oap->oap_request); ptlrpc_req_finished(oap->oap_request); oap->oap_request = NULL; } - cfs_spin_lock(&oap->oap_lock); - oap->oap_async_flags = 0; - cfs_spin_unlock(&oap->oap_lock); - oap->oap_interrupted = 0; + /* 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); + + EXIT; +} + +/** + * 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, cfs_list_t *rpclist, + int *pc, unsigned int *max_pages) +{ + struct osc_extent *tmp; + ENTRY; + + 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); + + cfs_list_for_each_entry(tmp, rpclist, oe_link) { + EASSERT(tmp->oe_owner == current, tmp); +#if 0 + if (overlapped(tmp, ext)) { + OSC_EXTENT_DUMP(D_ERROR, tmp, "overlapped %p.\n", ext); + EASSERT(0, ext); + } +#endif + + 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; + cfs_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, cfs_list_t *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 (!cfs_list_empty(&obj->oo_hp_exts)) { + ext = cfs_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 (!cfs_list_empty(&obj->oo_urgent_exts)) { + ext = cfs_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) || + (!cfs_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 */ + (!cfs_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) +{ + CFS_LIST_HEAD(rpclist); + struct osc_extent *ext; + struct osc_extent *tmp; + struct osc_extent *first = NULL; + obd_count page_count = 0; + int srvlock = 0; + int rc = 0; + ENTRY; + + LASSERT(osc_object_is_locked(osc)); + + page_count = get_write_extents(osc, &rpclist); + LASSERT(equi(page_count == 0, cfs_list_empty(&rpclist))); + + if (cfs_list_empty(&rpclist)) + RETURN(0); - if (oap->oap_cmd & OBD_BRW_WRITE) { - osc_process_ar(&cli->cl_ar, xid, rc); - osc_process_ar(&loi->loi_ar, xid, rc); + osc_update_pending(osc, OBD_BRW_WRITE, -page_count); + + cfs_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); } - if (rc == 0 && oa != NULL) { - if (oa->o_valid & OBD_MD_FLBLOCKS) - loi->loi_lvb.lvb_blocks = oa->o_blocks; - if (oa->o_valid & OBD_MD_FLMTIME) - loi->loi_lvb.lvb_mtime = oa->o_mtime; - if (oa->o_valid & OBD_MD_FLATIME) - loi->loi_lvb.lvb_atime = oa->o_atime; - if (oa->o_valid & OBD_MD_FLCTIME) - loi->loi_lvb.lvb_ctime = oa->o_ctime; + /* we're going to grab page lock, so release object lock because + * lock order is page lock -> object lock. */ + osc_object_unlock(osc); + + cfs_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)) { + cfs_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); + } } - rc = osc_completion(env, oap, oap->oap_cmd, oa, rc); + if (!cfs_list_empty(&rpclist)) { + LASSERT(page_count > 0); + rc = osc_build_rpc(env, cli, &rpclist, OBD_BRW_WRITE, pol); + LASSERT(cfs_list_empty(&rpclist)); + } - /* cl_page_completion() drops PG_locked. so, a new I/O on the page could - * start, but OSC calls it under lock and thus we can add oap back to - * pending safely */ - if (rc) - /* upper layer wants to leave the page on pending queue */ - osc_oap_to_pending(oap); - else - osc_exit_cache(cli, oap, sent); - EXIT; + osc_object_lock(osc); + RETURN(rc); } /** @@ -633,193 +2096,48 @@ void osc_ap_completion(const struct lu_env *env, struct client_obd *cli, * \return negative on errors. */ static int -osc_send_oap_rpc(const struct lu_env *env, struct client_obd *cli, - struct osc_object *osc, int cmd, - struct osc_oap_pages *lop, pdl_policy_t pol) +osc_send_read_rpc(const struct lu_env *env, struct client_obd *cli, + struct osc_object *osc, pdl_policy_t pol) { - obd_count page_count = 0; - struct osc_async_page *oap = NULL, *tmp; - CFS_LIST_HEAD(rpc_list); - int srvlock = 0, mem_tight = 0; - obd_off starting_offset = OBD_OBJECT_EOF; - unsigned int ending_offset; - int starting_page_off = 0; - int rc; + struct osc_extent *ext; + struct osc_extent *next; + CFS_LIST_HEAD(rpclist); + int page_count = 0; + unsigned int max_pages = cli->cl_max_pages_per_rpc; + int rc = 0; ENTRY; - /* ASYNC_HP pages first. At present, when the lock the pages is - * to be canceled, the pages covered by the lock will be sent out - * with ASYNC_HP. We have to send out them as soon as possible. */ - cfs_list_for_each_entry_safe(oap, tmp, &lop->oop_urgent, oap_urgent_item) { - if (oap->oap_async_flags & ASYNC_HP) - cfs_list_move(&oap->oap_pending_item, &rpc_list); - else if (!(oap->oap_brw_flags & OBD_BRW_SYNC)) - /* only do this for writeback pages. */ - cfs_list_move_tail(&oap->oap_pending_item, &rpc_list); - if (++page_count >= cli->cl_max_pages_per_rpc) - break; - } - cfs_list_splice_init(&rpc_list, &lop->oop_pending); - page_count = 0; - - /* first we find the pages we're allowed to work with */ - cfs_list_for_each_entry_safe(oap, tmp, &lop->oop_pending, - oap_pending_item) { - LASSERTF(oap->oap_magic == OAP_MAGIC, "Bad oap magic: oap %p, " - "magic 0x%x\n", oap, oap->oap_magic); - - if (page_count != 0 && - srvlock != !!(oap->oap_brw_flags & OBD_BRW_SRVLOCK)) { - CDEBUG(D_PAGE, "SRVLOCK flag mismatch," - " oap %p, page %p, srvlock %u\n", - oap, oap->oap_brw_page.pg, (unsigned)!srvlock); - break; - } - - /* If there is a gap at the start of this page, it can't merge - * with any previous page, so we'll hand the network a - * "fragmented" page array that it can't transfer in 1 RDMA */ - if (oap->oap_obj_off < starting_offset) { - if (starting_page_off != 0) - break; - - starting_page_off = oap->oap_page_off; - starting_offset = oap->oap_obj_off + starting_page_off; - } else if (oap->oap_page_off != 0) - break; - - /* in llite being 'ready' equates to the page being locked - * until completion unlocks it. commit_write submits a page - * as not ready because its unlock will happen unconditionally - * as the call returns. if we race with commit_write giving - * us that page we don't want to create a hole in the page - * stream, so we stop and leave the rpc to be fired by - * another dirtier or kupdated interval (the not ready page - * will still be on the dirty list). we could call in - * at the end of ll_file_write to process the queue again. */ - if (!(oap->oap_async_flags & ASYNC_READY)) { - int rc = osc_make_ready(env, oap, cmd); - if (rc < 0) - CDEBUG(D_INODE, "oap %p page %p returned %d " - "instead of ready\n", oap, - oap->oap_page, rc); - switch (rc) { - case -EAGAIN: - /* llite is telling us that the page is still - * in commit_write and that we should try - * and put it in an rpc again later. we - * break out of the loop so we don't create - * a hole in the sequence of pages in the rpc - * stream.*/ - oap = NULL; - break; - case -EINTR: - /* the io isn't needed.. tell the checks - * below to complete the rpc with EINTR */ - cfs_spin_lock(&oap->oap_lock); - oap->oap_async_flags |= ASYNC_COUNT_STABLE; - cfs_spin_unlock(&oap->oap_lock); - oap->oap_count = -EINTR; - break; - case 0: - cfs_spin_lock(&oap->oap_lock); - oap->oap_async_flags |= ASYNC_READY; - cfs_spin_unlock(&oap->oap_lock); - break; - default: - LASSERTF(0, "oap %p page %p returned %d " - "from make_ready\n", oap, - oap->oap_page, rc); - break; - } - } - if (oap == NULL) - break; - - /* take the page out of our book-keeping */ - cfs_list_del_init(&oap->oap_pending_item); - lop_update_pending(cli, lop, cmd, -1); - cfs_list_del_init(&oap->oap_urgent_item); - - /* ask the caller for the size of the io as the rpc leaves. */ - if (!(oap->oap_async_flags & ASYNC_COUNT_STABLE)) { - oap->oap_count = osc_refresh_count(env, oap, cmd); - LASSERT(oap->oap_page_off + oap->oap_count <= CFS_PAGE_SIZE); - } - if (oap->oap_count <= 0) { - CDEBUG(D_CACHE, "oap %p count %d, completing\n", oap, - oap->oap_count); - osc_ap_completion(env, cli, NULL, - oap, 0, oap->oap_count); - continue; - } - - /* now put the page back in our accounting */ - cfs_list_add_tail(&oap->oap_rpc_item, &rpc_list); - if (page_count++ == 0) - srvlock = !!(oap->oap_brw_flags & OBD_BRW_SRVLOCK); - - if (oap->oap_brw_flags & OBD_BRW_MEMALLOC) - mem_tight = 1; - - /* End on a PTLRPC_MAX_BRW_SIZE boundary. We want full-sized - * RPCs aligned on PTLRPC_MAX_BRW_SIZE boundaries to help reads - * have the same alignment as the initial writes that allocated - * extents on the server. */ - ending_offset = oap->oap_obj_off + oap->oap_page_off + - oap->oap_count; - if (!(ending_offset & (PTLRPC_MAX_BRW_SIZE - 1))) - break; - - if (page_count >= cli->cl_max_pages_per_rpc) - break; - - /* If there is a gap at the end of this page, it can't merge - * with any subsequent pages, so we'll hand the network a - * "fragmented" page array that it can't transfer in 1 RDMA */ - if (oap->oap_page_off + oap->oap_count < CFS_PAGE_SIZE) + LASSERT(osc_object_is_locked(osc)); + cfs_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_list_maint(cli, osc); - - client_obd_list_unlock(&cli->cl_loi_list_lock); + osc_update_pending(osc, OBD_BRW_READ, -page_count); - if (page_count == 0) { - client_obd_list_lock(&cli->cl_loi_list_lock); - RETURN(0); - } + if (!cfs_list_empty(&rpclist)) { + osc_object_unlock(osc); - if (mem_tight) - cmd |= OBD_BRW_MEMALLOC; - rc = osc_build_rpc(env, cli, &rpc_list, page_count, cmd, pol); - if (rc != 0) { - LASSERT(cfs_list_empty(&rpc_list)); - osc_list_maint(cli, osc); - RETURN(rc); - } + LASSERT(page_count > 0); + rc = osc_build_rpc(env, cli, &rpclist, OBD_BRW_READ, pol); + LASSERT(cfs_list_empty(&rpclist)); - starting_offset &= PTLRPC_MAX_BRW_SIZE - 1; - if (cmd == OBD_BRW_READ) { - cli->cl_r_in_flight++; - lprocfs_oh_tally_log2(&cli->cl_read_page_hist, page_count); - lprocfs_oh_tally(&cli->cl_read_rpc_hist, cli->cl_r_in_flight); - lprocfs_oh_tally_log2(&cli->cl_read_offset_hist, - (starting_offset >> CFS_PAGE_SHIFT) + 1); - } else { - cli->cl_w_in_flight++; - lprocfs_oh_tally_log2(&cli->cl_write_page_hist, page_count); - lprocfs_oh_tally(&cli->cl_write_rpc_hist, - cli->cl_w_in_flight); - lprocfs_oh_tally_log2(&cli->cl_write_offset_hist, - (starting_offset >> CFS_PAGE_SHIFT) + 1); + osc_object_lock(osc); } - - RETURN(1); + RETURN(rc); } -#define list_to_obj(list, item) \ - cfs_list_entry((list)->next, struct osc_object, oo_##item) +#define list_to_obj(list, item) ({ \ + cfs_list_t *__tmp = (list)->next; \ + cfs_list_del_init(__tmp); \ + cfs_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(). */ @@ -861,14 +2179,24 @@ 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, race_counter = 0; + int rc = 0; ENTRY; 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)) + 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 @@ -876,13 +2204,13 @@ static void osc_check_rpcs(const struct lu_env *env, struct client_obd *cli, * 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_oap_rpc(env, cli, osc, OBD_BRW_WRITE, - &osc->oo_write_pages, pol); + rc = osc_send_write_rpc(env, cli, osc, pol); if (rc < 0) { CERROR("Write request failed with %d\n", rc); - /* osc_send_oap_rpc failed, mostly because of + /* osc_send_write_rpc failed, mostly because of * memory pressure. * * It can't break here, because if: @@ -900,57 +2228,62 @@ static void osc_check_rpcs(const struct lu_env *env, struct client_obd *cli, * Anyway, continue to drain pages. */ /* break; */ } - - if (rc > 0) - race_counter = 0; - else if (rc == 0) - race_counter++; } if (osc_makes_rpc(cli, osc, OBD_BRW_READ)) { - rc = osc_send_oap_rpc(env, cli, osc, OBD_BRW_READ, - &osc->oo_read_pages, pol); + rc = osc_send_read_rpc(env, cli, osc, pol); if (rc < 0) CERROR("Read request failed with %d\n", rc); - - if (rc > 0) - race_counter = 0; - else if (rc == 0) - race_counter++; } - - /* attempt some inter-object balancing by issuing rpcs - * for each object in turn */ - if (!cfs_list_empty(&osc->oo_hp_ready_item)) - cfs_list_del_init(&osc->oo_hp_ready_item); - if (!cfs_list_empty(&osc->oo_ready_item)) - cfs_list_del_init(&osc->oo_ready_item); - if (!cfs_list_empty(&osc->oo_write_item)) - cfs_list_del_init(&osc->oo_write_item); - if (!cfs_list_empty(&osc->oo_read_item)) - cfs_list_del_init(&osc->oo_read_item); + 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); - /* send_oap_rpc fails with 0 when make_ready tells it to - * back off. llite's make_ready does this when it tries - * to lock a page queued for write that is already locked. - * we want to try sending rpcs from many objects, but we - * don't want to spin failing with 0. */ - if (race_counter == 10) - break; + 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 */ + cfs_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); + cfs_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) { - if (osc) - osc_list_maint(cli, osc); - osc_check_rpcs(env, cli, pol); + (void)osc_io_unplug0(env, cli, osc, pol, 0); } int osc_prep_async_page(struct osc_object *osc, struct osc_page *ops, - cfs_page_t *page, loff_t offset) + struct page *page, loff_t offset) { struct obd_export *exp = osc_export(osc); struct osc_async_page *oap = &ops->ops_oap; @@ -971,24 +2304,28 @@ int osc_prep_async_page(struct osc_object *osc, struct osc_page *ops, oap->oap_brw_flags = OBD_BRW_NOQUOTA; CFS_INIT_LIST_HEAD(&oap->oap_pending_item); - CFS_INIT_LIST_HEAD(&oap->oap_urgent_item); CFS_INIT_LIST_HEAD(&oap->oap_rpc_item); - cfs_spin_lock_init(&oap->oap_lock); - CDEBUG(D_CACHE, "oap %p page %p obj off "LPU64"\n", + spin_lock_init(&oap->oap_lock); + CDEBUG(D_INFO, "oap %p page %p obj off "LPU64"\n", oap, page, oap->oap_obj_off); RETURN(0); } -int osc_queue_async_io(const struct lu_env *env, struct osc_page *ops) +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; - struct obd_export *exp = osc_export(osc); - int brw_flags = OBD_BRW_ASYNC; - int cmd = OBD_BRW_WRITE; - int rc = 0; + pgoff_t index; + int grants = 0; + int brw_flags = OBD_BRW_ASYNC; + int cmd = OBD_BRW_WRITE; + int need_release = 0; + int rc = 0; ENTRY; if (oap->oap_magic != OAP_MAGIC) @@ -998,13 +2335,13 @@ int osc_queue_async_io(const struct lu_env *env, struct osc_page *ops) RETURN(-EIO); if (!cfs_list_empty(&oap->oap_pending_item) || - !cfs_list_empty(&oap->oap_urgent_item) || !cfs_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(exp) && cfs_capable(CFS_CAP_SYS_RESOURCE)) { + if (!client_is_remote(osc_export(osc)) && + cfs_capable(CFS_CAP_SYS_RESOURCE)) { brw_flags |= OBD_BRW_NOQUOTA; cmd |= OBD_BRW_NOQUOTA; } @@ -1024,213 +2361,683 @@ int osc_queue_async_io(const struct lu_env *env, struct osc_page *ops) qid[USRQUOTA] = attr->cat_uid; qid[GRPQUOTA] = attr->cat_gid; - if (rc == 0 && - osc_quota_chkdq(cli, qid) == NO_QUOTA) + if (rc == 0 && osc_quota_chkdq(cli, qid) == NO_QUOTA) rc = -EDQUOT; if (rc) RETURN(rc); } - client_obd_list_lock(&cli->cl_loi_list_lock); + if (osc_over_unstable_soft_limit(cli)) + brw_flags |= OBD_BRW_SOFT_SYNC; oap->oap_cmd = cmd; oap->oap_page_off = ops->ops_from; oap->oap_count = ops->ops_to - ops->ops_from; + /* No need to hold a lock here, + * since this page is not in any list yet. */ oap->oap_async_flags = 0; oap->oap_brw_flags = brw_flags; - /* Give a hint to OST that requests are coming from kswapd - bug19529 */ - if (cfs_memory_pressure_get()) - oap->oap_brw_flags |= OBD_BRW_MEMALLOC; - rc = osc_enter_cache(env, cli, oap); - if (rc) { + 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 accomodate 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); - RETURN(rc); + 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; } - OSC_IO_DEBUG(osc, "oap %p page %p added for cmd %d\n", - oap, oap->oap_page, cmd); + 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; + } - osc_oap_to_pending(oap); - osc_list_maint(cli, osc); - if (!osc_max_rpc_in_flight(cli, osc) && - osc_makes_rpc(cli, osc, OBD_BRW_WRITE)) { - LASSERT(cli->cl_writeback_work != NULL); - rc = ptlrpcd_queue_work(cli->cl_writeback_work); + 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); - CDEBUG(D_CACHE, "Queued writeback work for client obd %p/%d.\n", - cli, rc); + 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; + cfs_list_add_tail(&oap->oap_pending_item, &ext->oe_pages); + osc_object_unlock(osc); } - client_obd_list_unlock(&cli->cl_loi_list_lock); + RETURN(rc); +} - RETURN(0); +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; + ENTRY; + + 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 (!cfs_list_empty(&oap->oap_rpc_item)) { + CDEBUG(D_CACHE, "oap %p is not in cache.\n", oap); + rc = -EBUSY; + } else if (!cfs_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); } -int osc_teardown_async_page(struct osc_object *obj, struct osc_page *ops) +/** + * 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; - struct client_obd *cli = oap->oap_cli; - struct osc_oap_pages *lop; + bool unplug = false; int rc = 0; ENTRY; - if (oap->oap_magic != OAP_MAGIC) - RETURN(-EINVAL); + 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); + } - if (oap->oap_cmd & OBD_BRW_WRITE) { - lop = &obj->oo_write_pages; - } else { - lop = &obj->oo_read_pages; + 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 */ + GOTO(out, rc = -EAGAIN); + default: + break; } - client_obd_list_lock(&cli->cl_loi_list_lock); + rc = cl_page_prep(env, io, cl_page_top(cp), CRT_WRITE); + if (rc) + GOTO(out, rc); + + 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 (cfs_list_empty(&ext->oe_link)) + cfs_list_add_tail(&ext->oe_link, &obj->oo_urgent_exts); + unplug = true; + } + rc = 0; + EXIT; + +out: + osc_object_unlock(obj); + osc_extent_put(env, ext); + if (unplug) + osc_io_unplug_async(env, osc_cli(obj), obj); + return rc; +} - if (!cfs_list_empty(&oap->oap_rpc_item)) - GOTO(out, rc = -EBUSY); +/** + * 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; + cfs_list_t *plist; + pgoff_t index = oap2cl_page(oap)->cp_index; + int rc = -EBUSY; + int cmd; + ENTRY; - osc_exit_cache(cli, oap, 0); - osc_wake_cache_waiters(cli); + LASSERT(!oap->oap_interrupted); + oap->oap_interrupted = 1; - if (!cfs_list_empty(&oap->oap_urgent_item)) { - cfs_list_del_init(&oap->oap_urgent_item); - cfs_spin_lock(&oap->oap_lock); - oap->oap_async_flags &= ~(ASYNC_URGENT | ASYNC_HP); - cfs_spin_unlock(&oap->oap_lock); + /* 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; } - if (!cfs_list_empty(&oap->oap_pending_item)) { - cfs_list_del_init(&oap->oap_pending_item); - lop_update_pending(cli, lop, oap->oap_cmd, -1); + cfs_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) { + cfs_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); - OSC_IO_DEBUG(obj, "oap %p page %p torn down\n", oap, oap->oap_page); -out: - client_obd_list_unlock(&cli->cl_loi_list_lock); RETURN(rc); } -/* aka (~was & now & flag), but this is more clear :) */ -#define SETTING(was, now, flag) (!(was & flag) && (now & flag)) - -int osc_set_async_flags(struct osc_object *obj, struct osc_page *opg, - obd_flag async_flags) +int osc_queue_sync_pages(const struct lu_env *env, struct osc_object *obj, + cfs_list_t *list, int cmd, int brw_flags) { - struct osc_async_page *oap = &opg->ops_oap; - struct osc_oap_pages *lop; - int flags = 0; + struct client_obd *cli = osc_cli(obj); + struct osc_extent *ext; + struct osc_async_page *oap; + int page_count = 0; + int mppr = cli->cl_max_pages_per_rpc; + pgoff_t start = CL_PAGE_EOF; + pgoff_t end = 0; ENTRY; - LASSERT(!cfs_list_empty(&oap->oap_pending_item)); + cfs_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); + } - if (oap->oap_cmd & OBD_BRW_WRITE) { - lop = &obj->oo_write_pages; + ext = osc_extent_alloc(obj); + if (ext == NULL) { + cfs_list_for_each_entry(oap, list, oap_pending_item) { + cfs_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; + cfs_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) { + cfs_list_add_tail(&ext->oe_link, &obj->oo_urgent_exts); + osc_update_pending(obj, OBD_BRW_WRITE, page_count); } else { - lop = &obj->oo_read_pages; + cfs_list_add_tail(&ext->oe_link, &obj->oo_reading_exts); + osc_update_pending(obj, OBD_BRW_READ, page_count); } + osc_object_unlock(obj); - if ((oap->oap_async_flags & async_flags) == async_flags) - RETURN(0); + osc_io_unplug(env, cli, obj, PDL_POLICY_ROUND); + 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; + CFS_LIST_HEAD(list); + int result = 0; + bool partial; + ENTRY; + + /* 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; + } - if (SETTING(oap->oap_async_flags, async_flags, ASYNC_READY)) - flags |= ASYNC_READY; + OSC_EXTENT_DUMP(D_CACHE, ext, "try to trunc:"LPU64".\n", size); - if (SETTING(oap->oap_async_flags, async_flags, ASYNC_URGENT) && - cfs_list_empty(&oap->oap_rpc_item)) { - if (oap->oap_async_flags & ASYNC_HP) - cfs_list_add(&oap->oap_urgent_item, &lop->oop_urgent); - else - cfs_list_add_tail(&oap->oap_urgent_item, - &lop->oop_urgent); - flags |= ASYNC_URGENT; - osc_list_maint(oap->oap_cli, obj); + 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(cfs_list_empty(&ext->oe_link), ext); + cfs_list_add_tail(&ext->oe_link, &list); + + ext = next_extent(ext); } - cfs_spin_lock(&oap->oap_lock); - oap->oap_async_flags |= flags; - cfs_spin_unlock(&oap->oap_lock); + osc_object_unlock(obj); - OSC_IO_DEBUG(obj, "oap %p page %p has flags %x\n", oap, - oap->oap_page, oap->oap_async_flags); - RETURN(0); + osc_list_maint(cli, obj); + + while (!cfs_list_empty(&list)) { + int rc; + + ext = cfs_list_entry(list.next, struct osc_extent, oe_link); + cfs_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 "LPU64"\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); } /** - * 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. + * Called after osc_io_setattr_end to add oio->oi_trunc back to cache. */ -int osc_cancel_async_page(const struct lu_env *env, struct osc_page *ops) +void osc_cache_truncate_end(const struct lu_env *env, struct osc_io *oio, + struct osc_object *obj) { - struct osc_async_page *oap = &ops->ops_oap; - int rc = -EBUSY; + 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; + cfs_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; ENTRY; - LASSERT(!oap->oap_interrupted); - oap->oap_interrupted = 1; +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; - /* 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; - } + if (!ext->oe_fsync_wait) { + ext = next_extent(ext); + continue; + } - /* - * page completion may be called only if ->cpo_prep() method was - * executed by osc_io_submit(), that also adds page the to pending list - */ - if (!cfs_list_empty(&oap->oap_pending_item)) { - struct osc_oap_pages *lop; - struct osc_object *osc = oap->oap_obj; + 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); - cfs_list_del_init(&oap->oap_pending_item); - cfs_list_del_init(&oap->oap_urgent_item); + index = ext->oe_end + 1; + osc_extent_get(ext); + osc_object_unlock(obj); - lop = (oap->oap_cmd & OBD_BRW_WRITE) ? - &osc->oo_write_pages : &osc->oo_read_pages; - lop_update_pending(oap->oap_cli, lop, oap->oap_cmd, -1); - osc_list_maint(oap->oap_cli, osc); - rc = osc_completion(env, oap, oap->oap_cmd, NULL, -EINTR); + rc = osc_extent_wait(env, ext, OES_INV); + if (result == 0) + result = rc; + osc_extent_put(env, ext); + goto again; } + osc_object_unlock(obj); - RETURN(rc); + OSC_IO_DEBUG(obj, "sync file range.\n"); + RETURN(result); } -int osc_queue_sync_page(const struct lu_env *env, struct osc_page *opg, - int cmd, int brw_flags) +/** + * 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_async_page *oap = &opg->ops_oap; - struct client_obd *cli = oap->oap_cli; - int flags = 0; + struct osc_extent *ext; + CFS_LIST_HEAD(discard_list); + bool unplug = false; + int result = 0; ENTRY; - oap->oap_cmd = cmd; - oap->oap_page_off = opg->ops_from; - oap->oap_count = opg->ops_to - opg->ops_from; - oap->oap_brw_flags = OBD_BRW_SYNC | brw_flags; + 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; - /* Give a hint to OST that requests are coming from kswapd - bug19529 */ - if (cfs_memory_pressure_get()) - oap->oap_brw_flags |= OBD_BRW_MEMALLOC; + ext->oe_fsync_wait = 1; + switch (ext->oe_state) { + case OES_CACHE: + result += ext->oe_nr_pages; + if (!discard) { + cfs_list_t *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) + cfs_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; + cfs_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, cfs_list_empty(&discard_list))); + if (!cfs_list_empty(&discard_list)) { + struct osc_extent *tmp; + int rc; + + osc_list_maint(osc_cli(obj), obj); + cfs_list_for_each_entry_safe(ext, tmp, &discard_list, oe_link) { + cfs_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; + } - if (!client_is_remote(osc_export(cl2osc(opg->ops_cl.cpl_obj))) && - cfs_capable(CFS_CAP_SYS_RESOURCE)) { - oap->oap_brw_flags |= OBD_BRW_NOQUOTA; - oap->oap_cmd |= OBD_BRW_NOQUOTA; + /* finish the extent as if the pages were sent */ + osc_extent_finish(env, ext, 0, 0); + } } - if (oap->oap_cmd & OBD_BRW_READ) - flags = ASYNC_COUNT_STABLE; - else if (!(oap->oap_brw_page.flag & OBD_BRW_FROM_GRANT)) - osc_enter_cache_try(env, cli, oap, 1); + if (unplug) + osc_io_unplug(env, osc_cli(obj), obj, PDL_POLICY_ROUND); - cfs_spin_lock(&oap->oap_lock); - oap->oap_async_flags |= OSC_FLAGS | flags; - cfs_spin_unlock(&oap->oap_lock); + if (hp || discard) { + int rc; + rc = osc_cache_wait_range(env, obj, start, end); + if (result >= 0 && rc < 0) + result = rc; + } - osc_oap_to_pending(oap); - RETURN(0); + OSC_IO_DEBUG(obj, "pageout [%lu, %lu], %d.\n", start, end, result); + RETURN(result); } /** @} osc */