-/* -*- 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.
* 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, 2014, Intel Corporation.
*
*/
/*
#include "osc_cl_internal.h"
#include "osc_internal.h"
-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 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,
+ enum osc_extent_state 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
* @{
*/
-#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)
+/* ------------------ 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_sync)
+ *buf++ = 'S';
+ if (ext->oe_srvlock)
+ *buf++ = 's';
+ if (ext->oe_hp)
+ *buf++ = 'h';
+ if (ext->oe_urgent)
+ *buf++ = 'u';
+ if (ext->oe_memalloc)
+ *buf++ = 'm';
+ if (ext->oe_trunc_pending)
+ *buf++ = 't';
+ if (ext->oe_fsync_wait)
+ *buf++ = 'Y';
+ *buf = 0;
+ return flags;
+}
+
+static inline char list_empty_marker(struct list_head *list)
+{
+ return list_empty(list) ? '-' : '+';
+}
+
+#define EXTSTR "[%lu -> %lu/%lu]"
+#define EXTPARA(ext) (ext)->oe_start, (ext)->oe_end, (ext)->oe_max_end
+static const char *oes_strings[] = {
+ "inv", "active", "cache", "locking", "lockdone", "rpc", "trunc", NULL };
+
+#define OSC_EXTENT_DUMP(lvl, extent, fmt, ...) do { \
+ struct osc_extent *__ext = (extent); \
+ char __buf[16]; \
+ \
+ CDEBUG(lvl, \
+ "extent %p@{" EXTSTR ", " \
+ "[%d|%d|%c|%s|%s|%p], [%d|%d|%c|%c|%p|%u|%p]} " fmt, \
+ /* ----- extent part 0 ----- */ \
+ __ext, EXTPARA(__ext), \
+ /* ----- part 1 ----- */ \
+ atomic_read(&__ext->oe_refc), \
+ atomic_read(&__ext->oe_users), \
+ list_empty_marker(&__ext->oe_link), \
+ oes_strings[__ext->oe_state], ext_flags(__ext, __buf), \
+ __ext->oe_obj, \
+ /* ----- part 2 ----- */ \
+ __ext->oe_grants, __ext->oe_nr_pages, \
+ list_empty_marker(&__ext->oe_pages), \
+ waitqueue_active(&__ext->oe_waitq) ? '+' : '-', \
+ __ext->oe_dlmlock, __ext->oe_mppr, __ext->oe_owner, \
+ /* ----- part 4 ----- */ \
+ ## __VA_ARGS__); \
+ if (lvl == D_ERROR && __ext->oe_dlmlock != NULL) \
+ LDLM_ERROR(__ext->oe_dlmlock, "extent: %p\n", __ext); \
+ else \
+ LDLM_DEBUG(__ext->oe_dlmlock, "extent: %p\n", __ext); \
+} 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;
+ size_t 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 (atomic_read(&ext->oe_refc) <= 0)
+ GOTO(out, rc = 20);
+
+ if (atomic_read(&ext->oe_refc) < atomic_read(&ext->oe_users))
+ GOTO(out, rc = 30);
+
+ switch (ext->oe_state) {
+ case OES_INV:
+ if (ext->oe_nr_pages > 0 || !list_empty(&ext->oe_pages))
+ GOTO(out, rc = 35);
+ GOTO(out, rc = 0);
+ break;
+ case OES_ACTIVE:
+ if (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 (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_sync && ext->oe_grants > 0)
+ GOTO(out, rc = 90);
+
+ if (ext->oe_dlmlock != NULL && !ldlm_is_failed(ext->oe_dlmlock)) {
+ struct ldlm_extent *extent;
+
+ extent = &ext->oe_dlmlock->l_policy_data.l_extent;
+ if (!(extent->start <= cl_offset(osc2cl(obj), ext->oe_start) &&
+ extent->end >= cl_offset(osc2cl(obj), ext->oe_max_end)))
+ GOTO(out, rc = 100);
+
+ if (!(ext->oe_dlmlock->l_granted_mode & (LCK_PW | LCK_GROUP)))
+ GOTO(out, rc = 102);
+ }
+
+ 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;
+ list_for_each_entry(oap, &ext->oe_pages, oap_pending_item) {
+ pgoff_t index = osc_index(oap2osc(oap));
+ ++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;
+ atomic_set(&ext->oe_refc, 1);
+ atomic_set(&ext->oe_users, 0);
+ INIT_LIST_HEAD(&ext->oe_link);
+ ext->oe_state = OES_INV;
+ INIT_LIST_HEAD(&ext->oe_pages);
+ init_waitqueue_head(&ext->oe_waitq);
+ ext->oe_dlmlock = NULL;
+
+ return ext;
+}
+
+static void osc_extent_free(struct osc_extent *ext)
+{
+ OBD_SLAB_FREE_PTR(ext, osc_extent_kmem);
+}
+
+static struct osc_extent *osc_extent_get(struct osc_extent *ext)
+{
+ LASSERT(atomic_read(&ext->oe_refc) >= 0);
+ atomic_inc(&ext->oe_refc);
+ return ext;
+}
+
+static void osc_extent_put(const struct lu_env *env, struct osc_extent *ext)
+{
+ LASSERT(atomic_read(&ext->oe_refc) > 0);
+ if (atomic_dec_and_test(&ext->oe_refc)) {
+ LASSERT(list_empty(&ext->oe_link));
+ LASSERT(atomic_read(&ext->oe_users) == 0);
+ LASSERT(ext->oe_state == OES_INV);
+ LASSERT(!ext->oe_intree);
+
+ if (ext->oe_dlmlock != NULL) {
+ lu_ref_add(&ext->oe_dlmlock->l_reference,
+ "osc_extent", ext);
+ LDLM_LOCK_PUT(ext->oe_dlmlock);
+ ext->oe_dlmlock = NULL;
+ }
+ osc_extent_free(ext);
+ }
+}
+
+/**
+ * osc_extent_put_trust() is a special version of osc_extent_put() when
+ * it's known that the caller is not the last user. This is to address the
+ * problem of lacking of lu_env ;-).
+ */
+static void osc_extent_put_trust(struct osc_extent *ext)
+{
+ LASSERT(atomic_read(&ext->oe_refc) > 1);
+ LASSERT(osc_object_is_locked(ext->oe_obj));
+ atomic_dec(&ext->oe_refc);
+}
+
+/**
+ * Return the extent which includes pgoff @index, or return the greatest
+ * previous extent in the tree.
+ */
+static struct osc_extent *osc_extent_search(struct osc_object *obj,
+ pgoff_t index)
+{
+ struct rb_node *n = obj->oo_root.rb_node;
+ struct osc_extent *tmp, *p = NULL;
+
+ LASSERT(osc_object_is_locked(obj));
+ while (n != NULL) {
+ tmp = rb_extent(n);
+ if (index < tmp->oe_start) {
+ n = n->rb_left;
+ } else if (index > tmp->oe_end) {
+ p = rb_extent(n);
+ n = n->rb_right;
+ } else {
+ return tmp;
+ }
+ }
+ return p;
+}
+
+/*
+ * Return the extent covering @index, otherwise return NULL.
+ * caller must have held object lock.
+ */
+static struct osc_extent *osc_extent_lookup(struct osc_object *obj,
+ pgoff_t index)
+{
+ struct osc_extent *ext;
+
+ ext = osc_extent_search(obj, index);
+ if (ext != NULL && ext->oe_start <= index && index <= ext->oe_end)
+ return osc_extent_get(ext);
+ return NULL;
+}
+
+/* caller must have held object lock. */
+static void osc_extent_insert(struct osc_object *obj, struct osc_extent *ext)
+{
+ struct rb_node **n = &obj->oo_root.rb_node;
+ struct rb_node *parent = NULL;
+ struct osc_extent *tmp;
+
+ LASSERT(ext->oe_intree == 0);
+ LASSERT(ext->oe_obj == obj);
+ LASSERT(osc_object_is_locked(obj));
+ while (*n != NULL) {
+ tmp = rb_extent(*n);
+ parent = *n;
+
+ if (ext->oe_end < tmp->oe_start)
+ n = &(*n)->rb_left;
+ else if (ext->oe_start > tmp->oe_end)
+ n = &(*n)->rb_right;
+ else
+ EASSERTF(0, tmp, EXTSTR"\n", EXTPARA(ext));
+ }
+ rb_link_node(&ext->oe_node, parent, n);
+ rb_insert_color(&ext->oe_node, &obj->oo_root);
+ osc_extent_get(ext);
+ ext->oe_intree = 1;
+}
+
+/* caller must have held object lock. */
+static void osc_extent_erase(struct osc_extent *ext)
+{
+ struct osc_object *obj = ext->oe_obj;
+ LASSERT(osc_object_is_locked(obj));
+ if (ext->oe_intree) {
+ rb_erase(&ext->oe_node, &obj->oo_root);
+ ext->oe_intree = 0;
+ /* rbtree held a refcount */
+ osc_extent_put_trust(ext);
+ }
+}
+
+static struct osc_extent *osc_extent_hold(struct osc_extent *ext)
+{
+ struct osc_object *obj = ext->oe_obj;
+
+ LASSERT(osc_object_is_locked(obj));
+ LASSERT(ext->oe_state == OES_ACTIVE || ext->oe_state == OES_CACHE);
+ if (ext->oe_state == OES_CACHE) {
+ osc_extent_state_set(ext, OES_ACTIVE);
+ osc_update_pending(obj, OBD_BRW_WRITE, -ext->oe_nr_pages);
+ }
+ atomic_inc(&ext->oe_users);
+ list_del_init(&ext->oe_link);
+ return osc_extent_get(ext);
+}
+
+static void __osc_extent_remove(struct osc_extent *ext)
+{
+ LASSERT(osc_object_is_locked(ext->oe_obj));
+ LASSERT(list_empty(&ext->oe_pages));
+ osc_extent_erase(ext);
+ list_del_init(&ext->oe_link);
+ osc_extent_state_set(ext, OES_INV);
+ OSC_EXTENT_DUMP(D_CACHE, ext, "destroyed.\n");
+}
+
+static void osc_extent_remove(struct osc_extent *ext)
+{
+ struct osc_object *obj = ext->oe_obj;
+
+ osc_object_lock(obj);
+ __osc_extent_remove(ext);
+ osc_object_unlock(obj);
+}
+
+/**
+ * This function is used to merge extents to get better performance. It checks
+ * if @cur and @victim are contiguous at chunk level.
+ */
+static int osc_extent_merge(const struct lu_env *env, struct osc_extent *cur,
+ struct osc_extent *victim)
+{
+ struct osc_object *obj = cur->oe_obj;
+ pgoff_t chunk_start;
+ pgoff_t chunk_end;
+ int ppc_bits;
+
+ LASSERT(cur->oe_state == OES_CACHE);
+ LASSERT(osc_object_is_locked(obj));
+ if (victim == NULL)
+ return -EINVAL;
+
+ if (victim->oe_state != OES_CACHE || victim->oe_fsync_wait)
+ return -EBUSY;
+
+ if (cur->oe_max_end != victim->oe_max_end)
+ return -ERANGE;
+
+ LASSERT(cur->oe_dlmlock == victim->oe_dlmlock);
+ ppc_bits = osc_cli(obj)->cl_chunkbits - PAGE_CACHE_SHIFT;
+ chunk_start = cur->oe_start >> ppc_bits;
+ chunk_end = cur->oe_end >> ppc_bits;
+ if (chunk_start != (victim->oe_end >> ppc_bits) + 1 &&
+ chunk_end + 1 != victim->oe_start >> ppc_bits)
+ return -ERANGE;
+
+ OSC_EXTENT_DUMP(D_CACHE, victim, "will be merged by %p.\n", cur);
+
+ cur->oe_start = min(cur->oe_start, victim->oe_start);
+ cur->oe_end = max(cur->oe_end, victim->oe_end);
+ cur->oe_grants += victim->oe_grants;
+ cur->oe_nr_pages += victim->oe_nr_pages;
+ /* only the following bits are needed to merge */
+ cur->oe_urgent |= victim->oe_urgent;
+ cur->oe_memalloc |= victim->oe_memalloc;
+ list_splice_init(&victim->oe_pages, &cur->oe_pages);
+ list_del_init(&victim->oe_link);
+ victim->oe_nr_pages = 0;
+
+ osc_extent_get(victim);
+ __osc_extent_remove(victim);
+ osc_extent_put(env, victim);
+
+ OSC_EXTENT_DUMP(D_CACHE, cur, "after merging %p.\n", victim);
+ return 0;
+}
+
+/**
+ * Drop user count of osc_extent, and unplug IO asynchronously.
+ */
+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(atomic_read(&ext->oe_users) > 0);
+ LASSERT(sanity_check(ext) == 0);
+ LASSERT(ext->oe_grants > 0);
+
+ if (atomic_dec_and_lock(&ext->oe_users, &obj->oo_lock)) {
+ LASSERT(ext->oe_state == OES_ACTIVE);
+ if (ext->oe_trunc_pending) {
+ /* a truncate process is waiting for this extent.
+ * This may happen due to a race, check
+ * osc_cache_truncate_start(). */
+ osc_extent_state_set(ext, OES_TRUNC);
+ ext->oe_trunc_pending = 0;
+ } else {
+ osc_extent_state_set(ext, OES_CACHE);
+ osc_update_pending(obj, OBD_BRW_WRITE,
+ ext->oe_nr_pages);
+
+ /* try to merge the previous and next extent. */
+ osc_extent_merge(env, ext, prev_extent(ext));
+ osc_extent_merge(env, ext, next_extent(ext));
+
+ if (ext->oe_urgent)
+ list_move_tail(&ext->oe_link,
+ &obj->oo_urgent_exts);
+ }
+ osc_object_unlock(obj);
+
+ osc_io_unplug_async(env, osc_cli(obj), obj);
+ }
+ osc_extent_put(env, ext);
+ 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.
+ */
+static struct osc_extent *osc_extent_find(const struct lu_env *env,
+ struct osc_object *obj, pgoff_t index,
+ unsigned int *grants)
+{
+ struct client_obd *cli = osc_cli(obj);
+ struct osc_lock *olck;
+ struct cl_lock_descr *descr;
+ 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;
+ unsigned int max_pages; /* max_pages_per_rpc */
+ unsigned int chunksize;
+ int ppc_bits; /* pages per chunk bits */
+ pgoff_t chunk_mask;
+ int rc;
+ ENTRY;
+
+ cur = osc_extent_alloc(obj);
+ if (cur == NULL)
+ RETURN(ERR_PTR(-ENOMEM));
+
+ olck = osc_env_io(env)->oi_write_osclock;
+ LASSERTF(olck != NULL, "page %lu is not covered by lock\n", index);
+ LASSERT(olck->ols_state == OLS_GRANTED);
+
+ descr = &olck->ols_cl.cls_lock->cll_descr;
+ LASSERT(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, 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 < descr->cld_start)
+ cur->oe_start = descr->cld_start;
+ if (cur->oe_end > max_end)
+ cur->oe_end = max_end;
+ cur->oe_grants = 0;
+ cur->oe_mppr = max_pages;
+ if (olck->ols_dlmlock != NULL) {
+ LASSERT(olck->ols_hold);
+ cur->oe_dlmlock = LDLM_LOCK_GET(olck->ols_dlmlock);
+ lu_ref_add(&olck->ols_dlmlock->l_reference, "osc_extent", cur);
+ }
+
+ /* 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"\n",
+ 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) {
+ pgoff_t ext_chk_start = ext->oe_start >> ppc_bits;
+ pgoff_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 (olck->ols_dlmlock != ext->oe_dlmlock) {
+ EASSERTF(!overlapped(ext, cur), ext,
+ EXTSTR"\n", 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"\n", 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_dlmlock == cur->oe_dlmlock);
+ 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, 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;
+ loff_t 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);
+
+ osc_lru_add_batch(cli, &ext->oe_pages);
+ list_for_each_entry_safe(oap, tmp, &ext->oe_pages,
+ oap_pending_item) {
+ list_del_init(&oap->oap_rpc_item);
+ list_del_init(&oap->oap_pending_item);
+ if (last_off <= oap->oap_obj_off) {
+ last_off = oap->oap_obj_off;
+ last_count = oap->oap_count;
+ }
+
+ --ext->oe_nr_pages;
+ osc_ap_completion(env, cli, oap, sent, rc);
+ }
+ EASSERT(ext->oe_nr_pages == 0, ext);
+
+ if (!sent) {
+ lost_grant = ext->oe_grants;
+ } else if (blocksize < PAGE_CACHE_SIZE &&
+ last_count != PAGE_CACHE_SIZE) {
+ /* For short writes we shouldn't count parts of pages that
+ * span a whole chunk on the OST side, or our accounting goes
+ * wrong. Should match the code in filter_grant_check. */
+ int offset = last_off & ~PAGE_MASK;
+ int count = last_count + (offset & (blocksize - 1));
+ int end = (offset + last_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, enum osc_extent_state 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,
+ enum osc_extent_state 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 %u timedout, recovery in progress?\n",
+ cli_name(osc_cli(obj)), 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 than trunc_index */
+ list_for_each_entry_safe(oap, tmp, &ext->oe_pages,
+ oap_pending_item) {
+ pgoff_t index = osc_index(oap2osc(oap));
+ struct cl_page *page = oap2cl_page(oap);
+
+ LASSERT(list_empty(&oap->oap_rpc_item));
+
+ /* only discard the pages with their index greater than
+ * trunc_index, and ... */
+ if (index < trunc_index ||
+ (index == trunc_index && partial)) {
+ /* accounting how many pages remaining in the chunk
+ * so that we can calculate grants correctly. */
+ if (index >> ppc_bits == trunc_chunk)
+ ++pages_in_chunk;
+ continue;
+ }
+
+ list_del_init(&oap->oap_pending_item);
+
+ cl_page_get(page);
+ lu_ref_add(&page->cp_reference, "truncate", current);
+
+ if (cl_page_own(env, io, page) == 0) {
+ cl_page_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;
+ unsigned 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");
+
+ 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)) {
+ int last_oap_count = osc_refresh_count(env, last, OBD_BRW_WRITE);
+ LASSERT(last_oap_count > 0);
+ LASSERT(last->oap_page_off + last_oap_count <= PAGE_CACHE_SIZE);
+ last->oap_count = last_oap_count;
+ 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 */
+ 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,
+ unsigned 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;
+ unsigned 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;
+
+out:
+ osc_object_unlock(obj);
+ RETURN(rc);
+}
+
+static void osc_extent_tree_dump0(int level, struct osc_object *obj,
+ const char *func, int line)
+{
+ struct osc_extent *ext;
+ int cnt;
+
+ CDEBUG(level, "Dump object %p extents at %s:%d, mppr: %u.\n",
+ obj, func, line, osc_cli(obj)->cl_max_pages_per_rpc);
+
+ /* osc_object_lock(obj); */
+ cnt = 1;
+ for (ext = first_extent(obj); ext != NULL; ext = next_extent(ext))
+ OSC_EXTENT_DUMP(level, ext, "in tree %d.\n", cnt++);
+
+ cnt = 1;
+ list_for_each_entry(ext, &obj->oo_hp_exts, oe_link)
+ OSC_EXTENT_DUMP(level, ext, "hp %d.\n", cnt++);
+
+ cnt = 1;
+ list_for_each_entry(ext, &obj->oo_urgent_exts, oe_link)
+ OSC_EXTENT_DUMP(level, ext, "urgent %d.\n", cnt++);
+
+ cnt = 1;
+ list_for_each_entry(ext, &obj->oo_reading_exts, oe_link)
+ OSC_EXTENT_DUMP(level, ext, "reading %d.\n", cnt++);
+ /* osc_object_unlock(obj); */
+}
+
+/* ------------------ osc extent end ------------------ */
-static inline struct osc_page *oap2osc_page(struct osc_async_page *oap)
+static inline int osc_is_ready(struct osc_object *osc)
{
- return (struct osc_page *)container_of(oap, struct osc_page, ops_oap);
+ return !list_empty(&osc->oo_ready_item) ||
+ !list_empty(&osc->oo_hp_ready_item);
}
+#define OSC_IO_DEBUG(OSC, STR, args...) \
+ CDEBUG(D_CACHE, "obj %p ready %d|%c|%c wr %d|%c|%c rd %d|%c " STR, \
+ (OSC), osc_is_ready(OSC), \
+ list_empty_marker(&(OSC)->oo_hp_ready_item), \
+ list_empty_marker(&(OSC)->oo_ready_item), \
+ atomic_read(&(OSC)->oo_nr_writes), \
+ list_empty_marker(&(OSC)->oo_hp_exts), \
+ list_empty_marker(&(OSC)->oo_urgent_exts), \
+ atomic_read(&(OSC)->oo_nr_reads), \
+ list_empty_marker(&(OSC)->oo_reading_exts), \
+ ##args)
+
static int osc_make_ready(const struct lu_env *env, struct osc_async_page *oap,
int cmd)
{
struct osc_page *opg = oap2osc_page(oap);
- struct cl_page *page = cl_page_top(opg->ops_cl.cpl_page);
+ struct cl_page *page = oap2cl_page(oap);
int result;
LASSERT(cmd == OBD_BRW_WRITE); /* no cached reads */
struct osc_async_page *oap, int cmd)
{
struct osc_page *opg = oap2osc_page(oap);
- struct cl_page *page;
+ pgoff_t index = osc_index(oap2osc(oap));
struct cl_object *obj;
struct cl_attr *attr = &osc_env_info(env)->oti_attr;
/* 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);
if (result < 0)
return result;
kms = attr->cat_kms;
- if (cl_offset(obj, page->cp_index) >= kms)
+ if (cl_offset(obj, index) >= kms)
/* catch race with truncate */
return 0;
- else if (cl_offset(obj, page->cp_index + 1) > kms)
+ else if (cl_offset(obj, 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 osc_object *obj = cl2osc(opg->ops_cl.cpl_obj);
+ struct cl_page *page = oap2cl_page(oap);
enum cl_req_type crt;
int srvlock;
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);
/*
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);
- 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_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;
struct osc_stats *stats = &lu2osc_dev(ld)->od_stats;
- int bytes = oap->oap_count;
+ size_t bytes = oap->oap_count;
if (crt == CRT_READ)
stats->os_lockless_reads += bytes;
* 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: %lu/%lu dirty_pages: %ld/%lu " \
+ "dropped: %ld avail: %ld, reserved: %ld, flight: %d }" \
+ "lru {in list: %ld, left: %ld, waiters: %d }"fmt"\n", \
+ cli_name(__tmp), \
+ __tmp->cl_dirty_pages, __tmp->cl_dirty_max_pages, \
+ atomic_long_read(&obd_dirty_pages), obd_max_dirty_pages, \
+ __tmp->cl_lost_grant, __tmp->cl_avail_grant, \
+ __tmp->cl_reserved_grant, __tmp->cl_w_in_flight, \
+ atomic_long_read(&__tmp->cl_lru_in_list), \
+ atomic_long_read(&__tmp->cl_lru_busy), \
+ 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);
+ assert_spin_locked(&cli->cl_loi_list_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;
+ atomic_long_inc(&obd_dirty_pages);
+ cli->cl_dirty_pages++;
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);
+ assert_spin_locked(&cli->cl_loi_list_lock);
if (!(pga->flag & OBD_BRW_FROM_GRANT)) {
EXIT;
return;
}
pga->flag &= ~OBD_BRW_FROM_GRANT;
- cfs_atomic_dec(&obd_dirty_pages);
- cli->cl_dirty -= CFS_PAGE_SIZE;
+ atomic_long_dec(&obd_dirty_pages);
+ cli->cl_dirty_pages--;
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;
+ atomic_long_dec(&obd_dirty_transit_pages);
+ cli->cl_dirty_transit--;
}
- 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;
+static void osc_unreserve_grant(struct client_obd *cli,
+ unsigned int reserved, unsigned int unused)
+{
+ spin_lock(&cli->cl_loi_list_lock);
+ __osc_unreserve_grant(cli, reserved, unused);
+ if (unused > 0)
+ osc_wake_cache_waiters(cli);
+ spin_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)
+{
+ unsigned long grant = (1 << cli->cl_chunkbits) + cli->cl_extent_tax;
+
+ spin_lock(&cli->cl_loi_list_lock);
+ atomic_long_sub(nr_pages, &obd_dirty_pages);
+ cli->cl_dirty_pages -= nr_pages;
+ 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);
+ spin_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_pages << PAGE_CACHE_SHIFT);
}
-/* 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);
+ spin_lock(&cli->cl_loi_list_lock);
+ osc_release_write_grant(cli, &oap->oap_brw_page);
+ spin_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_pages < cli->cl_dirty_max_pages &&
+ 1 + atomic_long_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;
- cfs_atomic_inc(&obd_dirty_transit_pages);
+ cli->cl_dirty_transit++;
+ atomic_long_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;
+ spin_lock(&cli->cl_loi_list_lock);
+ rc = list_empty(&ocw->ocw_entry);
+ spin_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);
- int rc = -EDQUOT;
+ struct osc_object *osc = oap->oap_obj;
+ struct lov_oinfo *loi = osc->oo_oinfo;
+ struct osc_cache_waiter ocw;
+ struct l_wait_info lwi;
+ 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);
+ lwi = LWI_TIMEOUT_INTR(cfs_time_seconds(AT_OFF ? obd_timeout : at_max),
+ NULL, LWI_ON_SIGNAL_NOOP, NULL);
+
+ OSC_DUMP_GRANT(D_CACHE, cli, "need:%d\n", bytes);
+
+ spin_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_ar.ar_force_sync || loi->loi_ar.ar_force_sync)
- RETURN(-EDQUOT);
+ cli->cl_dirty_max_pages == 0 ||
+ cli->cl_ar.ar_force_sync || loi->loi_ar.ar_force_sync) {
+ OSC_DUMP_GRANT(D_CACHE, cli, "forced sync i/o\n");
+ 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)) {
+ OSC_DUMP_GRANT(D_CACHE, cli, "granted from cache\n");
+ 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.
* 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) {
- cfs_list_add_tail(&ocw.ocw_entry, &cli->cl_cache_waiters);
+ init_waitqueue_head(&ocw.ocw_waitq);
+ ocw.ocw_oap = oap;
+ ocw.ocw_grant = bytes;
+ while (cli->cl_dirty_pages > 0 || cli->cl_w_in_flight > 0) {
+ list_add_tail(&ocw.ocw_entry, &cli->cl_cache_waiters);
ocw.ocw_rc = 0;
+ spin_unlock(&cli->cl_loi_list_lock);
- 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);
+ cli_name(cli), &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;
+ spin_lock(&cli->cl_loi_list_lock);
+ if (rc < 0) {
+ /* l_wait_event is interrupted by signal or timed out */
+ list_del_init(&ocw.ocw_entry);
+ break;
+ }
+ LASSERT(list_empty(&ocw.ocw_entry));
rc = ocw.ocw_rc;
+
if (rc != -EDQUOT)
break;
+ if (osc_enter_cache_try(cli, oap, bytes, 0)) {
+ rc = 0;
+ break;
+ }
}
+ switch (rc) {
+ case 0:
+ OSC_DUMP_GRANT(D_CACHE, cli, "finally got grant space\n");
+ break;
+ case -ETIMEDOUT:
+ OSC_DUMP_GRANT(D_CACHE, cli,
+ "timeout, fall back to sync i/o\n");
+ osc_extent_tree_dump(D_CACHE, osc);
+ /* fall back to synchronous I/O */
+ rc = -EDQUOT;
+ break;
+ case -EINTR:
+ /* Ensures restartability - LU-3581 */
+ OSC_DUMP_GRANT(D_CACHE, cli, "interrupted\n");
+ rc = -ERESTARTSYS;
+ break;
+ case -EDQUOT:
+ OSC_DUMP_GRANT(D_CACHE, cli,
+ "no grant space, fall back to sync i/o\n");
+ break;
+ default:
+ CDEBUG(D_CACHE, "%s: event for cache space @ %p never arrived "
+ "due to %d, fall back to sync i/o\n",
+ cli_name(cli), &ocw, rc);
+ break;
+ }
+ EXIT;
+out:
+ spin_unlock(&cli->cl_loi_list_lock);
RETURN(rc);
}
/* caller must hold loi_list_lock */
void osc_wake_cache_waiters(struct client_obd *cli)
{
- cfs_list_t *l, *tmp;
+ struct list_head *l, *tmp;
struct osc_cache_waiter *ocw;
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)) {
+ list_for_each_safe(l, tmp, &cli->cl_cache_waiters) {
+ ocw = list_entry(l, struct osc_cache_waiter, ocw_entry);
+ list_del_init(&ocw->ocw_entry);
+
+ ocw->ocw_rc = -EDQUOT;
+ /* we can't dirty more */
+ if ((cli->cl_dirty_pages >= cli->cl_dirty_max_pages) ||
+ (1 + atomic_long_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;
+ "osc max %ld, sys max %ld\n",
+ cli->cl_dirty_pages, cli->cl_dirty_max_pages,
+ obd_max_dirty_pages);
+ 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 = -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);
- }
+ if (osc_enter_cache_try(cli, ocw->ocw_oap, ocw->ocw_grant, 0))
+ ocw->ocw_rc = 0;
+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);
- CDEBUG(D_CACHE, "wake up %p for oap %p, avail grant %ld\n",
- ocw, ocw->ocw_oap, cli->cl_avail_grant);
-
- cfs_waitq_signal(&ocw->ocw_waitq);
+ wake_up(&ocw->ocw_waitq);
}
EXIT;
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 = !!list_empty(&osc->oo_hp_exts);
return rpcs_in_flight(cli) >= cli->cl_max_rpcs_in_flight + hprpc;
}
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 (atomic_read(&osc->oo_nr_writes) == 0)
+ RETURN(0);
+ if (invalid_import) {
+ CDEBUG(D_CACHE, "invalid import forcing RPC\n");
+ RETURN(1);
+ }
+ if (!list_empty(&osc->oo_hp_exts)) {
+ CDEBUG(D_CACHE, "high prio request forcing RPC\n");
+ RETURN(1);
+ }
+ if (!list_empty(&osc->oo_urgent_exts)) {
+ CDEBUG(D_CACHE, "urgent request forcing RPC\n");
+ RETURN(1);
+ }
/* trigger a write rpc stream as long as there are dirtiers
* waiting for space. as they're waiting, they're not going to
* create more pages to coalesce with what's waiting.. */
- if (!cfs_list_empty(&cli->cl_cache_waiters)) {
+ if (!list_empty(&cli->cl_cache_waiters)) {
CDEBUG(D_CACHE, "cache waiters forcing RPC\n");
RETURN(1);
}
+ if (atomic_read(&osc->oo_nr_writes) >=
+ cli->cl_max_pages_per_rpc)
+ RETURN(1);
+ } else {
+ if (atomic_read(&osc->oo_nr_reads) == 0)
+ RETURN(0);
+ if (invalid_import) {
+ CDEBUG(D_CACHE, "invalid import forcing RPC\n");
+ RETURN(1);
+ }
+ /* all read are urgent. */
+ if (!list_empty(&osc->oo_reading_exts))
+ RETURN(1);
}
- 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) {
+ atomic_add(delta, &obj->oo_nr_writes);
+ atomic_add(delta, &cli->cl_pending_w_pages);
+ LASSERT(atomic_read(&obj->oo_nr_writes) >= 0);
+ } else {
+ atomic_add(delta, &obj->oo_nr_reads);
+ atomic_add(delta, &cli->cl_pending_r_pages);
+ LASSERT(atomic_read(&obj->oo_nr_reads) >= 0);
+ }
+ OSC_IO_DEBUG(obj, "update pending cmd %d delta %d.\n", cmd, delta);
}
-static int osc_makes_hprpc(struct osc_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 !list_empty(&obj->oo_hp_exts);
}
-static void on_list(cfs_list_t *item, cfs_list_t *list, int should_be_on)
+static void on_list(struct list_head *item, struct list_head *list,
+ int should_be_on)
{
- if (cfs_list_empty(item) && should_be_on)
- cfs_list_add_tail(item, list);
- else if (!cfs_list_empty(item) && !should_be_on)
- cfs_list_del_init(item);
+ if (list_empty(item) && should_be_on)
+ list_add_tail(item, list);
+ else if (!list_empty(item) && !should_be_on)
+ list_del_init(item);
}
/* maintain the osc's cli list membership invariants so that osc_send_oap_rpc
* can find pages to build into rpcs quickly */
-static 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);
}
on_list(&osc->oo_write_item, &cli->cl_loi_write_list,
- osc->oo_write_pages.oop_num_pending);
+ 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);
+ 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;
+
+ spin_lock(&cli->cl_loi_list_lock);
+ is_ready = __osc_list_maint(cli, osc);
+ spin_unlock(&cli->cl_loi_list_lock);
+
+ return is_ready;
}
/* this is trying to propogate async writeback errors back up to the
ar->ar_force_sync = 0;
}
-static void osc_oap_to_pending(struct osc_async_page *oap)
-{
- struct osc_object *osc = oap->oap_obj;
- struct osc_oap_pages *lop;
-
- if (oap->oap_cmd & OBD_BRW_WRITE)
- lop = &osc->oo_write_pages;
- else
- lop = &osc->oo_read_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);
-}
-
/* 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;
oap->oap_request = NULL;
}
- cfs_spin_lock(&oap->oap_lock);
+ /* As the transfer for this page is being done, clear the flags */
+ spin_lock(&oap->oap_lock);
oap->oap_async_flags = 0;
- cfs_spin_unlock(&oap->oap_lock);
+ spin_unlock(&oap->oap_lock);
oap->oap_interrupted = 0;
- if (oap->oap_cmd & OBD_BRW_WRITE) {
+ if (oap->oap_cmd & OBD_BRW_WRITE && xid > 0) {
+ spin_lock(&cli->cl_loi_list_lock);
osc_process_ar(&cli->cl_ar, xid, rc);
osc_process_ar(&loi->loi_ar, xid, rc);
+ spin_unlock(&cli->cl_loi_list_lock);
}
- 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;
- }
-
- rc = osc_completion(env, oap, oap->oap_cmd, oa, rc);
-
- /* 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 */
+ rc = osc_completion(env, oap, oap->oap_cmd, rc);
if (rc)
- /* upper layer wants to leave the page on pending queue */
- osc_oap_to_pending(oap);
- else
- osc_exit_cache(cli, oap, sent);
+ CERROR("completion on oap %p obj %p returns %d.\n",
+ oap, osc, rc);
+
EXIT;
}
/**
- * prepare pages for ASYNC io and put pages in send queue.
- *
- * \param cmd OBD_BRW_* macroses
- * \param lop pending pages
- *
- * \return zero if no page added to send queue.
- * \return 1 if pages successfully added to send queue.
- * \return negative on errors.
+ * 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
-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)
-{
- 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;
+static int try_to_add_extent_for_io(struct client_obd *cli,
+ struct osc_extent *ext,
+ struct list_head *rpclist,
+ unsigned int *pc, unsigned int *max_pages)
+{
+ struct osc_extent *tmp;
+ struct osc_async_page *oap = list_first_entry(&ext->oe_pages,
+ struct osc_async_page,
+ oap_pending_item);
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;
+ EASSERT((ext->oe_state == OES_CACHE || ext->oe_state == OES_LOCK_DONE),
+ ext);
- /* 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;
+ *max_pages = max(ext->oe_mppr, *max_pages);
+ if (*pc + ext->oe_nr_pages > *max_pages)
+ RETURN(0);
+
+ list_for_each_entry(tmp, rpclist, oe_link) {
+ struct osc_async_page *oap2;
+ oap2 = list_first_entry(&tmp->oe_pages, struct osc_async_page,
+ oap_pending_item);
+ EASSERT(tmp->oe_owner == current, tmp);
+#if 0
+ if (overlapped(tmp, ext)) {
+ OSC_EXTENT_DUMP(D_ERROR, tmp, "overlapped %p.\n", ext);
+ EASSERT(0, ext);
+ }
+#endif
+ if (oap2cl_page(oap)->cp_type != oap2cl_page(oap2)->cp_type) {
+ CDEBUG(D_CACHE, "Do not permit different type of IO"
+ " for a same RPC\n");
+ RETURN(0);
}
- /* If 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;
+ if (tmp->oe_srvlock != ext->oe_srvlock ||
+ !tmp->oe_grants != !ext->oe_grants)
+ RETURN(0);
- starting_page_off = oap->oap_page_off;
- starting_offset = oap->oap_obj_off + starting_page_off;
- } else if (oap->oap_page_off != 0)
- break;
+ /* remove break for strict check */
+ 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;
+ *pc += ext->oe_nr_pages;
+ list_move_tail(&ext->oe_link, rpclist);
+ ext->oe_owner = current;
+ RETURN(1);
+}
+
+/**
+ * In order to prevent multiple ptlrpcd from breaking contiguous extents,
+ * get_write_extent() takes all appropriate extents in atomic.
+ *
+ * The following policy is used to collect extents for IO:
+ * 1. Add as many HP extents as possible;
+ * 2. Add the first urgent extent in urgent extent list and take it out of
+ * urgent list;
+ * 3. Add subsequent extents of this urgent extent;
+ * 4. If urgent list is not empty, goto 2;
+ * 5. Traverse the extent tree from the 1st extent;
+ * 6. Above steps exit if there is no space in this RPC.
+ */
+static unsigned int get_write_extents(struct osc_object *obj,
+ struct list_head *rpclist)
+{
+ struct client_obd *cli = osc_cli(obj);
+ struct osc_extent *ext;
+ unsigned int page_count = 0;
+ unsigned int max_pages = cli->cl_max_pages_per_rpc;
+
+ LASSERT(osc_object_is_locked(obj));
+ while (!list_empty(&obj->oo_hp_exts)) {
+ ext = list_entry(obj->oo_hp_exts.next, struct osc_extent,
+ oe_link);
+ LASSERT(ext->oe_state == OES_CACHE);
+ if (!try_to_add_extent_for_io(cli, ext, rpclist, &page_count,
+ &max_pages))
+ return page_count;
+ EASSERT(ext->oe_nr_pages <= max_pages, ext);
+ }
+ if (page_count == max_pages)
+ return page_count;
- /* 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);
+ while (!list_empty(&obj->oo_urgent_exts)) {
+ ext = list_entry(obj->oo_urgent_exts.next,
+ struct osc_extent, oe_link);
+ if (!try_to_add_extent_for_io(cli, ext, rpclist, &page_count,
+ &max_pages))
+ return page_count;
- /* 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 (!ext->oe_intree)
+ continue;
+
+ while ((ext = next_extent(ext)) != NULL) {
+ if ((ext->oe_state != OES_CACHE) ||
+ (!list_empty(&ext->oe_link) &&
+ ext->oe_owner != NULL))
+ continue;
+
+ if (!try_to_add_extent_for_io(cli, ext, rpclist,
+ &page_count, &max_pages))
+ return page_count;
}
- if (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);
+ }
+ if (page_count == max_pages)
+ return page_count;
+
+ ext = first_extent(obj);
+ while (ext != NULL) {
+ if ((ext->oe_state != OES_CACHE) ||
+ /* this extent may be already in current rpclist */
+ (!list_empty(&ext->oe_link) && ext->oe_owner != NULL)) {
+ ext = next_extent(ext);
continue;
}
- /* 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 (!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)
+__must_hold(osc)
+{
+ struct list_head rpclist = LIST_HEAD_INIT(rpclist);
+ struct osc_extent *ext;
+ struct osc_extent *tmp;
+ struct osc_extent *first = NULL;
+ unsigned int 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, list_empty(&rpclist)));
+
+ if (list_empty(&rpclist))
+ RETURN(0);
+
+ osc_update_pending(osc, OBD_BRW_WRITE, -page_count);
+
+ list_for_each_entry(ext, &rpclist, oe_link) {
+ LASSERT(ext->oe_state == OES_CACHE ||
+ ext->oe_state == OES_LOCK_DONE);
+ if (ext->oe_state == OES_CACHE)
+ osc_extent_state_set(ext, OES_LOCKING);
+ else
+ osc_extent_state_set(ext, OES_RPC);
+ }
+
+ /* we're going to grab page lock, so release object lock because
+ * lock order is page lock -> object lock. */
+ osc_object_unlock(osc);
+
+ list_for_each_entry_safe(ext, tmp, &rpclist, oe_link) {
+ if (ext->oe_state == OES_LOCKING) {
+ rc = osc_extent_make_ready(env, ext);
+ if (unlikely(rc < 0)) {
+ list_del_init(&ext->oe_link);
+ osc_extent_finish(env, ext, 0, rc);
+ continue;
+ }
+ }
+ if (first == NULL) {
+ first = ext;
+ srvlock = ext->oe_srvlock;
+ } else {
+ LASSERT(srvlock == ext->oe_srvlock);
+ }
+ }
+
+ if (!list_empty(&rpclist)) {
+ LASSERT(page_count > 0);
+ rc = osc_build_rpc(env, cli, &rpclist, OBD_BRW_WRITE);
+ LASSERT(list_empty(&rpclist));
+ }
- if (page_count >= cli->cl_max_pages_per_rpc)
- break;
+ osc_object_lock(osc);
+ RETURN(rc);
+}
+
+/**
+ * prepare pages for ASYNC io and put pages in send queue.
+ *
+ * \param cmd OBD_BRW_* macroses
+ * \param lop pending pages
+ *
+ * \return zero if no page added to send queue.
+ * \return 1 if pages successfully added to send queue.
+ * \return negative on errors.
+ */
+static int
+osc_send_read_rpc(const struct lu_env *env, struct client_obd *cli,
+ struct osc_object *osc)
+__must_hold(osc)
+{
+ struct osc_extent *ext;
+ struct osc_extent *next;
+ struct list_head rpclist = LIST_HEAD_INIT(rpclist);
+ unsigned int page_count = 0;
+ unsigned int max_pages = cli->cl_max_pages_per_rpc;
+ int rc = 0;
+ ENTRY;
- /* 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));
+ 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 (!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);
+ LASSERT(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) ({ \
+ struct list_head *__tmp = (list)->next; \
+ list_del_init(__tmp); \
+ list_entry(__tmp, struct osc_object, oo_##item); \
+})
/* This is called by osc_check_rpcs() to find which objects have pages that
* we could be sending. These lists are maintained by osc_makes_rpc(). */
/* First return objects that have blocked locks so that they
* will be flushed quickly and other clients can get the lock,
* then objects which have pages ready to be stuffed into RPCs */
- if (!cfs_list_empty(&cli->cl_loi_hp_ready_list))
+ if (!list_empty(&cli->cl_loi_hp_ready_list))
RETURN(list_to_obj(&cli->cl_loi_hp_ready_list, hp_ready_item));
- if (!cfs_list_empty(&cli->cl_loi_ready_list))
+ if (!list_empty(&cli->cl_loi_ready_list))
RETURN(list_to_obj(&cli->cl_loi_ready_list, ready_item));
/* then if we have cache waiters, return all objects with queued
* writes. This is especially important when many small files
* have filled up the cache and not been fired into rpcs because
* they don't pass the nr_pending/object threshhold */
- if (!cfs_list_empty(&cli->cl_cache_waiters) &&
- !cfs_list_empty(&cli->cl_loi_write_list))
+ if (!list_empty(&cli->cl_cache_waiters) &&
+ !list_empty(&cli->cl_loi_write_list))
RETURN(list_to_obj(&cli->cl_loi_write_list, write_item));
/* then return all queued objects when we have an invalid import
* so that they get flushed */
if (cli->cl_import == NULL || cli->cl_import->imp_invalid) {
- if (!cfs_list_empty(&cli->cl_loi_write_list))
+ if (!list_empty(&cli->cl_loi_write_list))
RETURN(list_to_obj(&cli->cl_loi_write_list,
write_item));
- if (!cfs_list_empty(&cli->cl_loi_read_list))
+ if (!list_empty(&cli->cl_loi_read_list))
RETURN(list_to_obj(&cli->cl_loi_read_list,
read_item));
}
}
/* called with the loi list lock held */
-static void osc_check_rpcs(const struct lu_env *env, struct client_obd *cli,
- pdl_policy_t pol)
+static void osc_check_rpcs(const struct lu_env *env, struct client_obd *cli)
+__must_hold(&cli->cl_loi_list_lock)
{
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);
+ spin_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
* 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);
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:
* 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);
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;
+ spin_lock(&cli->cl_loi_list_lock);
+ }
+}
+
+static int osc_io_unplug0(const struct lu_env *env, struct client_obd *cli,
+ struct osc_object *osc, int async)
+{
+ int rc = 0;
+
+ if (osc != NULL && osc_list_maint(cli, osc) == 0)
+ return 0;
+
+ if (!async) {
+ spin_lock(&cli->cl_loi_list_lock);
+ osc_check_rpcs(env, cli);
+ spin_unlock(&cli->cl_loi_list_lock);
+ } 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)
+{
+ return osc_io_unplug0(env, cli, osc, 1);
}
void osc_io_unplug(const struct lu_env *env, struct client_obd *cli,
- struct osc_object *osc, pdl_policy_t pol)
+ struct osc_object *osc)
{
- if (osc)
- osc_list_maint(cli, osc);
- osc_check_rpcs(env, cli, pol);
+ (void)osc_io_unplug0(env, cli, osc, 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;
oap->oap_page = page;
oap->oap_obj_off = offset;
- LASSERT(!(offset & ~CFS_PAGE_MASK));
+ LASSERT(!(offset & ~PAGE_MASK));
if (!client_is_remote(exp) && cfs_capable(CFS_CAP_SYS_RESOURCE))
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);
+ INIT_LIST_HEAD(&oap->oap_pending_item);
+ 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;
+ unsigned int tmp;
+ unsigned int grants = 0;
+ u32 brw_flags = OBD_BRW_ASYNC;
+ int cmd = OBD_BRW_WRITE;
+ int need_release = 0;
+ int rc = 0;
ENTRY;
if (oap->oap_magic != OAP_MAGIC)
if (cli->cl_import == NULL || cli->cl_import->imp_invalid)
RETURN(-EIO);
- if (!cfs_list_empty(&oap->oap_pending_item) ||
- !cfs_list_empty(&oap->oap_urgent_item) ||
- !cfs_list_empty(&oap->oap_rpc_item))
+ if (!list_empty(&oap->oap_pending_item) ||
+ !list_empty(&oap->oap_rpc_item))
RETURN(-EBUSY);
/* Set the OBD_BRW_SRVLOCK before the page is queued. */
brw_flags |= ops->ops_srvlock ? OBD_BRW_SRVLOCK : 0;
- if (!client_is_remote(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;
}
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);
-
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) {
- client_obd_list_unlock(&cli->cl_loi_list_lock);
- RETURN(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 = osc_index(oap2osc(oap));
+
+ /* 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 */
+ spin_lock(&cli->cl_loi_list_lock);
+ rc = osc_enter_cache_try(cli, oap, grants, 0);
+ spin_unlock(&cli->cl_loi_list_lock);
+ if (rc == 0) { /* try failed */
+ grants = 0;
+ need_release = 1;
+ } else if (ext->oe_end < index) {
+ 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) {
+ 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);
+ }
- CDEBUG(D_CACHE, "Queued writeback work for client obd %p/%d.\n",
- cli, rc);
+ LASSERT(ergo(rc == 0, ext != NULL));
+ if (ext != NULL) {
+ EASSERTF(ext->oe_end >= index && ext->oe_start <= index,
+ ext, "index = %lu.\n", index);
+ LASSERT((oap->oap_brw_flags & OBD_BRW_FROM_GRANT) != 0);
+
+ osc_object_lock(osc);
+ if (ext->oe_nr_pages == 0)
+ ext->oe_srvlock = ops->ops_srvlock;
+ else
+ LASSERT(ext->oe_srvlock == ops->ops_srvlock);
+ ++ext->oe_nr_pages;
+ list_add_tail(&oap->oap_pending_item, &ext->oe_pages);
+ osc_object_unlock(osc);
}
- 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;
+ int rc = 0;
+ ENTRY;
+
+ LASSERT(oap->oap_magic == OAP_MAGIC);
+
+ CDEBUG(D_INFO, "teardown oap %p page %p at index %lu.\n",
+ oap, ops, osc_index(oap2osc(oap)));
+
+ if (!list_empty(&oap->oap_rpc_item)) {
+ CDEBUG(D_CACHE, "oap %p is not in cache.\n", oap);
+ rc = -EBUSY;
+ } else if (!list_empty(&oap->oap_pending_item)) {
+ struct osc_extent *ext = NULL;
+
+ osc_object_lock(obj);
+ ext = osc_extent_lookup(obj, osc_index(oap2osc(oap)));
+ osc_object_unlock(obj);
+ /* 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",
+ osc_index(oap2osc(oap)));
+ rc = -EBUSY;
+ }
+ 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 = osc_index(ops);
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, cp, "flush an in-rpc page?\n");
+ LASSERT(0);
+ break;
+ case OES_LOCKING:
+ /* If we know this extent is being written out, we should abort
+ * so that the writer can make this page ready. Otherwise, there
+ * exists a deadlock problem because other process can wait for
+ * page writeback bit holding page lock; and meanwhile in
+ * vvp_page_make_ready(), we need to grab page lock before
+ * really sending the RPC. */
+ case OES_TRUNC:
+ /* race with truncate, page will be redirtied */
+ case OES_ACTIVE:
+ /* The extent is active so we need to abort and let the caller
+ * re-dirty the page. If we continued on here, and we were the
+ * one making the extent active, we could deadlock waiting for
+ * the page writeback to clear but it won't because the extent
+ * is active and won't be written out. */
+ GOTO(out, rc = -EAGAIN);
+ default:
+ break;
}
- client_obd_list_lock(&cli->cl_loi_list_lock);
+ rc = cl_page_prep(env, io, 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 (list_empty(&ext->oe_link))
+ 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;
+ struct list_head *plist;
+ pgoff_t index = osc_index(ops);
+ 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;
+ }
+ 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 (!cfs_list_empty(&oap->oap_pending_item)) {
- cfs_list_del_init(&oap->oap_pending_item);
- lop_update_pending(cli, lop, oap->oap_cmd, -1);
+ if (found != NULL) {
+ list_del_init(&found->oe_link);
+ osc_update_pending(obj, cmd, -found->oe_nr_pages);
+ osc_object_unlock(obj);
+
+ osc_extent_finish(env, found, 0, -EINTR);
+ osc_extent_put(env, found);
+ rc = 0;
+ } else {
+ osc_object_unlock(obj);
+ /* ok, it's been put in an rpc. only one oap gets a request
+ * reference */
+ if (oap->oap_request != NULL) {
+ ptlrpc_mark_interrupted(oap->oap_request);
+ ptlrpcd_wake(oap->oap_request);
+ ptlrpc_req_finished(oap->oap_request);
+ oap->oap_request = NULL;
+ }
}
+
osc_list_maint(cli, obj);
- 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,
+ struct list_head *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));
+ list_for_each_entry(oap, list, oap_pending_item) {
+ pgoff_t index = osc_index(oap2osc(oap));
+ if (index > end)
+ end = index;
+ if (index < start)
+ start = index;
+ ++page_count;
+ mppr <<= (page_count > mppr);
+ }
+
+ ext = osc_extent_alloc(obj);
+ if (ext == NULL) {
+ struct osc_async_page *tmp;
- if (oap->oap_cmd & OBD_BRW_WRITE) {
- lop = &obj->oo_write_pages;
+ list_for_each_entry_safe(oap, tmp, list, oap_pending_item) {
+ list_del_init(&oap->oap_pending_item);
+ osc_ap_completion(env, cli, oap, 0, -ENOMEM);
+ }
+ RETURN(-ENOMEM);
+ }
+
+ ext->oe_rw = !!(cmd & OBD_BRW_READ);
+ ext->oe_sync = 1;
+ ext->oe_urgent = 1;
+ ext->oe_start = start;
+ ext->oe_end = ext->oe_max_end = end;
+ ext->oe_obj = obj;
+ ext->oe_srvlock = !!(brw_flags & OBD_BRW_SRVLOCK);
+ ext->oe_nr_pages = page_count;
+ ext->oe_mppr = mppr;
+ list_splice_init(list, &ext->oe_pages);
+
+ osc_object_lock(obj);
+ /* Reuse the initial refcount for RPC, don't drop it */
+ osc_extent_state_set(ext, OES_LOCK_DONE);
+ if (cmd & OBD_BRW_WRITE) {
+ list_add_tail(&ext->oe_link, &obj->oo_urgent_exts);
+ osc_update_pending(obj, OBD_BRW_WRITE, page_count);
} else {
- lop = &obj->oo_read_pages;
+ 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_async(env, cli, obj);
+ RETURN(0);
+}
+
+/**
+ * Called by osc_io_setattr_start() to freeze and destroy covering extents.
+ */
+int osc_cache_truncate_start(const struct lu_env *env, struct osc_object *obj,
+ __u64 size, struct osc_extent **extp)
+{
+ struct client_obd *cli = osc_cli(obj);
+ struct osc_extent *ext;
+ struct osc_extent *waiting = NULL;
+ pgoff_t index;
+ struct list_head list = LIST_HEAD_INIT(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(list_empty(&ext->oe_link), ext);
+ 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 (!list_empty(&list)) {
+ int rc;
+
+ ext = list_entry(list.next, struct osc_extent, oe_link);
+ list_del_init(&ext->oe_link);
+
+ /* extent may be in OES_ACTIVE state because inode mutex
+ * is released before osc_io_end() in file write case */
+ if (ext->oe_state != OES_TRUNC)
+ osc_extent_wait(env, ext, OES_TRUNC);
+
+ rc = osc_extent_truncate(ext, index, partial);
+ if (rc < 0) {
+ if (result == 0)
+ result = rc;
+
+ OSC_EXTENT_DUMP(D_ERROR, ext,
+ "truncate error %d\n", rc);
+ } else if (ext->oe_nr_pages == 0) {
+ osc_extent_remove(ext);
+ } else {
+ /* this must be an overlapped extent which means only
+ * part of pages in this extent have been truncated.
+ */
+ EASSERTF(ext->oe_start <= index, ext,
+ "trunc index = %lu/%d.\n", index, partial);
+ /* fix index to skip this partially truncated extent */
+ index = ext->oe_end + 1;
+ partial = false;
+
+ /* we need to hold this extent in OES_TRUNC state so
+ * that no writeback will happen. This is to avoid
+ * BUG 17397.
+ * Only partial truncate can reach here, if @size is
+ * not zero, the caller should provide a valid @extp. */
+ LASSERT(*extp == NULL);
+ *extp = 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_extent *ext)
{
- struct osc_async_page *oap = &ops->ops_oap;
- int rc = -EBUSY;
+ if (ext != NULL) {
+ struct osc_object *obj = ext->oe_obj;
+ bool unplug = false;
+
+ EASSERT(ext->oe_nr_pages > 0, ext);
+ EASSERT(ext->oe_state == OES_TRUNC, ext);
+ EASSERT(!ext->oe_urgent, ext);
+
+ OSC_EXTENT_DUMP(D_CACHE, ext, "trunc -> cache.\n");
+ osc_object_lock(obj);
+ osc_extent_state_set(ext, OES_CACHE);
+ if (ext->oe_fsync_wait && !ext->oe_urgent) {
+ ext->oe_urgent = 1;
+ list_move_tail(&ext->oe_link, &obj->oo_urgent_exts);
+ unplug = true;
+ }
+ osc_update_pending(obj, OBD_BRW_WRITE, ext->oe_nr_pages);
+ osc_object_unlock(obj);
+ osc_extent_put(env, ext);
+
+ if (unplug)
+ osc_io_unplug_async(env, osc_cli(obj), obj);
+ }
+}
+
+/**
+ * Wait for extents in a specific range to be written out.
+ * The caller must have called osc_cache_writeback_range() to issue IO
+ * otherwise it will take a long time for this function to finish.
+ *
+ * Caller must hold inode_mutex , or cancel exclusive dlm lock so that
+ * nobody else can dirty this range of file while we're waiting for
+ * extents to be written.
+ */
+int osc_cache_wait_range(const struct lu_env *env, struct osc_object *obj,
+ pgoff_t start, pgoff_t end)
+{
+ struct osc_extent *ext;
+ pgoff_t index = start;
+ int result = 0;
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;
+ }
+
+ EASSERT(ergo(ext->oe_state == OES_CACHE,
+ ext->oe_hp || ext->oe_urgent), ext);
+ EASSERT(ergo(ext->oe_state == OES_ACTIVE,
+ !ext->oe_hp && ext->oe_urgent), ext);
+
+ index = ext->oe_end + 1;
+ osc_extent_get(ext);
+ osc_object_unlock(obj);
+
+ rc = osc_extent_wait(env, ext, OES_INV);
+ if (result == 0)
+ result = rc;
+ osc_extent_put(env, ext);
+ goto again;
}
+ osc_object_unlock(obj);
- /*
- * 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;
+ OSC_IO_DEBUG(obj, "sync file range.\n");
+ RETURN(result);
+}
+
+/**
+ * Called to write out a range of osc object.
+ *
+ * @hp : should be set this is caused by lock cancel;
+ * @discard: is set if dirty pages should be dropped - file will be deleted or
+ * truncated, this implies there is no partially discarding extents.
+ *
+ * Return how many pages will be issued, or error code if error occurred.
+ */
+int osc_cache_writeback_range(const struct lu_env *env, struct osc_object *obj,
+ pgoff_t start, pgoff_t end, int hp, int discard)
+{
+ struct osc_extent *ext;
+ struct list_head discard_list = LIST_HEAD_INIT(discard_list);
+ bool unplug = false;
+ int result = 0;
+ ENTRY;
- cfs_list_del_init(&oap->oap_pending_item);
- cfs_list_del_init(&oap->oap_urgent_item);
+ 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;
- 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);
+ ext->oe_fsync_wait = 1;
+ switch (ext->oe_state) {
+ case OES_CACHE:
+ result += ext->oe_nr_pages;
+ if (!discard) {
+ struct list_head *list = NULL;
+ if (hp) {
+ EASSERT(!ext->oe_hp, ext);
+ ext->oe_hp = 1;
+ list = &obj->oo_hp_exts;
+ } else if (!ext->oe_urgent) {
+ ext->oe_urgent = 1;
+ list = &obj->oo_urgent_exts;
+ }
+ if (list != NULL)
+ list_move_tail(&ext->oe_link, list);
+ unplug = true;
+ } else {
+ /* the only discarder is lock cancelling, so
+ * [start, end] must contain this extent */
+ EASSERT(ext->oe_start >= start &&
+ ext->oe_max_end <= end, ext);
+ osc_extent_state_set(ext, OES_LOCKING);
+ ext->oe_owner = current;
+ list_move_tail(&ext->oe_link,
+ &discard_list);
+ osc_update_pending(obj, OBD_BRW_WRITE,
+ -ext->oe_nr_pages);
+ }
+ break;
+ case OES_ACTIVE:
+ /* It's pretty bad to wait for ACTIVE extents, because
+ * we don't know how long we will wait for it to be
+ * flushed since it may be blocked at awaiting more
+ * grants. We do this for the correctness of fsync. */
+ LASSERT(hp == 0 && discard == 0);
+ ext->oe_urgent = 1;
+ break;
+ case OES_TRUNC:
+ /* this extent is being truncated, can't do anything
+ * for it now. it will be set to urgent after truncate
+ * is finished in osc_cache_truncate_end(). */
+ default:
+ break;
+ }
+ ext = next_extent(ext);
}
+ osc_object_unlock(obj);
+
+ LASSERT(ergo(!discard, list_empty(&discard_list)));
+ if (!list_empty(&discard_list)) {
+ struct osc_extent *tmp;
+ int rc;
+
+ osc_list_maint(osc_cli(obj), obj);
+ list_for_each_entry_safe(ext, tmp, &discard_list, oe_link) {
+ list_del_init(&ext->oe_link);
+ EASSERT(ext->oe_state == OES_LOCKING, ext);
+
+ /* Discard caching pages. We don't actually write this
+ * extent out but we complete it as if we did. */
+ rc = osc_extent_make_ready(env, ext);
+ if (unlikely(rc < 0)) {
+ OSC_EXTENT_DUMP(D_ERROR, ext,
+ "make_ready returned %d\n", rc);
+ if (result >= 0)
+ result = rc;
+ }
- RETURN(rc);
+ /* finish the extent as if the pages were sent */
+ osc_extent_finish(env, ext, 0, 0);
+ }
+ }
+
+ if (unplug)
+ osc_io_unplug(env, osc_cli(obj), obj);
+
+ if (hp || discard) {
+ int rc;
+ rc = osc_cache_wait_range(env, obj, start, end);
+ if (result >= 0 && rc < 0)
+ result = rc;
+ }
+
+ OSC_IO_DEBUG(obj, "pageout [%lu, %lu], %d.\n", start, end, result);
+ RETURN(result);
}
-int osc_queue_sync_page(const struct lu_env *env, struct osc_page *opg,
- int cmd, int brw_flags)
+/**
+ * Returns a list of pages by a given [start, end] of \a obj.
+ *
+ * \param resched If not NULL, then we give up before hogging CPU for too
+ * long and set *resched = 1, in that case caller should implement a retry
+ * logic.
+ *
+ * Gang tree lookup (radix_tree_gang_lookup()) optimization is absolutely
+ * crucial in the face of [offset, EOF] locks.
+ *
+ * Return at least one page in @queue unless there is no covered page.
+ */
+int osc_page_gang_lookup(const struct lu_env *env, struct cl_io *io,
+ struct osc_object *osc, pgoff_t start, pgoff_t end,
+ osc_page_gang_cbt cb, void *cbdata)
{
- struct osc_async_page *oap = &opg->ops_oap;
- struct client_obd *cli = oap->oap_cli;
- int flags = 0;
+ struct osc_page *ops;
+ void **pvec;
+ pgoff_t idx;
+ unsigned int nr;
+ unsigned int i;
+ unsigned int j;
+ int res = CLP_GANG_OKAY;
+ bool tree_lock = true;
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;
+ idx = start;
+ pvec = osc_env_info(env)->oti_pvec;
+ spin_lock(&osc->oo_tree_lock);
+ while ((nr = radix_tree_gang_lookup(&osc->oo_tree, pvec,
+ idx, OTI_PVEC_SIZE)) > 0) {
+ struct cl_page *page;
+ bool end_of_region = false;
+
+ for (i = 0, j = 0; i < nr; ++i) {
+ ops = pvec[i];
+ pvec[i] = NULL;
+
+ idx = osc_index(ops);
+ if (idx > end) {
+ end_of_region = true;
+ 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;
+ page = ops->ops_cl.cpl_page;
+ LASSERT(page->cp_type == CPT_CACHEABLE);
+ if (page->cp_state == CPS_FREEING)
+ continue;
- 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;
+ cl_page_get(page);
+ lu_ref_add_atomic(&page->cp_reference,
+ "gang_lookup", current);
+ pvec[j++] = ops;
+ }
+ ++idx;
+
+ /*
+ * Here a delicate locking dance is performed. Current thread
+ * holds a reference to a page, but has to own it before it
+ * can be placed into queue. Owning implies waiting, so
+ * radix-tree lock is to be released. After a wait one has to
+ * check that pages weren't truncated (cl_page_own() returns
+ * error in the latter case).
+ */
+ spin_unlock(&osc->oo_tree_lock);
+ tree_lock = false;
+
+ for (i = 0; i < j; ++i) {
+ ops = pvec[i];
+ if (res == CLP_GANG_OKAY)
+ res = (*cb)(env, io, ops, cbdata);
+
+ page = ops->ops_cl.cpl_page;
+ lu_ref_del(&page->cp_reference, "gang_lookup", current);
+ cl_page_put(env, page);
+ }
+ if (nr < OTI_PVEC_SIZE || end_of_region)
+ break;
+
+ if (res == CLP_GANG_OKAY && need_resched())
+ res = CLP_GANG_RESCHED;
+ if (res != CLP_GANG_OKAY)
+ break;
+
+ spin_lock(&osc->oo_tree_lock);
+ tree_lock = true;
}
+ if (tree_lock)
+ spin_unlock(&osc->oo_tree_lock);
+ RETURN(res);
+}
- 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);
+/**
+ * Check if page @page is covered by an extra lock or discard it.
+ */
+static int check_and_discard_cb(const struct lu_env *env, struct cl_io *io,
+ struct osc_page *ops, void *cbdata)
+{
+ struct osc_thread_info *info = osc_env_info(env);
+ struct osc_object *osc = cbdata;
+ pgoff_t index;
+
+ index = osc_index(ops);
+ if (index >= info->oti_fn_index) {
+ struct ldlm_lock *tmp;
+ struct cl_page *page = ops->ops_cl.cpl_page;
+
+ /* refresh non-overlapped index */
+ tmp = osc_dlmlock_at_pgoff(env, osc, index,
+ OSC_DAP_FL_TEST_LOCK);
+ if (tmp != NULL) {
+ __u64 end = tmp->l_policy_data.l_extent.end;
+ /* Cache the first-non-overlapped index so as to skip
+ * all pages within [index, oti_fn_index). This is safe
+ * because if tmp lock is canceled, it will discard
+ * these pages. */
+ info->oti_fn_index = cl_index(osc2cl(osc), end + 1);
+ if (end == OBD_OBJECT_EOF)
+ info->oti_fn_index = CL_PAGE_EOF;
+ LDLM_LOCK_PUT(tmp);
+ } else if (cl_page_own(env, io, page) == 0) {
+ /* discard the page */
+ cl_page_discard(env, io, page);
+ cl_page_disown(env, io, page);
+ } else {
+ LASSERT(page->cp_state == CPS_FREEING);
+ }
+ }
- cfs_spin_lock(&oap->oap_lock);
- oap->oap_async_flags |= OSC_FLAGS | flags;
- cfs_spin_unlock(&oap->oap_lock);
+ info->oti_next_index = index + 1;
+ return CLP_GANG_OKAY;
+}
- osc_oap_to_pending(oap);
- RETURN(0);
+static int discard_cb(const struct lu_env *env, struct cl_io *io,
+ struct osc_page *ops, void *cbdata)
+{
+ struct osc_thread_info *info = osc_env_info(env);
+ struct cl_page *page = ops->ops_cl.cpl_page;
+
+ /* page is top page. */
+ info->oti_next_index = osc_index(ops) + 1;
+ if (cl_page_own(env, io, page) == 0) {
+ if (!ergo(page->cp_type == CPT_CACHEABLE,
+ !PageDirty(cl_page_vmpage(page))))
+ CL_PAGE_DEBUG(D_ERROR, env, page,
+ "discard dirty page?\n");
+
+ /* discard the page */
+ cl_page_discard(env, io, page);
+ cl_page_disown(env, io, page);
+ } else {
+ LASSERT(page->cp_state == CPS_FREEING);
+ }
+
+ return CLP_GANG_OKAY;
+}
+
+/**
+ * Discard pages protected by the given lock. This function traverses radix
+ * tree to find all covering pages and discard them. If a page is being covered
+ * by other locks, it should remain in cache.
+ *
+ * If error happens on any step, the process continues anyway (the reasoning
+ * behind this being that lock cancellation cannot be delayed indefinitely).
+ */
+int osc_lock_discard_pages(const struct lu_env *env, struct osc_object *osc,
+ pgoff_t start, pgoff_t end, enum cl_lock_mode mode)
+{
+ struct osc_thread_info *info = osc_env_info(env);
+ struct cl_io *io = &info->oti_io;
+ osc_page_gang_cbt cb;
+ int res;
+ int result;
+
+ ENTRY;
+
+ io->ci_obj = cl_object_top(osc2cl(osc));
+ io->ci_ignore_layout = 1;
+ result = cl_io_init(env, io, CIT_MISC, io->ci_obj);
+ if (result != 0)
+ GOTO(out, result);
+
+ cb = mode == CLM_READ ? check_and_discard_cb : discard_cb;
+ info->oti_fn_index = info->oti_next_index = start;
+ do {
+ res = osc_page_gang_lookup(env, io, osc,
+ info->oti_next_index, end, cb, osc);
+ if (info->oti_next_index > end)
+ break;
+
+ if (res == CLP_GANG_RESCHED)
+ cond_resched();
+ } while (res != CLP_GANG_OKAY);
+out:
+ cl_io_fini(env, io);
+ RETURN(result);
}
+
/** @} osc */
git://git.whamcloud.com / fs / lustre-release.git / blobdiff