aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/staging/lustre/lustre/lov/lov_object.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/staging/lustre/lustre/lov/lov_object.c')
-rw-r--r--drivers/staging/lustre/lustre/lov/lov_object.c942
1 files changed, 942 insertions, 0 deletions
diff --git a/drivers/staging/lustre/lustre/lov/lov_object.c b/drivers/staging/lustre/lustre/lov/lov_object.c
new file mode 100644
index 000000000000..aa8ae80e8121
--- /dev/null
+++ b/drivers/staging/lustre/lustre/lov/lov_object.c
@@ -0,0 +1,942 @@
+/*
+ * GPL HEADER START
+ *
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 only,
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License version 2 for more details (a copy is included
+ * in the LICENSE file that accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License
+ * version 2 along with this program; If not, see
+ * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ * GPL HEADER END
+ */
+/*
+ * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Use is subject to license terms.
+ *
+ * Copyright (c) 2011, 2012, Intel Corporation.
+ */
+/*
+ * This file is part of Lustre, http://www.lustre.org/
+ * Lustre is a trademark of Sun Microsystems, Inc.
+ *
+ * Implementation of cl_object for LOV layer.
+ *
+ * Author: Nikita Danilov <nikita.danilov@sun.com>
+ * Author: Jinshan Xiong <jinshan.xiong@whamcloud.com>
+ */
+
+#define DEBUG_SUBSYSTEM S_LOV
+
+#include "lov_cl_internal.h"
+#include <lustre_debug.h>
+
+/** \addtogroup lov
+ * @{
+ */
+
+/*****************************************************************************
+ *
+ * Layout operations.
+ *
+ */
+
+struct lov_layout_operations {
+ int (*llo_init)(const struct lu_env *env, struct lov_device *dev,
+ struct lov_object *lov,
+ const struct cl_object_conf *conf,
+ union lov_layout_state *state);
+ int (*llo_delete)(const struct lu_env *env, struct lov_object *lov,
+ union lov_layout_state *state);
+ void (*llo_fini)(const struct lu_env *env, struct lov_object *lov,
+ union lov_layout_state *state);
+ void (*llo_install)(const struct lu_env *env, struct lov_object *lov,
+ union lov_layout_state *state);
+ int (*llo_print)(const struct lu_env *env, void *cookie,
+ lu_printer_t p, const struct lu_object *o);
+ int (*llo_page_init)(const struct lu_env *env, struct cl_object *obj,
+ struct cl_page *page, struct page *vmpage);
+ int (*llo_lock_init)(const struct lu_env *env,
+ struct cl_object *obj, struct cl_lock *lock,
+ const struct cl_io *io);
+ int (*llo_io_init)(const struct lu_env *env,
+ struct cl_object *obj, struct cl_io *io);
+ int (*llo_getattr)(const struct lu_env *env, struct cl_object *obj,
+ struct cl_attr *attr);
+};
+
+static int lov_layout_wait(const struct lu_env *env, struct lov_object *lov);
+
+/*****************************************************************************
+ *
+ * Lov object layout operations.
+ *
+ */
+
+static void lov_install_empty(const struct lu_env *env,
+ struct lov_object *lov,
+ union lov_layout_state *state)
+{
+ /*
+ * File without objects.
+ */
+}
+
+static int lov_init_empty(const struct lu_env *env,
+ struct lov_device *dev, struct lov_object *lov,
+ const struct cl_object_conf *conf,
+ union lov_layout_state *state)
+{
+ return 0;
+}
+
+static void lov_install_raid0(const struct lu_env *env,
+ struct lov_object *lov,
+ union lov_layout_state *state)
+{
+}
+
+static struct cl_object *lov_sub_find(const struct lu_env *env,
+ struct cl_device *dev,
+ const struct lu_fid *fid,
+ const struct cl_object_conf *conf)
+{
+ struct lu_object *o;
+
+ ENTRY;
+ o = lu_object_find_at(env, cl2lu_dev(dev), fid, &conf->coc_lu);
+ LASSERT(ergo(!IS_ERR(o), o->lo_dev->ld_type == &lovsub_device_type));
+ RETURN(lu2cl(o));
+}
+
+static int lov_init_sub(const struct lu_env *env, struct lov_object *lov,
+ struct cl_object *stripe,
+ struct lov_layout_raid0 *r0, int idx)
+{
+ struct cl_object_header *hdr;
+ struct cl_object_header *subhdr;
+ struct cl_object_header *parent;
+ struct lov_oinfo *oinfo;
+ int result;
+
+ if (OBD_FAIL_CHECK(OBD_FAIL_LOV_INIT)) {
+ /* For sanity:test_206.
+ * Do not leave the object in cache to avoid accessing
+ * freed memory. This is because osc_object is referring to
+ * lov_oinfo of lsm_stripe_data which will be freed due to
+ * this failure. */
+ cl_object_kill(env, stripe);
+ cl_object_put(env, stripe);
+ return -EIO;
+ }
+
+ hdr = cl_object_header(lov2cl(lov));
+ subhdr = cl_object_header(stripe);
+ parent = subhdr->coh_parent;
+
+ oinfo = lov->lo_lsm->lsm_oinfo[idx];
+ CDEBUG(D_INODE, DFID"@%p[%d] -> "DFID"@%p: ostid: "DOSTID
+ " idx: %d gen: %d\n",
+ PFID(&subhdr->coh_lu.loh_fid), subhdr, idx,
+ PFID(&hdr->coh_lu.loh_fid), hdr, POSTID(&oinfo->loi_oi),
+ oinfo->loi_ost_idx, oinfo->loi_ost_gen);
+
+ if (parent == NULL) {
+ subhdr->coh_parent = hdr;
+ subhdr->coh_nesting = hdr->coh_nesting + 1;
+ lu_object_ref_add(&stripe->co_lu, "lov-parent", lov);
+ r0->lo_sub[idx] = cl2lovsub(stripe);
+ r0->lo_sub[idx]->lso_super = lov;
+ r0->lo_sub[idx]->lso_index = idx;
+ result = 0;
+ } else {
+ struct lu_object *old_obj;
+ struct lov_object *old_lov;
+ unsigned int mask = D_INODE;
+
+ old_obj = lu_object_locate(&parent->coh_lu, &lov_device_type);
+ LASSERT(old_obj != NULL);
+ old_lov = cl2lov(lu2cl(old_obj));
+ if (old_lov->lo_layout_invalid) {
+ /* the object's layout has already changed but isn't
+ * refreshed */
+ lu_object_unhash(env, &stripe->co_lu);
+ result = -EAGAIN;
+ } else {
+ mask = D_ERROR;
+ result = -EIO;
+ }
+
+ LU_OBJECT_DEBUG(mask, env, &stripe->co_lu,
+ "stripe %d is already owned.\n", idx);
+ LU_OBJECT_DEBUG(mask, env, old_obj, "owned.\n");
+ LU_OBJECT_HEADER(mask, env, lov2lu(lov), "try to own.\n");
+ cl_object_put(env, stripe);
+ }
+ return result;
+}
+
+static int lov_init_raid0(const struct lu_env *env,
+ struct lov_device *dev, struct lov_object *lov,
+ const struct cl_object_conf *conf,
+ union lov_layout_state *state)
+{
+ int result;
+ int i;
+
+ struct cl_object *stripe;
+ struct lov_thread_info *lti = lov_env_info(env);
+ struct cl_object_conf *subconf = &lti->lti_stripe_conf;
+ struct lov_stripe_md *lsm = conf->u.coc_md->lsm;
+ struct lu_fid *ofid = &lti->lti_fid;
+ struct lov_layout_raid0 *r0 = &state->raid0;
+
+ ENTRY;
+
+ if (lsm->lsm_magic != LOV_MAGIC_V1 && lsm->lsm_magic != LOV_MAGIC_V3) {
+ dump_lsm(D_ERROR, lsm);
+ LASSERTF(0, "magic mismatch, expected %d/%d, actual %d.\n",
+ LOV_MAGIC_V1, LOV_MAGIC_V3, lsm->lsm_magic);
+ }
+
+ LASSERT(lov->lo_lsm == NULL);
+ lov->lo_lsm = lsm_addref(lsm);
+ r0->lo_nr = lsm->lsm_stripe_count;
+ LASSERT(r0->lo_nr <= lov_targets_nr(dev));
+
+ OBD_ALLOC_LARGE(r0->lo_sub, r0->lo_nr * sizeof r0->lo_sub[0]);
+ if (r0->lo_sub != NULL) {
+ result = 0;
+ subconf->coc_inode = conf->coc_inode;
+ spin_lock_init(&r0->lo_sub_lock);
+ /*
+ * Create stripe cl_objects.
+ */
+ for (i = 0; i < r0->lo_nr && result == 0; ++i) {
+ struct cl_device *subdev;
+ struct lov_oinfo *oinfo = lsm->lsm_oinfo[i];
+ int ost_idx = oinfo->loi_ost_idx;
+
+ result = ostid_to_fid(ofid, &oinfo->loi_oi,
+ oinfo->loi_ost_idx);
+ if (result != 0)
+ GOTO(out, result);
+
+ subdev = lovsub2cl_dev(dev->ld_target[ost_idx]);
+ subconf->u.coc_oinfo = oinfo;
+ LASSERTF(subdev != NULL, "not init ost %d\n", ost_idx);
+ /* In the function below, .hs_keycmp resolves to
+ * lu_obj_hop_keycmp() */
+ /* coverity[overrun-buffer-val] */
+ stripe = lov_sub_find(env, subdev, ofid, subconf);
+ if (!IS_ERR(stripe)) {
+ result = lov_init_sub(env, lov, stripe, r0, i);
+ if (result == -EAGAIN) { /* try again */
+ --i;
+ result = 0;
+ }
+ } else {
+ result = PTR_ERR(stripe);
+ }
+ }
+ } else
+ result = -ENOMEM;
+out:
+ RETURN(result);
+}
+
+static int lov_delete_empty(const struct lu_env *env, struct lov_object *lov,
+ union lov_layout_state *state)
+{
+ LASSERT(lov->lo_type == LLT_EMPTY);
+
+ lov_layout_wait(env, lov);
+
+ cl_object_prune(env, &lov->lo_cl);
+ return 0;
+}
+
+static void lov_subobject_kill(const struct lu_env *env, struct lov_object *lov,
+ struct lovsub_object *los, int idx)
+{
+ struct cl_object *sub;
+ struct lov_layout_raid0 *r0;
+ struct lu_site *site;
+ struct lu_site_bkt_data *bkt;
+ wait_queue_t *waiter;
+
+ r0 = &lov->u.raid0;
+ LASSERT(r0->lo_sub[idx] == los);
+
+ sub = lovsub2cl(los);
+ site = sub->co_lu.lo_dev->ld_site;
+ bkt = lu_site_bkt_from_fid(site, &sub->co_lu.lo_header->loh_fid);
+
+ cl_object_kill(env, sub);
+ /* release a reference to the sub-object and ... */
+ lu_object_ref_del(&sub->co_lu, "lov-parent", lov);
+ cl_object_put(env, sub);
+
+ /* ... wait until it is actually destroyed---sub-object clears its
+ * ->lo_sub[] slot in lovsub_object_fini() */
+ if (r0->lo_sub[idx] == los) {
+ waiter = &lov_env_info(env)->lti_waiter;
+ init_waitqueue_entry_current(waiter);
+ add_wait_queue(&bkt->lsb_marche_funebre, waiter);
+ set_current_state(TASK_UNINTERRUPTIBLE);
+ while (1) {
+ /* this wait-queue is signaled at the end of
+ * lu_object_free(). */
+ set_current_state(TASK_UNINTERRUPTIBLE);
+ spin_lock(&r0->lo_sub_lock);
+ if (r0->lo_sub[idx] == los) {
+ spin_unlock(&r0->lo_sub_lock);
+ waitq_wait(waiter, TASK_UNINTERRUPTIBLE);
+ } else {
+ spin_unlock(&r0->lo_sub_lock);
+ set_current_state(TASK_RUNNING);
+ break;
+ }
+ }
+ remove_wait_queue(&bkt->lsb_marche_funebre, waiter);
+ }
+ LASSERT(r0->lo_sub[idx] == NULL);
+}
+
+static int lov_delete_raid0(const struct lu_env *env, struct lov_object *lov,
+ union lov_layout_state *state)
+{
+ struct lov_layout_raid0 *r0 = &state->raid0;
+ struct lov_stripe_md *lsm = lov->lo_lsm;
+ int i;
+
+ ENTRY;
+
+ dump_lsm(D_INODE, lsm);
+
+ lov_layout_wait(env, lov);
+ if (r0->lo_sub != NULL) {
+ for (i = 0; i < r0->lo_nr; ++i) {
+ struct lovsub_object *los = r0->lo_sub[i];
+
+ if (los != NULL) {
+ cl_locks_prune(env, &los->lso_cl, 1);
+ /*
+ * If top-level object is to be evicted from
+ * the cache, so are its sub-objects.
+ */
+ lov_subobject_kill(env, lov, los, i);
+ }
+ }
+ }
+ cl_object_prune(env, &lov->lo_cl);
+ RETURN(0);
+}
+
+static void lov_fini_empty(const struct lu_env *env, struct lov_object *lov,
+ union lov_layout_state *state)
+{
+ LASSERT(lov->lo_type == LLT_EMPTY);
+}
+
+static void lov_fini_raid0(const struct lu_env *env, struct lov_object *lov,
+ union lov_layout_state *state)
+{
+ struct lov_layout_raid0 *r0 = &state->raid0;
+ ENTRY;
+
+ if (r0->lo_sub != NULL) {
+ OBD_FREE_LARGE(r0->lo_sub, r0->lo_nr * sizeof r0->lo_sub[0]);
+ r0->lo_sub = NULL;
+ }
+
+ dump_lsm(D_INODE, lov->lo_lsm);
+ lov_free_memmd(&lov->lo_lsm);
+
+ EXIT;
+}
+
+static int lov_print_empty(const struct lu_env *env, void *cookie,
+ lu_printer_t p, const struct lu_object *o)
+{
+ (*p)(env, cookie, "empty %d\n", lu2lov(o)->lo_layout_invalid);
+ return 0;
+}
+
+static int lov_print_raid0(const struct lu_env *env, void *cookie,
+ lu_printer_t p, const struct lu_object *o)
+{
+ struct lov_object *lov = lu2lov(o);
+ struct lov_layout_raid0 *r0 = lov_r0(lov);
+ struct lov_stripe_md *lsm = lov->lo_lsm;
+ int i;
+
+ (*p)(env, cookie, "stripes: %d, %svalid, lsm{%p 0x%08X %d %u %u}: \n",
+ r0->lo_nr, lov->lo_layout_invalid ? "in" : "", lsm,
+ lsm->lsm_magic, atomic_read(&lsm->lsm_refc),
+ lsm->lsm_stripe_count, lsm->lsm_layout_gen);
+ for (i = 0; i < r0->lo_nr; ++i) {
+ struct lu_object *sub;
+
+ if (r0->lo_sub[i] != NULL) {
+ sub = lovsub2lu(r0->lo_sub[i]);
+ lu_object_print(env, cookie, p, sub);
+ } else
+ (*p)(env, cookie, "sub %d absent\n", i);
+ }
+ return 0;
+}
+
+/**
+ * Implements cl_object_operations::coo_attr_get() method for an object
+ * without stripes (LLT_EMPTY layout type).
+ *
+ * The only attributes this layer is authoritative in this case is
+ * cl_attr::cat_blocks---it's 0.
+ */
+static int lov_attr_get_empty(const struct lu_env *env, struct cl_object *obj,
+ struct cl_attr *attr)
+{
+ attr->cat_blocks = 0;
+ return 0;
+}
+
+static int lov_attr_get_raid0(const struct lu_env *env, struct cl_object *obj,
+ struct cl_attr *attr)
+{
+ struct lov_object *lov = cl2lov(obj);
+ struct lov_layout_raid0 *r0 = lov_r0(lov);
+ struct cl_attr *lov_attr = &r0->lo_attr;
+ int result = 0;
+
+ ENTRY;
+
+ /* this is called w/o holding type guard mutex, so it must be inside
+ * an on going IO otherwise lsm may be replaced.
+ * LU-2117: it turns out there exists one exception. For mmaped files,
+ * the lock of those files may be requested in the other file's IO
+ * context, and this function is called in ccc_lock_state(), it will
+ * hit this assertion.
+ * Anyway, it's still okay to call attr_get w/o type guard as layout
+ * can't go if locks exist. */
+ /* LASSERT(atomic_read(&lsm->lsm_refc) > 1); */
+
+ if (!r0->lo_attr_valid) {
+ struct lov_stripe_md *lsm = lov->lo_lsm;
+ struct ost_lvb *lvb = &lov_env_info(env)->lti_lvb;
+ __u64 kms = 0;
+
+ memset(lvb, 0, sizeof(*lvb));
+ /* XXX: timestamps can be negative by sanity:test_39m,
+ * how can it be? */
+ lvb->lvb_atime = LLONG_MIN;
+ lvb->lvb_ctime = LLONG_MIN;
+ lvb->lvb_mtime = LLONG_MIN;
+
+ /*
+ * XXX that should be replaced with a loop over sub-objects,
+ * doing cl_object_attr_get() on them. But for now, let's
+ * reuse old lov code.
+ */
+
+ /*
+ * XXX take lsm spin-lock to keep lov_merge_lvb_kms()
+ * happy. It's not needed, because new code uses
+ * ->coh_attr_guard spin-lock to protect consistency of
+ * sub-object attributes.
+ */
+ lov_stripe_lock(lsm);
+ result = lov_merge_lvb_kms(lsm, lvb, &kms);
+ lov_stripe_unlock(lsm);
+ if (result == 0) {
+ cl_lvb2attr(lov_attr, lvb);
+ lov_attr->cat_kms = kms;
+ r0->lo_attr_valid = 1;
+ }
+ }
+ if (result == 0) { /* merge results */
+ attr->cat_blocks = lov_attr->cat_blocks;
+ attr->cat_size = lov_attr->cat_size;
+ attr->cat_kms = lov_attr->cat_kms;
+ if (attr->cat_atime < lov_attr->cat_atime)
+ attr->cat_atime = lov_attr->cat_atime;
+ if (attr->cat_ctime < lov_attr->cat_ctime)
+ attr->cat_ctime = lov_attr->cat_ctime;
+ if (attr->cat_mtime < lov_attr->cat_mtime)
+ attr->cat_mtime = lov_attr->cat_mtime;
+ }
+ RETURN(result);
+}
+
+const static struct lov_layout_operations lov_dispatch[] = {
+ [LLT_EMPTY] = {
+ .llo_init = lov_init_empty,
+ .llo_delete = lov_delete_empty,
+ .llo_fini = lov_fini_empty,
+ .llo_install = lov_install_empty,
+ .llo_print = lov_print_empty,
+ .llo_page_init = lov_page_init_empty,
+ .llo_lock_init = lov_lock_init_empty,
+ .llo_io_init = lov_io_init_empty,
+ .llo_getattr = lov_attr_get_empty
+ },
+ [LLT_RAID0] = {
+ .llo_init = lov_init_raid0,
+ .llo_delete = lov_delete_raid0,
+ .llo_fini = lov_fini_raid0,
+ .llo_install = lov_install_raid0,
+ .llo_print = lov_print_raid0,
+ .llo_page_init = lov_page_init_raid0,
+ .llo_lock_init = lov_lock_init_raid0,
+ .llo_io_init = lov_io_init_raid0,
+ .llo_getattr = lov_attr_get_raid0
+ }
+};
+
+
+/**
+ * Performs a double-dispatch based on the layout type of an object.
+ */
+#define LOV_2DISPATCH_NOLOCK(obj, op, ...) \
+({ \
+ struct lov_object *__obj = (obj); \
+ enum lov_layout_type __llt; \
+ \
+ __llt = __obj->lo_type; \
+ LASSERT(0 <= __llt && __llt < ARRAY_SIZE(lov_dispatch)); \
+ lov_dispatch[__llt].op(__VA_ARGS__); \
+})
+
+static inline void lov_conf_freeze(struct lov_object *lov)
+{
+ if (lov->lo_owner != current)
+ down_read(&lov->lo_type_guard);
+}
+
+static inline void lov_conf_thaw(struct lov_object *lov)
+{
+ if (lov->lo_owner != current)
+ up_read(&lov->lo_type_guard);
+}
+
+#define LOV_2DISPATCH_MAYLOCK(obj, op, lock, ...) \
+({ \
+ struct lov_object *__obj = (obj); \
+ int __lock = !!(lock); \
+ typeof(lov_dispatch[0].op(__VA_ARGS__)) __result; \
+ \
+ if (__lock) \
+ lov_conf_freeze(__obj); \
+ __result = LOV_2DISPATCH_NOLOCK(obj, op, __VA_ARGS__); \
+ if (__lock) \
+ lov_conf_thaw(__obj); \
+ __result; \
+})
+
+/**
+ * Performs a locked double-dispatch based on the layout type of an object.
+ */
+#define LOV_2DISPATCH(obj, op, ...) \
+ LOV_2DISPATCH_MAYLOCK(obj, op, 1, __VA_ARGS__)
+
+#define LOV_2DISPATCH_VOID(obj, op, ...) \
+do { \
+ struct lov_object *__obj = (obj); \
+ enum lov_layout_type __llt; \
+ \
+ lov_conf_freeze(__obj); \
+ __llt = __obj->lo_type; \
+ LASSERT(0 <= __llt && __llt < ARRAY_SIZE(lov_dispatch)); \
+ lov_dispatch[__llt].op(__VA_ARGS__); \
+ lov_conf_thaw(__obj); \
+} while (0)
+
+static void lov_conf_lock(struct lov_object *lov)
+{
+ LASSERT(lov->lo_owner != current);
+ down_write(&lov->lo_type_guard);
+ LASSERT(lov->lo_owner == NULL);
+ lov->lo_owner = current;
+}
+
+static void lov_conf_unlock(struct lov_object *lov)
+{
+ lov->lo_owner = NULL;
+ up_write(&lov->lo_type_guard);
+}
+
+static int lov_layout_wait(const struct lu_env *env, struct lov_object *lov)
+{
+ struct l_wait_info lwi = { 0 };
+ ENTRY;
+
+ while (atomic_read(&lov->lo_active_ios) > 0) {
+ CDEBUG(D_INODE, "file:"DFID" wait for active IO, now: %d.\n",
+ PFID(lu_object_fid(lov2lu(lov))),
+ atomic_read(&lov->lo_active_ios));
+
+ l_wait_event(lov->lo_waitq,
+ atomic_read(&lov->lo_active_ios) == 0, &lwi);
+ }
+ RETURN(0);
+}
+
+static int lov_layout_change(const struct lu_env *unused,
+ struct lov_object *lov,
+ const struct cl_object_conf *conf)
+{
+ int result;
+ enum lov_layout_type llt = LLT_EMPTY;
+ union lov_layout_state *state = &lov->u;
+ const struct lov_layout_operations *old_ops;
+ const struct lov_layout_operations *new_ops;
+
+ struct cl_object_header *hdr = cl_object_header(&lov->lo_cl);
+ void *cookie;
+ struct lu_env *env;
+ int refcheck;
+ ENTRY;
+
+ LASSERT(0 <= lov->lo_type && lov->lo_type < ARRAY_SIZE(lov_dispatch));
+
+ if (conf->u.coc_md != NULL && conf->u.coc_md->lsm != NULL)
+ llt = LLT_RAID0; /* only raid0 is supported. */
+ LASSERT(0 <= llt && llt < ARRAY_SIZE(lov_dispatch));
+
+ cookie = cl_env_reenter();
+ env = cl_env_get(&refcheck);
+ if (IS_ERR(env)) {
+ cl_env_reexit(cookie);
+ RETURN(PTR_ERR(env));
+ }
+
+ old_ops = &lov_dispatch[lov->lo_type];
+ new_ops = &lov_dispatch[llt];
+
+ result = old_ops->llo_delete(env, lov, &lov->u);
+ if (result == 0) {
+ old_ops->llo_fini(env, lov, &lov->u);
+
+ LASSERT(atomic_read(&lov->lo_active_ios) == 0);
+ LASSERT(hdr->coh_tree.rnode == NULL);
+ LASSERT(hdr->coh_pages == 0);
+
+ lov->lo_type = LLT_EMPTY;
+ result = new_ops->llo_init(env,
+ lu2lov_dev(lov->lo_cl.co_lu.lo_dev),
+ lov, conf, state);
+ if (result == 0) {
+ new_ops->llo_install(env, lov, state);
+ lov->lo_type = llt;
+ } else {
+ new_ops->llo_delete(env, lov, state);
+ new_ops->llo_fini(env, lov, state);
+ /* this file becomes an EMPTY file. */
+ }
+ }
+
+ cl_env_put(env, &refcheck);
+ cl_env_reexit(cookie);
+ RETURN(result);
+}
+
+/*****************************************************************************
+ *
+ * Lov object operations.
+ *
+ */
+
+int lov_object_init(const struct lu_env *env, struct lu_object *obj,
+ const struct lu_object_conf *conf)
+{
+ struct lov_device *dev = lu2lov_dev(obj->lo_dev);
+ struct lov_object *lov = lu2lov(obj);
+ const struct cl_object_conf *cconf = lu2cl_conf(conf);
+ union lov_layout_state *set = &lov->u;
+ const struct lov_layout_operations *ops;
+ int result;
+
+ ENTRY;
+ init_rwsem(&lov->lo_type_guard);
+ atomic_set(&lov->lo_active_ios, 0);
+ init_waitqueue_head(&lov->lo_waitq);
+
+ cl_object_page_init(lu2cl(obj), sizeof(struct lov_page));
+
+ /* no locking is necessary, as object is being created */
+ lov->lo_type = cconf->u.coc_md->lsm != NULL ? LLT_RAID0 : LLT_EMPTY;
+ ops = &lov_dispatch[lov->lo_type];
+ result = ops->llo_init(env, dev, lov, cconf, set);
+ if (result == 0)
+ ops->llo_install(env, lov, set);
+ RETURN(result);
+}
+
+static int lov_conf_set(const struct lu_env *env, struct cl_object *obj,
+ const struct cl_object_conf *conf)
+{
+ struct lov_stripe_md *lsm = NULL;
+ struct lov_object *lov = cl2lov(obj);
+ int result = 0;
+ ENTRY;
+
+ lov_conf_lock(lov);
+ if (conf->coc_opc == OBJECT_CONF_INVALIDATE) {
+ lov->lo_layout_invalid = true;
+ GOTO(out, result = 0);
+ }
+
+ if (conf->coc_opc == OBJECT_CONF_WAIT) {
+ if (lov->lo_layout_invalid &&
+ atomic_read(&lov->lo_active_ios) > 0) {
+ lov_conf_unlock(lov);
+ result = lov_layout_wait(env, lov);
+ lov_conf_lock(lov);
+ }
+ GOTO(out, result);
+ }
+
+ LASSERT(conf->coc_opc == OBJECT_CONF_SET);
+
+ if (conf->u.coc_md != NULL)
+ lsm = conf->u.coc_md->lsm;
+ if ((lsm == NULL && lov->lo_lsm == NULL) ||
+ (lsm != NULL && lov->lo_lsm != NULL &&
+ lov->lo_lsm->lsm_layout_gen == lsm->lsm_layout_gen)) {
+ /* same version of layout */
+ lov->lo_layout_invalid = false;
+ GOTO(out, result = 0);
+ }
+
+ /* will change layout - check if there still exists active IO. */
+ if (atomic_read(&lov->lo_active_ios) > 0) {
+ lov->lo_layout_invalid = true;
+ GOTO(out, result = -EBUSY);
+ }
+
+ lov->lo_layout_invalid = lov_layout_change(env, lov, conf);
+ EXIT;
+
+out:
+ lov_conf_unlock(lov);
+ RETURN(result);
+}
+
+static void lov_object_delete(const struct lu_env *env, struct lu_object *obj)
+{
+ struct lov_object *lov = lu2lov(obj);
+
+ ENTRY;
+ LOV_2DISPATCH_VOID(lov, llo_delete, env, lov, &lov->u);
+ EXIT;
+}
+
+static void lov_object_free(const struct lu_env *env, struct lu_object *obj)
+{
+ struct lov_object *lov = lu2lov(obj);
+
+ ENTRY;
+ LOV_2DISPATCH_VOID(lov, llo_fini, env, lov, &lov->u);
+ lu_object_fini(obj);
+ OBD_SLAB_FREE_PTR(lov, lov_object_kmem);
+ EXIT;
+}
+
+static int lov_object_print(const struct lu_env *env, void *cookie,
+ lu_printer_t p, const struct lu_object *o)
+{
+ return LOV_2DISPATCH_NOLOCK(lu2lov(o), llo_print, env, cookie, p, o);
+}
+
+int lov_page_init(const struct lu_env *env, struct cl_object *obj,
+ struct cl_page *page, struct page *vmpage)
+{
+ return LOV_2DISPATCH_NOLOCK(cl2lov(obj),
+ llo_page_init, env, obj, page, vmpage);
+}
+
+/**
+ * Implements cl_object_operations::clo_io_init() method for lov
+ * layer. Dispatches to the appropriate layout io initialization method.
+ */
+int lov_io_init(const struct lu_env *env, struct cl_object *obj,
+ struct cl_io *io)
+{
+ CL_IO_SLICE_CLEAN(lov_env_io(env), lis_cl);
+ return LOV_2DISPATCH_MAYLOCK(cl2lov(obj), llo_io_init,
+ !io->ci_ignore_layout, env, obj, io);
+}
+
+/**
+ * An implementation of cl_object_operations::clo_attr_get() method for lov
+ * layer. For raid0 layout this collects and merges attributes of all
+ * sub-objects.
+ */
+static int lov_attr_get(const struct lu_env *env, struct cl_object *obj,
+ struct cl_attr *attr)
+{
+ /* do not take lock, as this function is called under a
+ * spin-lock. Layout is protected from changing by ongoing IO. */
+ return LOV_2DISPATCH_NOLOCK(cl2lov(obj), llo_getattr, env, obj, attr);
+}
+
+static int lov_attr_set(const struct lu_env *env, struct cl_object *obj,
+ const struct cl_attr *attr, unsigned valid)
+{
+ /*
+ * No dispatch is required here, as no layout implements this.
+ */
+ return 0;
+}
+
+int lov_lock_init(const struct lu_env *env, struct cl_object *obj,
+ struct cl_lock *lock, const struct cl_io *io)
+{
+ /* No need to lock because we've taken one refcount of layout. */
+ return LOV_2DISPATCH_NOLOCK(cl2lov(obj), llo_lock_init, env, obj, lock,
+ io);
+}
+
+static const struct cl_object_operations lov_ops = {
+ .coo_page_init = lov_page_init,
+ .coo_lock_init = lov_lock_init,
+ .coo_io_init = lov_io_init,
+ .coo_attr_get = lov_attr_get,
+ .coo_attr_set = lov_attr_set,
+ .coo_conf_set = lov_conf_set
+};
+
+static const struct lu_object_operations lov_lu_obj_ops = {
+ .loo_object_init = lov_object_init,
+ .loo_object_delete = lov_object_delete,
+ .loo_object_release = NULL,
+ .loo_object_free = lov_object_free,
+ .loo_object_print = lov_object_print,
+ .loo_object_invariant = NULL
+};
+
+struct lu_object *lov_object_alloc(const struct lu_env *env,
+ const struct lu_object_header *unused,
+ struct lu_device *dev)
+{
+ struct lov_object *lov;
+ struct lu_object *obj;
+
+ ENTRY;
+ OBD_SLAB_ALLOC_PTR_GFP(lov, lov_object_kmem, __GFP_IO);
+ if (lov != NULL) {
+ obj = lov2lu(lov);
+ lu_object_init(obj, NULL, dev);
+ lov->lo_cl.co_ops = &lov_ops;
+ lov->lo_type = -1; /* invalid, to catch uninitialized type */
+ /*
+ * object io operation vector (cl_object::co_iop) is installed
+ * later in lov_object_init(), as different vectors are used
+ * for object with different layouts.
+ */
+ obj->lo_ops = &lov_lu_obj_ops;
+ } else
+ obj = NULL;
+ RETURN(obj);
+}
+
+struct lov_stripe_md *lov_lsm_addref(struct lov_object *lov)
+{
+ struct lov_stripe_md *lsm = NULL;
+
+ lov_conf_freeze(lov);
+ if (lov->lo_lsm != NULL) {
+ lsm = lsm_addref(lov->lo_lsm);
+ CDEBUG(D_INODE, "lsm %p addref %d/%d by %p.\n",
+ lsm, atomic_read(&lsm->lsm_refc),
+ lov->lo_layout_invalid, current);
+ }
+ lov_conf_thaw(lov);
+ return lsm;
+}
+
+void lov_lsm_decref(struct lov_object *lov, struct lov_stripe_md *lsm)
+{
+ if (lsm == NULL)
+ return;
+
+ CDEBUG(D_INODE, "lsm %p decref %d by %p.\n",
+ lsm, atomic_read(&lsm->lsm_refc), current);
+
+ lov_free_memmd(&lsm);
+}
+
+struct lov_stripe_md *lov_lsm_get(struct cl_object *clobj)
+{
+ struct lu_object *luobj;
+ struct lov_stripe_md *lsm = NULL;
+
+ if (clobj == NULL)
+ return NULL;
+
+ luobj = lu_object_locate(&cl_object_header(clobj)->coh_lu,
+ &lov_device_type);
+ if (luobj != NULL)
+ lsm = lov_lsm_addref(lu2lov(luobj));
+ return lsm;
+}
+EXPORT_SYMBOL(lov_lsm_get);
+
+void lov_lsm_put(struct cl_object *unused, struct lov_stripe_md *lsm)
+{
+ if (lsm != NULL)
+ lov_free_memmd(&lsm);
+}
+EXPORT_SYMBOL(lov_lsm_put);
+
+int lov_read_and_clear_async_rc(struct cl_object *clob)
+{
+ struct lu_object *luobj;
+ int rc = 0;
+ ENTRY;
+
+ luobj = lu_object_locate(&cl_object_header(clob)->coh_lu,
+ &lov_device_type);
+ if (luobj != NULL) {
+ struct lov_object *lov = lu2lov(luobj);
+
+ lov_conf_freeze(lov);
+ switch (lov->lo_type) {
+ case LLT_RAID0: {
+ struct lov_stripe_md *lsm;
+ int i;
+
+ lsm = lov->lo_lsm;
+ LASSERT(lsm != NULL);
+ for (i = 0; i < lsm->lsm_stripe_count; i++) {
+ struct lov_oinfo *loi = lsm->lsm_oinfo[i];
+ if (loi->loi_ar.ar_rc && !rc)
+ rc = loi->loi_ar.ar_rc;
+ loi->loi_ar.ar_rc = 0;
+ }
+ }
+ case LLT_EMPTY:
+ break;
+ default:
+ LBUG();
+ }
+ lov_conf_thaw(lov);
+ }
+ RETURN(rc);
+}
+EXPORT_SYMBOL(lov_read_and_clear_async_rc);
+
+/** @} lov */
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.