X-Git-Url: https://gerrit.opnfv.org/gerrit/gitweb?a=blobdiff_plain;f=kernel%2Fdrivers%2Fstaging%2Flustre%2Flustre%2Flov%2Flov_object.c;fp=kernel%2Fdrivers%2Fstaging%2Flustre%2Flustre%2Flov%2Flov_object.c;h=a22342fa792d010d12f8fea811c9d05a44b41639;hb=9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00;hp=0000000000000000000000000000000000000000;hpb=98260f3884f4a202f9ca5eabed40b1354c489b29;p=kvmfornfv.git diff --git a/kernel/drivers/staging/lustre/lustre/lov/lov_object.c b/kernel/drivers/staging/lustre/lustre/lov/lov_object.c new file mode 100644 index 000000000..a22342fa7 --- /dev/null +++ b/kernel/drivers/staging/lustre/lustre/lov/lov_object.c @@ -0,0 +1,1001 @@ +/* + * 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 + * Author: Jinshan Xiong + */ + +#define DEBUG_SUBSYSTEM S_LOV + +#include "lov_cl_internal.h" +#include "../include/lclient.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; + + 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); + + 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); + + /* reuse ->coh_attr_guard to protect coh_parent change */ + spin_lock(&subhdr->coh_attr_guard); + parent = subhdr->coh_parent; + if (parent == NULL) { + subhdr->coh_parent = hdr; + spin_unlock(&subhdr->coh_attr_guard); + 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; + + spin_unlock(&subhdr->coh_attr_guard); + 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 = <i->lti_stripe_conf; + struct lov_stripe_md *lsm = conf->u.coc_md->lsm; + struct lu_fid *ofid = <i->lti_fid; + struct lov_layout_raid0 *r0 = &state->raid0; + + 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; + + if (lov_oinfo_is_dummy(oinfo)) + continue; + + result = ostid_to_fid(ofid, &oinfo->loi_oi, + oinfo->loi_ost_idx); + if (result != 0) + goto out; + + 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_init_released(const struct lu_env *env, + struct lov_device *dev, struct lov_object *lov, + const struct cl_object_conf *conf, + union lov_layout_state *state) +{ + struct lov_stripe_md *lsm = conf->u.coc_md->lsm; + + LASSERT(lsm != NULL); + LASSERT(lsm_is_released(lsm)); + LASSERT(lov->lo_lsm == NULL); + + lov->lo_lsm = lsm_addref(lsm); + return 0; +} + +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->lo_type == LLT_RELEASED); + + 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(waiter, current); + 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); + schedule(); + } 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; + + 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 || lov->lo_type == LLT_RELEASED); +} + +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; + + 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); +} + +static void lov_fini_released(const struct lu_env *env, struct lov_object *lov, + union lov_layout_state *state) +{ + dump_lsm(D_INODE, lov->lo_lsm); + lov_free_memmd(&lov->lo_lsm); +} + +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, %s, lsm{%p 0x%08X %d %u %u}:\n", + r0->lo_nr, lov->lo_layout_invalid ? "invalid" : "valid", 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; +} + +static int lov_print_released(const struct lu_env *env, void *cookie, + lu_printer_t p, const struct lu_object *o) +{ + struct lov_object *lov = lu2lov(o); + struct lov_stripe_md *lsm = lov->lo_lsm; + + (*p)(env, cookie, + "released: %s, lsm{%p 0x%08X %d %u %u}:\n", + lov->lo_layout_invalid ? "invalid" : "valid", lsm, + lsm->lsm_magic, atomic_read(&lsm->lsm_refc), + lsm->lsm_stripe_count, lsm->lsm_layout_gen); + 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; + + /* 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; +} + +static const 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 + }, + [LLT_RELEASED] = { + .llo_init = lov_init_released, + .llo_delete = lov_delete_empty, + .llo_fini = lov_fini_released, + .llo_install = lov_install_empty, + .llo_print = lov_print_released, + .llo_page_init = lov_page_init_empty, + .llo_lock_init = lov_lock_init_empty, + .llo_io_init = lov_io_init_released, + .llo_getattr = lov_attr_get_empty + } +}; + +/** + * 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__); \ +}) + +/** + * Return lov_layout_type associated with a given lsm + */ +static enum lov_layout_type lov_type(struct lov_stripe_md *lsm) +{ + if (lsm == NULL) + return LLT_EMPTY; + if (lsm_is_released(lsm)) + return LLT_RELEASED; + return LLT_RAID0; +} + +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 }; + + 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; + + LASSERT(0 <= lov->lo_type && lov->lo_type < ARRAY_SIZE(lov_dispatch)); + + if (conf->u.coc_md != NULL) + llt = lov_type(conf->u.coc_md->lsm); + 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); + } + + CDEBUG(D_INODE, DFID" from %s to %s\n", + PFID(lu_object_fid(lov2lu(lov))), + llt2str(lov->lo_type), llt2str(llt)); + + 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; + + 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 = lov_type(cconf->u.coc_md->lsm); + 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; + + lov_conf_lock(lov); + if (conf->coc_opc == OBJECT_CONF_INVALIDATE) { + lov->lo_layout_invalid = true; + result = 0; + goto out; + } + + 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; + } + + 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) && + (lov->lo_lsm->lsm_pattern == lsm->lsm_pattern))) { + /* same version of layout */ + lov->lo_layout_invalid = false; + result = 0; + goto out; + } + + /* will change layout - check if there still exists active IO. */ + if (atomic_read(&lov->lo_active_ios) > 0) { + lov->lo_layout_invalid = true; + result = -EBUSY; + goto out; + } + + lov->lo_layout_invalid = lov_layout_change(env, lov, conf); + +out: + lov_conf_unlock(lov); + CDEBUG(D_INODE, DFID" lo_layout_invalid=%d\n", + PFID(lu_object_fid(lov2lu(lov))), lov->lo_layout_invalid); + return result; +} + +static void lov_object_delete(const struct lu_env *env, struct lu_object *obj) +{ + struct lov_object *lov = lu2lov(obj); + + LOV_2DISPATCH_VOID(lov, llo_delete, env, lov, &lov->u); +} + +static void lov_object_free(const struct lu_env *env, struct lu_object *obj) +{ + struct lov_object *lov = lu2lov(obj); + + LOV_2DISPATCH_VOID(lov, llo_fini, env, lov, &lov->u); + lu_object_fini(obj); + OBD_SLAB_FREE_PTR(lov, lov_object_kmem); +} + +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; + + OBD_SLAB_ALLOC_PTR_GFP(lov, lov_object_kmem, GFP_NOFS); + 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; + + 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 (lov_oinfo_is_dummy(loi)) + continue; + + if (loi->loi_ar.ar_rc && !rc) + rc = loi->loi_ar.ar_rc; + loi->loi_ar.ar_rc = 0; + } + } + case LLT_RELEASED: + case LLT_EMPTY: + break; + default: + LBUG(); + } + lov_conf_thaw(lov); + } + return rc; +} +EXPORT_SYMBOL(lov_read_and_clear_async_rc); + +/** @} lov */