diff options
Diffstat (limited to 'drivers/staging/lustre/lustre/lov/lov_object.c')
| -rw-r--r-- | drivers/staging/lustre/lustre/lov/lov_object.c | 1625 |
1 files changed, 0 insertions, 1625 deletions
diff --git a/drivers/staging/lustre/lustre/lov/lov_object.c b/drivers/staging/lustre/lustre/lov/lov_object.c deleted file mode 100644 index adc90f310fd7..000000000000 --- a/drivers/staging/lustre/lustre/lov/lov_object.c +++ /dev/null @@ -1,1625 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * 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.gnu.org/licenses/gpl-2.0.html - * - * GPL HEADER END - */ -/* - * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved. - * Use is subject to license terms. - * - * Copyright (c) 2011, 2015, 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" - -static inline struct lov_device *lov_object_dev(struct lov_object *obj) -{ - return lu2lov_dev(obj->lo_cl.co_lu.lo_dev); -} - -/** \addtogroup lov - * @{ - */ - -/***************************************************************************** - * - * Layout operations. - * - */ - -struct lov_layout_operations { - int (*llo_init)(const struct lu_env *env, struct lov_device *dev, - struct lov_object *lov, struct lov_stripe_md *lsm, - 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, pgoff_t index); - 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); - -static void lov_lsm_put(struct lov_stripe_md *lsm) -{ - if (lsm) - lov_free_memmd(&lsm); -} - -/***************************************************************************** - * - * 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, struct lov_stripe_md *lsm, - 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) { - 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); - 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.", idx); - LU_OBJECT_DEBUG(mask, env, old_obj, "owned."); - LU_OBJECT_HEADER(mask, env, lov2lu(lov), "try to own.\n"); - cl_object_put(env, stripe); - } - return result; -} - -static int lov_page_slice_fixup(struct lov_object *lov, - struct cl_object *stripe) -{ - struct cl_object_header *hdr = cl_object_header(&lov->lo_cl); - struct cl_object *o; - - if (!stripe) - return hdr->coh_page_bufsize - lov->lo_cl.co_slice_off - - cfs_size_round(sizeof(struct lov_page)); - - cl_object_for_each(o, stripe) - o->co_slice_off += hdr->coh_page_bufsize; - - return cl_object_header(stripe)->coh_page_bufsize; -} - -static int lov_init_raid0(const struct lu_env *env, struct lov_device *dev, - struct lov_object *lov, struct lov_stripe_md *lsm, - 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 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); - lov->lo_lsm = lsm_addref(lsm); - lov->lo_layout_invalid = true; - r0->lo_nr = lsm->lsm_stripe_count; - LASSERT(r0->lo_nr <= lov_targets_nr(dev)); - - r0->lo_sub = kvzalloc(r0->lo_nr * sizeof(r0->lo_sub[0]), - GFP_NOFS); - if (r0->lo_sub) { - int psz = 0; - - 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; - - if (!dev->ld_target[ost_idx]) { - CERROR("%s: OST %04x is not initialized\n", - lov2obd(dev->ld_lov)->obd_name, ost_idx); - result = -EIO; - goto out; - } - - subdev = lovsub2cl_dev(dev->ld_target[ost_idx]); - subconf->u.coc_oinfo = oinfo; - LASSERTF(subdev, "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; - continue; - } - } else { - result = PTR_ERR(stripe); - } - - if (result == 0) { - int sz = lov_page_slice_fixup(lov, stripe); - - LASSERT(ergo(psz > 0, psz == sz)); - psz = sz; - } - } - if (result == 0) - cl_object_header(&lov->lo_cl)->coh_page_bufsize += psz; - } else { - result = -ENOMEM; - } -out: - return result; -} - -static int lov_init_released(const struct lu_env *env, struct lov_device *dev, - struct lov_object *lov, struct lov_stripe_md *lsm, - const struct cl_object_conf *conf, - union lov_layout_state *state) -{ - LASSERT(lsm); - LASSERT(lsm_is_released(lsm)); - LASSERT(!lov->lo_lsm); - - lov->lo_lsm = lsm_addref(lsm); - return 0; -} - -static struct cl_object *lov_find_subobj(const struct lu_env *env, - struct lov_object *lov, - struct lov_stripe_md *lsm, - int stripe_idx) -{ - struct lov_device *dev = lu2lov_dev(lov2lu(lov)->lo_dev); - struct lov_oinfo *oinfo = lsm->lsm_oinfo[stripe_idx]; - struct lov_thread_info *lti = lov_env_info(env); - struct lu_fid *ofid = <i->lti_fid; - struct cl_device *subdev; - struct cl_object *result; - int ost_idx; - int rc; - - if (lov->lo_type != LLT_RAID0) { - result = NULL; - goto out; - } - - ost_idx = oinfo->loi_ost_idx; - rc = ostid_to_fid(ofid, &oinfo->loi_oi, ost_idx); - if (rc) { - result = NULL; - goto out; - } - - subdev = lovsub2cl_dev(dev->ld_target[ost_idx]); - result = lov_sub_find(env, subdev, ofid, NULL); -out: - if (!result) - result = ERR_PTR(-EINVAL); - 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->lo_type == LLT_RELEASED); - - lov_layout_wait(env, lov); - 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; - wait_queue_head_t *wq; - wait_queue_entry_t *waiter; - - r0 = &lov->u.raid0; - LASSERT(r0->lo_sub[idx] == los); - - sub = lovsub2cl(los); - site = sub->co_lu.lo_dev->ld_site; - wq = lu_site_wq_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(wq, 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(wq, waiter); - } - LASSERT(!r0->lo_sub[idx]); -} - -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) { - for (i = 0; i < r0->lo_nr; ++i) { - struct lovsub_object *los = r0->lo_sub[i]; - - if (los) { - cl_object_prune(env, &los->lso_cl); - /* - * If top-level object is to be evicted from - * the cache, so are its sub-objects. - */ - lov_subobject_kill(env, lov, los, i); - } - } - } - 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) { - kvfree(r0->lo_sub); - 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]) { - 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(__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) - return LLT_EMPTY; - if (lsm_is_released(lsm)) - return LLT_RELEASED; - return LLT_RAID0; -} - -static inline void lov_conf_freeze(struct lov_object *lov) -{ - CDEBUG(D_INODE, "To take share lov(%p) owner %p/%p\n", - lov, lov->lo_owner, current); - if (lov->lo_owner != current) - down_read(&lov->lo_type_guard); -} - -static inline void lov_conf_thaw(struct lov_object *lov) -{ - CDEBUG(D_INODE, "To release share lov(%p) owner %p/%p\n", - lov, lov->lo_owner, current); - 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(__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); - lov->lo_owner = current; - CDEBUG(D_INODE, "Took exclusive lov(%p) owner %p\n", - lov, lov->lo_owner); -} - -static void lov_conf_unlock(struct lov_object *lov) -{ - CDEBUG(D_INODE, "To release exclusive lov(%p) owner %p\n", - lov, lov->lo_owner); - lov->lo_owner = NULL; - up_write(&lov->lo_type_guard); -} - -static int lov_layout_wait(const struct lu_env *env, struct lov_object *lov) -{ - 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)); - - wait_event_idle(lov->lo_waitq, - atomic_read(&lov->lo_active_ios) == 0); - } - return 0; -} - -static int lov_layout_change(const struct lu_env *unused, - struct lov_object *lov, struct lov_stripe_md *lsm, - const struct cl_object_conf *conf) -{ - struct lov_device *lov_dev = lov_object_dev(lov); - enum lov_layout_type llt = lov_type(lsm); - union lov_layout_state *state = &lov->u; - const struct lov_layout_operations *old_ops; - const struct lov_layout_operations *new_ops; - struct lu_env *env; - u16 refcheck; - int rc; - - LASSERT(lov->lo_type < ARRAY_SIZE(lov_dispatch)); - - env = cl_env_get(&refcheck); - if (IS_ERR(env)) - return PTR_ERR(env); - - LASSERT(llt < ARRAY_SIZE(lov_dispatch)); - - 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]; - - rc = cl_object_prune(env, &lov->lo_cl); - if (rc) - goto out; - - rc = old_ops->llo_delete(env, lov, &lov->u); - if (rc) - goto out; - - old_ops->llo_fini(env, lov, &lov->u); - - LASSERT(!atomic_read(&lov->lo_active_ios)); - - CDEBUG(D_INODE, DFID "Apply new layout lov %p, type %d\n", - PFID(lu_object_fid(lov2lu(lov))), lov, llt); - - lov->lo_type = LLT_EMPTY; - - /* page bufsize fixup */ - cl_object_header(&lov->lo_cl)->coh_page_bufsize -= - lov_page_slice_fixup(lov, NULL); - - rc = new_ops->llo_init(env, lov_dev, lov, lsm, conf, state); - if (rc) { - struct obd_device *obd = lov2obd(lov_dev->ld_lov); - - CERROR("%s: cannot apply new layout on " DFID " : rc = %d\n", - obd->obd_name, PFID(lu_object_fid(lov2lu(lov))), rc); - new_ops->llo_delete(env, lov, state); - new_ops->llo_fini(env, lov, state); - /* this file becomes an EMPTY file. */ - goto out; - } - - new_ops->llo_install(env, lov, state); - lov->lo_type = llt; -out: - cl_env_put(env, &refcheck); - return rc; -} - -/***************************************************************************** - * - * Lov object operations. - * - */ -int lov_object_init(const struct lu_env *env, struct lu_object *obj, - const struct lu_object_conf *conf) -{ - struct lov_object *lov = lu2lov(obj); - struct lov_device *dev = lov_object_dev(lov); - const struct cl_object_conf *cconf = lu2cl_conf(conf); - union lov_layout_state *set = &lov->u; - const struct lov_layout_operations *ops; - struct lov_stripe_md *lsm = NULL; - int rc; - - 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)); - - lov->lo_type = LLT_EMPTY; - if (cconf->u.coc_layout.lb_buf) { - lsm = lov_unpackmd(dev->ld_lov, - cconf->u.coc_layout.lb_buf, - cconf->u.coc_layout.lb_len); - if (IS_ERR(lsm)) - return PTR_ERR(lsm); - } - - /* no locking is necessary, as object is being created */ - lov->lo_type = lov_type(lsm); - ops = &lov_dispatch[lov->lo_type]; - rc = ops->llo_init(env, dev, lov, lsm, cconf, set); - if (!rc) - ops->llo_install(env, lov, set); - - lov_lsm_put(lsm); - - return rc; -} - -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; - - if (conf->coc_opc == OBJECT_CONF_SET && - conf->u.coc_layout.lb_buf) { - lsm = lov_unpackmd(lov_object_dev(lov)->ld_lov, - conf->u.coc_layout.lb_buf, - conf->u.coc_layout.lb_len); - if (IS_ERR(lsm)) - return PTR_ERR(lsm); - } - - 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 ((!lsm && !lov->lo_lsm) || - ((lsm && lov->lo_lsm) && - (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; - } - - result = lov_layout_change(env, lov, lsm, conf); - lov->lo_layout_invalid = result != 0; - -out: - lov_conf_unlock(lov); - lov_lsm_put(lsm); - 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); - kmem_cache_free(lov_object_kmem, lov); -} - -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, pgoff_t index) -{ - return LOV_2DISPATCH_NOLOCK(cl2lov(obj), llo_page_init, env, obj, page, - index); -} - -/** - * 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); - - CDEBUG(D_INODE, DFID "io %p type %d ignore/verify layout %d/%d\n", - PFID(lu_object_fid(&obj->co_lu)), io, io->ci_type, - io->ci_ignore_layout, io->ci_verify_layout); - - 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_update(const struct lu_env *env, struct cl_object *obj, - const struct cl_attr *attr, unsigned int 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); -} - -/** - * We calculate on which OST the mapping will end. If the length of mapping - * is greater than (stripe_size * stripe_count) then the last_stripe will - * will be one just before start_stripe. Else we check if the mapping - * intersects each OST and find last_stripe. - * This function returns the last_stripe and also sets the stripe_count - * over which the mapping is spread - * - * \param lsm [in] striping information for the file - * \param fm_start [in] logical start of mapping - * \param fm_end [in] logical end of mapping - * \param start_stripe [in] starting stripe of the mapping - * \param stripe_count [out] the number of stripes across which to map is - * returned - * - * \retval last_stripe return the last stripe of the mapping - */ -static int fiemap_calc_last_stripe(struct lov_stripe_md *lsm, - u64 fm_start, u64 fm_end, - int start_stripe, int *stripe_count) -{ - int last_stripe; - u64 obd_start; - u64 obd_end; - int i, j; - - if (fm_end - fm_start > lsm->lsm_stripe_size * lsm->lsm_stripe_count) { - last_stripe = (start_stripe < 1 ? lsm->lsm_stripe_count - 1 : - start_stripe - 1); - *stripe_count = lsm->lsm_stripe_count; - } else { - for (j = 0, i = start_stripe; j < lsm->lsm_stripe_count; - i = (i + 1) % lsm->lsm_stripe_count, j++) { - if (!(lov_stripe_intersects(lsm, i, fm_start, fm_end, - &obd_start, &obd_end))) - break; - } - *stripe_count = j; - last_stripe = (start_stripe + j - 1) % lsm->lsm_stripe_count; - } - - return last_stripe; -} - -/** - * Set fe_device and copy extents from local buffer into main return buffer. - * - * \param fiemap [out] fiemap to hold all extents - * \param lcl_fm_ext [in] array of fiemap extents get from OSC layer - * \param ost_index [in] OST index to be written into the fm_device - * field for each extent - * \param ext_count [in] number of extents to be copied - * \param current_extent [in] where to start copying in the extent array - */ -static void fiemap_prepare_and_copy_exts(struct fiemap *fiemap, - struct fiemap_extent *lcl_fm_ext, - int ost_index, unsigned int ext_count, - int current_extent) -{ - unsigned int ext; - char *to; - - for (ext = 0; ext < ext_count; ext++) { - lcl_fm_ext[ext].fe_device = ost_index; - lcl_fm_ext[ext].fe_flags |= FIEMAP_EXTENT_NET; - } - - /* Copy fm_extent's from fm_local to return buffer */ - to = (char *)fiemap + fiemap_count_to_size(current_extent); - memcpy(to, lcl_fm_ext, ext_count * sizeof(struct fiemap_extent)); -} - -#define FIEMAP_BUFFER_SIZE 4096 - -/** - * Non-zero fe_logical indicates that this is a continuation FIEMAP - * call. The local end offset and the device are sent in the first - * fm_extent. This function calculates the stripe number from the index. - * This function returns a stripe_no on which mapping is to be restarted. - * - * This function returns fm_end_offset which is the in-OST offset at which - * mapping should be restarted. If fm_end_offset=0 is returned then caller - * will re-calculate proper offset in next stripe. - * Note that the first extent is passed to lov_get_info via the value field. - * - * \param fiemap [in] fiemap request header - * \param lsm [in] striping information for the file - * \param fm_start [in] logical start of mapping - * \param fm_end [in] logical end of mapping - * \param start_stripe [out] starting stripe will be returned in this - */ -static u64 fiemap_calc_fm_end_offset(struct fiemap *fiemap, - struct lov_stripe_md *lsm, - u64 fm_start, u64 fm_end, - int *start_stripe) -{ - u64 local_end = fiemap->fm_extents[0].fe_logical; - u64 lun_start, lun_end; - u64 fm_end_offset; - int stripe_no = -1; - int i; - - if (!fiemap->fm_extent_count || !fiemap->fm_extents[0].fe_logical) - return 0; - - /* Find out stripe_no from ost_index saved in the fe_device */ - for (i = 0; i < lsm->lsm_stripe_count; i++) { - struct lov_oinfo *oinfo = lsm->lsm_oinfo[i]; - - if (lov_oinfo_is_dummy(oinfo)) - continue; - - if (oinfo->loi_ost_idx == fiemap->fm_extents[0].fe_device) { - stripe_no = i; - break; - } - } - - if (stripe_no == -1) - return -EINVAL; - - /* - * If we have finished mapping on previous device, shift logical - * offset to start of next device - */ - if (lov_stripe_intersects(lsm, stripe_no, fm_start, fm_end, - &lun_start, &lun_end) && - local_end < lun_end) { - fm_end_offset = local_end; - *start_stripe = stripe_no; - } else { - /* This is a special value to indicate that caller should - * calculate offset in next stripe. - */ - fm_end_offset = 0; - *start_stripe = (stripe_no + 1) % lsm->lsm_stripe_count; - } - - return fm_end_offset; -} - -struct fiemap_state { - struct fiemap *fs_fm; - u64 fs_start; - u64 fs_length; - u64 fs_end; - u64 fs_end_offset; - int fs_cur_extent; - int fs_cnt_need; - int fs_start_stripe; - int fs_last_stripe; - bool fs_device_done; - bool fs_finish; - bool fs_enough; -}; - -static int fiemap_for_stripe(const struct lu_env *env, struct cl_object *obj, - struct lov_stripe_md *lsm, - struct fiemap *fiemap, size_t *buflen, - struct ll_fiemap_info_key *fmkey, int stripeno, - struct fiemap_state *fs) -{ - struct cl_object *subobj; - struct lov_obd *lov = lu2lov_dev(obj->co_lu.lo_dev)->ld_lov; - struct fiemap_extent *fm_ext = &fs->fs_fm->fm_extents[0]; - u64 req_fm_len; /* Stores length of required mapping */ - u64 len_mapped_single_call; - u64 lun_start; - u64 lun_end; - u64 obd_object_end; - unsigned int ext_count; - /* EOF for object */ - bool ost_eof = false; - /* done with required mapping for this OST? */ - bool ost_done = false; - int ost_index; - int rc = 0; - - fs->fs_device_done = false; - /* Find out range of mapping on this stripe */ - if ((lov_stripe_intersects(lsm, stripeno, fs->fs_start, fs->fs_end, - &lun_start, &obd_object_end)) == 0) - return 0; - - if (lov_oinfo_is_dummy(lsm->lsm_oinfo[stripeno])) - return -EIO; - - /* If this is a continuation FIEMAP call and we are on - * starting stripe then lun_start needs to be set to - * end_offset - */ - if (fs->fs_end_offset != 0 && stripeno == fs->fs_start_stripe) - lun_start = fs->fs_end_offset; - - lun_end = fs->fs_length; - if (lun_end != ~0ULL) { - /* Handle fs->fs_start + fs->fs_length overflow */ - if (fs->fs_start + fs->fs_length < fs->fs_start) - fs->fs_length = ~0ULL - fs->fs_start; - lun_end = lov_size_to_stripe(lsm, fs->fs_start + fs->fs_length, - stripeno); - } - - if (lun_start == lun_end) - return 0; - - req_fm_len = obd_object_end - lun_start; - fs->fs_fm->fm_length = 0; - len_mapped_single_call = 0; - - /* find lobsub object */ - subobj = lov_find_subobj(env, cl2lov(obj), lsm, stripeno); - if (IS_ERR(subobj)) - return PTR_ERR(subobj); - /* If the output buffer is very large and the objects have many - * extents we may need to loop on a single OST repeatedly - */ - do { - if (fiemap->fm_extent_count > 0) { - /* Don't get too many extents. */ - if (fs->fs_cur_extent + fs->fs_cnt_need > - fiemap->fm_extent_count) - fs->fs_cnt_need = fiemap->fm_extent_count - - fs->fs_cur_extent; - } - - lun_start += len_mapped_single_call; - fs->fs_fm->fm_length = req_fm_len - len_mapped_single_call; - req_fm_len = fs->fs_fm->fm_length; - fs->fs_fm->fm_extent_count = fs->fs_enough ? - 1 : fs->fs_cnt_need; - fs->fs_fm->fm_mapped_extents = 0; - fs->fs_fm->fm_flags = fiemap->fm_flags; - - ost_index = lsm->lsm_oinfo[stripeno]->loi_ost_idx; - - if (ost_index < 0 || ost_index >= lov->desc.ld_tgt_count) { - rc = -EINVAL; - goto obj_put; - } - /* If OST is inactive, return extent with UNKNOWN flag. */ - if (!lov->lov_tgts[ost_index]->ltd_active) { - fs->fs_fm->fm_flags |= FIEMAP_EXTENT_LAST; - fs->fs_fm->fm_mapped_extents = 1; - - fm_ext[0].fe_logical = lun_start; - fm_ext[0].fe_length = obd_object_end - lun_start; - fm_ext[0].fe_flags |= FIEMAP_EXTENT_UNKNOWN; - - goto inactive_tgt; - } - - fs->fs_fm->fm_start = lun_start; - fs->fs_fm->fm_flags &= ~FIEMAP_FLAG_DEVICE_ORDER; - memcpy(&fmkey->lfik_fiemap, fs->fs_fm, sizeof(*fs->fs_fm)); - *buflen = fiemap_count_to_size(fs->fs_fm->fm_extent_count); - - rc = cl_object_fiemap(env, subobj, fmkey, fs->fs_fm, buflen); - if (rc) - goto obj_put; -inactive_tgt: - ext_count = fs->fs_fm->fm_mapped_extents; - if (ext_count == 0) { - ost_done = true; - fs->fs_device_done = true; - /* If last stripe has hold at the end, - * we need to return - */ - if (stripeno == fs->fs_last_stripe) { - fiemap->fm_mapped_extents = 0; - fs->fs_finish = true; - goto obj_put; - } - break; - } else if (fs->fs_enough) { - /* - * We've collected enough extents and there are - * more extents after it. - */ - fs->fs_finish = true; - goto obj_put; - } - - /* If we just need num of extents, got to next device */ - if (fiemap->fm_extent_count == 0) { - fs->fs_cur_extent += ext_count; - break; - } - - /* prepare to copy retrived map extents */ - len_mapped_single_call = fm_ext[ext_count - 1].fe_logical + - fm_ext[ext_count - 1].fe_length - - lun_start; - - /* Have we finished mapping on this device? */ - if (req_fm_len <= len_mapped_single_call) { - ost_done = true; - fs->fs_device_done = true; - } - - /* Clear the EXTENT_LAST flag which can be present on - * the last extent - */ - if (fm_ext[ext_count - 1].fe_flags & FIEMAP_EXTENT_LAST) - fm_ext[ext_count - 1].fe_flags &= ~FIEMAP_EXTENT_LAST; - if (lov_stripe_size(lsm, fm_ext[ext_count - 1].fe_logical + - fm_ext[ext_count - 1].fe_length, - stripeno) >= fmkey->lfik_oa.o_size) { - ost_eof = true; - fs->fs_device_done = true; - } - - fiemap_prepare_and_copy_exts(fiemap, fm_ext, ost_index, - ext_count, fs->fs_cur_extent); - fs->fs_cur_extent += ext_count; - - /* Ran out of available extents? */ - if (fs->fs_cur_extent >= fiemap->fm_extent_count) - fs->fs_enough = true; - } while (!ost_done && !ost_eof); - - if (stripeno == fs->fs_last_stripe) - fs->fs_finish = true; -obj_put: - cl_object_put(env, subobj); - - return rc; -} - -/** - * Break down the FIEMAP request and send appropriate calls to individual OSTs. - * This also handles the restarting of FIEMAP calls in case mapping overflows - * the available number of extents in single call. - * - * \param env [in] lustre environment - * \param obj [in] file object - * \param fmkey [in] fiemap request header and other info - * \param fiemap [out] fiemap buffer holding retrived map extents - * \param buflen [in/out] max buffer length of @fiemap, when iterate - * each OST, it is used to limit max map needed - * \retval 0 success - * \retval < 0 error - */ -static int lov_object_fiemap(const struct lu_env *env, struct cl_object *obj, - struct ll_fiemap_info_key *fmkey, - struct fiemap *fiemap, size_t *buflen) -{ - unsigned int buffer_size = FIEMAP_BUFFER_SIZE; - struct fiemap *fm_local = NULL; - struct lov_stripe_md *lsm; - int rc = 0; - int cur_stripe; - int stripe_count; - struct fiemap_state fs = { NULL }; - - lsm = lov_lsm_addref(cl2lov(obj)); - if (!lsm) - return -ENODATA; - - /** - * If the stripe_count > 1 and the application does not understand - * DEVICE_ORDER flag, it cannot interpret the extents correctly. - */ - if (lsm->lsm_stripe_count > 1 && - !(fiemap->fm_flags & FIEMAP_FLAG_DEVICE_ORDER)) { - rc = -ENOTSUPP; - goto out; - } - - if (lsm_is_released(lsm)) { - if (fiemap->fm_start < fmkey->lfik_oa.o_size) { - /** - * released file, return a minimal FIEMAP if - * request fits in file-size. - */ - fiemap->fm_mapped_extents = 1; - fiemap->fm_extents[0].fe_logical = fiemap->fm_start; - if (fiemap->fm_start + fiemap->fm_length < - fmkey->lfik_oa.o_size) - fiemap->fm_extents[0].fe_length = - fiemap->fm_length; - else - fiemap->fm_extents[0].fe_length = - fmkey->lfik_oa.o_size - - fiemap->fm_start; - fiemap->fm_extents[0].fe_flags |= - FIEMAP_EXTENT_UNKNOWN | FIEMAP_EXTENT_LAST; - } - rc = 0; - goto out; - } - - if (fiemap_count_to_size(fiemap->fm_extent_count) < buffer_size) - buffer_size = fiemap_count_to_size(fiemap->fm_extent_count); - - fm_local = kvzalloc(buffer_size, GFP_NOFS); - if (!fm_local) { - rc = -ENOMEM; - goto out; - } - fs.fs_fm = fm_local; - fs.fs_cnt_need = fiemap_size_to_count(buffer_size); - - fs.fs_start = fiemap->fm_start; - /* fs_start is beyond the end of the file */ - if (fs.fs_start > fmkey->lfik_oa.o_size) { - rc = -EINVAL; - goto out; - } - /* Calculate start stripe, last stripe and length of mapping */ - fs.fs_start_stripe = lov_stripe_number(lsm, fs.fs_start); - fs.fs_end = (fs.fs_length == ~0ULL) ? fmkey->lfik_oa.o_size : - fs.fs_start + fs.fs_length - 1; - /* If fs_length != ~0ULL but fs_start+fs_length-1 exceeds file size */ - if (fs.fs_end > fmkey->lfik_oa.o_size) { - fs.fs_end = fmkey->lfik_oa.o_size; - fs.fs_length = fs.fs_end - fs.fs_start; - } - - fs.fs_last_stripe = fiemap_calc_last_stripe(lsm, fs.fs_start, fs.fs_end, - fs.fs_start_stripe, - &stripe_count); - fs.fs_end_offset = fiemap_calc_fm_end_offset(fiemap, lsm, fs.fs_start, - fs.fs_end, - &fs.fs_start_stripe); - if (fs.fs_end_offset == -EINVAL) { - rc = -EINVAL; - goto out; - } - - - /** - * Requested extent count exceeds the fiemap buffer size, shrink our - * ambition. - */ - if (fiemap_count_to_size(fiemap->fm_extent_count) > *buflen) - fiemap->fm_extent_count = fiemap_size_to_count(*buflen); - if (!fiemap->fm_extent_count) - fs.fs_cnt_need = 0; - - fs.fs_finish = false; - fs.fs_enough = false; - fs.fs_cur_extent = 0; - - /* Check each stripe */ - for (cur_stripe = fs.fs_start_stripe; stripe_count > 0; - --stripe_count, - cur_stripe = (cur_stripe + 1) % lsm->lsm_stripe_count) { - rc = fiemap_for_stripe(env, obj, lsm, fiemap, buflen, fmkey, - cur_stripe, &fs); - if (rc < 0) - goto out; - if (fs.fs_finish) - break; - } /* for each stripe */ - /* - * Indicate that we are returning device offsets unless file just has - * single stripe - */ - if (lsm->lsm_stripe_count > 1) - fiemap->fm_flags |= FIEMAP_FLAG_DEVICE_ORDER; - - if (!fiemap->fm_extent_count) - goto skip_last_device_calc; - - /* - * Check if we have reached the last stripe and whether mapping for that - * stripe is done. - */ - if ((cur_stripe == fs.fs_last_stripe) && fs.fs_device_done) - fiemap->fm_extents[fs.fs_cur_extent - 1].fe_flags |= - FIEMAP_EXTENT_LAST; -skip_last_device_calc: - fiemap->fm_mapped_extents = fs.fs_cur_extent; -out: - kvfree(fm_local); - lov_lsm_put(lsm); - return rc; -} - -static int lov_object_getstripe(const struct lu_env *env, struct cl_object *obj, - struct lov_user_md __user *lum) -{ - struct lov_object *lov = cl2lov(obj); - struct lov_stripe_md *lsm; - int rc = 0; - - lsm = lov_lsm_addref(lov); - if (!lsm) - return -ENODATA; - - rc = lov_getstripe(cl2lov(obj), lsm, lum); - lov_lsm_put(lsm); - return rc; -} - -static int lov_object_layout_get(const struct lu_env *env, - struct cl_object *obj, - struct cl_layout *cl) -{ - struct lov_object *lov = cl2lov(obj); - struct lov_stripe_md *lsm = lov_lsm_addref(lov); - struct lu_buf *buf = &cl->cl_buf; - ssize_t rc; - - if (!lsm) { - cl->cl_size = 0; - cl->cl_layout_gen = CL_LAYOUT_GEN_EMPTY; - return 0; - } - - cl->cl_size = lov_mds_md_size(lsm->lsm_stripe_count, lsm->lsm_magic); - cl->cl_layout_gen = lsm->lsm_layout_gen; - - rc = lov_lsm_pack(lsm, buf->lb_buf, buf->lb_len); - lov_lsm_put(lsm); - - return rc < 0 ? rc : 0; -} - -static loff_t lov_object_maxbytes(struct cl_object *obj) -{ - struct lov_object *lov = cl2lov(obj); - struct lov_stripe_md *lsm = lov_lsm_addref(lov); - loff_t maxbytes; - - if (!lsm) - return LLONG_MAX; - - maxbytes = lsm->lsm_maxbytes; - - lov_lsm_put(lsm); - - return maxbytes; -} - -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_update = lov_attr_update, - .coo_conf_set = lov_conf_set, - .coo_getstripe = lov_object_getstripe, - .coo_layout_get = lov_object_layout_get, - .coo_maxbytes = lov_object_maxbytes, - .coo_fiemap = lov_object_fiemap, -}; - -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; - - lov = kmem_cache_zalloc(lov_object_kmem, GFP_NOFS); - if (lov) { - 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) { - 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; -} - -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) { - 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; - 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 */ |