X-Git-Url: https://git.whamcloud.com/?a=blobdiff_plain;f=lustre%2Fofd%2Fofd_lvb.c;h=ec1cae318cdfafb23e8fa8d67e9e3ad81422d344;hb=f41968bb9e82836a06ffcd5fd3ed6a04b9273545;hp=edadc699d9186a849af37efe43c80fab80541554;hpb=08aa217ce49aba1ded52e0f7adb8a607035123fd;p=fs%2Flustre-release.git diff --git a/lustre/ofd/ofd_lvb.c b/lustre/ofd/ofd_lvb.c index edadc69..ec1cae3 100644 --- a/lustre/ofd/ofd_lvb.c +++ b/lustre/ofd/ofd_lvb.c @@ -15,11 +15,7 @@ * * 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. + * http://www.gnu.org/licenses/gpl-2.0.html * * GPL HEADER END */ @@ -27,7 +23,7 @@ * Copyright (c) 2009, 2010, Oracle and/or its affiliates. All rights reserved. * Use is subject to license terms. * - * Copyright (c) 2012, Intel Corporation. + * Copyright (c) 2012, 2014 Intel Corporation. */ /* * This file is part of Lustre, http://www.lustre.org/ @@ -35,14 +31,34 @@ * * lustre/ofd/ofd_lvb.c * - * Author: Mikhail Pershin - * Author: Alexey Zhuravlev + * This file contains methods for OBD Filter Device (OFD) + * Lock Value Block (LVB) operations. + * + * LVB is special opaque (to LDLM) data that is associated with an LDLM lock + * and transferred from client to server and back. OFD LVBs are used to + * maintain current object size/times. + * + * Author: Andreas Dilger + * Author: Mikhail Pershin + * Author: Alexey Zhuravlev */ #define DEBUG_SUBSYSTEM S_FILTER +#include #include "ofd_internal.h" +/** + * Implementation of ldlm_valblock_ops::lvbo_free for OFD. + * + * This function frees allocated LVB data if it associated with the given + * LDLM resource. + * + * \param[in] res LDLM resource + * + * \retval 0 on successful setup + * \retval negative value on error + */ static int ofd_lvbo_free(struct ldlm_resource *res) { if (res->lr_lvb_data) @@ -51,10 +67,24 @@ static int ofd_lvbo_free(struct ldlm_resource *res) return 0; } -/* Called with res->lr_lvb_sem held */ +/** + * Implementation of ldlm_valblock_ops::lvbo_init for OFD. + * + * This function allocates and initializes new LVB data for the given + * LDLM resource if it is not allocated yet. New LVB is filled with attributes + * of the object associated with that resource. Function does nothing if LVB + * for the given LDLM resource is allocated already. + * + * Called with res->lr_lvb_sem held. + * + * \param[in] res LDLM resource + * + * \retval 0 on successful setup + * \retval negative value on error + */ static int ofd_lvbo_init(struct ldlm_resource *res) { - struct ost_lvb *lvb = NULL; + struct ost_lvb *lvb; struct ofd_device *ofd; struct ofd_object *fo; struct ofd_thread_info *info; @@ -64,7 +94,7 @@ static int ofd_lvbo_init(struct ldlm_resource *res) ENTRY; LASSERT(res); - LASSERT_MUTEX_LOCKED(&res->lr_lvb_mutex); + LASSERT(mutex_is_locked(&res->lr_lvb_mutex)); if (res->lr_lvb_data != NULL) RETURN(0); @@ -72,26 +102,30 @@ static int ofd_lvbo_init(struct ldlm_resource *res) ofd = ldlm_res_to_ns(res)->ns_lvbp; LASSERT(ofd != NULL); + if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_OST_LVB)) + RETURN(-ENOMEM); + rc = lu_env_init(&env, LCT_DT_THREAD); if (rc) RETURN(rc); OBD_ALLOC_PTR(lvb); if (lvb == NULL) - RETURN(-ENOMEM); + GOTO(out_env, rc = -ENOMEM); res->lr_lvb_data = lvb; res->lr_lvb_len = sizeof(*lvb); info = ofd_info_init(&env, NULL); - ofd_fid_from_resid(&info->fti_fid, &res->lr_name); + ost_fid_from_resid(&info->fti_fid, &res->lr_name, + ofd->ofd_lut.lut_lsd.lsd_osd_index); fo = ofd_object_find(&env, ofd, &info->fti_fid); if (IS_ERR(fo)) - GOTO(out, rc = PTR_ERR(fo)); + GOTO(out_lvb, rc = PTR_ERR(fo)); rc = ofd_attr_get(&env, fo, &info->fti_attr); if (rc) - GOTO(out_put, rc); + GOTO(out_obj, rc); lvb->lvb_size = info->fti_attr.la_size; lvb->lvb_blocks = info->fti_attr.la_blocks; @@ -99,28 +133,51 @@ static int ofd_lvbo_init(struct ldlm_resource *res) lvb->lvb_atime = info->fti_attr.la_atime; lvb->lvb_ctime = info->fti_attr.la_ctime; - CDEBUG(D_DLMTRACE, "res: "LPX64" initial lvb size: "LPX64", " + CDEBUG(D_DLMTRACE, "res: "DFID" initial lvb size: "LPU64", " "mtime: "LPX64", blocks: "LPX64"\n", - res->lr_name.name[0], lvb->lvb_size, + PFID(&info->fti_fid), lvb->lvb_size, lvb->lvb_mtime, lvb->lvb_blocks); EXIT; -out_put: +out_obj: ofd_object_put(&env, fo); -out: - lu_env_fini(&env); - if (rc) +out_lvb: + if (rc != 0) OST_LVB_SET_ERR(lvb->lvb_blocks, rc); +out_env: + lu_env_fini(&env); /* Don't free lvb data on lookup error */ return rc; } -/* This will be called in two ways: +/** + * Implementation of ldlm_valblock_ops::lvbo_update for OFD. + * + * When a client generates a glimpse enqueue, it wants to get the current + * file size and updated attributes for a stat() type operation, but these + * attributes may be writeback cached on another client. The client with + * the DLM extent lock at the highest offset is asked for its current + * attributes via a glimpse callback on its extent lock, on the assumption + * that it has the highest file size and the newest timestamps. The timestamps + * are guaranteed to be correct if there is only a single writer on the file, + * but may be slightly inaccurate if there are multiple concurrent writers on + * the same object. In order to avoid race conditions between the glimpse AST + * and the client cancelling the lock, ofd_lvbo_update() also updates + * the attributes from the local object. If the last client hasn't done any + * writes yet, or has already written its data and cancelled its lock before + * it processed the glimpse, then the local inode will have more uptodate + * information. * - * r != NULL : called by the DLM itself after a glimpse callback - * r == NULL : called by the ofd after a disk write + * This is called in two ways: + * \a req != NULL : called by the DLM itself after a glimpse callback + * \a req == NULL : called by the OFD after a disk write * - * If 'increase_only' is true, don't allow values to move backwards. + * \param[in] res LDLM resource + * \param[in] req PTLRPC request + * \param[in] increase_only don't allow LVB values to decrease + * + * \retval 0 on successful setup + * \retval negative value on error */ static int ofd_lvbo_update(struct ldlm_resource *res, struct ptlrpc_request *req, int increase_only) @@ -139,18 +196,20 @@ static int ofd_lvbo_update(struct ldlm_resource *res, ofd = ldlm_res_to_ns(res)->ns_lvbp; LASSERT(ofd != NULL); - lvb = res->lr_lvb_data; - if (lvb == NULL) { - CERROR("%s: no lvb when running lvbo_update, res: "LPU64"!\n", - ofd_obd(ofd)->obd_name, res->lr_name.name[0]); - RETURN(0); - } - rc = lu_env_init(&env, LCT_DT_THREAD); if (rc) - GOTO(out_unlock, rc); + RETURN(rc); info = ofd_info_init(&env, NULL); + fid_extract_from_res_name(&info->fti_fid, &res->lr_name); + + lvb = res->lr_lvb_data; + if (lvb == NULL) { + CERROR("%s: no LVB data for "DFID"\n", + ofd_name(ofd), PFID(&info->fti_fid)); + GOTO(out_env, rc = 0); + } + /* Update the LVB from the network message */ if (req != NULL) { struct ost_lvb *rpc_lvb; @@ -184,32 +243,32 @@ static int ofd_lvbo_update(struct ldlm_resource *res, lock_res(res); if (rpc_lvb->lvb_size > lvb->lvb_size || !increase_only) { - CDEBUG(D_DLMTRACE, "res: "LPU64" updating lvb size: " - LPU64" -> "LPU64"\n", res->lr_name.name[0], + CDEBUG(D_DLMTRACE, "res: "DFID" updating lvb size: " + LPU64" -> "LPU64"\n", PFID(&info->fti_fid), lvb->lvb_size, rpc_lvb->lvb_size); lvb->lvb_size = rpc_lvb->lvb_size; } if (rpc_lvb->lvb_mtime > lvb->lvb_mtime || !increase_only) { - CDEBUG(D_DLMTRACE, "res: "LPU64" updating lvb mtime: " - LPU64" -> "LPU64"\n", res->lr_name.name[0], + CDEBUG(D_DLMTRACE, "res: "DFID" updating lvb mtime: " + LPU64" -> "LPU64"\n", PFID(&info->fti_fid), lvb->lvb_mtime, rpc_lvb->lvb_mtime); lvb->lvb_mtime = rpc_lvb->lvb_mtime; } if (rpc_lvb->lvb_atime > lvb->lvb_atime || !increase_only) { - CDEBUG(D_DLMTRACE, "res: "LPU64" updating lvb atime: " - LPU64" -> "LPU64"\n", res->lr_name.name[0], + CDEBUG(D_DLMTRACE, "res: "DFID" updating lvb atime: " + LPU64" -> "LPU64"\n", PFID(&info->fti_fid), lvb->lvb_atime, rpc_lvb->lvb_atime); lvb->lvb_atime = rpc_lvb->lvb_atime; } if (rpc_lvb->lvb_ctime > lvb->lvb_ctime || !increase_only) { - CDEBUG(D_DLMTRACE, "res: "LPU64" updating lvb ctime: " - LPU64" -> "LPU64"\n", res->lr_name.name[0], + CDEBUG(D_DLMTRACE, "res: "DFID" updating lvb ctime: " + LPU64" -> "LPU64"\n", PFID(&info->fti_fid), lvb->lvb_ctime, rpc_lvb->lvb_ctime); lvb->lvb_ctime = rpc_lvb->lvb_ctime; } if (rpc_lvb->lvb_blocks > lvb->lvb_blocks || !increase_only) { - CDEBUG(D_DLMTRACE, "res: "LPU64" updating lvb blocks: " - LPU64" -> "LPU64"\n", res->lr_name.name[0], + CDEBUG(D_DLMTRACE, "res: "DFID" updating lvb blocks: " + LPU64" -> "LPU64"\n", PFID(&info->fti_fid), lvb->lvb_blocks, rpc_lvb->lvb_blocks); lvb->lvb_blocks = rpc_lvb->lvb_blocks; } @@ -218,7 +277,8 @@ static int ofd_lvbo_update(struct ldlm_resource *res, disk_update: /* Update the LVB from the disk inode */ - ofd_fid_from_resid(&info->fti_fid, &res->lr_name); + ost_fid_from_resid(&info->fti_fid, &res->lr_name, + ofd->ofd_lut.lut_lsd.lsd_osd_index); fo = ofd_object_find(&env, ofd, &info->fti_fid); if (IS_ERR(fo)) GOTO(out_env, rc = PTR_ERR(fo)); @@ -229,34 +289,33 @@ disk_update: lock_res(res); if (info->fti_attr.la_size > lvb->lvb_size || !increase_only) { - CDEBUG(D_DLMTRACE, "res: "LPU64" updating lvb size from disk: " - LPU64" -> %llu\n", res->lr_name.name[0], + CDEBUG(D_DLMTRACE, "res: "DFID" updating lvb size from disk: " + LPU64" -> %llu\n", PFID(&info->fti_fid), lvb->lvb_size, info->fti_attr.la_size); lvb->lvb_size = info->fti_attr.la_size; } if (info->fti_attr.la_mtime >lvb->lvb_mtime || !increase_only) { - CDEBUG(D_DLMTRACE, "res: "LPU64" updating lvb mtime from disk: " - LPU64" -> "LPU64"\n", res->lr_name.name[0], + CDEBUG(D_DLMTRACE, "res: "DFID" updating lvb mtime from disk: " + LPU64" -> "LPU64"\n", PFID(&info->fti_fid), lvb->lvb_mtime, info->fti_attr.la_mtime); lvb->lvb_mtime = info->fti_attr.la_mtime; } if (info->fti_attr.la_atime >lvb->lvb_atime || !increase_only) { - CDEBUG(D_DLMTRACE, "res: "LPU64" updating lvb atime from disk: " - LPU64" -> "LPU64"\n", res->lr_name.name[0], + CDEBUG(D_DLMTRACE, "res: "DFID" updating lvb atime from disk: " + LPU64" -> "LPU64"\n", PFID(&info->fti_fid), lvb->lvb_atime, info->fti_attr.la_atime); lvb->lvb_atime = info->fti_attr.la_atime; } if (info->fti_attr.la_ctime >lvb->lvb_ctime || !increase_only) { - CDEBUG(D_DLMTRACE, "res: "LPU64" updating lvb ctime from disk: " - LPU64" -> "LPU64"\n", res->lr_name.name[0], + CDEBUG(D_DLMTRACE, "res: "DFID" updating lvb ctime from disk: " + LPU64" -> "LPU64"\n", PFID(&info->fti_fid), lvb->lvb_ctime, info->fti_attr.la_ctime); lvb->lvb_ctime = info->fti_attr.la_ctime; } if (info->fti_attr.la_blocks > lvb->lvb_blocks || !increase_only) { - CDEBUG(D_DLMTRACE,"res: "LPU64" updating lvb blocks from disk: " - LPU64" -> %llu\n", res->lr_name.name[0], - lvb->lvb_blocks, + CDEBUG(D_DLMTRACE, "res: "DFID" updating lvb blocks from disk: " + LPU64" -> %llu\n", PFID(&info->fti_fid), lvb->lvb_blocks, (unsigned long long)info->fti_attr.la_blocks); lvb->lvb_blocks = info->fti_attr.la_blocks; } @@ -266,10 +325,20 @@ out_obj: ofd_object_put(&env, fo); out_env: lu_env_fini(&env); -out_unlock: return rc; } +/** + * Implementation of ldlm_valblock_ops::lvbo_size for OFD. + * + * This function returns size of LVB data so appropriate RPC size will be + * reserved. This is used for compatibility needs between server and client + * of different Lustre versions. + * + * \param[in] lock LDLM lock + * + * \retval size of LVB data + */ static int ofd_lvbo_size(struct ldlm_lock *lock) { if (lock->l_export != NULL && exp_connect_lvb_type(lock->l_export)) @@ -278,10 +347,31 @@ static int ofd_lvbo_size(struct ldlm_lock *lock) return sizeof(struct ost_lvb_v1); } +/** + * Implementation of ldlm_valblock_ops::lvbo_fill for OFD. + * + * This function is called to fill the given RPC buffer \a buf with LVB data + * + * \param[in] lock LDLM lock + * \param[in] buf RPC buffer to fill + * \param[in] buflen buffer length + * + * \retval size of LVB data written into \a buf buffer + */ static int ofd_lvbo_fill(struct ldlm_lock *lock, void *buf, int buflen) { struct ldlm_resource *res = lock->l_resource; - int lvb_len = min_t(int, res->lr_lvb_len, buflen); + int lvb_len; + + /* Former lvbo_init not allocate the "LVB". */ + if (unlikely(res->lr_lvb_len == 0)) + return 0; + + lvb_len = ofd_lvbo_size(lock); + LASSERT(lvb_len <= res->lr_lvb_len); + + if (lvb_len > buflen) + lvb_len = buflen; lock_res(res); memcpy(buf, res->lr_lvb_data, lvb_len); @@ -291,9 +381,9 @@ static int ofd_lvbo_fill(struct ldlm_lock *lock, void *buf, int buflen) } struct ldlm_valblock_ops ofd_lvbo = { - lvbo_init: ofd_lvbo_init, - lvbo_update: ofd_lvbo_update, - lvbo_free: ofd_lvbo_free, - lvbo_size: ofd_lvbo_size, - lvbo_fill: ofd_lvbo_fill + .lvbo_init = ofd_lvbo_init, + .lvbo_update = ofd_lvbo_update, + .lvbo_free = ofd_lvbo_free, + .lvbo_size = ofd_lvbo_size, + .lvbo_fill = ofd_lvbo_fill };