diff options
Diffstat (limited to 'drivers/staging/lustre/lustre/lov/lov_merge.c')
| -rw-r--r-- | drivers/staging/lustre/lustre/lov/lov_merge.c | 218 |
1 files changed, 218 insertions, 0 deletions
diff --git a/drivers/staging/lustre/lustre/lov/lov_merge.c b/drivers/staging/lustre/lustre/lov/lov_merge.c new file mode 100644 index 000000000000..ddbac1220263 --- /dev/null +++ b/drivers/staging/lustre/lustre/lov/lov_merge.c @@ -0,0 +1,218 @@ +/* + * 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) 2005, 2010, Oracle and/or its affiliates. All rights reserved. + * Use is subject to license terms. + * + * Copyright (c) 2012, Intel Corporation. + */ +/* + * This file is part of Lustre, http://www.lustre.org/ + * Lustre is a trademark of Sun Microsystems, Inc. + */ + +#define DEBUG_SUBSYSTEM S_LOV + +#include <linux/libcfs/libcfs.h> + +#include <obd_class.h> +#include <obd_lov.h> + +#include "lov_internal.h" + +/** Merge the lock value block(&lvb) attributes and KMS from each of the + * stripes in a file into a single lvb. It is expected that the caller + * initializes the current atime, mtime, ctime to avoid regressing a more + * uptodate time on the local client. + */ +int lov_merge_lvb_kms(struct lov_stripe_md *lsm, + struct ost_lvb *lvb, __u64 *kms_place) +{ + __u64 size = 0; + __u64 kms = 0; + __u64 blocks = 0; + obd_time current_mtime = lvb->lvb_mtime; + obd_time current_atime = lvb->lvb_atime; + obd_time current_ctime = lvb->lvb_ctime; + int i; + int rc = 0; + + LASSERT(spin_is_locked(&lsm->lsm_lock)); + LASSERT(lsm->lsm_lock_owner == current_pid()); + + CDEBUG(D_INODE, "MDT ID "DOSTID" initial value: s="LPU64" m="LPU64 + " a="LPU64" c="LPU64" b="LPU64"\n", POSTID(&lsm->lsm_oi), + lvb->lvb_size, lvb->lvb_mtime, lvb->lvb_atime, lvb->lvb_ctime, + lvb->lvb_blocks); + for (i = 0; i < lsm->lsm_stripe_count; i++) { + struct lov_oinfo *loi = lsm->lsm_oinfo[i]; + obd_size lov_size, tmpsize; + + if (OST_LVB_IS_ERR(loi->loi_lvb.lvb_blocks)) { + rc = OST_LVB_GET_ERR(loi->loi_lvb.lvb_blocks); + continue; + } + + tmpsize = loi->loi_kms; + lov_size = lov_stripe_size(lsm, tmpsize, i); + if (lov_size > kms) + kms = lov_size; + + if (loi->loi_lvb.lvb_size > tmpsize) + tmpsize = loi->loi_lvb.lvb_size; + + lov_size = lov_stripe_size(lsm, tmpsize, i); + if (lov_size > size) + size = lov_size; + /* merge blocks, mtime, atime */ + blocks += loi->loi_lvb.lvb_blocks; + if (loi->loi_lvb.lvb_mtime > current_mtime) + current_mtime = loi->loi_lvb.lvb_mtime; + if (loi->loi_lvb.lvb_atime > current_atime) + current_atime = loi->loi_lvb.lvb_atime; + if (loi->loi_lvb.lvb_ctime > current_ctime) + current_ctime = loi->loi_lvb.lvb_ctime; + + CDEBUG(D_INODE, "MDT ID "DOSTID" on OST[%u]: s="LPU64" m="LPU64 + " a="LPU64" c="LPU64" b="LPU64"\n", POSTID(&lsm->lsm_oi), + loi->loi_ost_idx, loi->loi_lvb.lvb_size, + loi->loi_lvb.lvb_mtime, loi->loi_lvb.lvb_atime, + loi->loi_lvb.lvb_ctime, loi->loi_lvb.lvb_blocks); + } + + *kms_place = kms; + lvb->lvb_size = size; + lvb->lvb_blocks = blocks; + lvb->lvb_mtime = current_mtime; + lvb->lvb_atime = current_atime; + lvb->lvb_ctime = current_ctime; + RETURN(rc); +} + +/** Merge the lock value block(&lvb) attributes from each of the stripes in a + * file into a single lvb. It is expected that the caller initializes the + * current atime, mtime, ctime to avoid regressing a more uptodate time on + * the local client. + * + * If \a kms_only is set then we do not consider the recently seen size (rss) + * when updating the known minimum size (kms). Even when merging RSS, we will + * take the KMS value if it's larger. This prevents getattr from stomping on + * dirty cached pages which extend the file size. */ +int lov_merge_lvb(struct obd_export *exp, + struct lov_stripe_md *lsm, struct ost_lvb *lvb, int kms_only) +{ + int rc; + __u64 kms; + + ENTRY; + lov_stripe_lock(lsm); + rc = lov_merge_lvb_kms(lsm, lvb, &kms); + lov_stripe_unlock(lsm); + if (kms_only) + lvb->lvb_size = kms; + + CDEBUG(D_INODE, "merged for ID "DOSTID" s="LPU64" m="LPU64" a="LPU64 + " c="LPU64" b="LPU64"\n", POSTID(&lsm->lsm_oi), lvb->lvb_size, + lvb->lvb_mtime, lvb->lvb_atime, lvb->lvb_ctime, lvb->lvb_blocks); + RETURN(rc); +} + +/* Must be called under the lov_stripe_lock() */ +int lov_adjust_kms(struct obd_export *exp, struct lov_stripe_md *lsm, + obd_off size, int shrink) +{ + struct lov_oinfo *loi; + int stripe = 0; + __u64 kms; + ENTRY; + + LASSERT(spin_is_locked(&lsm->lsm_lock)); + LASSERT(lsm->lsm_lock_owner == current_pid()); + + if (shrink) { + for (; stripe < lsm->lsm_stripe_count; stripe++) { + struct lov_oinfo *loi = lsm->lsm_oinfo[stripe]; + kms = lov_size_to_stripe(lsm, size, stripe); + CDEBUG(D_INODE, + "stripe %d KMS %sing "LPU64"->"LPU64"\n", + stripe, kms > loi->loi_kms ? "increas":"shrink", + loi->loi_kms, kms); + loi_kms_set(loi, loi->loi_lvb.lvb_size = kms); + } + RETURN(0); + } + + if (size > 0) + stripe = lov_stripe_number(lsm, size - 1); + kms = lov_size_to_stripe(lsm, size, stripe); + loi = lsm->lsm_oinfo[stripe]; + + CDEBUG(D_INODE, "stripe %d KMS %sincreasing "LPU64"->"LPU64"\n", + stripe, kms > loi->loi_kms ? "" : "not ", loi->loi_kms, kms); + if (kms > loi->loi_kms) + loi_kms_set(loi, kms); + + RETURN(0); +} + +void lov_merge_attrs(struct obdo *tgt, struct obdo *src, obd_valid valid, + struct lov_stripe_md *lsm, int stripeno, int *set) +{ + valid &= src->o_valid; + + if (*set) { + if (valid & OBD_MD_FLSIZE) { + /* this handles sparse files properly */ + obd_size lov_size; + + lov_size = lov_stripe_size(lsm, src->o_size, stripeno); + if (lov_size > tgt->o_size) + tgt->o_size = lov_size; + } + if (valid & OBD_MD_FLBLOCKS) + tgt->o_blocks += src->o_blocks; + if (valid & OBD_MD_FLBLKSZ) + tgt->o_blksize += src->o_blksize; + if (valid & OBD_MD_FLCTIME && tgt->o_ctime < src->o_ctime) + tgt->o_ctime = src->o_ctime; + if (valid & OBD_MD_FLMTIME && tgt->o_mtime < src->o_mtime) + tgt->o_mtime = src->o_mtime; + if (valid & OBD_MD_FLDATAVERSION) + tgt->o_data_version += src->o_data_version; + } else { + memcpy(tgt, src, sizeof(*tgt)); + tgt->o_oi = lsm->lsm_oi; + if (valid & OBD_MD_FLSIZE) + tgt->o_size = lov_stripe_size(lsm, src->o_size, + stripeno); + } + + /* data_version needs to be valid on all stripes to be correct! */ + if (!(valid & OBD_MD_FLDATAVERSION)) + tgt->o_valid &= ~OBD_MD_FLDATAVERSION; + + *set += 1; +} |