/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*- * vim:expandtab:shiftwidth=8:tabstop=8: * * linux/fs/obdfilter/filter_log.c * * Copyright (c) 2001-2003 Cluster File Systems, Inc. * Author: Peter Braam * Author: Andreas Dilger * Author: Phil Schwan * * This file is part of the Lustre file system, http://www.lustre.org * Lustre is a trademark of Cluster File Systems, Inc. * * You may have signed or agreed to another license before downloading * this software. If so, you are bound by the terms and conditions * of that agreement, and the following does not apply to you. See the * LICENSE file included with this distribution for more information. * * If you did not agree to a different license, then this copy of Lustre * is open source software; you can redistribute it and/or modify it * under the terms of version 2 of the GNU General Public License as * published by the Free Software Foundation. * * In either case, Lustre 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 * license text for more details. */ #define DEBUG_SUBSYSTEM S_FILTER #ifndef AUTOCONF_INCLUDED #include #endif #include #include #include #include #include #include "filter_internal.h" /* Called with res->lr_lvb_sem held */ static int filter_lvbo_init(struct ldlm_resource *res) { struct ost_lvb *lvb = NULL; struct obd_device *obd; struct dentry *dentry; int rc = 0; ENTRY; LASSERT(res); LASSERT_SEM_LOCKED(&res->lr_lvb_sem); /* we only want lvb's for object resources */ /* check for internal locks: these have name[1] != 0 */ if (res->lr_name.name[1]) RETURN(0); if (res->lr_lvb_data) RETURN(0); OBD_ALLOC(lvb, sizeof(*lvb)); if (lvb == NULL) RETURN(-ENOMEM); res->lr_lvb_data = lvb; res->lr_lvb_len = sizeof(*lvb); obd = res->lr_namespace->ns_lvbp; LASSERT(obd != NULL); dentry = filter_fid2dentry(obd, NULL, res->lr_name.name[2], res->lr_name.name[0]); if (IS_ERR(dentry)) { rc = PTR_ERR(dentry); CERROR("%s: bad object "LPU64"/"LPU64": rc %d\n", obd->obd_name, res->lr_name.name[0], res->lr_name.name[1], rc); RETURN(rc); } if (dentry->d_inode == NULL) /* This is always true for test_brw */ GOTO(out_dentry, rc = -ENOENT); inode_init_lvb(dentry->d_inode, lvb); CDEBUG(D_DLMTRACE, "res: "LPU64" initial lvb size: "LPU64", " "mtime: "LPU64", blocks: "LPU64"\n", res->lr_name.name[0], lvb->lvb_size, lvb->lvb_mtime, lvb->lvb_blocks); EXIT; out_dentry: f_dput(dentry); /* Don't free lvb data on lookup error */ return rc; } /* This will be called in two ways: * * m != NULL : called by the DLM itself after a glimpse callback * m == NULL : called by the filter after a disk write * * If 'increase_only' is true, don't allow values to move backwards. */ static int filter_lvbo_update(struct ldlm_resource *res, struct lustre_msg *m, int buf_idx, int increase_only) { int rc = 0; struct ost_lvb *lvb; struct obd_device *obd; struct dentry *dentry; ENTRY; LASSERT(res); /* we only want lvb's for object resources */ /* check for internal locks: these have name[1] != 0 */ if (res->lr_name.name[1]) RETURN(0); down(&res->lr_lvb_sem); lvb = res->lr_lvb_data; if (lvb == NULL) { CERROR("No lvb when running lvbo_update!\n"); GOTO(out, rc = 0); } /* Update the LVB from the network message */ if (m != NULL) { struct ost_lvb *new; new = lustre_swab_buf(m, buf_idx, sizeof(*new), lustre_swab_ost_lvb); if (new == NULL) { CERROR("lustre_swab_buf failed\n"); goto disk_update; } if (new->lvb_size > lvb->lvb_size || !increase_only) { CDEBUG(D_DLMTRACE, "res: "LPU64" updating lvb size: " LPU64" -> "LPU64"\n", res->lr_name.name[0], lvb->lvb_size, new->lvb_size); lvb->lvb_size = new->lvb_size; } if (new->lvb_mtime > lvb->lvb_mtime || !increase_only) { CDEBUG(D_DLMTRACE, "res: "LPU64" updating lvb mtime: " LPU64" -> "LPU64"\n", res->lr_name.name[0], lvb->lvb_mtime, new->lvb_mtime); lvb->lvb_mtime = new->lvb_mtime; } if (new->lvb_atime > lvb->lvb_atime || !increase_only) { CDEBUG(D_DLMTRACE, "res: "LPU64" updating lvb atime: " LPU64" -> "LPU64"\n", res->lr_name.name[0], lvb->lvb_atime, new->lvb_atime); lvb->lvb_atime = new->lvb_atime; } if (new->lvb_ctime > lvb->lvb_ctime || !increase_only) { CDEBUG(D_DLMTRACE, "res: "LPU64" updating lvb ctime: " LPU64" -> "LPU64"\n", res->lr_name.name[0], lvb->lvb_ctime, new->lvb_ctime); lvb->lvb_ctime = new->lvb_ctime; } } disk_update: /* Update the LVB from the disk inode */ obd = res->lr_namespace->ns_lvbp; LASSERT(obd); dentry = filter_fid2dentry(obd, NULL, res->lr_name.name[2], res->lr_name.name[0]); if (IS_ERR(dentry)) GOTO(out, rc = PTR_ERR(dentry)); if (dentry->d_inode == NULL) GOTO(out_dentry, rc = -ENOENT); if (i_size_read(dentry->d_inode) > lvb->lvb_size || !increase_only) { CDEBUG(D_DLMTRACE, "res: "LPU64" updating lvb size from disk: " LPU64" -> %llu\n", res->lr_name.name[0], lvb->lvb_size, i_size_read(dentry->d_inode)); lvb->lvb_size = i_size_read(dentry->d_inode); } if (LTIME_S(dentry->d_inode->i_mtime) >lvb->lvb_mtime|| !increase_only){ CDEBUG(D_DLMTRACE, "res: "LPU64" updating lvb mtime from disk: " LPU64" -> %lu\n", res->lr_name.name[0], lvb->lvb_mtime, LTIME_S(dentry->d_inode->i_mtime)); lvb->lvb_mtime = LTIME_S(dentry->d_inode->i_mtime); } if (LTIME_S(dentry->d_inode->i_atime) >lvb->lvb_atime|| !increase_only){ CDEBUG(D_DLMTRACE, "res: "LPU64" updating lvb atime from disk: " LPU64" -> %lu\n", res->lr_name.name[0], lvb->lvb_atime, LTIME_S(dentry->d_inode->i_atime)); lvb->lvb_atime = LTIME_S(dentry->d_inode->i_atime); } if (LTIME_S(dentry->d_inode->i_ctime) >lvb->lvb_ctime|| !increase_only){ CDEBUG(D_DLMTRACE, "res: "LPU64" updating lvb ctime from disk: " LPU64" -> %lu\n", res->lr_name.name[0], lvb->lvb_ctime, LTIME_S(dentry->d_inode->i_ctime)); lvb->lvb_ctime = LTIME_S(dentry->d_inode->i_ctime); } if (lvb->lvb_blocks != dentry->d_inode->i_blocks) { CDEBUG(D_DLMTRACE,"res: "LPU64" updating lvb blocks from disk: " LPU64" -> %lu\n", res->lr_name.name[0], lvb->lvb_blocks, dentry->d_inode->i_blocks); lvb->lvb_blocks = dentry->d_inode->i_blocks; } out_dentry: f_dput(dentry); out: up(&res->lr_lvb_sem); return rc; } struct ldlm_valblock_ops filter_lvbo = { lvbo_init: filter_lvbo_init, lvbo_update: filter_lvbo_update };