+++ /dev/null
-/*
- * 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) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
- * Use is subject to license terms.
- *
- * Copyright (c) 2011, 2013, Intel Corporation.
- */
-/*
- * This file is part of Lustre, http://www.lustre.org/
- * Lustre is a trademark of Sun Microsystems, Inc.
- *
- * lustre/liblustre/rw.c
- *
- * Lustre Light block IO
- */
-
-#define DEBUG_SUBSYSTEM S_LLITE
-
-#include <assert.h>
-#include <errno.h>
-#include <fcntl.h>
-#include <stddef.h>
-#include <stdlib.h>
-#include <string.h>
-#include <time.h>
-#include <sys/stat.h>
-#include <sys/types.h>
-#include <sys/uio.h>
-#include <libcfs/libcfs.h>
-#include <lustre/lustre_idl.h>
-#include <liblustre.h>
-#include <cl_object.h>
-#include <lclient.h>
-#include <lustre_dlm.h>
-#include <obd.h>
-#include <obd_class.h>
-#include <obd_support.h>
-#include "llite_lib.h"
-
-int llu_merge_lvb(const struct lu_env *env, struct inode *inode)
-{
- struct llu_inode_info *lli = llu_i2info(inode);
- struct cl_object *obj = lli->lli_clob;
- struct intnl_stat *st = llu_i2stat(inode);
- struct cl_attr *attr = ccc_env_thread_attr(env);
- struct ost_lvb lvb;
- int rc;
- ENTRY;
-
- /* merge timestamps the most recently obtained from mds with
- timestamps obtained from osts */
- LTIME_S(inode->i_atime) = lli->lli_lvb.lvb_atime;
- LTIME_S(inode->i_mtime) = lli->lli_lvb.lvb_mtime;
- LTIME_S(inode->i_ctime) = lli->lli_lvb.lvb_ctime;
-
- inode_init_lvb(inode, &lvb);
-
- cl_object_attr_lock(obj);
- rc = cl_object_attr_get(env, obj, attr);
- cl_object_attr_unlock(obj);
- if (rc == 0) {
- if (lvb.lvb_atime < attr->cat_atime)
- lvb.lvb_atime = attr->cat_atime;
- if (lvb.lvb_ctime < attr->cat_ctime)
- lvb.lvb_ctime = attr->cat_ctime;
- if (lvb.lvb_mtime < attr->cat_mtime)
- lvb.lvb_mtime = attr->cat_mtime;
-
- st->st_size = lvb.lvb_size;
- st->st_blocks = lvb.lvb_blocks;
- st->st_mtime = lvb.lvb_mtime;
- st->st_atime = lvb.lvb_atime;
- st->st_ctime = lvb.lvb_ctime;
- }
-
- RETURN(rc);
-}
-
-static
-ssize_t llu_file_prwv(const struct iovec *iovec, int iovlen,
- _SYSIO_OFF_T pos, ssize_t len,
- void *private)
-{
- struct llu_io_session *session = (struct llu_io_session *) private;
- struct inode *inode = session->lis_inode;
- struct llu_inode_info *lli = llu_i2info(inode);
- int err;
- struct lu_env *env;
- struct cl_io *io;
- struct slp_io *sio;
- int refcheck;
- ENTRY;
-
- /* in a large iov read/write we'll be repeatedly called.
- * so give a chance to answer cancel ast here
- */
- liblustre_wait_event(0);
-
- if (len == 0 || iovlen == 0)
- RETURN(0);
-
- if (pos + len > lli->lli_maxbytes)
- RETURN(-ERANGE);
-
- env = cl_env_get(&refcheck);
- if (IS_ERR(env))
- RETURN(PTR_ERR(env));
-
- /* Do NOT call "ccc_env_thread_io()" again to prevent reinitializing */
- io = &ccc_env_info(env)->cti_io;
- if (cl_io_rw_init(env, io, session->lis_cmd == OBD_BRW_WRITE?CIT_WRITE:
- CIT_READ,
- pos, len) == 0) {
- struct ccc_io *cio;
- sio = slp_env_io(env);
- cio = ccc_env_io(env);
- /* XXX this is not right: cio->cui_iov can be modified. */
- cio->cui_iov = (struct iovec *)iovec;
- cio->cui_nrsegs = iovlen;
- cio->cui_tot_nrsegs = iovlen;
- sio->sio_session = session;
- err = cl_io_loop(env, io);
- } else {
- /* XXX WTF? */
- LBUG();
- }
- cl_io_fini(env, io);
- cl_env_put(env, &refcheck);
-
- if (err < 0)
- RETURN(err);
-
- RETURN(len);
-}
-
-static
-struct llu_io_session *get_io_session(struct inode *ino, int ngroups, int cmd)
-{
- struct llu_io_session *session;
-
- OBD_ALLOC_PTR(session);
- if (!session)
- return NULL;
-
- I_REF(ino);
- session->lis_inode = ino;
- session->lis_cmd = cmd;
- return session;
-}
-
-static void put_io_session(struct llu_io_session *session)
-{
- I_RELE(session->lis_inode);
- OBD_FREE_PTR(session);
-}
-
-static int llu_file_rwx(struct inode *ino,
- struct ioctx *ioctx,
- int read)
-{
- struct llu_io_session *session;
- ssize_t cc;
- int cmd = read ? OBD_BRW_READ : OBD_BRW_WRITE;
- ENTRY;
-
- LASSERT(ioctx->ioctx_iovlen > 0);
-
- liblustre_wait_event(0);
-
- if (ioctx->ioctx_xtvlen == 0)
- RETURN(0);
-
- /* XXX consider other types later */
- if (S_ISDIR(llu_i2stat(ino)->st_mode))
- RETURN(-EISDIR);
- if (!S_ISREG(llu_i2stat(ino)->st_mode))
- RETURN(-EOPNOTSUPP);
-
- session = get_io_session(ino, ioctx->ioctx_xtvlen * 2, cmd);
- if (!session)
- RETURN(-ENOMEM);
-
- cc = _sysio_enumerate_extents(ioctx->ioctx_xtv, ioctx->ioctx_xtvlen,
- ioctx->ioctx_iov, ioctx->ioctx_iovlen,
- llu_file_prwv, session);
-
- if (cc >= 0) {
- LASSERT(!ioctx->ioctx_cc);
- ioctx->ioctx_private = session;
- cc = 0;
- } else {
- put_io_session(session);
- }
-
- liblustre_wait_event(0);
- RETURN(cc);
-}
-
-void llu_io_init(struct cl_io *io, struct inode *inode, int write)
-{
- struct llu_inode_info *lli = llu_i2info(inode);
-
- io->u.ci_rw.crw_nonblock = lli->lli_open_flags & O_NONBLOCK;
- if (write)
- io->u.ci_wr.wr_append = lli->lli_open_flags & O_APPEND;
- io->ci_obj = llu_i2info(inode)->lli_clob;
-
- if ((lli->lli_open_flags & O_APPEND) && write)
- io->ci_lockreq = CILR_MANDATORY;
- else
- io->ci_lockreq = CILR_NEVER;
-}
-
-int llu_iop_read(struct inode *ino,
- struct ioctx *ioctx)
-{
- struct intnl_stat *st = llu_i2stat(ino);
- struct lu_env *env;
- struct cl_io *io;
- int refcheck;
- int ret;
-
- /* BUG: 5972 */
- st->st_atime = CFS_CURRENT_TIME;
-
- env = cl_env_get(&refcheck);
- if (IS_ERR(env))
- RETURN(PTR_ERR(env));
-
- io = ccc_env_thread_io(env);
- llu_io_init(io, ino, 0);
-
- ret = llu_file_rwx(ino, ioctx, 1);
-
- cl_env_put(env, &refcheck);
- return ret;
-}
-
-int llu_iop_write(struct inode *ino,
- struct ioctx *ioctx)
-{
- struct intnl_stat *st = llu_i2stat(ino);
- struct lu_env *env;
- struct cl_io *io;
- int refcheck;
- int ret;
-
- st->st_mtime = st->st_ctime = CFS_CURRENT_TIME;
-
- env = cl_env_get(&refcheck);
- if (IS_ERR(env))
- RETURN(PTR_ERR(env));
-
- io = ccc_env_thread_io(env);
- llu_io_init(io, ino, 1);
-
- ret = llu_file_rwx(ino, ioctx, 0);
- cl_env_put(env, &refcheck);
- return ret;
-}
-
-int llu_iop_iodone(struct ioctx *ioctx)
-{
- struct llu_io_session *session;
- struct lu_env *env;
- struct cl_io *io;
- int refcheck;
- ENTRY;
-
- liblustre_wait_event(0);
-
- env = cl_env_get(&refcheck);
- if (IS_ERR(env))
- RETURN(PTR_ERR(env));
-
- io = &ccc_env_info(env)->cti_io;
- cl_io_fini(env, io);
- cl_env_put(env, &refcheck);
- session = (struct llu_io_session *) ioctx->ioctx_private;
- LASSERT(session);
- LASSERT(!IS_ERR(session));
-
- if (session->lis_rc == 0) {
- ioctx->ioctx_cc = session->lis_rwcount;
- } else {
- LASSERT(session->lis_rc < 0);
- ioctx->ioctx_cc = -1;
- ioctx->ioctx_errno = -session->lis_rc;
- }
-
- put_io_session(session);
- ioctx->ioctx_private = NULL;
- liblustre_wait_event(0);
-
- RETURN(1);
-}
git://git.whamcloud.com / fs / lustre-release.git / blobdiff