mdt_open.c 48.39 KiB
/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
* vim:expandtab:shiftwidth=8:tabstop=8:
*
* linux/mdt/mdt_open.c
* Lustre Metadata Target (mdt) open/close file handling
*
* Copyright (C) 2002-2006 Cluster File Systems, Inc.
* Author: Huang Hua <huanghua@clusterfs.com>
*
* 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.
*/
#ifndef EXPORT_SYMTAB
# define EXPORT_SYMTAB
#endif
#define DEBUG_SUBSYSTEM S_MDS
#include <linux/lustre_acl.h>
#include <lustre_mds.h>
#include "mdt_internal.h"
/* we do nothing because we do not have refcount now */
static void mdt_mfd_get(void *mfdp)
{
}
/* Create a new mdt_file_data struct, initialize it,
* and insert it to global hash table */
struct mdt_file_data *mdt_mfd_new(void)
{
struct mdt_file_data *mfd;
ENTRY;
OBD_ALLOC_PTR(mfd);
if (mfd != NULL) {
INIT_LIST_HEAD(&mfd->mfd_handle.h_link);
INIT_LIST_HEAD(&mfd->mfd_list);
class_handle_hash(&mfd->mfd_handle, mdt_mfd_get);
}
RETURN(mfd);
}
/*
* Find the mfd pointed to by handle in global hash table.
* In case of replay the handle is obsoleted
* but mfd can be found in mfd list by that handle
*/
struct mdt_file_data *mdt_handle2mfd(struct mdt_thread_info *info,
const struct lustre_handle *handle)
{
struct ptlrpc_request *req = mdt_info_req(info);
struct mdt_file_data *mfd;
ENTRY;
LASSERT(handle != NULL);
mfd = class_handle2object(handle->cookie);
/* during dw/setattr replay the mfd can be found by old handle */
if (mfd == NULL &&
lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY) {
struct mdt_export_data *med = &req->rq_export->exp_mdt_data;
list_for_each_entry(mfd, &med->med_open_head, mfd_list) {
if (mfd->mfd_old_handle.cookie == handle->cookie)
RETURN (mfd);
}
mfd = NULL;
}
RETURN (mfd);
}
/* free mfd */
void mdt_mfd_free(struct mdt_file_data *mfd)
{
LASSERT(list_empty(&mfd->mfd_list));
OBD_FREE_RCU(mfd, sizeof *mfd, &mfd->mfd_handle);
}
static int mdt_create_data(struct mdt_thread_info *info,
struct mdt_object *p, struct mdt_object *o)
{
struct md_op_spec *spec = &info->mti_spec;
struct md_attr *ma = &info->mti_attr;
int rc;
ENTRY;
if ((spec->sp_cr_flags & MDS_OPEN_DELAY_CREATE) ||
!(spec->sp_cr_flags & FMODE_WRITE))
RETURN(0);
ma->ma_need = MA_INODE | MA_LOV;
ma->ma_valid = 0;
rc = mdo_create_data(info->mti_env,
p ? mdt_object_child(p) : NULL,
mdt_object_child(o), spec, ma);
RETURN(rc);
}
static int mdt_epoch_opened(struct mdt_object *mo)
{
return mo->mot_epochcount;
}
int mdt_sizeonmds_enabled(struct mdt_object *mo)
{
return !mo->mot_ioepoch;
}
/* Re-enable Size-on-MDS. */
void mdt_sizeonmds_enable(struct mdt_thread_info *info,
struct mdt_object *mo)
{
spin_lock(&info->mti_mdt->mdt_ioepoch_lock);
if (info->mti_epoch->ioepoch == mo->mot_ioepoch) {
LASSERT(!mdt_epoch_opened(mo));
mo->mot_ioepoch = 0;
mo->mot_flags = 0;
}
spin_unlock(&info->mti_mdt->mdt_ioepoch_lock);
}
/* Open the epoch. Epoch open is allowed if @writecount is not negative.
* The epoch and writecount handling is performed under the mdt_ioepoch_lock. */
int mdt_epoch_open(struct mdt_thread_info *info, struct mdt_object *o)
{
struct mdt_device *mdt = info->mti_mdt; int cancel = 0;
int rc = 0;
ENTRY;
if (!(mdt_conn_flags(info) & OBD_CONNECT_SOM) ||
!S_ISREG(lu_object_attr(&o->mot_obj.mo_lu)))
RETURN(0);
spin_lock(&mdt->mdt_ioepoch_lock);
if (mdt_epoch_opened(o)) {
/* Epoch continues even if there is no writers yet. */
CDEBUG(D_INODE, "continue epoch "LPU64" for "DFID"\n",
o->mot_ioepoch, PFID(mdt_object_fid(o)));
} else {
if (info->mti_replayepoch > mdt->mdt_ioepoch)
mdt->mdt_ioepoch = info->mti_replayepoch;
else
mdt->mdt_ioepoch++;
o->mot_ioepoch = info->mti_replayepoch ?
info->mti_replayepoch : mdt->mdt_ioepoch;
CDEBUG(D_INODE, "starting epoch "LPU64" for "DFID"\n",
mdt->mdt_ioepoch, PFID(mdt_object_fid(o)));
cancel = 1;
}
o->mot_epochcount++;
spin_unlock(&mdt->mdt_ioepoch_lock);
/* Cancel Size-on-MDS attributes on clients if not truncate.
* In the later case, mdt_reint_setattr will do it. */
if (cancel && (info->mti_rr.rr_fid1 != NULL)) {
struct mdt_lock_handle *lh = &info->mti_lh[MDT_LH_CHILD];
mdt_lock_reg_init(lh, LCK_EX);
rc = mdt_object_lock(info, o, lh, MDS_INODELOCK_UPDATE,
MDT_LOCAL_LOCK);
if (rc == 0)
mdt_object_unlock(info, o, lh, 1);
}
RETURN(rc);
}
/* Update the on-disk attributes if needed and re-enable Size-on-MDS caching. */
static int mdt_sizeonmds_update(struct mdt_thread_info *info,
struct mdt_object *o)
{
ENTRY;
CDEBUG(D_INODE, "Closing epoch "LPU64" on "DFID". Count %d\n",
o->mot_ioepoch, PFID(mdt_object_fid(o)), o->mot_epochcount);
if (info->mti_attr.ma_attr.la_valid & LA_SIZE) {
/* Do Size-on-MDS attribute update.
* Size-on-MDS is re-enabled inside. */
/* XXX: since we have opened the file, it is unnecessary
* to check permission when close it. Between the "open"
* and "close", maybe someone has changed the file mode
* or flags, or the file created mode do not permit wirte,
* and so on. Just set MDS_PERM_BYPASS for all the cases. */
info->mti_attr.ma_attr_flags |= MDS_PERM_BYPASS;
info->mti_attr.ma_attr.la_valid &= LA_SIZE | LA_BLOCKS |
LA_ATIME | LA_MTIME | LA_CTIME;
RETURN(mdt_attr_set(info, o, 0));
} else
mdt_sizeonmds_enable(info, o);
RETURN(0);
}
/* Epoch closes.
* Returns 1 if epoch does not close.
* Returns 0 if epoch closes.
* Returns -EAGAIN if epoch closes but an Size-on-MDS Update is still needed * from the client. */
static int mdt_epoch_close(struct mdt_thread_info *info, struct mdt_object *o)
{
int eviction = (mdt_info_req(info) == NULL ? 1 : 0);
struct lu_attr *la = &info->mti_attr.ma_attr;
int achange = 0;
int opened;
int rc = 1;
ENTRY;
if (!(mdt_conn_flags(info) & OBD_CONNECT_SOM) ||
!S_ISREG(lu_object_attr(&o->mot_obj.mo_lu)))
RETURN(0);
spin_lock(&info->mti_mdt->mdt_ioepoch_lock);
/* Epoch closes only if client tells about it or eviction occures. */
if (eviction || (info->mti_epoch->flags & MF_EPOCH_CLOSE)) {
LASSERT(o->mot_epochcount);
o->mot_epochcount--;
CDEBUG(D_INODE, "Closing epoch "LPU64" on "DFID". Count %d\n",
o->mot_ioepoch, PFID(mdt_object_fid(o)),
o->mot_epochcount);
if (!eviction)
achange = (info->mti_epoch->flags & MF_SOM_CHANGE);
rc = 0;
if (!eviction && !mdt_epoch_opened(o)) {
/* Epoch ends. Is an Size-on-MDS update needed? */
if (o->mot_flags & MF_SOM_CHANGE) {
/* Some previous writer changed the attribute.
* Do not believe to the current Size-on-MDS
* update, re-ask client. */
rc = -EAGAIN;
} else if (!(la->la_valid & LA_SIZE) && achange) {
/* Attributes were changed by the last writer
* only but no Size-on-MDS update is received.*/
rc = -EAGAIN;
}
}
if (achange || eviction)
o->mot_flags |= MF_SOM_CHANGE;
}
opened = mdt_epoch_opened(o);
spin_unlock(&info->mti_mdt->mdt_ioepoch_lock);
/* If eviction occurred, do nothing. */
if ((rc == 0) && !opened && !eviction) {
/* Epoch ends and wanted Size-on-MDS update is obtained. */
rc = mdt_sizeonmds_update(info, o);
/* Avoid the following setattrs of these attributes, e.g.
* for atime update. */
info->mti_attr.ma_valid = 0;
}
RETURN(rc);
}
int mdt_write_read(struct mdt_device *mdt, struct mdt_object *o)
{
int rc = 0;
ENTRY;
spin_lock(&mdt->mdt_ioepoch_lock);
rc = o->mot_writecount;
spin_unlock(&mdt->mdt_ioepoch_lock);
RETURN(rc);
}
int mdt_write_get(struct mdt_device *mdt, struct mdt_object *o)
{
int rc = 0;
ENTRY;
spin_lock(&mdt->mdt_ioepoch_lock);
if (o->mot_writecount < 0)
rc = -ETXTBSY;
else
o->mot_writecount++;
spin_unlock(&mdt->mdt_ioepoch_lock);
RETURN(rc);
}
static void mdt_write_put(struct mdt_device *mdt, struct mdt_object *o)
{
ENTRY;
spin_lock(&mdt->mdt_ioepoch_lock);
o->mot_writecount--;
spin_unlock(&mdt->mdt_ioepoch_lock);
EXIT;
}
static int mdt_write_deny(struct mdt_device *mdt, struct mdt_object *o)
{
int rc = 0;
ENTRY;
spin_lock(&mdt->mdt_ioepoch_lock);
if (o->mot_writecount > 0)
rc = -ETXTBSY;
else
o->mot_writecount--;
spin_unlock(&mdt->mdt_ioepoch_lock);
RETURN(rc);
}
static void mdt_write_allow(struct mdt_device *mdt, struct mdt_object *o)
{
ENTRY;
spin_lock(&mdt->mdt_ioepoch_lock);
o->mot_writecount++;
spin_unlock(&mdt->mdt_ioepoch_lock);
EXIT;
}
/* there can be no real transaction so prepare the fake one */
static void mdt_empty_transno(struct mdt_thread_info* info)
{
struct mdt_device *mdt = info->mti_mdt;
struct ptlrpc_request *req = mdt_info_req(info);
ENTRY;
/* transaction is occured already */
if (lustre_msg_get_transno(req->rq_repmsg) != 0) {
EXIT;
return;
}
spin_lock(&mdt->mdt_transno_lock);
if (info->mti_transno == 0) {
info->mti_transno = ++ mdt->mdt_last_transno;
} else {
/* should be replay */
if (info->mti_transno > mdt->mdt_last_transno)
mdt->mdt_last_transno = info->mti_transno;
}
spin_unlock(&mdt->mdt_transno_lock);
CDEBUG(D_INODE, "transno = %llu, last_committed = %llu\n",
info->mti_transno, req->rq_export->exp_obd->obd_last_committed);
req->rq_transno = info->mti_transno;
lustre_msg_set_transno(req->rq_repmsg, info->mti_transno);
lustre_msg_set_last_xid(req->rq_repmsg, req->rq_xid);
EXIT;
}
void mdt_mfd_set_mode(struct mdt_file_data *mfd, int mode)
{
LASSERT(mfd != NULL);
CDEBUG(D_HA, "Change mfd %p mode 0x%x->0x%x\n",
mfd, (unsigned int)mfd->mfd_mode, (unsigned int)mode);
mfd->mfd_mode = mode;
}
static int mdt_mfd_open(struct mdt_thread_info *info, struct mdt_object *p,
struct mdt_object *o, int flags, int created)
{
struct ptlrpc_request *req = mdt_info_req(info);
struct mdt_export_data *med = &req->rq_export->exp_mdt_data;
struct mdt_file_data *mfd;
struct md_attr *ma = &info->mti_attr;
struct lu_attr *la = &ma->ma_attr;
struct mdt_body *repbody;
int rc = 0, isdir, isreg;
ENTRY;
repbody = req_capsule_server_get(&info->mti_pill, &RMF_MDT_BODY);
isreg = S_ISREG(la->la_mode);
isdir = S_ISDIR(la->la_mode);
if ((isreg && !(ma->ma_valid & MA_LOV))) {
/*
* No EA, check whether it is will set regEA and dirEA since in
* above attr get, these size might be zero, so reset it, to
* retrieve the MD after create obj.
*/
ma->ma_lmm_size = req_capsule_get_size(&info->mti_pill,
&RMF_MDT_MD,
RCL_SERVER);
/* in replay case, p == NULL */
rc = mdt_create_data(info, p, o);
if (rc)
RETURN(rc);
}
CDEBUG(D_INODE, "after open, ma_valid bit = "LPX64" lmm_size = %d\n",
ma->ma_valid, ma->ma_lmm_size);
if (ma->ma_valid & MA_LOV) {
LASSERT(ma->ma_lmm_size != 0);
repbody->eadatasize = ma->ma_lmm_size;
if (isdir)
repbody->valid |= OBD_MD_FLDIREA;
else
repbody->valid |= OBD_MD_FLEASIZE;
}
if (flags & FMODE_WRITE) {
rc = mdt_write_get(info->mti_mdt, o);
if (rc == 0) {
mdt_epoch_open(info, o);
repbody->ioepoch = o->mot_ioepoch;
}
} else if (flags & MDS_FMODE_EXEC) {
rc = mdt_write_deny(info->mti_mdt, o);
} if (rc)
RETURN(rc);
rc = mo_open(info->mti_env, mdt_object_child(o),
created ? flags | MDS_OPEN_CREATED : flags);
if (rc)
RETURN(rc);
mfd = mdt_mfd_new();
if (mfd != NULL) {
/*
* Keep a reference on this object for this open, and is
* released by mdt_mfd_close().
*/
mdt_object_get(info->mti_env, o);
/*
* @flags is always not zero. At least it should be FMODE_READ,
* FMODE_WRITE or FMODE_EXEC.
*/
LASSERT(flags != 0);
/* Open handling. */
mdt_mfd_set_mode(mfd, flags);
mfd->mfd_object = o;
mfd->mfd_xid = req->rq_xid;
/* replay handle */
if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY) {
struct mdt_file_data *old_mfd;
/* Check wheather old cookie already exist in
* the list, becasue when do recovery, client
* might be disconnected from server, and
* restart replay, so there maybe some orphan
* mfd here, we should remove them */
LASSERT(info->mti_rr.rr_handle != NULL);
old_mfd = mdt_handle2mfd(info, info->mti_rr.rr_handle);
if (old_mfd) {
CDEBUG(D_HA, "del orph mfd %p cookie" LPX64"\n",
mfd, info->mti_rr.rr_handle->cookie);
spin_lock(&med->med_open_lock);
class_handle_unhash(&old_mfd->mfd_handle);
list_del_init(&old_mfd->mfd_list);
spin_unlock(&med->med_open_lock);
mdt_mfd_free(old_mfd);
}
CDEBUG(D_HA, "Store old cookie "LPX64" in new mfd\n",
info->mti_rr.rr_handle->cookie);
mfd->mfd_old_handle.cookie =
info->mti_rr.rr_handle->cookie;
}
spin_lock(&med->med_open_lock);
list_add(&mfd->mfd_list, &med->med_open_head);
spin_unlock(&med->med_open_lock);
repbody->handle.cookie = mfd->mfd_handle.h_cookie;
mdt_empty_transno(info);
} else
rc = -ENOMEM;
RETURN(rc);
}
static int mdt_finish_open(struct mdt_thread_info *info,
struct mdt_object *p, struct mdt_object *o,
int flags, int created, struct ldlm_reply *rep)
{
struct ptlrpc_request *req = mdt_info_req(info); struct mdt_export_data *med = &req->rq_export->exp_mdt_data;
struct mdt_device *mdt = info->mti_mdt;
struct md_attr *ma = &info->mti_attr;
struct lu_attr *la = &ma->ma_attr;
struct mdt_file_data *mfd;
struct mdt_body *repbody;
int rc = 0;
int isreg, isdir, islnk;
struct list_head *t;
ENTRY;
LASSERT(ma->ma_valid & MA_INODE);
repbody = req_capsule_server_get(&info->mti_pill, &RMF_MDT_BODY);
isreg = S_ISREG(la->la_mode);
isdir = S_ISDIR(la->la_mode);
islnk = S_ISLNK(la->la_mode);
mdt_pack_attr2body(info, repbody, la, mdt_object_fid(o));
if (med->med_rmtclient) {
void *buf = req_capsule_server_get(&info->mti_pill, &RMF_ACL);
rc = mdt_pack_remote_perm(info, o, buf);
if (rc) {
repbody->valid &= ~OBD_MD_FLRMTPERM;
repbody->aclsize = 0;
} else {
repbody->valid |= OBD_MD_FLRMTPERM;
repbody->aclsize = sizeof(struct mdt_remote_perm);
}
}
#ifdef CONFIG_FS_POSIX_ACL
else if (req->rq_export->exp_connect_flags & OBD_CONNECT_ACL) {
const struct lu_env *env = info->mti_env;
struct md_object *next = mdt_object_child(o);
struct lu_buf *buf = &info->mti_buf;
buf->lb_buf = req_capsule_server_get(&info->mti_pill, &RMF_ACL);
buf->lb_len = req_capsule_get_size(&info->mti_pill, &RMF_ACL,
RCL_SERVER);
if (buf->lb_len > 0) {
rc = mo_xattr_get(env, next, buf,
XATTR_NAME_ACL_ACCESS);
if (rc < 0) {
if (rc == -ENODATA) {
repbody->aclsize = 0;
repbody->valid |= OBD_MD_FLACL;
rc = 0;
} else if (rc == -EOPNOTSUPP) {
rc = 0;
} else {
CERROR("got acl size: %d\n", rc);
}
} else {
repbody->aclsize = rc;
repbody->valid |= OBD_MD_FLACL;
rc = 0;
}
}
}
#endif
if (mdt->mdt_opts.mo_mds_capa) {
struct lustre_capa *capa;
capa = req_capsule_server_get(&info->mti_pill, &RMF_CAPA1);
LASSERT(capa);
capa->lc_opc = CAPA_OPC_MDS_DEFAULT;
capa->lc_uid = 0; rc = mo_capa_get(info->mti_env, mdt_object_child(o), capa, 0);
if (rc)
RETURN(rc);
repbody->valid |= OBD_MD_FLMDSCAPA;
}
if (mdt->mdt_opts.mo_oss_capa &&
S_ISREG(lu_object_attr(&o->mot_obj.mo_lu))) {
struct lustre_capa *capa;
capa = req_capsule_server_get(&info->mti_pill, &RMF_CAPA2);
LASSERT(capa);
capa->lc_opc = CAPA_OPC_OSS_DEFAULT | capa_open_opc(flags);
capa->lc_uid = 0;
rc = mo_capa_get(info->mti_env, mdt_object_child(o), capa, 0);
if (rc)
RETURN(rc);
repbody->valid |= OBD_MD_FLOSSCAPA;
}
/*
* If we are following a symlink, don't open; and do not return open
* handle for special nodes as client required.
*/
if (islnk || (!isreg && !isdir &&
(req->rq_export->exp_connect_flags & OBD_CONNECT_NODEVOH))) {
lustre_msg_set_transno(req->rq_repmsg, 0);
RETURN(0);
}
mdt_set_disposition(info, rep, DISP_OPEN_OPEN);
/*
* We need to return the existing object's fid back, so it is done here,
* after preparing the reply.
*/
if (!created && (flags & MDS_OPEN_EXCL) && (flags & MDS_OPEN_CREAT))
RETURN(-EEXIST);
/* This can't be done earlier, we need to return reply body */
if (isdir) {
if (flags & (MDS_OPEN_CREAT | FMODE_WRITE)) {
/* We are trying to create or write an existing dir. */
RETURN(-EISDIR);
}
} else if (flags & MDS_OPEN_DIRECTORY)
RETURN(-ENOTDIR);
if (MDT_FAIL_CHECK(OBD_FAIL_MDS_OPEN_CREATE)) {
obd_fail_loc = OBD_FAIL_LDLM_REPLY | OBD_FAIL_ONCE;
RETURN(-EAGAIN);
}
mfd = NULL;
if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_RESENT) {
spin_lock(&med->med_open_lock);
list_for_each(t, &med->med_open_head) {
mfd = list_entry(t, struct mdt_file_data, mfd_list);
if (mfd->mfd_xid == req->rq_xid) {
break;
}
mfd = NULL;
}
spin_unlock(&med->med_open_lock);
if (mfd != NULL) {
repbody->handle.cookie = mfd->mfd_handle.h_cookie;
/*set repbody->ea_size for resent case*/
if (ma->ma_valid & MA_LOV) {
LASSERT(ma->ma_lmm_size != 0);
repbody->eadatasize = ma->ma_lmm_size; if (isdir)
repbody->valid |= OBD_MD_FLDIREA;
else
repbody->valid |= OBD_MD_FLEASIZE;
}
RETURN(0);
}
}
rc = mdt_mfd_open(info, p, o, flags, created);
RETURN(rc);
}
extern void mdt_req_from_mcd(struct ptlrpc_request *req,
struct mdt_client_data *mcd);
void mdt_reconstruct_open(struct mdt_thread_info *info,
struct mdt_lock_handle *lhc)
{
const struct lu_env *env = info->mti_env;
struct mdt_device *mdt = info->mti_mdt;
struct req_capsule *pill = &info->mti_pill;
struct ptlrpc_request *req = mdt_info_req(info);
struct mdt_export_data *med = &req->rq_export->exp_mdt_data;
struct mdt_client_data *mcd = med->med_mcd;
struct md_attr *ma = &info->mti_attr;
struct mdt_reint_record *rr = &info->mti_rr;
__u32 flags = info->mti_spec.sp_cr_flags;
struct ldlm_reply *ldlm_rep;
struct mdt_object *parent;
struct mdt_object *child;
struct mdt_body *repbody;
int rc;
ENTRY;
LASSERT(pill->rc_fmt == &RQF_LDLM_INTENT_OPEN);
ldlm_rep = req_capsule_server_get(pill, &RMF_DLM_REP);
repbody = req_capsule_server_get(pill, &RMF_MDT_BODY);
ma->ma_lmm = req_capsule_server_get(pill, &RMF_MDT_MD);
ma->ma_lmm_size = req_capsule_get_size(pill, &RMF_MDT_MD,
RCL_SERVER);
ma->ma_need = MA_INODE | MA_LOV;
ma->ma_valid = 0;
mdt_req_from_mcd(req, med->med_mcd);
mdt_set_disposition(info, ldlm_rep, mcd->mcd_last_data);
CERROR("This is reconstruct open: disp="LPX64", result=%d\n",
ldlm_rep->lock_policy_res1, req->rq_status);
if (mdt_get_disposition(ldlm_rep, DISP_OPEN_CREATE) &&
req->rq_status != 0) {
/* We did not create successfully, return error to client. */
mdt_shrink_reply(info);
GOTO(out, rc = req->rq_status);
}
if (mdt_get_disposition(ldlm_rep, DISP_OPEN_CREATE)) {
/*
* We failed after creation, but we do not know in which step
* we failed. So try to check the child object.
*/
parent = mdt_object_find(env, mdt, rr->rr_fid1);
LASSERT(!IS_ERR(parent));
child = mdt_object_find(env, mdt, rr->rr_fid2);
LASSERT(!IS_ERR(child));
rc = mdt_object_exists(child); if (rc > 0) {
struct md_object *next;
mdt_set_capainfo(info, 1, rr->rr_fid2, BYPASS_CAPA);
next = mdt_object_child(child);
rc = mo_attr_get(env, next, ma);
if (rc == 0)
rc = mdt_finish_open(info, parent, child,
flags, 1, ldlm_rep);
} else if (rc < 0) {
/* the child object was created on remote server */
repbody->fid1 = *rr->rr_fid2;
repbody->valid |= (OBD_MD_FLID | OBD_MD_MDS);
rc = 0;
} else if (rc == 0) {
/* the child does not exist, we should do regular open */
mdt_object_put(env, parent);
mdt_object_put(env, child);
GOTO(regular_open, 0);
}
mdt_object_put(env, parent);
mdt_object_put(env, child);
mdt_shrink_reply(info);
GOTO(out, rc);
} else {
regular_open:
/* We did not try to create, so we are a pure open */
rc = mdt_reint_open(info, lhc);
}
EXIT;
out:
req->rq_status = rc;
lustre_msg_set_status(req->rq_repmsg, req->rq_status);
LASSERT(ergo(rc < 0, lustre_msg_get_transno(req->rq_repmsg) == 0));
}
static int mdt_open_by_fid(struct mdt_thread_info* info,
struct ldlm_reply *rep)
{
const struct lu_env *env = info->mti_env;
__u32 flags = info->mti_spec.sp_cr_flags;
struct mdt_reint_record *rr = &info->mti_rr;
struct md_attr *ma = &info->mti_attr;
struct mdt_object *o;
int rc;
ENTRY;
LASSERT(info->mti_spec.u.sp_ea.no_lov_create);
o = mdt_object_find(info->mti_env, info->mti_mdt, rr->rr_fid2);
if (IS_ERR(o))
RETURN(rc = PTR_ERR(o));
rc = mdt_object_exists(o);
if (rc > 0) {
mdt_set_disposition(info, rep, (DISP_IT_EXECD |
DISP_LOOKUP_EXECD |
DISP_LOOKUP_POS));
rc = mo_attr_get(env, mdt_object_child(o), ma);
if (rc == 0)
rc = mdt_mfd_open(info, NULL, o, flags, 0);
} else if (rc == 0) {
rc = -ENOENT;
} else {
/* the child object was created on remote server */
struct mdt_body *repbody;
repbody = req_capsule_server_get(&info->mti_pill, &RMF_MDT_BODY);
repbody->fid1 = *rr->rr_fid2;
repbody->valid |= (OBD_MD_FLID | OBD_MD_MDS); rc = 0;
}
mdt_object_put(info->mti_env, o);
RETURN(rc);
}
int mdt_pin(struct mdt_thread_info* info)
{
ENTRY;
RETURN(err_serious(-EOPNOTSUPP));
}
/* Cross-ref request. Currently it can only be a pure open (w/o create) */
static int mdt_cross_open(struct mdt_thread_info* info,
const struct lu_fid *fid,
struct ldlm_reply *rep, __u32 flags)
{
struct md_attr *ma = &info->mti_attr;
struct mdt_object *o;
int rc;
ENTRY;
o = mdt_object_find(info->mti_env, info->mti_mdt, fid);
if (IS_ERR(o))
RETURN(rc = PTR_ERR(o));
rc = mdt_object_exists(o);
if (rc > 0) {
/* Do permission check for cross-open. */
rc = mo_permission(info->mti_env, NULL, mdt_object_child(o),
NULL, flags | MDS_OPEN_CROSS);
if (rc)
goto out;
mdt_set_capainfo(info, 0, fid, BYPASS_CAPA);
rc = mo_attr_get(info->mti_env, mdt_object_child(o), ma);
if (rc == 0)
rc = mdt_finish_open(info, NULL, o, flags, 0, rep);
} else if (rc == 0) {
/*
* Something is wrong here. lookup was positive but there is
* no object!
*/
CERROR("Cross-ref object doesn't exist!\n");
rc = -EFAULT;
} else {
/* Something is wrong here, the object is on another MDS! */
CERROR("The object isn't on this server! FLD error?\n");
LU_OBJECT_DEBUG(D_WARNING, info->mti_env,
&o->mot_obj.mo_lu,
"Object isn't on this server! FLD error?\n");
rc = -EFAULT;
}
out:
mdt_object_put(info->mti_env, o);
RETURN(rc);
}
int mdt_reint_open(struct mdt_thread_info *info, struct mdt_lock_handle *lhc)
{
struct mdt_device *mdt = info->mti_mdt;
struct ptlrpc_request *req = mdt_info_req(info);
struct mdt_object *parent;
struct mdt_object *child;
struct mdt_lock_handle *lh;
struct ldlm_reply *ldlm_rep;
struct mdt_body *repbody; struct lu_fid *child_fid = &info->mti_tmp_fid1;
struct md_attr *ma = &info->mti_attr;
__u32 create_flags = info->mti_spec.sp_cr_flags;
struct mdt_reint_record *rr = &info->mti_rr;
struct lu_name *lname;
int result;
int created = 0;
ENTRY;
OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_PAUSE_OPEN | OBD_FAIL_ONCE,
(obd_timeout + 1) / 4);
repbody = req_capsule_server_get(&info->mti_pill, &RMF_MDT_BODY);
ma->ma_lmm = req_capsule_server_get(&info->mti_pill, &RMF_MDT_MD);
ma->ma_lmm_size = req_capsule_get_size(&info->mti_pill, &RMF_MDT_MD,
RCL_SERVER);
ma->ma_need = MA_INODE | MA_LOV;
ma->ma_valid = 0;
LASSERT(info->mti_pill.rc_fmt == &RQF_LDLM_INTENT_OPEN);
ldlm_rep = req_capsule_server_get(&info->mti_pill, &RMF_DLM_REP);
/* TODO: JOIN file */
if (create_flags & MDS_OPEN_JOIN_FILE) {
CERROR("JOIN file will be supported soon\n");
GOTO(out, result = err_serious(-EOPNOTSUPP));
}
CDEBUG(D_INODE, "I am going to open "DFID"/(%s->"DFID") "
"cr_flag=0%o mode=0%06o msg_flag=0x%x\n",
PFID(rr->rr_fid1), rr->rr_name,
PFID(rr->rr_fid2), create_flags,
ma->ma_attr.la_mode, lustre_msg_get_flags(req->rq_reqmsg));
if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY) {
/* This is a replay request. */
result = mdt_open_by_fid(info, ldlm_rep);
if (result != -ENOENT)
GOTO(out, result);
/*
* We didn't find the correct object, so we need to re-create it
* via a regular replay.
*/
if (!(create_flags & MDS_OPEN_CREAT)) {
DEBUG_REQ(D_ERROR, req,"OPEN & CREAT not in open replay.");
GOTO(out, result = -EFAULT);
}
CDEBUG(D_INFO, "Open replay did find object, continue as "
"regular open\n");
}
if (MDT_FAIL_CHECK(OBD_FAIL_MDS_OPEN_PACK))
GOTO(out, result = err_serious(-ENOMEM));
mdt_set_disposition(info, ldlm_rep,
(DISP_IT_EXECD | DISP_LOOKUP_EXECD));
if (info->mti_cross_ref) {
/* This is cross-ref open */
mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_POS);
result = mdt_cross_open(info, rr->rr_fid1, ldlm_rep,
create_flags);
GOTO(out, result);
}
lh = &info->mti_lh[MDT_LH_PARENT];
mdt_lock_pdo_init(lh, (create_flags & MDS_OPEN_CREAT) ? LCK_PW : LCK_PR, rr->rr_name, rr->rr_namelen);
parent = mdt_object_find_lock(info, rr->rr_fid1, lh,
MDS_INODELOCK_UPDATE);
if (IS_ERR(parent))
GOTO(out, result = PTR_ERR(parent));
fid_zero(child_fid);
lname = mdt_name(info->mti_env, (char *)rr->rr_name, rr->rr_namelen);
result = mdo_lookup(info->mti_env, mdt_object_child(parent),
lname, child_fid, &info->mti_spec);
LASSERTF(ergo(result == 0, fid_is_sane(child_fid)),
"looking for "DFID"/%s, result fid="DFID"\n",
PFID(mdt_object_fid(parent)), rr->rr_name, PFID(child_fid));
if (result != 0 && result != -ENOENT && result != -ESTALE)
GOTO(out_parent, result);
if (result == -ENOENT || result == -ESTALE) {
mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_NEG);
if (result == -ESTALE) {
/*
* -ESTALE means the parent is a dead(unlinked) dir, so
* it should return -ENOENT to in accordance with the
* original mds implementaion.
*/
GOTO(out_parent, result = -ENOENT);
}
if (!(create_flags & MDS_OPEN_CREAT))
GOTO(out_parent, result);
*child_fid = *info->mti_rr.rr_fid2;
LASSERTF(fid_is_sane(child_fid), "fid="DFID"\n",
PFID(child_fid));
} else {
/*
* Check for O_EXCL is moved to the mdt_finish_open(), we need to
* return FID back in that case.
*/
mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_POS);
}
child = mdt_object_find(info->mti_env, mdt, child_fid);
if (IS_ERR(child))
GOTO(out_parent, result = PTR_ERR(child));
mdt_set_capainfo(info, 1, child_fid, BYPASS_CAPA);
if (result == -ENOENT) {
/* Not found and with MDS_OPEN_CREAT: let's create it. */
mdt_set_disposition(info, ldlm_rep, DISP_OPEN_CREATE);
/* Let lower layers know what is lock mode on directory. */
info->mti_spec.sp_cr_mode =
mdt_dlm_mode2mdl_mode(lh->mlh_pdo_mode);
/*
* Do not perform lookup sanity check. We know that name does
* not exist.
*/
info->mti_spec.sp_cr_lookup = 0;
result = mdo_create(info->mti_env,
mdt_object_child(parent),
lname,
mdt_object_child(child),
&info->mti_spec,
&info->mti_attr);
if (result == -ERESTART) {
mdt_clear_disposition(info, ldlm_rep, DISP_OPEN_CREATE); GOTO(out_child, result);
} else {
if (result != 0)
GOTO(out_child, result);
}
created = 1;
} else {
/* We have to get attr & lov ea for this object */
result = mo_attr_get(info->mti_env, mdt_object_child(child),
ma);
/*
* The object is on remote node, return its FID for remote open.
*/
if (result == -EREMOTE) {
int rc;
/*
* Check if this lock already was sent to client and
* this is resent case. For resent case do not take lock
* again, use what is already granted.
*/
LASSERT(lhc != NULL);
if (lustre_handle_is_used(&lhc->mlh_reg_lh)) {
struct ldlm_lock *lock;
LASSERT(lustre_msg_get_flags(req->rq_reqmsg) &
MSG_RESENT);
lock = ldlm_handle2lock(&lhc->mlh_reg_lh);
if (!lock) {
CERROR("Invalid lock handle "LPX64"\n",
lhc->mlh_reg_lh.cookie);
LBUG();
}
LASSERT(fid_res_name_eq(mdt_object_fid(child),
&lock->l_resource->lr_name));
LDLM_LOCK_PUT(lock);
rc = 0;
} else {
mdt_lock_handle_init(lhc);
mdt_lock_reg_init(lhc, LCK_PR);
rc = mdt_object_lock(info, child, lhc,
MDS_INODELOCK_LOOKUP,
MDT_CROSS_LOCK);
}
repbody->fid1 = *mdt_object_fid(child);
repbody->valid |= (OBD_MD_FLID | OBD_MD_MDS);
if (rc != 0)
result = rc;
GOTO(out_child, result);
}
}
/* Try to open it now. */
result = mdt_finish_open(info, parent, child, create_flags,
created, ldlm_rep);
if (result != 0 && created) {
int rc2;
ma->ma_need = 0;
ma->ma_valid = 0;
ma->ma_cookie_size = 0;
info->mti_no_need_trans = 1;
rc2 = mdo_unlink(info->mti_env,
mdt_object_child(parent),
mdt_object_child(child),
lname,
&info->mti_attr); if (rc2 != 0)
CERROR("Error in cleanup of open\n");
}
EXIT;
out_child:
mdt_object_put(info->mti_env, child);
out_parent:
mdt_object_unlock_put(info, parent, lh, result);
out:
mdt_shrink_reply(info);
if (result)
lustre_msg_set_transno(req->rq_repmsg, 0);
return result;
}
#define MFD_CLOSED(mode) (((mode) & ~(FMODE_EPOCH | FMODE_SOM | \
FMODE_EPOCHLCK)) == FMODE_CLOSED)
static int mdt_mfd_closed(struct mdt_file_data *mfd)
{
return ((mfd == NULL) || MFD_CLOSED(mfd->mfd_mode));
}
int mdt_mfd_close(struct mdt_thread_info *info, struct mdt_file_data *mfd)
{
struct mdt_object *o = mfd->mfd_object;
struct md_object *next = mdt_object_child(o);
struct md_attr *ma = &info->mti_attr;
int rc = 0, ret = 0;
int mode;
ENTRY;
mode = mfd->mfd_mode;
if ((mode & FMODE_WRITE) || (mode & FMODE_EPOCHLCK)) {
mdt_write_put(info->mti_mdt, o);
ret = mdt_epoch_close(info, o);
} else if (mode & MDS_FMODE_EXEC) {
mdt_write_allow(info->mti_mdt, o);
} else if (mode & FMODE_EPOCH) {
ret = mdt_epoch_close(info, o);
}
/* Update atime on close only. */
if ((mode & MDS_FMODE_EXEC || mode & FMODE_READ || mode & FMODE_WRITE)
&& (ma->ma_valid & MA_INODE) && (ma->ma_attr.la_valid & LA_ATIME)) {
/* Set the atime only. */
ma->ma_attr.la_valid = LA_ATIME;
rc = mo_attr_set(info->mti_env, next, ma);
}
ma->ma_need |= MA_INODE;
ma->ma_valid = 0;
if (!MFD_CLOSED(mode))
rc = mo_close(info->mti_env, next, ma);
else if (ret == -EAGAIN)
rc = mo_attr_get(info->mti_env, next, ma);
/* If the object is unlinked, do not try to re-enable SIZEONMDS */
if ((ret == -EAGAIN) && (ma->ma_valid & MA_INODE) &&
(ma->ma_attr.la_nlink == 0)) {
ret = 0;
}
if ((ret == -EAGAIN) || (ret == 1)) {
struct mdt_export_data *med;
/* The epoch has not closed or Size-on-MDS update is needed.
* Put mfd back into the list. */ LASSERT(mdt_conn_flags(info) & OBD_CONNECT_SOM);
mdt_mfd_set_mode(mfd, (ret == 1 ? FMODE_EPOCH : FMODE_SOM));
LASSERT(mdt_info_req(info));
med = &mdt_info_req(info)->rq_export->exp_mdt_data;
spin_lock(&med->med_open_lock);
list_add(&mfd->mfd_list, &med->med_open_head);
class_handle_hash_back(&mfd->mfd_handle);
spin_unlock(&med->med_open_lock);
if (ret == 1) {
ret = 0;
} else {
CDEBUG(D_INODE, "Size-on-MDS attribute update is "
"needed on "DFID"\n", PFID(mdt_object_fid(o)));
}
} else {
mdt_mfd_free(mfd);
mdt_object_put(info->mti_env, o);
}
RETURN(rc ? rc : ret);
}
int mdt_close(struct mdt_thread_info *info)
{
struct mdt_export_data *med;
struct mdt_file_data *mfd;
struct mdt_object *o;
struct md_attr *ma = &info->mti_attr;
struct mdt_body *repbody = NULL;
struct ptlrpc_request *req = mdt_info_req(info);
int rc, ret = 0;
ENTRY;
/* Close may come with the Size-on-MDS update. Unpack it. */
rc = mdt_close_unpack(info);
if (rc)
RETURN(err_serious(rc));
LASSERT(info->mti_epoch);
req_capsule_set_size(&info->mti_pill, &RMF_MDT_MD, RCL_SERVER,
info->mti_mdt->mdt_max_mdsize);
req_capsule_set_size(&info->mti_pill, &RMF_LOGCOOKIES, RCL_SERVER,
info->mti_mdt->mdt_max_cookiesize);
rc = req_capsule_pack(&info->mti_pill);
if (mdt_check_resent(info, mdt_reconstruct_generic, NULL))
RETURN(lustre_msg_get_status(req->rq_repmsg));
/* Continue to close handle even if we can not pack reply */
if (rc == 0) {
repbody = req_capsule_server_get(&info->mti_pill,
&RMF_MDT_BODY);
ma->ma_lmm = req_capsule_server_get(&info->mti_pill,
&RMF_MDT_MD);
ma->ma_lmm_size = req_capsule_get_size(&info->mti_pill,
&RMF_MDT_MD,
RCL_SERVER);
ma->ma_cookie = req_capsule_server_get(&info->mti_pill,
&RMF_LOGCOOKIES);
ma->ma_cookie_size = req_capsule_get_size(&info->mti_pill,
&RMF_LOGCOOKIES,
RCL_SERVER);
ma->ma_need = MA_INODE | MA_LOV | MA_COOKIE;
repbody->eadatasize = 0;
repbody->aclsize = 0;
} else
rc = err_serious(rc);
med = &req->rq_export->exp_mdt_data;
spin_lock(&med->med_open_lock);
mfd = mdt_handle2mfd(info, &info->mti_epoch->handle);
if (mdt_mfd_closed(mfd)) {
spin_unlock(&med->med_open_lock);
CDEBUG(D_INODE, "no handle for file close: fid = "DFID
": cookie = "LPX64"\n", PFID(info->mti_rr.rr_fid1),
info->mti_epoch->handle.cookie);
rc = err_serious(-ESTALE);
} else {
class_handle_unhash(&mfd->mfd_handle);
list_del_init(&mfd->mfd_list);
spin_unlock(&med->med_open_lock);
/* Do not lose object before last unlink. */
o = mfd->mfd_object;
mdt_object_get(info->mti_env, o);
ret = mdt_mfd_close(info, mfd);
if (repbody != NULL)
rc = mdt_handle_last_unlink(info, o, ma);
mdt_empty_transno(info);
mdt_object_put(info->mti_env, o);
}
if (repbody != NULL)
mdt_shrink_reply(info);
if (MDT_FAIL_CHECK(OBD_FAIL_MDS_CLOSE_PACK))
RETURN(err_serious(-ENOMEM));
RETURN(rc ? rc : ret);
}
int mdt_done_writing(struct mdt_thread_info *info)
{
struct mdt_body *repbody = NULL;
struct mdt_export_data *med;
struct mdt_file_data *mfd;
int rc;
ENTRY;
rc = req_capsule_pack(&info->mti_pill);
if (rc)
RETURN(err_serious(rc));
repbody = req_capsule_server_get(&info->mti_pill,
&RMF_MDT_BODY);
repbody->eadatasize = 0;
repbody->aclsize = 0;
/* Done Writing may come with the Size-on-MDS update. Unpack it. */
rc = mdt_close_unpack(info);
if (rc)
RETURN(err_serious(rc));
if (mdt_check_resent(info, mdt_reconstruct_generic, NULL))
RETURN(lustre_msg_get_status(mdt_info_req(info)->rq_repmsg));
med = &info->mti_exp->exp_mdt_data;
spin_lock(&med->med_open_lock);
mfd = mdt_handle2mfd(info, &info->mti_epoch->handle);
if (mfd == NULL) {
spin_unlock(&med->med_open_lock);
CDEBUG(D_INODE, "no handle for done write: fid = "DFID
": cookie = "LPX64"\n", PFID(info->mti_rr.rr_fid1),
info->mti_epoch->handle.cookie);
RETURN(-ESTALE);
}
LASSERT(mfd->mfd_mode == FMODE_EPOCH ||
mfd->mfd_mode == FMODE_EPOCHLCK); class_handle_unhash(&mfd->mfd_handle);
list_del_init(&mfd->mfd_list);
spin_unlock(&med->med_open_lock);
/* Set EPOCH CLOSE flag if not set by client. */
info->mti_epoch->flags |= MF_EPOCH_CLOSE;
info->mti_attr.ma_valid = 0;
rc = mdt_mfd_close(info, mfd);
mdt_empty_transno(info);
RETURN(rc);
}