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oplock.c
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/*
* fs/cifsd/oplock.c
*
* Copyright (C) 2015 Samsung Electronics Co., Ltd.
* Copyright (C) 2016 Namjae Jeon <namjae.jeon@protocolfreedom.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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 for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "glob.h"
#include "export.h"
#include "smb1pdu.h"
#ifdef CONFIG_CIFS_SMB2_SERVER
#include "smb2pdu.h"
#endif
#include "oplock.h"
bool oplocks_enable = true;
#ifdef CONFIG_CIFS_SMB2_SERVER
bool lease_enable = true;
bool durable_enable = true;
#endif
LIST_HEAD(ofile_list);
DEFINE_MUTEX(ofile_list_lock);
module_param(oplocks_enable, bool, 0644);
MODULE_PARM_DESC(oplocks_enable, "Enable or disable oplocks. Default: y/Y/1");
#ifdef CONFIG_CIFS_SMB2_SERVER
module_param(lease_enable, bool, 0644);
MODULE_PARM_DESC(lease_enable, "Enable or disable lease. Default: y/Y/1");
module_param(durable_enable, bool, 0644);
MODULE_PARM_DESC(durable_enable, "Enable or disable lease. Default: y/Y/1");
#endif
void release_ofile(struct cifsd_file *fp)
{
struct cifsd_file *tmp_fp;
struct ofile_info *ofile;
struct list_head *cur;
ofile = fp->ofile;
list_del(&fp->ofile->i_list);
fp->ofile = NULL;
list_for_each(cur, &fp->f_mfp->m_fp_list) {
tmp_fp = list_entry(cur, struct cifsd_file, node);
if (ofile == tmp_fp->ofile)
tmp_fp->ofile = NULL;
}
kfree(ofile);
}
/**
* dispose_ofile_list() - free all memory allocated for ofile
*
* unlikely that ofile_list will have any remaining entry at rmmod,
* still check and dispose if any entry present at rmmod time.
*/
void dispose_ofile_list(void)
{
struct ofile_info *ofile, *tmp1;
struct oplock_info *opinfo, *tmp2;
mutex_lock(&ofile_list_lock);
list_for_each_entry_safe(ofile, tmp1, &ofile_list, i_list) {
if (atomic_read(&ofile->op_count) > 0) {
list_for_each_entry_safe(opinfo, tmp2,
&ofile->op_write_list, op_list) {
list_del(&opinfo->op_list);
kfree(opinfo);
atomic_dec(&ofile->op_count);
}
list_for_each_entry_safe(opinfo, tmp2,
&ofile->op_read_list, op_list) {
list_del(&opinfo->op_list);
kfree(opinfo);
atomic_dec(&ofile->op_count);
}
list_for_each_entry_safe(opinfo, tmp2,
&ofile->op_none_list, op_list) {
list_del(&opinfo->op_list);
kfree(opinfo);
atomic_dec(&ofile->op_count);
}
}
if (!atomic_read(&ofile->op_count)) {
list_del(&ofile->i_list);
kfree(ofile);
}
}
mutex_unlock(&ofile_list_lock);
}
/**
* get_new_ofile() - allocate a new ofile object for open file
* @inode: inode of opened file
*
* Return: allocated ofile object on success, otherwise NULL
*/
struct ofile_info *get_new_ofile(struct inode *inode)
{
struct ofile_info *ofile_new;
ofile_new = kmalloc(sizeof(struct ofile_info), GFP_NOFS);
if (!ofile_new)
return NULL;
ofile_new->inode = inode;
INIT_LIST_HEAD(&ofile_new->i_list);
INIT_LIST_HEAD(&ofile_new->op_write_list);
INIT_LIST_HEAD(&ofile_new->op_read_list);
INIT_LIST_HEAD(&ofile_new->op_none_list);
atomic_set(&ofile_new->op_count, 0);
ofile_new->stream_name = NULL;
init_waitqueue_head(&ofile_new->op_end_wq);
return ofile_new;
}
/**
* get_new_opinfo() - allocate a new opinfo object for oplock info
* @conn: TCP server instance of connection
* @id: fid of open file
* @Tid: tree id of connection
* @lctx: lease context information
*
* Return: allocated opinfo object on success, otherwise NULL
*/
static struct oplock_info *get_new_opinfo(struct smb_work *work,
int id, __u16 Tid, struct lease_ctx_info *lctx)
{
struct cifsd_sess *sess = work->sess;
struct oplock_info *opinfo;
#ifdef CONFIG_CIFS_SMB2_SERVER
struct lease_fidinfo *fidinfo;
#endif
opinfo = kzalloc(sizeof(struct oplock_info), GFP_NOFS);
if (!opinfo)
return NULL;
opinfo->work = work;
opinfo->sess = sess;
opinfo->conn = sess->conn;
opinfo->lock_type = OPLOCK_NONE;
opinfo->state = OPLOCK_NOT_BREAKING;
opinfo->fid = id;
opinfo->Tid = Tid;
INIT_LIST_HEAD(&opinfo->op_list);
INIT_LIST_HEAD(&opinfo->fid_list);
#ifdef CONFIG_CIFS_SMB2_SERVER
if (lctx) {
memcpy(opinfo->LeaseKey, lctx->LeaseKey, SMB2_LEASE_KEY_SIZE);
opinfo->CurrentLeaseState = lctx->CurrentLeaseState;
opinfo->NewLeaseState = 0;
opinfo->LeaseFlags = lctx->LeaseFlags;
opinfo->LeaseDuration = lctx->LeaseDuration;
fidinfo = kmalloc(sizeof(struct lease_fidinfo), GFP_NOFS);
if (!fidinfo) {
kfree(opinfo);
return NULL;
}
INIT_LIST_HEAD(&fidinfo->fid_entry);
fidinfo->fid = id;
list_add(&fidinfo->fid_entry, &opinfo->fid_list);
atomic_set(&opinfo->LeaseCount, 1);
opinfo->leased = 1;
}
#endif
return opinfo;
}
/**
* get_write_oplock() - check if write oplock is granted on file
* @ofile: opened file to be checked for oplock status
*
* Return: opinfo if write oplock is granted, otherwise NULL
*/
static struct oplock_info *get_write_oplock(struct ofile_info *ofile)
{
if (list_empty(&ofile->op_write_list))
return NULL;
return list_first_entry(&ofile->op_write_list,
struct oplock_info, op_list);
}
/**
* get_read_oplock() - check if read oplock is granted on file
* @ofile: opened file to be checked for oplock status
*
* Return: opinfo if read oplock is granted, otherwise NULL
*/
static struct oplock_info *get_read_oplock(struct ofile_info *ofile)
{
if (list_empty(&ofile->op_read_list))
return NULL;
return list_first_entry(&ofile->op_read_list,
struct oplock_info, op_list);
}
/**
* get_matching_opinfo() - find a matching oplock info object
* @conn: TCP server instance of connection
* @ofile: opened file to be checked for oplock status
* @fid: fid of open file
* @fhclose: is it called from file close context
*
* Return: opinfo if found matching opinfo, otherwise NULL
*/
struct oplock_info *get_matching_opinfo(struct connection *conn,
struct ofile_info *ofile, int fid, int fhclose)
{
struct oplock_info *opinfo;
if (!ofile)
return NULL;
list_for_each_entry(opinfo, &ofile->op_write_list, op_list) {
if (!opinfo->leased && (conn == opinfo->conn) &&
(opinfo->fid == fid))
return opinfo;
}
list_for_each_entry(opinfo, &ofile->op_read_list, op_list) {
if (!opinfo->leased && (conn == opinfo->conn) &&
(opinfo->fid == fid))
return opinfo;
}
/* none list should be traversed only from file close path */
if (!fhclose)
return NULL;
list_for_each_entry(opinfo, &ofile->op_none_list, op_list) {
if (!opinfo->leased && (conn == opinfo->conn) &&
(opinfo->fid == fid))
return opinfo;
}
return NULL;
}
/**
* opinfo_write_to_read() - convert a write oplock to read oplock
* @ofile: opened file to be checked for oplock status
* @opinfo: current oplock info
* @lease_state: current lease state
*
* Return: 0 on success, otherwise -EINVAL
*/
int opinfo_write_to_read(struct ofile_info *ofile,
struct oplock_info *opinfo, __le32 lease_state)
{
if (!ofile || !opinfo)
return -EINVAL;
if (IS_SMB2(opinfo->conn)) {
#ifdef CONFIG_CIFS_SMB2_SERVER
if (!((opinfo->lock_type == SMB2_OPLOCK_LEVEL_BATCH) ||
(opinfo->lock_type == SMB2_OPLOCK_LEVEL_EXCLUSIVE))) {
cifsd_err("bad oplock(0x%x)\n", opinfo->lock_type);
if (opinfo->leased)
cifsd_err("lease state(0x%x)\n",
opinfo->CurrentLeaseState);
return -EINVAL;
}
opinfo->lock_type = SMB2_OPLOCK_LEVEL_II;
if (opinfo->leased) {
opinfo->NewLeaseState = SMB2_LEASE_NONE;
opinfo->CurrentLeaseState = SMB2_LEASE_READ_CACHING;
if (lease_state & SMB2_LEASE_HANDLE_CACHING)
opinfo->CurrentLeaseState |=
SMB2_LEASE_HANDLE_CACHING;
}
#endif
} else {
if (!((opinfo->lock_type == OPLOCK_EXCLUSIVE) ||
(opinfo->lock_type == OPLOCK_BATCH))) {
cifsd_err("bad oplock(0x%x)\n", opinfo->lock_type);
return -EINVAL;
}
opinfo->lock_type = OPLOCK_READ;
}
list_move(&opinfo->op_list, &ofile->op_read_list);
return 0;
}
/**
* opinfo_write_to_none() - convert a write oplock to none
* @ofile: opened file to be checked for oplock status
* @opinfo: current oplock info
*
* Return: 0 on success, otherwise -EINVAL
*/
int opinfo_write_to_none(struct ofile_info *ofile,
struct oplock_info *opinfo)
{
if (!ofile || !opinfo)
return -EINVAL;
if (IS_SMB2(opinfo->conn)) {
#ifdef CONFIG_CIFS_SMB2_SERVER
if (!((opinfo->lock_type == SMB2_OPLOCK_LEVEL_BATCH) ||
(opinfo->lock_type == SMB2_OPLOCK_LEVEL_EXCLUSIVE))) {
cifsd_err("bad oplock(0x%x)\n", opinfo->lock_type);
if (opinfo->leased)
cifsd_err("lease state(0x%x)\n",
opinfo->CurrentLeaseState);
return -EINVAL;
}
opinfo->lock_type = SMB2_OPLOCK_LEVEL_NONE;
if (opinfo->leased) {
opinfo->NewLeaseState = SMB2_LEASE_NONE;
opinfo->CurrentLeaseState = SMB2_LEASE_NONE;
}
#endif
} else {
if (!((opinfo->lock_type == OPLOCK_EXCLUSIVE) ||
(opinfo->lock_type == OPLOCK_BATCH))) {
cifsd_err("bad oplock(0x%x)\n", opinfo->lock_type);
return -EINVAL;
}
opinfo->lock_type = OPLOCK_NONE;
}
list_move(&opinfo->op_list, &ofile->op_none_list);
return 0;
}
/**
* opinfo_read_to_none() - convert a write read to none
* @ofile: opened file to be checked for oplock status
* @opinfo: current oplock info
*
* Return: 0 on success, otherwise -EINVAL
*/
int opinfo_read_to_none(struct ofile_info *ofile,
struct oplock_info *opinfo)
{
if (!ofile || !opinfo)
return -EINVAL;
if (IS_SMB2(opinfo->conn)) {
#ifdef CONFIG_CIFS_SMB2_SERVER
if (opinfo->lock_type != SMB2_OPLOCK_LEVEL_II) {
cifsd_err("bad oplock(0x%x)\n", opinfo->lock_type);
if (opinfo->leased)
cifsd_err("lease state(0x%x)\n",
opinfo->CurrentLeaseState);
return -EINVAL;
}
opinfo->lock_type = SMB2_OPLOCK_LEVEL_NONE;
if (opinfo->leased) {
opinfo->NewLeaseState = SMB2_LEASE_NONE;
opinfo->CurrentLeaseState = SMB2_LEASE_NONE;
}
#endif
} else {
if (opinfo->lock_type != OPLOCK_READ) {
cifsd_err("bad oplock(0x%x)\n", opinfo->lock_type);
return -EINVAL;
}
opinfo->lock_type = OPLOCK_NONE;
}
list_move(&opinfo->op_list, &ofile->op_none_list);
return 0;
}
#ifdef CONFIG_CIFS_SMB2_SERVER
/**
* lease_read_to_write() - upgrade lease state from read to write
* @ofile: opened file to be checked for oplock status
* @opinfo: current lease info
*
* Return: 0 on success, otherwise -EINVAL
*/
int lease_read_to_write(struct ofile_info *ofile, struct oplock_info *opinfo)
{
if (!(opinfo->CurrentLeaseState & SMB2_LEASE_READ_CACHING)) {
cifsd_debug("bad lease state(0x%x)\n",
opinfo->CurrentLeaseState);
return -EINVAL;
}
opinfo->NewLeaseState = SMB2_LEASE_NONE;
opinfo->CurrentLeaseState |= SMB2_LEASE_WRITE_CACHING;
if (opinfo->CurrentLeaseState & SMB2_LEASE_HANDLE_CACHING)
opinfo->lock_type = SMB2_OPLOCK_LEVEL_BATCH;
else
opinfo->lock_type = SMB2_OPLOCK_LEVEL_EXCLUSIVE;
list_move(&opinfo->op_list, &ofile->op_write_list);
return 0;
}
/**
* lease_none_upgrade() - upgrade lease state from none
* @ofile: opened file to be checked for oplock status
* @opinfo: current lease info
* @curr_state: current lease state
*
* Return: 0 on success, otherwise -EINVAL
*/
int lease_none_upgrade(struct ofile_info *ofile, struct oplock_info *opinfo,
__le32 curr_state)
{
if (!(opinfo->CurrentLeaseState == SMB2_LEASE_NONE)) {
cifsd_debug("bad lease state(0x%x)\n",
opinfo->CurrentLeaseState);
return -EINVAL;
}
opinfo->NewLeaseState = SMB2_LEASE_NONE;
opinfo->CurrentLeaseState = curr_state;
if (opinfo->CurrentLeaseState & SMB2_LEASE_HANDLE_CACHING) {
if (opinfo->CurrentLeaseState & SMB2_LEASE_WRITE_CACHING) {
opinfo->lock_type = SMB2_OPLOCK_LEVEL_BATCH;
list_move(&opinfo->op_list, &ofile->op_write_list);
} else {
opinfo->lock_type = SMB2_OPLOCK_LEVEL_II;
list_move(&opinfo->op_list, &ofile->op_read_list);
}
} else if (opinfo->CurrentLeaseState & SMB2_LEASE_WRITE_CACHING) {
opinfo->lock_type = SMB2_OPLOCK_LEVEL_EXCLUSIVE;
list_move(&opinfo->op_list, &ofile->op_write_list);
} else if (opinfo->CurrentLeaseState & SMB2_LEASE_READ_CACHING) {
opinfo->lock_type = SMB2_OPLOCK_LEVEL_II;
list_move(&opinfo->op_list, &ofile->op_read_list);
}
return 0;
}
/**
* close_id_del_lease() - release lease object at file close time
* @conn: TCP server instance of connection
* @fp: cifsd file pointer
* @id: fid of open file
*/
static void close_id_del_lease(struct connection *conn,
struct cifsd_file *fp, unsigned int id)
{
struct ofile_info *ofile = NULL;
struct oplock_info *opinfo = NULL;
struct lease_fidinfo *fidinfo = NULL;
ofile = fp->ofile;
opinfo = get_matching_opinfo_lease(conn, &ofile, fp->LeaseKey,
&fidinfo, id);
if (!opinfo || !fidinfo)
goto out;
if (atomic_read(&opinfo->LeaseCount) > 1) {
list_del(&fidinfo->fid_entry);
kfree(fidinfo);
atomic_dec(&opinfo->LeaseCount);
} else if (atomic_read(&opinfo->LeaseCount) == 1) {
if ((opinfo->state == OPLOCK_BREAKING) &&
(opinfo->lock_type == SMB2_OPLOCK_LEVEL_EXCLUSIVE ||
opinfo->lock_type == SMB2_OPLOCK_LEVEL_BATCH)) {
opinfo->lock_type = SMB2_OPLOCK_LEVEL_II;
wake_up_interruptible(&conn->oplock_q);
list_del(&opinfo->op_list);
atomic_dec(&ofile->op_count);
mutex_unlock(&ofile_list_lock);
wait_event_timeout(ofile->op_end_wq,
opinfo->state == OPLOCK_NOT_BREAKING,
OPLOCK_WAIT_TIME);
mutex_lock(&ofile_list_lock);
} else {
list_del(&opinfo->op_list);
atomic_dec(&ofile->op_count);
}
list_del(&fidinfo->fid_entry);
kfree(fidinfo);
atomic_dec(&opinfo->LeaseCount);
kfree(opinfo);
} else {
cifsd_err("bad lease cnt %d\n",
atomic_read(&opinfo->LeaseCount));
}
out:
if (!atomic_read(&ofile->op_count))
release_ofile(fp);
}
#endif
/**
* close_id_del_oplock() - release oplock object at file close time
* @conn: TCP server instance of connection
* @fp: cifsd file pointer
* @id: fid of open file
*/
void close_id_del_oplock(struct connection *conn,
struct cifsd_file *fp, unsigned int id)
{
struct ofile_info *ofile;
struct oplock_info *opinfo;
if (!oplocks_enable || S_ISDIR(file_inode(fp->filp)->i_mode))
return;
mutex_lock(&ofile_list_lock);
ofile = fp->ofile;
if (!ofile || atomic_read(&ofile->op_count) <= 0) {
mutex_unlock(&ofile_list_lock);
return;
}
#ifdef CONFIG_CIFS_SMB2_SERVER
if (fp->lease_granted) {
close_id_del_lease(conn, fp, id);
mutex_unlock(&ofile_list_lock);
return;
}
#endif
opinfo = get_matching_opinfo(conn, ofile, id, 1);
if (!opinfo)
goto out;
if ((opinfo->state == OPLOCK_BREAKING) &&
(opinfo->lock_type == OPLOCK_EXCLUSIVE ||
opinfo->lock_type == OPLOCK_BATCH ||
opinfo->lock_type == SMB2_OPLOCK_LEVEL_EXCLUSIVE ||
opinfo->lock_type == SMB2_OPLOCK_LEVEL_BATCH)) {
if (IS_SMB2(opinfo->conn)) {
#ifdef CONFIG_CIFS_SMB2_SERVER
opinfo->lock_type = SMB2_OPLOCK_LEVEL_II;
#endif
} else
opinfo->lock_type = OPLOCK_READ;
wake_up_interruptible(&conn->oplock_q);
list_del(&opinfo->op_list);
atomic_dec(&ofile->op_count);
mutex_unlock(&ofile_list_lock);
wait_event_timeout(ofile->op_end_wq,
opinfo->state == OPLOCK_NOT_BREAKING,
OPLOCK_WAIT_TIME);
mutex_lock(&ofile_list_lock);
} else {
list_del(&opinfo->op_list);
atomic_dec(&ofile->op_count);
}
kfree(opinfo);
out:
if (!atomic_read(&ofile->op_count))
release_ofile(fp);
mutex_unlock(&ofile_list_lock);
}
#ifdef CONFIG_CIFS_SMB2_SERVER
/**
* smb_send_lease_break() - send lease break command from server to client
* @work: smb work object
*/
static void smb_send_lease_break(struct work_struct *work)
{
struct smb2_lease_break *rsp = NULL;
struct smb_work *smb_work = container_of(work, struct smb_work, work);
struct oplock_info *opinfo = (struct oplock_info *)smb_work->buf;
struct connection *conn = opinfo->conn;
struct smb2_hdr *rsp_hdr;
atomic_inc(&conn->req_running);
mutex_lock(&conn->srv_mutex);
if (conn->ops->allocate_rsp_buf(smb_work)) {
cifsd_debug("smb2_allocate_rsp_buf failed! ");
mutex_unlock(&conn->srv_mutex);
kfree(smb_work);
return;
}
rsp_hdr = (struct smb2_hdr *)smb_work->rsp_buf;
memset(rsp_hdr, 0, sizeof(struct smb2_hdr) + 2);
rsp_hdr->smb2_buf_length = cpu_to_be32(sizeof(struct smb2_hdr) - 4);
rsp_hdr->ProtocolId[0] = 0XFE;
rsp_hdr->ProtocolId[1] = 'S';
rsp_hdr->ProtocolId[2] = 'M';
rsp_hdr->ProtocolId[3] = 'B';
rsp_hdr->StructureSize = SMB2_HEADER_STRUCTURE_SIZE;
rsp_hdr->CreditRequest = cpu_to_le16(0);
rsp_hdr->Command = cpu_to_le16(0x12);
rsp_hdr->Flags = (SMB2_FLAGS_SERVER_TO_REDIR);
rsp_hdr->NextCommand = 0;
rsp_hdr->MessageId = cpu_to_le64(-1);
rsp_hdr->Id.SyncId.ProcessId = 0;
rsp_hdr->Id.SyncId.TreeId = 0;
rsp_hdr->SessionId = 0;
memset(rsp_hdr->Signature, 0, 16);
rsp = (struct smb2_lease_break *)smb_work->rsp_buf;
rsp->StructureSize = cpu_to_le16(44);
rsp->Reserved = 0;
rsp->Flags = 0;
if (opinfo->CurrentLeaseState & (SMB2_LEASE_WRITE_CACHING |
SMB2_LEASE_HANDLE_CACHING))
rsp->Flags = SMB2_NOTIFY_BREAK_LEASE_FLAG_ACK_REQUIRED;
memcpy(rsp->LeaseKey, opinfo->LeaseKey, SMB2_LEASE_KEY_SIZE);
rsp->CurrentLeaseState = opinfo->CurrentLeaseState;
rsp->NewLeaseState = opinfo->NewLeaseState;
rsp->BreakReason = 0;
rsp->AccessMaskHint = 0;
rsp->ShareMaskHint = 0;
inc_rfc1001_len(rsp, 44);
smb_send_rsp(smb_work);
mempool_free(smb_work->rsp_buf, cifsd_sm_rsp_poolp);
kfree(smb_work);
mutex_unlock(&conn->srv_mutex);
atomic_dec(&conn->req_running);
if (waitqueue_active(&conn->req_running_q))
wake_up_all(&conn->req_running_q);
}
#endif
/**
* smb_breakII_oplock() - send level2 oplock or read lease break command from
* server to client
* @conn: TCP server instance of connection
* @fp: cifsd file pointer
* @openfile: open file information
*/
void smb_breakII_oplock(struct connection *conn,
struct cifsd_file *fp, struct ofile_info *openfile)
{
struct ofile_info *ofile;
struct oplock_info *opinfo, *optmp;
struct list_head *tmp;
struct smb_work *work;
bool ack_required = 0;
struct inode *inode = file_inode(fp->filp);
if (!(fp && fp->ofile) && !openfile) {
if (fp) {
inode = file_inode(fp->filp);
list_for_each(tmp, &ofile_list) {
openfile = list_entry(tmp,
struct ofile_info, i_list);
if (openfile->inode == inode)
break;
}
if (!openfile)
return;
} else
return;
}
if (openfile)
ofile = openfile;
else
ofile = fp->ofile;
list_for_each_entry_safe(opinfo, optmp,
&ofile->op_read_list, op_list) {
if (IS_SMB2(opinfo->conn)) {
#ifdef CONFIG_CIFS_SMB2_SERVER
if (opinfo->leased && (opinfo->CurrentLeaseState &
(~(SMB2_LEASE_READ_CACHING |
SMB2_LEASE_HANDLE_CACHING)))) {
cifsd_err("unexpected lease state(0x%x)\n",
opinfo->CurrentLeaseState);
continue;
} else if (opinfo->lock_type !=
SMB2_OPLOCK_LEVEL_II) {
cifsd_err("unexpected oplock(0x%x)\n",
opinfo->lock_type);
continue;
}
#endif
} else {
if (opinfo->lock_type != OPLOCK_READ) {
cifsd_err("unexpected oplock(0x%x)\n",
opinfo->lock_type);
continue;
}
}
#ifdef CONFIG_CIFS_SMB2_SERVER
if ((fp && fp->lease_granted) && opinfo->leased &&
!memcmp(conn->ClientGUID,
opinfo->conn->ClientGUID,
SMB2_CLIENT_GUID_SIZE) &&
!memcmp(fp->LeaseKey,
opinfo->LeaseKey,
SMB2_LEASE_KEY_SIZE)) {
continue;
}
#endif
work = kmem_cache_zalloc(cifsd_work_cache, GFP_NOFS);
if (!work) {
cifsd_err("cannot allocate memory\n");
continue;
}
work->conn = opinfo->conn;
work->sess = opinfo->sess;
work->buf = (char *)opinfo;
ack_required = 0;
if (IS_SMB2(opinfo->conn)) {
#ifdef CONFIG_CIFS_SMB2_SERVER
if (opinfo->leased) {
/* send lease break */
if (opinfo->CurrentLeaseState &
(SMB2_LEASE_HANDLE_CACHING |
SMB2_LEASE_WRITE_CACHING)) {
opinfo->state = OPLOCK_BREAKING;
ack_required = 1;
}
opinfo->NewLeaseState = SMB2_LEASE_NONE;
smb_send_lease_break(&work->work);
if (!ack_required)
opinfo->CurrentLeaseState =
SMB2_LEASE_NONE;
} else {
/* send oplock break */
smb2_send_oplock_break(&work->work);
}
#endif
} else {
ack_required = 1;
opinfo->state = OPLOCK_BREAKING;
smb1_send_oplock_break(&work->work);
}
if (!ack_required)
list_move(&opinfo->op_list, &ofile->op_none_list);
}
}
/**
* smb1_oplock_break_to_levelII() - send smb1 exclusive/batch to level2 oplock
* break command from server to client
* @ofile: open file object
* @opinfo: oplock info object
*
* Return: 0 on success, otherwise error
*/
static int smb1_oplock_break_to_levelII(struct ofile_info *ofile,
struct oplock_info *opinfo)
{
struct connection *conn = opinfo->conn;
int ret = 0;
struct smb_work *work = kmem_cache_zalloc(cifsd_work_cache, GFP_NOFS);
if (!work)
return -ENOMEM;
work->buf = (char *)opinfo;
work->conn = conn;
INIT_WORK(&work->work, smb1_send_oplock_break);
schedule_work(&work->work);
/*
* TODO: change to wait_event_interruptible_timeout once oplock break
* notification timeout is decided. In case of oplock break from
* levelII to none, we don't need to wait for client response.
*/
wait_event_interruptible_timeout(conn->oplock_q,
opinfo->lock_type == OPLOCK_READ ||
opinfo->lock_type == OPLOCK_NONE,
OPLOCK_WAIT_TIME);
/* is this a timeout ? */
if (opinfo->lock_type == OPLOCK_EXCLUSIVE ||
opinfo->lock_type == OPLOCK_BATCH) {
mutex_lock(&ofile_list_lock);
ret = opinfo_write_to_read(ofile, opinfo, 0);
mutex_unlock(&ofile_list_lock);
}
return ret;
}
#ifdef CONFIG_CIFS_SMB2_SERVER
/**
* smb2_oplock_break_to_levelII() - send smb2 exclusive/batch to level2 oplock
* break command from server to client
* @ofile: open file object
* @opinfo: oplock info object
*
* Return: 0 on success, otherwise error
*/
static int smb2_oplock_break_to_levelII(struct ofile_info *ofile,
struct oplock_info *opinfo)
{
struct connection *conn = opinfo->conn;
int ret = 0;
struct smb_work *work = kmem_cache_zalloc(cifsd_work_cache, GFP_NOFS);
if (!work)
return -ENOMEM;
work->buf = (char *)opinfo;
work->conn = conn;
work->sess = opinfo->sess;
INIT_WORK(&work->work, smb2_send_oplock_break);
schedule_work(&work->work);
wait_event_interruptible_timeout(conn->oplock_q,
opinfo->lock_type == SMB2_OPLOCK_LEVEL_II ||
opinfo->lock_type == SMB2_OPLOCK_LEVEL_NONE,
OPLOCK_WAIT_TIME);
/* is this a timeout ? */
if (opinfo->lock_type == SMB2_OPLOCK_LEVEL_EXCLUSIVE ||
opinfo->lock_type == SMB2_OPLOCK_LEVEL_BATCH) {
mutex_lock(&ofile_list_lock);
ret = opinfo_write_to_read(ofile, opinfo, 0);
mutex_unlock(&ofile_list_lock);
}
return ret;
}
#endif
/**
* grant_write_oplock() - grant exclusive/batch oplock or write lease
* @ofile: open file object
* @opinfo_new: new oplock info object
* @oplock: granted oplock type
* @fp: cifsd file pointer
* @lctx: lease context information
*
* Return: 0
*/
static int grant_write_oplock(struct ofile_info *ofile,
struct oplock_info *opinfo_new, int *oplock,
struct cifsd_file *fp, struct lease_ctx_info *lctx)
{
WARN_ON(!list_empty(&ofile->op_write_list));
if (IS_SMB2(opinfo_new->conn)) {
#ifdef CONFIG_CIFS_SMB2_SERVER
if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
*oplock = SMB2_OPLOCK_LEVEL_BATCH;
opinfo_new->lock_type = SMB2_OPLOCK_LEVEL_BATCH;
} else {
*oplock = SMB2_OPLOCK_LEVEL_EXCLUSIVE;
opinfo_new->lock_type = SMB2_OPLOCK_LEVEL_EXCLUSIVE;
}
#endif
} else {
if (*oplock == REQ_BATCHOPLOCK) {
*oplock = OPLOCK_BATCH;
opinfo_new->lock_type = OPLOCK_BATCH;
} else {
*oplock = OPLOCK_EXCLUSIVE;
opinfo_new->lock_type = OPLOCK_EXCLUSIVE;
}
}
#ifdef CONFIG_CIFS_SMB2_SERVER
if (lctx) {
lctx->CurrentLeaseState = opinfo_new->CurrentLeaseState;
memcpy(fp->LeaseKey, lctx->LeaseKey,
SMB2_LEASE_KEY_SIZE);
fp->lease_granted = 1;
}
#endif
list_add(&opinfo_new->op_list, &ofile->op_write_list);
atomic_inc(&ofile->op_count);
fp->ofile = ofile;
return 0;
}
/**
* grant_read_oplock() - grant level2 oplock or read lease
* @ofile: open file object
* @opinfo_new: new oplock info object
* @oplock: granted oplock type
* @fp: cifsd file pointer
* @lctx: lease context information
*
* Return: 0
*/
static int grant_read_oplock(struct ofile_info *ofile,
struct oplock_info *opinfo_new, int *oplock,
struct cifsd_file *fp, struct lease_ctx_info *lctx)
{
if (IS_SMB2(opinfo_new->conn)) {
#ifdef CONFIG_CIFS_SMB2_SERVER
*oplock = SMB2_OPLOCK_LEVEL_II;
opinfo_new->lock_type = SMB2_OPLOCK_LEVEL_II;
#endif
} else {
*oplock = OPLOCK_READ;
opinfo_new->lock_type = OPLOCK_READ;
}
#ifdef CONFIG_CIFS_SMB2_SERVER
if (lctx) {
opinfo_new->CurrentLeaseState = SMB2_LEASE_READ_CACHING;
if (lctx->CurrentLeaseState & SMB2_LEASE_HANDLE_CACHING)
opinfo_new->CurrentLeaseState |=
SMB2_LEASE_HANDLE_CACHING;
lctx->CurrentLeaseState = opinfo_new->CurrentLeaseState;
memcpy(fp->LeaseKey, lctx->LeaseKey,
SMB2_LEASE_KEY_SIZE);
fp->lease_granted = 1;
}
#endif
list_add(&opinfo_new->op_list, &ofile->op_read_list);
atomic_inc(&ofile->op_count);
/*
* adding opinfo in fp will help in identifying opinfo without
* the need of traversing global oplock list in case of
* file close response and oplock break response
*/
fp->ofile = ofile;
return 0;
}
/**
* grant_none_oplock() - grant none oplock or none lease
* @ofile: open file object
* @opinfo_new: new oplock info object
* @oplock: granted oplock type
* @fp: cifsd file pointer
* @lctx: lease context information
*
* Return: 0
*/
static int grant_none_oplock(struct ofile_info *ofile,
struct oplock_info *opinfo_new, int *oplock,
struct cifsd_file *fp, struct lease_ctx_info *lctx)
{
if (IS_SMB2(opinfo_new->conn)) {
#ifdef CONFIG_CIFS_SMB2_SERVER
*oplock = SMB2_OPLOCK_LEVEL_NONE;
opinfo_new->lock_type = SMB2_OPLOCK_LEVEL_NONE;
#endif
} else {
*oplock = OPLOCK_NONE;
opinfo_new->lock_type = OPLOCK_NONE;
}
#ifdef CONFIG_CIFS_SMB2_SERVER
if (lctx) {
opinfo_new->CurrentLeaseState = 0;
lctx->CurrentLeaseState = 0;
memcpy(fp->LeaseKey, lctx->LeaseKey,
SMB2_LEASE_KEY_SIZE);
fp->lease_granted = 1;
}
#endif
list_add(&opinfo_new->op_list, &ofile->op_none_list);
atomic_inc(&ofile->op_count);
/*
* adding opinfo in fp will help in identifying opinfo without
* the need of traversing global oplock list in case of
* file close response and oplock break response
*/
fp->ofile = ofile;
return 0;
}
#ifdef CONFIG_CIFS_SMB2_SERVER
/**
* find_opinfo() - find lease object for given client guid and lease key
* @head: oplock list(read,write or none) head