forked from Minki/linux
634 lines
18 KiB
C
634 lines
18 KiB
C
/*
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* SMB2 version specific operations
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*
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* Copyright (c) 2012, Jeff Layton <jlayton@redhat.com>
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*
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* This library is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License v2 as published
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* by the Free Software Foundation.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/pagemap.h>
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#include <linux/vfs.h>
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#include "cifsglob.h"
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#include "smb2pdu.h"
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#include "smb2proto.h"
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#include "cifsproto.h"
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#include "cifs_debug.h"
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#include "smb2status.h"
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#include "smb2glob.h"
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static int
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change_conf(struct TCP_Server_Info *server)
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{
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server->credits += server->echo_credits + server->oplock_credits;
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server->oplock_credits = server->echo_credits = 0;
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switch (server->credits) {
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case 0:
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return -1;
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case 1:
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server->echoes = false;
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server->oplocks = false;
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cERROR(1, "disabling echoes and oplocks");
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break;
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case 2:
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server->echoes = true;
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server->oplocks = false;
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server->echo_credits = 1;
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cFYI(1, "disabling oplocks");
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break;
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default:
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server->echoes = true;
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server->oplocks = true;
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server->echo_credits = 1;
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server->oplock_credits = 1;
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}
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server->credits -= server->echo_credits + server->oplock_credits;
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return 0;
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}
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static void
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smb2_add_credits(struct TCP_Server_Info *server, const unsigned int add,
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const int optype)
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{
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int *val, rc = 0;
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spin_lock(&server->req_lock);
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val = server->ops->get_credits_field(server, optype);
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*val += add;
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server->in_flight--;
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if (server->in_flight == 0 && (optype & CIFS_OP_MASK) != CIFS_NEG_OP)
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rc = change_conf(server);
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/*
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* Sometimes server returns 0 credits on oplock break ack - we need to
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* rebalance credits in this case.
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*/
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else if (server->in_flight > 0 && server->oplock_credits == 0 &&
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server->oplocks) {
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if (server->credits > 1) {
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server->credits--;
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server->oplock_credits++;
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}
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}
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spin_unlock(&server->req_lock);
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wake_up(&server->request_q);
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if (rc)
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cifs_reconnect(server);
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}
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static void
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smb2_set_credits(struct TCP_Server_Info *server, const int val)
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{
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spin_lock(&server->req_lock);
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server->credits = val;
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spin_unlock(&server->req_lock);
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}
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static int *
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smb2_get_credits_field(struct TCP_Server_Info *server, const int optype)
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{
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switch (optype) {
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case CIFS_ECHO_OP:
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return &server->echo_credits;
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case CIFS_OBREAK_OP:
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return &server->oplock_credits;
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default:
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return &server->credits;
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}
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}
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static unsigned int
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smb2_get_credits(struct mid_q_entry *mid)
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{
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return le16_to_cpu(((struct smb2_hdr *)mid->resp_buf)->CreditRequest);
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}
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static __u64
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smb2_get_next_mid(struct TCP_Server_Info *server)
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{
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__u64 mid;
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/* for SMB2 we need the current value */
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spin_lock(&GlobalMid_Lock);
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mid = server->CurrentMid++;
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spin_unlock(&GlobalMid_Lock);
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return mid;
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}
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static struct mid_q_entry *
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smb2_find_mid(struct TCP_Server_Info *server, char *buf)
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{
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struct mid_q_entry *mid;
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struct smb2_hdr *hdr = (struct smb2_hdr *)buf;
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spin_lock(&GlobalMid_Lock);
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list_for_each_entry(mid, &server->pending_mid_q, qhead) {
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if ((mid->mid == hdr->MessageId) &&
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(mid->mid_state == MID_REQUEST_SUBMITTED) &&
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(mid->command == hdr->Command)) {
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spin_unlock(&GlobalMid_Lock);
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return mid;
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}
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}
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spin_unlock(&GlobalMid_Lock);
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return NULL;
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}
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static void
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smb2_dump_detail(void *buf)
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{
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#ifdef CONFIG_CIFS_DEBUG2
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struct smb2_hdr *smb = (struct smb2_hdr *)buf;
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cERROR(1, "Cmd: %d Err: 0x%x Flags: 0x%x Mid: %llu Pid: %d",
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smb->Command, smb->Status, smb->Flags, smb->MessageId,
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smb->ProcessId);
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cERROR(1, "smb buf %p len %u", smb, smb2_calc_size(smb));
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#endif
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}
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static bool
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smb2_need_neg(struct TCP_Server_Info *server)
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{
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return server->max_read == 0;
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}
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static int
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smb2_negotiate(const unsigned int xid, struct cifs_ses *ses)
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{
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int rc;
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ses->server->CurrentMid = 0;
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rc = SMB2_negotiate(xid, ses);
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/* BB we probably don't need to retry with modern servers */
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if (rc == -EAGAIN)
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rc = -EHOSTDOWN;
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return rc;
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}
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static unsigned int
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smb2_negotiate_wsize(struct cifs_tcon *tcon, struct smb_vol *volume_info)
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{
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struct TCP_Server_Info *server = tcon->ses->server;
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unsigned int wsize;
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/* start with specified wsize, or default */
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wsize = volume_info->wsize ? volume_info->wsize : CIFS_DEFAULT_IOSIZE;
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wsize = min_t(unsigned int, wsize, server->max_write);
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/*
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* limit write size to 2 ** 16, because we don't support multicredit
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* requests now.
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*/
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wsize = min_t(unsigned int, wsize, 2 << 15);
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return wsize;
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}
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static unsigned int
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smb2_negotiate_rsize(struct cifs_tcon *tcon, struct smb_vol *volume_info)
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{
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struct TCP_Server_Info *server = tcon->ses->server;
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unsigned int rsize;
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/* start with specified rsize, or default */
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rsize = volume_info->rsize ? volume_info->rsize : CIFS_DEFAULT_IOSIZE;
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rsize = min_t(unsigned int, rsize, server->max_read);
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/*
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* limit write size to 2 ** 16, because we don't support multicredit
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* requests now.
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*/
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rsize = min_t(unsigned int, rsize, 2 << 15);
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return rsize;
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}
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static int
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smb2_is_path_accessible(const unsigned int xid, struct cifs_tcon *tcon,
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struct cifs_sb_info *cifs_sb, const char *full_path)
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{
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int rc;
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__u64 persistent_fid, volatile_fid;
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__le16 *utf16_path;
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__u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
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utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
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if (!utf16_path)
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return -ENOMEM;
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rc = SMB2_open(xid, tcon, utf16_path, &persistent_fid, &volatile_fid,
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FILE_READ_ATTRIBUTES, FILE_OPEN, 0, 0, &oplock, NULL);
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if (rc) {
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kfree(utf16_path);
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return rc;
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}
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rc = SMB2_close(xid, tcon, persistent_fid, volatile_fid);
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kfree(utf16_path);
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return rc;
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}
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static int
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smb2_get_srv_inum(const unsigned int xid, struct cifs_tcon *tcon,
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struct cifs_sb_info *cifs_sb, const char *full_path,
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u64 *uniqueid, FILE_ALL_INFO *data)
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{
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*uniqueid = le64_to_cpu(data->IndexNumber);
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return 0;
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}
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static int
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smb2_query_file_info(const unsigned int xid, struct cifs_tcon *tcon,
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struct cifs_fid *fid, FILE_ALL_INFO *data)
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{
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int rc;
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struct smb2_file_all_info *smb2_data;
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smb2_data = kzalloc(sizeof(struct smb2_file_all_info) + MAX_NAME * 2,
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GFP_KERNEL);
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if (smb2_data == NULL)
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return -ENOMEM;
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rc = SMB2_query_info(xid, tcon, fid->persistent_fid, fid->volatile_fid,
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smb2_data);
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if (!rc)
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move_smb2_info_to_cifs(data, smb2_data);
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kfree(smb2_data);
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return rc;
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}
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static char *
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smb2_build_path_to_root(struct smb_vol *vol, struct cifs_sb_info *cifs_sb,
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struct cifs_tcon *tcon)
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{
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int pplen = vol->prepath ? strlen(vol->prepath) : 0;
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char *full_path = NULL;
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/* if no prefix path, simply set path to the root of share to "" */
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if (pplen == 0) {
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full_path = kzalloc(2, GFP_KERNEL);
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return full_path;
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}
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cERROR(1, "prefixpath is not supported for SMB2 now");
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return NULL;
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}
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static bool
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smb2_can_echo(struct TCP_Server_Info *server)
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{
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return server->echoes;
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}
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static void
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smb2_clear_stats(struct cifs_tcon *tcon)
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{
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#ifdef CONFIG_CIFS_STATS
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int i;
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for (i = 0; i < NUMBER_OF_SMB2_COMMANDS; i++) {
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atomic_set(&tcon->stats.smb2_stats.smb2_com_sent[i], 0);
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atomic_set(&tcon->stats.smb2_stats.smb2_com_failed[i], 0);
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}
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#endif
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}
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static void
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smb2_print_stats(struct seq_file *m, struct cifs_tcon *tcon)
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{
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#ifdef CONFIG_CIFS_STATS
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atomic_t *sent = tcon->stats.smb2_stats.smb2_com_sent;
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atomic_t *failed = tcon->stats.smb2_stats.smb2_com_failed;
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seq_printf(m, "\nNegotiates: %d sent %d failed",
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atomic_read(&sent[SMB2_NEGOTIATE_HE]),
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atomic_read(&failed[SMB2_NEGOTIATE_HE]));
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seq_printf(m, "\nSessionSetups: %d sent %d failed",
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atomic_read(&sent[SMB2_SESSION_SETUP_HE]),
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atomic_read(&failed[SMB2_SESSION_SETUP_HE]));
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#define SMB2LOGOFF 0x0002 /* trivial request/resp */
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seq_printf(m, "\nLogoffs: %d sent %d failed",
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atomic_read(&sent[SMB2_LOGOFF_HE]),
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atomic_read(&failed[SMB2_LOGOFF_HE]));
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seq_printf(m, "\nTreeConnects: %d sent %d failed",
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atomic_read(&sent[SMB2_TREE_CONNECT_HE]),
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atomic_read(&failed[SMB2_TREE_CONNECT_HE]));
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seq_printf(m, "\nTreeDisconnects: %d sent %d failed",
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atomic_read(&sent[SMB2_TREE_DISCONNECT_HE]),
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atomic_read(&failed[SMB2_TREE_DISCONNECT_HE]));
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seq_printf(m, "\nCreates: %d sent %d failed",
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atomic_read(&sent[SMB2_CREATE_HE]),
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atomic_read(&failed[SMB2_CREATE_HE]));
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seq_printf(m, "\nCloses: %d sent %d failed",
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atomic_read(&sent[SMB2_CLOSE_HE]),
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atomic_read(&failed[SMB2_CLOSE_HE]));
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seq_printf(m, "\nFlushes: %d sent %d failed",
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atomic_read(&sent[SMB2_FLUSH_HE]),
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atomic_read(&failed[SMB2_FLUSH_HE]));
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seq_printf(m, "\nReads: %d sent %d failed",
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atomic_read(&sent[SMB2_READ_HE]),
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atomic_read(&failed[SMB2_READ_HE]));
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seq_printf(m, "\nWrites: %d sent %d failed",
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atomic_read(&sent[SMB2_WRITE_HE]),
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atomic_read(&failed[SMB2_WRITE_HE]));
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seq_printf(m, "\nLocks: %d sent %d failed",
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atomic_read(&sent[SMB2_LOCK_HE]),
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atomic_read(&failed[SMB2_LOCK_HE]));
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seq_printf(m, "\nIOCTLs: %d sent %d failed",
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atomic_read(&sent[SMB2_IOCTL_HE]),
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atomic_read(&failed[SMB2_IOCTL_HE]));
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seq_printf(m, "\nCancels: %d sent %d failed",
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atomic_read(&sent[SMB2_CANCEL_HE]),
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atomic_read(&failed[SMB2_CANCEL_HE]));
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seq_printf(m, "\nEchos: %d sent %d failed",
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atomic_read(&sent[SMB2_ECHO_HE]),
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atomic_read(&failed[SMB2_ECHO_HE]));
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seq_printf(m, "\nQueryDirectories: %d sent %d failed",
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atomic_read(&sent[SMB2_QUERY_DIRECTORY_HE]),
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atomic_read(&failed[SMB2_QUERY_DIRECTORY_HE]));
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seq_printf(m, "\nChangeNotifies: %d sent %d failed",
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atomic_read(&sent[SMB2_CHANGE_NOTIFY_HE]),
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atomic_read(&failed[SMB2_CHANGE_NOTIFY_HE]));
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seq_printf(m, "\nQueryInfos: %d sent %d failed",
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atomic_read(&sent[SMB2_QUERY_INFO_HE]),
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atomic_read(&failed[SMB2_QUERY_INFO_HE]));
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seq_printf(m, "\nSetInfos: %d sent %d failed",
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atomic_read(&sent[SMB2_SET_INFO_HE]),
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atomic_read(&failed[SMB2_SET_INFO_HE]));
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seq_printf(m, "\nOplockBreaks: %d sent %d failed",
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atomic_read(&sent[SMB2_OPLOCK_BREAK_HE]),
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atomic_read(&failed[SMB2_OPLOCK_BREAK_HE]));
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#endif
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}
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static void
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smb2_set_fid(struct cifsFileInfo *cfile, struct cifs_fid *fid, __u32 oplock)
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{
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struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode);
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cfile->fid.persistent_fid = fid->persistent_fid;
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cfile->fid.volatile_fid = fid->volatile_fid;
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smb2_set_oplock_level(cinode, oplock);
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/* cinode->can_cache_brlcks = cinode->clientCanCacheAll; */
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}
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static int
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smb2_close_file(const unsigned int xid, struct cifs_tcon *tcon,
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struct cifs_fid *fid)
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{
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return SMB2_close(xid, tcon, fid->persistent_fid, fid->volatile_fid);
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}
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static int
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smb2_flush_file(const unsigned int xid, struct cifs_tcon *tcon,
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struct cifs_fid *fid)
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{
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return SMB2_flush(xid, tcon, fid->persistent_fid, fid->volatile_fid);
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}
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static unsigned int
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smb2_read_data_offset(char *buf)
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{
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struct smb2_read_rsp *rsp = (struct smb2_read_rsp *)buf;
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return rsp->DataOffset;
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}
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static unsigned int
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smb2_read_data_length(char *buf)
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{
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struct smb2_read_rsp *rsp = (struct smb2_read_rsp *)buf;
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return le32_to_cpu(rsp->DataLength);
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}
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static int
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smb2_sync_read(const unsigned int xid, struct cifsFileInfo *cfile,
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struct cifs_io_parms *parms, unsigned int *bytes_read,
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char **buf, int *buf_type)
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{
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parms->persistent_fid = cfile->fid.persistent_fid;
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parms->volatile_fid = cfile->fid.volatile_fid;
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return SMB2_read(xid, parms, bytes_read, buf, buf_type);
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}
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static int
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smb2_sync_write(const unsigned int xid, struct cifsFileInfo *cfile,
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struct cifs_io_parms *parms, unsigned int *written,
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struct kvec *iov, unsigned long nr_segs)
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{
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parms->persistent_fid = cfile->fid.persistent_fid;
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parms->volatile_fid = cfile->fid.volatile_fid;
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return SMB2_write(xid, parms, written, iov, nr_segs);
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}
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static int
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smb2_set_file_size(const unsigned int xid, struct cifs_tcon *tcon,
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struct cifsFileInfo *cfile, __u64 size, bool set_alloc)
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{
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__le64 eof = cpu_to_le64(size);
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return SMB2_set_eof(xid, tcon, cfile->fid.persistent_fid,
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cfile->fid.volatile_fid, cfile->pid, &eof);
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}
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static int
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smb2_query_dir_first(const unsigned int xid, struct cifs_tcon *tcon,
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const char *path, struct cifs_sb_info *cifs_sb,
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struct cifs_fid *fid, __u16 search_flags,
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struct cifs_search_info *srch_inf)
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{
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__le16 *utf16_path;
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int rc;
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__u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
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__u64 persistent_fid, volatile_fid;
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utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
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if (!utf16_path)
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return -ENOMEM;
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rc = SMB2_open(xid, tcon, utf16_path, &persistent_fid, &volatile_fid,
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FILE_READ_ATTRIBUTES | FILE_READ_DATA, FILE_OPEN, 0, 0,
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&oplock, NULL);
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kfree(utf16_path);
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if (rc) {
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cERROR(1, "open dir failed");
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return rc;
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}
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srch_inf->entries_in_buffer = 0;
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srch_inf->index_of_last_entry = 0;
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fid->persistent_fid = persistent_fid;
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fid->volatile_fid = volatile_fid;
|
|
|
|
rc = SMB2_query_directory(xid, tcon, persistent_fid, volatile_fid, 0,
|
|
srch_inf);
|
|
if (rc) {
|
|
cERROR(1, "query directory failed");
|
|
SMB2_close(xid, tcon, persistent_fid, volatile_fid);
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
static int
|
|
smb2_query_dir_next(const unsigned int xid, struct cifs_tcon *tcon,
|
|
struct cifs_fid *fid, __u16 search_flags,
|
|
struct cifs_search_info *srch_inf)
|
|
{
|
|
return SMB2_query_directory(xid, tcon, fid->persistent_fid,
|
|
fid->volatile_fid, 0, srch_inf);
|
|
}
|
|
|
|
static int
|
|
smb2_close_dir(const unsigned int xid, struct cifs_tcon *tcon,
|
|
struct cifs_fid *fid)
|
|
{
|
|
return SMB2_close(xid, tcon, fid->persistent_fid, fid->volatile_fid);
|
|
}
|
|
|
|
/*
|
|
* If we negotiate SMB2 protocol and get STATUS_PENDING - update
|
|
* the number of credits and return true. Otherwise - return false.
|
|
*/
|
|
static bool
|
|
smb2_is_status_pending(char *buf, struct TCP_Server_Info *server, int length)
|
|
{
|
|
struct smb2_hdr *hdr = (struct smb2_hdr *)buf;
|
|
|
|
if (le32_to_cpu(hdr->Status) != STATUS_PENDING)
|
|
return false;
|
|
|
|
if (!length) {
|
|
spin_lock(&server->req_lock);
|
|
server->credits += le16_to_cpu(hdr->CreditRequest);
|
|
spin_unlock(&server->req_lock);
|
|
wake_up(&server->request_q);
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
static int
|
|
smb2_oplock_response(struct cifs_tcon *tcon, struct cifs_fid *fid,
|
|
struct cifsInodeInfo *cinode)
|
|
{
|
|
return SMB2_oplock_break(0, tcon, fid->persistent_fid,
|
|
fid->volatile_fid,
|
|
cinode->clientCanCacheRead ? 1 : 0);
|
|
}
|
|
|
|
static int
|
|
smb2_queryfs(const unsigned int xid, struct cifs_tcon *tcon,
|
|
struct kstatfs *buf)
|
|
{
|
|
int rc;
|
|
u64 persistent_fid, volatile_fid;
|
|
__le16 srch_path = 0; /* Null - open root of share */
|
|
u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
|
|
|
|
rc = SMB2_open(xid, tcon, &srch_path, &persistent_fid, &volatile_fid,
|
|
FILE_READ_ATTRIBUTES, FILE_OPEN, 0, 0, &oplock, NULL);
|
|
if (rc)
|
|
return rc;
|
|
buf->f_type = SMB2_MAGIC_NUMBER;
|
|
rc = SMB2_QFS_info(xid, tcon, persistent_fid, volatile_fid, buf);
|
|
SMB2_close(xid, tcon, persistent_fid, volatile_fid);
|
|
return rc;
|
|
}
|
|
|
|
static bool
|
|
smb2_compare_fids(struct cifsFileInfo *ob1, struct cifsFileInfo *ob2)
|
|
{
|
|
return ob1->fid.persistent_fid == ob2->fid.persistent_fid &&
|
|
ob1->fid.volatile_fid == ob2->fid.volatile_fid;
|
|
}
|
|
|
|
static int
|
|
smb2_mand_lock(const unsigned int xid, struct cifsFileInfo *cfile, __u64 offset,
|
|
__u64 length, __u32 type, int lock, int unlock, bool wait)
|
|
{
|
|
if (unlock && !lock)
|
|
type = SMB2_LOCKFLAG_UNLOCK;
|
|
return SMB2_lock(xid, tlink_tcon(cfile->tlink),
|
|
cfile->fid.persistent_fid, cfile->fid.volatile_fid,
|
|
current->tgid, length, offset, type, wait);
|
|
}
|
|
|
|
struct smb_version_operations smb21_operations = {
|
|
.compare_fids = smb2_compare_fids,
|
|
.setup_request = smb2_setup_request,
|
|
.setup_async_request = smb2_setup_async_request,
|
|
.check_receive = smb2_check_receive,
|
|
.add_credits = smb2_add_credits,
|
|
.set_credits = smb2_set_credits,
|
|
.get_credits_field = smb2_get_credits_field,
|
|
.get_credits = smb2_get_credits,
|
|
.get_next_mid = smb2_get_next_mid,
|
|
.read_data_offset = smb2_read_data_offset,
|
|
.read_data_length = smb2_read_data_length,
|
|
.map_error = map_smb2_to_linux_error,
|
|
.find_mid = smb2_find_mid,
|
|
.check_message = smb2_check_message,
|
|
.dump_detail = smb2_dump_detail,
|
|
.clear_stats = smb2_clear_stats,
|
|
.print_stats = smb2_print_stats,
|
|
.is_oplock_break = smb2_is_valid_oplock_break,
|
|
.need_neg = smb2_need_neg,
|
|
.negotiate = smb2_negotiate,
|
|
.negotiate_wsize = smb2_negotiate_wsize,
|
|
.negotiate_rsize = smb2_negotiate_rsize,
|
|
.sess_setup = SMB2_sess_setup,
|
|
.logoff = SMB2_logoff,
|
|
.tree_connect = SMB2_tcon,
|
|
.tree_disconnect = SMB2_tdis,
|
|
.is_path_accessible = smb2_is_path_accessible,
|
|
.can_echo = smb2_can_echo,
|
|
.echo = SMB2_echo,
|
|
.query_path_info = smb2_query_path_info,
|
|
.get_srv_inum = smb2_get_srv_inum,
|
|
.query_file_info = smb2_query_file_info,
|
|
.set_path_size = smb2_set_path_size,
|
|
.set_file_size = smb2_set_file_size,
|
|
.set_file_info = smb2_set_file_info,
|
|
.build_path_to_root = smb2_build_path_to_root,
|
|
.mkdir = smb2_mkdir,
|
|
.mkdir_setinfo = smb2_mkdir_setinfo,
|
|
.rmdir = smb2_rmdir,
|
|
.unlink = smb2_unlink,
|
|
.rename = smb2_rename_path,
|
|
.create_hardlink = smb2_create_hardlink,
|
|
.open = smb2_open_file,
|
|
.set_fid = smb2_set_fid,
|
|
.close = smb2_close_file,
|
|
.flush = smb2_flush_file,
|
|
.async_readv = smb2_async_readv,
|
|
.async_writev = smb2_async_writev,
|
|
.sync_read = smb2_sync_read,
|
|
.sync_write = smb2_sync_write,
|
|
.query_dir_first = smb2_query_dir_first,
|
|
.query_dir_next = smb2_query_dir_next,
|
|
.close_dir = smb2_close_dir,
|
|
.calc_smb_size = smb2_calc_size,
|
|
.is_status_pending = smb2_is_status_pending,
|
|
.oplock_response = smb2_oplock_response,
|
|
.queryfs = smb2_queryfs,
|
|
.mand_lock = smb2_mand_lock,
|
|
.mand_unlock_range = smb2_unlock_range,
|
|
};
|
|
|
|
struct smb_version_values smb21_values = {
|
|
.version_string = SMB21_VERSION_STRING,
|
|
.large_lock_type = 0,
|
|
.exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
|
|
.shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
|
|
.unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
|
|
.header_size = sizeof(struct smb2_hdr),
|
|
.max_header_size = MAX_SMB2_HDR_SIZE,
|
|
.read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
|
|
.lock_cmd = SMB2_LOCK,
|
|
.cap_unix = 0,
|
|
.cap_nt_find = SMB2_NT_FIND,
|
|
.cap_large_files = SMB2_LARGE_FILES,
|
|
};
|