Merge tag 'clk-for-linus-3.19' of git://git.linaro.org/people/mike.turquette/linux

[mirror_ubuntu-artful-kernel.git] / fs / cifs / smb2ops.c

/*
 *  SMB2 version specific operations
 *
 *  Copyright (c) 2012, Jeff Layton <jlayton@redhat.com>
 *
 *  This library is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License v2 as published
 *  by the Free Software Foundation.
 *
 *  This library 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 Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public License
 *  along with this library; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#include <linux/pagemap.h>
#include <linux/vfs.h>
#include <linux/falloc.h>
#include "cifsglob.h"
#include "smb2pdu.h"
#include "smb2proto.h"
#include "cifsproto.h"
#include "cifs_debug.h"
#include "cifs_unicode.h"
#include "smb2status.h"
#include "smb2glob.h"

static int
change_conf(struct TCP_Server_Info *server)
{
        server->credits += server->echo_credits + server->oplock_credits;
        server->oplock_credits = server->echo_credits = 0;
        switch (server->credits) {
        case 0:
                return -1;
        case 1:
                server->echoes = false;
                server->oplocks = false;
                cifs_dbg(VFS, "disabling echoes and oplocks\n");
                break;
        case 2:
                server->echoes = true;
                server->oplocks = false;
                server->echo_credits = 1;
                cifs_dbg(FYI, "disabling oplocks\n");
                break;
        default:
                server->echoes = true;
                server->oplocks = true;
                server->echo_credits = 1;
                server->oplock_credits = 1;
        }
        server->credits -= server->echo_credits + server->oplock_credits;
        return 0;
}

static void
smb2_add_credits(struct TCP_Server_Info *server, const unsigned int add,
                 const int optype)
{
        int *val, rc = 0;
        spin_lock(&server->req_lock);
        val = server->ops->get_credits_field(server, optype);
        *val += add;
        server->in_flight--;
        if (server->in_flight == 0 && (optype & CIFS_OP_MASK) != CIFS_NEG_OP)
                rc = change_conf(server);
        /*
         * Sometimes server returns 0 credits on oplock break ack - we need to
         * rebalance credits in this case.
         */
        else if (server->in_flight > 0 && server->oplock_credits == 0 &&
                 server->oplocks) {
                if (server->credits > 1) {
                        server->credits--;
                        server->oplock_credits++;
                }
        }
        spin_unlock(&server->req_lock);
        wake_up(&server->request_q);
        if (rc)
                cifs_reconnect(server);
}

static void
smb2_set_credits(struct TCP_Server_Info *server, const int val)
{
        spin_lock(&server->req_lock);
        server->credits = val;
        spin_unlock(&server->req_lock);
}

static int *
smb2_get_credits_field(struct TCP_Server_Info *server, const int optype)
{
        switch (optype) {
        case CIFS_ECHO_OP:
                return &server->echo_credits;
        case CIFS_OBREAK_OP:
                return &server->oplock_credits;
        default:
                return &server->credits;
        }
}

static unsigned int
smb2_get_credits(struct mid_q_entry *mid)
{
        return le16_to_cpu(((struct smb2_hdr *)mid->resp_buf)->CreditRequest);
}

static int
smb2_wait_mtu_credits(struct TCP_Server_Info *server, unsigned int size,
                      unsigned int *num, unsigned int *credits)
{
        int rc = 0;
        unsigned int scredits;

        spin_lock(&server->req_lock);
        while (1) {
                if (server->credits <= 0) {
                        spin_unlock(&server->req_lock);
                        cifs_num_waiters_inc(server);
                        rc = wait_event_killable(server->request_q,
                                        has_credits(server, &server->credits));
                        cifs_num_waiters_dec(server);
                        if (rc)
                                return rc;
                        spin_lock(&server->req_lock);
                } else {
                        if (server->tcpStatus == CifsExiting) {
                                spin_unlock(&server->req_lock);
                                return -ENOENT;
                        }

                        scredits = server->credits;
                        /* can deadlock with reopen */
                        if (scredits == 1) {
                                *num = SMB2_MAX_BUFFER_SIZE;
                                *credits = 0;
                                break;
                        }

                        /* leave one credit for a possible reopen */
                        scredits--;
                        *num = min_t(unsigned int, size,
                                     scredits * SMB2_MAX_BUFFER_SIZE);

                        *credits = DIV_ROUND_UP(*num, SMB2_MAX_BUFFER_SIZE);
                        server->credits -= *credits;
                        server->in_flight++;
                        break;
                }
        }
        spin_unlock(&server->req_lock);
        return rc;
}

static __u64
smb2_get_next_mid(struct TCP_Server_Info *server)
{
        __u64 mid;
        /* for SMB2 we need the current value */
        spin_lock(&GlobalMid_Lock);
        mid = server->CurrentMid++;
        spin_unlock(&GlobalMid_Lock);
        return mid;
}

static struct mid_q_entry *
smb2_find_mid(struct TCP_Server_Info *server, char *buf)
{
        struct mid_q_entry *mid;
        struct smb2_hdr *hdr = (struct smb2_hdr *)buf;

        spin_lock(&GlobalMid_Lock);
        list_for_each_entry(mid, &server->pending_mid_q, qhead) {
                if ((mid->mid == hdr->MessageId) &&
                    (mid->mid_state == MID_REQUEST_SUBMITTED) &&
                    (mid->command == hdr->Command)) {
                        spin_unlock(&GlobalMid_Lock);
                        return mid;
                }
        }
        spin_unlock(&GlobalMid_Lock);
        return NULL;
}

static void
smb2_dump_detail(void *buf)
{
#ifdef CONFIG_CIFS_DEBUG2
        struct smb2_hdr *smb = (struct smb2_hdr *)buf;

        cifs_dbg(VFS, "Cmd: %d Err: 0x%x Flags: 0x%x Mid: %llu Pid: %d\n",
                 smb->Command, smb->Status, smb->Flags, smb->MessageId,
                 smb->ProcessId);
        cifs_dbg(VFS, "smb buf %p len %u\n", smb, smb2_calc_size(smb));
#endif
}

static bool
smb2_need_neg(struct TCP_Server_Info *server)
{
        return server->max_read == 0;
}

static int
smb2_negotiate(const unsigned int xid, struct cifs_ses *ses)
{
        int rc;
        ses->server->CurrentMid = 0;
        rc = SMB2_negotiate(xid, ses);
        /* BB we probably don't need to retry with modern servers */
        if (rc == -EAGAIN)
                rc = -EHOSTDOWN;
        return rc;
}

static unsigned int
smb2_negotiate_wsize(struct cifs_tcon *tcon, struct smb_vol *volume_info)
{
        struct TCP_Server_Info *server = tcon->ses->server;
        unsigned int wsize;

        /* start with specified wsize, or default */
        wsize = volume_info->wsize ? volume_info->wsize : CIFS_DEFAULT_IOSIZE;
        wsize = min_t(unsigned int, wsize, server->max_write);

        if (!(server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
                wsize = min_t(unsigned int, wsize, SMB2_MAX_BUFFER_SIZE);

        return wsize;
}

static unsigned int
smb2_negotiate_rsize(struct cifs_tcon *tcon, struct smb_vol *volume_info)
{
        struct TCP_Server_Info *server = tcon->ses->server;
        unsigned int rsize;

        /* start with specified rsize, or default */
        rsize = volume_info->rsize ? volume_info->rsize : CIFS_DEFAULT_IOSIZE;
        rsize = min_t(unsigned int, rsize, server->max_read);

        if (!(server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
                rsize = min_t(unsigned int, rsize, SMB2_MAX_BUFFER_SIZE);

        return rsize;
}

#ifdef CONFIG_CIFS_STATS2
static int
SMB3_request_interfaces(const unsigned int xid, struct cifs_tcon *tcon)
{
        int rc;
        unsigned int ret_data_len = 0;
        struct network_interface_info_ioctl_rsp *out_buf;

        rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
                        FSCTL_QUERY_NETWORK_INTERFACE_INFO, true /* is_fsctl */,
                        NULL /* no data input */, 0 /* no data input */,
                        (char **)&out_buf, &ret_data_len);
        if (rc != 0)
                cifs_dbg(VFS, "error %d on ioctl to get interface list\n", rc);
        else if (ret_data_len < sizeof(struct network_interface_info_ioctl_rsp)) {
                cifs_dbg(VFS, "server returned bad net interface info buf\n");
                rc = -EINVAL;
        } else {
                /* Dump info on first interface */
                cifs_dbg(FYI, "Adapter Capability 0x%x\t",
                        le32_to_cpu(out_buf->Capability));
                cifs_dbg(FYI, "Link Speed %lld\n",
                        le64_to_cpu(out_buf->LinkSpeed));
        }

        return rc;
}
#endif /* STATS2 */

static void
smb3_qfs_tcon(const unsigned int xid, struct cifs_tcon *tcon)
{
        int rc;
        __le16 srch_path = 0; /* Null - open root of share */
        u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
        struct cifs_open_parms oparms;
        struct cifs_fid fid;

        oparms.tcon = tcon;
        oparms.desired_access = FILE_READ_ATTRIBUTES;
        oparms.disposition = FILE_OPEN;
        oparms.create_options = 0;
        oparms.fid = &fid;
        oparms.reconnect = false;

        rc = SMB2_open(xid, &oparms, &srch_path, &oplock, NULL, NULL);
        if (rc)
                return;

#ifdef CONFIG_CIFS_STATS2
        SMB3_request_interfaces(xid, tcon);
#endif /* STATS2 */

        SMB2_QFS_attr(xid, tcon, fid.persistent_fid, fid.volatile_fid,
                        FS_ATTRIBUTE_INFORMATION);
        SMB2_QFS_attr(xid, tcon, fid.persistent_fid, fid.volatile_fid,
                        FS_DEVICE_INFORMATION);
        SMB2_QFS_attr(xid, tcon, fid.persistent_fid, fid.volatile_fid,
                        FS_SECTOR_SIZE_INFORMATION); /* SMB3 specific */
        SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
        return;
}

static void
smb2_qfs_tcon(const unsigned int xid, struct cifs_tcon *tcon)
{
        int rc;
        __le16 srch_path = 0; /* Null - open root of share */
        u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
        struct cifs_open_parms oparms;
        struct cifs_fid fid;

        oparms.tcon = tcon;
        oparms.desired_access = FILE_READ_ATTRIBUTES;
        oparms.disposition = FILE_OPEN;
        oparms.create_options = 0;
        oparms.fid = &fid;
        oparms.reconnect = false;

        rc = SMB2_open(xid, &oparms, &srch_path, &oplock, NULL, NULL);
        if (rc)
                return;

        SMB2_QFS_attr(xid, tcon, fid.persistent_fid, fid.volatile_fid,
                        FS_ATTRIBUTE_INFORMATION);
        SMB2_QFS_attr(xid, tcon, fid.persistent_fid, fid.volatile_fid,
                        FS_DEVICE_INFORMATION);
        SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
        return;
}

static int
smb2_is_path_accessible(const unsigned int xid, struct cifs_tcon *tcon,
                        struct cifs_sb_info *cifs_sb, const char *full_path)
{
        int rc;
        __le16 *utf16_path;
        __u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
        struct cifs_open_parms oparms;
        struct cifs_fid fid;

        utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
        if (!utf16_path)
                return -ENOMEM;

        oparms.tcon = tcon;
        oparms.desired_access = FILE_READ_ATTRIBUTES;
        oparms.disposition = FILE_OPEN;
        oparms.create_options = 0;
        oparms.fid = &fid;
        oparms.reconnect = false;

        rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL);
        if (rc) {
                kfree(utf16_path);
                return rc;
        }

        rc = SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
        kfree(utf16_path);
        return rc;
}

static int
smb2_get_srv_inum(const unsigned int xid, struct cifs_tcon *tcon,
                  struct cifs_sb_info *cifs_sb, const char *full_path,
                  u64 *uniqueid, FILE_ALL_INFO *data)
{
        *uniqueid = le64_to_cpu(data->IndexNumber);
        return 0;
}

static int
smb2_query_file_info(const unsigned int xid, struct cifs_tcon *tcon,
                     struct cifs_fid *fid, FILE_ALL_INFO *data)
{
        int rc;
        struct smb2_file_all_info *smb2_data;

        smb2_data = kzalloc(sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
                            GFP_KERNEL);
        if (smb2_data == NULL)
                return -ENOMEM;

        rc = SMB2_query_info(xid, tcon, fid->persistent_fid, fid->volatile_fid,
                             smb2_data);
        if (!rc)
                move_smb2_info_to_cifs(data, smb2_data);
        kfree(smb2_data);
        return rc;
}

static bool
smb2_can_echo(struct TCP_Server_Info *server)
{
        return server->echoes;
}

static void
smb2_clear_stats(struct cifs_tcon *tcon)
{
#ifdef CONFIG_CIFS_STATS
        int i;
        for (i = 0; i < NUMBER_OF_SMB2_COMMANDS; i++) {
                atomic_set(&tcon->stats.smb2_stats.smb2_com_sent[i], 0);
                atomic_set(&tcon->stats.smb2_stats.smb2_com_failed[i], 0);
        }
#endif
}

static void
smb2_dump_share_caps(struct seq_file *m, struct cifs_tcon *tcon)
{
        seq_puts(m, "\n\tShare Capabilities:");
        if (tcon->capabilities & SMB2_SHARE_CAP_DFS)
                seq_puts(m, " DFS,");
        if (tcon->capabilities & SMB2_SHARE_CAP_CONTINUOUS_AVAILABILITY)
                seq_puts(m, " CONTINUOUS AVAILABILITY,");
        if (tcon->capabilities & SMB2_SHARE_CAP_SCALEOUT)
                seq_puts(m, " SCALEOUT,");
        if (tcon->capabilities & SMB2_SHARE_CAP_CLUSTER)
                seq_puts(m, " CLUSTER,");
        if (tcon->capabilities & SMB2_SHARE_CAP_ASYMMETRIC)
                seq_puts(m, " ASYMMETRIC,");
        if (tcon->capabilities == 0)
                seq_puts(m, " None");
        if (tcon->ss_flags & SSINFO_FLAGS_ALIGNED_DEVICE)
                seq_puts(m, " Aligned,");
        if (tcon->ss_flags & SSINFO_FLAGS_PARTITION_ALIGNED_ON_DEVICE)
                seq_puts(m, " Partition Aligned,");
        if (tcon->ss_flags & SSINFO_FLAGS_NO_SEEK_PENALTY)
                seq_puts(m, " SSD,");
        if (tcon->ss_flags & SSINFO_FLAGS_TRIM_ENABLED)
                seq_puts(m, " TRIM-support,");

        seq_printf(m, "\tShare Flags: 0x%x", tcon->share_flags);
        if (tcon->perf_sector_size)
                seq_printf(m, "\tOptimal sector size: 0x%x",
                           tcon->perf_sector_size);
}

static void
smb2_print_stats(struct seq_file *m, struct cifs_tcon *tcon)
{
#ifdef CONFIG_CIFS_STATS
        atomic_t *sent = tcon->stats.smb2_stats.smb2_com_sent;
        atomic_t *failed = tcon->stats.smb2_stats.smb2_com_failed;
        seq_printf(m, "\nNegotiates: %d sent %d failed",
                   atomic_read(&sent[SMB2_NEGOTIATE_HE]),
                   atomic_read(&failed[SMB2_NEGOTIATE_HE]));
        seq_printf(m, "\nSessionSetups: %d sent %d failed",
                   atomic_read(&sent[SMB2_SESSION_SETUP_HE]),
                   atomic_read(&failed[SMB2_SESSION_SETUP_HE]));
        seq_printf(m, "\nLogoffs: %d sent %d failed",
                   atomic_read(&sent[SMB2_LOGOFF_HE]),
                   atomic_read(&failed[SMB2_LOGOFF_HE]));
        seq_printf(m, "\nTreeConnects: %d sent %d failed",
                   atomic_read(&sent[SMB2_TREE_CONNECT_HE]),
                   atomic_read(&failed[SMB2_TREE_CONNECT_HE]));
        seq_printf(m, "\nTreeDisconnects: %d sent %d failed",
                   atomic_read(&sent[SMB2_TREE_DISCONNECT_HE]),
                   atomic_read(&failed[SMB2_TREE_DISCONNECT_HE]));
        seq_printf(m, "\nCreates: %d sent %d failed",
                   atomic_read(&sent[SMB2_CREATE_HE]),
                   atomic_read(&failed[SMB2_CREATE_HE]));
        seq_printf(m, "\nCloses: %d sent %d failed",
                   atomic_read(&sent[SMB2_CLOSE_HE]),
                   atomic_read(&failed[SMB2_CLOSE_HE]));
        seq_printf(m, "\nFlushes: %d sent %d failed",
                   atomic_read(&sent[SMB2_FLUSH_HE]),
                   atomic_read(&failed[SMB2_FLUSH_HE]));
        seq_printf(m, "\nReads: %d sent %d failed",
                   atomic_read(&sent[SMB2_READ_HE]),
                   atomic_read(&failed[SMB2_READ_HE]));
        seq_printf(m, "\nWrites: %d sent %d failed",
                   atomic_read(&sent[SMB2_WRITE_HE]),
                   atomic_read(&failed[SMB2_WRITE_HE]));
        seq_printf(m, "\nLocks: %d sent %d failed",
                   atomic_read(&sent[SMB2_LOCK_HE]),
                   atomic_read(&failed[SMB2_LOCK_HE]));
        seq_printf(m, "\nIOCTLs: %d sent %d failed",
                   atomic_read(&sent[SMB2_IOCTL_HE]),
                   atomic_read(&failed[SMB2_IOCTL_HE]));
        seq_printf(m, "\nCancels: %d sent %d failed",
                   atomic_read(&sent[SMB2_CANCEL_HE]),
                   atomic_read(&failed[SMB2_CANCEL_HE]));
        seq_printf(m, "\nEchos: %d sent %d failed",
                   atomic_read(&sent[SMB2_ECHO_HE]),
                   atomic_read(&failed[SMB2_ECHO_HE]));
        seq_printf(m, "\nQueryDirectories: %d sent %d failed",
                   atomic_read(&sent[SMB2_QUERY_DIRECTORY_HE]),
                   atomic_read(&failed[SMB2_QUERY_DIRECTORY_HE]));
        seq_printf(m, "\nChangeNotifies: %d sent %d failed",
                   atomic_read(&sent[SMB2_CHANGE_NOTIFY_HE]),
                   atomic_read(&failed[SMB2_CHANGE_NOTIFY_HE]));
        seq_printf(m, "\nQueryInfos: %d sent %d failed",
                   atomic_read(&sent[SMB2_QUERY_INFO_HE]),
                   atomic_read(&failed[SMB2_QUERY_INFO_HE]));
        seq_printf(m, "\nSetInfos: %d sent %d failed",
                   atomic_read(&sent[SMB2_SET_INFO_HE]),
                   atomic_read(&failed[SMB2_SET_INFO_HE]));
        seq_printf(m, "\nOplockBreaks: %d sent %d failed",
                   atomic_read(&sent[SMB2_OPLOCK_BREAK_HE]),
                   atomic_read(&failed[SMB2_OPLOCK_BREAK_HE]));
#endif
}

static void
smb2_set_fid(struct cifsFileInfo *cfile, struct cifs_fid *fid, __u32 oplock)
{
        struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode);
        struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server;

        cfile->fid.persistent_fid = fid->persistent_fid;
        cfile->fid.volatile_fid = fid->volatile_fid;
        server->ops->set_oplock_level(cinode, oplock, fid->epoch,
                                      &fid->purge_cache);
        cinode->can_cache_brlcks = CIFS_CACHE_WRITE(cinode);
}

static void
smb2_close_file(const unsigned int xid, struct cifs_tcon *tcon,
                struct cifs_fid *fid)
{
        SMB2_close(xid, tcon, fid->persistent_fid, fid->volatile_fid);
}

static int
SMB2_request_res_key(const unsigned int xid, struct cifs_tcon *tcon,
                     u64 persistent_fid, u64 volatile_fid,
                     struct copychunk_ioctl *pcchunk)
{
        int rc;
        unsigned int ret_data_len;
        struct resume_key_req *res_key;

        rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
                        FSCTL_SRV_REQUEST_RESUME_KEY, true /* is_fsctl */,
                        NULL, 0 /* no input */,
                        (char **)&res_key, &ret_data_len);

        if (rc) {
                cifs_dbg(VFS, "refcpy ioctl error %d getting resume key\n", rc);
                goto req_res_key_exit;
        }
        if (ret_data_len < sizeof(struct resume_key_req)) {
                cifs_dbg(VFS, "Invalid refcopy resume key length\n");
                rc = -EINVAL;
                goto req_res_key_exit;
        }
        memcpy(pcchunk->SourceKey, res_key->ResumeKey, COPY_CHUNK_RES_KEY_SIZE);

req_res_key_exit:
        kfree(res_key);
        return rc;
}

static int
smb2_clone_range(const unsigned int xid,
                        struct cifsFileInfo *srcfile,
                        struct cifsFileInfo *trgtfile, u64 src_off,
                        u64 len, u64 dest_off)
{
        int rc;
        unsigned int ret_data_len;
        struct copychunk_ioctl *pcchunk;
        struct copychunk_ioctl_rsp *retbuf = NULL;
        struct cifs_tcon *tcon;
        int chunks_copied = 0;
        bool chunk_sizes_updated = false;

        pcchunk = kmalloc(sizeof(struct copychunk_ioctl), GFP_KERNEL);

        if (pcchunk == NULL)
                return -ENOMEM;

        cifs_dbg(FYI, "in smb2_clone_range - about to call request res key\n");
        /* Request a key from the server to identify the source of the copy */
        rc = SMB2_request_res_key(xid, tlink_tcon(srcfile->tlink),
                                srcfile->fid.persistent_fid,
                                srcfile->fid.volatile_fid, pcchunk);

        /* Note: request_res_key sets res_key null only if rc !=0 */
        if (rc)
                goto cchunk_out;

        /* For now array only one chunk long, will make more flexible later */
        pcchunk->ChunkCount = cpu_to_le32(1);
        pcchunk->Reserved = 0;
        pcchunk->Reserved2 = 0;

        tcon = tlink_tcon(trgtfile->tlink);

        while (len > 0) {
                pcchunk->SourceOffset = cpu_to_le64(src_off);
                pcchunk->TargetOffset = cpu_to_le64(dest_off);
                pcchunk->Length =
                        cpu_to_le32(min_t(u32, len, tcon->max_bytes_chunk));

                /* Request server copy to target from src identified by key */
                rc = SMB2_ioctl(xid, tcon, trgtfile->fid.persistent_fid,
                        trgtfile->fid.volatile_fid, FSCTL_SRV_COPYCHUNK_WRITE,
                        true /* is_fsctl */, (char *)pcchunk,
                        sizeof(struct copychunk_ioctl), (char **)&retbuf,
                        &ret_data_len);
                if (rc == 0) {
                        if (ret_data_len !=
                                        sizeof(struct copychunk_ioctl_rsp)) {
                                cifs_dbg(VFS, "invalid cchunk response size\n");
                                rc = -EIO;
                                goto cchunk_out;
                        }
                        if (retbuf->TotalBytesWritten == 0) {
                                cifs_dbg(FYI, "no bytes copied\n");
                                rc = -EIO;
                                goto cchunk_out;
                        }
                        /*
                         * Check if server claimed to write more than we asked
                         */
                        if (le32_to_cpu(retbuf->TotalBytesWritten) >
                            le32_to_cpu(pcchunk->Length)) {
                                cifs_dbg(VFS, "invalid copy chunk response\n");
                                rc = -EIO;
                                goto cchunk_out;
                        }
                        if (le32_to_cpu(retbuf->ChunksWritten) != 1) {
                                cifs_dbg(VFS, "invalid num chunks written\n");
                                rc = -EIO;
                                goto cchunk_out;
                        }
                        chunks_copied++;

                        src_off += le32_to_cpu(retbuf->TotalBytesWritten);
                        dest_off += le32_to_cpu(retbuf->TotalBytesWritten);
                        len -= le32_to_cpu(retbuf->TotalBytesWritten);

                        cifs_dbg(FYI, "Chunks %d PartialChunk %d Total %d\n",
                                le32_to_cpu(retbuf->ChunksWritten),
                                le32_to_cpu(retbuf->ChunkBytesWritten),
                                le32_to_cpu(retbuf->TotalBytesWritten));
                } else if (rc == -EINVAL) {
                        if (ret_data_len != sizeof(struct copychunk_ioctl_rsp))
                                goto cchunk_out;

                        cifs_dbg(FYI, "MaxChunks %d BytesChunk %d MaxCopy %d\n",
                                le32_to_cpu(retbuf->ChunksWritten),
                                le32_to_cpu(retbuf->ChunkBytesWritten),
                                le32_to_cpu(retbuf->TotalBytesWritten));

                        /*
                         * Check if this is the first request using these sizes,
                         * (ie check if copy succeed once with original sizes
                         * and check if the server gave us different sizes after
                         * we already updated max sizes on previous request).
                         * if not then why is the server returning an error now
                         */
                        if ((chunks_copied != 0) || chunk_sizes_updated)
                                goto cchunk_out;

                        /* Check that server is not asking us to grow size */
                        if (le32_to_cpu(retbuf->ChunkBytesWritten) <
                                        tcon->max_bytes_chunk)
                                tcon->max_bytes_chunk =
                                        le32_to_cpu(retbuf->ChunkBytesWritten);
                        else
                                goto cchunk_out; /* server gave us bogus size */

                        /* No need to change MaxChunks since already set to 1 */
                        chunk_sizes_updated = true;
                }
        }

cchunk_out:
        kfree(pcchunk);
        return rc;
}

static int
smb2_flush_file(const unsigned int xid, struct cifs_tcon *tcon,
                struct cifs_fid *fid)
{
        return SMB2_flush(xid, tcon, fid->persistent_fid, fid->volatile_fid);
}

static unsigned int
smb2_read_data_offset(char *buf)
{
        struct smb2_read_rsp *rsp = (struct smb2_read_rsp *)buf;
        return rsp->DataOffset;
}

static unsigned int
smb2_read_data_length(char *buf)
{
        struct smb2_read_rsp *rsp = (struct smb2_read_rsp *)buf;
        return le32_to_cpu(rsp->DataLength);
}


static int
smb2_sync_read(const unsigned int xid, struct cifs_fid *pfid,
               struct cifs_io_parms *parms, unsigned int *bytes_read,
               char **buf, int *buf_type)
{
        parms->persistent_fid = pfid->persistent_fid;
        parms->volatile_fid = pfid->volatile_fid;
        return SMB2_read(xid, parms, bytes_read, buf, buf_type);
}

static int
smb2_sync_write(const unsigned int xid, struct cifs_fid *pfid,
                struct cifs_io_parms *parms, unsigned int *written,
                struct kvec *iov, unsigned long nr_segs)
{

        parms->persistent_fid = pfid->persistent_fid;
        parms->volatile_fid = pfid->volatile_fid;
        return SMB2_write(xid, parms, written, iov, nr_segs);
}

/* Set or clear the SPARSE_FILE attribute based on value passed in setsparse */
static bool smb2_set_sparse(const unsigned int xid, struct cifs_tcon *tcon,
                struct cifsFileInfo *cfile, struct inode *inode, __u8 setsparse)
{
        struct cifsInodeInfo *cifsi;
        int rc;

        cifsi = CIFS_I(inode);

        /* if file already sparse don't bother setting sparse again */
        if ((cifsi->cifsAttrs & FILE_ATTRIBUTE_SPARSE_FILE) && setsparse)
                return true; /* already sparse */

        if (!(cifsi->cifsAttrs & FILE_ATTRIBUTE_SPARSE_FILE) && !setsparse)
                return true; /* already not sparse */

        /*
         * Can't check for sparse support on share the usual way via the
         * FS attribute info (FILE_SUPPORTS_SPARSE_FILES) on the share
         * since Samba server doesn't set the flag on the share, yet
         * supports the set sparse FSCTL and returns sparse correctly
         * in the file attributes. If we fail setting sparse though we
         * mark that server does not support sparse files for this share
         * to avoid repeatedly sending the unsupported fsctl to server
         * if the file is repeatedly extended.
         */
        if (tcon->broken_sparse_sup)
                return false;

        rc = SMB2_ioctl(xid, tcon, cfile->fid.persistent_fid,
                        cfile->fid.volatile_fid, FSCTL_SET_SPARSE,
                        true /* is_fctl */, &setsparse, 1, NULL, NULL);
        if (rc) {
                tcon->broken_sparse_sup = true;
                cifs_dbg(FYI, "set sparse rc = %d\n", rc);
                return false;
        }

        if (setsparse)
                cifsi->cifsAttrs |= FILE_ATTRIBUTE_SPARSE_FILE;
        else
                cifsi->cifsAttrs &= (~FILE_ATTRIBUTE_SPARSE_FILE);

        return true;
}

static int
smb2_set_file_size(const unsigned int xid, struct cifs_tcon *tcon,
                   struct cifsFileInfo *cfile, __u64 size, bool set_alloc)
{
        __le64 eof = cpu_to_le64(size);
        struct inode *inode;

        /*
         * If extending file more than one page make sparse. Many Linux fs
         * make files sparse by default when extending via ftruncate
         */
        inode = cfile->dentry->d_inode;

        if (!set_alloc && (size > inode->i_size + 8192)) {
                __u8 set_sparse = 1;

                /* whether set sparse succeeds or not, extend the file */
                smb2_set_sparse(xid, tcon, cfile, inode, set_sparse);
        }

        return SMB2_set_eof(xid, tcon, cfile->fid.persistent_fid,
                            cfile->fid.volatile_fid, cfile->pid, &eof, false);
}

static int
smb2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
                   struct cifsFileInfo *cfile)
{
        return SMB2_set_compression(xid, tcon, cfile->fid.persistent_fid,
                            cfile->fid.volatile_fid);
}

static int
smb2_query_dir_first(const unsigned int xid, struct cifs_tcon *tcon,
                     const char *path, struct cifs_sb_info *cifs_sb,
                     struct cifs_fid *fid, __u16 search_flags,
                     struct cifs_search_info *srch_inf)
{
        __le16 *utf16_path;
        int rc;
        __u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
        struct cifs_open_parms oparms;

        utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
        if (!utf16_path)
                return -ENOMEM;

        oparms.tcon = tcon;
        oparms.desired_access = FILE_READ_ATTRIBUTES | FILE_READ_DATA;
        oparms.disposition = FILE_OPEN;
        oparms.create_options = 0;
        oparms.fid = fid;
        oparms.reconnect = false;

        rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL);
        kfree(utf16_path);
        if (rc) {
                cifs_dbg(VFS, "open dir failed\n");
                return rc;
        }

        srch_inf->entries_in_buffer = 0;
        srch_inf->index_of_last_entry = 0;

        rc = SMB2_query_directory(xid, tcon, fid->persistent_fid,
                                  fid->volatile_fid, 0, srch_inf);
        if (rc) {
                cifs_dbg(VFS, "query directory failed\n");
                SMB2_close(xid, tcon, fid->persistent_fid, 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 (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)
{
        if (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LEASING)
                return SMB2_lease_break(0, tcon, cinode->lease_key,
                                        smb2_get_lease_state(cinode));

        return SMB2_oplock_break(0, tcon, fid->persistent_fid,
                                 fid->volatile_fid,
                                 CIFS_CACHE_READ(cinode) ? 1 : 0);
}

static int
smb2_queryfs(const unsigned int xid, struct cifs_tcon *tcon,
             struct kstatfs *buf)
{
        int rc;
        __le16 srch_path = 0; /* Null - open root of share */
        u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
        struct cifs_open_parms oparms;
        struct cifs_fid fid;

        oparms.tcon = tcon;
        oparms.desired_access = FILE_READ_ATTRIBUTES;
        oparms.disposition = FILE_OPEN;
        oparms.create_options = 0;
        oparms.fid = &fid;
        oparms.reconnect = false;

        rc = SMB2_open(xid, &oparms, &srch_path, &oplock, NULL, NULL);
        if (rc)
                return rc;
        buf->f_type = SMB2_MAGIC_NUMBER;
        rc = SMB2_QFS_info(xid, tcon, fid.persistent_fid, fid.volatile_fid,
                           buf);
        SMB2_close(xid, tcon, fid.persistent_fid, 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);
}

static void
smb2_get_lease_key(struct inode *inode, struct cifs_fid *fid)
{
        memcpy(fid->lease_key, CIFS_I(inode)->lease_key, SMB2_LEASE_KEY_SIZE);
}

static void
smb2_set_lease_key(struct inode *inode, struct cifs_fid *fid)
{
        memcpy(CIFS_I(inode)->lease_key, fid->lease_key, SMB2_LEASE_KEY_SIZE);
}

static void
smb2_new_lease_key(struct cifs_fid *fid)
{
        get_random_bytes(fid->lease_key, SMB2_LEASE_KEY_SIZE);
}

static int
smb2_query_symlink(const unsigned int xid, struct cifs_tcon *tcon,
                   const char *full_path, char **target_path,
                   struct cifs_sb_info *cifs_sb)
{
        int rc;
        __le16 *utf16_path;
        __u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
        struct cifs_open_parms oparms;
        struct cifs_fid fid;
        struct smb2_err_rsp *err_buf = NULL;
        struct smb2_symlink_err_rsp *symlink;
        unsigned int sub_len, sub_offset;

        cifs_dbg(FYI, "%s: path: %s\n", __func__, full_path);

        utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
        if (!utf16_path)
                return -ENOMEM;

        oparms.tcon = tcon;
        oparms.desired_access = FILE_READ_ATTRIBUTES;
        oparms.disposition = FILE_OPEN;
        oparms.create_options = 0;
        oparms.fid = &fid;
        oparms.reconnect = false;

        rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, &err_buf);

        if (!rc || !err_buf) {
                kfree(utf16_path);
                return -ENOENT;
        }
        /* open must fail on symlink - reset rc */
        rc = 0;
        symlink = (struct smb2_symlink_err_rsp *)err_buf->ErrorData;
        sub_len = le16_to_cpu(symlink->SubstituteNameLength);
        sub_offset = le16_to_cpu(symlink->SubstituteNameOffset);
        *target_path = cifs_strndup_from_utf16(
                                (char *)symlink->PathBuffer + sub_offset,
                                sub_len, true, cifs_sb->local_nls);
        if (!(*target_path)) {
                kfree(utf16_path);
                return -ENOMEM;
        }
        convert_delimiter(*target_path, '/');
        cifs_dbg(FYI, "%s: target path: %s\n", __func__, *target_path);
        kfree(utf16_path);
        return rc;
}

static long smb3_zero_range(struct file *file, struct cifs_tcon *tcon,
                            loff_t offset, loff_t len, bool keep_size)
{
        struct inode *inode;
        struct cifsInodeInfo *cifsi;
        struct cifsFileInfo *cfile = file->private_data;
        struct file_zero_data_information fsctl_buf;
        long rc;
        unsigned int xid;

        xid = get_xid();

        inode = cfile->dentry->d_inode;
        cifsi = CIFS_I(inode);

        /* if file not oplocked can't be sure whether asking to extend size */
        if (!CIFS_CACHE_READ(cifsi))
                if (keep_size == false)
                        return -EOPNOTSUPP;

        /*
         * Must check if file sparse since fallocate -z (zero range) assumes
         * non-sparse allocation
         */
        if (!(cifsi->cifsAttrs & FILE_ATTRIBUTE_SPARSE_FILE))
                return -EOPNOTSUPP;

        /*
         * need to make sure we are not asked to extend the file since the SMB3
         * fsctl does not change the file size. In the future we could change
         * this to zero the first part of the range then set the file size
         * which for a non sparse file would zero the newly extended range
         */
        if (keep_size == false)
                if (i_size_read(inode) < offset + len)
                        return -EOPNOTSUPP;

        cifs_dbg(FYI, "offset %lld len %lld", offset, len);

        fsctl_buf.FileOffset = cpu_to_le64(offset);
        fsctl_buf.BeyondFinalZero = cpu_to_le64(offset + len);

        rc = SMB2_ioctl(xid, tcon, cfile->fid.persistent_fid,
                        cfile->fid.volatile_fid, FSCTL_SET_ZERO_DATA,
                        true /* is_fctl */, (char *)&fsctl_buf,
                        sizeof(struct file_zero_data_information), NULL, NULL);
        free_xid(xid);
        return rc;
}

static long smb3_punch_hole(struct file *file, struct cifs_tcon *tcon,
                            loff_t offset, loff_t len)
{
        struct inode *inode;
        struct cifsInodeInfo *cifsi;
        struct cifsFileInfo *cfile = file->private_data;
        struct file_zero_data_information fsctl_buf;
        long rc;
        unsigned int xid;
        __u8 set_sparse = 1;

        xid = get_xid();

        inode = cfile->dentry->d_inode;
        cifsi = CIFS_I(inode);

        /* Need to make file sparse, if not already, before freeing range. */
        /* Consider adding equivalent for compressed since it could also work */
        if (!smb2_set_sparse(xid, tcon, cfile, inode, set_sparse))
                return -EOPNOTSUPP;

        cifs_dbg(FYI, "offset %lld len %lld", offset, len);

        fsctl_buf.FileOffset = cpu_to_le64(offset);
        fsctl_buf.BeyondFinalZero = cpu_to_le64(offset + len);

        rc = SMB2_ioctl(xid, tcon, cfile->fid.persistent_fid,
                        cfile->fid.volatile_fid, FSCTL_SET_ZERO_DATA,
                        true /* is_fctl */, (char *)&fsctl_buf,
                        sizeof(struct file_zero_data_information), NULL, NULL);
        free_xid(xid);
        return rc;
}

static long smb3_simple_falloc(struct file *file, struct cifs_tcon *tcon,
                            loff_t off, loff_t len, bool keep_size)
{
        struct inode *inode;
        struct cifsInodeInfo *cifsi;
        struct cifsFileInfo *cfile = file->private_data;
        long rc = -EOPNOTSUPP;
        unsigned int xid;

        xid = get_xid();

        inode = cfile->dentry->d_inode;
        cifsi = CIFS_I(inode);

        /* if file not oplocked can't be sure whether asking to extend size */
        if (!CIFS_CACHE_READ(cifsi))
                if (keep_size == false)
                        return -EOPNOTSUPP;

        /*
         * Files are non-sparse by default so falloc may be a no-op
         * Must check if file sparse. If not sparse, and not extending
         * then no need to do anything since file already allocated
         */
        if ((cifsi->cifsAttrs & FILE_ATTRIBUTE_SPARSE_FILE) == 0) {
                if (keep_size == true)
                        return 0;
                /* check if extending file */
                else if (i_size_read(inode) >= off + len)
                        /* not extending file and already not sparse */
                        return 0;
                /* BB: in future add else clause to extend file */
                else
                        return -EOPNOTSUPP;
        }

        if ((keep_size == true) || (i_size_read(inode) >= off + len)) {
                /*
                 * Check if falloc starts within first few pages of file
                 * and ends within a few pages of the end of file to
                 * ensure that most of file is being forced to be
                 * fallocated now. If so then setting whole file sparse
                 * ie potentially making a few extra pages at the beginning
                 * or end of the file non-sparse via set_sparse is harmless.
                 */
                if ((off > 8192) || (off + len + 8192 < i_size_read(inode)))
                        return -EOPNOTSUPP;

                rc = smb2_set_sparse(xid, tcon, cfile, inode, false);
        }
        /* BB: else ... in future add code to extend file and set sparse */


        free_xid(xid);
        return rc;
}


static long smb3_fallocate(struct file *file, struct cifs_tcon *tcon, int mode,
                           loff_t off, loff_t len)
{
        /* KEEP_SIZE already checked for by do_fallocate */
        if (mode & FALLOC_FL_PUNCH_HOLE)
                return smb3_punch_hole(file, tcon, off, len);
        else if (mode & FALLOC_FL_ZERO_RANGE) {
                if (mode & FALLOC_FL_KEEP_SIZE)
                        return smb3_zero_range(file, tcon, off, len, true);
                return smb3_zero_range(file, tcon, off, len, false);
        } else if (mode == FALLOC_FL_KEEP_SIZE)
                return smb3_simple_falloc(file, tcon, off, len, true);
        else if (mode == 0)
                return smb3_simple_falloc(file, tcon, off, len, false);

        return -EOPNOTSUPP;
}

static void
smb2_downgrade_oplock(struct TCP_Server_Info *server,
                        struct cifsInodeInfo *cinode, bool set_level2)
{
        if (set_level2)
                server->ops->set_oplock_level(cinode, SMB2_OPLOCK_LEVEL_II,
                                                0, NULL);
        else
                server->ops->set_oplock_level(cinode, 0, 0, NULL);
}

static void
smb2_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock,
                      unsigned int epoch, bool *purge_cache)
{
        oplock &= 0xFF;
        if (oplock == SMB2_OPLOCK_LEVEL_NOCHANGE)
                return;
        if (oplock == SMB2_OPLOCK_LEVEL_BATCH) {
                cinode->oplock = CIFS_CACHE_RHW_FLG;
                cifs_dbg(FYI, "Batch Oplock granted on inode %p\n",
                         &cinode->vfs_inode);
        } else if (oplock == SMB2_OPLOCK_LEVEL_EXCLUSIVE) {
                cinode->oplock = CIFS_CACHE_RW_FLG;
                cifs_dbg(FYI, "Exclusive Oplock granted on inode %p\n",
                         &cinode->vfs_inode);
        } else if (oplock == SMB2_OPLOCK_LEVEL_II) {
                cinode->oplock = CIFS_CACHE_READ_FLG;
                cifs_dbg(FYI, "Level II Oplock granted on inode %p\n",
                         &cinode->vfs_inode);
        } else
                cinode->oplock = 0;
}

static void
smb21_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock,
                       unsigned int epoch, bool *purge_cache)
{
        char message[5] = {0};

        oplock &= 0xFF;
        if (oplock == SMB2_OPLOCK_LEVEL_NOCHANGE)
                return;

        cinode->oplock = 0;
        if (oplock & SMB2_LEASE_READ_CACHING_HE) {
                cinode->oplock |= CIFS_CACHE_READ_FLG;
                strcat(message, "R");
        }
        if (oplock & SMB2_LEASE_HANDLE_CACHING_HE) {
                cinode->oplock |= CIFS_CACHE_HANDLE_FLG;
                strcat(message, "H");
        }
        if (oplock & SMB2_LEASE_WRITE_CACHING_HE) {
                cinode->oplock |= CIFS_CACHE_WRITE_FLG;
                strcat(message, "W");
        }
        if (!cinode->oplock)
                strcat(message, "None");
        cifs_dbg(FYI, "%s Lease granted on inode %p\n", message,
                 &cinode->vfs_inode);
}

static void
smb3_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock,
                      unsigned int epoch, bool *purge_cache)
{
        unsigned int old_oplock = cinode->oplock;

        smb21_set_oplock_level(cinode, oplock, epoch, purge_cache);

        if (purge_cache) {
                *purge_cache = false;
                if (old_oplock == CIFS_CACHE_READ_FLG) {
                        if (cinode->oplock == CIFS_CACHE_READ_FLG &&
                            (epoch - cinode->epoch > 0))
                                *purge_cache = true;
                        else if (cinode->oplock == CIFS_CACHE_RH_FLG &&
                                 (epoch - cinode->epoch > 1))
                                *purge_cache = true;
                        else if (cinode->oplock == CIFS_CACHE_RHW_FLG &&
                                 (epoch - cinode->epoch > 1))
                                *purge_cache = true;
                        else if (cinode->oplock == 0 &&
                                 (epoch - cinode->epoch > 0))
                                *purge_cache = true;
                } else if (old_oplock == CIFS_CACHE_RH_FLG) {
                        if (cinode->oplock == CIFS_CACHE_RH_FLG &&
                            (epoch - cinode->epoch > 0))
                                *purge_cache = true;
                        else if (cinode->oplock == CIFS_CACHE_RHW_FLG &&
                                 (epoch - cinode->epoch > 1))
                                *purge_cache = true;
                }
                cinode->epoch = epoch;
        }
}

static bool
smb2_is_read_op(__u32 oplock)
{
        return oplock == SMB2_OPLOCK_LEVEL_II;
}

static bool
smb21_is_read_op(__u32 oplock)
{
        return (oplock & SMB2_LEASE_READ_CACHING_HE) &&
               !(oplock & SMB2_LEASE_WRITE_CACHING_HE);
}

static __le32
map_oplock_to_lease(u8 oplock)
{
        if (oplock == SMB2_OPLOCK_LEVEL_EXCLUSIVE)
                return SMB2_LEASE_WRITE_CACHING | SMB2_LEASE_READ_CACHING;
        else if (oplock == SMB2_OPLOCK_LEVEL_II)
                return SMB2_LEASE_READ_CACHING;
        else if (oplock == SMB2_OPLOCK_LEVEL_BATCH)
                return SMB2_LEASE_HANDLE_CACHING | SMB2_LEASE_READ_CACHING |
                       SMB2_LEASE_WRITE_CACHING;
        return 0;
}

static char *
smb2_create_lease_buf(u8 *lease_key, u8 oplock)
{
        struct create_lease *buf;

        buf = kzalloc(sizeof(struct create_lease), GFP_KERNEL);
        if (!buf)
                return NULL;

        buf->lcontext.LeaseKeyLow = cpu_to_le64(*((u64 *)lease_key));
        buf->lcontext.LeaseKeyHigh = cpu_to_le64(*((u64 *)(lease_key + 8)));
        buf->lcontext.LeaseState = map_oplock_to_lease(oplock);

        buf->ccontext.DataOffset = cpu_to_le16(offsetof
                                        (struct create_lease, lcontext));
        buf->ccontext.DataLength = cpu_to_le32(sizeof(struct lease_context));
        buf->ccontext.NameOffset = cpu_to_le16(offsetof
                                (struct create_lease, Name));
        buf->ccontext.NameLength = cpu_to_le16(4);
        /* SMB2_CREATE_REQUEST_LEASE is "RqLs" */
        buf->Name[0] = 'R';
        buf->Name[1] = 'q';
        buf->Name[2] = 'L';
        buf->Name[3] = 's';
        return (char *)buf;
}

static char *
smb3_create_lease_buf(u8 *lease_key, u8 oplock)
{
        struct create_lease_v2 *buf;

        buf = kzalloc(sizeof(struct create_lease_v2), GFP_KERNEL);
        if (!buf)
                return NULL;

        buf->lcontext.LeaseKeyLow = cpu_to_le64(*((u64 *)lease_key));
        buf->lcontext.LeaseKeyHigh = cpu_to_le64(*((u64 *)(lease_key + 8)));
        buf->lcontext.LeaseState = map_oplock_to_lease(oplock);

        buf->ccontext.DataOffset = cpu_to_le16(offsetof
                                        (struct create_lease_v2, lcontext));
        buf->ccontext.DataLength = cpu_to_le32(sizeof(struct lease_context_v2));
        buf->ccontext.NameOffset = cpu_to_le16(offsetof
                                (struct create_lease_v2, Name));
        buf->ccontext.NameLength = cpu_to_le16(4);
        /* SMB2_CREATE_REQUEST_LEASE is "RqLs" */
        buf->Name[0] = 'R';
        buf->Name[1] = 'q';
        buf->Name[2] = 'L';
        buf->Name[3] = 's';
        return (char *)buf;
}

static __u8
smb2_parse_lease_buf(void *buf, unsigned int *epoch)
{
        struct create_lease *lc = (struct create_lease *)buf;

        *epoch = 0; /* not used */
        if (lc->lcontext.LeaseFlags & SMB2_LEASE_FLAG_BREAK_IN_PROGRESS)
                return SMB2_OPLOCK_LEVEL_NOCHANGE;
        return le32_to_cpu(lc->lcontext.LeaseState);
}

static __u8
smb3_parse_lease_buf(void *buf, unsigned int *epoch)
{
        struct create_lease_v2 *lc = (struct create_lease_v2 *)buf;

        *epoch = le16_to_cpu(lc->lcontext.Epoch);
        if (lc->lcontext.LeaseFlags & SMB2_LEASE_FLAG_BREAK_IN_PROGRESS)
                return SMB2_OPLOCK_LEVEL_NOCHANGE;
        return le32_to_cpu(lc->lcontext.LeaseState);
}

static unsigned int
smb2_wp_retry_size(struct inode *inode)
{
        return min_t(unsigned int, CIFS_SB(inode->i_sb)->wsize,
                     SMB2_MAX_BUFFER_SIZE);
}

static bool
smb2_dir_needs_close(struct cifsFileInfo *cfile)
{
        return !cfile->invalidHandle;
}

struct smb_version_operations smb20_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,
        .wait_mtu_credits = cifs_wait_mtu_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,
        .downgrade_oplock = smb2_downgrade_oplock,
        .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,
        .qfs_tcon = smb2_qfs_tcon,
        .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,
        .set_compression = smb2_set_compression,
        .mkdir = smb2_mkdir,
        .mkdir_setinfo = smb2_mkdir_setinfo,
        .rmdir = smb2_rmdir,
        .unlink = smb2_unlink,
        .rename = smb2_rename_path,
        .create_hardlink = smb2_create_hardlink,
        .query_symlink = smb2_query_symlink,
        .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,
        .push_mand_locks = smb2_push_mandatory_locks,
        .get_lease_key = smb2_get_lease_key,
        .set_lease_key = smb2_set_lease_key,
        .new_lease_key = smb2_new_lease_key,
        .calc_signature = smb2_calc_signature,
        .is_read_op = smb2_is_read_op,
        .set_oplock_level = smb2_set_oplock_level,
        .create_lease_buf = smb2_create_lease_buf,
        .parse_lease_buf = smb2_parse_lease_buf,
        .clone_range = smb2_clone_range,
        .wp_retry_size = smb2_wp_retry_size,
        .dir_needs_close = smb2_dir_needs_close,
};

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,
        .wait_mtu_credits = smb2_wait_mtu_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,
        .downgrade_oplock = smb2_downgrade_oplock,
        .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,
        .qfs_tcon = smb2_qfs_tcon,
        .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,
        .set_compression = smb2_set_compression,
        .mkdir = smb2_mkdir,
        .mkdir_setinfo = smb2_mkdir_setinfo,
        .rmdir = smb2_rmdir,
        .unlink = smb2_unlink,
        .rename = smb2_rename_path,
        .create_hardlink = smb2_create_hardlink,
        .query_symlink = smb2_query_symlink,
        .query_mf_symlink = smb3_query_mf_symlink,
        .create_mf_symlink = smb3_create_mf_symlink,
        .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,
        .push_mand_locks = smb2_push_mandatory_locks,
        .get_lease_key = smb2_get_lease_key,
        .set_lease_key = smb2_set_lease_key,
        .new_lease_key = smb2_new_lease_key,
        .calc_signature = smb2_calc_signature,
        .is_read_op = smb21_is_read_op,
        .set_oplock_level = smb21_set_oplock_level,
        .create_lease_buf = smb2_create_lease_buf,
        .parse_lease_buf = smb2_parse_lease_buf,
        .clone_range = smb2_clone_range,
        .wp_retry_size = smb2_wp_retry_size,
        .dir_needs_close = smb2_dir_needs_close,
};

struct smb_version_operations smb30_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,
        .wait_mtu_credits = smb2_wait_mtu_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,
        .dump_share_caps = smb2_dump_share_caps,
        .is_oplock_break = smb2_is_valid_oplock_break,
        .downgrade_oplock = smb2_downgrade_oplock,
        .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,
        .qfs_tcon = smb3_qfs_tcon,
        .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,
        .set_compression = smb2_set_compression,
        .mkdir = smb2_mkdir,
        .mkdir_setinfo = smb2_mkdir_setinfo,
        .rmdir = smb2_rmdir,
        .unlink = smb2_unlink,
        .rename = smb2_rename_path,
        .create_hardlink = smb2_create_hardlink,
        .query_symlink = smb2_query_symlink,
        .query_mf_symlink = smb3_query_mf_symlink,
        .create_mf_symlink = smb3_create_mf_symlink,
        .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,
        .push_mand_locks = smb2_push_mandatory_locks,
        .get_lease_key = smb2_get_lease_key,
        .set_lease_key = smb2_set_lease_key,
        .new_lease_key = smb2_new_lease_key,
        .generate_signingkey = generate_smb3signingkey,
        .calc_signature = smb3_calc_signature,
        .is_read_op = smb21_is_read_op,
        .set_oplock_level = smb3_set_oplock_level,
        .create_lease_buf = smb3_create_lease_buf,
        .parse_lease_buf = smb3_parse_lease_buf,
        .clone_range = smb2_clone_range,
        .validate_negotiate = smb3_validate_negotiate,
        .wp_retry_size = smb2_wp_retry_size,
        .dir_needs_close = smb2_dir_needs_close,
        .fallocate = smb3_fallocate,
};

struct smb_version_values smb20_values = {
        .version_string = SMB20_VERSION_STRING,
        .protocol_id = SMB20_PROT_ID,
        .req_capabilities = 0, /* MBZ */
        .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,
        .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
        .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
        .create_lease_size = sizeof(struct create_lease),
};

struct smb_version_values smb21_values = {
        .version_string = SMB21_VERSION_STRING,
        .protocol_id = SMB21_PROT_ID,
        .req_capabilities = 0, /* MBZ on negotiate req until SMB3 dialect */
        .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,
        .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
        .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
        .create_lease_size = sizeof(struct create_lease),
};

struct smb_version_values smb30_values = {
        .version_string = SMB30_VERSION_STRING,
        .protocol_id = SMB30_PROT_ID,
        .req_capabilities = SMB2_GLOBAL_CAP_DFS | SMB2_GLOBAL_CAP_LEASING | SMB2_GLOBAL_CAP_LARGE_MTU,
        .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,
        .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
        .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
        .create_lease_size = sizeof(struct create_lease_v2),
};

struct smb_version_values smb302_values = {
        .version_string = SMB302_VERSION_STRING,
        .protocol_id = SMB302_PROT_ID,
        .req_capabilities = SMB2_GLOBAL_CAP_DFS | SMB2_GLOBAL_CAP_LEASING | SMB2_GLOBAL_CAP_LARGE_MTU,
        .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,
        .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
        .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
        .create_lease_size = sizeof(struct create_lease_v2),
};