smb2inode.c

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/*
 *   fs/cifs/smb2inode.c
 *
 *   Copyright (C) International Business Machines  Corp., 2002, 2011
 *                 Etersoft, 2012
 *   Author(s): Pavel Shilovsky ([email protected]),
 *              Steve French ([email protected])
 *
 *   This library is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU Lesser General Public License as published
 *   by the Free Software Foundation; either version 2.1 of the License, or
 *   (at your option) any later version.
 *
 *   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/fs.h>
#include <linux/stat.h>
#include <linux/slab.h>
#include <linux/pagemap.h>
#include <asm/div64.h>
#include "cifsfs.h"
#include "cifspdu.h"
#include "cifsglob.h"
#include "cifsproto.h"
#include "cifs_debug.h"
#include "cifs_fs_sb.h"
#include "cifs_unicode.h"
#include "fscache.h"
#include "smb2glob.h"
#include "smb2pdu.h"
#include "smb2proto.h"

static int
smb2_open_op_close(const unsigned int xid, struct cifs_tcon *tcon,
           struct cifs_sb_info *cifs_sb, const char *full_path,
           __u32 desired_access, __u32 create_disposition,
           __u32 file_attributes, __u32 create_options,
           void *data, int command)
{
    int rc, tmprc = 0;
    u64 persistent_fid, volatile_fid;
    __le16 *utf16_path;
    __u8 oplock = SMB2_OPLOCK_LEVEL_NONE;

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

    rc = SMB2_open(xid, tcon, utf16_path, &persistent_fid, &volatile_fid,
               desired_access, create_disposition, file_attributes,
               create_options, &oplock, NULL);
    if (rc) {
        kfree(utf16_path);
        return rc;
    }

    switch (command) {
    case SMB2_OP_DELETE:
        break;
    case SMB2_OP_QUERY_INFO:
        tmprc = SMB2_query_info(xid, tcon, persistent_fid,
                    volatile_fid,
                    (struct smb2_file_all_info *)data);
        break;
    case SMB2_OP_MKDIR:
        /*
         * Directories are created through parameters in the
         * SMB2_open() call.
         */
        break;
    case SMB2_OP_RENAME:
        tmprc = SMB2_rename(xid, tcon, persistent_fid, volatile_fid,
                    (__le16 *)data);
        break;
    case SMB2_OP_HARDLINK:
        tmprc = SMB2_set_hardlink(xid, tcon, persistent_fid,
                      volatile_fid, (__le16 *)data);
        break;
    case SMB2_OP_SET_EOF:
        tmprc = SMB2_set_eof(xid, tcon, persistent_fid, volatile_fid,
                     current->tgid, (__le64 *)data);
        break;
    case SMB2_OP_SET_INFO:
        tmprc = SMB2_set_info(xid, tcon, persistent_fid, volatile_fid,
                      (FILE_BASIC_INFO *)data);
        break;
    default:
        cERROR(1, "Invalid command");
        break;
    }

    rc = SMB2_close(xid, tcon, persistent_fid, volatile_fid);
    if (tmprc)
        rc = tmprc;
    kfree(utf16_path);
    return rc;
}

void
move_smb2_info_to_cifs(FILE_ALL_INFO *dst, struct smb2_file_all_info *src)
{
    memcpy(dst, src, (size_t)(&src->CurrentByteOffset) - (size_t)src);
    dst->CurrentByteOffset = src->CurrentByteOffset;
    dst->Mode = src->Mode;
    dst->AlignmentRequirement = src->AlignmentRequirement;
    dst->IndexNumber1 = 0; /* we don't use it */
}

int
smb2_query_path_info(const unsigned int xid, struct cifs_tcon *tcon,
             struct cifs_sb_info *cifs_sb, const char *full_path,
             FILE_ALL_INFO *data, bool *adjust_tz)
{
    int rc;
    struct smb2_file_all_info *smb2_data;

    *adjust_tz = false;

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

    rc = smb2_open_op_close(xid, tcon, cifs_sb, full_path,
                FILE_READ_ATTRIBUTES, FILE_OPEN, 0, 0,
                smb2_data, SMB2_OP_QUERY_INFO);
    if (rc)
        goto out;

    move_smb2_info_to_cifs(data, smb2_data);
out:
    kfree(smb2_data);
    return rc;
}

int
smb2_mkdir(const unsigned int xid, struct cifs_tcon *tcon, const char *name,
       struct cifs_sb_info *cifs_sb)
{
    return smb2_open_op_close(xid, tcon, cifs_sb, name,
                  FILE_WRITE_ATTRIBUTES, FILE_CREATE, 0,
                  CREATE_NOT_FILE, NULL, SMB2_OP_MKDIR);
}

void
smb2_mkdir_setinfo(struct inode *inode, const char *name,
           struct cifs_sb_info *cifs_sb, struct cifs_tcon *tcon,
           const unsigned int xid)
{
    FILE_BASIC_INFO data;
    struct cifsInodeInfo *cifs_i;
    u32 dosattrs;
    int tmprc;

    memset(&data, 0, sizeof(data));
    cifs_i = CIFS_I(inode);
    dosattrs = cifs_i->cifsAttrs | ATTR_READONLY;
    data.Attributes = cpu_to_le32(dosattrs);
    tmprc = smb2_open_op_close(xid, tcon, cifs_sb, name,
                   FILE_WRITE_ATTRIBUTES, FILE_CREATE, 0,
                   CREATE_NOT_FILE, &data, SMB2_OP_SET_INFO);
    if (tmprc == 0)
        cifs_i->cifsAttrs = dosattrs;
}

int
smb2_rmdir(const unsigned int xid, struct cifs_tcon *tcon, const char *name,
       struct cifs_sb_info *cifs_sb)
{
    return smb2_open_op_close(xid, tcon, cifs_sb, name, DELETE, FILE_OPEN,
                  0, CREATE_NOT_FILE | CREATE_DELETE_ON_CLOSE,
                  NULL, SMB2_OP_DELETE);
}

int
smb2_unlink(const unsigned int xid, struct cifs_tcon *tcon, const char *name,
        struct cifs_sb_info *cifs_sb)
{
    return smb2_open_op_close(xid, tcon, cifs_sb, name, DELETE, FILE_OPEN,
                  0, CREATE_DELETE_ON_CLOSE, NULL,
                  SMB2_OP_DELETE);
}

static int
smb2_set_path_attr(const unsigned int xid, struct cifs_tcon *tcon,
           const char *from_name, const char *to_name,
           struct cifs_sb_info *cifs_sb, __u32 access, int command)
{
    __le16 *smb2_to_name = NULL;
    int rc;

    smb2_to_name = cifs_convert_path_to_utf16(to_name, cifs_sb);
    if (smb2_to_name == NULL) {
        rc = -ENOMEM;
        goto smb2_rename_path;
    }

    rc = smb2_open_op_close(xid, tcon, cifs_sb, from_name, access,
                FILE_OPEN, 0, 0, smb2_to_name, command);
smb2_rename_path:
    kfree(smb2_to_name);
    return rc;
}

int
smb2_rename_path(const unsigned int xid, struct cifs_tcon *tcon,
         const char *from_name, const char *to_name,
         struct cifs_sb_info *cifs_sb)
{
    return smb2_set_path_attr(xid, tcon, from_name, to_name, cifs_sb,
                  DELETE, SMB2_OP_RENAME);
}

int
smb2_create_hardlink(const unsigned int xid, struct cifs_tcon *tcon,
             const char *from_name, const char *to_name,
             struct cifs_sb_info *cifs_sb)
{
    return smb2_set_path_attr(xid, tcon, from_name, to_name, cifs_sb,
                  FILE_READ_ATTRIBUTES, SMB2_OP_HARDLINK);
}

int
smb2_set_path_size(const unsigned int xid, struct cifs_tcon *tcon,
           const char *full_path, __u64 size,
           struct cifs_sb_info *cifs_sb, bool set_alloc)
{
    __le64 eof = cpu_to_le64(size);
    return smb2_open_op_close(xid, tcon, cifs_sb, full_path,
                  FILE_WRITE_DATA, FILE_OPEN, 0, 0, &eof,
                  SMB2_OP_SET_EOF);
}

int
smb2_set_file_info(struct inode *inode, const char *full_path,
           FILE_BASIC_INFO *buf, const unsigned int xid)
{
    struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
    struct tcon_link *tlink;
    int rc;

    tlink = cifs_sb_tlink(cifs_sb);
    if (IS_ERR(tlink))
        return PTR_ERR(tlink);
    rc = smb2_open_op_close(xid, tlink_tcon(tlink), cifs_sb, full_path,
                FILE_WRITE_ATTRIBUTES, FILE_OPEN, 0, 0, buf,
                SMB2_OP_SET_INFO);
    cifs_put_tlink(tlink);
    return rc;
}