301 строка
8.0 KiB
C
301 строка
8.0 KiB
C
/*
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* fs/cifs/smb2file.c
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*
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* Copyright (C) International Business Machines Corp., 2002, 2011
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* Author(s): Steve French (sfrench@us.ibm.com),
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* Pavel Shilovsky ((pshilovsky@samba.org) 2012
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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 Lesser General Public License as published
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* by the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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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/fs.h>
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#include <linux/stat.h>
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#include <linux/slab.h>
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#include <linux/pagemap.h>
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#include <asm/div64.h>
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#include "cifsfs.h"
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#include "cifspdu.h"
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#include "cifsglob.h"
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#include "cifsproto.h"
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#include "cifs_debug.h"
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#include "cifs_fs_sb.h"
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#include "cifs_unicode.h"
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#include "fscache.h"
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#include "smb2proto.h"
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int
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smb2_open_file(const unsigned int xid, struct cifs_open_parms *oparms,
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__u32 *oplock, FILE_ALL_INFO *buf)
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{
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int rc;
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__le16 *smb2_path;
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struct smb2_file_all_info *smb2_data = NULL;
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__u8 smb2_oplock;
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struct cifs_fid *fid = oparms->fid;
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struct network_resiliency_req nr_ioctl_req;
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smb2_path = cifs_convert_path_to_utf16(oparms->path, oparms->cifs_sb);
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if (smb2_path == NULL) {
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rc = -ENOMEM;
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goto out;
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}
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smb2_data = kzalloc(sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
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GFP_KERNEL);
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if (smb2_data == NULL) {
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rc = -ENOMEM;
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goto out;
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}
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oparms->desired_access |= FILE_READ_ATTRIBUTES;
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smb2_oplock = SMB2_OPLOCK_LEVEL_BATCH;
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rc = SMB2_open(xid, oparms, smb2_path, &smb2_oplock, smb2_data, NULL,
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NULL, NULL);
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if (rc)
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goto out;
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if (oparms->tcon->use_resilient) {
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/* default timeout is 0, servers pick default (120 seconds) */
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nr_ioctl_req.Timeout =
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cpu_to_le32(oparms->tcon->handle_timeout);
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nr_ioctl_req.Reserved = 0;
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rc = SMB2_ioctl(xid, oparms->tcon, fid->persistent_fid,
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fid->volatile_fid, FSCTL_LMR_REQUEST_RESILIENCY,
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true /* is_fsctl */,
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(char *)&nr_ioctl_req, sizeof(nr_ioctl_req),
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CIFSMaxBufSize, NULL, NULL /* no return info */);
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if (rc == -EOPNOTSUPP) {
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cifs_dbg(VFS,
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"resiliency not supported by server, disabling\n");
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oparms->tcon->use_resilient = false;
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} else if (rc)
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cifs_dbg(FYI, "error %d setting resiliency\n", rc);
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rc = 0;
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}
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if (buf) {
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/* if open response does not have IndexNumber field - get it */
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if (smb2_data->IndexNumber == 0) {
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rc = SMB2_get_srv_num(xid, oparms->tcon,
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fid->persistent_fid,
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fid->volatile_fid,
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&smb2_data->IndexNumber);
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if (rc) {
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/*
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* let get_inode_info disable server inode
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* numbers
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*/
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smb2_data->IndexNumber = 0;
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rc = 0;
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}
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}
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move_smb2_info_to_cifs(buf, smb2_data);
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}
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*oplock = smb2_oplock;
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out:
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kfree(smb2_data);
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kfree(smb2_path);
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return rc;
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}
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int
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smb2_unlock_range(struct cifsFileInfo *cfile, struct file_lock *flock,
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const unsigned int xid)
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{
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int rc = 0, stored_rc;
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unsigned int max_num, num = 0, max_buf;
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struct smb2_lock_element *buf, *cur;
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struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
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struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry));
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struct cifsLockInfo *li, *tmp;
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__u64 length = 1 + flock->fl_end - flock->fl_start;
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struct list_head tmp_llist;
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INIT_LIST_HEAD(&tmp_llist);
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/*
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* Accessing maxBuf is racy with cifs_reconnect - need to store value
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* and check it before using.
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*/
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max_buf = tcon->ses->server->maxBuf;
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if (max_buf < sizeof(struct smb2_lock_element))
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return -EINVAL;
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BUILD_BUG_ON(sizeof(struct smb2_lock_element) > PAGE_SIZE);
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max_buf = min_t(unsigned int, max_buf, PAGE_SIZE);
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max_num = max_buf / sizeof(struct smb2_lock_element);
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buf = kcalloc(max_num, sizeof(struct smb2_lock_element), GFP_KERNEL);
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if (!buf)
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return -ENOMEM;
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cur = buf;
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cifs_down_write(&cinode->lock_sem);
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list_for_each_entry_safe(li, tmp, &cfile->llist->locks, llist) {
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if (flock->fl_start > li->offset ||
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(flock->fl_start + length) <
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(li->offset + li->length))
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continue;
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if (current->tgid != li->pid)
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/*
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* flock and OFD lock are associated with an open
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* file description, not the process.
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*/
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if (!(flock->fl_flags & (FL_FLOCK | FL_OFDLCK)))
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continue;
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if (cinode->can_cache_brlcks) {
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/*
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* We can cache brlock requests - simply remove a lock
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* from the file's list.
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*/
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list_del(&li->llist);
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cifs_del_lock_waiters(li);
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kfree(li);
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continue;
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}
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cur->Length = cpu_to_le64(li->length);
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cur->Offset = cpu_to_le64(li->offset);
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cur->Flags = cpu_to_le32(SMB2_LOCKFLAG_UNLOCK);
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/*
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* We need to save a lock here to let us add it again to the
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* file's list if the unlock range request fails on the server.
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*/
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list_move(&li->llist, &tmp_llist);
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if (++num == max_num) {
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stored_rc = smb2_lockv(xid, tcon,
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cfile->fid.persistent_fid,
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cfile->fid.volatile_fid,
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current->tgid, num, buf);
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if (stored_rc) {
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/*
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* We failed on the unlock range request - add
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* all locks from the tmp list to the head of
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* the file's list.
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*/
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cifs_move_llist(&tmp_llist,
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&cfile->llist->locks);
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rc = stored_rc;
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} else
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/*
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* The unlock range request succeed - free the
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* tmp list.
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*/
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cifs_free_llist(&tmp_llist);
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cur = buf;
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num = 0;
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} else
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cur++;
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}
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if (num) {
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stored_rc = smb2_lockv(xid, tcon, cfile->fid.persistent_fid,
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cfile->fid.volatile_fid, current->tgid,
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num, buf);
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if (stored_rc) {
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cifs_move_llist(&tmp_llist, &cfile->llist->locks);
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rc = stored_rc;
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} else
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cifs_free_llist(&tmp_llist);
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}
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up_write(&cinode->lock_sem);
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kfree(buf);
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return rc;
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}
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static int
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smb2_push_mand_fdlocks(struct cifs_fid_locks *fdlocks, const unsigned int xid,
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struct smb2_lock_element *buf, unsigned int max_num)
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{
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int rc = 0, stored_rc;
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struct cifsFileInfo *cfile = fdlocks->cfile;
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struct cifsLockInfo *li;
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unsigned int num = 0;
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struct smb2_lock_element *cur = buf;
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struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
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list_for_each_entry(li, &fdlocks->locks, llist) {
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cur->Length = cpu_to_le64(li->length);
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cur->Offset = cpu_to_le64(li->offset);
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cur->Flags = cpu_to_le32(li->type |
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SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
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if (++num == max_num) {
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stored_rc = smb2_lockv(xid, tcon,
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cfile->fid.persistent_fid,
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cfile->fid.volatile_fid,
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current->tgid, num, buf);
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if (stored_rc)
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rc = stored_rc;
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cur = buf;
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num = 0;
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} else
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cur++;
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}
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if (num) {
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stored_rc = smb2_lockv(xid, tcon,
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cfile->fid.persistent_fid,
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cfile->fid.volatile_fid,
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current->tgid, num, buf);
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if (stored_rc)
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rc = stored_rc;
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}
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return rc;
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}
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int
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smb2_push_mandatory_locks(struct cifsFileInfo *cfile)
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{
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int rc = 0, stored_rc;
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unsigned int xid;
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unsigned int max_num, max_buf;
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struct smb2_lock_element *buf;
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struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry));
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struct cifs_fid_locks *fdlocks;
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xid = get_xid();
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/*
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* Accessing maxBuf is racy with cifs_reconnect - need to store value
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* and check it for zero before using.
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*/
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max_buf = tlink_tcon(cfile->tlink)->ses->server->maxBuf;
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if (max_buf < sizeof(struct smb2_lock_element)) {
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free_xid(xid);
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return -EINVAL;
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}
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BUILD_BUG_ON(sizeof(struct smb2_lock_element) > PAGE_SIZE);
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max_buf = min_t(unsigned int, max_buf, PAGE_SIZE);
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max_num = max_buf / sizeof(struct smb2_lock_element);
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buf = kcalloc(max_num, sizeof(struct smb2_lock_element), GFP_KERNEL);
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if (!buf) {
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free_xid(xid);
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return -ENOMEM;
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}
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list_for_each_entry(fdlocks, &cinode->llist, llist) {
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stored_rc = smb2_push_mand_fdlocks(fdlocks, xid, buf, max_num);
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if (stored_rc)
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rc = stored_rc;
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}
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kfree(buf);
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free_xid(xid);
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return rc;
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}
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