303 строки
8.0 KiB
C
303 строки
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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void
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smb2_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock)
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{
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oplock &= 0xFF;
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if (oplock == SMB2_OPLOCK_LEVEL_NOCHANGE)
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return;
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if (oplock == SMB2_OPLOCK_LEVEL_EXCLUSIVE) {
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cinode->clientCanCacheAll = true;
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cinode->clientCanCacheRead = true;
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cFYI(1, "Exclusive Oplock granted on inode %p",
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&cinode->vfs_inode);
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} else if (oplock == SMB2_OPLOCK_LEVEL_II) {
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cinode->clientCanCacheAll = false;
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cinode->clientCanCacheRead = true;
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cFYI(1, "Level II Oplock granted on inode %p",
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&cinode->vfs_inode);
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} else {
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cinode->clientCanCacheAll = false;
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cinode->clientCanCacheRead = false;
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}
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}
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int
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smb2_open_file(const unsigned int xid, struct cifs_tcon *tcon, const char *path,
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int disposition, int desired_access, int create_options,
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struct cifs_fid *fid, __u32 *oplock, FILE_ALL_INFO *buf,
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struct cifs_sb_info *cifs_sb)
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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[17];
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smb2_path = cifs_convert_path_to_utf16(path, 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) + MAX_NAME * 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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desired_access |= FILE_READ_ATTRIBUTES;
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*smb2_oplock = SMB2_OPLOCK_LEVEL_EXCLUSIVE;
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if (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LEASING)
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memcpy(smb2_oplock + 1, fid->lease_key, SMB2_LEASE_KEY_SIZE);
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rc = SMB2_open(xid, tcon, smb2_path, &fid->persistent_fid,
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&fid->volatile_fid, desired_access, disposition,
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0, 0, smb2_oplock, smb2_data);
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if (rc)
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goto out;
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if (buf) {
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/* open response does not have IndexNumber field - get it */
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rc = SMB2_get_srv_num(xid, tcon, 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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/* let get_inode_info disable server inode numbers */
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smb2_data->IndexNumber = 0;
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rc = 0;
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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(cfile->dentry->d_inode);
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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 for zero before using.
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*/
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max_buf = tcon->ses->server->maxBuf;
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if (!max_buf)
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return -EINVAL;
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max_num = max_buf / sizeof(struct smb2_lock_element);
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buf = kzalloc(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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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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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(cfile->dentry->d_inode);
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struct cifs_fid_locks *fdlocks;
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xid = get_xid();
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/* we are going to update can_cache_brlcks here - need a write access */
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down_write(&cinode->lock_sem);
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if (!cinode->can_cache_brlcks) {
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up_write(&cinode->lock_sem);
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free_xid(xid);
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return rc;
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}
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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) {
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up_write(&cinode->lock_sem);
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free_xid(xid);
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return -EINVAL;
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}
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max_num = max_buf / sizeof(struct smb2_lock_element);
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buf = kzalloc(max_num * sizeof(struct smb2_lock_element), GFP_KERNEL);
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if (!buf) {
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up_write(&cinode->lock_sem);
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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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cinode->can_cache_brlcks = false;
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kfree(buf);
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up_write(&cinode->lock_sem);
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free_xid(xid);
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return rc;
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}
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