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