1304 строки
34 KiB
C
1304 строки
34 KiB
C
// SPDX-License-Identifier: LGPL-2.1
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/*
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*
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* Copyright (C) International Business Machines Corp., 2002,2008
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* Author(s): Steve French (sfrench@us.ibm.com)
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*
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*/
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#include <linux/slab.h>
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#include <linux/ctype.h>
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#include <linux/mempool.h>
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#include <linux/vmalloc.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 "smberr.h"
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#include "nterr.h"
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#include "cifs_unicode.h"
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#include "smb2pdu.h"
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#include "cifsfs.h"
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#ifdef CONFIG_CIFS_DFS_UPCALL
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#include "dns_resolve.h"
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#endif
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#include "fs_context.h"
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#include "cached_dir.h"
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extern mempool_t *cifs_sm_req_poolp;
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extern mempool_t *cifs_req_poolp;
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/* The xid serves as a useful identifier for each incoming vfs request,
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in a similar way to the mid which is useful to track each sent smb,
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and CurrentXid can also provide a running counter (although it
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will eventually wrap past zero) of the total vfs operations handled
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since the cifs fs was mounted */
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unsigned int
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_get_xid(void)
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{
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unsigned int xid;
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spin_lock(&GlobalMid_Lock);
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GlobalTotalActiveXid++;
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/* keep high water mark for number of simultaneous ops in filesystem */
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if (GlobalTotalActiveXid > GlobalMaxActiveXid)
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GlobalMaxActiveXid = GlobalTotalActiveXid;
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if (GlobalTotalActiveXid > 65000)
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cifs_dbg(FYI, "warning: more than 65000 requests active\n");
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xid = GlobalCurrentXid++;
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spin_unlock(&GlobalMid_Lock);
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return xid;
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}
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void
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_free_xid(unsigned int xid)
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{
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spin_lock(&GlobalMid_Lock);
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/* if (GlobalTotalActiveXid == 0)
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BUG(); */
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GlobalTotalActiveXid--;
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spin_unlock(&GlobalMid_Lock);
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}
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struct cifs_ses *
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sesInfoAlloc(void)
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{
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struct cifs_ses *ret_buf;
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ret_buf = kzalloc(sizeof(struct cifs_ses), GFP_KERNEL);
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if (ret_buf) {
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atomic_inc(&sesInfoAllocCount);
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spin_lock_init(&ret_buf->ses_lock);
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ret_buf->ses_status = SES_NEW;
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++ret_buf->ses_count;
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INIT_LIST_HEAD(&ret_buf->smb_ses_list);
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INIT_LIST_HEAD(&ret_buf->tcon_list);
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mutex_init(&ret_buf->session_mutex);
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spin_lock_init(&ret_buf->iface_lock);
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INIT_LIST_HEAD(&ret_buf->iface_list);
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spin_lock_init(&ret_buf->chan_lock);
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}
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return ret_buf;
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}
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void
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sesInfoFree(struct cifs_ses *buf_to_free)
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{
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struct cifs_server_iface *iface = NULL, *niface = NULL;
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if (buf_to_free == NULL) {
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cifs_dbg(FYI, "Null buffer passed to sesInfoFree\n");
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return;
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}
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atomic_dec(&sesInfoAllocCount);
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kfree(buf_to_free->serverOS);
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kfree(buf_to_free->serverDomain);
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kfree(buf_to_free->serverNOS);
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kfree_sensitive(buf_to_free->password);
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kfree(buf_to_free->user_name);
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kfree(buf_to_free->domainName);
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kfree_sensitive(buf_to_free->auth_key.response);
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spin_lock(&buf_to_free->iface_lock);
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list_for_each_entry_safe(iface, niface, &buf_to_free->iface_list,
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iface_head)
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kref_put(&iface->refcount, release_iface);
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spin_unlock(&buf_to_free->iface_lock);
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kfree_sensitive(buf_to_free);
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}
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struct cifs_tcon *
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tconInfoAlloc(void)
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{
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struct cifs_tcon *ret_buf;
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ret_buf = kzalloc(sizeof(*ret_buf), GFP_KERNEL);
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if (!ret_buf)
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return NULL;
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ret_buf->cfids = init_cached_dirs();
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if (!ret_buf->cfids) {
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kfree(ret_buf);
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return NULL;
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}
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atomic_inc(&tconInfoAllocCount);
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ret_buf->status = TID_NEW;
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++ret_buf->tc_count;
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spin_lock_init(&ret_buf->tc_lock);
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INIT_LIST_HEAD(&ret_buf->openFileList);
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INIT_LIST_HEAD(&ret_buf->tcon_list);
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spin_lock_init(&ret_buf->open_file_lock);
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spin_lock_init(&ret_buf->stat_lock);
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atomic_set(&ret_buf->num_local_opens, 0);
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atomic_set(&ret_buf->num_remote_opens, 0);
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return ret_buf;
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}
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void
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tconInfoFree(struct cifs_tcon *tcon)
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{
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if (tcon == NULL) {
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cifs_dbg(FYI, "Null buffer passed to tconInfoFree\n");
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return;
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}
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free_cached_dirs(tcon->cfids);
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atomic_dec(&tconInfoAllocCount);
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kfree(tcon->nativeFileSystem);
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kfree_sensitive(tcon->password);
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kfree(tcon);
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}
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struct smb_hdr *
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cifs_buf_get(void)
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{
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struct smb_hdr *ret_buf = NULL;
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/*
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* SMB2 header is bigger than CIFS one - no problems to clean some
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* more bytes for CIFS.
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*/
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size_t buf_size = sizeof(struct smb2_hdr);
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/*
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* We could use negotiated size instead of max_msgsize -
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* but it may be more efficient to always alloc same size
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* albeit slightly larger than necessary and maxbuffersize
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* defaults to this and can not be bigger.
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*/
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ret_buf = mempool_alloc(cifs_req_poolp, GFP_NOFS);
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/* clear the first few header bytes */
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/* for most paths, more is cleared in header_assemble */
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memset(ret_buf, 0, buf_size + 3);
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atomic_inc(&buf_alloc_count);
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#ifdef CONFIG_CIFS_STATS2
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atomic_inc(&total_buf_alloc_count);
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#endif /* CONFIG_CIFS_STATS2 */
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return ret_buf;
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}
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void
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cifs_buf_release(void *buf_to_free)
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{
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if (buf_to_free == NULL) {
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/* cifs_dbg(FYI, "Null buffer passed to cifs_buf_release\n");*/
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return;
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}
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mempool_free(buf_to_free, cifs_req_poolp);
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atomic_dec(&buf_alloc_count);
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return;
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}
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struct smb_hdr *
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cifs_small_buf_get(void)
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{
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struct smb_hdr *ret_buf = NULL;
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/* We could use negotiated size instead of max_msgsize -
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but it may be more efficient to always alloc same size
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albeit slightly larger than necessary and maxbuffersize
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defaults to this and can not be bigger */
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ret_buf = mempool_alloc(cifs_sm_req_poolp, GFP_NOFS);
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/* No need to clear memory here, cleared in header assemble */
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/* memset(ret_buf, 0, sizeof(struct smb_hdr) + 27);*/
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atomic_inc(&small_buf_alloc_count);
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#ifdef CONFIG_CIFS_STATS2
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atomic_inc(&total_small_buf_alloc_count);
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#endif /* CONFIG_CIFS_STATS2 */
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return ret_buf;
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}
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void
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cifs_small_buf_release(void *buf_to_free)
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{
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if (buf_to_free == NULL) {
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cifs_dbg(FYI, "Null buffer passed to cifs_small_buf_release\n");
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return;
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}
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mempool_free(buf_to_free, cifs_sm_req_poolp);
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atomic_dec(&small_buf_alloc_count);
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return;
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}
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void
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free_rsp_buf(int resp_buftype, void *rsp)
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{
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if (resp_buftype == CIFS_SMALL_BUFFER)
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cifs_small_buf_release(rsp);
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else if (resp_buftype == CIFS_LARGE_BUFFER)
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cifs_buf_release(rsp);
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}
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/* NB: MID can not be set if treeCon not passed in, in that
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case it is responsbility of caller to set the mid */
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void
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header_assemble(struct smb_hdr *buffer, char smb_command /* command */ ,
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const struct cifs_tcon *treeCon, int word_count
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/* length of fixed section (word count) in two byte units */)
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{
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char *temp = (char *) buffer;
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memset(temp, 0, 256); /* bigger than MAX_CIFS_HDR_SIZE */
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buffer->smb_buf_length = cpu_to_be32(
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(2 * word_count) + sizeof(struct smb_hdr) -
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4 /* RFC 1001 length field does not count */ +
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2 /* for bcc field itself */) ;
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buffer->Protocol[0] = 0xFF;
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buffer->Protocol[1] = 'S';
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buffer->Protocol[2] = 'M';
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buffer->Protocol[3] = 'B';
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buffer->Command = smb_command;
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buffer->Flags = 0x00; /* case sensitive */
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buffer->Flags2 = SMBFLG2_KNOWS_LONG_NAMES;
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buffer->Pid = cpu_to_le16((__u16)current->tgid);
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buffer->PidHigh = cpu_to_le16((__u16)(current->tgid >> 16));
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if (treeCon) {
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buffer->Tid = treeCon->tid;
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if (treeCon->ses) {
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if (treeCon->ses->capabilities & CAP_UNICODE)
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buffer->Flags2 |= SMBFLG2_UNICODE;
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if (treeCon->ses->capabilities & CAP_STATUS32)
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buffer->Flags2 |= SMBFLG2_ERR_STATUS;
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/* Uid is not converted */
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buffer->Uid = treeCon->ses->Suid;
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if (treeCon->ses->server)
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buffer->Mid = get_next_mid(treeCon->ses->server);
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}
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if (treeCon->Flags & SMB_SHARE_IS_IN_DFS)
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buffer->Flags2 |= SMBFLG2_DFS;
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if (treeCon->nocase)
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buffer->Flags |= SMBFLG_CASELESS;
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if ((treeCon->ses) && (treeCon->ses->server))
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if (treeCon->ses->server->sign)
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buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
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}
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/* endian conversion of flags is now done just before sending */
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buffer->WordCount = (char) word_count;
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return;
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}
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static int
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check_smb_hdr(struct smb_hdr *smb)
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{
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/* does it have the right SMB "signature" ? */
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if (*(__le32 *) smb->Protocol != cpu_to_le32(0x424d53ff)) {
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cifs_dbg(VFS, "Bad protocol string signature header 0x%x\n",
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*(unsigned int *)smb->Protocol);
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return 1;
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}
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/* if it's a response then accept */
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if (smb->Flags & SMBFLG_RESPONSE)
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return 0;
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/* only one valid case where server sends us request */
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if (smb->Command == SMB_COM_LOCKING_ANDX)
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return 0;
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cifs_dbg(VFS, "Server sent request, not response. mid=%u\n",
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get_mid(smb));
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return 1;
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}
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int
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checkSMB(char *buf, unsigned int total_read, struct TCP_Server_Info *server)
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{
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struct smb_hdr *smb = (struct smb_hdr *)buf;
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__u32 rfclen = be32_to_cpu(smb->smb_buf_length);
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__u32 clc_len; /* calculated length */
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cifs_dbg(FYI, "checkSMB Length: 0x%x, smb_buf_length: 0x%x\n",
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total_read, rfclen);
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/* is this frame too small to even get to a BCC? */
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if (total_read < 2 + sizeof(struct smb_hdr)) {
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if ((total_read >= sizeof(struct smb_hdr) - 1)
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&& (smb->Status.CifsError != 0)) {
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/* it's an error return */
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smb->WordCount = 0;
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/* some error cases do not return wct and bcc */
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return 0;
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} else if ((total_read == sizeof(struct smb_hdr) + 1) &&
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(smb->WordCount == 0)) {
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char *tmp = (char *)smb;
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/* Need to work around a bug in two servers here */
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/* First, check if the part of bcc they sent was zero */
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if (tmp[sizeof(struct smb_hdr)] == 0) {
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/* some servers return only half of bcc
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* on simple responses (wct, bcc both zero)
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* in particular have seen this on
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* ulogoffX and FindClose. This leaves
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* one byte of bcc potentially unitialized
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*/
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/* zero rest of bcc */
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tmp[sizeof(struct smb_hdr)+1] = 0;
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return 0;
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}
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cifs_dbg(VFS, "rcvd invalid byte count (bcc)\n");
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} else {
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cifs_dbg(VFS, "Length less than smb header size\n");
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}
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return -EIO;
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}
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/* otherwise, there is enough to get to the BCC */
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if (check_smb_hdr(smb))
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return -EIO;
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clc_len = smbCalcSize(smb);
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if (4 + rfclen != total_read) {
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cifs_dbg(VFS, "Length read does not match RFC1001 length %d\n",
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rfclen);
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return -EIO;
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}
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if (4 + rfclen != clc_len) {
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__u16 mid = get_mid(smb);
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/* check if bcc wrapped around for large read responses */
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if ((rfclen > 64 * 1024) && (rfclen > clc_len)) {
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/* check if lengths match mod 64K */
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if (((4 + rfclen) & 0xFFFF) == (clc_len & 0xFFFF))
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return 0; /* bcc wrapped */
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}
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cifs_dbg(FYI, "Calculated size %u vs length %u mismatch for mid=%u\n",
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clc_len, 4 + rfclen, mid);
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if (4 + rfclen < clc_len) {
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cifs_dbg(VFS, "RFC1001 size %u smaller than SMB for mid=%u\n",
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rfclen, mid);
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return -EIO;
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} else if (rfclen > clc_len + 512) {
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/*
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* Some servers (Windows XP in particular) send more
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* data than the lengths in the SMB packet would
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* indicate on certain calls (byte range locks and
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* trans2 find first calls in particular). While the
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* client can handle such a frame by ignoring the
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* trailing data, we choose limit the amount of extra
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* data to 512 bytes.
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*/
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cifs_dbg(VFS, "RFC1001 size %u more than 512 bytes larger than SMB for mid=%u\n",
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rfclen, mid);
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return -EIO;
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}
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}
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return 0;
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}
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bool
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is_valid_oplock_break(char *buffer, struct TCP_Server_Info *srv)
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{
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struct smb_hdr *buf = (struct smb_hdr *)buffer;
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struct smb_com_lock_req *pSMB = (struct smb_com_lock_req *)buf;
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struct TCP_Server_Info *pserver;
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struct cifs_ses *ses;
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struct cifs_tcon *tcon;
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struct cifsInodeInfo *pCifsInode;
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struct cifsFileInfo *netfile;
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cifs_dbg(FYI, "Checking for oplock break or dnotify response\n");
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if ((pSMB->hdr.Command == SMB_COM_NT_TRANSACT) &&
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(pSMB->hdr.Flags & SMBFLG_RESPONSE)) {
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struct smb_com_transaction_change_notify_rsp *pSMBr =
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(struct smb_com_transaction_change_notify_rsp *)buf;
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struct file_notify_information *pnotify;
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__u32 data_offset = 0;
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size_t len = srv->total_read - sizeof(pSMBr->hdr.smb_buf_length);
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if (get_bcc(buf) > sizeof(struct file_notify_information)) {
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data_offset = le32_to_cpu(pSMBr->DataOffset);
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if (data_offset >
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len - sizeof(struct file_notify_information)) {
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cifs_dbg(FYI, "Invalid data_offset %u\n",
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data_offset);
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return true;
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}
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pnotify = (struct file_notify_information *)
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((char *)&pSMBr->hdr.Protocol + data_offset);
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cifs_dbg(FYI, "dnotify on %s Action: 0x%x\n",
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pnotify->FileName, pnotify->Action);
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/* cifs_dump_mem("Rcvd notify Data: ",buf,
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sizeof(struct smb_hdr)+60); */
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return true;
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}
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if (pSMBr->hdr.Status.CifsError) {
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cifs_dbg(FYI, "notify err 0x%x\n",
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pSMBr->hdr.Status.CifsError);
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return true;
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}
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return false;
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}
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if (pSMB->hdr.Command != SMB_COM_LOCKING_ANDX)
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return false;
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if (pSMB->hdr.Flags & SMBFLG_RESPONSE) {
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/* no sense logging error on invalid handle on oplock
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break - harmless race between close request and oplock
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break response is expected from time to time writing out
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large dirty files cached on the client */
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if ((NT_STATUS_INVALID_HANDLE) ==
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le32_to_cpu(pSMB->hdr.Status.CifsError)) {
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cifs_dbg(FYI, "Invalid handle on oplock break\n");
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return true;
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} else if (ERRbadfid ==
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le16_to_cpu(pSMB->hdr.Status.DosError.Error)) {
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return true;
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} else {
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return false; /* on valid oplock brk we get "request" */
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}
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}
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if (pSMB->hdr.WordCount != 8)
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return false;
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cifs_dbg(FYI, "oplock type 0x%x level 0x%x\n",
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pSMB->LockType, pSMB->OplockLevel);
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if (!(pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE))
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return false;
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/* If server is a channel, select the primary channel */
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pserver = CIFS_SERVER_IS_CHAN(srv) ? srv->primary_server : srv;
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/* look up tcon based on tid & uid */
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spin_lock(&cifs_tcp_ses_lock);
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list_for_each_entry(ses, &pserver->smb_ses_list, smb_ses_list) {
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list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
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if (tcon->tid != buf->Tid)
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continue;
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|
cifs_stats_inc(&tcon->stats.cifs_stats.num_oplock_brks);
|
|
spin_lock(&tcon->open_file_lock);
|
|
list_for_each_entry(netfile, &tcon->openFileList, tlist) {
|
|
if (pSMB->Fid != netfile->fid.netfid)
|
|
continue;
|
|
|
|
cifs_dbg(FYI, "file id match, oplock break\n");
|
|
pCifsInode = CIFS_I(d_inode(netfile->dentry));
|
|
|
|
set_bit(CIFS_INODE_PENDING_OPLOCK_BREAK,
|
|
&pCifsInode->flags);
|
|
|
|
netfile->oplock_epoch = 0;
|
|
netfile->oplock_level = pSMB->OplockLevel;
|
|
netfile->oplock_break_cancelled = false;
|
|
cifs_queue_oplock_break(netfile);
|
|
|
|
spin_unlock(&tcon->open_file_lock);
|
|
spin_unlock(&cifs_tcp_ses_lock);
|
|
return true;
|
|
}
|
|
spin_unlock(&tcon->open_file_lock);
|
|
spin_unlock(&cifs_tcp_ses_lock);
|
|
cifs_dbg(FYI, "No matching file for oplock break\n");
|
|
return true;
|
|
}
|
|
}
|
|
spin_unlock(&cifs_tcp_ses_lock);
|
|
cifs_dbg(FYI, "Can not process oplock break for non-existent connection\n");
|
|
return true;
|
|
}
|
|
|
|
void
|
|
dump_smb(void *buf, int smb_buf_length)
|
|
{
|
|
if (traceSMB == 0)
|
|
return;
|
|
|
|
print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_NONE, 8, 2, buf,
|
|
smb_buf_length, true);
|
|
}
|
|
|
|
void
|
|
cifs_autodisable_serverino(struct cifs_sb_info *cifs_sb)
|
|
{
|
|
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
|
|
struct cifs_tcon *tcon = NULL;
|
|
|
|
if (cifs_sb->master_tlink)
|
|
tcon = cifs_sb_master_tcon(cifs_sb);
|
|
|
|
cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
|
|
cifs_sb->mnt_cifs_serverino_autodisabled = true;
|
|
cifs_dbg(VFS, "Autodisabling the use of server inode numbers on %s\n",
|
|
tcon ? tcon->tree_name : "new server");
|
|
cifs_dbg(VFS, "The server doesn't seem to support them properly or the files might be on different servers (DFS)\n");
|
|
cifs_dbg(VFS, "Hardlinks will not be recognized on this mount. Consider mounting with the \"noserverino\" option to silence this message.\n");
|
|
|
|
}
|
|
}
|
|
|
|
void cifs_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock)
|
|
{
|
|
oplock &= 0xF;
|
|
|
|
if (oplock == OPLOCK_EXCLUSIVE) {
|
|
cinode->oplock = CIFS_CACHE_WRITE_FLG | CIFS_CACHE_READ_FLG;
|
|
cifs_dbg(FYI, "Exclusive Oplock granted on inode %p\n",
|
|
&cinode->netfs.inode);
|
|
} else if (oplock == OPLOCK_READ) {
|
|
cinode->oplock = CIFS_CACHE_READ_FLG;
|
|
cifs_dbg(FYI, "Level II Oplock granted on inode %p\n",
|
|
&cinode->netfs.inode);
|
|
} else
|
|
cinode->oplock = 0;
|
|
}
|
|
|
|
/*
|
|
* We wait for oplock breaks to be processed before we attempt to perform
|
|
* writes.
|
|
*/
|
|
int cifs_get_writer(struct cifsInodeInfo *cinode)
|
|
{
|
|
int rc;
|
|
|
|
start:
|
|
rc = wait_on_bit(&cinode->flags, CIFS_INODE_PENDING_OPLOCK_BREAK,
|
|
TASK_KILLABLE);
|
|
if (rc)
|
|
return rc;
|
|
|
|
spin_lock(&cinode->writers_lock);
|
|
if (!cinode->writers)
|
|
set_bit(CIFS_INODE_PENDING_WRITERS, &cinode->flags);
|
|
cinode->writers++;
|
|
/* Check to see if we have started servicing an oplock break */
|
|
if (test_bit(CIFS_INODE_PENDING_OPLOCK_BREAK, &cinode->flags)) {
|
|
cinode->writers--;
|
|
if (cinode->writers == 0) {
|
|
clear_bit(CIFS_INODE_PENDING_WRITERS, &cinode->flags);
|
|
wake_up_bit(&cinode->flags, CIFS_INODE_PENDING_WRITERS);
|
|
}
|
|
spin_unlock(&cinode->writers_lock);
|
|
goto start;
|
|
}
|
|
spin_unlock(&cinode->writers_lock);
|
|
return 0;
|
|
}
|
|
|
|
void cifs_put_writer(struct cifsInodeInfo *cinode)
|
|
{
|
|
spin_lock(&cinode->writers_lock);
|
|
cinode->writers--;
|
|
if (cinode->writers == 0) {
|
|
clear_bit(CIFS_INODE_PENDING_WRITERS, &cinode->flags);
|
|
wake_up_bit(&cinode->flags, CIFS_INODE_PENDING_WRITERS);
|
|
}
|
|
spin_unlock(&cinode->writers_lock);
|
|
}
|
|
|
|
/**
|
|
* cifs_queue_oplock_break - queue the oplock break handler for cfile
|
|
* @cfile: The file to break the oplock on
|
|
*
|
|
* This function is called from the demultiplex thread when it
|
|
* receives an oplock break for @cfile.
|
|
*
|
|
* Assumes the tcon->open_file_lock is held.
|
|
* Assumes cfile->file_info_lock is NOT held.
|
|
*/
|
|
void cifs_queue_oplock_break(struct cifsFileInfo *cfile)
|
|
{
|
|
/*
|
|
* Bump the handle refcount now while we hold the
|
|
* open_file_lock to enforce the validity of it for the oplock
|
|
* break handler. The matching put is done at the end of the
|
|
* handler.
|
|
*/
|
|
cifsFileInfo_get(cfile);
|
|
|
|
queue_work(cifsoplockd_wq, &cfile->oplock_break);
|
|
}
|
|
|
|
void cifs_done_oplock_break(struct cifsInodeInfo *cinode)
|
|
{
|
|
clear_bit(CIFS_INODE_PENDING_OPLOCK_BREAK, &cinode->flags);
|
|
wake_up_bit(&cinode->flags, CIFS_INODE_PENDING_OPLOCK_BREAK);
|
|
}
|
|
|
|
bool
|
|
backup_cred(struct cifs_sb_info *cifs_sb)
|
|
{
|
|
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID) {
|
|
if (uid_eq(cifs_sb->ctx->backupuid, current_fsuid()))
|
|
return true;
|
|
}
|
|
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID) {
|
|
if (in_group_p(cifs_sb->ctx->backupgid))
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
void
|
|
cifs_del_pending_open(struct cifs_pending_open *open)
|
|
{
|
|
spin_lock(&tlink_tcon(open->tlink)->open_file_lock);
|
|
list_del(&open->olist);
|
|
spin_unlock(&tlink_tcon(open->tlink)->open_file_lock);
|
|
}
|
|
|
|
void
|
|
cifs_add_pending_open_locked(struct cifs_fid *fid, struct tcon_link *tlink,
|
|
struct cifs_pending_open *open)
|
|
{
|
|
memcpy(open->lease_key, fid->lease_key, SMB2_LEASE_KEY_SIZE);
|
|
open->oplock = CIFS_OPLOCK_NO_CHANGE;
|
|
open->tlink = tlink;
|
|
fid->pending_open = open;
|
|
list_add_tail(&open->olist, &tlink_tcon(tlink)->pending_opens);
|
|
}
|
|
|
|
void
|
|
cifs_add_pending_open(struct cifs_fid *fid, struct tcon_link *tlink,
|
|
struct cifs_pending_open *open)
|
|
{
|
|
spin_lock(&tlink_tcon(tlink)->open_file_lock);
|
|
cifs_add_pending_open_locked(fid, tlink, open);
|
|
spin_unlock(&tlink_tcon(open->tlink)->open_file_lock);
|
|
}
|
|
|
|
/*
|
|
* Critical section which runs after acquiring deferred_lock.
|
|
* As there is no reference count on cifs_deferred_close, pdclose
|
|
* should not be used outside deferred_lock.
|
|
*/
|
|
bool
|
|
cifs_is_deferred_close(struct cifsFileInfo *cfile, struct cifs_deferred_close **pdclose)
|
|
{
|
|
struct cifs_deferred_close *dclose;
|
|
|
|
list_for_each_entry(dclose, &CIFS_I(d_inode(cfile->dentry))->deferred_closes, dlist) {
|
|
if ((dclose->netfid == cfile->fid.netfid) &&
|
|
(dclose->persistent_fid == cfile->fid.persistent_fid) &&
|
|
(dclose->volatile_fid == cfile->fid.volatile_fid)) {
|
|
*pdclose = dclose;
|
|
return true;
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/*
|
|
* Critical section which runs after acquiring deferred_lock.
|
|
*/
|
|
void
|
|
cifs_add_deferred_close(struct cifsFileInfo *cfile, struct cifs_deferred_close *dclose)
|
|
{
|
|
bool is_deferred = false;
|
|
struct cifs_deferred_close *pdclose;
|
|
|
|
is_deferred = cifs_is_deferred_close(cfile, &pdclose);
|
|
if (is_deferred) {
|
|
kfree(dclose);
|
|
return;
|
|
}
|
|
|
|
dclose->tlink = cfile->tlink;
|
|
dclose->netfid = cfile->fid.netfid;
|
|
dclose->persistent_fid = cfile->fid.persistent_fid;
|
|
dclose->volatile_fid = cfile->fid.volatile_fid;
|
|
list_add_tail(&dclose->dlist, &CIFS_I(d_inode(cfile->dentry))->deferred_closes);
|
|
}
|
|
|
|
/*
|
|
* Critical section which runs after acquiring deferred_lock.
|
|
*/
|
|
void
|
|
cifs_del_deferred_close(struct cifsFileInfo *cfile)
|
|
{
|
|
bool is_deferred = false;
|
|
struct cifs_deferred_close *dclose;
|
|
|
|
is_deferred = cifs_is_deferred_close(cfile, &dclose);
|
|
if (!is_deferred)
|
|
return;
|
|
list_del(&dclose->dlist);
|
|
kfree(dclose);
|
|
}
|
|
|
|
void
|
|
cifs_close_deferred_file(struct cifsInodeInfo *cifs_inode)
|
|
{
|
|
struct cifsFileInfo *cfile = NULL;
|
|
struct file_list *tmp_list, *tmp_next_list;
|
|
struct list_head file_head;
|
|
|
|
if (cifs_inode == NULL)
|
|
return;
|
|
|
|
INIT_LIST_HEAD(&file_head);
|
|
spin_lock(&cifs_inode->open_file_lock);
|
|
list_for_each_entry(cfile, &cifs_inode->openFileList, flist) {
|
|
if (delayed_work_pending(&cfile->deferred)) {
|
|
if (cancel_delayed_work(&cfile->deferred)) {
|
|
cifs_del_deferred_close(cfile);
|
|
|
|
tmp_list = kmalloc(sizeof(struct file_list), GFP_ATOMIC);
|
|
if (tmp_list == NULL)
|
|
break;
|
|
tmp_list->cfile = cfile;
|
|
list_add_tail(&tmp_list->list, &file_head);
|
|
}
|
|
}
|
|
}
|
|
spin_unlock(&cifs_inode->open_file_lock);
|
|
|
|
list_for_each_entry_safe(tmp_list, tmp_next_list, &file_head, list) {
|
|
_cifsFileInfo_put(tmp_list->cfile, true, false);
|
|
list_del(&tmp_list->list);
|
|
kfree(tmp_list);
|
|
}
|
|
}
|
|
|
|
void
|
|
cifs_close_all_deferred_files(struct cifs_tcon *tcon)
|
|
{
|
|
struct cifsFileInfo *cfile;
|
|
struct file_list *tmp_list, *tmp_next_list;
|
|
struct list_head file_head;
|
|
|
|
INIT_LIST_HEAD(&file_head);
|
|
spin_lock(&tcon->open_file_lock);
|
|
list_for_each_entry(cfile, &tcon->openFileList, tlist) {
|
|
if (delayed_work_pending(&cfile->deferred)) {
|
|
if (cancel_delayed_work(&cfile->deferred)) {
|
|
cifs_del_deferred_close(cfile);
|
|
|
|
tmp_list = kmalloc(sizeof(struct file_list), GFP_ATOMIC);
|
|
if (tmp_list == NULL)
|
|
break;
|
|
tmp_list->cfile = cfile;
|
|
list_add_tail(&tmp_list->list, &file_head);
|
|
}
|
|
}
|
|
}
|
|
spin_unlock(&tcon->open_file_lock);
|
|
|
|
list_for_each_entry_safe(tmp_list, tmp_next_list, &file_head, list) {
|
|
_cifsFileInfo_put(tmp_list->cfile, true, false);
|
|
list_del(&tmp_list->list);
|
|
kfree(tmp_list);
|
|
}
|
|
}
|
|
void
|
|
cifs_close_deferred_file_under_dentry(struct cifs_tcon *tcon, const char *path)
|
|
{
|
|
struct cifsFileInfo *cfile;
|
|
struct file_list *tmp_list, *tmp_next_list;
|
|
struct list_head file_head;
|
|
void *page;
|
|
const char *full_path;
|
|
|
|
INIT_LIST_HEAD(&file_head);
|
|
page = alloc_dentry_path();
|
|
spin_lock(&tcon->open_file_lock);
|
|
list_for_each_entry(cfile, &tcon->openFileList, tlist) {
|
|
full_path = build_path_from_dentry(cfile->dentry, page);
|
|
if (strstr(full_path, path)) {
|
|
if (delayed_work_pending(&cfile->deferred)) {
|
|
if (cancel_delayed_work(&cfile->deferred)) {
|
|
cifs_del_deferred_close(cfile);
|
|
|
|
tmp_list = kmalloc(sizeof(struct file_list), GFP_ATOMIC);
|
|
if (tmp_list == NULL)
|
|
break;
|
|
tmp_list->cfile = cfile;
|
|
list_add_tail(&tmp_list->list, &file_head);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
spin_unlock(&tcon->open_file_lock);
|
|
|
|
list_for_each_entry_safe(tmp_list, tmp_next_list, &file_head, list) {
|
|
_cifsFileInfo_put(tmp_list->cfile, true, false);
|
|
list_del(&tmp_list->list);
|
|
kfree(tmp_list);
|
|
}
|
|
free_dentry_path(page);
|
|
}
|
|
|
|
/* parses DFS referral V3 structure
|
|
* caller is responsible for freeing target_nodes
|
|
* returns:
|
|
* - on success - 0
|
|
* - on failure - errno
|
|
*/
|
|
int
|
|
parse_dfs_referrals(struct get_dfs_referral_rsp *rsp, u32 rsp_size,
|
|
unsigned int *num_of_nodes,
|
|
struct dfs_info3_param **target_nodes,
|
|
const struct nls_table *nls_codepage, int remap,
|
|
const char *searchName, bool is_unicode)
|
|
{
|
|
int i, rc = 0;
|
|
char *data_end;
|
|
struct dfs_referral_level_3 *ref;
|
|
|
|
*num_of_nodes = le16_to_cpu(rsp->NumberOfReferrals);
|
|
|
|
if (*num_of_nodes < 1) {
|
|
cifs_dbg(VFS, "num_referrals: must be at least > 0, but we get num_referrals = %d\n",
|
|
*num_of_nodes);
|
|
rc = -EINVAL;
|
|
goto parse_DFS_referrals_exit;
|
|
}
|
|
|
|
ref = (struct dfs_referral_level_3 *) &(rsp->referrals);
|
|
if (ref->VersionNumber != cpu_to_le16(3)) {
|
|
cifs_dbg(VFS, "Referrals of V%d version are not supported, should be V3\n",
|
|
le16_to_cpu(ref->VersionNumber));
|
|
rc = -EINVAL;
|
|
goto parse_DFS_referrals_exit;
|
|
}
|
|
|
|
/* get the upper boundary of the resp buffer */
|
|
data_end = (char *)rsp + rsp_size;
|
|
|
|
cifs_dbg(FYI, "num_referrals: %d dfs flags: 0x%x ...\n",
|
|
*num_of_nodes, le32_to_cpu(rsp->DFSFlags));
|
|
|
|
*target_nodes = kcalloc(*num_of_nodes, sizeof(struct dfs_info3_param),
|
|
GFP_KERNEL);
|
|
if (*target_nodes == NULL) {
|
|
rc = -ENOMEM;
|
|
goto parse_DFS_referrals_exit;
|
|
}
|
|
|
|
/* collect necessary data from referrals */
|
|
for (i = 0; i < *num_of_nodes; i++) {
|
|
char *temp;
|
|
int max_len;
|
|
struct dfs_info3_param *node = (*target_nodes)+i;
|
|
|
|
node->flags = le32_to_cpu(rsp->DFSFlags);
|
|
if (is_unicode) {
|
|
__le16 *tmp = kmalloc(strlen(searchName)*2 + 2,
|
|
GFP_KERNEL);
|
|
if (tmp == NULL) {
|
|
rc = -ENOMEM;
|
|
goto parse_DFS_referrals_exit;
|
|
}
|
|
cifsConvertToUTF16((__le16 *) tmp, searchName,
|
|
PATH_MAX, nls_codepage, remap);
|
|
node->path_consumed = cifs_utf16_bytes(tmp,
|
|
le16_to_cpu(rsp->PathConsumed),
|
|
nls_codepage);
|
|
kfree(tmp);
|
|
} else
|
|
node->path_consumed = le16_to_cpu(rsp->PathConsumed);
|
|
|
|
node->server_type = le16_to_cpu(ref->ServerType);
|
|
node->ref_flag = le16_to_cpu(ref->ReferralEntryFlags);
|
|
|
|
/* copy DfsPath */
|
|
temp = (char *)ref + le16_to_cpu(ref->DfsPathOffset);
|
|
max_len = data_end - temp;
|
|
node->path_name = cifs_strndup_from_utf16(temp, max_len,
|
|
is_unicode, nls_codepage);
|
|
if (!node->path_name) {
|
|
rc = -ENOMEM;
|
|
goto parse_DFS_referrals_exit;
|
|
}
|
|
|
|
/* copy link target UNC */
|
|
temp = (char *)ref + le16_to_cpu(ref->NetworkAddressOffset);
|
|
max_len = data_end - temp;
|
|
node->node_name = cifs_strndup_from_utf16(temp, max_len,
|
|
is_unicode, nls_codepage);
|
|
if (!node->node_name) {
|
|
rc = -ENOMEM;
|
|
goto parse_DFS_referrals_exit;
|
|
}
|
|
|
|
node->ttl = le32_to_cpu(ref->TimeToLive);
|
|
|
|
ref++;
|
|
}
|
|
|
|
parse_DFS_referrals_exit:
|
|
if (rc) {
|
|
free_dfs_info_array(*target_nodes, *num_of_nodes);
|
|
*target_nodes = NULL;
|
|
*num_of_nodes = 0;
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
struct cifs_aio_ctx *
|
|
cifs_aio_ctx_alloc(void)
|
|
{
|
|
struct cifs_aio_ctx *ctx;
|
|
|
|
/*
|
|
* Must use kzalloc to initialize ctx->bv to NULL and ctx->direct_io
|
|
* to false so that we know when we have to unreference pages within
|
|
* cifs_aio_ctx_release()
|
|
*/
|
|
ctx = kzalloc(sizeof(struct cifs_aio_ctx), GFP_KERNEL);
|
|
if (!ctx)
|
|
return NULL;
|
|
|
|
INIT_LIST_HEAD(&ctx->list);
|
|
mutex_init(&ctx->aio_mutex);
|
|
init_completion(&ctx->done);
|
|
kref_init(&ctx->refcount);
|
|
return ctx;
|
|
}
|
|
|
|
void
|
|
cifs_aio_ctx_release(struct kref *refcount)
|
|
{
|
|
struct cifs_aio_ctx *ctx = container_of(refcount,
|
|
struct cifs_aio_ctx, refcount);
|
|
|
|
cifsFileInfo_put(ctx->cfile);
|
|
|
|
/*
|
|
* ctx->bv is only set if setup_aio_ctx_iter() was call successfuly
|
|
* which means that iov_iter_get_pages() was a success and thus that
|
|
* we have taken reference on pages.
|
|
*/
|
|
if (ctx->bv) {
|
|
unsigned i;
|
|
|
|
for (i = 0; i < ctx->npages; i++) {
|
|
if (ctx->should_dirty)
|
|
set_page_dirty(ctx->bv[i].bv_page);
|
|
put_page(ctx->bv[i].bv_page);
|
|
}
|
|
kvfree(ctx->bv);
|
|
}
|
|
|
|
kfree(ctx);
|
|
}
|
|
|
|
#define CIFS_AIO_KMALLOC_LIMIT (1024 * 1024)
|
|
|
|
int
|
|
setup_aio_ctx_iter(struct cifs_aio_ctx *ctx, struct iov_iter *iter, int rw)
|
|
{
|
|
ssize_t rc;
|
|
unsigned int cur_npages;
|
|
unsigned int npages = 0;
|
|
unsigned int i;
|
|
size_t len;
|
|
size_t count = iov_iter_count(iter);
|
|
unsigned int saved_len;
|
|
size_t start;
|
|
unsigned int max_pages = iov_iter_npages(iter, INT_MAX);
|
|
struct page **pages = NULL;
|
|
struct bio_vec *bv = NULL;
|
|
|
|
if (iov_iter_is_kvec(iter)) {
|
|
memcpy(&ctx->iter, iter, sizeof(*iter));
|
|
ctx->len = count;
|
|
iov_iter_advance(iter, count);
|
|
return 0;
|
|
}
|
|
|
|
if (array_size(max_pages, sizeof(*bv)) <= CIFS_AIO_KMALLOC_LIMIT)
|
|
bv = kmalloc_array(max_pages, sizeof(*bv), GFP_KERNEL);
|
|
|
|
if (!bv) {
|
|
bv = vmalloc(array_size(max_pages, sizeof(*bv)));
|
|
if (!bv)
|
|
return -ENOMEM;
|
|
}
|
|
|
|
if (array_size(max_pages, sizeof(*pages)) <= CIFS_AIO_KMALLOC_LIMIT)
|
|
pages = kmalloc_array(max_pages, sizeof(*pages), GFP_KERNEL);
|
|
|
|
if (!pages) {
|
|
pages = vmalloc(array_size(max_pages, sizeof(*pages)));
|
|
if (!pages) {
|
|
kvfree(bv);
|
|
return -ENOMEM;
|
|
}
|
|
}
|
|
|
|
saved_len = count;
|
|
|
|
while (count && npages < max_pages) {
|
|
rc = iov_iter_get_pages2(iter, pages, count, max_pages, &start);
|
|
if (rc < 0) {
|
|
cifs_dbg(VFS, "Couldn't get user pages (rc=%zd)\n", rc);
|
|
break;
|
|
}
|
|
|
|
if (rc > count) {
|
|
cifs_dbg(VFS, "get pages rc=%zd more than %zu\n", rc,
|
|
count);
|
|
break;
|
|
}
|
|
|
|
count -= rc;
|
|
rc += start;
|
|
cur_npages = DIV_ROUND_UP(rc, PAGE_SIZE);
|
|
|
|
if (npages + cur_npages > max_pages) {
|
|
cifs_dbg(VFS, "out of vec array capacity (%u vs %u)\n",
|
|
npages + cur_npages, max_pages);
|
|
break;
|
|
}
|
|
|
|
for (i = 0; i < cur_npages; i++) {
|
|
len = rc > PAGE_SIZE ? PAGE_SIZE : rc;
|
|
bv[npages + i].bv_page = pages[i];
|
|
bv[npages + i].bv_offset = start;
|
|
bv[npages + i].bv_len = len - start;
|
|
rc -= len;
|
|
start = 0;
|
|
}
|
|
|
|
npages += cur_npages;
|
|
}
|
|
|
|
kvfree(pages);
|
|
ctx->bv = bv;
|
|
ctx->len = saved_len - count;
|
|
ctx->npages = npages;
|
|
iov_iter_bvec(&ctx->iter, rw, ctx->bv, npages, ctx->len);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* cifs_alloc_hash - allocate hash and hash context together
|
|
* @name: The name of the crypto hash algo
|
|
* @sdesc: SHASH descriptor where to put the pointer to the hash TFM
|
|
*
|
|
* The caller has to make sure @sdesc is initialized to either NULL or
|
|
* a valid context. It can be freed via cifs_free_hash().
|
|
*/
|
|
int
|
|
cifs_alloc_hash(const char *name, struct shash_desc **sdesc)
|
|
{
|
|
int rc = 0;
|
|
struct crypto_shash *alg = NULL;
|
|
|
|
if (*sdesc)
|
|
return 0;
|
|
|
|
alg = crypto_alloc_shash(name, 0, 0);
|
|
if (IS_ERR(alg)) {
|
|
cifs_dbg(VFS, "Could not allocate shash TFM '%s'\n", name);
|
|
rc = PTR_ERR(alg);
|
|
*sdesc = NULL;
|
|
return rc;
|
|
}
|
|
|
|
*sdesc = kmalloc(sizeof(struct shash_desc) + crypto_shash_descsize(alg), GFP_KERNEL);
|
|
if (*sdesc == NULL) {
|
|
cifs_dbg(VFS, "no memory left to allocate shash TFM '%s'\n", name);
|
|
crypto_free_shash(alg);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
(*sdesc)->tfm = alg;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* cifs_free_hash - free hash and hash context together
|
|
* @sdesc: Where to find the pointer to the hash TFM
|
|
*
|
|
* Freeing a NULL descriptor is safe.
|
|
*/
|
|
void
|
|
cifs_free_hash(struct shash_desc **sdesc)
|
|
{
|
|
if (unlikely(!sdesc) || !*sdesc)
|
|
return;
|
|
|
|
if ((*sdesc)->tfm) {
|
|
crypto_free_shash((*sdesc)->tfm);
|
|
(*sdesc)->tfm = NULL;
|
|
}
|
|
|
|
kfree_sensitive(*sdesc);
|
|
*sdesc = NULL;
|
|
}
|
|
|
|
/**
|
|
* rqst_page_get_length - obtain the length and offset for a page in smb_rqst
|
|
* @rqst: The request descriptor
|
|
* @page: The index of the page to query
|
|
* @len: Where to store the length for this page:
|
|
* @offset: Where to store the offset for this page
|
|
*/
|
|
void rqst_page_get_length(const struct smb_rqst *rqst, unsigned int page,
|
|
unsigned int *len, unsigned int *offset)
|
|
{
|
|
*len = rqst->rq_pagesz;
|
|
*offset = (page == 0) ? rqst->rq_offset : 0;
|
|
|
|
if (rqst->rq_npages == 1 || page == rqst->rq_npages-1)
|
|
*len = rqst->rq_tailsz;
|
|
else if (page == 0)
|
|
*len = rqst->rq_pagesz - rqst->rq_offset;
|
|
}
|
|
|
|
void extract_unc_hostname(const char *unc, const char **h, size_t *len)
|
|
{
|
|
const char *end;
|
|
|
|
/* skip initial slashes */
|
|
while (*unc && (*unc == '\\' || *unc == '/'))
|
|
unc++;
|
|
|
|
end = unc;
|
|
|
|
while (*end && !(*end == '\\' || *end == '/'))
|
|
end++;
|
|
|
|
*h = unc;
|
|
*len = end - unc;
|
|
}
|
|
|
|
/**
|
|
* copy_path_name - copy src path to dst, possibly truncating
|
|
* @dst: The destination buffer
|
|
* @src: The source name
|
|
*
|
|
* returns number of bytes written (including trailing nul)
|
|
*/
|
|
int copy_path_name(char *dst, const char *src)
|
|
{
|
|
int name_len;
|
|
|
|
/*
|
|
* PATH_MAX includes nul, so if strlen(src) >= PATH_MAX it
|
|
* will truncate and strlen(dst) will be PATH_MAX-1
|
|
*/
|
|
name_len = strscpy(dst, src, PATH_MAX);
|
|
if (WARN_ON_ONCE(name_len < 0))
|
|
name_len = PATH_MAX-1;
|
|
|
|
/* we count the trailing nul */
|
|
name_len++;
|
|
return name_len;
|
|
}
|
|
|
|
struct super_cb_data {
|
|
void *data;
|
|
struct super_block *sb;
|
|
};
|
|
|
|
static void tcp_super_cb(struct super_block *sb, void *arg)
|
|
{
|
|
struct super_cb_data *sd = arg;
|
|
struct TCP_Server_Info *server = sd->data;
|
|
struct cifs_sb_info *cifs_sb;
|
|
struct cifs_tcon *tcon;
|
|
|
|
if (sd->sb)
|
|
return;
|
|
|
|
cifs_sb = CIFS_SB(sb);
|
|
tcon = cifs_sb_master_tcon(cifs_sb);
|
|
if (tcon->ses->server == server)
|
|
sd->sb = sb;
|
|
}
|
|
|
|
static struct super_block *__cifs_get_super(void (*f)(struct super_block *, void *),
|
|
void *data)
|
|
{
|
|
struct super_cb_data sd = {
|
|
.data = data,
|
|
.sb = NULL,
|
|
};
|
|
struct file_system_type **fs_type = (struct file_system_type *[]) {
|
|
&cifs_fs_type, &smb3_fs_type, NULL,
|
|
};
|
|
|
|
for (; *fs_type; fs_type++) {
|
|
iterate_supers_type(*fs_type, f, &sd);
|
|
if (sd.sb) {
|
|
/*
|
|
* Grab an active reference in order to prevent automounts (DFS links)
|
|
* of expiring and then freeing up our cifs superblock pointer while
|
|
* we're doing failover.
|
|
*/
|
|
cifs_sb_active(sd.sb);
|
|
return sd.sb;
|
|
}
|
|
}
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
|
|
static void __cifs_put_super(struct super_block *sb)
|
|
{
|
|
if (!IS_ERR_OR_NULL(sb))
|
|
cifs_sb_deactive(sb);
|
|
}
|
|
|
|
struct super_block *cifs_get_tcp_super(struct TCP_Server_Info *server)
|
|
{
|
|
return __cifs_get_super(tcp_super_cb, server);
|
|
}
|
|
|
|
void cifs_put_tcp_super(struct super_block *sb)
|
|
{
|
|
__cifs_put_super(sb);
|
|
}
|
|
|
|
#ifdef CONFIG_CIFS_DFS_UPCALL
|
|
int match_target_ip(struct TCP_Server_Info *server,
|
|
const char *share, size_t share_len,
|
|
bool *result)
|
|
{
|
|
int rc;
|
|
char *target;
|
|
struct sockaddr_storage ss;
|
|
|
|
*result = false;
|
|
|
|
target = kzalloc(share_len + 3, GFP_KERNEL);
|
|
if (!target)
|
|
return -ENOMEM;
|
|
|
|
scnprintf(target, share_len + 3, "\\\\%.*s", (int)share_len, share);
|
|
|
|
cifs_dbg(FYI, "%s: target name: %s\n", __func__, target + 2);
|
|
|
|
rc = dns_resolve_server_name_to_ip(target, (struct sockaddr *)&ss, NULL);
|
|
kfree(target);
|
|
|
|
if (rc < 0)
|
|
return rc;
|
|
|
|
spin_lock(&server->srv_lock);
|
|
*result = cifs_match_ipaddr((struct sockaddr *)&server->dstaddr, (struct sockaddr *)&ss);
|
|
spin_unlock(&server->srv_lock);
|
|
cifs_dbg(FYI, "%s: ip addresses match: %u\n", __func__, *result);
|
|
return 0;
|
|
}
|
|
|
|
int cifs_update_super_prepath(struct cifs_sb_info *cifs_sb, char *prefix)
|
|
{
|
|
kfree(cifs_sb->prepath);
|
|
|
|
if (prefix && *prefix) {
|
|
cifs_sb->prepath = kstrdup(prefix, GFP_ATOMIC);
|
|
if (!cifs_sb->prepath)
|
|
return -ENOMEM;
|
|
|
|
convert_delimiter(cifs_sb->prepath, CIFS_DIR_SEP(cifs_sb));
|
|
} else
|
|
cifs_sb->prepath = NULL;
|
|
|
|
cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_USE_PREFIX_PATH;
|
|
return 0;
|
|
}
|
|
#endif
|