1 /* 2 * Copyright (c) 2021-2021 Huawei Device Co., Ltd. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without modification, 5 * are permitted provided that the following conditions are met: 6 * 7 * 1. Redistributions of source code must retain the above copyright notice, this list of 8 * conditions and the following disclaimer. 9 * 10 * 2. Redistributions in binary form must reproduce the above copyright notice, this list 11 * of conditions and the following disclaimer in the documentation and/or other materials 12 * provided with the distribution. 13 * 14 * 3. Neither the name of the copyright holder nor the names of its contributors may be used 15 * to endorse or promote products derived from this software without specific prior written 16 * permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 20 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 21 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR 22 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 23 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 24 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 25 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 26 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 27 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 28 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #ifndef _MOUNT_H_ 32 #define _MOUNT_H_ 33 34 #include <sys/stat.h> 35 #include <sys/statfs.h> 36 #include "vnode.h" 37 38 #define MS_RDONLY 1 39 #define MS_NOSYNC 2 40 41 struct MountOps; 42 43 struct Mount { 44 LIST_ENTRY mountList; /* mount list */ 45 const struct MountOps *ops; /* operations of mount */ 46 struct Vnode *vnodeBeCovered; /* vnode we mounted on */ 47 struct Vnode *vnodeCovered; /* syncer vnode */ 48 struct Vnode *vnodeDev; /* dev vnode */ 49 LIST_HEAD vnodeList; /* list of vnodes */ 50 int vnodeSize; /* size of vnode list */ 51 LIST_HEAD activeVnodeList; /* list of active vnodes */ 52 int activeVnodeSize; /* size of active vnodes list */ 53 void *data; /* private data */ 54 uint32_t hashseed; /* Random seed for vfshash */ 55 unsigned long mountFlags; /* Flags for mount */ 56 char pathName[PATH_MAX]; /* path name of mount point */ 57 char devName[PATH_MAX]; /* path name of dev point */ 58 }; 59 60 struct MountOps { 61 int (*Mount)(struct Mount *mount, struct Vnode *vnode, const void *data); 62 int (*Unmount)(struct Mount *mount, struct Vnode **blkdriver); 63 int (*Statfs)(struct Mount *mount, struct statfs *sbp); 64 int (*Sync)(struct Mount *mount); 65 }; 66 67 typedef int (*foreach_mountpoint_t)(const char *devpoint, 68 const char *mountpoint, 69 struct statfs *statbuf, 70 void *arg); 71 72 struct Mount* MountAlloc(struct Vnode* vnode, struct MountOps* mop); 73 LIST_HEAD* GetMountList(void); 74 int foreach_mountpoint(foreach_mountpoint_t handler, void *arg); 75 int ForceUmountDev(struct Vnode *dev); 76 #endif 77