2021-03-11 18:43:57 +08:00
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# Copyright (c) 2013-2019 Huawei Technologies Co., Ltd. All rights reserved.
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# Copyright (c) 2020-2021 Huawei Device Co., Ltd. All rights reserved.
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2020-09-08 10:21:39 +08:00
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#
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# Redistribution and use in source and binary forms, with or without modification,
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# are permitted provided that the following conditions are met:
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#
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# 1. Redistributions of source code must retain the above copyright notice, this list of
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# conditions and the following disclaimer.
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#
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# 2. Redistributions in binary form must reproduce the above copyright notice, this list
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# of conditions and the following disclaimer in the documentation and/or other materials
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# provided with the distribution.
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#
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# 3. Neither the name of the copyright holder nor the names of its contributors may be used
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# to endorse or promote products derived from this software without specific prior written
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# permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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# THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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# EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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# OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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# WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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# OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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# ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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include $(LITEOSTOPDIR)/config.mk
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MODULE_NAME := $(notdir $(shell pwd))
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LOCAL_SRCS := \
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2021-01-14 16:50:10 +08:00
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$(LITEOSTOPDIR)/fs/vfs/mount.c \
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$(LITEOSTOPDIR)/fs/vfs/vnode.c \
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$(LITEOSTOPDIR)/fs/vfs/path_cache.c \
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$(LITEOSTOPDIR)/fs/vfs/vnode_hash.c \
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2020-09-08 10:21:39 +08:00
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$(LITEOSTHIRDPARTY)/NuttX/fs/vfs/fs_close.c \
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$(LITEOSTHIRDPARTY)/NuttX/fs/vfs/fs_dup2.c \
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$(LITEOSTHIRDPARTY)/NuttX/fs/vfs/fs_dup.c \
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$(LITEOSTHIRDPARTY)/NuttX/fs/vfs/fs_dupfd2.c \
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$(LITEOSTHIRDPARTY)/NuttX/fs/vfs/fs_dupfd.c \
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$(LITEOSTHIRDPARTY)/NuttX/fs/vfs/fs_fcntl.c \
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$(LITEOSTHIRDPARTY)/NuttX/fs/vfs/fs_fsync.c \
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$(LITEOSTHIRDPARTY)/NuttX/fs/vfs/fs_getfilep.c \
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$(LITEOSTHIRDPARTY)/NuttX/fs/vfs/fs_ioctl.c \
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$(LITEOSTHIRDPARTY)/NuttX/fs/vfs/fs_lseek.c \
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$(LITEOSTHIRDPARTY)/NuttX/fs/vfs/fs_lseek64.c \
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$(LITEOSTHIRDPARTY)/NuttX/fs/vfs/fs_mkdir.c \
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$(LITEOSTHIRDPARTY)/NuttX/fs/vfs/fs_open.c \
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$(LITEOSTHIRDPARTY)/NuttX/fs/vfs/fs_poll.c \
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$(LITEOSTHIRDPARTY)/NuttX/fs/vfs/fs_pread.c \
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$(LITEOSTHIRDPARTY)/NuttX/fs/vfs/fs_pread64.c \
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$(LITEOSTHIRDPARTY)/NuttX/fs/vfs/fs_pwrite.c \
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$(LITEOSTHIRDPARTY)/NuttX/fs/vfs/fs_pwrite64.c \
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$(LITEOSTHIRDPARTY)/NuttX/fs/vfs/fs_read.c \
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$(LITEOSTHIRDPARTY)/NuttX/fs/vfs/fs_rename.c \
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$(LITEOSTHIRDPARTY)/NuttX/fs/vfs/fs_rmdir.c \
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$(LITEOSTHIRDPARTY)/NuttX/fs/vfs/fs_select.c \
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$(LITEOSTHIRDPARTY)/NuttX/fs/vfs/fs_sendfile.c \
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$(LITEOSTHIRDPARTY)/NuttX/fs/vfs/fs_stat.c \
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$(LITEOSTHIRDPARTY)/NuttX/fs/vfs/fs_statfs.c \
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$(LITEOSTHIRDPARTY)/NuttX/fs/vfs/fs_truncate.c \
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$(LITEOSTHIRDPARTY)/NuttX/fs/vfs/fs_truncate64.c \
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$(LITEOSTHIRDPARTY)/NuttX/fs/vfs/fs_unlink.c \
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feat: support link/symlink/readlink
新增link/symlink/readlink接口的系统调用及内核实现,当前仅支持jffs2文件系统。具体接口说明如下:
一、hard link
接口原型:
int link(const char *oldpath, const char *newpath);
int linkat(int olddirfd, const char *oldpath, int newdirfd, const char *newpath, int flags);
作用:
创建oldpath的硬链接,名为newpath。
功能说明:
1、newpath与oldpath必须在同一挂载分区内。
2、若newpath已存在,不会覆盖,错误码EEXIST。
3、oldpath必须为普通文件或者软链接文件。
4、如果oldpath是一个软链接文件,那么:
若调用link接口或者linkat(flags=0),创建出软链接文件的硬链接;
若调用linkat(flags = AT_SYMLINK_FOLLOW),创建出软链接所指向源文件的硬链接。
5、oldpath与newpath对应同一个文件,对oldpath与newpath任一名字的操作都是直接操作文件,没有“原始文件”的说法。
6、使用cp命令拷贝一个硬链接文件,生成文件的拷贝,新文件的nlink数为1。
7、删除oldpath或newpath,底层文件仍存在,可以通过另一个path访问。只有当两个path都删除之后,才会真正将文件删除,空间释放。
二、symbol link
接口原型:
int symlink(const char *target, const char *linkpath);
int symlinkat(const char *target, int newdirfd, const char *linkpath);
作用:
创建一个软链接文件linkpath,存储字符串target。
功能说明:
1、target可以为任意字符串(长度小于PATH_MAX)。
2、若linkpath文件名已存在,不会覆盖,错误码EEXIST。
3、用readlink函数可读取软链接的target内容。
4、软链接文件本身大小为target长度。
5、ls时软链接文件类型显示为 'l'。
6、symlink最大循环次数为CONFIG_FS_MAX_LNK_CNT(目前为40),超出则返回错误,错误码ELOOP。
7、使用cp命令拷贝一个软链接文件:
若target是一个文件:创建一个源文件的拷贝,类型为普通文件;
若target非文件:拷贝失败。
三、readlink
接口原型:
ssize_t readlink(const char *pathname, char *buf, size_t bufsiz);
ssize_t readlinkat(int dirfd, const char *pathname, char *buf, size_t bufsiz);
作用:
读取软链接文件存放的的target内容。
功能说明:
1、pathname必须为软链接文件,否则错误码EINVAL。
2、如果bufsiz小于target长度,则截断target。
close #I3Q0OD
Change-Id: I3864d6069b627b705a369e8e32dc1eb922dc0157
Signed-off-by: chenjing <chenjing139@huawei.com>
2021-06-04 10:30:12 +08:00
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$(LITEOSTHIRDPARTY)/NuttX/fs/vfs/fs_link.c \
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$(LITEOSTHIRDPARTY)/NuttX/fs/vfs/fs_readlink.c \
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$(LITEOSTHIRDPARTY)/NuttX/fs/vfs/fs_symlink.c \
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2020-09-08 10:21:39 +08:00
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$(LITEOSTHIRDPARTY)/NuttX/fs/vfs/fs_write.c \
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$(wildcard operation/*.c) \
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\
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$(LITEOSTHIRDPARTY)/NuttX/fs/inode/fs_files.c \
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\
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$(LITEOSTHIRDPARTY)/NuttX/fs/dirent/fs_closedir.c \
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$(LITEOSTHIRDPARTY)/NuttX/fs/dirent/fs_opendir.c \
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$(LITEOSTHIRDPARTY)/NuttX/fs/dirent/fs_readdir.c \
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$(LITEOSTHIRDPARTY)/NuttX/fs/dirent/fs_rewinddir.c \
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$(LITEOSTHIRDPARTY)/NuttX/fs/dirent/fs_seekdir.c \
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$(LITEOSTHIRDPARTY)/NuttX/fs/dirent/fs_telldir.c \
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\
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$(LITEOSTHIRDPARTY)/NuttX/fs/mount/fs_mount.c \
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$(LITEOSTHIRDPARTY)/NuttX/fs/mount/fs_umount.c \
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\
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$(LITEOSTHIRDPARTY)/NuttX/fs/driver/fs_blockproxy.c \
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2021-01-14 16:50:10 +08:00
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$(LITEOSTHIRDPARTY)/NuttX/fs/mount/fs_foreachmountpoint.c \
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2020-09-08 10:21:39 +08:00
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$(LITEOSTHIRDPARTY)/NuttX/fs/driver/fs_findblockdriver.c \
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$(LITEOSTHIRDPARTY)/NuttX/fs/driver/fs_openblockdriver.c \
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2021-01-14 16:50:10 +08:00
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$(LITEOSTHIRDPARTY)/NuttX/fs/driver/fs_closeblockdriver.c \
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2020-09-08 10:21:39 +08:00
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$(LITEOSTHIRDPARTY)/NuttX/fs/driver/fs_registerblockdriver.c \
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$(LITEOSTHIRDPARTY)/NuttX/fs/driver/fs_registerdriver.c \
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$(LITEOSTHIRDPARTY)/NuttX/fs/driver/fs_unregisterblockdriver.c \
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$(LITEOSTHIRDPARTY)/NuttX/fs/driver/fs_unregisterdriver.c \
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\
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$(wildcard vfs_cmd/*.c)
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LOCAL_INCLUDE := \
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-I $(LITEOSTOPDIR)/fs/vfs/include \
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-I $(LITEOSTOPDIR)/fs/vfs/include/bcache\
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2021-06-15 20:55:38 +08:00
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-I $(LITEOSTOPDIR)/drivers/block/disk/include\
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-I $(LITEOSTOPDIR)/drivers/char/bch/include\
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-I $(LITEOSTOPDIR)/drivers/mtd/multi_partition/include\
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2020-09-08 10:21:39 +08:00
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-I $(LITEOSTOPDIR)/fs/vfs/include/operation\
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2021-01-14 16:50:10 +08:00
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-I $(LITEOSTOPDIR)/syscall\
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2020-09-08 10:21:39 +08:00
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ifeq ($(LOSCFG_FS_FAT), y)
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LOCAL_INCLUDE += -I $(LITEOSTHIRDPARTY)/FatFs/source
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endif
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LOCAL_FLAGS := $(LOCAL_INCLUDE) $(LITEOS_GCOV_OPTS)
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include $(MODULE)
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