b63b388d1f
This patch introduces a remount feature for the DFS, allowing for the modification of mount parameters without unmounting the filesystem, the remount functionality helps modify certain mount flags (like `MS_RDONLY`) without requiring an unmount, providing more control over mounted filesystems in the system. The updates is essential for user space init proc to cleanup the runtime resource, ensuring clean handling of cached data and enhancing system robustness during power down processing. Changes: - Defined new constants for remount flags in `dfs_fs.h`. - Added the `dfs_remount()` function in `dfs_fs.c` to handle remount operations. - Introduced a check for unsupported flags and handle error conditions such as invalid paths or non-directory targets. - Updated the `dfs_mnt` structure in `dfs_mnt.h` to include a read-only flag (`MNT_RDONLY`). - The `dfs_remount()` function allows changing the read-only status of a mounted filesystem. - Added `MNT_LAZY_UMNT` and `MNT_RDONLY` flags to `dfs_mnt` structure. - Introduced `dfs_mnt_setflags` function for dynamic flag management. - Updated `dfs_remount` to utilize `dfs_mnt_setflags` for flag setting. - Enhanced unmount operations with `dfs_mnt_umount_iter` and lazy unmounting. - Added `dfs_pcache_clean` to handle cache cleanup for read-only mounts. - Improved error reporting in `dfs_umount` for better user feedback. - Refactored `sys_mount` to streamline parameter handling and support remounts. - Introduced `_cp_from_usr_string` helper for user-space string operations. - Updated internal APIs to ensure consistency in reference count management. Signed-off-by: Shell <smokewood@qq.com>
142 lines
3.8 KiB
C
142 lines
3.8 KiB
C
/*
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* Copyright (c) 2006-2023, RT-Thread Development Team
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Change Logs:
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* Date Author Notes
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* 2005-02-22 Bernard The first version.
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* 2023-05-05 Bernard Change to dfs v2.0
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*/
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#ifndef __DFS_FS_H__
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#define __DFS_FS_H__
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#include <dfs.h>
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#include <dfs_file.h>
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#ifdef __cplusplus
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extern "C"
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{
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#endif
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#define MS_RDONLY 1
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#define MS_NOSUID 2
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#define MS_NODEV 4
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#define MS_NOEXEC 8
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#define MS_SYNCHRONOUS 16
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#define MS_REMOUNT 32
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#define MS_MANDLOCK 64
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#define MS_DIRSYNC 128
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#define MS_NOATIME 1024
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#define MS_NODIRATIME 2048
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#define MS_BIND 4096
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#define MS_MOVE 8192
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#define MS_REC 16384
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#define MS_SILENT 32768
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#define MS_POSIXACL (1<<16)
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#define MS_UNBINDABLE (1<<17)
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#define MS_PRIVATE (1<<18)
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#define MS_SLAVE (1<<19)
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#define MS_SHARED (1<<20)
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#define MS_RELATIME (1<<21)
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#define MS_KERNMOUNT (1<<22)
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#define MS_I_VERSION (1<<23)
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#define MS_STRICTATIME (1<<24)
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#define MS_LAZYTIME (1<<25)
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#define MS_NOREMOTELOCK (1<<27)
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#define MS_NOSEC (1<<28)
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#define MS_BORN (1<<29)
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#define MS_ACTIVE (1<<30)
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#define MS_NOUSER (1U<<31)
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#define MS_RMT_MASK (MS_RDONLY|MS_SYNCHRONOUS|MS_MANDLOCK|MS_I_VERSION|MS_LAZYTIME)
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/* file system partition table */
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struct dfs_partition
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{
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uint8_t type; /* file system type */
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off_t offset; /* partition start offset */
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size_t size; /* partition size */
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rt_sem_t lock;
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};
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struct dfs_attr
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{
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unsigned int ia_valid;
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uid_t st_uid;
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gid_t st_gid;
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mode_t st_mode;
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struct timespec ia_atime;
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struct timespec ia_mtime;
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};
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struct dfs_mnt;
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struct dfs_dentry;
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struct dfs_vnode;
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struct statfs;
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struct dfs_filesystem_ops
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{
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const char *name;
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uint32_t flags;
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#define FS_NEED_DEVICE 0x1
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const struct dfs_file_ops *default_fops;
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int (*mount)(struct dfs_mnt *mnt, unsigned long rwflag, const void *data);
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int (*umount)(struct dfs_mnt *mnt);
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int (*mkfs)(rt_device_t devid, const char *fs_name);
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int (*readlink)(struct dfs_dentry *dentry, char *buf, int len);
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int (*link)(struct dfs_dentry *src_dentry, struct dfs_dentry *dst_dentry); /*hard link interface */
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int (*unlink)(struct dfs_dentry *dentry);
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int (*symlink)(struct dfs_dentry *parent_dentry, const char *target, const char *newpath); /*soft link interface*/
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int (*rename)(struct dfs_dentry *old_dentry, struct dfs_dentry *new_dentry);
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int (*stat)(struct dfs_dentry *dentry, struct stat *buf);
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int (*statfs)(struct dfs_mnt *mnt, struct statfs *buf);
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int (*setattr) (struct dfs_dentry *dentry, struct dfs_attr *attr);
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struct dfs_vnode* (*lookup)(struct dfs_dentry *dentry);
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struct dfs_vnode* (*create_vnode)(struct dfs_dentry *dentry, int type, mode_t mode);
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int (*free_vnode)(struct dfs_vnode* vnode);
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};
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struct dfs_filesystem_type
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{
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const struct dfs_filesystem_ops *fs_ops;
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struct dfs_filesystem_type *next;
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};
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struct dfs_filesystem_type *dfs_filesystems(void);
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int dfs_unregister(struct dfs_filesystem_type *fs);
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int dfs_register(struct dfs_filesystem_type *fs);
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const char *dfs_filesystem_get_mounted_path(struct rt_device *device);
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int dfs_remount(const char *path, rt_ubase_t flags, void *data);
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int dfs_mount(const char *device_name,
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const char *path,
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const char *filesystemtype,
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unsigned long rwflag,
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const void *data);
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int dfs_umount(const char *specialfile, int flags);
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int dfs_unmount(const char *specialfile);
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int dfs_is_mounted(struct dfs_mnt *mnt);
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int dfs_mkfs(const char *fs_name, const char *device_name);
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int dfs_statfs(const char *path, struct statfs *buffer);
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int dfs_filesystem_get_partition(struct dfs_partition *part,
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uint8_t *buf,
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uint32_t pindex);
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#ifdef __cplusplus
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}
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#endif
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#endif
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