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>
81 lines
2.5 KiB
C
81 lines
2.5 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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* 2023-05-05 Bernard Implement dentry in dfs v2.0
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*/
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#ifndef DFS_MNT_H__
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#define DFS_MNT_H__
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#include <rtservice.h>
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#include <rtthread.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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struct dfs_mnt;
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struct dfs_dentry;
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struct dfs_filesystem_ops;
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struct dfs_mnt
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{
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struct dfs_mnt *parent; /* the parent mounted file system */
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rt_list_t sibling; /* the sibling node for mounted list */
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rt_list_t child; /* the child node for mounted list */
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char *fullpath; /* the fullpath of this mounted file system */
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int flags; /* the falgs of this mounted file system */
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#define MNT_IS_ALLOCED 0x1 /* the mnt struct is allocated */
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#define MNT_IS_ADDLIST 0x2 /* the mnt struct is added into list */
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#define MNT_IS_MOUNTED 0x4 /* the mnt struct is mounted */
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#define MNT_IS_UMOUNT 0x8 /* the mnt is unmount */
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#define MNT_IS_LOCKED 0x10 /* the mnt is locked */
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#define MNT_FORCE 0x20 /* the mnt force unmount */
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#define MNT_LAZY_UMNT 0x40 /* the mnt has pending umount */
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#define MNT_RDONLY 0x80 /* the mnt is read only */
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rt_atomic_t ref_count; /* reference count */
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rt_device_t dev_id; /* the mounted device id */
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const struct dfs_filesystem_ops *fs_ops;
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void *data;
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};
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struct dfs_mnt *dfs_mnt_create(const char *path);
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int dfs_mnt_destroy(struct dfs_mnt* mnt);
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int dfs_mnt_list(struct dfs_mnt* mnt);
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int dfs_mnt_insert(struct dfs_mnt* mnt, struct dfs_mnt* child);
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struct dfs_mnt *dfs_mnt_dev_lookup(rt_device_t dev_id);
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struct dfs_mnt *dfs_mnt_lookup(const char *path);
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const char *dfs_mnt_get_mounted_path(struct rt_device *device);
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struct dfs_mnt* dfs_mnt_ref(struct dfs_mnt* mnt);
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int dfs_mnt_unref(struct dfs_mnt* mnt);
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int dfs_mnt_umount(struct dfs_mnt *mnt, int flags);
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int dfs_mnt_setflags(struct dfs_mnt *mnt, int flags);
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rt_bool_t dfs_mnt_has_child_mnt(struct dfs_mnt *mnt, const char* fullpath);
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int dfs_mnt_foreach(struct dfs_mnt* (*func)(struct dfs_mnt *mnt, void *parameter), void *parameter);
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int dfs_mnt_umount_iter(rt_bool_t (*filter)(struct dfs_mnt *mnt, void *parameter), void *parameter);
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typedef void (*dfs_mnt_umnt_cb_t)(struct dfs_mnt *mnt);
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RT_OBJECT_HOOKLIST_DECLARE(dfs_mnt_umnt_cb_t, dfs_mnt_umnt);
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#ifdef __cplusplus
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}
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#endif
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#endif
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