660 lines
15 KiB
C
660 lines
15 KiB
C
/*
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* Copyright (c) 2006-2018, 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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* 2022-10-24 flybreak the first version
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* 2023-02-01 xqyjlj fix cannot open the same file repeatedly in 'w' mode
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*/
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#include <rthw.h>
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#include <rtthread.h>
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#include <dfs.h>
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#include <dfs_fs.h>
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#include <dfs_file.h>
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#ifdef RT_USING_SMART
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#include <lwp.h>
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#include <lwp_user_mm.h>
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#endif
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#include "dfs_tmpfs.h"
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#define DBG_TAG "tmpfs"
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#define DBG_LVL DBG_INFO
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#include <rtdbg.h>
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static int _path_separate(const char *path, char *parent_path, char *file_name)
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{
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const char *path_p, *path_q;
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RT_ASSERT(path[0] == '/');
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file_name[0] = '\0';
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path_p = path_q = &path[1];
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__next_dir:
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while (*path_q != '/' && *path_q != '\0')
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{
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path_q++;
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}
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if (path_q != path_p) /*sub dir*/
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{
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if (*path_q != '\0')
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{
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path_q++;
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path_p = path_q;
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goto __next_dir;
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}
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else /* Last level dir */
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{
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rt_memcpy(parent_path, path, path_p - path - 1);
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parent_path[path_p - path - 1] = '\0';
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rt_memcpy(file_name, path_p, path_q - path_p);
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file_name[path_q - path_p] = '\0';
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}
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}
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if (parent_path[0] == 0)
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{
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parent_path[0] = '/';
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parent_path[1] = '\0';
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}
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LOG_D("parent_path: %s", parent_path);
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LOG_D("file_name: %s", file_name);
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return 0;
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}
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static int _get_subdir(const char *path, char *name)
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{
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const char *subpath = path;
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while (*subpath == '/' && *subpath)
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subpath ++;
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while (*subpath != '/' && *subpath)
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{
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*name = *subpath;
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name ++;
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subpath ++;
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}
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return 0;
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}
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static int _free_subdir(struct tmpfs_file *dfile)
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{
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struct tmpfs_file *file;
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rt_list_t *list, *temp_list;
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RT_DEFINE_SPINLOCK(lock);
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RT_ASSERT(dfile->type == TMPFS_TYPE_DIR);
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rt_list_for_each_safe(list, temp_list, &dfile->subdirs)
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{
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file = rt_list_entry(list, struct tmpfs_file, sibling);
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if (file->type == TMPFS_TYPE_DIR)
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{
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_free_subdir(file);
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}
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if (file->data != NULL)
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{
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/* TODO: fix for rt-smart */
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rt_free(file->data);
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}
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rt_hw_spin_lock(&lock);
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rt_list_remove(&(file->sibling));
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rt_hw_spin_unlock(&lock);
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rt_free(file);
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}
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return 0;
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}
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int dfs_tmpfs_mount(struct dfs_filesystem *fs,
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unsigned long rwflag,
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const void *data)
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{
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struct tmpfs_sb *superblock;
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superblock = rt_calloc(1, sizeof(struct tmpfs_sb));
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superblock->df_size = sizeof(struct tmpfs_sb);
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superblock->magic = TMPFS_MAGIC;
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rt_list_init(&superblock->sibling);
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superblock->root.name[0] = '/';
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superblock->root.sb = superblock;
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superblock->root.type = TMPFS_TYPE_DIR;
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rt_list_init(&superblock->root.sibling);
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rt_list_init(&superblock->root.subdirs);
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fs->data = superblock;
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return RT_EOK;
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}
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int dfs_tmpfs_unmount(struct dfs_filesystem *fs)
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{
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struct tmpfs_sb *superblock;
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superblock = (struct tmpfs_sb *)fs->data;
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RT_ASSERT(superblock != NULL);
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_free_subdir(&(superblock->root));
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rt_free(superblock);
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fs->data = NULL;
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return RT_EOK;
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}
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int dfs_tmpfs_statfs(struct dfs_filesystem *fs, struct statfs *buf)
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{
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struct tmpfs_sb *superblock;
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superblock = (struct tmpfs_sb *)fs->data;
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RT_ASSERT(superblock != NULL);
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RT_ASSERT(buf != NULL);
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buf->f_bsize = 512;
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buf->f_blocks = (superblock->df_size + 511) / 512;
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buf->f_bfree = 1;
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buf->f_bavail = buf->f_bfree;
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return RT_EOK;
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}
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int dfs_tmpfs_ioctl(struct dfs_file *file, int cmd, void *args)
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{
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struct tmpfs_file *d_file;
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struct tmpfs_sb *superblock;
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d_file = (struct tmpfs_file *)file->vnode->data;
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RT_ASSERT(d_file != NULL);
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superblock = d_file->sb;
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RT_ASSERT(superblock != NULL);
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switch (cmd)
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{
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#ifdef RT_USING_SMART
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case RT_FIOMMAP2:
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{
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struct dfs_mmap2_args *mmap2 = (struct dfs_mmap2_args *)args;
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if (mmap2)
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{
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if (mmap2->length > file->vnode->size)
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{
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return -RT_ENOMEM;
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}
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LOG_D("tmpfile mmap ptr:%x , size:%d\n", d_file->data, mmap2->length);
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mmap2->ret = lwp_map_user_phy(lwp_self(), RT_NULL, d_file->data, mmap2->length, 0);
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}
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return RT_EOK;
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break;
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}
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#endif
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default:
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break;
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}
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return -EIO;
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}
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struct tmpfs_file *dfs_tmpfs_lookup(struct tmpfs_sb *superblock,
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const char *path,
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rt_size_t *size)
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{
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const char *subpath, *curpath, *filename = RT_NULL;
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char subdir_name[TMPFS_NAME_MAX];
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struct tmpfs_file *file, *curfile;
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rt_list_t *list;
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RT_DEFINE_SPINLOCK(lock);
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subpath = path;
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while (*subpath == '/' && *subpath)
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subpath ++;
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if (! *subpath) /* is root directory */
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{
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*size = 0;
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return &(superblock->root);
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}
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curpath = subpath;
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curfile = &superblock->root;
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find_subpath:
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while (*subpath != '/' && *subpath)
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subpath ++;
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if (! *subpath) /* is last directory */
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filename = curpath;
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else
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subpath ++; /* skip '/' */
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memset(subdir_name, 0, TMPFS_NAME_MAX);
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_get_subdir(curpath, subdir_name);
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rt_hw_spin_lock(&lock);
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rt_list_for_each(list, &curfile->subdirs)
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{
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file = rt_list_entry(list, struct tmpfs_file, sibling);
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if (filename) /* find file */
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{
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if (rt_strcmp(file->name, filename) == 0)
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{
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*size = file->size;
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rt_hw_spin_unlock(&lock);
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return file;
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}
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}
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else if (rt_strcmp(file->name, subdir_name) == 0)
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{
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*size = file->size;
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curpath = subpath;
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curfile = file;
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rt_hw_spin_unlock(&lock);
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goto find_subpath;
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}
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}
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rt_hw_spin_unlock(&lock);
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/* not found */
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return NULL;
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}
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int dfs_tmpfs_read(struct dfs_file *file, void *buf, size_t count)
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{
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rt_size_t length;
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struct tmpfs_file *d_file;
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d_file = (struct tmpfs_file *)file->vnode->data;
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RT_ASSERT(d_file != NULL);
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if (count < file->vnode->size - file->pos)
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length = count;
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else
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length = file->vnode->size - file->pos;
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if (length > 0)
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memcpy(buf, &(d_file->data[file->pos]), length);
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/* update file current position */
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file->pos += length;
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return length;
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}
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int dfs_tmpfs_write(struct dfs_file *fd, const void *buf, size_t count)
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{
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struct tmpfs_file *d_file;
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struct tmpfs_sb *superblock;
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d_file = (struct tmpfs_file *)fd->vnode->data;
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RT_ASSERT(d_file != NULL);
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superblock = d_file->sb;
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RT_ASSERT(superblock != NULL);
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if (count + fd->pos > fd->vnode->size)
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{
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rt_uint8_t *ptr;
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ptr = rt_realloc(d_file->data, fd->pos + count);
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if (ptr == NULL)
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{
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rt_set_errno(-ENOMEM);
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return 0;
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}
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superblock->df_size += (fd->pos - d_file->size + count);
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/* update d_file and file size */
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d_file->data = ptr;
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d_file->size = fd->pos + count;
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fd->vnode->size = d_file->size;
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LOG_D("tmpfile ptr:%x, size:%d", ptr, d_file->size);
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}
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if (count > 0)
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memcpy(d_file->data + fd->pos, buf, count);
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/* update file current position */
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fd->pos += count;
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return count;
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}
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int dfs_tmpfs_lseek(struct dfs_file *file, off_t offset)
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{
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if (offset <= (off_t)file->vnode->size)
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{
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file->pos = offset;
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return file->pos;
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}
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return -EIO;
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}
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int dfs_tmpfs_close(struct dfs_file *file)
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{
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RT_ASSERT(file->vnode->ref_count > 0);
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if (file->vnode->ref_count > 1)
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{
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return 0;
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}
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file->vnode->data = NULL;
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return RT_EOK;
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}
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int dfs_tmpfs_open(struct dfs_file *file)
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{
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rt_size_t size;
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struct tmpfs_sb *superblock;
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struct tmpfs_file *d_file, *p_file;
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struct dfs_filesystem *fs;
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char parent_path[DFS_PATH_MAX],file_name[TMPFS_NAME_MAX];
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RT_DEFINE_SPINLOCK(lock);
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RT_ASSERT(file->vnode->ref_count > 0);
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if (file->vnode->ref_count > 1)
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{
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if (file->vnode->type == FT_DIRECTORY
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&& !(file->flags & O_DIRECTORY))
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{
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return -ENOENT;
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}
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file->pos = 0;
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return 0;
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}
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fs = file->vnode->fs;
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superblock = (struct tmpfs_sb *)fs->data;
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RT_ASSERT(superblock != NULL);
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/* find file */
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d_file = dfs_tmpfs_lookup(superblock, file->vnode->path, &size);
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if (d_file == NULL && !(file->flags & O_CREAT))
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return -ENOENT;
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/* Creates a new file. */
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if (file->flags & O_CREAT)
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{
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if (d_file == NULL)
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{
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/* find parent file */
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_path_separate(file->vnode->path, parent_path, file_name);
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if (file_name[0] == '\0') /* it's root dir */
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return -ENOENT;
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/* open parent directory */
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p_file = dfs_tmpfs_lookup(superblock, parent_path, &size);
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if (p_file == NULL)
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return -ENOENT;
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/* create a file entry */
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d_file = (struct tmpfs_file *)rt_calloc(1, sizeof(struct tmpfs_file));
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if (d_file == NULL)
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{
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return -ENOMEM;
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}
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superblock->df_size += sizeof(struct tmpfs_file);
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strncpy(d_file->name, file_name, TMPFS_NAME_MAX);
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rt_list_init(&(d_file->subdirs));
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rt_list_init(&(d_file->sibling));
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d_file->data = NULL;
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d_file->size = 0;
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d_file->sb = superblock;
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if (file->flags & O_DIRECTORY)
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{
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d_file->type = TMPFS_TYPE_DIR;
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}
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else
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{
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d_file->type = TMPFS_TYPE_FILE;
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}
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rt_hw_spin_lock(&lock);
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rt_list_insert_after(&(p_file->subdirs), &(d_file->sibling));
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rt_hw_spin_unlock(&lock);
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}
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}
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/* Creates a new file.
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* If the file is existing, it is truncated and overwritten.
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*/
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if (file->flags & O_TRUNC)
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{
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d_file->size = 0;
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if (d_file->data != NULL)
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{
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/* ToDo: fix for rt-smart. */
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rt_free(d_file->data);
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d_file->data = NULL;
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}
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}
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/* fill file */
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if (d_file->type == TMPFS_TYPE_DIR)
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{
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if (file->flags & O_DIRECTORY)
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file->vnode->type = FT_DIRECTORY;
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else
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return -ENOMEM;
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}
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else
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{
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if (file->flags & O_DIRECTORY)
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{
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return -ENOMEM;
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}
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file->vnode->type = FT_DEVICE;
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}
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file->vnode->data = d_file;
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file->vnode->size = d_file->size;
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if (file->flags & O_APPEND)
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{
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file->pos = file->vnode->size;
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}
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else
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{
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file->pos = 0;
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}
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return 0;
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}
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int dfs_tmpfs_stat(struct dfs_filesystem *fs,
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const char *path,
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struct stat *st)
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{
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rt_size_t size;
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struct tmpfs_file *d_file;
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struct tmpfs_sb *superblock;
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superblock = (struct tmpfs_sb *)fs->data;
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d_file = dfs_tmpfs_lookup(superblock, path, &size);
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if (d_file == NULL)
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return -ENOENT;
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st->st_dev = 0;
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st->st_mode = S_IFREG | S_IRUSR | S_IRGRP | S_IROTH |
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S_IWUSR | S_IWGRP | S_IWOTH;
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if (d_file->type == TMPFS_TYPE_DIR)
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{
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st->st_mode &= ~S_IFREG;
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st->st_mode |= S_IFDIR | S_IXUSR | S_IXGRP | S_IXOTH;
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}
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st->st_size = d_file->size;
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st->st_mtime = 0;
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return RT_EOK;
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}
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int dfs_tmpfs_getdents(struct dfs_file *file,
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struct dirent *dirp,
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uint32_t count)
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{
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rt_size_t index, end;
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struct dirent *d;
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struct tmpfs_file *d_file, *n_file;
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rt_list_t *list;
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struct tmpfs_sb *superblock;
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d_file = (struct tmpfs_file *)file->vnode->data;
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superblock = d_file->sb;
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RT_ASSERT(superblock != RT_NULL);
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/* make integer count */
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count = (count / sizeof(struct dirent));
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if (count == 0)
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return -EINVAL;
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end = file->pos + count;
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index = 0;
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count = 0;
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rt_list_for_each(list, &d_file->subdirs)
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{
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n_file = rt_list_entry(list, struct tmpfs_file, sibling);
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if (index >= (rt_size_t)file->pos)
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{
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d = dirp + count;
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if (d_file->type == TMPFS_TYPE_FILE)
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{
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d->d_type = DT_REG;
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}
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if (d_file->type == TMPFS_TYPE_DIR)
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{
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d->d_type = DT_DIR;
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}
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d->d_namlen = RT_NAME_MAX;
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d->d_reclen = (rt_uint16_t)sizeof(struct dirent);
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rt_strncpy(d->d_name, n_file->name, TMPFS_NAME_MAX);
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count += 1;
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file->pos += 1;
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}
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index += 1;
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if (index >= end)
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{
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break;
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}
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}
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return count * sizeof(struct dirent);
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}
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int dfs_tmpfs_unlink(struct dfs_filesystem *fs, const char *path)
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{
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rt_size_t size;
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struct tmpfs_sb *superblock;
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struct tmpfs_file *d_file;
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|
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RT_DEFINE_SPINLOCK(lock);
|
|
|
|
superblock = (struct tmpfs_sb *)fs->data;
|
|
RT_ASSERT(superblock != NULL);
|
|
|
|
d_file = dfs_tmpfs_lookup(superblock, path, &size);
|
|
if (d_file == NULL)
|
|
return -ENOENT;
|
|
|
|
rt_hw_spin_lock(&lock);
|
|
rt_list_remove(&(d_file->sibling));
|
|
rt_hw_spin_unlock(&lock);
|
|
|
|
if (d_file->data != NULL)
|
|
rt_free(d_file->data);
|
|
rt_free(d_file);
|
|
|
|
return RT_EOK;
|
|
}
|
|
|
|
int dfs_tmpfs_rename(struct dfs_filesystem *fs,
|
|
const char *oldpath,
|
|
const char *newpath)
|
|
{
|
|
struct tmpfs_file *d_file, *p_file;
|
|
struct tmpfs_sb *superblock;
|
|
rt_size_t size;
|
|
char parent_path[DFS_PATH_MAX],file_name[TMPFS_NAME_MAX];
|
|
|
|
RT_DEFINE_SPINLOCK(lock);
|
|
|
|
superblock = (struct tmpfs_sb *)fs->data;
|
|
RT_ASSERT(superblock != NULL);
|
|
|
|
d_file = dfs_tmpfs_lookup(superblock, newpath, &size);
|
|
if (d_file != NULL)
|
|
return -EEXIST;
|
|
|
|
d_file = dfs_tmpfs_lookup(superblock, oldpath, &size);
|
|
if (d_file == NULL)
|
|
return -ENOENT;
|
|
|
|
/* find parent file */
|
|
_path_separate(newpath, parent_path, file_name);
|
|
if (file_name[0] == '\0') /* it's root dir */
|
|
return -ENOENT;
|
|
/* open parent directory */
|
|
p_file = dfs_tmpfs_lookup(superblock, parent_path, &size);
|
|
RT_ASSERT(p_file != NULL);
|
|
|
|
rt_hw_spin_lock(&lock);
|
|
rt_list_remove(&(d_file->sibling));
|
|
rt_hw_spin_unlock(&lock);
|
|
|
|
strncpy(d_file->name, file_name, TMPFS_NAME_MAX);
|
|
|
|
rt_hw_spin_lock(&lock);
|
|
rt_list_insert_after(&(p_file->subdirs), &(d_file->sibling));
|
|
rt_hw_spin_unlock(&lock);
|
|
|
|
return RT_EOK;
|
|
}
|
|
|
|
static const struct dfs_file_ops _tmp_fops =
|
|
{
|
|
dfs_tmpfs_open,
|
|
dfs_tmpfs_close,
|
|
dfs_tmpfs_ioctl,
|
|
dfs_tmpfs_read,
|
|
dfs_tmpfs_write,
|
|
NULL, /* flush */
|
|
dfs_tmpfs_lseek,
|
|
dfs_tmpfs_getdents,
|
|
};
|
|
|
|
static const struct dfs_filesystem_ops _tmpfs =
|
|
{
|
|
"tmp",
|
|
DFS_FS_FLAG_DEFAULT,
|
|
&_tmp_fops,
|
|
|
|
dfs_tmpfs_mount,
|
|
dfs_tmpfs_unmount,
|
|
NULL, /* mkfs */
|
|
dfs_tmpfs_statfs,
|
|
|
|
dfs_tmpfs_unlink,
|
|
dfs_tmpfs_stat,
|
|
dfs_tmpfs_rename,
|
|
};
|
|
|
|
int dfs_tmpfs_init(void)
|
|
{
|
|
/* register tmp file system */
|
|
dfs_register(&_tmpfs);
|
|
|
|
return 0;
|
|
}
|