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dfs_file.c
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/*
* Copyright (c) 2006-2023, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2023-05-05 Bernard Implement file APIs in dfs v2.0
*/
#include "errno.h"
#include "fcntl.h"
#include <dfs.h>
#include "dfs_file.h"
#include "dfs_dentry.h"
#include "dfs_fs.h"
#include "dfs_mnt.h"
#include "dfs_private.h"
#ifdef RT_USING_PAGECACHE
#include "dfs_pcache.h"
#endif
#define DBG_TAG "DFS.file"
#define DBG_LVL DBG_WARNING
#include <rtdbg.h>
#define MAX_RW_COUNT 0xfffc0000
rt_inline int _first_path_len(const char *path)
{
int i = 0;
if (path[i] == '/')
{
i++;
while (path[i] != '\0' && path[i] != '/')
{
i++;
}
}
return i;
}
static int _get_parent_path(const char *fullpath, char *path)
{
int len = 0;
char *str = 0;
str = strrchr(fullpath, '/');
/* skip last '/' */
if (str && *(str + 1) == '\0')
{
str = strrchr(str - 1, '/');
}
if (str)
{
len = str - fullpath;
if (len > 0)
{
rt_memcpy(path, fullpath, len);
path[len] = '\0';
}
}
return len;
}
static int _try_readlink(const char *path, struct dfs_mnt *mnt, char *link)
{
int ret = -1;
struct dfs_dentry *dentry = dfs_dentry_lookup(mnt, path, 0);
if (dentry && dentry->vnode->type == FT_SYMLINK)
{
if (mnt->fs_ops->readlink)
{
if (dfs_is_mounted(mnt) == 0)
{
ret = mnt->fs_ops->readlink(dentry, link, DFS_PATH_MAX);
}
}
}
dfs_dentry_unref(dentry);
return ret;
}
static char *_dfs_normalize_path(const char *path, int path_len, const char *link_fn, int link_len)
{
char *tmp_path, *fp;
tmp_path = (char *)rt_malloc(path_len + link_len + 2);
if (!tmp_path)
{
return RT_NULL;
}
memcpy(tmp_path, path, path_len);
tmp_path[path_len] = '/';
memcpy(tmp_path + path_len + 1, link_fn, link_len);
tmp_path[path_len + 1 + link_len] = '\0';
fp = dfs_normalize_path(NULL, tmp_path);
rt_free(tmp_path);
return fp;
}
static int _insert_link_path(const char *link_fn, int link_len, char *tmp_path, int *index)
{
int ret = -1;
if (link_fn[0] != '/')
{
if (link_len + 1 <= *index)
{
*index -= link_len;
rt_memcpy(tmp_path + *index, link_fn, link_len);
*index -= 1;
tmp_path[*index] = '/';
ret = 0;
}
}
else if (link_len <= *index)
{
*index -= link_len;
rt_memcpy(tmp_path + *index, link_fn, link_len);
ret = 1;
}
return ret;
}
/*
* rw_verify_area doesn't like huge counts. We limit
* them to something that fits in "int" so that others
* won't have to do range checks all the time.
*/
ssize_t rw_verify_area(struct dfs_file *file, off_t *ppos, size_t count)
{
off_t pos;
ssize_t retval = -EINVAL;
if ((size_t)count < 0)
return retval;
pos = *ppos;
if (pos < 0)
{
if (count >= -pos) /* both values are in 0..LLONG_MAX */
return -EOVERFLOW;
}
return count > MAX_RW_COUNT ? MAX_RW_COUNT : count;
}
off_t dfs_file_get_fpos(struct dfs_file *file)
{
if (file)
{
if (file->vnode->type == FT_REGULAR)
{
rt_mutex_take(&file->pos_lock, RT_WAITING_FOREVER);
}
return file->fpos;
}
return 0;
}
void dfs_file_set_fpos(struct dfs_file *file, off_t fpos)
{
if (file)
{
if (file->vnode->type != FT_REGULAR)
{
rt_mutex_take(&file->pos_lock, RT_WAITING_FOREVER);
}
file->fpos = fpos;
rt_mutex_release(&file->pos_lock);
}
}
void dfs_file_init(struct dfs_file *file)
{
if (file)
{
rt_memset(file, 0x00, sizeof(struct dfs_file));
file->magic = DFS_FD_MAGIC;
rt_mutex_init(&file->pos_lock, "fpos", RT_IPC_FLAG_PRIO);
rt_atomic_store(&(file->ref_count), 1);
}
}
void dfs_file_deinit(struct dfs_file *file)
{
if (file)
{
rt_mutex_detach(&file->pos_lock);
}
}
static void dfs_file_unref(struct dfs_file *file)
{
rt_err_t ret = RT_EOK;
ret = dfs_file_lock();
if (ret == RT_EOK)
{
if (rt_atomic_load(&(file->ref_count)) == 1)
{
/* should release this file */
if (file->dentry)
{
DLOG(msg, "dfs_file", "dentry", DLOG_MSG, "dfs_dentry_unref(dentry(%s))", file->dentry->pathname);
dfs_dentry_unref(file->dentry);
file->dentry = RT_NULL;
}
else if (file->vnode)
{
if (file->vnode->ref_count > 1)
{
rt_atomic_sub(&(file->vnode->ref_count), 1);
}
else if (file->vnode->ref_count == 1)
{
rt_free(file->vnode);
file->vnode = RT_NULL;
}
}
LOG_I("release a file: %p", file);
}
dfs_file_unlock();
}
}
/*
* this function is creat a nolink path.
*
* @param mnt
* @param fullpath
* @param mode
*
* @return new path.
*/
char *dfs_file_realpath(struct dfs_mnt **mnt, const char *fullpath, int mode)
{
int path_len = 0, index = 0;
char *path = RT_NULL, *link_fn, *tmp_path;
struct dfs_mnt *tmp_mnt;
if (*mnt && fullpath)
{
int len, link_len;
path = (char *)rt_malloc((DFS_PATH_MAX * 3) + 3); // path + \0 + link_fn + \0 + tmp_path + \0
if (!path)
{
return RT_NULL;
}
link_fn = path + DFS_PATH_MAX + 1;
tmp_path = link_fn + (DFS_PATH_MAX + 1);
len = rt_strlen(fullpath);
if (len > DFS_PATH_MAX)
{
goto _ERR_RET;
}
index = (DFS_PATH_MAX - len);
rt_strcpy(tmp_path + index, fullpath);
if (mode == DFS_REALPATH_ONLY_LAST)
{
path_len = _get_parent_path(fullpath, path);
index += path_len;
}
while ((len = _first_path_len(tmp_path + index)) > 0)
{
if (len + path_len > DFS_PATH_MAX)
{
goto _ERR_RET;
}
rt_memcpy(path + path_len, tmp_path + index, len);
path[path_len + len] = '\0';
index += len;
tmp_mnt = dfs_mnt_lookup(path);
if (tmp_mnt == RT_NULL)
{
goto _ERR_RET;
}
*mnt = tmp_mnt;
/* the last should by mode process. */
if ((tmp_path[index] == '\0') && (mode == DFS_REALPATH_EXCEPT_LAST))
{
break;
}
link_len = _try_readlink(path, *mnt, link_fn);
if (link_len > 0)
{
if (link_fn[0] == '/')
{
int ret = _insert_link_path(link_fn, link_len, tmp_path, &index);
if (ret < 0)
{
goto _ERR_RET;
}
path_len = 0;
}
else
{
char *fp = _dfs_normalize_path(path, path_len, link_fn, link_len);
if (fp)
{
int pos = rt_strncmp(path, fp, path_len);
if (pos == 0)
{
int ret = _insert_link_path(fp + path_len, rt_strlen(fp + path_len), tmp_path, &index);
if (ret < 0)
{
rt_free(fp);
goto _ERR_RET;
}
}
else
{
int pos;
while(1)
{
while(path_len > 0 && path[path_len] != '/')
{
path_len--;
}
if (path_len > 0)
{
pos = rt_strncmp(path, fp, path_len);
}
else
{
pos = -1;
}
if (pos == 0 || path_len == 0)
{
int ret;
ret = _insert_link_path(fp + path_len, rt_strlen(fp + path_len), tmp_path, &index);
if (ret < 0)
{
rt_free(fp);
goto _ERR_RET;
}
else
{
break;
}
}
else
{
path_len--;
}
}
}
rt_free(fp);
}
}
}
else
{
path_len += len;
}
}
return path;
_ERR_RET:
rt_free(path);
path = RT_NULL;
}
return path;
}
/**
* this function will open a file which specified by path with specified oflags.
*
* @param fd the file descriptor pointer to return the corresponding result.
* @param path the specified file path.
* @param oflags the oflags for open operator.
*
* @return 0 on successful, -1 on failed.
*/
int dfs_file_open(struct dfs_file *file, const char *path, int oflags, mode_t mode)
{
int ret = -RT_ERROR;
char *fullpath = RT_NULL;
struct dfs_dentry *dentry = RT_NULL;
int fflags = dfs_fflags(oflags);
if (mode == 0)
{
mode = (S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); /* 0666 */
}
if (file && path)
{
fullpath = dfs_normalize_path(NULL, path);
if (fullpath)
{
struct dfs_mnt *mnt = RT_NULL;
DLOG(msg, "dfs_file", "mnt", DLOG_MSG, "dfs_mnt_lookup(%s)", fullpath);
mnt = dfs_mnt_lookup(fullpath);
if (mnt)
{
char *tmp = dfs_file_realpath(&mnt, fullpath, DFS_REALPATH_EXCEPT_LAST);
if (tmp)
{
rt_free(fullpath);
fullpath = tmp;
}
DLOG(msg, "dfs_file", "dentry", DLOG_MSG, "dfs_dentry_lookup(mnt, %s)", fullpath);
dentry = dfs_dentry_lookup(mnt, fullpath, oflags);
if (dentry && dentry->vnode->type == FT_SYMLINK)
{
/* it's a symbol link but not follow */
if (oflags & O_NOFOLLOW)
{
/* no follow symbol link */
dfs_dentry_unref(dentry);
dentry = RT_NULL;
}
else
{
struct dfs_dentry *target_dentry = RT_NULL;
char *path = dfs_file_realpath(&mnt, fullpath, DFS_REALPATH_ONLY_LAST);
if (path)
{
target_dentry = dfs_dentry_lookup(mnt, path, oflags);
rt_free(path);
}
dfs_dentry_unref(dentry);
dentry = target_dentry;
}
}
if (dentry)
{
if (oflags & O_DIRECTORY)
{
if (dentry->vnode->type != FT_DIRECTORY)
{
dfs_dentry_unref(dentry);
dentry = RT_NULL;
}
}
else if (dentry->vnode->type == FT_DIRECTORY)
{
if (fflags & (DFS_F_FWRITE))
{
dfs_dentry_unref(dentry);
dentry = RT_NULL;
}
else
{
oflags |= O_DIRECTORY;
}
}
}
if (oflags & O_CREAT)
{
if (dentry)
{
oflags &= ~O_CREAT;
if (oflags & O_EXCL)
{
oflags &= ~O_EXCL;
/* the dentry already exists */
dfs_dentry_unref(dentry);
ret = -EEXIST;
goto _ERR_RET;
}
}
else
{
/* create file/directory */
if (mnt->fs_ops->create_vnode)
{
struct dfs_vnode *vnode = RT_NULL;
DLOG(msg, "dfs_file", "dentry", DLOG_MSG, "dfs_dentry_create(%s)", fullpath);
dfs_file_lock();
dentry = dfs_dentry_create(mnt, fullpath);
if (dentry)
{
DLOG(msg, "dfs_file", mnt->fs_ops->name, DLOG_MSG, "fs_ops->create_vnode");
if (dfs_is_mounted(mnt) == 0)
{
vnode = mnt->fs_ops->create_vnode(dentry, oflags & O_DIRECTORY ? FT_DIRECTORY:FT_REGULAR, mode);
}
if (vnode)
{
/* set vnode */
dentry->vnode = vnode; /* the refcount of created vnode is 1. no need to reference */
dfs_dentry_insert(dentry);
}
else
{
DLOG(msg, mnt->fs_ops->name, "dfs_file", DLOG_MSG_RET, "create failed.");
dfs_dentry_unref(dentry);
dentry = RT_NULL;
}
}
dfs_file_unlock();
}
}
}
if (dentry)
{
rt_bool_t permission = RT_TRUE;
file->dentry = dentry;
file->vnode = dentry->vnode;
file->fops = dentry->mnt->fs_ops->default_fops;
file->flags = oflags;
/* check permission */
if (!(oflags & O_CREAT))
{
if (fflags & DFS_F_FWRITE)
{
if (!(file->vnode->mode & S_IWUSR))
{
permission = RT_FALSE;
}
}
if (fflags & DFS_F_FREAD)
{
if (!(file->vnode->mode & S_IRUSR))
{
permission = RT_FALSE;
}
}
if (oflags & O_EXEC)
{
if (!(file->vnode->mode & S_IXUSR))
{
permission = RT_FALSE;
}
}
}
if (permission && file->fops->open)
{
DLOG(msg, "dfs_file", mnt->fs_ops->name, DLOG_MSG, "fops->open(file)");
if (dfs_is_mounted(file->vnode->mnt) == 0)
{
dfs_file_lock();
ret = file->fops->open(file);
dfs_file_unlock();
}
else
{
ret = -EINVAL;
}
if (ret < 0)
{
LOG_I("open %s failed in file system: %s", path, dentry->mnt->fs_ops->name);
DLOG(msg, mnt->fs_ops->name, "dfs_file", DLOG_MSG_RET, "open failed.");
dfs_file_unref(file);
}
else
{
/* for char/block device */
if ((S_ISCHR(file->vnode->mode)) || (S_ISBLK(file->vnode->mode)))
{
file->fops = file->vnode->fops;
}
}
}
else
{
DLOG(msg, "dfs_file", mnt->fs_ops->name, DLOG_MSG, "no permission or fops->open");
dfs_file_unref(file);
ret = -EPERM;
}
}
else
{
LOG_I("lookup file:%s failed in file system", path);
ret = -ENOENT;
}
}
}
if (ret >= 0 && (oflags & O_TRUNC))
{
/* trunc file */
if (!(fflags & DFS_F_FWRITE) || file->vnode->type == FT_DIRECTORY)
{
/* truncate on read a only file or a directory */
DLOG(msg, "dfs_file", "dfs_file", DLOG_MSG, "dfs_file_unref(file), trunc on RDOnly or directory");
ret = -RT_ERROR;
}
else
{
if (file->fops->truncate)
{
DLOG(msg, "dfs_file", dentry->mnt->fs_ops->name, DLOG_MSG, "fops->truncate(file, 0)");
if (dfs_is_mounted(file->vnode->mnt) == 0)
{
#ifdef RT_USING_PAGECACHE
if (file->vnode->aspace)
{
dfs_aspace_clean(file->vnode->aspace);
}
#endif
ret = file->fops->truncate(file, 0);
}
else
{
ret = -EINVAL;
}
}
}
if (ret < 0)
{
dfs_file_unref(file);
}
file->flags &= ~O_TRUNC;
}
}
_ERR_RET:
if (fullpath != NULL)
{
rt_free(fullpath);
}
return ret;
}
int dfs_file_close(struct dfs_file *file)
{
int ret = -RT_ERROR;
if (file)
{
if (dfs_file_lock() == RT_EOK)
{
rt_atomic_t ref_count = rt_atomic_load(&(file->ref_count));
if (ref_count == 1 && file->fops && file->fops->close)
{
DLOG(msg, "dfs_file", file->dentry->mnt->fs_ops->name, DLOG_MSG, "fops->close(file)");
#ifdef RT_USING_PAGECACHE
if (file->vnode->aspace)
{
dfs_aspace_flush(file->vnode->aspace);
}
#endif
ret = file->fops->close(file);
if (ret == 0) /* close file sucessfully */
{
DLOG(msg, "dfs_file", "dfs_file", DLOG_MSG, "dfs_file_unref(file)");
dfs_file_unref(file);
}
else
{
LOG_W("close file:%s failed on low level file system", file->dentry->pathname);
}
}
else
{
DLOG(msg, "dfs_file", "dfs_file", DLOG_MSG, "dfs_file_unref(file)");
dfs_file_unref(file);
ret = 0;
}
dfs_file_unlock();
}
}
return ret;
}
ssize_t dfs_file_read(struct dfs_file *file, void *buf, size_t len)
{
ssize_t ret = -EBADF;
if (file)
{
/* check whether read */
if (!(dfs_fflags(file->flags) & DFS_F_FREAD))
{
ret = -EPERM;
}
else if (!file->fops || !file->fops->read)
{
ret = -ENOSYS;
}
else if (file->vnode && file->vnode->type != FT_DIRECTORY)
{
/* fpos lock */
off_t pos = dfs_file_get_fpos(file);
ret = rw_verify_area(file, &pos, len);
if (ret > 0)
{
len = ret;
if (dfs_is_mounted(file->vnode->mnt) == 0)
{
#ifdef RT_USING_PAGECACHE
if (file->vnode->aspace && !(file->flags & O_DIRECT))
{
ret = dfs_aspace_read(file, buf, len, &pos);
}
else
#endif
{
ret = file->fops->read(file, buf, len, &pos);
}
}
else
{
ret = -EINVAL;
}
}
/* fpos unlock */
dfs_file_set_fpos(file, pos);
}
}
return ret;
}
ssize_t dfs_file_write(struct dfs_file *file, const void *buf, size_t len)
{
size_t ret = -EBADF;
if (file)
{
if (!(dfs_fflags(file->flags) & DFS_F_FWRITE))
{
LOG_W("bad write flags.");
ret = -EBADF;
}
else if (!file->fops || !file->fops->write)
{
LOG_W("no fops write.");
ret = -ENOSYS;
}
else if (file->vnode && file->vnode->type != FT_DIRECTORY)
{
/* fpos lock */
off_t pos = dfs_file_get_fpos(file);
ret = rw_verify_area(file, &pos, len);
if (ret > 0)
{
len = ret;
DLOG(msg, "dfs_file", file->dentry->mnt->fs_ops->name, DLOG_MSG,
"dfs_file_write(fd, buf, %d)", len);
if (dfs_is_mounted(file->vnode->mnt) == 0)
{
#ifdef RT_USING_PAGECACHE
if (file->vnode->aspace && !(file->flags & O_DIRECT))
{
ret = dfs_aspace_write(file, buf, len, &pos);
}
else
#endif
{
ret = file->fops->write(file, buf, len, &pos);
}
if (file->flags & O_SYNC)
{
file->fops->flush(file);
}
}
else
{
ret = -EINVAL;
}
}
/* fpos unlock */
dfs_file_set_fpos(file, pos);
}
}
return ret;
}
off_t generic_dfs_lseek(struct dfs_file *file, off_t offset, int whence)
{
off_t foffset;
if (whence == SEEK_SET)
foffset = offset;
else if (whence == SEEK_CUR)
foffset = file->fpos + offset;
else if (whence == SEEK_END)
foffset = file->vnode->size + offset;
else
return -EINVAL;
return foffset;
}
off_t dfs_file_lseek(struct dfs_file *file, off_t offset, int wherece)
{
off_t retval = -EINVAL;
if (file && file->fops->lseek)
{
if (dfs_is_mounted(file->vnode->mnt) == 0)
{
/* fpos lock */
off_t pos = dfs_file_get_fpos(file);
retval = file->fops->lseek(file, offset, wherece);
if (retval >= 0)
{
pos = retval;
}
/* fpos unlock */
dfs_file_set_fpos(file, pos);
}
}
return retval;
}
int dfs_file_stat(const char *path, struct stat *buf)
{
int ret = -ENOENT;
char *fullpath = RT_NULL;
struct dfs_mnt *mnt = RT_NULL;
struct dfs_dentry *dentry = RT_NULL;
fullpath = dfs_normalize_path(NULL, path);
if (fullpath)
{
DLOG(msg, "dfs_file", "mnt", DLOG_MSG, "dfs_mnt_lookup(%s)", fullpath);
mnt = dfs_mnt_lookup(fullpath);
if (mnt)
{
char *tmp = dfs_file_realpath(&mnt, fullpath, DFS_REALPATH_EXCEPT_NONE);
if (tmp)
{
rt_free(fullpath);
fullpath = tmp;
}
DLOG(msg, "dfs_file", "dentry", DLOG_MSG, "dentry = dfs_dentry_lookup(mnt, %s)", fullpath);
dentry = dfs_dentry_lookup(mnt, fullpath, 0);
if (dentry)
{
DLOG(msg, "dentry", "dfs_file", DLOG_MSG_RET, "return dentry");
if (mnt->fs_ops->stat)
{
DLOG(msg, "dfs_file", mnt->fs_ops->name, DLOG_MSG, "fs_ops->stat(dentry, buf)");
if (dfs_is_mounted(mnt) == 0)
{
ret = mnt->fs_ops->stat(dentry, buf);
}
}
/* unref dentry */
DLOG(msg, "dfs_file", "dentry", DLOG_MSG, "dfs_dentry_unref(dentry)");
dfs_dentry_unref(dentry);
dentry = RT_NULL;
}
}
rt_free(fullpath);
fullpath = RT_NULL;
}
else
{
ret = -ENOMEM;
}
return ret;
}
int dfs_file_lstat(const char *path, struct stat *buf)
{
int ret = -ENOENT;
char *fullpath = RT_NULL;
struct dfs_mnt *mnt = RT_NULL;
struct dfs_dentry *dentry = RT_NULL;
fullpath = dfs_normalize_path(NULL, path);
if (fullpath)
{
DLOG(msg, "dfs_file", "mnt", DLOG_MSG, "dfs_mnt_lookup(%s)", fullpath);
mnt = dfs_mnt_lookup(fullpath);
if (mnt)
{
char *tmp = dfs_file_realpath(&mnt, fullpath, DFS_REALPATH_EXCEPT_LAST);
if (tmp)
{
rt_free(fullpath);
fullpath = tmp;
}
DLOG(msg, "dfs_file", "dentry", DLOG_MSG, "dentry = dfs_dentry_lookup(mnt, %s)", fullpath);
dentry = dfs_dentry_lookup(mnt, fullpath, 0);
if (dentry)
{
DLOG(msg, "dentry", "dfs_file", DLOG_MSG_RET, "return dentry");
if (mnt->fs_ops->stat)
{
DLOG(msg, "dfs_file", mnt->fs_ops->name, DLOG_MSG, "fs_ops->stat(dentry, buf)");
if (dfs_is_mounted(mnt) == 0)
{
ret = mnt->fs_ops->stat(dentry, buf);
}
}
/* unref dentry */
DLOG(msg, "dfs_file", "dentry", DLOG_MSG, "dfs_dentry_unref(dentry)");
dfs_dentry_unref(dentry);
dentry = RT_NULL;
}
}
rt_free(fullpath);
fullpath = RT_NULL;
}
else
{
ret = -ENOMEM;
}
rt_set_errno(-ret);
return ret;
}
int dfs_file_fstat(struct dfs_file *file, struct stat *buf)
{
size_t ret = -EBADF;
if (file)
{
if (file->fops && file->fops->ioctl)
{
// ret = file->fops->fstat(file, buf);
}
else
{
ret = -ENOSYS;
}
}
else
{
ret = -EBADF;
}
return ret;
}
int dfs_file_setattr(const char *path, struct dfs_attr *attr)
{
int ret = -RT_ERROR;
char *fullpath = RT_NULL;
struct dfs_mnt *mnt = RT_NULL;