blob: f8460dc3cb67515f43180484ba294d7ee893d72a [file] [log] [blame]
/*
* Copyright (c) 2018 Intel Corporation.
* Copyright (c) 2020 Peter Bigot Consulting, LLC
* Copyright (c) 2020 Nordic Semiconductor ASA
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <stdio.h>
#include <string.h>
#include <zephyr/types.h>
#include <errno.h>
#include <zephyr/init.h>
#include <zephyr/kernel.h>
#include <zephyr/fs/fs.h>
#include <zephyr/fs/fs_sys.h>
#include <zephyr/sys/check.h>
#define LOG_LEVEL CONFIG_FS_LOG_LEVEL
#include <zephyr/logging/log.h>
LOG_MODULE_REGISTER(fs);
/* list of mounted file systems */
static sys_dlist_t fs_mnt_list;
/* lock to protect mount list operations */
static struct k_mutex mutex;
/* Maps an identifier used in mount points to the file system
* implementation.
*/
struct registry_entry {
int type;
const struct fs_file_system_t *fstp;
};
static struct registry_entry registry[CONFIG_FILE_SYSTEM_MAX_TYPES];
static inline void registry_clear_entry(struct registry_entry *ep)
{
ep->fstp = NULL;
}
static int registry_add(int type,
const struct fs_file_system_t *fstp)
{
int rv = -ENOSPC;
for (size_t i = 0; i < ARRAY_SIZE(registry); ++i) {
struct registry_entry *ep = &registry[i];
if (ep->fstp == NULL) {
ep->type = type;
ep->fstp = fstp;
rv = 0;
break;
}
}
return rv;
}
static struct registry_entry *registry_find(int type)
{
for (size_t i = 0; i < ARRAY_SIZE(registry); ++i) {
struct registry_entry *ep = &registry[i];
if ((ep->fstp != NULL) && (ep->type == type)) {
return ep;
}
}
return NULL;
}
static const struct fs_file_system_t *fs_type_get(int type)
{
struct registry_entry *ep = registry_find(type);
return (ep != NULL) ? ep->fstp : NULL;
}
static int fs_get_mnt_point(struct fs_mount_t **mnt_pntp,
const char *name, size_t *match_len)
{
struct fs_mount_t *mnt_p = NULL, *itr;
size_t longest_match = 0;
size_t len, name_len = strlen(name);
sys_dnode_t *node;
k_mutex_lock(&mutex, K_FOREVER);
SYS_DLIST_FOR_EACH_NODE(&fs_mnt_list, node) {
itr = CONTAINER_OF(node, struct fs_mount_t, node);
len = itr->mountp_len;
/*
* Move to next node if mount point length is
* shorter than longest_match match or if path
* name is shorter than the mount point name.
*/
if ((len < longest_match) || (len > name_len)) {
continue;
}
/*
* Move to next node if name does not have a directory
* separator where mount point name ends.
*/
if ((len > 1) && (name[len] != '/') && (name[len] != '\0')) {
continue;
}
/* Check for mount point match */
if (strncmp(name, itr->mnt_point, len) == 0) {
mnt_p = itr;
longest_match = len;
}
}
k_mutex_unlock(&mutex);
if (mnt_p == NULL) {
return -ENOENT;
}
*mnt_pntp = mnt_p;
if (match_len) {
*match_len = mnt_p->mountp_len;
}
return 0;
}
/* File operations */
int fs_open(struct fs_file_t *zfp, const char *file_name, fs_mode_t flags)
{
struct fs_mount_t *mp;
int rc = -EINVAL;
if ((file_name == NULL) ||
(strlen(file_name) <= 1) || (file_name[0] != '/')) {
LOG_ERR("invalid file name!!");
return -EINVAL;
}
if (zfp->mp != NULL) {
return -EBUSY;
}
rc = fs_get_mnt_point(&mp, file_name, NULL);
if (rc < 0) {
LOG_ERR("mount point not found!!");
return rc;
}
if (((mp->flags & FS_MOUNT_FLAG_READ_ONLY) != 0) &&
(flags & FS_O_CREATE || flags & FS_O_WRITE)) {
return -EROFS;
}
CHECKIF(mp->fs->open == NULL) {
return -ENOTSUP;
}
zfp->mp = mp;
rc = mp->fs->open(zfp, file_name, flags);
if (rc < 0) {
LOG_ERR("file open error (%d)", rc);
zfp->mp = NULL;
return rc;
}
/* Copy flags to zfp for use with other fs_ API calls */
zfp->flags = flags;
return rc;
}
int fs_close(struct fs_file_t *zfp)
{
int rc = -EINVAL;
if (zfp->mp == NULL) {
return 0;
}
CHECKIF(zfp->mp->fs->close == NULL) {
return -ENOTSUP;
}
rc = zfp->mp->fs->close(zfp);
if (rc < 0) {
LOG_ERR("file close error (%d)", rc);
return rc;
}
zfp->mp = NULL;
return rc;
}
ssize_t fs_read(struct fs_file_t *zfp, void *ptr, size_t size)
{
int rc = -EINVAL;
if (zfp->mp == NULL) {
return -EBADF;
}
CHECKIF(zfp->mp->fs->read == NULL) {
return -ENOTSUP;
}
rc = zfp->mp->fs->read(zfp, ptr, size);
if (rc < 0) {
LOG_ERR("file read error (%d)", rc);
}
return rc;
}
ssize_t fs_write(struct fs_file_t *zfp, const void *ptr, size_t size)
{
int rc = -EINVAL;
if (zfp->mp == NULL) {
return -EBADF;
}
CHECKIF(zfp->mp->fs->write == NULL) {
return -ENOTSUP;
}
rc = zfp->mp->fs->write(zfp, ptr, size);
if (rc < 0) {
LOG_ERR("file write error (%d)", rc);
}
return rc;
}
int fs_seek(struct fs_file_t *zfp, off_t offset, int whence)
{
int rc = -ENOTSUP;
if (zfp->mp == NULL) {
return -EBADF;
}
CHECKIF(zfp->mp->fs->lseek == NULL) {
return -ENOTSUP;
}
rc = zfp->mp->fs->lseek(zfp, offset, whence);
if (rc < 0) {
LOG_ERR("file seek error (%d)", rc);
}
return rc;
}
off_t fs_tell(struct fs_file_t *zfp)
{
int rc = -ENOTSUP;
if (zfp->mp == NULL) {
return -EBADF;
}
CHECKIF(zfp->mp->fs->tell == NULL) {
return -ENOTSUP;
}
rc = zfp->mp->fs->tell(zfp);
if (rc < 0) {
LOG_ERR("file tell error (%d)", rc);
}
return rc;
}
int fs_truncate(struct fs_file_t *zfp, off_t length)
{
int rc = -EINVAL;
if (zfp->mp == NULL) {
return -EBADF;
}
CHECKIF(zfp->mp->fs->truncate == NULL) {
return -ENOTSUP;
}
rc = zfp->mp->fs->truncate(zfp, length);
if (rc < 0) {
LOG_ERR("file truncate error (%d)", rc);
}
return rc;
}
int fs_sync(struct fs_file_t *zfp)
{
int rc = -EINVAL;
if (zfp->mp == NULL) {
return -EBADF;
}
CHECKIF(zfp->mp->fs->sync == NULL) {
return -ENOTSUP;
}
rc = zfp->mp->fs->sync(zfp);
if (rc < 0) {
LOG_ERR("file sync error (%d)", rc);
}
return rc;
}
/* Directory operations */
int fs_opendir(struct fs_dir_t *zdp, const char *abs_path)
{
struct fs_mount_t *mp;
int rc = -EINVAL;
if ((abs_path == NULL) ||
(strlen(abs_path) < 1) || (abs_path[0] != '/')) {
LOG_ERR("invalid directory name!!");
return -EINVAL;
}
if (zdp->mp != NULL || zdp->dirp != NULL) {
return -EBUSY;
}
if (strcmp(abs_path, "/") == 0) {
/* Open VFS root dir, marked by zdp->mp == NULL */
k_mutex_lock(&mutex, K_FOREVER);
zdp->mp = NULL;
zdp->dirp = sys_dlist_peek_head(&fs_mnt_list);
k_mutex_unlock(&mutex);
return 0;
}
rc = fs_get_mnt_point(&mp, abs_path, NULL);
if (rc < 0) {
LOG_ERR("mount point not found!!");
return rc;
}
CHECKIF(mp->fs->opendir == NULL) {
return -ENOTSUP;
}
zdp->mp = mp;
rc = zdp->mp->fs->opendir(zdp, abs_path);
if (rc < 0) {
zdp->mp = NULL;
zdp->dirp = NULL;
LOG_ERR("directory open error (%d)", rc);
}
return rc;
}
int fs_readdir(struct fs_dir_t *zdp, struct fs_dirent *entry)
{
if (zdp->mp) {
/* Delegate to mounted filesystem */
int rc = -EINVAL;
CHECKIF(zdp->mp->fs->readdir == NULL) {
return -ENOTSUP;
}
/* Loop until error or not special directory */
while (true) {
rc = zdp->mp->fs->readdir(zdp, entry);
if (rc < 0) {
break;
}
if (entry->name[0] == 0) {
break;
}
if (entry->type != FS_DIR_ENTRY_DIR) {
break;
}
if ((strcmp(entry->name, ".") != 0)
&& (strcmp(entry->name, "..") != 0)) {
break;
}
}
if (rc < 0) {
LOG_ERR("directory read error (%d)", rc);
}
return rc;
}
/* VFS root dir */
if (zdp->dirp == NULL) {
/* No more entries */
entry->name[0] = 0;
return 0;
}
/* Find the current and next entries in the mount point dlist */
sys_dnode_t *node, *next = NULL;
bool found = false;
k_mutex_lock(&mutex, K_FOREVER);
SYS_DLIST_FOR_EACH_NODE(&fs_mnt_list, node) {
if (node == zdp->dirp) {
found = true;
/* Pull info from current entry */
struct fs_mount_t *mnt;
mnt = CONTAINER_OF(node, struct fs_mount_t, node);
entry->type = FS_DIR_ENTRY_DIR;
strncpy(entry->name, mnt->mnt_point + 1,
sizeof(entry->name) - 1);
entry->name[sizeof(entry->name) - 1] = 0;
entry->size = 0;
/* Save pointer to the next one, for later */
next = sys_dlist_peek_next(&fs_mnt_list, node);
break;
}
}
k_mutex_unlock(&mutex);
if (!found) {
/* Current entry must have been removed before this
* call to readdir -- return an error
*/
return -ENOENT;
}
zdp->dirp = next;
return 0;
}
int fs_closedir(struct fs_dir_t *zdp)
{
int rc = -EINVAL;
if (zdp->mp == NULL) {
/* VFS root dir */
zdp->dirp = NULL;
return 0;
}
CHECKIF(zdp->mp->fs->closedir == NULL) {
return -ENOTSUP;
}
rc = zdp->mp->fs->closedir(zdp);
if (rc < 0) {
LOG_ERR("directory close error (%d)", rc);
return rc;
}
zdp->mp = NULL;
zdp->dirp = NULL;
return rc;
}
/* Filesystem operations */
int fs_mkdir(const char *abs_path)
{
struct fs_mount_t *mp;
int rc = -EINVAL;
if ((abs_path == NULL) ||
(strlen(abs_path) <= 1) || (abs_path[0] != '/')) {
LOG_ERR("invalid directory name!!");
return -EINVAL;
}
rc = fs_get_mnt_point(&mp, abs_path, NULL);
if (rc < 0) {
LOG_ERR("mount point not found!!");
return rc;
}
if (mp->flags & FS_MOUNT_FLAG_READ_ONLY) {
return -EROFS;
}
CHECKIF(mp->fs->mkdir == NULL) {
return -ENOTSUP;
}
rc = mp->fs->mkdir(mp, abs_path);
if (rc < 0) {
LOG_ERR("failed to create directory (%d)", rc);
}
return rc;
}
int fs_unlink(const char *abs_path)
{
struct fs_mount_t *mp;
int rc = -EINVAL;
if ((abs_path == NULL) ||
(strlen(abs_path) <= 1) || (abs_path[0] != '/')) {
LOG_ERR("invalid file name!!");
return -EINVAL;
}
rc = fs_get_mnt_point(&mp, abs_path, NULL);
if (rc < 0) {
LOG_ERR("mount point not found!!");
return rc;
}
if (mp->flags & FS_MOUNT_FLAG_READ_ONLY) {
return -EROFS;
}
CHECKIF(mp->fs->unlink == NULL) {
return -ENOTSUP;
}
rc = mp->fs->unlink(mp, abs_path);
if (rc < 0) {
LOG_ERR("failed to unlink path (%d)", rc);
}
return rc;
}
int fs_rename(const char *from, const char *to)
{
struct fs_mount_t *mp;
size_t match_len;
int rc = -EINVAL;
if ((from == NULL) || (strlen(from) <= 1) || (from[0] != '/') ||
(to == NULL) || (strlen(to) <= 1) || (to[0] != '/')) {
LOG_ERR("invalid file name!!");
return -EINVAL;
}
rc = fs_get_mnt_point(&mp, from, &match_len);
if (rc < 0) {
LOG_ERR("mount point not found!!");
return rc;
}
if (mp->flags & FS_MOUNT_FLAG_READ_ONLY) {
return -EROFS;
}
/* Make sure both files are mounted on the same path */
if (strncmp(from, to, match_len) != 0) {
LOG_ERR("mount point not same!!");
return -EINVAL;
}
CHECKIF(mp->fs->rename == NULL) {
return -ENOTSUP;
}
rc = mp->fs->rename(mp, from, to);
if (rc < 0) {
LOG_ERR("failed to rename file or dir (%d)", rc);
}
return rc;
}
int fs_stat(const char *abs_path, struct fs_dirent *entry)
{
struct fs_mount_t *mp;
int rc = -EINVAL;
if ((abs_path == NULL) ||
(strlen(abs_path) <= 1) || (abs_path[0] != '/')) {
LOG_ERR("invalid file or dir name!!");
return -EINVAL;
}
rc = fs_get_mnt_point(&mp, abs_path, NULL);
if (rc < 0) {
LOG_ERR("mount point not found!!");
return rc;
}
CHECKIF(mp->fs->stat == NULL) {
return -ENOTSUP;
}
rc = mp->fs->stat(mp, abs_path, entry);
if (rc == -ENOENT) {
/* File doesn't exist, which is a valid stat response */
} else if (rc < 0) {
LOG_ERR("failed get file or dir stat (%d)", rc);
}
return rc;
}
int fs_statvfs(const char *abs_path, struct fs_statvfs *stat)
{
struct fs_mount_t *mp;
int rc;
if ((abs_path == NULL) ||
(strlen(abs_path) <= 1) || (abs_path[0] != '/')) {
LOG_ERR("invalid file or dir name!!");
return -EINVAL;
}
rc = fs_get_mnt_point(&mp, abs_path, NULL);
if (rc < 0) {
LOG_ERR("mount point not found!!");
return rc;
}
CHECKIF(mp->fs->statvfs == NULL) {
return -ENOTSUP;
}
rc = mp->fs->statvfs(mp, abs_path, stat);
if (rc < 0) {
LOG_ERR("failed get file or dir stat (%d)", rc);
}
return rc;
}
int fs_mount(struct fs_mount_t *mp)
{
struct fs_mount_t *itr;
const struct fs_file_system_t *fs;
sys_dnode_t *node;
int rc = -EINVAL;
size_t len = 0;
/* Do all the mp checks prior to locking the mutex on the file
* subsystem.
*/
if ((mp == NULL) || (mp->mnt_point == NULL)) {
LOG_ERR("mount point not initialized!!");
return -EINVAL;
}
if (sys_dnode_is_linked(&mp->node)) {
LOG_ERR("file system already mounted!!");
return -EBUSY;
}
len = strlen(mp->mnt_point);
if ((len <= 1) || (mp->mnt_point[0] != '/')) {
LOG_ERR("invalid mount point!!");
return -EINVAL;
}
k_mutex_lock(&mutex, K_FOREVER);
/* Check if mount point already exists */
SYS_DLIST_FOR_EACH_NODE(&fs_mnt_list, node) {
itr = CONTAINER_OF(node, struct fs_mount_t, node);
/* continue if length does not match */
if (len != itr->mountp_len) {
continue;
}
if (strncmp(mp->mnt_point, itr->mnt_point, len) == 0) {
LOG_ERR("mount point already exists!!");
rc = -EBUSY;
goto mount_err;
}
}
/* Get file system information */
fs = fs_type_get(mp->type);
if (fs == NULL) {
LOG_ERR("requested file system type not registered!!");
rc = -ENOENT;
goto mount_err;
}
CHECKIF(fs->mount == NULL) {
LOG_ERR("fs type %d does not support mounting", mp->type);
rc = -ENOTSUP;
goto mount_err;
}
if (fs->unmount == NULL) {
LOG_WRN("mount path %s is not unmountable",
mp->mnt_point);
}
rc = fs->mount(mp);
if (rc < 0) {
LOG_ERR("fs mount error (%d)", rc);
goto mount_err;
}
/* Update mount point data and append it to the list */
mp->mountp_len = len;
mp->fs = fs;
sys_dlist_append(&fs_mnt_list, &mp->node);
LOG_DBG("fs mounted at %s", mp->mnt_point);
mount_err:
k_mutex_unlock(&mutex);
return rc;
}
#if defined(CONFIG_FILE_SYSTEM_MKFS)
int fs_mkfs(int fs_type, uintptr_t dev_id, void *cfg, int flags)
{
int rc = -EINVAL;
const struct fs_file_system_t *fs;
k_mutex_lock(&mutex, K_FOREVER);
/* Get file system information */
fs = fs_type_get(fs_type);
if (fs == NULL) {
LOG_ERR("fs type %d not registered!!",
fs_type);
rc = -ENOENT;
goto mount_err;
}
CHECKIF(fs->mkfs == NULL) {
LOG_ERR("fs type %d does not support mkfs", fs_type);
rc = -ENOTSUP;
goto mount_err;
}
rc = fs->mkfs(dev_id, cfg, flags);
if (rc < 0) {
LOG_ERR("mkfs error (%d)", rc);
goto mount_err;
}
mount_err:
k_mutex_unlock(&mutex);
return rc;
}
#endif /* CONFIG_FILE_SYSTEM_MKFS */
int fs_unmount(struct fs_mount_t *mp)
{
int rc = -EINVAL;
if (mp == NULL) {
return rc;
}
k_mutex_lock(&mutex, K_FOREVER);
if (!sys_dnode_is_linked(&mp->node)) {
LOG_ERR("fs not mounted (mp == %p)", mp);
goto unmount_err;
}
CHECKIF(mp->fs->unmount == NULL) {
LOG_ERR("fs unmount not supported!!");
rc = -ENOTSUP;
goto unmount_err;
}
rc = mp->fs->unmount(mp);
if (rc < 0) {
LOG_ERR("fs unmount error (%d)", rc);
goto unmount_err;
}
/* clear file system interface */
mp->fs = NULL;
/* remove mount node from the list */
sys_dlist_remove(&mp->node);
LOG_DBG("fs unmounted from %s", mp->mnt_point);
unmount_err:
k_mutex_unlock(&mutex);
return rc;
}
int fs_readmount(int *index, const char **name)
{
sys_dnode_t *node;
int rc = -ENOENT;
int cnt = 0;
struct fs_mount_t *itr = NULL;
*name = NULL;
k_mutex_lock(&mutex, K_FOREVER);
SYS_DLIST_FOR_EACH_NODE(&fs_mnt_list, node) {
if (*index == cnt) {
itr = CONTAINER_OF(node, struct fs_mount_t, node);
break;
}
++cnt;
}
k_mutex_unlock(&mutex);
if (itr != NULL) {
rc = 0;
*name = itr->mnt_point;
++(*index);
}
return rc;
}
/* Register File system */
int fs_register(int type, const struct fs_file_system_t *fs)
{
int rc = 0;
k_mutex_lock(&mutex, K_FOREVER);
if (fs_type_get(type) != NULL) {
rc = -EALREADY;
} else {
rc = registry_add(type, fs);
}
k_mutex_unlock(&mutex);
LOG_DBG("fs register %d: %d", type, rc);
return rc;
}
/* Unregister File system */
int fs_unregister(int type, const struct fs_file_system_t *fs)
{
int rc = 0;
struct registry_entry *ep;
k_mutex_lock(&mutex, K_FOREVER);
ep = registry_find(type);
if ((ep == NULL) || (ep->fstp != fs)) {
rc = -EINVAL;
} else {
registry_clear_entry(ep);
}
k_mutex_unlock(&mutex);
LOG_DBG("fs unregister %d: %d", type, rc);
return rc;
}
static int fs_init(const struct device *dev)
{
k_mutex_init(&mutex);
sys_dlist_init(&fs_mnt_list);
return 0;
}
SYS_INIT(fs_init, POST_KERNEL, CONFIG_KERNEL_INIT_PRIORITY_DEFAULT);