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feat(storage/vfs): make automatic nullfs initialization optional

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This commit is contained in:
Tomáš Rohlínek 2024-05-09 15:31:51 +02:00
parent f2a278191b
commit 97af825b14
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GPG Key ID: BDE1CEDD10F7E372
2 changed files with 26 additions and 9 deletions
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7
components/vfs/Kconfig
View File

@ -97,4 +97,11 @@ menu "Virtual file system"
Define maximum number of host filesystem mount points.
endmenu
config VFS_INITIALIZE_DEV_NULL
bool "Initialize /dev/null VFS"
default y
depends on VFS_SUPPORT_IO
help
If enabled, /dev/null VFS will be automatically initialized at startup.
endmenu

28
components/vfs/nullfs.c
View File

@ -3,6 +3,7 @@
*
* SPDX-License-Identifier: Apache-2.0
*/
#include "sdkconfig.h"
#include <stdio.h>
#include <sys/types.h>
#include <stddef.h>
@ -16,6 +17,7 @@
#include <fcntl.h>
#include "esp_vfs.h"
#include "esp_log.h"
#include "esp_err.h"
#include "esp_private/startup_internal.h"
#include "esp_vfs_null.h"
@ -27,7 +29,8 @@ typedef enum {
VFS_NULL_WRITE = 1 << 1,
} vfs_null_flags_t;
typedef uint64_t vfs_null_ctx_t;
typedef uint32_t vfs_null_ctx_t;
#define VFS_NULL_MAX_FDS (sizeof(vfs_null_ctx_t) * 4)
#define GET_FLAGS(ctx, fd) ((ctx >> (fd * 2)) & 0x3)
#define SET_FLAGS(ctx, fd, flags) (ctx |= (flags << (fd * 2)))
@ -38,12 +41,17 @@ typedef uint64_t vfs_null_ctx_t;
#define SET_WRITABLE(ctx, fd) SET_FLAGS(ctx, fd, VFS_NULL_WRITE)
#define SET_READABLE(ctx, fd) SET_FLAGS(ctx, fd, VFS_NULL_READ)
#define FD_IN_RANGE(fd) (fd >= 0 && fd < 32)
#define FD_IN_RANGE(fd) (fd >= 0 && fd < VFS_NULL_MAX_FDS)
#define IS_FD_VALID(fd) (FD_IN_RANGE(fd) && GET_FLAGS(g_fds, fd) != VFS_NULL_CLOSED)
static vfs_null_ctx_t g_fds = 0;
#ifdef CONFIG_ESP_CONSOLE_NONE // Prevents recursive logging
static const char* TAG = "nullfs";
#define NULLFS_LOGD(TAG, fmt, ...) ESP_LOGD(TAG, fmt, ##__VA_ARGS__)
#else
#define NULLFS_LOGD(TAG, fmt, ...)
#endif
static vfs_null_ctx_t g_fds = 0;
static ssize_t vfs_null_write(int fd, const void *data, size_t size);
static off_t vfs_null_lseek(int fd, off_t offset, int whence);
@ -124,7 +132,7 @@ static ssize_t vfs_null_read(int fd, void *data, size_t size)
{
UNUSED(data);
ESP_LOGD(TAG, "read %u bytes", size);
NULLFS_LOGD(TAG, "read %u bytes", size);
if (FD_IN_RANGE(fd) && READABLE(g_fds, fd)) {
return 0; // EOF
@ -140,7 +148,7 @@ static int vfs_null_pread(int fd, void *data, size_t size, off_t offset)
UNUSED(size);
UNUSED(offset);
ESP_LOGD(TAG, "pread %u bytes at offset %ld", size, offset);
NULLFS_LOGD(TAG, "pread %u bytes at offset %ld", size, offset);
if (!FD_IN_RANGE(fd) || !READABLE(g_fds, fd)) {
errno = EBADF;
@ -156,7 +164,7 @@ static int vfs_null_pwrite(int fd, const void *data, size_t size, off_t offset)
UNUSED(data);
UNUSED(offset);
ESP_LOGD(TAG, "pwrite %u bytes at offset %ld", size, offset);
NULLFS_LOGD(TAG, "pwrite %u bytes at offset %ld", size, offset);
if (!FD_IN_RANGE(fd) || !WRITABLE(g_fds, fd)) {
errno = EBADF;
@ -168,7 +176,7 @@ static int vfs_null_pwrite(int fd, const void *data, size_t size, off_t offset)
static int vfs_null_get_empty_fd(void)
{
for (int i = 0; i < 32; i++) {
for (int i = 0; i < VFS_NULL_MAX_FDS; i++) {
if (GET_FLAGS(g_fds, i) == VFS_NULL_CLOSED) {
return i;
}
@ -181,7 +189,7 @@ static int vfs_null_open(const char* path, int flags, int mode)
{
UNUSED(mode);
ESP_LOGD(TAG, "open %s, flags %d", path, flags);
NULLFS_LOGD(TAG, "open %s, flags %d", path, flags);
// Possibly check if the flags are valid
@ -302,10 +310,12 @@ static int vfs_null_fsync(int fd)
return 0;
}
#if defined(CONFIG_VFS_INITIALIZE_DEV_NULL) || defined(CONFIG_ESP_CONSOLE_NONE)
ESP_SYSTEM_INIT_FN(init_vfs_nullfs, CORE, BIT(0), 113)
{
return esp_vfs_null_register();
}
#endif // CONFIG_VFS_INITIALIZE_DEV_NULL
void esp_vfs_include_nullfs_register(void)
{