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- // SPDX-License-Identifier: GPL-2.0+
- /*
- * EFI_FILE_PROTOCOL
- *
- * Copyright (c) 2017 Rob Clark
- */
- #include <common.h>
- #include <charset.h>
- #include <efi_loader.h>
- #include <log.h>
- #include <malloc.h>
- #include <mapmem.h>
- #include <fs.h>
- #include <part.h>
- /* GUID for file system information */
- const efi_guid_t efi_file_system_info_guid = EFI_FILE_SYSTEM_INFO_GUID;
- /* GUID to obtain the volume label */
- const efi_guid_t efi_system_volume_label_id = EFI_FILE_SYSTEM_VOLUME_LABEL_ID;
- struct file_system {
- struct efi_simple_file_system_protocol base;
- struct efi_device_path *dp;
- struct blk_desc *desc;
- int part;
- };
- #define to_fs(x) container_of(x, struct file_system, base)
- struct file_handle {
- struct efi_file_handle base;
- struct file_system *fs;
- loff_t offset; /* current file position/cursor */
- int isdir;
- u64 open_mode;
- /* for reading a directory: */
- struct fs_dir_stream *dirs;
- struct fs_dirent *dent;
- char path[0];
- };
- #define to_fh(x) container_of(x, struct file_handle, base)
- static const struct efi_file_handle efi_file_handle_protocol;
- static char *basename(struct file_handle *fh)
- {
- char *s = strrchr(fh->path, '/');
- if (s)
- return s + 1;
- return fh->path;
- }
- static int set_blk_dev(struct file_handle *fh)
- {
- return fs_set_blk_dev_with_part(fh->fs->desc, fh->fs->part);
- }
- /**
- * is_dir() - check if file handle points to directory
- *
- * We assume that set_blk_dev(fh) has been called already.
- *
- * @fh: file handle
- * Return: true if file handle points to a directory
- */
- static int is_dir(struct file_handle *fh)
- {
- struct fs_dir_stream *dirs;
- dirs = fs_opendir(fh->path);
- if (!dirs)
- return 0;
- fs_closedir(dirs);
- return 1;
- }
- /*
- * Normalize a path which may include either back or fwd slashes,
- * double slashes, . or .. entries in the path, etc.
- */
- static int sanitize_path(char *path)
- {
- char *p;
- /* backslash to slash: */
- p = path;
- while ((p = strchr(p, '\\')))
- *p++ = '/';
- /* handle double-slashes: */
- p = path;
- while ((p = strstr(p, "//"))) {
- char *src = p + 1;
- memmove(p, src, strlen(src) + 1);
- }
- /* handle extra /.'s */
- p = path;
- while ((p = strstr(p, "/."))) {
- /*
- * You'd be tempted to do this *after* handling ".."s
- * below to avoid having to check if "/." is start of
- * a "/..", but that won't have the correct results..
- * for example, "/foo/./../bar" would get resolved to
- * "/foo/bar" if you did these two passes in the other
- * order
- */
- if (p[2] == '.') {
- p += 2;
- continue;
- }
- char *src = p + 2;
- memmove(p, src, strlen(src) + 1);
- }
- /* handle extra /..'s: */
- p = path;
- while ((p = strstr(p, "/.."))) {
- char *src = p + 3;
- p--;
- /* find beginning of previous path entry: */
- while (true) {
- if (p < path)
- return -1;
- if (*p == '/')
- break;
- p--;
- }
- memmove(p, src, strlen(src) + 1);
- }
- return 0;
- }
- /**
- * efi_create_file() - create file or directory
- *
- * @fh: file handle
- * @attributes: attributes for newly created file
- * Returns: 0 for success
- */
- static int efi_create_file(struct file_handle *fh, u64 attributes)
- {
- loff_t actwrite;
- void *buffer = &actwrite;
- if (attributes & EFI_FILE_DIRECTORY)
- return fs_mkdir(fh->path);
- else
- return fs_write(fh->path, map_to_sysmem(buffer), 0, 0,
- &actwrite);
- }
- /**
- * file_open() - open a file handle
- *
- * @fs: file system
- * @parent: directory relative to which the file is to be opened
- * @file_name: path of the file to be opened. '\', '.', or '..' may
- * be used as modifiers. A leading backslash indicates an
- * absolute path.
- * @open_mode: bit mask indicating the access mode (read, write,
- * create)
- * @attributes: attributes for newly created file
- * Returns: handle to the opened file or NULL
- */
- static struct efi_file_handle *file_open(struct file_system *fs,
- struct file_handle *parent, u16 *file_name, u64 open_mode,
- u64 attributes)
- {
- struct file_handle *fh;
- char f0[MAX_UTF8_PER_UTF16] = {0};
- int plen = 0;
- int flen = 0;
- if (file_name) {
- utf16_to_utf8((u8 *)f0, file_name, 1);
- flen = u16_strlen(file_name);
- }
- /* we could have a parent, but also an absolute path: */
- if (f0[0] == '\\') {
- plen = 0;
- } else if (parent) {
- plen = strlen(parent->path) + 1;
- }
- /* +2 is for null and '/' */
- fh = calloc(1, sizeof(*fh) + plen + (flen * MAX_UTF8_PER_UTF16) + 2);
- fh->open_mode = open_mode;
- fh->base = efi_file_handle_protocol;
- fh->fs = fs;
- if (parent) {
- char *p = fh->path;
- int exists;
- if (plen > 0) {
- strcpy(p, parent->path);
- p += plen - 1;
- *p++ = '/';
- }
- utf16_to_utf8((u8 *)p, file_name, flen);
- if (sanitize_path(fh->path))
- goto error;
- /* check if file exists: */
- if (set_blk_dev(fh))
- goto error;
- exists = fs_exists(fh->path);
- /* fs_exists() calls fs_close(), so open file system again */
- if (set_blk_dev(fh))
- goto error;
- if (!exists) {
- if (!(open_mode & EFI_FILE_MODE_CREATE) ||
- efi_create_file(fh, attributes))
- goto error;
- if (set_blk_dev(fh))
- goto error;
- }
- /* figure out if file is a directory: */
- fh->isdir = is_dir(fh);
- } else {
- fh->isdir = 1;
- strcpy(fh->path, "");
- }
- return &fh->base;
- error:
- free(fh);
- return NULL;
- }
- static efi_status_t efi_file_open_int(struct efi_file_handle *this,
- struct efi_file_handle **new_handle,
- u16 *file_name, u64 open_mode,
- u64 attributes)
- {
- struct file_handle *fh = to_fh(this);
- efi_status_t ret;
- /* Check parameters */
- if (!this || !new_handle || !file_name) {
- ret = EFI_INVALID_PARAMETER;
- goto out;
- }
- if (open_mode != EFI_FILE_MODE_READ &&
- open_mode != (EFI_FILE_MODE_READ | EFI_FILE_MODE_WRITE) &&
- open_mode != (EFI_FILE_MODE_READ | EFI_FILE_MODE_WRITE |
- EFI_FILE_MODE_CREATE)) {
- ret = EFI_INVALID_PARAMETER;
- goto out;
- }
- /*
- * The UEFI spec requires that attributes are only set in create mode.
- * The SCT does not care about this and sets EFI_FILE_DIRECTORY in
- * read mode. EDK2 does not check that attributes are zero if not in
- * create mode.
- *
- * So here we only check attributes in create mode and do not check
- * that they are zero otherwise.
- */
- if ((open_mode & EFI_FILE_MODE_CREATE) &&
- (attributes & (EFI_FILE_READ_ONLY | ~EFI_FILE_VALID_ATTR))) {
- ret = EFI_INVALID_PARAMETER;
- goto out;
- }
- /* Open file */
- *new_handle = file_open(fh->fs, fh, file_name, open_mode, attributes);
- if (*new_handle) {
- EFI_PRINT("file handle %p\n", *new_handle);
- ret = EFI_SUCCESS;
- } else {
- ret = EFI_NOT_FOUND;
- }
- out:
- return ret;
- }
- /**
- * efi_file_open_()
- *
- * This function implements the Open service of the File Protocol.
- * See the UEFI spec for details.
- *
- * @this: EFI_FILE_PROTOCOL instance
- * @new_handle: on return pointer to file handle
- * @file_name: file name
- * @open_mode: mode to open the file (read, read/write, create/read/write)
- * @attributes: attributes for newly created file
- */
- static efi_status_t EFIAPI efi_file_open(struct efi_file_handle *this,
- struct efi_file_handle **new_handle,
- u16 *file_name, u64 open_mode,
- u64 attributes)
- {
- efi_status_t ret;
- EFI_ENTRY("%p, %p, \"%ls\", %llx, %llu", this, new_handle,
- file_name, open_mode, attributes);
- ret = efi_file_open_int(this, new_handle, file_name, open_mode,
- attributes);
- return EFI_EXIT(ret);
- }
- /**
- * efi_file_open_ex() - open file asynchronously
- *
- * This function implements the OpenEx service of the File Protocol.
- * See the UEFI spec for details.
- *
- * @this: EFI_FILE_PROTOCOL instance
- * @new_handle: on return pointer to file handle
- * @file_name: file name
- * @open_mode: mode to open the file (read, read/write, create/read/write)
- * @attributes: attributes for newly created file
- * @token: transaction token
- */
- static efi_status_t EFIAPI efi_file_open_ex(struct efi_file_handle *this,
- struct efi_file_handle **new_handle,
- u16 *file_name, u64 open_mode,
- u64 attributes,
- struct efi_file_io_token *token)
- {
- efi_status_t ret;
- EFI_ENTRY("%p, %p, \"%ls\", %llx, %llu, %p", this, new_handle,
- file_name, open_mode, attributes, token);
- if (!token) {
- ret = EFI_INVALID_PARAMETER;
- goto out;
- }
- ret = efi_file_open_int(this, new_handle, file_name, open_mode,
- attributes);
- if (ret == EFI_SUCCESS && token->event) {
- token->status = EFI_SUCCESS;
- efi_signal_event(token->event);
- }
- out:
- return EFI_EXIT(ret);
- }
- static efi_status_t file_close(struct file_handle *fh)
- {
- fs_closedir(fh->dirs);
- free(fh);
- return EFI_SUCCESS;
- }
- static efi_status_t EFIAPI efi_file_close(struct efi_file_handle *file)
- {
- struct file_handle *fh = to_fh(file);
- EFI_ENTRY("%p", file);
- return EFI_EXIT(file_close(fh));
- }
- static efi_status_t EFIAPI efi_file_delete(struct efi_file_handle *file)
- {
- struct file_handle *fh = to_fh(file);
- efi_status_t ret = EFI_SUCCESS;
- EFI_ENTRY("%p", file);
- if (set_blk_dev(fh) || fs_unlink(fh->path))
- ret = EFI_WARN_DELETE_FAILURE;
- file_close(fh);
- return EFI_EXIT(ret);
- }
- /**
- * efi_get_file_size() - determine the size of a file
- *
- * @fh: file handle
- * @file_size: pointer to receive file size
- * Return: status code
- */
- static efi_status_t efi_get_file_size(struct file_handle *fh,
- loff_t *file_size)
- {
- if (set_blk_dev(fh))
- return EFI_DEVICE_ERROR;
- if (fs_size(fh->path, file_size))
- return EFI_DEVICE_ERROR;
- return EFI_SUCCESS;
- }
- /**
- * efi_file_size() - Get the size of a file using an EFI file handle
- *
- * @fh: EFI file handle
- * @size: buffer to fill in the discovered size
- *
- * Return: size of the file
- */
- efi_status_t efi_file_size(struct efi_file_handle *fh, efi_uintn_t *size)
- {
- struct efi_file_info *info = NULL;
- efi_uintn_t bs = 0;
- efi_status_t ret;
- *size = 0;
- ret = EFI_CALL(fh->getinfo(fh, (efi_guid_t *)&efi_file_info_guid, &bs,
- info));
- if (ret != EFI_BUFFER_TOO_SMALL) {
- ret = EFI_DEVICE_ERROR;
- goto out;
- }
- info = malloc(bs);
- if (!info) {
- ret = EFI_OUT_OF_RESOURCES;
- goto out;
- }
- ret = EFI_CALL(fh->getinfo(fh, (efi_guid_t *)&efi_file_info_guid, &bs,
- info));
- if (ret != EFI_SUCCESS)
- goto out;
- *size = info->file_size;
- out:
- free(info);
- return ret;
- }
- static efi_status_t file_read(struct file_handle *fh, u64 *buffer_size,
- void *buffer)
- {
- loff_t actread;
- efi_status_t ret;
- loff_t file_size;
- if (!buffer) {
- ret = EFI_INVALID_PARAMETER;
- return ret;
- }
- ret = efi_get_file_size(fh, &file_size);
- if (ret != EFI_SUCCESS)
- return ret;
- if (file_size < fh->offset) {
- ret = EFI_DEVICE_ERROR;
- return ret;
- }
- if (set_blk_dev(fh))
- return EFI_DEVICE_ERROR;
- if (fs_read(fh->path, map_to_sysmem(buffer), fh->offset,
- *buffer_size, &actread))
- return EFI_DEVICE_ERROR;
- *buffer_size = actread;
- fh->offset += actread;
- return EFI_SUCCESS;
- }
- static void rtc2efi(struct efi_time *time, struct rtc_time *tm)
- {
- memset(time, 0, sizeof(struct efi_time));
- time->year = tm->tm_year;
- time->month = tm->tm_mon;
- time->day = tm->tm_mday;
- time->hour = tm->tm_hour;
- time->minute = tm->tm_min;
- time->second = tm->tm_sec;
- }
- static efi_status_t dir_read(struct file_handle *fh, u64 *buffer_size,
- void *buffer)
- {
- struct efi_file_info *info = buffer;
- struct fs_dirent *dent;
- u64 required_size;
- u16 *dst;
- if (set_blk_dev(fh))
- return EFI_DEVICE_ERROR;
- if (!fh->dirs) {
- assert(fh->offset == 0);
- fh->dirs = fs_opendir(fh->path);
- if (!fh->dirs)
- return EFI_DEVICE_ERROR;
- fh->dent = NULL;
- }
- /*
- * So this is a bit awkward. Since fs layer is stateful and we
- * can't rewind an entry, in the EFI_BUFFER_TOO_SMALL case below
- * we might have to return without consuming the dent.. so we
- * have to stash it for next call.
- */
- if (fh->dent) {
- dent = fh->dent;
- } else {
- dent = fs_readdir(fh->dirs);
- }
- if (!dent) {
- /* no more files in directory */
- *buffer_size = 0;
- return EFI_SUCCESS;
- }
- /* check buffer size: */
- required_size = sizeof(*info) +
- 2 * (utf8_utf16_strlen(dent->name) + 1);
- if (*buffer_size < required_size) {
- *buffer_size = required_size;
- fh->dent = dent;
- return EFI_BUFFER_TOO_SMALL;
- }
- if (!buffer)
- return EFI_INVALID_PARAMETER;
- fh->dent = NULL;
- *buffer_size = required_size;
- memset(info, 0, required_size);
- info->size = required_size;
- info->file_size = dent->size;
- info->physical_size = dent->size;
- info->attribute = dent->attr;
- rtc2efi(&info->create_time, &dent->create_time);
- rtc2efi(&info->modification_time, &dent->change_time);
- rtc2efi(&info->last_access_time, &dent->access_time);
- if (dent->type == FS_DT_DIR)
- info->attribute |= EFI_FILE_DIRECTORY;
- dst = info->file_name;
- utf8_utf16_strcpy(&dst, dent->name);
- fh->offset++;
- return EFI_SUCCESS;
- }
- static efi_status_t efi_file_read_int(struct efi_file_handle *this,
- efi_uintn_t *buffer_size, void *buffer)
- {
- struct file_handle *fh = to_fh(this);
- efi_status_t ret = EFI_SUCCESS;
- u64 bs;
- if (!this || !buffer_size)
- return EFI_INVALID_PARAMETER;
- bs = *buffer_size;
- if (fh->isdir)
- ret = dir_read(fh, &bs, buffer);
- else
- ret = file_read(fh, &bs, buffer);
- if (bs <= SIZE_MAX)
- *buffer_size = bs;
- else
- *buffer_size = SIZE_MAX;
- return ret;
- }
- /**
- * efi_file_read() - read file
- *
- * This function implements the Read() service of the EFI_FILE_PROTOCOL.
- *
- * See the Unified Extensible Firmware Interface (UEFI) specification for
- * details.
- *
- * @this: file protocol instance
- * @buffer_size: number of bytes to read
- * @buffer: read buffer
- * Return: status code
- */
- static efi_status_t EFIAPI efi_file_read(struct efi_file_handle *this,
- efi_uintn_t *buffer_size, void *buffer)
- {
- efi_status_t ret;
- EFI_ENTRY("%p, %p, %p", this, buffer_size, buffer);
- ret = efi_file_read_int(this, buffer_size, buffer);
- return EFI_EXIT(ret);
- }
- /**
- * efi_file_read_ex() - read file asynchonously
- *
- * This function implements the ReadEx() service of the EFI_FILE_PROTOCOL.
- *
- * See the Unified Extensible Firmware Interface (UEFI) specification for
- * details.
- *
- * @this: file protocol instance
- * @token: transaction token
- * Return: status code
- */
- static efi_status_t EFIAPI efi_file_read_ex(struct efi_file_handle *this,
- struct efi_file_io_token *token)
- {
- efi_status_t ret;
- EFI_ENTRY("%p, %p", this, token);
- if (!token) {
- ret = EFI_INVALID_PARAMETER;
- goto out;
- }
- ret = efi_file_read_int(this, &token->buffer_size, token->buffer);
- if (ret == EFI_SUCCESS && token->event) {
- token->status = EFI_SUCCESS;
- efi_signal_event(token->event);
- }
- out:
- return EFI_EXIT(ret);
- }
- static efi_status_t efi_file_write_int(struct efi_file_handle *this,
- efi_uintn_t *buffer_size, void *buffer)
- {
- struct file_handle *fh = to_fh(this);
- efi_status_t ret = EFI_SUCCESS;
- loff_t actwrite;
- if (!this || !buffer_size || !buffer) {
- ret = EFI_INVALID_PARAMETER;
- goto out;
- }
- if (fh->isdir) {
- ret = EFI_UNSUPPORTED;
- goto out;
- }
- if (!(fh->open_mode & EFI_FILE_MODE_WRITE)) {
- ret = EFI_ACCESS_DENIED;
- goto out;
- }
- if (!*buffer_size)
- goto out;
- if (set_blk_dev(fh)) {
- ret = EFI_DEVICE_ERROR;
- goto out;
- }
- if (fs_write(fh->path, map_to_sysmem(buffer), fh->offset, *buffer_size,
- &actwrite)) {
- ret = EFI_DEVICE_ERROR;
- goto out;
- }
- *buffer_size = actwrite;
- fh->offset += actwrite;
- out:
- return ret;
- }
- /**
- * efi_file_write() - write to file
- *
- * This function implements the Write() service of the EFI_FILE_PROTOCOL.
- *
- * See the Unified Extensible Firmware Interface (UEFI) specification for
- * details.
- *
- * @this: file protocol instance
- * @buffer_size: number of bytes to write
- * @buffer: buffer with the bytes to write
- * Return: status code
- */
- static efi_status_t EFIAPI efi_file_write(struct efi_file_handle *this,
- efi_uintn_t *buffer_size,
- void *buffer)
- {
- efi_status_t ret;
- EFI_ENTRY("%p, %p, %p", this, buffer_size, buffer);
- ret = efi_file_write_int(this, buffer_size, buffer);
- return EFI_EXIT(ret);
- }
- /**
- * efi_file_write_ex() - write to file
- *
- * This function implements the WriteEx() service of the EFI_FILE_PROTOCOL.
- *
- * See the Unified Extensible Firmware Interface (UEFI) specification for
- * details.
- *
- * @this: file protocol instance
- * @token: transaction token
- * Return: status code
- */
- static efi_status_t EFIAPI efi_file_write_ex(struct efi_file_handle *this,
- struct efi_file_io_token *token)
- {
- efi_status_t ret;
- EFI_ENTRY("%p, %p", this, token);
- if (!token) {
- ret = EFI_INVALID_PARAMETER;
- goto out;
- }
- ret = efi_file_write_int(this, &token->buffer_size, token->buffer);
- if (ret == EFI_SUCCESS && token->event) {
- token->status = EFI_SUCCESS;
- efi_signal_event(token->event);
- }
- out:
- return EFI_EXIT(ret);
- }
- /**
- * efi_file_getpos() - get current position in file
- *
- * This function implements the GetPosition service of the EFI file protocol.
- * See the UEFI spec for details.
- *
- * @file: file handle
- * @pos: pointer to file position
- * Return: status code
- */
- static efi_status_t EFIAPI efi_file_getpos(struct efi_file_handle *file,
- u64 *pos)
- {
- efi_status_t ret = EFI_SUCCESS;
- struct file_handle *fh = to_fh(file);
- EFI_ENTRY("%p, %p", file, pos);
- if (fh->isdir) {
- ret = EFI_UNSUPPORTED;
- goto out;
- }
- *pos = fh->offset;
- out:
- return EFI_EXIT(ret);
- }
- /**
- * efi_file_setpos() - set current position in file
- *
- * This function implements the SetPosition service of the EFI file protocol.
- * See the UEFI spec for details.
- *
- * @file: file handle
- * @pos: new file position
- * Return: status code
- */
- static efi_status_t EFIAPI efi_file_setpos(struct efi_file_handle *file,
- u64 pos)
- {
- struct file_handle *fh = to_fh(file);
- efi_status_t ret = EFI_SUCCESS;
- EFI_ENTRY("%p, %llu", file, pos);
- if (fh->isdir) {
- if (pos != 0) {
- ret = EFI_UNSUPPORTED;
- goto error;
- }
- fs_closedir(fh->dirs);
- fh->dirs = NULL;
- }
- if (pos == ~0ULL) {
- loff_t file_size;
- ret = efi_get_file_size(fh, &file_size);
- if (ret != EFI_SUCCESS)
- goto error;
- pos = file_size;
- }
- fh->offset = pos;
- error:
- return EFI_EXIT(ret);
- }
- static efi_status_t EFIAPI efi_file_getinfo(struct efi_file_handle *file,
- const efi_guid_t *info_type,
- efi_uintn_t *buffer_size,
- void *buffer)
- {
- struct file_handle *fh = to_fh(file);
- efi_status_t ret = EFI_SUCCESS;
- u16 *dst;
- EFI_ENTRY("%p, %pUs, %p, %p", file, info_type, buffer_size, buffer);
- if (!file || !info_type || !buffer_size ||
- (*buffer_size && !buffer)) {
- ret = EFI_INVALID_PARAMETER;
- goto error;
- }
- if (!guidcmp(info_type, &efi_file_info_guid)) {
- struct efi_file_info *info = buffer;
- char *filename = basename(fh);
- unsigned int required_size;
- loff_t file_size;
- /* check buffer size: */
- required_size = sizeof(*info) +
- 2 * (utf8_utf16_strlen(filename) + 1);
- if (*buffer_size < required_size) {
- *buffer_size = required_size;
- ret = EFI_BUFFER_TOO_SMALL;
- goto error;
- }
- ret = efi_get_file_size(fh, &file_size);
- if (ret != EFI_SUCCESS)
- goto error;
- memset(info, 0, required_size);
- info->size = required_size;
- info->file_size = file_size;
- info->physical_size = file_size;
- if (fh->isdir)
- info->attribute |= EFI_FILE_DIRECTORY;
- dst = info->file_name;
- utf8_utf16_strcpy(&dst, filename);
- } else if (!guidcmp(info_type, &efi_file_system_info_guid)) {
- struct efi_file_system_info *info = buffer;
- struct disk_partition part;
- efi_uintn_t required_size;
- int r;
- if (fh->fs->part >= 1)
- r = part_get_info(fh->fs->desc, fh->fs->part, &part);
- else
- r = part_get_info_whole_disk(fh->fs->desc, &part);
- if (r < 0) {
- ret = EFI_DEVICE_ERROR;
- goto error;
- }
- required_size = sizeof(*info) + 2;
- if (*buffer_size < required_size) {
- *buffer_size = required_size;
- ret = EFI_BUFFER_TOO_SMALL;
- goto error;
- }
- memset(info, 0, required_size);
- info->size = required_size;
- /*
- * TODO: We cannot determine if the volume can be written to.
- */
- info->read_only = false;
- info->volume_size = part.size * part.blksz;
- /*
- * TODO: We currently have no function to determine the free
- * space. The volume size is the best upper bound we have.
- */
- info->free_space = info->volume_size;
- info->block_size = part.blksz;
- /*
- * TODO: The volume label is not available in U-Boot.
- */
- info->volume_label[0] = 0;
- } else if (!guidcmp(info_type, &efi_system_volume_label_id)) {
- if (*buffer_size < 2) {
- *buffer_size = 2;
- ret = EFI_BUFFER_TOO_SMALL;
- goto error;
- }
- *(u16 *)buffer = 0;
- } else {
- ret = EFI_UNSUPPORTED;
- }
- error:
- return EFI_EXIT(ret);
- }
- static efi_status_t EFIAPI efi_file_setinfo(struct efi_file_handle *file,
- const efi_guid_t *info_type,
- efi_uintn_t buffer_size,
- void *buffer)
- {
- struct file_handle *fh = to_fh(file);
- efi_status_t ret = EFI_UNSUPPORTED;
- EFI_ENTRY("%p, %pUs, %zu, %p", file, info_type, buffer_size, buffer);
- if (!guidcmp(info_type, &efi_file_info_guid)) {
- struct efi_file_info *info = (struct efi_file_info *)buffer;
- char *filename = basename(fh);
- char *new_file_name, *pos;
- loff_t file_size;
- /* The buffer will always contain a file name. */
- if (buffer_size < sizeof(struct efi_file_info) + 2 ||
- buffer_size < info->size) {
- ret = EFI_BAD_BUFFER_SIZE;
- goto out;
- }
- /* We cannot change the directory attribute */
- if (!fh->isdir != !(info->attribute & EFI_FILE_DIRECTORY)) {
- ret = EFI_ACCESS_DENIED;
- goto out;
- }
- /* Check for renaming */
- new_file_name = malloc(utf16_utf8_strlen(info->file_name) + 1);
- if (!new_file_name) {
- ret = EFI_OUT_OF_RESOURCES;
- goto out;
- }
- pos = new_file_name;
- utf16_utf8_strcpy(&pos, info->file_name);
- if (strcmp(new_file_name, filename)) {
- /* TODO: we do not support renaming */
- EFI_PRINT("Renaming not supported\n");
- free(new_file_name);
- ret = EFI_ACCESS_DENIED;
- goto out;
- }
- free(new_file_name);
- /* Check for truncation */
- ret = efi_get_file_size(fh, &file_size);
- if (ret != EFI_SUCCESS)
- goto out;
- if (file_size != info->file_size) {
- /* TODO: we do not support truncation */
- EFI_PRINT("Truncation not supported\n");
- ret = EFI_ACCESS_DENIED;
- goto out;
- }
- /*
- * We do not care for the other attributes
- * TODO: Support read only
- */
- ret = EFI_SUCCESS;
- } else {
- /* TODO: We do not support changing the volume label */
- ret = EFI_UNSUPPORTED;
- }
- out:
- return EFI_EXIT(ret);
- }
- /**
- * efi_file_flush_int() - flush file
- *
- * This is the internal implementation of the Flush() and FlushEx() services of
- * the EFI_FILE_PROTOCOL.
- *
- * @this: file protocol instance
- * Return: status code
- */
- static efi_status_t efi_file_flush_int(struct efi_file_handle *this)
- {
- struct file_handle *fh = to_fh(this);
- if (!this)
- return EFI_INVALID_PARAMETER;
- if (!(fh->open_mode & EFI_FILE_MODE_WRITE))
- return EFI_ACCESS_DENIED;
- /* TODO: flush for file position after end of file */
- return EFI_SUCCESS;
- }
- /**
- * efi_file_flush() - flush file
- *
- * This function implements the Flush() service of the EFI_FILE_PROTOCOL.
- *
- * See the Unified Extensible Firmware Interface (UEFI) specification for
- * details.
- *
- * @this: file protocol instance
- * Return: status code
- */
- static efi_status_t EFIAPI efi_file_flush(struct efi_file_handle *this)
- {
- efi_status_t ret;
- EFI_ENTRY("%p", this);
- ret = efi_file_flush_int(this);
- return EFI_EXIT(ret);
- }
- /**
- * efi_file_flush_ex() - flush file
- *
- * This function implements the FlushEx() service of the EFI_FILE_PROTOCOL.
- *
- * See the Unified Extensible Firmware Interface (UEFI) specification for
- * details.
- *
- * @this: file protocol instance
- * @token: transaction token
- * Return: status code
- */
- static efi_status_t EFIAPI efi_file_flush_ex(struct efi_file_handle *this,
- struct efi_file_io_token *token)
- {
- efi_status_t ret;
- EFI_ENTRY("%p, %p", this, token);
- if (!token) {
- ret = EFI_INVALID_PARAMETER;
- goto out;
- }
- ret = efi_file_flush_int(this);
- if (ret == EFI_SUCCESS && token->event) {
- token->status = EFI_SUCCESS;
- efi_signal_event(token->event);
- }
- out:
- return EFI_EXIT(ret);
- }
- static const struct efi_file_handle efi_file_handle_protocol = {
- .rev = EFI_FILE_PROTOCOL_REVISION2,
- .open = efi_file_open,
- .close = efi_file_close,
- .delete = efi_file_delete,
- .read = efi_file_read,
- .write = efi_file_write,
- .getpos = efi_file_getpos,
- .setpos = efi_file_setpos,
- .getinfo = efi_file_getinfo,
- .setinfo = efi_file_setinfo,
- .flush = efi_file_flush,
- .open_ex = efi_file_open_ex,
- .read_ex = efi_file_read_ex,
- .write_ex = efi_file_write_ex,
- .flush_ex = efi_file_flush_ex,
- };
- /**
- * efi_file_from_path() - open file via device path
- *
- * @fp: device path
- * @return: EFI_FILE_PROTOCOL for the file or NULL
- */
- struct efi_file_handle *efi_file_from_path(struct efi_device_path *fp)
- {
- struct efi_simple_file_system_protocol *v;
- struct efi_file_handle *f;
- efi_status_t ret;
- v = efi_fs_from_path(fp);
- if (!v)
- return NULL;
- EFI_CALL(ret = v->open_volume(v, &f));
- if (ret != EFI_SUCCESS)
- return NULL;
- /* Skip over device-path nodes before the file path. */
- while (fp && !EFI_DP_TYPE(fp, MEDIA_DEVICE, FILE_PATH))
- fp = efi_dp_next(fp);
- /*
- * Step through the nodes of the directory path until the actual file
- * node is reached which is the final node in the device path.
- */
- while (fp) {
- struct efi_device_path_file_path *fdp =
- container_of(fp, struct efi_device_path_file_path, dp);
- struct efi_file_handle *f2;
- u16 *filename;
- if (!EFI_DP_TYPE(fp, MEDIA_DEVICE, FILE_PATH)) {
- printf("bad file path!\n");
- f->close(f);
- return NULL;
- }
- filename = u16_strdup(fdp->str);
- if (!filename)
- return NULL;
- EFI_CALL(ret = f->open(f, &f2, filename,
- EFI_FILE_MODE_READ, 0));
- free(filename);
- if (ret != EFI_SUCCESS)
- return NULL;
- fp = efi_dp_next(fp);
- EFI_CALL(f->close(f));
- f = f2;
- }
- return f;
- }
- static efi_status_t EFIAPI
- efi_open_volume(struct efi_simple_file_system_protocol *this,
- struct efi_file_handle **root)
- {
- struct file_system *fs = to_fs(this);
- EFI_ENTRY("%p, %p", this, root);
- *root = file_open(fs, NULL, NULL, 0, 0);
- return EFI_EXIT(EFI_SUCCESS);
- }
- struct efi_simple_file_system_protocol *
- efi_simple_file_system(struct blk_desc *desc, int part,
- struct efi_device_path *dp)
- {
- struct file_system *fs;
- fs = calloc(1, sizeof(*fs));
- fs->base.rev = EFI_SIMPLE_FILE_SYSTEM_PROTOCOL_REVISION;
- fs->base.open_volume = efi_open_volume;
- fs->desc = desc;
- fs->part = part;
- fs->dp = dp;
- return &fs->base;
- }
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