5ab90a9307
Add compatibility function to support a single virtio-fs via the normal 'ls' and 'load' commands. Other commands are not supported for now. Add a workaround for the fact that virtiofs does not use a block device. The existing filesystem layer does not support non-block filesystems - sandbox's hostfs mostly bypasses this code. Make sure that sandbox does not try to mount a virtio-fs as this does not work at present. It will require either a fake driver for virtio-fs which connects to host files, or possibly something involving FUSE. Series-to: concept Cover-letter: virtio: Support virtio-fs This series introduces support for virtio-fs, a filesystem which provides access to host files from within a QEMU guest OS. A new filesystem driver is created with support for the three uclasses (FS, DIR, FILE). A compatibility layer is added as well, so that the existing cmdline work as expected. Only listing directories and reading files are supported so far. Since sandbox works by using a NULL blk_desc, a workaround is added for now. Once we switch commands (and bootstd!) over to the new filesystem approach, this will go away. It is possible to test this using something like: ./scripts/build-qemu -a x86 -rs -D . then within U-Boot: ls virtio 0 END Signed-off-by: Simon Glass <sjg@chromium.org>
83 lines
1.9 KiB
C
83 lines
1.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved.
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*/
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#ifndef _FS_COMMON_H
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#define _FS_COMMON_H
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#include <rtc.h>
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/**
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* @FS_TYPE_VIRTIO: virtio-fs for access to the host filesystem from QEMU
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*/
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enum fs_type_t {
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FS_TYPE_ANY = 0,
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FS_TYPE_FAT,
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FS_TYPE_EXT,
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FS_TYPE_SANDBOX,
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FS_TYPE_UBIFS,
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FS_TYPE_BTRFS,
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FS_TYPE_SQUASHFS,
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FS_TYPE_EROFS,
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FS_TYPE_SEMIHOSTING,
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FS_TYPE_EXFAT,
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FS_TYPE_VIRTIO,
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};
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/*
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* Directory entry types, matches the subset of DT_x in posix readdir()
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* which apply to u-boot.
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*/
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#define FS_DT_DIR 4 /* directory */
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#define FS_DT_REG 8 /* regular file */
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#define FS_DT_LNK 10 /* symbolic link */
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#define FS_DIRENT_NAME_LEN CONFIG_IS_ENABLED(FS_EXFAT, (1024), (256))
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/**
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* struct fs_dirent - directory entry
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*
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* A directory entry, returned by fs_readdir(). Returns information
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* about the file/directory at the current directory entry position.
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*/
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struct fs_dirent {
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/** @type: one of FS_DT_x (not a mask) */
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unsigned int type;
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/** @size: file size */
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loff_t size;
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/** @attr: attribute flags (FS_ATTR_*) */
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u32 attr;
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/** @create_time: time of creation */
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struct rtc_time create_time;
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/** @access_time: time of last access */
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struct rtc_time access_time;
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/** @change_time: time of last modification */
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struct rtc_time change_time;
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/** @name: file name */
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char name[FS_DIRENT_NAME_LEN];
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};
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/**
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* struct fs_dir_stream - Structure representing an opened directory
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*
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* Struct fs_dir_stream should be treated opaque to the user of fs layer.
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* The fields @desc and @part are used by the fs layer.
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* File system drivers pass additional private fields with the pointers
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* to this structure.
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*
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* @dev: dir device (UCLASS_DIR)
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* @desc: block device descriptor
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* @part: partition number
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*/
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struct fs_dir_stream {
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#ifdef CONFIG_FS
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struct udevice *dev;
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u64 fh;
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u64 offset;
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#endif
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struct blk_desc *desc;
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int part;
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};
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#endif
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