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b1f0067aba
This patch crossports volumes.[ch] from btrfs-progs, including: - btrfs_map_block() The core mechanism to map btrfs logical address to physical address. This version includes multi-device support, along with RAID56 support. - btrfs_scan_one_device() This is the function to register one btrfs device to the list. This is the main part of the multi-device btrfs assembling process. Although we're not going to support multiple devices until U-Boot allows us to scan one device without actually opening it. Signed-off-by: Qu Wenruo <wqu@suse.com> Reviewed-by: Marek Behún <marek.behun@nic.cz> [trini: Use %zu in a debug print to avoid warning] Signed-off-by: Tom Rini <trini@konsulko.com>
76 lines
1.8 KiB
C
76 lines
1.8 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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#ifndef __BTRFS_COMPAT_H__
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#define __BTRFS_COMPAT_H__
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#include <linux/errno.h>
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#include <fs_internal.h>
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#include <uuid.h>
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/* Provide a compatibility layer to make code syncing easier */
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/* A simple wraper to for error() used in btrfs-progs */
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#define error(fmt, ...) pr_err("BTRFS: " fmt "\n", ##__VA_ARGS__)
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#define BTRFS_UUID_UNPARSED_SIZE 37
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/*
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* Macros to generate set/get funcs for the struct fields
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* assume there is a lefoo_to_cpu for every type, so lets make a simple
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* one for u8:
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*/
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#define le8_to_cpu(v) (v)
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#define cpu_to_le8(v) (v)
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#define __le8 u8
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/*
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* Macros to generate set/get funcs for the struct fields
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* assume there is a lefoo_to_cpu for every type, so lets make a simple
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* one for u8:
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*/
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#define le8_to_cpu(v) (v)
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#define cpu_to_le8(v) (v)
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#define __le8 u8
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#define get_unaligned_le8(p) (*((u8 *)(p)))
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#define get_unaligned_8(p) (*((u8 *)(p)))
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#define put_unaligned_le8(val,p) ((*((u8 *)(p))) = (val))
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#define put_unaligned_8(val,p) ((*((u8 *)(p))) = (val))
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/*
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* Read data from device specified by @desc and @part
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*
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* U-boot equivalent of pread().
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*
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* Return the bytes of data read.
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* Return <0 for error.
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*/
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static inline int __btrfs_devread(struct blk_desc *desc,
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struct disk_partition *part,
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void *buf, size_t size, u64 offset)
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{
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lbaint_t sector;
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int byte_offset;
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int ret;
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sector = offset >> desc->log2blksz;
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byte_offset = offset % desc->blksz;
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/* fs_devread() return 0 for error, >0 for success */
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ret = fs_devread(desc, part, sector, byte_offset, size, buf);
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if (!ret)
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return -EIO;
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return size;
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}
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static inline void uuid_unparse(const u8 *uuid, char *out)
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{
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return uuid_bin_to_str((unsigned char *)uuid, out, 0);
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}
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static inline int is_power_of_2(unsigned long n)
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{
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return (n != 0 && ((n & (n - 1)) == 0));
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}
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#endif
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