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/* SPDX-License-Identifier: GPL-2.0 */
/*
* struct nfs_fh is an NFS version-agnostic data structure that
* stores an NFS file handle. It is also commonly used in NFS
* related APIs.
*/
#ifndef _LINUX_NFS_FH_H
#define _LINUX_NFS_FH_H
#include <linux/types.h>
#include <linux/string.h>
#include <linux/crc32.h>
/*
* The largest file handle size today is an NFSv4 file handle,
* which can be up to 128 octets long.
*/
#define NFS_MAXFHSIZE 128
struct nfs_fh {
unsigned short size;
unsigned char data[NFS_MAXFHSIZE];
};
/**
* nfs_compare_fh - Compare two NFS file handles
* @a: An NFS file handle to be compared
* @b: An NFS file handle to be compared
*
* Checks only "size" bytes in each data field.
*
* Return: %false if the two file handles are equal, otherwise %true
*/
static inline bool nfs_compare_fh(const struct nfs_fh *a, const struct nfs_fh *b)
{
return a->size != b->size || memcmp(a->data, b->data, a->size) != 0;
}
/**
* nfs_copy_fh - Copy an NFS file handle
* @target: Destination file handle
* @source: Source file handle
*
* Copies source->size bytes of file handle data into target.
*/
static inline void nfs_copy_fh(struct nfs_fh *target, const struct nfs_fh *source)
{
target->size = source->size;
memcpy(target->data, source->data, source->size);
}
/**
* nfs_fhandle_hash - Calculate the crc32 hash for the filehandle
* @fh: An NFS file handle to hash
*
* Return: a crc32 hash for the filehandle that is compatible with
* the one displayed by "wireshark"
*/
static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh)
{
return ~crc32_le(0xFFFFFFFF, &fh->data[0], fh->size);
}
#endif /* _LINUX_NFS_FH_H */
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