forked from mirrors/linux
cd35b6cb46
nfs.ko, nfsd.ko, and lockd.ko all use crc32_le(), which is available
only when CONFIG_CRC32 is enabled. But the only NFS kconfig option that
selected CONFIG_CRC32 was CONFIG_NFS_DEBUG, which is client-specific and
did not actually guard the use of crc32_le() even on the client.
The code worked around this bug by only actually calling crc32_le() when
CONFIG_CRC32 is built-in, instead hard-coding '0' in other cases. This
avoided randconfig build errors, and in real kernels the fallback code
was unlikely to be reached since CONFIG_CRC32 is 'default y'. But, this
really needs to just be done properly, especially now that I'm planning
to update CONFIG_CRC32 to not be 'default y'.
Therefore, make CONFIG_NFS_FS, CONFIG_NFSD, and CONFIG_LOCKD select
CONFIG_CRC32. Then remove the fallback code that becomes unnecessary,
as well as the selection of CONFIG_CRC32 from CONFIG_NFS_DEBUG.
Fixes: 1264a2f053 ("NFS: refactor code for calculating the crc32 hash of a filehandle")
Signed-off-by: Eric Biggers <ebiggers@google.com>
Acked-by: Anna Schumaker <anna.schumaker@oracle.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
69 lines
1.7 KiB
C
69 lines
1.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* NFS protocol definitions
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*
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* This file contains constants mostly for Version 2 of the protocol,
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* but also has a couple of NFSv3 bits in (notably the error codes).
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*/
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#ifndef _LINUX_NFS_H
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#define _LINUX_NFS_H
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#include <linux/cred.h>
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#include <linux/sunrpc/auth.h>
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#include <linux/sunrpc/msg_prot.h>
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#include <linux/string.h>
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#include <linux/crc32.h>
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#include <uapi/linux/nfs.h>
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/* The LOCALIO program is entirely private to Linux and is
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* NOT part of the uapi.
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*/
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#define NFS_LOCALIO_PROGRAM 400122
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#define LOCALIOPROC_NULL 0
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#define LOCALIOPROC_UUID_IS_LOCAL 1
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/*
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* This is the kernel NFS client file handle representation
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*/
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#define NFS_MAXFHSIZE 128
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struct nfs_fh {
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unsigned short size;
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unsigned char data[NFS_MAXFHSIZE];
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};
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/*
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* Returns a zero iff the size and data fields match.
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* Checks only "size" bytes in the data field.
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*/
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static inline int nfs_compare_fh(const struct nfs_fh *a, const struct nfs_fh *b)
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{
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return a->size != b->size || memcmp(a->data, b->data, a->size) != 0;
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}
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static inline void nfs_copy_fh(struct nfs_fh *target, const struct nfs_fh *source)
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{
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target->size = source->size;
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memcpy(target->data, source->data, source->size);
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}
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enum nfs3_stable_how {
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NFS_UNSTABLE = 0,
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NFS_DATA_SYNC = 1,
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NFS_FILE_SYNC = 2,
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/* used by direct.c to mark verf as invalid */
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NFS_INVALID_STABLE_HOW = -1
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};
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/**
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* nfs_fhandle_hash - calculate the crc32 hash for the filehandle
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* @fh - pointer to filehandle
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*
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* returns a crc32 hash for the filehandle that is compatible with
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* the one displayed by "wireshark".
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*/
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static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh)
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{
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return ~crc32_le(0xFFFFFFFF, &fh->data[0], fh->size);
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}
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#endif /* _LINUX_NFS_H */
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