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NFSv4.2: Fix READ_PLUS size calculations

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I bump the decode_read_plus_maxsz to account for hole segments, but I
need to subtract out this increase when calling
rpc_prepare_reply_pages() so the common case of single data segment
replies can be directly placed into the xdr pages without needing to be
shifted around.

Reported-by: Chuck Lever <chuck.lever@oracle.com>
Fixes: d3b00a802c ("NFS: Replace the READ_PLUS decoding code")
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Anna Schumaker 2023-05-31 17:02:54 -04:00
parent bb05a617f0
commit 8d18f6c5bb
1 changed files with 9 additions and 3 deletions
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12
fs/nfs/nfs42xdr.c
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@ -54,10 +54,16 @@
(1 /* data_content4 */ + \
2 /* data_info4.di_offset */ + \
1 /* data_info4.di_length */)
#define NFS42_READ_PLUS_HOLE_SEGMENT_SIZE \
(1 /* data_content4 */ + \
2 /* data_info4.di_offset */ + \
2 /* data_info4.di_length */)
#define READ_PLUS_SEGMENT_SIZE_DIFF (NFS42_READ_PLUS_HOLE_SEGMENT_SIZE - \
NFS42_READ_PLUS_DATA_SEGMENT_SIZE)
#define decode_read_plus_maxsz (op_decode_hdr_maxsz + \
1 /* rpr_eof */ + \
1 /* rpr_contents count */ + \
NFS42_READ_PLUS_DATA_SEGMENT_SIZE)
NFS42_READ_PLUS_HOLE_SEGMENT_SIZE)
#define encode_seek_maxsz (op_encode_hdr_maxsz + \
encode_stateid_maxsz + \
2 /* offset */ + \
@ -617,8 +623,8 @@ static void nfs4_xdr_enc_read_plus(struct rpc_rqst *req,
encode_putfh(xdr, args->fh, &hdr);
encode_read_plus(xdr, args, &hdr);
rpc_prepare_reply_pages(req, args->pages, args->pgbase,
args->count, hdr.replen);
rpc_prepare_reply_pages(req, args->pages, args->pgbase, args->count,
hdr.replen - READ_PLUS_SEGMENT_SIZE_DIFF);
encode_nops(&hdr);
}