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NFSv4.1 Fix gdia_maxcount calculation to fit in ca_maxresponsesize

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The GETDEVICEINFO gdia_maxcount represents all of the data being returned
within the GETDEVICEINFO4resok structure and includes the XDR overhead.

The CREATE_SESSION ca_maxresponsesize is the maximum reply and includes the RPC
headers (including security flavor credentials and verifiers).

Split out the struct pnfs_device field maxcount which is the gdia_maxcount
from the pglen field which is the reply (the total) buffer length.

Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Andy Adamson 2013-06-25 19:02:53 -04:00 committed by Trond Myklebust
parent ffa57b9e53
commit f1c097be2b
4 changed files with 11 additions and 2 deletions
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1
fs/nfs/internal.h
View file

@ -255,6 +255,7 @@ extern int nfs4_decode_dirent(struct xdr_stream *,
#ifdef CONFIG_NFS_V4_1
extern const u32 nfs41_maxread_overhead;
extern const u32 nfs41_maxwrite_overhead;
extern const u32 nfs41_maxgetdevinfo_overhead;
#endif
/* nfs4proc.c */

1
fs/nfs/nfs4filelayoutdev.c
View file

@ -711,6 +711,7 @@ filelayout_get_device_info(struct inode *inode,
pdev->pgbase = 0;
pdev->pglen = max_resp_sz;
pdev->mincount = 0;
pdev->maxcount = max_resp_sz - nfs41_maxgetdevinfo_overhead;
rc = nfs4_proc_getdeviceinfo(server, pdev, cred);
dprintk("%s getdevice info returns %d\n", __func__, rc);

8
fs/nfs/nfs4xdr.c
View file

@ -853,6 +853,12 @@ const u32 nfs41_maxread_overhead = ((RPC_MAX_HEADER_WITH_AUTH +
decode_sequence_maxsz +
decode_putfh_maxsz) *
XDR_UNIT);
const u32 nfs41_maxgetdevinfo_overhead = ((RPC_MAX_REPHEADER_WITH_AUTH +
compound_decode_hdr_maxsz +
decode_sequence_maxsz) *
XDR_UNIT);
EXPORT_SYMBOL_GPL(nfs41_maxgetdevinfo_overhead);
#endif /* CONFIG_NFS_V4_1 */
static const umode_t nfs_type2fmt[] = {
@ -1889,7 +1895,7 @@ encode_getdeviceinfo(struct xdr_stream *xdr,
p = xdr_encode_opaque_fixed(p, args->pdev->dev_id.data,
NFS4_DEVICEID4_SIZE);
*p++ = cpu_to_be32(args->pdev->layout_type);
*p++ = cpu_to_be32(args->pdev->pglen); /* gdia_maxcount */
*p++ = cpu_to_be32(args->pdev->maxcount); /* gdia_maxcount */
*p++ = cpu_to_be32(0); /* bitmap length 0 */
}

3
fs/nfs/pnfs.h
View file

@ -149,9 +149,10 @@ struct pnfs_device {
struct nfs4_deviceid dev_id;
unsigned int layout_type;
unsigned int mincount;
unsigned int maxcount; /* gdia_maxcount */
struct page **pages;
unsigned int pgbase;
unsigned int pglen;
unsigned int pglen; /* reply buffer length */
};
#define NFS4_PNFS_GETDEVLIST_MAXNUM 16