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nfs: get clone_blksize when probing fsinfo

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NFSv42 CLONE operation is supposed to respect it.

Signed-off-by: Peng Tao <tao.peng@primarydata.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
This commit is contained in:
Peng Tao
2015-09-26 02:24:37 +08:00
committed by Trond Myklebust
parent bea51b30b2
commit 2a92ee92d4
6 changed files with 30 additions and 0 deletions
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25
fs/nfs/nfs4xdr.c
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@@ -4764,6 +4764,28 @@ static int decode_attr_layout_blksize(struct xdr_stream *xdr, uint32_t *bitmap,
return 0;
}
/*
* The granularity of a CLONE operation.
*/
static int decode_attr_clone_blksize(struct xdr_stream *xdr, uint32_t *bitmap,
uint32_t *res)
{
__be32 *p;
dprintk("%s: bitmap is %x\n", __func__, bitmap[2]);
*res = 0;
if (bitmap[2] & FATTR4_WORD2_CLONE_BLKSIZE) {
p = xdr_inline_decode(xdr, 4);
if (unlikely(!p)) {
print_overflow_msg(__func__, xdr);
return -EIO;
}
*res = be32_to_cpup(p);
bitmap[2] &= ~FATTR4_WORD2_CLONE_BLKSIZE;
}
return 0;
}
static int decode_fsinfo(struct xdr_stream *xdr, struct nfs_fsinfo *fsinfo)
{
unsigned int savep;
@@ -4796,6 +4818,9 @@ static int decode_fsinfo(struct xdr_stream *xdr, struct nfs_fsinfo *fsinfo)
if (status != 0)
goto xdr_error;
status = decode_attr_layout_blksize(xdr, bitmap, &fsinfo->blksize);
if (status)
goto xdr_error;
status = decode_attr_clone_blksize(xdr, bitmap, &fsinfo->clone_blksize);
if (status)
goto xdr_error;