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NFSv4.2: query the server for extended attribute support

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Query the server for extended attribute support, and record it
as the NFS_CAP_XATTR flag in the server capabilities.

Signed-off-by: Frank van der Linden <fllinden@amazon.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
This commit is contained in:
Frank van der Linden
2020-06-23 22:38:55 +00:00
committed by Trond Myklebust
parent 04a5da690e
commit b78ef845c3
5 changed files with 32 additions and 1 deletions
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25
fs/nfs/nfs4xdr.c
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@@ -4201,6 +4201,26 @@ static int decode_attr_time_modify(struct xdr_stream *xdr, uint32_t *bitmap, str
return status;
}
static int decode_attr_xattrsupport(struct xdr_stream *xdr, uint32_t *bitmap,
uint32_t *res)
{
__be32 *p;
*res = 0;
if (unlikely(bitmap[2] & (FATTR4_WORD2_XATTR_SUPPORT - 1U)))
return -EIO;
if (likely(bitmap[2] & FATTR4_WORD2_XATTR_SUPPORT)) {
p = xdr_inline_decode(xdr, 4);
if (unlikely(!p))
return -EIO;
*res = be32_to_cpup(p);
bitmap[2] &= ~FATTR4_WORD2_XATTR_SUPPORT;
}
dprintk("%s: XATTR support=%s\n", __func__,
*res == 0 ? "false" : "true");
return 0;
}
static int verify_attr_len(struct xdr_stream *xdr, unsigned int savep, uint32_t attrlen)
{
unsigned int attrwords = XDR_QUADLEN(attrlen);
@@ -4855,6 +4875,11 @@ static int decode_fsinfo(struct xdr_stream *xdr, struct nfs_fsinfo *fsinfo)
if (status)
goto xdr_error;
status = decode_attr_xattrsupport(xdr, bitmap,
&fsinfo->xattr_support);
if (status)
goto xdr_error;
status = verify_attr_len(xdr, savep, attrlen);
xdr_error:
dprintk("%s: xdr returned %d!\n", __func__, -status);