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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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3
fs/nfs/client.c
View File

@ -809,6 +809,9 @@ static void nfs_server_set_fsinfo(struct nfs_server *server,
XATTR_SIZE_MAX);
server->lxasize = min_t(unsigned int, raw_max_rpc_payload,
nfs42_listxattr_xdrsize(XATTR_LIST_MAX));
if (fsinfo->xattr_support)
server->caps |= NFS_CAP_XATTR;
#endif
}

3
fs/nfs/nfs4proc.c
View File

@ -256,6 +256,7 @@ const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
| FATTR4_WORD1_FS_LAYOUT_TYPES,
FATTR4_WORD2_LAYOUT_BLKSIZE
| FATTR4_WORD2_CLONE_BLKSIZE
| FATTR4_WORD2_XATTR_SUPPORT
};
const u32 nfs4_fs_locations_bitmap[3] = {
@ -3740,7 +3741,7 @@ static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
#define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL)
#define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL)
#define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_MODE_UMASK - 1UL)
#define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_XATTR_SUPPORT - 1UL)
static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
{

25
fs/nfs/nfs4xdr.c
View File

@ -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);

1
include/linux/nfs_fs_sb.h
View File

@ -286,5 +286,6 @@ struct nfs_server {
#define NFS_CAP_OFFLOAD_CANCEL (1U << 25)
#define NFS_CAP_LAYOUTERROR (1U << 26)
#define NFS_CAP_COPY_NOTIFY (1U << 27)
#define NFS_CAP_XATTR (1U << 28)
#endif

1
include/linux/nfs_xdr.h
View File

@ -150,6 +150,7 @@ struct nfs_fsinfo {
__u32 layouttype[NFS_MAX_LAYOUT_TYPES]; /* supported pnfs layout driver */
__u32 blksize; /* preferred pnfs io block size */
__u32 clone_blksize; /* granularity of a CLONE operation */
__u32 xattr_support; /* User xattrs supported */
};
struct nfs_fsstat {