Commit b78ef845 authored by Frank van der Linden's avatar Frank van der Linden Committed by Trond Myklebust
Browse files

NFSv4.2: query the server for extended attribute support 



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

Signed-off-by: default avatarFrank van der Linden <fllinden@amazon.com>
Signed-off-by: default avatarTrond Myklebust <trond.myklebust@hammerspace.com>
parent 04a5da69

fs/nfs/client.c

+3 −0
Original line number Diff line number Diff line
@@ -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

}

fs/nfs/nfs4proc.c

+2 −1
Original line number Diff line number Diff line
@@ -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)

{

fs/nfs/nfs4xdr.c

+25 −0
Original line number Diff line number Diff line
@@ -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);

include/linux/nfs_fs_sb.h

+1 −0
Original line number Diff line number Diff line
@@ -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

include/linux/nfs_xdr.h

+1 −0
Original line number Diff line number Diff line
@@ -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 {

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