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Commit 1549210f authored by Trond Myklebust's avatar Trond Myklebust
Browse files

NFSv4: Fix an Oops in the open recovery code 



The open recovery code does not need to request a new value for the
mdsthreshold, and so does not allocate a struct nfs4_threshold.
The problem is that encode_getfattr_open() will still request an
mdsthreshold, and so we end up Oopsing in decode_attr_mdsthreshold.

This patch fixes encode_getfattr_open so that it doesn't request an
mdsthreshold when the caller isn't asking for one. It also fixes
decode_attr_mdsthreshold so that it errors if the server returns
an mdsthreshold that we didn't ask for (instead of Oopsing).

Signed-off-by: default avatarTrond Myklebust <Trond.Myklebust@netapp.com>
Cc: Andy Adamson <andros@netapp.com>
parent b3b02ae5

fs/nfs/nfs4_fs.h

+1 −1
Original line number Diff line number Diff line
@@ -295,7 +295,7 @@ is_ds_client(struct nfs_client *clp) 


extern const struct nfs4_minor_version_ops *nfs_v4_minor_ops[];



extern const u32 nfs4_fattr_bitmap[2];

extern const u32 nfs4_fattr_bitmap[3];

extern const u32 nfs4_statfs_bitmap[2];

extern const u32 nfs4_pathconf_bitmap[2];

extern const u32 nfs4_fsinfo_bitmap[3];

fs/nfs/nfs4proc.c

+21 −1
Original line number Diff line number Diff line
@@ -116,7 +116,7 @@ static int nfs4_map_errors(int err) 
/*

 * This is our standard bitmap for GETATTR requests.

 */

const u32 nfs4_fattr_bitmap[2] = {

const u32 nfs4_fattr_bitmap[3] = {

	FATTR4_WORD0_TYPE

	| FATTR4_WORD0_CHANGE

	| FATTR4_WORD0_SIZE
@@ -133,6 +133,24 @@ const u32 nfs4_fattr_bitmap[2] = { 
	| FATTR4_WORD1_TIME_MODIFY

};



static const u32 nfs4_pnfs_open_bitmap[3] = {

	FATTR4_WORD0_TYPE

	| FATTR4_WORD0_CHANGE

	| FATTR4_WORD0_SIZE

	| FATTR4_WORD0_FSID

	| FATTR4_WORD0_FILEID,

	FATTR4_WORD1_MODE

	| FATTR4_WORD1_NUMLINKS

	| FATTR4_WORD1_OWNER

	| FATTR4_WORD1_OWNER_GROUP

	| FATTR4_WORD1_RAWDEV

	| FATTR4_WORD1_SPACE_USED

	| FATTR4_WORD1_TIME_ACCESS

	| FATTR4_WORD1_TIME_METADATA

	| FATTR4_WORD1_TIME_MODIFY,

	FATTR4_WORD2_MDSTHRESHOLD

};



const u32 nfs4_statfs_bitmap[2] = {

	FATTR4_WORD0_FILES_AVAIL

	| FATTR4_WORD0_FILES_FREE
@@ -844,6 +862,7 @@ static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry, 
	p->o_arg.name = &dentry->d_name;

	p->o_arg.server = server;

	p->o_arg.bitmask = server->attr_bitmask;

	p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];

	p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;

	if (attrs != NULL && attrs->ia_valid != 0) {

		__be32 verf[2];
@@ -1820,6 +1839,7 @@ static int _nfs4_do_open(struct inode *dir, 
		opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();

		if (!opendata->f_attr.mdsthreshold)

			goto err_opendata_put;

		opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];

	}

	if (dentry->d_inode != NULL)

		opendata->state = nfs4_get_open_state(dentry->d_inode, sp);

fs/nfs/nfs4xdr.c

+8 −4
Original line number Diff line number Diff line
@@ -1198,12 +1198,13 @@ static void encode_getfattr(struct xdr_stream *xdr, const u32* bitmask, struct c 
}



static void encode_getfattr_open(struct xdr_stream *xdr, const u32 *bitmask,

				 const u32 *open_bitmap,

				 struct compound_hdr *hdr)

{

	encode_getattr_three(xdr,

			     bitmask[0] & nfs4_fattr_bitmap[0],

			     bitmask[1] & nfs4_fattr_bitmap[1],

			     bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD,

			     bitmask[0] & open_bitmap[0],

			     bitmask[1] & open_bitmap[1],

			     bitmask[2] & open_bitmap[2],

			     hdr);

}
@@ -2221,7 +2222,7 @@ static void nfs4_xdr_enc_open(struct rpc_rqst *req, struct xdr_stream *xdr, 
	encode_putfh(xdr, args->fh, &hdr);

	encode_open(xdr, args, &hdr);

	encode_getfh(xdr, &hdr);

	encode_getfattr_open(xdr, args->bitmask, &hdr);

	encode_getfattr_open(xdr, args->bitmask, args->open_bitmap, &hdr);

	encode_nops(&hdr);

}
@@ -4360,6 +4361,9 @@ static int decode_attr_mdsthreshold(struct xdr_stream *xdr, 
	if (unlikely(bitmap[2] & (FATTR4_WORD2_MDSTHRESHOLD - 1U)))

		return -EIO;

	if (likely(bitmap[2] & FATTR4_WORD2_MDSTHRESHOLD)) {

		/* Did the server return an unrequested attribute? */

		if (unlikely(res == NULL))

			return -EREMOTEIO;

		p = xdr_inline_decode(xdr, 4);

		if (unlikely(!p))

			goto out_overflow;

include/linux/nfs_xdr.h

+1 −0
Original line number Diff line number Diff line
@@ -348,6 +348,7 @@ struct nfs_openargs { 
	const struct qstr *	name;

	const struct nfs_server *server;	 /* Needed for ID mapping */

	const u32 *		bitmask;

	const u32 *		open_bitmap;

	__u32			claim;

	struct nfs4_sequence_args	seq_args;

};