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Commit 0ef63f34 authored by Aneesh Kumar K.V's avatar Aneesh Kumar K.V Committed by Eric Van Hensbergen
Browse files

net/9p: Implement attrwalk 9p call 



TXATTRWALK: Descend a ATTR namespace

 size[4] TXATTRWALK tag[2] fid[4] newfid[4] name[s]
 size[4] RXATTRWALK tag[2] size[8]

txattrwalk gets a fid pointing to xattr. This fid can later be
used to read the xattr value. If name is NULL the fid returned
can be used to get the list of extended attribute associated to
the file system object.

Signed-off-by: default avatarAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: default avatarVenkateswararao Jujjuri <jvrao@linux.vnet.ibm.com>
Signed-off-by: default avatarEric Van Hensbergen <ericvh@gmail.com>
parent ef56547e

include/net/9p/9p.h

+2 −0
Original line number Diff line number Diff line
@@ -153,6 +153,8 @@ enum p9_msg_t { 
	P9_RGETATTR,

	P9_TSETATTR = 26,

	P9_RSETATTR,

	P9_TXATTRWALK = 30,

	P9_RXATTRWALK,

	P9_TREADDIR = 40,

	P9_RREADDIR,

	P9_TLINK = 70,

include/net/9p/client.h

+1 −0
Original line number Diff line number Diff line
@@ -260,5 +260,6 @@ void p9stat_free(struct p9_wstat *); 


int p9_is_proto_dotu(struct p9_client *clnt);

int p9_is_proto_dotl(struct p9_client *clnt);

struct p9_fid *p9_client_xattrwalk(struct p9_fid *, const char *, u64 *);



#endif /* NET_9P_CLIENT_H */

net/9p/client.c

+50 −0
Original line number Diff line number Diff line
@@ -1622,6 +1622,56 @@ int p9_client_rename(struct p9_fid *fid, struct p9_fid *newdirfid, char *name) 
}

EXPORT_SYMBOL(p9_client_rename);



/*

 * An xattrwalk without @attr_name gives the fid for the lisxattr namespace

 */

struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid,

				const char *attr_name, u64 *attr_size)

{

	int err;

	struct p9_req_t *req;

	struct p9_client *clnt;

	struct p9_fid *attr_fid;



	err = 0;

	clnt = file_fid->clnt;

	attr_fid = p9_fid_create(clnt);

	if (IS_ERR(attr_fid)) {

		err = PTR_ERR(attr_fid);

		attr_fid = NULL;

		goto error;

	}

	P9_DPRINTK(P9_DEBUG_9P,

		">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n",

		file_fid->fid, attr_fid->fid, attr_name);



	req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds",

			file_fid->fid, attr_fid->fid, attr_name);

	if (IS_ERR(req)) {

		err = PTR_ERR(req);

		goto error;

	}

	err = p9pdu_readf(req->rc, clnt->proto_version, "q", attr_size);

	if (err) {

		p9pdu_dump(1, req->rc);

		p9_free_req(clnt, req);

		goto clunk_fid;

	}

	p9_free_req(clnt, req);

	P9_DPRINTK(P9_DEBUG_9P, "<<<  RXATTRWALK fid %d size %llu\n",

		attr_fid->fid, *attr_size);

	return attr_fid;

clunk_fid:

	p9_client_clunk(attr_fid);

	attr_fid = NULL;

error:

	if (attr_fid && (attr_fid != file_fid))

		p9_fid_destroy(attr_fid);



	return ERR_PTR(err);

}

EXPORT_SYMBOL_GPL(p9_client_xattrwalk);



int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset)

{

	int err, rsize, total;