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Commit ea59bb75 authored by Aneesh Kumar K.V's avatar Aneesh Kumar K.V Committed by Eric Van Hensbergen
Browse files

fs/9p: Open writeback fid in O_SYNC mode 



Older version of protocol don't support tsyncfs operation.
So for them force a O_SYNC flag on the server

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 059c138b

fs/9p/fid.c

+13 −2
Original line number Diff line number Diff line
@@ -286,9 +286,11 @@ static struct p9_fid *v9fs_fid_clone_with_uid(struct dentry *dentry, uid_t uid) 


struct p9_fid *v9fs_writeback_fid(struct dentry *dentry)

{

	int err;

	int err, flags;

	struct p9_fid *fid;

	struct v9fs_session_info *v9ses;



	v9ses = v9fs_inode2v9ses(dentry->d_inode);

	fid = v9fs_fid_clone_with_uid(dentry, 0);

	if (IS_ERR(fid))

		goto error_out;
@@ -297,8 +299,17 @@ struct p9_fid *v9fs_writeback_fid(struct dentry *dentry) 
	 * dirty pages. We always request for the open fid in read-write

	 * mode so that a partial page write which result in page

	 * read can work.

	 *

	 * we don't have a tsyncfs operation for older version

	 * of protocol. So make sure the write back fid is

	 * opened in O_SYNC mode.

	 */

	err = p9_client_open(fid, O_RDWR);

	if (!v9fs_proto_dotl(v9ses))

		flags = O_RDWR | O_SYNC;

	else

		flags = O_RDWR;



	err = p9_client_open(fid, flags);

	if (err < 0) {

		p9_client_clunk(fid);

		fid = ERR_PTR(err);