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

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
...@@ -286,9 +286,11 @@ static struct p9_fid *v9fs_fid_clone_with_uid(struct dentry *dentry, uid_t uid) ...@@ -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) struct p9_fid *v9fs_writeback_fid(struct dentry *dentry)
{ {
int err; int err, flags;
struct p9_fid *fid; struct p9_fid *fid;
struct v9fs_session_info *v9ses;
v9ses = v9fs_inode2v9ses(dentry->d_inode);
fid = v9fs_fid_clone_with_uid(dentry, 0); fid = v9fs_fid_clone_with_uid(dentry, 0);
if (IS_ERR(fid)) if (IS_ERR(fid))
goto error_out; goto error_out;
...@@ -297,8 +299,17 @@ struct p9_fid *v9fs_writeback_fid(struct dentry *dentry) ...@@ -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 * dirty pages. We always request for the open fid in read-write
* mode so that a partial page write which result in page * mode so that a partial page write which result in page
* read can work. * 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) { if (err < 0) {
p9_client_clunk(fid); p9_client_clunk(fid);
fid = ERR_PTR(err); fid = ERR_PTR(err);
......
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