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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: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
This commit is contained in:
Aneesh Kumar K.V 2011-03-08 16:39:49 +05:30 committed by Eric Van Hensbergen
parent 059c138bc7
commit ea59bb759b
1 changed files with 13 additions and 2 deletions
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15
fs/9p/fid.c
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@ -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);