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authorAnand Avati <avati@redhat.com>2013-02-27 14:30:15 -0800
committerAnand Avati <avati@redhat.com>2013-03-20 19:52:31 -0700
commit7645411f134c2b7ae004f0a8478449965e424a97 (patch)
tree8321342b63ffaad561d7465214d1142bd6066d1e /xlators/nfs
parentfbb94768cb579f85416333f98a0fa655e10f88fc (diff)
nfs: handle stable write with @flags rather than fsync()
stable writes can be "made stable" by simply setting O_SYNC (or O_DSYNC, accordingly) in the write flags or fd->flags. Performing fsync() at the end of the write is extremely inefficient and completely messes up eager-locking logic in AFR. Change-Id: I4d954c133641e246b2ab4df874bad0282667561f BUG: 916372 Signed-off-by: Anand Avati <avati@redhat.com> Reviewed-on: http://review.gluster.org/4591 Tested-by: Gluster Build System <jenkins@build.gluster.com> Reviewed-by: Amar Tumballi <amarts@redhat.com> Reviewed-by: Jeff Darcy <jdarcy@redhat.com>
Diffstat (limited to 'xlators/nfs')
-rw-r--r--xlators/nfs/server/src/nfs-fops.c2
-rw-r--r--xlators/nfs/server/src/nfs3.c93
2 files changed, 27 insertions, 68 deletions
diff --git a/xlators/nfs/server/src/nfs-fops.c b/xlators/nfs/server/src/nfs-fops.c
index f85f6b2..b6edc99 100644
--- a/xlators/nfs/server/src/nfs-fops.c
+++ b/xlators/nfs/server/src/nfs-fops.c
@@ -1379,7 +1379,7 @@ nfs_fop_write (xlator_t *nfsx, xlator_t *xl, nfs_user_t *nfu, fd_t *fd,
iobref_add (nfl->iobref, srciob);
*/
STACK_WIND_COOKIE (frame, nfs_fop_writev_cbk, xl, xl,xl->fops->writev,
- fd, vector, count, offset, 0, srciobref, NULL);
+ fd, vector, count, offset, fd->flags, srciobref, NULL);
ret = 0;
err:
if (ret < 0) {
diff --git a/xlators/nfs/server/src/nfs3.c b/xlators/nfs/server/src/nfs3.c
index 3a4ad4c..b551d5f 100644
--- a/xlators/nfs/server/src/nfs3.c
+++ b/xlators/nfs/server/src/nfs3.c
@@ -2021,41 +2021,6 @@ nfs3svc_write_fsync_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
}
-/*
- * If this logic determines that the write should return a reply to the client
- * after this function, the return value is -1 and the writetype is reset to
- * the type of write we want to signify to the client.
- *
- * In case the write should continue to serve the request according to the type
- * of stable write, a 0 is returned and writetype is left as it is.
- */
-int
-nfs3_write_how (int *writetype, int write_trusted, int sync_trusted)
-{
- int ret = -1;
-
- if (*writetype == UNSTABLE) {
- /* On an UNSTABLE write, only return STABLE when trusted-write
- * is set. TW is also set when trusted-sync is set.
- */
- if (write_trusted)
- *writetype = FILE_SYNC;
-
- goto err;
- } else if ((*writetype == DATA_SYNC) || (*writetype == FILE_SYNC)) {
-
- /* On a STABLE write, if sync-trusted is on, only then, return
- * without syncing.
- */
- if (sync_trusted)
- goto err;
- }
-
- ret = 0;
-err:
- return ret;
-}
-
/*
* Before going into the write reply logic, here is a matrix that shows the
@@ -2094,12 +2059,8 @@ nfs3svc_write_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
struct iatt *postbuf, dict_t *xdata)
{
nfsstat3 stat = NFS3ERR_SERVERFAULT;
- int ret = -EFAULT;
- nfs_user_t nfu = {0, };
nfs3_call_state_t *cs = NULL;
struct nfs3_state *nfs3 = NULL;
- int write_trusted = 0;
- int sync_trusted = 0;
cs = frame->local;
nfs3 = rpcsvc_request_program_private (cs->req);
@@ -2114,35 +2075,14 @@ nfs3svc_write_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
stat = NFS3_OK;
cs->maxcount = op_ret;
- write_trusted = nfs3_export_write_trusted (cs->nfs3state,
- cs->resolvefh.exportid);
- sync_trusted = nfs3_export_sync_trusted (cs->nfs3state,
- cs->resolvefh.exportid);
- ret = nfs3_write_how (&cs->writetype, write_trusted, sync_trusted);
- if (ret == -1)
- goto err;
-
- nfs_request_user_init (&nfu, cs->req);
- /* Store the current preattr so that this can be used as the pre attr
- * when fsync returns. We dont want to use the preattr in fsync because
- * the write fop happened before the fsync.
- */
- cs->stbuf = *prebuf;
- ret = nfs_fsync (cs->nfsx, cs->vol, &nfu, cs->fd, 0,
- nfs3svc_write_fsync_cbk, cs);
- if (ret < 0)
- stat = nfs3_errno_to_nfsstat3 (-ret);
-
err:
- if (ret < 0) {
- nfs3_log_write_res (rpcsvc_request_xid (cs->req), stat,
- op_errno, cs->maxcount, cs->writetype,
- nfs3->serverstart);
- nfs3_write_reply (cs->req, stat, cs->maxcount,
- cs->writetype, nfs3->serverstart, prebuf,
- postbuf);
- nfs3_call_state_wipe (cs);
- }
+ nfs3_log_write_res (rpcsvc_request_xid (cs->req), stat,
+ op_errno, cs->maxcount, cs->writetype,
+ nfs3->serverstart);
+ nfs3_write_reply (cs->req, stat, cs->maxcount,
+ cs->writetype, nfs3->serverstart, prebuf,
+ postbuf);
+ nfs3_call_state_wipe (cs);
return 0;
}
@@ -2198,6 +2138,25 @@ nfs3_write_resume (void *carg)
}
cs->fd = fd; /* Gets unrefd when the call state is wiped. */
+
+/*
+ enum stable_how {
+ UNSTABLE = 0,
+ DATA_SYNC = 1,
+ FILE_SYNC = 2,
+ };
+*/
+ switch (cs->writetype) {
+ case UNSTABLE:
+ break;
+ case DATA_SYNC:
+ fd->flags |= O_DSYNC;
+ break;
+ case FILE_SYNC:
+ fd->flags |= O_SYNC;
+ break;
+ }
+
ret = __nfs3_write_resume (cs);
if (ret < 0)
stat = nfs3_errno_to_nfsstat3 (-ret);