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NFS: Don't use DATA_SYNC writes

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If we're writing back data, and the FLUSH_STABLE flag is set, then we
always want to use NFS_FILE_SYNC, since we're always in a situation where
we're doing page reclaim, and so we want to free up the page as quickly
as possible.

If we're in the FLUSH_COND_STABLE case, then we either want to use another
unstable write (if we have to do a commit anyway) or again, we want to
use NFS_FILE_SYNC because we know that we have no more pages to write
out.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust 2011-07-12 13:42:01 -04:00
parent c47abcf8ff
commit 87ed5eb44a
1 changed files with 8 additions and 4 deletions
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10
fs/nfs/write.c
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@ -872,9 +872,13 @@ static int nfs_write_rpcsetup(struct nfs_page *req,
data->args.context = get_nfs_open_context(req->wb_context);
data->args.lock_context = req->wb_lock_context;
data->args.stable = NFS_UNSTABLE;
if (how & (FLUSH_STABLE | FLUSH_COND_STABLE)) {
data->args.stable = NFS_DATA_SYNC;
if (!nfs_need_commit(NFS_I(inode)))
switch (how & (FLUSH_STABLE | FLUSH_COND_STABLE)) {
case 0:
break;
case FLUSH_COND_STABLE:
if (nfs_need_commit(NFS_I(inode)))
break;
default:
data->args.stable = NFS_FILE_SYNC;
}