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NFS: Ensure we commit after writeback is complete

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If the page cache is being flushed, then we want to ensure that we
do start a commit once the pages are done being flushed.
If we just wait until all I/O is done to that file, we can end up
livelocking until the balance_dirty_pages() mechanism puts its
foot down and forces I/O to stop.
So instead we do more or less the same thing that O_DIRECT does,
and set up a counter to tell us when the flush is done,

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Trond Myklebust
2017-06-20 19:35:37 -04:00
committed by Anna Schumaker
parent b5973a8c1c
commit 919e3bd9a8
4 changed files with 63 additions and 0 deletions
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2
include/linux/nfs_xdr.h
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@@ -1422,6 +1422,7 @@ enum {
NFS_IOHDR_STAT,
};
struct nfs_io_completion;
struct nfs_pgio_header {
struct inode *inode;
struct rpc_cred *cred;
@@ -1435,6 +1436,7 @@ struct nfs_pgio_header {
void (*release) (struct nfs_pgio_header *hdr);
const struct nfs_pgio_completion_ops *completion_ops;
const struct nfs_rw_ops *rw_ops;
struct nfs_io_completion *io_completion;
struct nfs_direct_req *dreq;
spinlock_t lock;
/* fields protected by lock */