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NFS: Don't write back further requests if there is a pending write error 

If the server has already returned a fatal write error that the user
has not yet received on this file, then don't write back the other pages.
Instead, act as if they have been sent, and have returned with the same
error.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
This commit is contained in:
Trond Myklebust 2017-04-25 12:06:00 -04:00
parent 6aeafd05ec
commit a6598813a4
1 changed files with 21 additions and 4 deletions
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25
fs/nfs/write.c
View File

@ -569,6 +569,18 @@ static void nfs_write_error_remove_page(struct nfs_page *req)
nfs_release_request(req);
}
static bool
nfs_error_is_fatal_on_server(int err)
{
switch (err) {
case 0:
case -ERESTARTSYS:
case -EINTR:
return false;
}
return nfs_error_is_fatal(err);
}
/*
* Find an associated nfs write request, and prepare to flush it out
* May return an error if the user signalled nfs_wait_on_request().
@ -591,6 +603,10 @@ static int nfs_page_async_flush(struct nfs_pageio_descriptor *pgio,
WARN_ON_ONCE(test_bit(PG_CLEAN, &req->wb_flags));
ret = 0;
/* If there is a fatal error that covers this write, just exit */
if (nfs_error_is_fatal_on_server(req->wb_context->error))
goto out_launder;
if (!nfs_pageio_add_request(pgio, req)) {
ret = pgio->pg_error;
/*
@ -600,10 +616,8 @@ static int nfs_page_async_flush(struct nfs_pageio_descriptor *pgio,
*/
if (nfs_error_is_fatal(ret)) {
nfs_context_set_write_error(req->wb_context, ret);
if (launder) {
nfs_write_error_remove_page(req);
goto out;
}
if (launder)
goto out_launder;
}
nfs_redirty_request(req);
ret = -EAGAIN;
@ -612,6 +626,9 @@ static int nfs_page_async_flush(struct nfs_pageio_descriptor *pgio,
NFSIOS_WRITEPAGES, 1);
out:
return ret;
out_launder:
nfs_write_error_remove_page(req);
return ret;
}
static int nfs_do_writepage(struct page *page, struct writeback_control *wbc,