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Message-ID: <162687511125.276387.15493860267582539643.stgit@warthog.procyon.org.uk>
Date: Wed, 21 Jul 2021 14:45:11 +0100
From: David Howells <dhowells@...hat.com>
To: linux-fsdevel@...r.kernel.org
Cc: dhowells@...hat.com, Jeff Layton <jlayton@...hat.com>,
"Matthew Wilcox (Oracle)" <willy@...radead.org>,
Anna Schumaker <anna.schumaker@...app.com>,
Steve French <sfrench@...ba.org>,
Dominique Martinet <asmadeus@...ewreck.org>,
Mike Marshall <hubcap@...ibond.com>,
David Wysochanski <dwysocha@...hat.com>,
Shyam Prasad N <nspmangalore@...il.com>,
Miklos Szeredi <miklos@...redi.hu>,
Linus Torvalds <torvalds@...ux-foundation.org>,
linux-cachefs@...hat.com, linux-afs@...ts.infradead.org,
linux-nfs@...r.kernel.org, linux-cifs@...r.kernel.org,
ceph-devel@...r.kernel.org, v9fs-developer@...ts.sourceforge.net,
devel@...ts.orangefs.org, linux-mm@...ck.org,
linux-kernel@...r.kernel.org
Subject: [RFC PATCH 03/12] netfs: Remove netfs_read_subrequest::transferred
Remove netfs_read_subrequest::transferred as it's redundant as the count on
the iterator added to the subrequest can be used instead.
Signed-off-by: David Howells <dhowells@...hat.com>
---
fs/afs/file.c | 4 ++--
fs/netfs/read_helper.c | 26 ++++----------------------
include/linux/netfs.h | 1 -
include/trace/events/netfs.h | 12 ++++++------
4 files changed, 12 insertions(+), 31 deletions(-)
diff --git a/fs/afs/file.c b/fs/afs/file.c
index ca529f23515a..82e945dbe379 100644
--- a/fs/afs/file.c
+++ b/fs/afs/file.c
@@ -315,8 +315,8 @@ static void afs_req_issue_op(struct netfs_read_subrequest *subreq)
return netfs_subreq_terminated(subreq, -ENOMEM, false);
fsreq->subreq = subreq;
- fsreq->pos = subreq->start + subreq->transferred;
- fsreq->len = subreq->len - subreq->transferred;
+ fsreq->pos = subreq->start + subreq->len - iov_iter_count(&subreq->iter);
+ fsreq->len = iov_iter_count(&subreq->iter);
fsreq->key = subreq->rreq->netfs_priv;
fsreq->vnode = vnode;
fsreq->iter = &subreq->iter;
diff --git a/fs/netfs/read_helper.c b/fs/netfs/read_helper.c
index 715f3e9c380d..5e1a9be48130 100644
--- a/fs/netfs/read_helper.c
+++ b/fs/netfs/read_helper.c
@@ -148,12 +148,7 @@ static void __netfs_put_subrequest(struct netfs_read_subrequest *subreq,
*/
static void netfs_clear_unread(struct netfs_read_subrequest *subreq)
{
- struct iov_iter iter;
-
- iov_iter_xarray(&iter, READ, &subreq->rreq->mapping->i_pages,
- subreq->start + subreq->transferred,
- subreq->len - subreq->transferred);
- iov_iter_zero(iov_iter_count(&iter), &iter);
+ iov_iter_zero(iov_iter_count(&subreq->iter), &subreq->iter);
}
static void netfs_cache_read_terminated(void *priv, ssize_t transferred_or_error,
@@ -173,14 +168,9 @@ static void netfs_read_from_cache(struct netfs_read_request *rreq,
bool seek_data)
{
struct netfs_cache_resources *cres = &rreq->cache_resources;
- struct iov_iter iter;
netfs_stat(&netfs_n_rh_read);
- iov_iter_xarray(&iter, READ, &rreq->mapping->i_pages,
- subreq->start + subreq->transferred,
- subreq->len - subreq->transferred);
-
- cres->ops->read(cres, subreq->start, &iter, seek_data,
+ cres->ops->read(cres, subreq->start, &subreq->iter, seek_data,
netfs_cache_read_terminated, subreq);
}
@@ -419,7 +409,7 @@ static void netfs_rreq_unlock(struct netfs_read_request *rreq)
if (pgend < iopos + subreq->len)
break;
- account += subreq->transferred;
+ account += subreq->len - iov_iter_count(&subreq->iter);
iopos += subreq->len;
if (!list_is_last(&subreq->rreq_link, &rreq->subrequests)) {
subreq = list_next_entry(subreq, rreq_link);
@@ -635,15 +625,8 @@ void netfs_subreq_terminated(struct netfs_read_subrequest *subreq,
goto failed;
}
- if (WARN(transferred_or_error > subreq->len - subreq->transferred,
- "Subreq overread: R%x[%x] %zd > %zu - %zu",
- rreq->debug_id, subreq->debug_index,
- transferred_or_error, subreq->len, subreq->transferred))
- transferred_or_error = subreq->len - subreq->transferred;
-
subreq->error = 0;
- subreq->transferred += transferred_or_error;
- if (subreq->transferred < subreq->len)
+ if (iov_iter_count(&subreq->iter))
goto incomplete;
complete:
@@ -667,7 +650,6 @@ void netfs_subreq_terminated(struct netfs_read_subrequest *subreq,
incomplete:
if (test_bit(NETFS_SREQ_CLEAR_TAIL, &subreq->flags)) {
netfs_clear_unread(subreq);
- subreq->transferred = subreq->len;
goto complete;
}
diff --git a/include/linux/netfs.h b/include/linux/netfs.h
index 5e4fafcc9480..45d40c622205 100644
--- a/include/linux/netfs.h
+++ b/include/linux/netfs.h
@@ -116,7 +116,6 @@ struct netfs_read_subrequest {
struct iov_iter iter; /* Iterator for this subrequest */
loff_t start; /* Where to start the I/O */
size_t len; /* Size of the I/O */
- size_t transferred; /* Amount of data transferred */
refcount_t usage;
short error; /* 0 or error that occurred */
unsigned short debug_index; /* Index in list (for debugging output) */
diff --git a/include/trace/events/netfs.h b/include/trace/events/netfs.h
index 4d470bffd9f1..04ac29fc700f 100644
--- a/include/trace/events/netfs.h
+++ b/include/trace/events/netfs.h
@@ -190,7 +190,7 @@ TRACE_EVENT(netfs_sreq,
__field(enum netfs_read_source, source )
__field(enum netfs_sreq_trace, what )
__field(size_t, len )
- __field(size_t, transferred )
+ __field(size_t, remain )
__field(loff_t, start )
),
@@ -202,7 +202,7 @@ TRACE_EVENT(netfs_sreq,
__entry->source = sreq->source;
__entry->what = what;
__entry->len = sreq->len;
- __entry->transferred = sreq->transferred;
+ __entry->remain = iov_iter_count(&sreq->iter);
__entry->start = sreq->start;
),
@@ -211,7 +211,7 @@ TRACE_EVENT(netfs_sreq,
__print_symbolic(__entry->what, netfs_sreq_traces),
__print_symbolic(__entry->source, netfs_sreq_sources),
__entry->flags,
- __entry->start, __entry->transferred, __entry->len,
+ __entry->start, __entry->len - __entry->remain, __entry->len,
__entry->error)
);
@@ -230,7 +230,7 @@ TRACE_EVENT(netfs_failure,
__field(enum netfs_read_source, source )
__field(enum netfs_failure, what )
__field(size_t, len )
- __field(size_t, transferred )
+ __field(size_t, remain )
__field(loff_t, start )
),
@@ -242,7 +242,7 @@ TRACE_EVENT(netfs_failure,
__entry->source = sreq ? sreq->source : NETFS_INVALID_READ;
__entry->what = what;
__entry->len = sreq ? sreq->len : 0;
- __entry->transferred = sreq ? sreq->transferred : 0;
+ __entry->remain = sreq ? iov_iter_count(&sreq->iter) : 0;
__entry->start = sreq ? sreq->start : 0;
),
@@ -250,7 +250,7 @@ TRACE_EVENT(netfs_failure,
__entry->rreq, __entry->index,
__print_symbolic(__entry->source, netfs_sreq_sources),
__entry->flags,
- __entry->start, __entry->transferred, __entry->len,
+ __entry->start, __entry->len - __entry->remain, __entry->len,
__print_symbolic(__entry->what, netfs_failures),
__entry->error)
);
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