[PATCH 12/17] netfs: Move max_len/max_nr_segs from netfs_io_subrequest to netfs_io_stream

David Howells
2024-06-20T17:33:34Z

Move max_len/max_nr_segs from struct netfs_io_subrequest to struct
netfs_io_stream as we only issue one subreq at a time and then don't need
these values again for that subreq unless and until we have to retry it -
in which case we want to renegotiate them.

Signed-off-by: David Howells <dhowells@redhat.com>
cc: Jeff Layton <jlayton@kernel.org>
cc: netfs@lists.linux.dev
cc: linux-fsdevel@vger.kernel.org
---
fs/afs/write.c | 4 +++-
fs/cachefiles/io.c | 5 +++--
fs/netfs/io.c | 4 ++--
fs/netfs/write_collect.c | 10 +++++-----
fs/netfs/write_issue.c | 14 +++++++-------
fs/smb/client/file.c | 15 ++++++++-------
include/linux/netfs.h | 4 ++--
7 files changed, 30 insertions(+), 26 deletions(-)

diff --git a/fs/afs/write.c b/fs/afs/write.c
index e959640694c2..34107b55f834 100644
--- a/fs/afs/write.c
+++ b/fs/afs/write.c
@@ -89,10 +89,12 @@ static const struct afs_operation_ops afs_store_data_operation = {
*/
void afs_prepare_write(struct netfs_io_subrequest *subreq)
{
+ struct netfs_io_stream *stream = &subreq->rreq->io_streams[subreq->stream_nr];
+
//if (test_bit(NETFS_SREQ_RETRYING, &subreq->flags))
// subreq->max_len = 512 * 1024;
//else
- subreq->max_len = 256 * 1024 * 1024;
+ stream->sreq_max_len = 256 * 1024 * 1024;
}

/*
diff --git a/fs/cachefiles/io.c b/fs/cachefiles/io.c
index e667dbcd20e8..a32f442b559b 100644
--- a/fs/cachefiles/io.c
+++ b/fs/cachefiles/io.c
@@ -627,11 +627,12 @@ static void cachefiles_prepare_write_subreq(struct netfs_io_subrequest *subreq)
{
struct netfs_io_request *wreq = subreq->rreq;
struct netfs_cache_resources *cres = &wreq->cache_resources;
+ struct netfs_io_stream *stream = &wreq->io_streams[subreq->stream_nr];

_enter("W=%x[%x] %llx", wreq->debug_id, subreq->debug_index, subreq->start);

- subreq->max_len = ULONG_MAX;
- subreq->max_nr_segs = BIO_MAX_VECS;
+ stream->sreq_max_len = UINT_MAX;
+ stream->sreq_max_segs = BIO_MAX_VECS;

if (!cachefiles_cres_file(cres)) {
if (!fscache_wait_for_operation(cres, FSCACHE_WANT_WRITE))
diff --git a/fs/netfs/io.c b/fs/netfs/io.c
index c93851b98368..27dbea0f3867 100644
--- a/fs/netfs/io.c
+++ b/fs/netfs/io.c
@@ -469,9 +469,9 @@ netfs_rreq_prepare_read(struct netfs_io_request *rreq,
goto out;
}

- if (subreq->max_nr_segs) {
+ if (rreq->io_streams[0].sreq_max_segs) {
lsize = netfs_limit_iter(io_iter, 0, subreq->len,
- subreq->max_nr_segs);
+ rreq->io_streams[0].sreq_max_segs);
if (subreq->len > lsize) {
subreq->len = lsize;
trace_netfs_sreq(subreq, netfs_sreq_trace_limited);
diff --git a/fs/netfs/write_collect.c b/fs/netfs/write_collect.c
index 426cf87aaf2e..e105ac270090 100644
--- a/fs/netfs/write_collect.c
+++ b/fs/netfs/write_collect.c
@@ -231,7 +231,7 @@ static void netfs_retry_write_stream(struct netfs_io_request *wreq,
__set_bit(NETFS_SREQ_RETRYING, &subreq->flags);
stream->prepare_write(subreq);

- part = min(len, subreq->max_len);
+ part = min(len, stream->sreq_max_len);
subreq->len = part;
subreq->start = start;
subreq->transferred = 0;
@@ -271,8 +271,6 @@ static void netfs_retry_write_stream(struct netfs_io_request *wreq,
subreq = netfs_alloc_subrequest(wreq);
subreq->source = to->source;
subreq->start = start;
- subreq->max_len = len;
- subreq->max_nr_segs = INT_MAX;
subreq->debug_index = atomic_inc_return(&wreq->subreq_counter);
subreq->stream_nr = to->stream_nr;
__set_bit(NETFS_SREQ_RETRYING, &subreq->flags);
@@ -286,10 +284,12 @@ static void netfs_retry_write_stream(struct netfs_io_request *wreq,
to = list_next_entry(to, rreq_link);
trace_netfs_sreq(subreq, netfs_sreq_trace_retry);

+ stream->sreq_max_len = len;
+ stream->sreq_max_segs = INT_MAX;
switch (stream->source) {
case NETFS_UPLOAD_TO_SERVER:
netfs_stat(&netfs_n_wh_upload);
- subreq->max_len = min(len, wreq->wsize);
+ stream->sreq_max_len = umin(len, wreq->wsize);
break;
case NETFS_WRITE_TO_CACHE:
netfs_stat(&netfs_n_wh_write);
@@ -300,7 +300,7 @@ static void netfs_retry_write_stream(struct netfs_io_request *wreq,

stream->prepare_write(subreq);

- part = min(len, subreq->max_len);
+ part = umin(len, stream->sreq_max_len);
subreq->len = subreq->transferred + part;
len -= part;
start += part;
diff --git a/fs/netfs/write_issue.c b/fs/netfs/write_issue.c
index cd3ddf07ab49..c87e72a3b16d 100644
--- a/fs/netfs/write_issue.c
+++ b/fs/netfs/write_issue.c
@@ -155,8 +155,6 @@ static void netfs_prepare_write(struct netfs_io_request *wreq,
subreq = netfs_alloc_subrequest(wreq);
subreq->source = stream->source;
subreq->start = start;
- subreq->max_len = ULONG_MAX;
- subreq->max_nr_segs = INT_MAX;
subreq->stream_nr = stream->stream_nr;

_enter("R=%x[%x]", wreq->debug_id, subreq->debug_index);
@@ -167,10 +165,12 @@ static void netfs_prepare_write(struct netfs_io_request *wreq,

trace_netfs_sreq(subreq, netfs_sreq_trace_prepare);

+ stream->sreq_max_len = UINT_MAX;
+ stream->sreq_max_segs = INT_MAX;
switch (stream->source) {
case NETFS_UPLOAD_TO_SERVER:
netfs_stat(&netfs_n_wh_upload);
- subreq->max_len = wreq->wsize;
+ stream->sreq_max_len = wreq->wsize;
break;
case NETFS_WRITE_TO_CACHE:
netfs_stat(&netfs_n_wh_write);
@@ -287,13 +287,13 @@ int netfs_advance_write(struct netfs_io_request *wreq,
netfs_prepare_write(wreq, stream, start);
subreq = stream->construct;

- part = min(subreq->max_len - subreq->len, len);
- _debug("part %zx/%zx %zx/%zx", subreq->len, subreq->max_len, part, len);
+ part = umin(stream->sreq_max_len - subreq->len, len);
+ _debug("part %zx/%zx %zx/%zx", subreq->len, stream->sreq_max_len, part, len);
subreq->len += part;
subreq->nr_segs++;

- if (subreq->len >= subreq->max_len ||
- subreq->nr_segs >= subreq->max_nr_segs ||
+ if (subreq->len >= stream->sreq_max_len ||
+ subreq->nr_segs >= stream->sreq_max_segs ||
to_eof) {
netfs_issue_write(wreq, stream);
subreq = NULL;
diff --git a/fs/smb/client/file.c b/fs/smb/client/file.c
index 45c860f0e7fd..4732c63f7531 100644
--- a/fs/smb/client/file.c
+++ b/fs/smb/client/file.c
@@ -49,6 +49,7 @@ static void cifs_prepare_write(struct netfs_io_subrequest *subreq)
struct cifs_io_subrequest *wdata =
container_of(subreq, struct cifs_io_subrequest, subreq);
struct cifs_io_request *req = wdata->req;
+ struct netfs_io_stream *stream = &req->rreq.io_streams[subreq->stream_nr];
struct TCP_Server_Info *server;
struct cifsFileInfo *open_file = req->cfile;
size_t wsize = req->rreq.wsize;
@@ -73,7 +74,7 @@ static void cifs_prepare_write(struct netfs_io_subrequest *subreq)
}
}

- rc = server->ops->wait_mtu_credits(server, wsize, &wdata->subreq.max_len,
+ rc = server->ops->wait_mtu_credits(server, wsize, &stream->sreq_max_len,
&wdata->credits);
if (rc < 0) {
subreq->error = rc;
@@ -82,7 +83,7 @@ static void cifs_prepare_write(struct netfs_io_subrequest *subreq)

#ifdef CONFIG_CIFS_SMB_DIRECT
if (server->smbd_conn)
- subreq->max_nr_segs = server->smbd_conn->max_frmr_depth;
+ stream->sreq_max_segs = server->smbd_conn->max_frmr_depth;
#endif
}

@@ -134,11 +135,11 @@ static void cifs_issue_write(struct netfs_io_subrequest *subreq)
static bool cifs_clamp_length(struct netfs_io_subrequest *subreq)
{
struct netfs_io_request *rreq = subreq->rreq;
+ struct netfs_io_stream *stream = &rreq->io_streams[subreq->stream_nr];
struct cifs_io_subrequest *rdata = container_of(subreq, struct cifs_io_subrequest, subreq);
struct cifs_io_request *req = container_of(subreq->rreq, struct cifs_io_request, rreq);
struct TCP_Server_Info *server = req->server;
struct cifs_sb_info *cifs_sb = CIFS_SB(rreq->inode->i_sb);
- size_t rsize = 0;
int rc;

rdata->xid = get_xid();
@@ -151,17 +152,17 @@ static bool cifs_clamp_length(struct netfs_io_subrequest *subreq)
cifs_sb->ctx);

- rc = server->ops->wait_mtu_credits(server, cifs_sb->ctx->rsize, &rsize,
- &rdata->credits);
+ rc = server->ops->wait_mtu_credits(server, cifs_sb->ctx->rsize,
+ &stream->sreq_max_len, &rdata->credits);
if (rc) {
subreq->error = rc;
return false;
}

- subreq->len = min_t(size_t, subreq->len, rsize);
+ subreq->len = umin(subreq->len, stream->sreq_max_len);
#ifdef CONFIG_CIFS_SMB_DIRECT
if (server->smbd_conn)
- subreq->max_nr_segs = server->smbd_conn->max_frmr_depth;
+ stream->sreq_max_segs = server->smbd_conn->max_frmr_depth;
#endif
return true;
}
diff --git a/include/linux/netfs.h b/include/linux/netfs.h
index 2d438aaae685..aada40d2182b 100644
--- a/include/linux/netfs.h
+++ b/include/linux/netfs.h
@@ -136,6 +136,8 @@ static inline struct netfs_group *netfs_folio_group(struct folio *folio)
struct netfs_io_stream {
/* Submission tracking */
struct netfs_io_subrequest *construct; /* Op being constructed */
+ size_t sreq_max_len; /* Maximum size of a subrequest */
+ unsigned int sreq_max_segs; /* 0 or max number of segments in an iterator */
unsigned int submit_off; /* Folio offset we're submitting from */
unsigned int submit_len; /* Amount of data left to submit */
unsigned int submit_max_len; /* Amount I/O can be rounded up to */
@@ -179,14 +181,12 @@ struct netfs_io_subrequest {
struct list_head rreq_link; /* Link in rreq->subrequests */
struct iov_iter io_iter; /* Iterator for this subrequest */
unsigned long long start; /* Where to start the I/O */
- size_t max_len; /* Maximum size of the I/O */
size_t len; /* Size of the I/O */
size_t transferred; /* Amount of data transferred */
refcount_t ref;
short error; /* 0 or error that occurred */
unsigned short debug_index; /* Index in list (for debugging output) */
unsigned int nr_segs; /* Number of segs in io_iter */
- unsigned int max_nr_segs; /* 0 or max number of segments in an iterator */
enum netfs_io_source source; /* Where to read from/write to */
unsigned char stream_nr; /* I/O stream this belongs to */
unsigned long flags;