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Date: Thu, 10 Mar 2022 16:17:21 +0000
From: David Howells <dhowells@...hat.com>
To: linux-cachefs@...hat.com
Cc: Jeff Layton <jlayton@...nel.org>, dhowells@...hat.com,
Anna Schumaker <anna.schumaker@...app.com>,
Steve French <sfrench@...ba.org>,
Dominique Martinet <asmadeus@...ewreck.org>,
Jeff Layton <jlayton@...hat.com>,
David Wysochanski <dwysocha@...hat.com>,
Ilya Dryomov <idryomov@...il.com>,
Jeffle Xu <jefflexu@...ux.alibaba.com>,
Linus Torvalds <torvalds@...ux-foundation.org>,
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,
linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v3 10/20] netfs: Refactor arguments for
netfs_alloc_read_request
Pass start and len to the rreq allocator. This should ensure that the
fields are set so that ->init_request() can use them.
Also add a parameter to indicates the origin of the request. Ceph can use
this to tell whether to get caps.
Changes
=======
ver #3)
- Change the author to me as Jeff feels that most of the patch is my
changes now.
ver #2)
- Show the request origin in the netfs_rreq tracepoint.
Signed-off-by: Jeff Layton <jlayton@...nel.org>
Co-developed-by: David Howells <dhowells@...hat.com>
Signed-off-by: David Howells <dhowells@...hat.com>
cc: linux-cachefs@...hat.com
Link: https://lore.kernel.org/r/164622989020.3564931.17517006047854958747.stgit@warthog.procyon.org.uk/ # v1
Link: https://lore.kernel.org/r/164678208569.1200972.12153682697842916557.stgit@warthog.procyon.org.uk/ # v2
---
fs/netfs/internal.h | 7 +++++--
fs/netfs/objects.c | 13 ++++++++++---
fs/netfs/read_helper.c | 23 +++++++++++------------
include/linux/netfs.h | 7 +++++++
include/trace/events/netfs.h | 11 ++++++++++-
5 files changed, 43 insertions(+), 18 deletions(-)
diff --git a/fs/netfs/internal.h b/fs/netfs/internal.h
index a0b7d1bf9f3d..89837e904fa7 100644
--- a/fs/netfs/internal.h
+++ b/fs/netfs/internal.h
@@ -17,9 +17,12 @@
/*
* objects.c
*/
-struct netfs_io_request *netfs_alloc_request(const struct netfs_request_ops *ops,
+struct netfs_io_request *netfs_alloc_request(struct address_space *mapping,
+ struct file *file,
+ const struct netfs_request_ops *ops,
void *netfs_priv,
- struct file *file);
+ loff_t start, size_t len,
+ enum netfs_io_origin origin);
void netfs_get_request(struct netfs_io_request *rreq, enum netfs_rreq_ref_trace what);
void netfs_clear_subrequests(struct netfs_io_request *rreq, bool was_async);
void netfs_put_request(struct netfs_io_request *rreq, bool was_async,
diff --git a/fs/netfs/objects.c b/fs/netfs/objects.c
index 39097893e847..986d7a9d25dd 100644
--- a/fs/netfs/objects.c
+++ b/fs/netfs/objects.c
@@ -11,17 +11,24 @@
/*
* Allocate an I/O request and initialise it.
*/
-struct netfs_io_request *netfs_alloc_request(
- const struct netfs_request_ops *ops, void *netfs_priv,
- struct file *file)
+struct netfs_io_request *netfs_alloc_request(struct address_space *mapping,
+ struct file *file,
+ const struct netfs_request_ops *ops,
+ void *netfs_priv,
+ loff_t start, size_t len,
+ enum netfs_io_origin origin)
{
static atomic_t debug_ids;
struct netfs_io_request *rreq;
rreq = kzalloc(sizeof(struct netfs_io_request), GFP_KERNEL);
if (rreq) {
+ rreq->start = start;
+ rreq->len = len;
+ rreq->origin = origin;
rreq->netfs_ops = ops;
rreq->netfs_priv = netfs_priv;
+ rreq->mapping = mapping;
rreq->inode = file_inode(file);
rreq->i_size = i_size_read(rreq->inode);
rreq->debug_id = atomic_inc_return(&debug_ids);
diff --git a/fs/netfs/read_helper.c b/fs/netfs/read_helper.c
index 8f277da487b6..dea085715286 100644
--- a/fs/netfs/read_helper.c
+++ b/fs/netfs/read_helper.c
@@ -763,12 +763,13 @@ void netfs_readahead(struct readahead_control *ractl,
if (readahead_count(ractl) == 0)
goto cleanup;
- rreq = netfs_alloc_request(ops, netfs_priv, ractl->file);
+ rreq = netfs_alloc_request(ractl->mapping, ractl->file,
+ ops, netfs_priv,
+ readahead_pos(ractl),
+ readahead_length(ractl),
+ NETFS_READAHEAD);
if (!rreq)
goto cleanup;
- rreq->mapping = ractl->mapping;
- rreq->start = readahead_pos(ractl);
- rreq->len = readahead_length(ractl);
if (ops->begin_cache_operation) {
ret = ops->begin_cache_operation(rreq);
@@ -838,16 +839,15 @@ int netfs_readpage(struct file *file,
_enter("%lx", folio_index(folio));
- rreq = netfs_alloc_request(ops, netfs_priv, file);
+ rreq = netfs_alloc_request(folio->mapping, file, ops, netfs_priv,
+ folio_file_pos(folio), folio_size(folio),
+ NETFS_READPAGE);
if (!rreq) {
if (netfs_priv)
ops->cleanup(folio_file_mapping(folio), netfs_priv);
folio_unlock(folio);
return -ENOMEM;
}
- rreq->mapping = folio_file_mapping(folio);
- rreq->start = folio_file_pos(folio);
- rreq->len = folio_size(folio);
if (ops->begin_cache_operation) {
ret = ops->begin_cache_operation(rreq);
@@ -1008,12 +1008,11 @@ int netfs_write_begin(struct file *file, struct address_space *mapping,
}
ret = -ENOMEM;
- rreq = netfs_alloc_request(ops, netfs_priv, file);
+ rreq = netfs_alloc_request(mapping, file, ops, netfs_priv,
+ folio_file_pos(folio), folio_size(folio),
+ NETFS_READ_FOR_WRITE);
if (!rreq)
goto error;
- rreq->mapping = folio_file_mapping(folio);
- rreq->start = folio_file_pos(folio);
- rreq->len = folio_size(folio);
rreq->no_unlock_folio = folio_index(folio);
__set_bit(NETFS_RREQ_NO_UNLOCK_FOLIO, &rreq->flags);
netfs_priv = NULL;
diff --git a/include/linux/netfs.h b/include/linux/netfs.h
index c702bd8ea8da..7dc741d9b21b 100644
--- a/include/linux/netfs.h
+++ b/include/linux/netfs.h
@@ -150,6 +150,12 @@ struct netfs_io_subrequest {
#define NETFS_SREQ_NO_PROGRESS 4 /* Set if we didn't manage to read any data */
};
+enum netfs_io_origin {
+ NETFS_READAHEAD, /* This read was triggered by readahead */
+ NETFS_READPAGE, /* This read is a synchronous read */
+ NETFS_READ_FOR_WRITE, /* This read is to prepare a write */
+} __mode(byte);
+
/*
* Descriptor for an I/O helper request. This is used to make multiple I/O
* operations to a variety of data stores and then stitch the result together.
@@ -167,6 +173,7 @@ struct netfs_io_request {
size_t submitted; /* Amount submitted for I/O so far */
size_t len; /* Length of the request */
short error; /* 0 or error that occurred */
+ enum netfs_io_origin origin; /* Origin of the request */
loff_t i_size; /* Size of the file */
loff_t start; /* Start position */
pgoff_t no_unlock_folio; /* Don't unlock this folio after read */
diff --git a/include/trace/events/netfs.h b/include/trace/events/netfs.h
index 556859b0f107..f00e3e1821c8 100644
--- a/include/trace/events/netfs.h
+++ b/include/trace/events/netfs.h
@@ -21,6 +21,11 @@
EM(netfs_read_trace_readpage, "READPAGE ") \
E_(netfs_read_trace_write_begin, "WRITEBEGN")
+#define netfs_rreq_origins \
+ EM(NETFS_READAHEAD, "RA") \
+ EM(NETFS_READPAGE, "RP") \
+ E_(NETFS_READ_FOR_WRITE, "RW")
+
#define netfs_rreq_traces \
EM(netfs_rreq_trace_assess, "ASSESS ") \
EM(netfs_rreq_trace_copy, "COPY ") \
@@ -101,6 +106,7 @@ enum netfs_sreq_ref_trace { netfs_sreq_ref_traces } __mode(byte);
#define E_(a, b) TRACE_DEFINE_ENUM(a);
netfs_read_traces;
+netfs_rreq_origins;
netfs_rreq_traces;
netfs_sreq_sources;
netfs_sreq_traces;
@@ -159,17 +165,20 @@ TRACE_EVENT(netfs_rreq,
TP_STRUCT__entry(
__field(unsigned int, rreq )
__field(unsigned int, flags )
+ __field(enum netfs_io_origin, origin )
__field(enum netfs_rreq_trace, what )
),
TP_fast_assign(
__entry->rreq = rreq->debug_id;
__entry->flags = rreq->flags;
+ __entry->origin = rreq->origin;
__entry->what = what;
),
- TP_printk("R=%08x %s f=%02x",
+ TP_printk("R=%08x %s %s f=%02x",
__entry->rreq,
+ __print_symbolic(__entry->origin, netfs_rreq_origins),
__print_symbolic(__entry->what, netfs_rreq_traces),
__entry->flags)
);
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