From: David Howells <dhowells@redhat.com>
To: Christian Brauner <christian@brauner.io>,
Jeff Layton <jlayton@kernel.org>,
Gao Xiang <hsiangkao@linux.alibaba.com>,
Dominique Martinet <asmadeus@codewreck.org>
Cc: David Howells <dhowells@redhat.com>,
Matthew Wilcox <willy@infradead.org>,
Steve French <smfrench@gmail.com>,
Marc Dionne <marc.dionne@auristor.com>,
Paulo Alcantara <pc@manguebit.com>,
Shyam Prasad N <sprasad@microsoft.com>,
Tom Talpey <tom@talpey.com>,
Eric Van Hensbergen <ericvh@kernel.org>,
Ilya Dryomov <idryomov@gmail.com>,
netfs@lists.linux.dev, linux-cachefs@redhat.com,
linux-afs@lists.infradead.org, linux-cifs@vger.kernel.org,
linux-nfs@vger.kernel.org, ceph-devel@vger.kernel.org,
v9fs@lists.linux.dev, linux-erofs@lists.ozlabs.org,
linux-fsdevel@vger.kernel.org, linux-mm@kvack.org,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH v2 18/22] netfs, cachefiles: Implement helpers for new write code
Date: Tue, 30 Apr 2024 15:00:49 +0100 [thread overview]
Message-ID: <20240430140056.261997-19-dhowells@redhat.com> (raw)
In-Reply-To: <20240430140056.261997-1-dhowells@redhat.com>
Implement the helpers for the new write code in cachefiles. There's now an
optional ->prepare_write() that allows the filesystem to set the parameters
for the next write, such as maximum size and maximum segment count, and an
->issue_write() that is called to initiate an (asynchronous) write
operation.
Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
cc: netfs@lists.linux.dev
cc: linux-erofs@lists.ozlabs.org
cc: linux-fsdevel@vger.kernel.org
---
Notes:
Changes
=======
ver #2)
- Add missing linux/bio.h for BIO_MAX_VECS.
fs/cachefiles/io.c | 74 ++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 74 insertions(+)
diff --git a/fs/cachefiles/io.c b/fs/cachefiles/io.c
index 5ba5c7814fe4..e667dbcd20e8 100644
--- a/fs/cachefiles/io.c
+++ b/fs/cachefiles/io.c
@@ -9,6 +9,7 @@
#include <linux/slab.h>
#include <linux/file.h>
#include <linux/uio.h>
+#include <linux/bio.h>
#include <linux/falloc.h>
#include <linux/sched/mm.h>
#include <trace/events/fscache.h>
@@ -622,6 +623,77 @@ static int cachefiles_prepare_write(struct netfs_cache_resources *cres,
return ret;
}
+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;
+
+ _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;
+
+ if (!cachefiles_cres_file(cres)) {
+ if (!fscache_wait_for_operation(cres, FSCACHE_WANT_WRITE))
+ return netfs_prepare_write_failed(subreq);
+ if (!cachefiles_cres_file(cres))
+ return netfs_prepare_write_failed(subreq);
+ }
+}
+
+static void cachefiles_issue_write(struct netfs_io_subrequest *subreq)
+{
+ struct netfs_io_request *wreq = subreq->rreq;
+ struct netfs_cache_resources *cres = &wreq->cache_resources;
+ struct cachefiles_object *object = cachefiles_cres_object(cres);
+ struct cachefiles_cache *cache = object->volume->cache;
+ const struct cred *saved_cred;
+ size_t off, pre, post, len = subreq->len;
+ loff_t start = subreq->start;
+ int ret;
+
+ _enter("W=%x[%x] %llx-%llx",
+ wreq->debug_id, subreq->debug_index, start, start + len - 1);
+
+ /* We need to start on the cache granularity boundary */
+ off = start & (CACHEFILES_DIO_BLOCK_SIZE - 1);
+ if (off) {
+ pre = CACHEFILES_DIO_BLOCK_SIZE - off;
+ if (pre >= len) {
+ netfs_write_subrequest_terminated(subreq, len, false);
+ return;
+ }
+ subreq->transferred += pre;
+ start += pre;
+ len -= pre;
+ iov_iter_advance(&subreq->io_iter, pre);
+ }
+
+ /* We also need to end on the cache granularity boundary */
+ post = len & (CACHEFILES_DIO_BLOCK_SIZE - 1);
+ if (post) {
+ len -= post;
+ if (len == 0) {
+ netfs_write_subrequest_terminated(subreq, post, false);
+ return;
+ }
+ iov_iter_truncate(&subreq->io_iter, len);
+ }
+
+ cachefiles_begin_secure(cache, &saved_cred);
+ ret = __cachefiles_prepare_write(object, cachefiles_cres_file(cres),
+ &start, &len, len, true);
+ cachefiles_end_secure(cache, saved_cred);
+ if (ret < 0) {
+ netfs_write_subrequest_terminated(subreq, ret, false);
+ return;
+ }
+
+ cachefiles_write(&subreq->rreq->cache_resources,
+ subreq->start, &subreq->io_iter,
+ netfs_write_subrequest_terminated, subreq);
+}
+
/*
* Clean up an operation.
*/
@@ -638,8 +710,10 @@ static const struct netfs_cache_ops cachefiles_netfs_cache_ops = {
.end_operation = cachefiles_end_operation,
.read = cachefiles_read,
.write = cachefiles_write,
+ .issue_write = cachefiles_issue_write,
.prepare_read = cachefiles_prepare_read,
.prepare_write = cachefiles_prepare_write,
+ .prepare_write_subreq = cachefiles_prepare_write_subreq,
.prepare_ondemand_read = cachefiles_prepare_ondemand_read,
.query_occupancy = cachefiles_query_occupancy,
};
next prev parent reply other threads:[~2024-04-30 14:03 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-30 14:00 [PATCH v2 00/22] netfs, afs, 9p, cifs: Rework netfs to use ->writepages() to copy to cache David Howells
2024-04-30 14:00 ` [PATCH v2 01/22] netfs: Update i_blocks when write committed to pagecache David Howells
2024-04-30 14:00 ` [PATCH v2 02/22] netfs: Replace PG_fscache by setting folio->private and marking dirty David Howells
2024-04-30 14:00 ` [PATCH v2 03/22] mm: Remove the PG_fscache alias for PG_private_2 David Howells
2024-04-30 14:00 ` [PATCH v2 04/22] netfs: Remove deprecated use of PG_private_2 as a second writeback flag David Howells
2024-04-30 14:00 ` [PATCH v2 05/22] netfs: Make netfs_io_request::subreq_counter an atomic_t David Howells
2024-04-30 14:00 ` [PATCH v2 06/22] netfs: Use subreq_counter to allocate subreq debug_index values David Howells
2024-04-30 14:00 ` [PATCH v2 07/22] mm: Provide a means of invalidation without using launder_folio David Howells
2024-05-01 4:41 ` Christoph Hellwig
2024-04-30 14:00 ` [PATCH v2 08/22] 9p: Use alternative invalidation to " David Howells
2024-04-30 14:00 ` [PATCH v2 09/22] afs: " David Howells
2024-04-30 14:00 ` [PATCH v2 10/22] netfs: Remove ->launder_folio() support David Howells
2024-04-30 14:00 ` [PATCH v2 11/22] netfs: Use mempools for allocating requests and subrequests David Howells
2024-04-30 14:00 ` [PATCH v2 12/22] mm: Export writeback_iter() David Howells
2024-04-30 14:00 ` [PATCH v2 13/22] netfs: Switch to using unsigned long long rather than loff_t David Howells
2024-04-30 14:00 ` [PATCH v2 14/22] netfs: New writeback implementation David Howells
2024-04-30 14:00 ` [PATCH v2 15/22] netfs: Add some write-side stats and clean up some stat names David Howells
2024-04-30 14:00 ` [PATCH v2 16/22] netfs, afs: Implement helpers for new write code David Howells
2024-04-30 14:00 ` [PATCH v2 17/22] netfs, 9p: " David Howells
2024-04-30 14:00 ` David Howells [this message]
2024-04-30 14:00 ` [PATCH v2 19/22] netfs: Cut over to using new writeback code David Howells
2024-04-30 14:00 ` [PATCH v2 20/22] netfs: Remove the old " David Howells
2024-04-30 14:00 ` [PATCH v2 21/22] netfs: Miscellaneous tidy ups David Howells
2024-04-30 14:00 ` [PATCH v2 22/22] netfs, afs: Use writeback retry to deal with alternate keys David Howells
2024-05-01 11:51 ` [PATCH v2 07/22] mm: Provide a means of invalidation without using launder_folio David Howells
2024-05-01 17:00 ` [PATCH v2 14/22] netfs: New writeback implementation David Howells
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