From: David Howells <dhowells@redhat.com>
To: Trond Myklebust <trondmy@hammerspace.com>,
Anna Schumaker <anna.schumaker@netapp.com>,
Steve French <sfrench@samba.org>,
Dominique Martinet <asmadeus@codewreck.org>
Cc: dhowells@redhat.com, Jeff Layton <jlayton@redhat.com>,
David Wysochanski <dwysocha@redhat.com>,
Matthew Wilcox <willy@infradead.org>,
Alexander Viro <viro@zeniv.linux.org.uk>,
linux-cachefs@redhat.com, linux-afs@lists.infradead.org,
linux-nfs@vger.kernel.org, linux-cifs@vger.kernel.org,
ceph-devel@vger.kernel.org, v9fs-developer@lists.sourceforge.net,
linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH 21/32] afs: Extract writeback extension into its own function
Date: Mon, 25 Jan 2021 21:35:05 +0000 [thread overview]
Message-ID: <161161050546.2537118.2202554806419189453.stgit@warthog.procyon.org.uk> (raw)
In-Reply-To: <161161025063.2537118.2009249444682241405.stgit@warthog.procyon.org.uk>
Extract writeback extension into its own function to break up the writeback
function a bit.
Signed-off-by: David Howells <dhowells@redhat.com>
---
fs/afs/write.c | 109 ++++++++++++++++++++++++++++++++++----------------------
1 file changed, 67 insertions(+), 42 deletions(-)
diff --git a/fs/afs/write.c b/fs/afs/write.c
index e1791de90478..89c804bfe253 100644
--- a/fs/afs/write.c
+++ b/fs/afs/write.c
@@ -490,47 +490,25 @@ static int afs_store_data(struct afs_vnode *vnode, struct iov_iter *iter,
}
/*
- * Synchronously write back the locked page and any subsequent non-locked dirty
- * pages.
+ * Extend the region to be written back to include subsequent contiguously
+ * dirty pages if possible, but don't sleep while doing so.
+ *
+ * If this page holds new content, then we can include filler zeros in the
+ * writeback.
*/
-static int afs_write_back_from_locked_page(struct address_space *mapping,
- struct writeback_control *wbc,
- struct page *primary_page,
- pgoff_t final_page)
+static void afs_extend_writeback(struct address_space *mapping,
+ struct afs_vnode *vnode,
+ long *_count,
+ pgoff_t start,
+ pgoff_t final_page,
+ unsigned *_offset,
+ unsigned *_to,
+ bool new_content)
{
- struct afs_vnode *vnode = AFS_FS_I(mapping->host);
- struct iov_iter iter;
struct page *pages[8], *page;
- unsigned long count, priv;
- unsigned n, offset, to, f, t;
- pgoff_t start, first, last;
- loff_t i_size, pos, end;
- int loop, ret;
-
- _enter(",%lx", primary_page->index);
-
- count = 1;
- if (test_set_page_writeback(primary_page))
- BUG();
-
- /* Find all consecutive lockable dirty pages that have contiguous
- * written regions, stopping when we find a page that is not
- * immediately lockable, is not dirty or is missing, or we reach the
- * end of the range.
- */
- start = primary_page->index;
- priv = page_private(primary_page);
- offset = afs_page_dirty_from(primary_page, priv);
- to = afs_page_dirty_to(primary_page, priv);
- trace_afs_page_dirty(vnode, tracepoint_string("store"), primary_page);
-
- WARN_ON(offset == to);
- if (offset == to)
- trace_afs_page_dirty(vnode, tracepoint_string("WARN"), primary_page);
-
- if (start >= final_page ||
- (to < PAGE_SIZE && !test_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags)))
- goto no_more;
+ unsigned long count = *_count, priv;
+ unsigned offset = *_offset, to = *_to, n, f, t;
+ int loop;
start++;
do {
@@ -551,8 +529,7 @@ static int afs_write_back_from_locked_page(struct address_space *mapping,
for (loop = 0; loop < n; loop++) {
page = pages[loop];
- if (to != PAGE_SIZE &&
- !test_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags))
+ if (to != PAGE_SIZE && !new_content)
break;
if (page->index > final_page)
break;
@@ -566,8 +543,7 @@ static int afs_write_back_from_locked_page(struct address_space *mapping,
priv = page_private(page);
f = afs_page_dirty_from(page, priv);
t = afs_page_dirty_to(page, priv);
- if (f != 0 &&
- !test_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags)) {
+ if (f != 0 && !new_content) {
unlock_page(page);
break;
}
@@ -593,6 +569,55 @@ static int afs_write_back_from_locked_page(struct address_space *mapping,
} while (start <= final_page && count < 65536);
no_more:
+ *_count = count;
+ *_offset = offset;
+ *_to = to;
+}
+
+/*
+ * Synchronously write back the locked page and any subsequent non-locked dirty
+ * pages.
+ */
+static int afs_write_back_from_locked_page(struct address_space *mapping,
+ struct writeback_control *wbc,
+ struct page *primary_page,
+ pgoff_t final_page)
+{
+ struct afs_vnode *vnode = AFS_FS_I(mapping->host);
+ struct iov_iter iter;
+ unsigned long count, priv;
+ unsigned offset, to;
+ pgoff_t start, first, last;
+ loff_t i_size, pos, end;
+ bool new_content = test_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags);
+ int ret;
+
+ _enter(",%lx", primary_page->index);
+
+ count = 1;
+ if (test_set_page_writeback(primary_page))
+ BUG();
+
+ /* Find all consecutive lockable dirty pages that have contiguous
+ * written regions, stopping when we find a page that is not
+ * immediately lockable, is not dirty or is missing, or we reach the
+ * end of the range.
+ */
+ start = primary_page->index;
+ priv = page_private(primary_page);
+ offset = afs_page_dirty_from(primary_page, priv);
+ to = afs_page_dirty_to(primary_page, priv);
+ trace_afs_page_dirty(vnode, tracepoint_string("store"), primary_page);
+
+ WARN_ON(offset == to);
+ if (offset == to)
+ trace_afs_page_dirty(vnode, tracepoint_string("WARN"), primary_page);
+
+ if (start < final_page &&
+ (to == PAGE_SIZE || new_content))
+ afs_extend_writeback(mapping, vnode, &count, start, final_page,
+ &offset, &to, new_content);
+
/* We now have a contiguous set of dirty pages, each with writeback
* set; the first page is still locked at this point, but all the rest
* have been unlocked.
next prev parent reply other threads:[~2021-01-25 22:34 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-25 21:30 [PATCH 00/32] Network fs helper library & fscache kiocb API [ver #2] David Howells
2021-01-25 21:31 ` [PATCH 01/32] iov_iter: Add ITER_XARRAY David Howells
2021-01-25 21:31 ` [PATCH 02/32] vm: Add wait/unlock functions for PG_fscache David Howells
2021-01-25 21:31 ` [PATCH 03/32] mm: Implement readahead_control pageset expansion David Howells
2021-01-25 21:31 ` [PATCH 04/32] vfs: Export rw_verify_area() for use by cachefiles David Howells
2021-01-25 21:31 ` [PATCH 05/32] netfs: Make a netfs helper module David Howells
2021-01-25 21:32 ` [PATCH 06/32] netfs: Provide readahead and readpage netfs helpers David Howells
2021-01-25 21:32 ` [PATCH 07/32] netfs: Add tracepoints David Howells
2021-01-25 21:32 ` [PATCH 08/32] netfs: Gather stats David Howells
2021-01-25 21:32 ` [PATCH 09/32] netfs: Add write_begin helper David Howells
2021-01-25 21:32 ` [PATCH 10/32] netfs: Define an interface to talk to a cache David Howells
2021-01-25 21:32 ` [PATCH 11/32] fscache, cachefiles: Add alternate API to use kiocb for read/write to cache David Howells
2021-01-25 21:33 ` [PATCH 12/32] afs: Disable use of the fscache I/O routines David Howells
2021-01-25 21:33 ` [PATCH 13/32] afs: Pass page into dirty region helpers to provide THP size David Howells
2021-01-25 21:33 ` [PATCH 14/32] afs: Print the operation debug_id when logging an unexpected data version David Howells
2021-01-25 21:33 ` [PATCH 15/32] afs: Move key to afs_read struct David Howells
2021-01-25 21:34 ` [PATCH 16/32] afs: Don't truncate iter during data fetch David Howells
2021-01-25 21:34 ` [PATCH 17/32] afs: Log remote unmarshalling errors David Howells
2021-01-25 21:34 ` [PATCH 18/32] afs: Set up the iov_iter before calling afs_extract_data() David Howells
2021-01-25 21:34 ` [PATCH 19/32] afs: Use ITER_XARRAY for writing David Howells
2021-01-25 21:34 ` [PATCH 20/32] afs: Wait on PG_fscache before modifying/releasing a page David Howells
2021-01-25 21:35 ` David Howells [this message]
2021-01-25 21:35 ` [PATCH 22/32] afs: Prepare for use of THPs David Howells
2021-01-25 21:35 ` [PATCH 23/32] afs: Use the fs operation ops to handle FetchData completion David Howells
2021-01-25 21:35 ` [PATCH 24/32] afs: Use new fscache read helper API David Howells
2021-01-25 21:35 ` [PATCH 25/32] NFS: Clean up nfs_readpage() and nfs_readpages() David Howells
2021-01-26 3:59 ` Matthew Wilcox
2021-01-26 15:33 ` David Wysochanski
2021-01-25 21:36 ` [PATCH 26/32] NFS: In nfs_readpage() only increment NFSIOS_READPAGES when read succeeds David Howells
2021-01-25 21:36 ` [PATCH 27/32] NFS: Refactor nfs_readpage() and nfs_readpage_async() to use nfs_readdesc David Howells
2021-01-26 4:05 ` Matthew Wilcox
2021-01-26 15:24 ` David Wysochanski
2021-01-25 21:36 ` [PATCH 28/32] NFS: Call readpage_async_filler() from nfs_readpage_async() David Howells
2021-01-25 21:36 ` [PATCH 29/32] NFS: Add nfs_pageio_complete_read() and remove nfs_readpage_async() David Howells
2021-01-25 21:37 ` [PATCH 30/32] NFS: Allow internal use of read structs and functions David Howells
2021-01-25 21:37 ` [PATCH 31/32] NFS: Convert to the netfs API and nfs_readpage to use netfs_readpage David Howells
2021-01-25 21:37 ` [PATCH 32/32] NFS: Convert readpage to readahead and use netfs_readahead for fscache David Howells
2021-01-26 1:36 ` Matthew Wilcox
2021-01-26 15:24 ` Chuck Lever
2021-01-26 19:10 ` David Wysochanski
2021-01-26 18:25 ` David Wysochanski
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