From: Jeffle Xu <jefflexu@linux.alibaba.com>
To: dhowells@redhat.com, linux-cachefs@redhat.com, xiang@kernel.org,
chao@kernel.org, linux-erofs@lists.ozlabs.org
Cc: torvalds@linux-foundation.org, gregkh@linuxfoundation.org,
willy@infradead.org, linux-fsdevel@vger.kernel.org,
joseph.qi@linux.alibaba.com, bo.liu@linux.alibaba.com,
tao.peng@linux.alibaba.com, gerry@linux.alibaba.com,
eguan@linux.alibaba.com, linux-kernel@vger.kernel.org,
luodaowen.backend@bytedance.com, tianzichen@kuaishou.com,
fannaihao@baidu.com
Subject: [PATCH v8 13/20] erofs: add erofs_fscache_read_folios() helper
Date: Wed, 6 Apr 2022 15:56:05 +0800 [thread overview]
Message-ID: <20220406075612.60298-14-jefflexu@linux.alibaba.com> (raw)
In-Reply-To: <20220406075612.60298-1-jefflexu@linux.alibaba.com>
Add erofs_fscache_read_folios() helper reading from fscache. It supports
on-demand read semantics. That is, it will make the backend prepare for
the data when cache miss. Once data ready, it will reinitiate a read
from the cache.
This helper can then be used to implement .readpage()/.readahead() of
on-demand read semantics.
Signed-off-by: Jeffle Xu <jefflexu@linux.alibaba.com>
---
fs/erofs/fscache.c | 29 +++++++++++++++++++++++++++++
1 file changed, 29 insertions(+)
diff --git a/fs/erofs/fscache.c b/fs/erofs/fscache.c
index 1c88614203d2..d38a6efc8e50 100644
--- a/fs/erofs/fscache.c
+++ b/fs/erofs/fscache.c
@@ -5,6 +5,35 @@
#include <linux/fscache.h>
#include "internal.h"
+/*
+ * Read data from fscache and fill the read data into page cache described by
+ * @start/len, which shall be both aligned with PAGE_SIZE. @pstart describes
+ * the start physical address in the cache file.
+ */
+static int erofs_fscache_read_folios(struct fscache_cookie *cookie,
+ struct address_space *mapping,
+ loff_t start, size_t len,
+ loff_t pstart)
+{
+ struct netfs_cache_resources cres;
+ struct iov_iter iter;
+ int ret;
+
+ memset(&cres, 0, sizeof(cres));
+
+ ret = fscache_begin_read_operation(&cres, cookie);
+ if (ret)
+ return ret;
+
+ iov_iter_xarray(&iter, READ, &mapping->i_pages, start, len);
+
+ ret = fscache_read(&cres, pstart, &iter,
+ NETFS_READ_HOLE_ONDEMAND, NULL, NULL);
+
+ fscache_end_operation(&cres);
+ return ret;
+}
+
static const struct address_space_operations erofs_fscache_meta_aops = {
};
--
2.27.0
next prev parent reply other threads:[~2022-04-06 12:10 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-06 7:55 [PATCH v8 00/20] fscache,erofs: fscache-based on-demand read semantics Jeffle Xu
2022-04-06 7:55 ` [PATCH v8 01/20] cachefiles: unmark inode in use in error path Jeffle Xu
2022-04-06 7:55 ` [PATCH v8 02/20] cachefiles: extract write routine Jeffle Xu
2022-04-06 7:55 ` [PATCH v8 03/20] cachefiles: notify user daemon with anon_fd when looking up cookie Jeffle Xu
2022-04-06 7:55 ` [PATCH v8 04/20] cachefiles: notify user daemon when withdrawing cookie Jeffle Xu
2022-04-06 7:55 ` [PATCH v8 05/20] cachefiles: implement on-demand read Jeffle Xu
2022-04-06 7:55 ` [PATCH v8 06/20] cachefiles: enable on-demand read mode Jeffle Xu
2022-04-06 7:55 ` [PATCH v8 07/20] cachefiles: document " Jeffle Xu
2022-04-06 7:56 ` [PATCH v8 08/20] erofs: make erofs_map_blocks() generally available Jeffle Xu
2022-04-07 2:44 ` Gao Xiang
2022-04-06 7:56 ` [PATCH v8 09/20] erofs: add mode checking helper Jeffle Xu
2022-04-07 2:46 ` Gao Xiang
2022-04-06 7:56 ` [PATCH v8 10/20] erofs: register fscache volume Jeffle Xu
2022-04-07 2:50 ` Gao Xiang
2022-04-06 7:56 ` [PATCH v8 11/20] erofs: add fscache context helper functions Jeffle Xu
2022-04-07 3:25 ` Gao Xiang
2022-04-06 7:56 ` [PATCH v8 12/20] erofs: add anonymous inode managing page cache for data blob Jeffle Xu
2022-04-07 5:31 ` Gao Xiang
2022-04-08 2:14 ` JeffleXu
2022-04-06 7:56 ` Jeffle Xu [this message]
2022-04-07 14:05 ` [PATCH v8 13/20] erofs: add erofs_fscache_read_folios() helper Gao Xiang
2022-04-06 7:56 ` [PATCH v8 14/20] erofs: register fscache context for primary data blob Jeffle Xu
2022-04-07 14:09 ` Gao Xiang
2022-04-06 7:56 ` [PATCH v8 15/20] erofs: register fscache context for extra data blobs Jeffle Xu
2022-04-07 14:15 ` Gao Xiang
2022-04-08 2:11 ` JeffleXu
2022-04-06 7:56 ` [PATCH v8 16/20] erofs: implement fscache-based metadata read Jeffle Xu
2022-04-07 14:19 ` Gao Xiang
2022-04-06 7:56 ` [PATCH v8 17/20] erofs: implement fscache-based data read for non-inline layout Jeffle Xu
2022-04-07 14:24 ` Gao Xiang
2022-04-06 7:56 ` [PATCH v8 18/20] erofs: implement fscache-based data read for inline layout Jeffle Xu
2022-04-07 14:31 ` Gao Xiang
2022-04-06 7:56 ` [PATCH v8 19/20] erofs: implement fscache-based data readahead Jeffle Xu
2022-04-07 14:36 ` Gao Xiang
2022-04-06 7:56 ` [PATCH v8 20/20] erofs: add 'fsid' mount option Jeffle Xu
2022-04-07 14:39 ` Gao Xiang
2022-04-10 12:51 ` [PATCH v8 00/20] fscache,erofs: fscache-based on-demand read semantics Gao Xiang
2022-04-13 12:27 ` 田子晨
2022-04-14 8:10 ` Jiachen Zhang
2022-04-14 9:29 ` Gao Xiang
2022-04-11 12:13 ` [PATCH v8 02/20] cachefiles: extract write routine David Howells
2022-04-11 12:29 ` JeffleXu
2022-04-11 12:28 ` [PATCH v8 03/20] cachefiles: notify user daemon with anon_fd when looking up cookie David Howells
2022-04-11 12:36 ` JeffleXu
2022-04-11 12:32 ` David Howells
2022-04-11 12:36 ` JeffleXu
2022-04-11 12:35 ` [PATCH v8 04/20] cachefiles: notify user daemon when withdrawing cookie David Howells
2022-04-11 12:48 ` JeffleXu
2022-04-11 13:42 ` David Howells
2022-04-12 3:35 ` JeffleXu
2022-04-11 12:44 ` [PATCH v8 05/20] cachefiles: implement on-demand read David Howells
2022-04-11 12:50 ` JeffleXu
2022-04-11 13:38 ` [PATCH v8 07/20] cachefiles: document on-demand read mode David Howells
2022-04-12 3:17 ` JeffleXu
2022-04-11 13:43 ` [PATCH v8 00/20] fscache,erofs: fscache-based on-demand read semantics David Howells
2022-04-12 3:18 ` JeffleXu
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