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
Subject: [PATCH v3 15/22] erofs: implement fscache-based data read for non-inline layout
Date: Wed, 9 Feb 2022 14:01:01 +0800 [thread overview]
Message-ID: <20220209060108.43051-16-jefflexu@linux.alibaba.com> (raw)
In-Reply-To: <20220209060108.43051-1-jefflexu@linux.alibaba.com>
This patch implements the data plane of reading data from bootstrap blob
file over fscache for non-inline layout.
Be noted that compressed layout is not supported yet.
Signed-off-by: Jeffle Xu <jefflexu@linux.alibaba.com>
---
fs/erofs/fscache.c | 94 +++++++++++++++++++++++++++++++++++++++++++++
fs/erofs/inode.c | 6 ++-
fs/erofs/internal.h | 1 +
3 files changed, 100 insertions(+), 1 deletion(-)
diff --git a/fs/erofs/fscache.c b/fs/erofs/fscache.c
index a29d2ecff58b..82fdde054b0b 100644
--- a/fs/erofs/fscache.c
+++ b/fs/erofs/fscache.c
@@ -4,6 +4,12 @@
*/
#include "internal.h"
+struct erofs_fscache_map {
+ struct erofs_fscache_context *m_ctx;
+ erofs_off_t m_pa, m_la, o_la;
+ u64 m_llen;
+};
+
static struct fscache_volume *volume;
static int erofs_fscache_read_page(struct fscache_cookie *cookie,
@@ -58,10 +64,98 @@ static int erofs_fscache_readpage_blob(struct file *data, struct page *page)
return ret;
}
+static inline int erofs_fscache_get_map(struct erofs_fscache_map *fsmap,
+ struct erofs_map_blocks *map,
+ struct super_block *sb)
+{
+ struct erofs_sb_info *sbi = EROFS_SB(sb);
+
+ fsmap->m_ctx = sbi->bootstrap;
+ fsmap->m_la = map->m_la;
+ fsmap->m_pa = map->m_pa;
+ fsmap->m_llen = map->m_llen;
+
+ return 0;
+}
+
+static int erofs_fscache_readpage_noinline(struct page *page,
+ struct erofs_fscache_map *fsmap)
+{
+ struct fscache_cookie *cookie = fsmap->m_ctx->cookie;
+ /*
+ * 1) For FLAT_PLAIN layout, the output map.m_la shall be equal to o_la,
+ * and the output map.m_pa is exactly the physical address of o_la.
+ * 2) For CHUNK_BASED layout, the output map.m_la is rounded down to the
+ * nearest chunk boundary, and the output map.m_pa is actually the
+ * physical address of this chunk boundary. So we need to recalculate
+ * the actual physical address of o_la.
+ */
+ loff_t start = fsmap->m_pa + fsmap->o_la - fsmap->m_la;
+
+ return erofs_fscache_read_page(cookie, page, start);
+}
+
+static int erofs_fscache_do_readpage(struct page *page)
+{
+ struct inode *inode = page->mapping->host;
+ struct erofs_inode *vi = EROFS_I(inode);
+ struct super_block *sb = inode->i_sb;
+ struct erofs_map_blocks map;
+ struct erofs_fscache_map fsmap;
+ int ret;
+
+ if (erofs_inode_is_data_compressed(vi->datalayout)) {
+ erofs_info(sb, "compressed layout not supported yet");
+ return -EOPNOTSUPP;
+ }
+
+ map.m_la = fsmap.o_la = page_offset(page);
+
+ ret = erofs_map_blocks(inode, &map, EROFS_GET_BLOCKS_RAW);
+ if (ret)
+ return ret;
+
+ if (!(map.m_flags & EROFS_MAP_MAPPED)) {
+ zero_user(page, 0, PAGE_SIZE);
+ return 0;
+ }
+
+ ret = erofs_fscache_get_map(&fsmap, &map, sb);
+ if (ret)
+ return ret;
+
+ switch (vi->datalayout) {
+ case EROFS_INODE_FLAT_PLAIN:
+ case EROFS_INODE_CHUNK_BASED:
+ return erofs_fscache_readpage_noinline(page, &fsmap);
+ default:
+ DBG_BUGON(1);
+ return -EOPNOTSUPP;
+ }
+}
+
+static int erofs_fscache_readpage(struct file *file, struct page *page)
+{
+ int ret;
+
+ ret = erofs_fscache_do_readpage(page);
+ if (ret)
+ SetPageError(page);
+ else
+ SetPageUptodate(page);
+
+ unlock_page(page);
+ return ret;
+}
+
static const struct address_space_operations erofs_fscache_blob_aops = {
.readpage = erofs_fscache_readpage_blob,
};
+const struct address_space_operations erofs_fscache_access_aops = {
+ .readpage = erofs_fscache_readpage,
+};
+
struct page *erofs_fscache_read_cache_page(struct erofs_fscache_context *ctx,
pgoff_t index)
{
diff --git a/fs/erofs/inode.c b/fs/erofs/inode.c
index ff62f84f47d3..2f450cb3a7b9 100644
--- a/fs/erofs/inode.c
+++ b/fs/erofs/inode.c
@@ -296,7 +296,11 @@ static int erofs_fill_inode(struct inode *inode, int isdir)
err = z_erofs_fill_inode(inode);
goto out_unlock;
}
- inode->i_mapping->a_ops = &erofs_raw_access_aops;
+
+ if (erofs_bdev_mode(inode->i_sb))
+ inode->i_mapping->a_ops = &erofs_raw_access_aops;
+ else
+ inode->i_mapping->a_ops = &erofs_fscache_access_aops;
out_unlock:
erofs_put_metabuf(&buf);
diff --git a/fs/erofs/internal.h b/fs/erofs/internal.h
index fca706cfaf72..548f928b0ded 100644
--- a/fs/erofs/internal.h
+++ b/fs/erofs/internal.h
@@ -393,6 +393,7 @@ struct page *erofs_grab_cache_page_nowait(struct address_space *mapping,
extern const struct super_operations erofs_sops;
extern const struct address_space_operations erofs_raw_access_aops;
+extern const struct address_space_operations erofs_fscache_access_aops;
extern const struct address_space_operations z_erofs_aops;
/*
--
2.27.0
next prev parent reply other threads:[~2022-02-09 6:12 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-09 6:00 [PATCH v3 00/22] fscache,erofs: fscache-based demand-read semantics Jeffle Xu
2022-02-09 6:00 ` [PATCH v3 01/22] fscache: export fscache_end_operation() Jeffle Xu
2022-02-17 7:44 ` Liu Bo
2022-02-09 6:00 ` [PATCH v3 02/22] fscache: add a method to support on-demand read semantics Jeffle Xu
2022-02-09 6:00 ` [PATCH v3 03/22] cachefiles: extract generic function for daemon methods Jeffle Xu
2022-02-17 8:17 ` Liu Bo
2022-02-09 6:00 ` [PATCH v3 04/22] cachefiles: detect backing file size in on-demand read mode Jeffle Xu
2022-02-09 6:00 ` [PATCH v3 05/22] cachefiles: introduce new devnode for " Jeffle Xu
2022-02-15 9:03 ` JeffleXu
2022-02-15 10:37 ` Greg KH
2022-02-16 8:17 ` JeffleXu
2022-02-15 11:13 ` [PATCH v4 05/23] " Jeffle Xu
2022-02-16 10:48 ` Greg KH
2022-02-16 12:49 ` JeffleXu
2022-02-16 17:48 ` Greg KH
2022-02-17 1:49 ` JeffleXu
2022-02-09 6:00 ` [PATCH v3 06/22] erofs: use meta buffers for erofs_read_superblock() Jeffle Xu
2022-02-09 7:52 ` Gao Xiang
2022-02-09 6:00 ` [PATCH v3 07/22] erofs: export erofs_map_blocks() Jeffle Xu
2022-02-09 6:00 ` [PATCH v3 08/22] erofs: add mode checking helper Jeffle Xu
2022-02-09 6:00 ` [PATCH v3 09/22] erofs: register global fscache volume Jeffle Xu
2022-02-09 6:00 ` [PATCH v3 10/22] erofs: add cookie context helper functions Jeffle Xu
2022-02-09 6:00 ` [PATCH v3 11/22] erofs: add anonymous inode managing page cache of blob file Jeffle Xu
2022-02-09 6:00 ` [PATCH v3 12/22] erofs: add erofs_fscache_read_page() helper Jeffle Xu
2022-02-09 6:00 ` [PATCH v3 13/22] erofs: register cookie context for bootstrap blob Jeffle Xu
2022-02-09 6:01 ` [PATCH v3 14/22] erofs: implement fscache-based metadata read Jeffle Xu
2022-02-09 6:01 ` Jeffle Xu [this message]
2022-02-09 6:01 ` [PATCH v3 16/22] erofs: implement fscache-based data read for inline layout Jeffle Xu
2022-02-09 6:01 ` [PATCH v3 17/22] erofs: register cookie context for data blobs Jeffle Xu
2022-02-09 6:01 ` [PATCH v3 18/22] erofs: implement fscache-based data read " Jeffle Xu
2022-02-09 6:01 ` [PATCH v3 19/22] erofs: implement fscache-based data readahead for hole Jeffle Xu
2022-02-09 6:01 ` [PATCH v3 20/22] erofs: implement fscache-based data readahead for non-inline layout Jeffle Xu
2022-02-09 6:01 ` [PATCH v3 21/22] erofs: implement fscache-based data readahead for inline layout Jeffle Xu
2022-02-09 6:01 ` [PATCH v3 22/22] erofs: add 'uuid' mount option Jeffle Xu
2022-02-10 5:58 ` [Linux-cachefs] [PATCH v3 00/22] fscache, erofs: fscache-based demand-read semantics Gao Xiang
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20220209060108.43051-16-jefflexu@linux.alibaba.com \
--to=jefflexu@linux.alibaba.com \
--cc=bo.liu@linux.alibaba.com \
--cc=chao@kernel.org \
--cc=dhowells@redhat.com \
--cc=eguan@linux.alibaba.com \
--cc=gerry@linux.alibaba.com \
--cc=gregkh@linuxfoundation.org \
--cc=joseph.qi@linux.alibaba.com \
--cc=linux-cachefs@redhat.com \
--cc=linux-erofs@lists.ozlabs.org \
--cc=linux-fsdevel@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=tao.peng@linux.alibaba.com \
--cc=torvalds@linux-foundation.org \
--cc=willy@infradead.org \
--cc=xiang@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).