All of lore.kernel.org
 help / color / mirror / Atom feed
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 v6 16/22] erofs: implement fscache-based metadata read
Date: Fri, 25 Mar 2022 20:22:17 +0800	[thread overview]
Message-ID: <20220325122223.102958-17-jefflexu@linux.alibaba.com> (raw)
In-Reply-To: <20220325122223.102958-1-jefflexu@linux.alibaba.com>

Implements the data plane of reading metadata from bootstrap blob file
over fscache.

Signed-off-by: Jeffle Xu <jefflexu@linux.alibaba.com>
---
 fs/erofs/data.c     | 17 +++++++++++++++--
 fs/erofs/fscache.c  | 34 ++++++++++++++++++++++++++++++++++
 fs/erofs/internal.h |  8 ++++++++
 3 files changed, 57 insertions(+), 2 deletions(-)

diff --git a/fs/erofs/data.c b/fs/erofs/data.c
index 6e2a28242453..b4571bea93d5 100644
--- a/fs/erofs/data.c
+++ b/fs/erofs/data.c
@@ -31,15 +31,28 @@ void erofs_put_metabuf(struct erofs_buf *buf)
 void *erofs_read_metabuf(struct erofs_buf *buf, struct super_block *sb,
 			erofs_blk_t blkaddr, enum erofs_kmap_type type)
 {
-	struct address_space *const mapping = sb->s_bdev->bd_inode->i_mapping;
+	struct address_space *mapping;
+	struct erofs_sb_info *sbi = EROFS_SB(sb);
 	erofs_off_t offset = blknr_to_addr(blkaddr);
 	pgoff_t index = offset >> PAGE_SHIFT;
 	struct page *page = buf->page;
 
 	if (!page || page->index != index) {
 		erofs_put_metabuf(buf);
-		page = read_cache_page_gfp(mapping, index,
+		if (IS_ENABLED(CONFIG_EROFS_FS_ONDEMAND) &&
+		    erofs_is_nodev_mode(sb)) {
+			struct folio *folio;
+
+			folio = erofs_fscache_get_folio(sbi->bootstrap, index);
+			if (IS_ERR(folio))
+				page = (struct page *)folio;
+			else
+				page = folio_page(folio, 0);
+		} else {
+			mapping = sb->s_bdev->bd_inode->i_mapping;
+			page = read_cache_page_gfp(mapping, index,
 				mapping_gfp_constraint(mapping, ~__GFP_FS));
+		}
 		if (IS_ERR(page))
 			return page;
 		/* should already be PageUptodate, no need to lock page */
diff --git a/fs/erofs/fscache.c b/fs/erofs/fscache.c
index 6a55f7b5f883..91377939b4f7 100644
--- a/fs/erofs/fscache.c
+++ b/fs/erofs/fscache.c
@@ -46,9 +46,43 @@ static inline int erofs_fscache_read_folio(struct fscache_cookie *cookie,
 					 pstart);
 }
 
+static int erofs_fscache_readpage_blob(struct file *data, struct page *page)
+{
+	int ret;
+	struct erofs_fscache *ctx = (struct erofs_fscache *)data;
+	struct folio *folio = page_folio(page);
+
+	ret = erofs_fscache_read_folio(ctx->cookie, folio, folio_pos(folio));
+	if (!ret)
+		folio_mark_uptodate(folio);
+
+	folio_unlock(folio);
+	return ret;
+}
+
 static const struct address_space_operations erofs_fscache_blob_aops = {
+	.readpage = erofs_fscache_readpage_blob,
 };
 
+/*
+ * erofs_fscache_get_folio - find and read page cache of blob file
+ * @ctx:	the context of the blob file
+ * @index:	the page index
+ *
+ * Get the page cache of the blob file at the index offset. It will find the
+ * page through the address space of the anonymous inode. This function is only
+ * used to read page cache of bootstrap blob file (metadata), since currently
+ * only bootstrap blob file manages an anonymous inode inside the fscache
+ * context.
+ *
+ * Return: up to date page on success, ERR_PTR() on failure.
+ */
+struct folio *erofs_fscache_get_folio(struct erofs_fscache *ctx, pgoff_t index)
+{
+	DBG_BUGON(!ctx->inode);
+	return read_mapping_folio(ctx->inode->i_mapping, index, ctx);
+}
+
 static int erofs_fscache_init_cookie(struct erofs_fscache *ctx, char *path)
 {
 	struct fscache_cookie *cookie;
diff --git a/fs/erofs/internal.h b/fs/erofs/internal.h
index d8c886a7491e..fa89a1e3012f 100644
--- a/fs/erofs/internal.h
+++ b/fs/erofs/internal.h
@@ -632,6 +632,8 @@ void erofs_exit_fscache(void);
 struct erofs_fscache *erofs_fscache_get(struct super_block *sb, char *path,
 					bool need_inode);
 void erofs_fscache_put(struct erofs_fscache *ctx);
+
+struct folio *erofs_fscache_get_folio(struct erofs_fscache *ctx, pgoff_t index);
 #else
 static inline int erofs_init_fscache(void) { return 0; }
 static inline void erofs_exit_fscache(void) {}
@@ -643,6 +645,12 @@ static inline struct erofs_fscache *erofs_fscache_get(struct super_block *sb,
 	return ERR_PTR(-EOPNOTSUPP);
 }
 static inline void erofs_fscache_put(struct erofs_fscache *ctx) {}
+
+static inline struct folio *erofs_fscache_get_folio(struct erofs_fscache *ctx,
+						    pgoff_t index)
+{
+	return ERR_PTR(-EOPNOTSUPP);
+}
 #endif
 
 #define EFSCORRUPTED    EUCLEAN         /* Filesystem is corrupted */
-- 
2.27.0


WARNING: multiple messages have this Message-ID (diff)
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: gregkh@linuxfoundation.org, fannaihao@baidu.com,
	willy@infradead.org, linux-kernel@vger.kernel.org,
	tianzichen@kuaishou.com, joseph.qi@linux.alibaba.com,
	linux-fsdevel@vger.kernel.org, luodaowen.backend@bytedance.com,
	gerry@linux.alibaba.com, torvalds@linux-foundation.org
Subject: [PATCH v6 16/22] erofs: implement fscache-based metadata read
Date: Fri, 25 Mar 2022 20:22:17 +0800	[thread overview]
Message-ID: <20220325122223.102958-17-jefflexu@linux.alibaba.com> (raw)
In-Reply-To: <20220325122223.102958-1-jefflexu@linux.alibaba.com>

Implements the data plane of reading metadata from bootstrap blob file
over fscache.

Signed-off-by: Jeffle Xu <jefflexu@linux.alibaba.com>
---
 fs/erofs/data.c     | 17 +++++++++++++++--
 fs/erofs/fscache.c  | 34 ++++++++++++++++++++++++++++++++++
 fs/erofs/internal.h |  8 ++++++++
 3 files changed, 57 insertions(+), 2 deletions(-)

diff --git a/fs/erofs/data.c b/fs/erofs/data.c
index 6e2a28242453..b4571bea93d5 100644
--- a/fs/erofs/data.c
+++ b/fs/erofs/data.c
@@ -31,15 +31,28 @@ void erofs_put_metabuf(struct erofs_buf *buf)
 void *erofs_read_metabuf(struct erofs_buf *buf, struct super_block *sb,
 			erofs_blk_t blkaddr, enum erofs_kmap_type type)
 {
-	struct address_space *const mapping = sb->s_bdev->bd_inode->i_mapping;
+	struct address_space *mapping;
+	struct erofs_sb_info *sbi = EROFS_SB(sb);
 	erofs_off_t offset = blknr_to_addr(blkaddr);
 	pgoff_t index = offset >> PAGE_SHIFT;
 	struct page *page = buf->page;
 
 	if (!page || page->index != index) {
 		erofs_put_metabuf(buf);
-		page = read_cache_page_gfp(mapping, index,
+		if (IS_ENABLED(CONFIG_EROFS_FS_ONDEMAND) &&
+		    erofs_is_nodev_mode(sb)) {
+			struct folio *folio;
+
+			folio = erofs_fscache_get_folio(sbi->bootstrap, index);
+			if (IS_ERR(folio))
+				page = (struct page *)folio;
+			else
+				page = folio_page(folio, 0);
+		} else {
+			mapping = sb->s_bdev->bd_inode->i_mapping;
+			page = read_cache_page_gfp(mapping, index,
 				mapping_gfp_constraint(mapping, ~__GFP_FS));
+		}
 		if (IS_ERR(page))
 			return page;
 		/* should already be PageUptodate, no need to lock page */
diff --git a/fs/erofs/fscache.c b/fs/erofs/fscache.c
index 6a55f7b5f883..91377939b4f7 100644
--- a/fs/erofs/fscache.c
+++ b/fs/erofs/fscache.c
@@ -46,9 +46,43 @@ static inline int erofs_fscache_read_folio(struct fscache_cookie *cookie,
 					 pstart);
 }
 
+static int erofs_fscache_readpage_blob(struct file *data, struct page *page)
+{
+	int ret;
+	struct erofs_fscache *ctx = (struct erofs_fscache *)data;
+	struct folio *folio = page_folio(page);
+
+	ret = erofs_fscache_read_folio(ctx->cookie, folio, folio_pos(folio));
+	if (!ret)
+		folio_mark_uptodate(folio);
+
+	folio_unlock(folio);
+	return ret;
+}
+
 static const struct address_space_operations erofs_fscache_blob_aops = {
+	.readpage = erofs_fscache_readpage_blob,
 };
 
+/*
+ * erofs_fscache_get_folio - find and read page cache of blob file
+ * @ctx:	the context of the blob file
+ * @index:	the page index
+ *
+ * Get the page cache of the blob file at the index offset. It will find the
+ * page through the address space of the anonymous inode. This function is only
+ * used to read page cache of bootstrap blob file (metadata), since currently
+ * only bootstrap blob file manages an anonymous inode inside the fscache
+ * context.
+ *
+ * Return: up to date page on success, ERR_PTR() on failure.
+ */
+struct folio *erofs_fscache_get_folio(struct erofs_fscache *ctx, pgoff_t index)
+{
+	DBG_BUGON(!ctx->inode);
+	return read_mapping_folio(ctx->inode->i_mapping, index, ctx);
+}
+
 static int erofs_fscache_init_cookie(struct erofs_fscache *ctx, char *path)
 {
 	struct fscache_cookie *cookie;
diff --git a/fs/erofs/internal.h b/fs/erofs/internal.h
index d8c886a7491e..fa89a1e3012f 100644
--- a/fs/erofs/internal.h
+++ b/fs/erofs/internal.h
@@ -632,6 +632,8 @@ void erofs_exit_fscache(void);
 struct erofs_fscache *erofs_fscache_get(struct super_block *sb, char *path,
 					bool need_inode);
 void erofs_fscache_put(struct erofs_fscache *ctx);
+
+struct folio *erofs_fscache_get_folio(struct erofs_fscache *ctx, pgoff_t index);
 #else
 static inline int erofs_init_fscache(void) { return 0; }
 static inline void erofs_exit_fscache(void) {}
@@ -643,6 +645,12 @@ static inline struct erofs_fscache *erofs_fscache_get(struct super_block *sb,
 	return ERR_PTR(-EOPNOTSUPP);
 }
 static inline void erofs_fscache_put(struct erofs_fscache *ctx) {}
+
+static inline struct folio *erofs_fscache_get_folio(struct erofs_fscache *ctx,
+						    pgoff_t index)
+{
+	return ERR_PTR(-EOPNOTSUPP);
+}
 #endif
 
 #define EFSCORRUPTED    EUCLEAN         /* Filesystem is corrupted */
-- 
2.27.0


  parent reply	other threads:[~2022-03-25 12:23 UTC|newest]

Thread overview: 73+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-03-25 12:22 [PATCH v6 00/22] fscache,erofs: fscache-based on-demand read semantics Jeffle Xu
2022-03-25 12:22 ` [PATCH v6 00/22] fscache, erofs: " Jeffle Xu
2022-03-25 12:22 ` [PATCH v6 01/22] fscache: export fscache_end_operation() Jeffle Xu
2022-03-25 12:22   ` Jeffle Xu
2022-03-25 12:22 ` [PATCH v6 02/22] cachefiles: extract write routine Jeffle Xu
2022-03-25 12:22   ` Jeffle Xu
2022-03-25 12:22 ` [PATCH v6 03/22] cachefiles: notify user daemon with anon_fd when looking up cookie Jeffle Xu
2022-03-25 12:22   ` Jeffle Xu
2022-03-25 20:52   ` kernel test robot
2022-03-25 20:52     ` kernel test robot
2022-03-25 23:25   ` kernel test robot
2022-03-25 23:25     ` kernel test robot
2022-03-29  6:14   ` [Linux-cachefs] " JeffleXu
2022-03-29  6:14     ` JeffleXu
2022-03-25 12:22 ` [PATCH v6 04/22] cachefiles: notify user daemon when withdrawing cookie Jeffle Xu
2022-03-25 12:22   ` Jeffle Xu
2022-03-25 12:22 ` [PATCH v6 05/22] cachefiles: implement on-demand read Jeffle Xu
2022-03-25 12:22   ` Jeffle Xu
2022-03-25 12:22 ` [PATCH v6 06/22] cachefiles: enable on-demand read mode Jeffle Xu
2022-03-25 12:22   ` Jeffle Xu
2022-03-25 12:22 ` [PATCH v6 07/22] cachefiles: document " Jeffle Xu
2022-03-25 12:22   ` Jeffle Xu
2022-03-25 12:22 ` [PATCH v6 08/22] erofs: use meta buffers for erofs_read_superblock() Jeffle Xu
2022-03-25 12:22   ` Jeffle Xu
2022-03-25 12:22 ` [PATCH v6 09/22] erofs: make erofs_map_blocks() generally available Jeffle Xu
2022-03-25 12:22   ` Jeffle Xu
2022-03-25 12:22 ` [PATCH v6 10/22] erofs: add mode checking helper Jeffle Xu
2022-03-25 12:22   ` Jeffle Xu
2022-03-28  2:42   ` Gao Xiang
2022-03-28  2:42     ` Gao Xiang
2022-03-28  2:46     ` JeffleXu
2022-03-25 12:22 ` [PATCH v6 11/22] erofs: register global fscache volume Jeffle Xu
2022-03-25 12:22   ` Jeffle Xu
2022-03-25 12:22 ` [PATCH v6 12/22] erofs: add cookie context helper functions Jeffle Xu
2022-03-25 12:22   ` Jeffle Xu
2022-03-25 13:41   ` Gao Xiang
2022-03-25 13:41     ` Gao Xiang
2022-03-28  3:11     ` JeffleXu
2022-03-25 12:22 ` [PATCH v6 13/22] erofs: add anonymous inode managing page cache of blob file Jeffle Xu
2022-03-25 12:22   ` Jeffle Xu
2022-03-25 13:46   ` [Linux-cachefs] " Gao Xiang
2022-03-25 13:46     ` Gao Xiang
2022-03-25 12:22 ` [PATCH v6 14/22] erofs: add erofs_fscache_read_folios() helper Jeffle Xu
2022-03-25 12:22   ` Jeffle Xu
2022-03-28  2:49   ` [Linux-cachefs] " Gao Xiang
2022-03-28  2:49     ` Gao Xiang
2022-03-25 12:22 ` [PATCH v6 15/22] erofs: register cookie context for bootstrap blob Jeffle Xu
2022-03-25 12:22   ` Jeffle Xu
2022-03-28  3:04   ` Gao Xiang
2022-03-28  3:04     ` Gao Xiang
2022-03-28  3:15     ` JeffleXu
2022-03-25 12:22 ` Jeffle Xu [this message]
2022-03-25 12:22   ` [PATCH v6 16/22] erofs: implement fscache-based metadata read Jeffle Xu
2022-03-25 12:22 ` [PATCH v6 17/22] erofs: implement fscache-based data read for non-inline layout Jeffle Xu
2022-03-25 12:22   ` Jeffle Xu
2022-03-28  3:14   ` Gao Xiang
2022-03-28  3:14     ` Gao Xiang
2022-03-25 12:22 ` [PATCH v6 18/22] erofs: implement fscache-based data read for inline layout Jeffle Xu
2022-03-25 12:22   ` Jeffle Xu
2022-03-25 12:22 ` [PATCH v6 19/22] erofs: register cookie context for data blobs Jeffle Xu
2022-03-25 12:22   ` Jeffle Xu
2022-03-28  9:48   ` Gao Xiang
2022-03-28  9:48     ` Gao Xiang
2022-03-25 12:22 ` [PATCH v6 20/22] erofs: implement fscache-based data read " Jeffle Xu
2022-03-25 12:22   ` Jeffle Xu
2022-03-28  9:50   ` Gao Xiang
2022-03-28  9:50     ` Gao Xiang
2022-03-25 12:22 ` [PATCH v6 21/22] erofs: implement fscache-based data readahead Jeffle Xu
2022-03-25 12:22   ` Jeffle Xu
2022-03-28 10:55   ` Gao Xiang
2022-03-28 10:55     ` Gao Xiang
2022-03-25 12:22 ` [PATCH v6 22/22] erofs: add 'tag' mount option Jeffle Xu
2022-03-25 12:22   ` Jeffle Xu

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=20220325122223.102958-17-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=fannaihao@baidu.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=luodaowen.backend@bytedance.com \
    --cc=tao.peng@linux.alibaba.com \
    --cc=tianzichen@kuaishou.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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.