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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 08/22] erofs: add mode checking helper
Date: Wed,  9 Feb 2022 14:00:54 +0800	[thread overview]
Message-ID: <20220209060108.43051-9-jefflexu@linux.alibaba.com> (raw)
In-Reply-To: <20220209060108.43051-1-jefflexu@linux.alibaba.com>

Until then erofs is exactly blockdev based filesystem. In other using
scenarios (e.g. container image), erofs needs to run upon files.

This patch set is going to introduces a new nodev mode, in which erofs
could be mounted from a bootstrap blob file containing complete erofs
image.

Add a helper checking which mode erofs works in.

Signed-off-by: Jeffle Xu <jefflexu@linux.alibaba.com>
---
 fs/erofs/internal.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/fs/erofs/internal.h b/fs/erofs/internal.h
index f9f94d63d40f..2b9337d385ce 100644
--- a/fs/erofs/internal.h
+++ b/fs/erofs/internal.h
@@ -161,6 +161,11 @@ struct erofs_sb_info {
 #define set_opt(opt, option)	((opt)->mount_opt |= EROFS_MOUNT_##option)
 #define test_opt(opt, option)	((opt)->mount_opt & EROFS_MOUNT_##option)
 
+static inline bool erofs_bdev_mode(struct super_block *sb)
+{
+	return sb->s_bdev;
+}
+
 enum {
 	EROFS_ZIP_CACHE_DISABLED,
 	EROFS_ZIP_CACHE_READAHEAD,
-- 
2.27.0


  parent reply	other threads:[~2022-02-09  6:05 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 ` Jeffle Xu [this message]
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 ` [PATCH v3 15/22] erofs: implement fscache-based data read for non-inline layout Jeffle Xu
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

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