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From: Qu Wenruo <wqu@suse.com>
To: linux-btrfs@vger.kernel.org
Subject: [PATCH v2 01/15] btrfs: add sysfs interface for supported sectorsize
Date: Wed, 10 Mar 2021 17:08:19 +0800	[thread overview]
Message-ID: <20210310090833.105015-2-wqu@suse.com> (raw)
In-Reply-To: <20210310090833.105015-1-wqu@suse.com>

Add extra sysfs interface features/supported_ro_sectorsize and
features/supported_rw_sectorsize to indicate subpage support.

Currently for supported_rw_sectorsize all architectures only have their
PAGE_SIZE listed.

While for supported_ro_sectorsize, for systems with 64K page size, 4K
sectorsize is also supported.

This new sysfs interface would help mkfs.btrfs to do more accurate
warning.

Signed-off-by: Qu Wenruo <wqu@suse.com>
---
 fs/btrfs/sysfs.c | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)

diff --git a/fs/btrfs/sysfs.c b/fs/btrfs/sysfs.c
index 6eb1c50fa98c..3ef419899472 100644
--- a/fs/btrfs/sysfs.c
+++ b/fs/btrfs/sysfs.c
@@ -360,11 +360,45 @@ static ssize_t supported_rescue_options_show(struct kobject *kobj,
 BTRFS_ATTR(static_feature, supported_rescue_options,
 	   supported_rescue_options_show);
 
+static ssize_t supported_ro_sectorsize_show(struct kobject *kobj,
+					    struct kobj_attribute *a,
+					    char *buf)
+{
+	ssize_t ret = 0;
+	int i = 0;
+
+	/* For 64K page size, 4K sector size is supported */
+	if (PAGE_SIZE == SZ_64K) {
+		ret += scnprintf(buf + ret, PAGE_SIZE - ret, "%u", SZ_4K);
+		i++;
+	}
+	/* Other than above subpage, only support PAGE_SIZE as sectorsize yet */
+	ret += scnprintf(buf + ret, PAGE_SIZE - ret, "%s%lu\n",
+			 (i ? " " : ""), PAGE_SIZE);
+	return ret;
+}
+BTRFS_ATTR(static_feature, supported_ro_sectorsize,
+	   supported_ro_sectorsize_show);
+
+static ssize_t supported_rw_sectorsize_show(struct kobject *kobj,
+					    struct kobj_attribute *a,
+					    char *buf)
+{
+	ssize_t ret = 0;
+
+	/* Only PAGE_SIZE as sectorsize is supported */
+	ret += scnprintf(buf + ret, PAGE_SIZE - ret, "%lu\n", PAGE_SIZE);
+	return ret;
+}
+BTRFS_ATTR(static_feature, supported_rw_sectorsize,
+	   supported_rw_sectorsize_show);
 static struct attribute *btrfs_supported_static_feature_attrs[] = {
 	BTRFS_ATTR_PTR(static_feature, rmdir_subvol),
 	BTRFS_ATTR_PTR(static_feature, supported_checksums),
 	BTRFS_ATTR_PTR(static_feature, send_stream_version),
 	BTRFS_ATTR_PTR(static_feature, supported_rescue_options),
+	BTRFS_ATTR_PTR(static_feature, supported_ro_sectorsize),
+	BTRFS_ATTR_PTR(static_feature, supported_rw_sectorsize),
 	NULL
 };
 
-- 
2.30.1


  reply	other threads:[~2021-03-10  9:09 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-10  9:08 [PATCH v2 00/15] btrfs: support read-write for subpage metadata Qu Wenruo
2021-03-10  9:08 ` Qu Wenruo [this message]
2021-03-15 11:59   ` [PATCH v2 01/15] btrfs: add sysfs interface for supported sectorsize Anand Jain
2021-03-15 12:39     ` Qu Wenruo
2021-03-15 18:44       ` David Sterba
2021-03-16  0:05         ` Qu Wenruo
2021-03-16  0:10           ` Anand Jain
2021-03-16 10:25             ` David Sterba
2021-03-16 10:27           ` David Sterba
2021-03-10  9:08 ` [PATCH v2 02/15] btrfs: use min() to replace open-code in btrfs_invalidatepage() Qu Wenruo
2021-03-15 12:03   ` Anand Jain
2021-03-10  9:08 ` [PATCH v2 03/15] btrfs: remove unnecessary variable shadowing " Qu Wenruo
2021-03-15 12:06   ` Anand Jain
2021-03-10  9:08 ` [PATCH v2 04/15] btrfs: introduce helpers for subpage dirty status Qu Wenruo
2021-03-10  9:08 ` [PATCH v2 05/15] btrfs: introduce helpers for subpage writeback status Qu Wenruo
2021-03-10  9:08 ` [PATCH v2 06/15] btrfs: allow btree_set_page_dirty() to do more sanity check on subpage metadata Qu Wenruo
2021-03-10  9:08 ` [PATCH v2 07/15] btrfs: support subpage metadata csum calculation at write time Qu Wenruo
2021-03-10  9:08 ` [PATCH v2 08/15] btrfs: make alloc_extent_buffer() check subpage dirty bitmap Qu Wenruo
2021-03-10  9:08 ` [PATCH v2 09/15] btrfs: make the page uptodate assert to be subpage compatible Qu Wenruo
2021-03-10  9:08 ` [PATCH v2 10/15] btrfs: make set/clear_extent_buffer_dirty() " Qu Wenruo
2021-03-10  9:08 ` [PATCH v2 11/15] btrfs: make set_btree_ioerr() accept extent buffer and " Qu Wenruo
2021-03-10  9:08 ` [PATCH v2 12/15] btrfs: introduce end_bio_subpage_eb_writepage() function Qu Wenruo
2021-03-10  9:08 ` [PATCH v2 13/15] btrfs: introduce write_one_subpage_eb() function Qu Wenruo
2021-03-10  9:08 ` [PATCH v2 14/15] btrfs: make lock_extent_buffer_for_io() to be subpage compatible Qu Wenruo
2021-03-10  9:08 ` [PATCH v2 15/15] btrfs: introduce submit_eb_subpage() to submit a subpage metadata page Qu Wenruo

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