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Message-Id: <20250505221419.2672473-277-sashal@kernel.org>
Date: Mon, 5 May 2025 18:08:13 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
stable@...r.kernel.org
Cc: Shin'ichiro Kawasaki <shinichiro.kawasaki@....com>,
Bart Van Assche <bvanassche@....org>,
Damien Le Moal <dlemoal@...nel.org>,
Chaitanya Kulkarni <kch@...dia.com>,
Johannes Thumshirn <johannes.thumshirn@....com>,
Jens Axboe <axboe@...nel.dk>,
Sasha Levin <sashal@...nel.org>,
yanjun.zhu@...ux.dev,
zhengqixing@...wei.com,
yukuai3@...wei.com,
willy@...radead.org,
linux-block@...r.kernel.org
Subject: [PATCH AUTOSEL 6.14 277/642] null_blk: generate null_blk configfs features string
From: Shin'ichiro Kawasaki <shinichiro.kawasaki@....com>
[ Upstream commit 2cadb8ef25a6157b5bd3e8fe0d3e23f32defec25 ]
The null_blk configfs file 'features' provides a string that lists
available null_blk features for userspace programs to reference.
The string is defined as a long constant in the code, which tends to be
forgotten for updates. It also causes checkpatch.pl to report
"WARNING: quoted string split across lines".
To avoid these drawbacks, generate the feature string on the fly. Refer
to the ca_name field of each element in the nullb_device_attrs table and
concatenate them in the given buffer. Also, sorted nullb_device_attrs
table elements in alphabetical order.
Of note is that the feature "index" was missing before this commit.
This commit adds it to the generated string.
Suggested-by: Bart Van Assche <bvanassche@....org>
Reviewed-by: Bart Van Assche <bvanassche@....org>
Reviewed-by: Damien Le Moal <dlemoal@...nel.org>
Reviewed-by: Chaitanya Kulkarni <kch@...dia.com>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@....com>
Signed-off-by: Shin'ichiro Kawasaki <shinichiro.kawasaki@....com>
Link: https://lore.kernel.org/r/20250226100613.1622564-2-shinichiro.kawasaki@wdc.com
Signed-off-by: Jens Axboe <axboe@...nel.dk>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
drivers/block/null_blk/main.c | 86 ++++++++++++++++++++---------------
1 file changed, 49 insertions(+), 37 deletions(-)
diff --git a/drivers/block/null_blk/main.c b/drivers/block/null_blk/main.c
index 175566a71bb3f..41c2cd5818b4a 100644
--- a/drivers/block/null_blk/main.c
+++ b/drivers/block/null_blk/main.c
@@ -592,41 +592,41 @@ static ssize_t nullb_device_zone_offline_store(struct config_item *item,
CONFIGFS_ATTR_WO(nullb_device_, zone_offline);
static struct configfs_attribute *nullb_device_attrs[] = {
- &nullb_device_attr_size,
+ &nullb_device_attr_badblocks,
+ &nullb_device_attr_blocking,
+ &nullb_device_attr_blocksize,
+ &nullb_device_attr_cache_size,
&nullb_device_attr_completion_nsec,
- &nullb_device_attr_submit_queues,
- &nullb_device_attr_poll_queues,
+ &nullb_device_attr_discard,
+ &nullb_device_attr_fua,
&nullb_device_attr_home_node,
- &nullb_device_attr_queue_mode,
- &nullb_device_attr_blocksize,
- &nullb_device_attr_max_sectors,
- &nullb_device_attr_irqmode,
&nullb_device_attr_hw_queue_depth,
&nullb_device_attr_index,
- &nullb_device_attr_blocking,
- &nullb_device_attr_use_per_node_hctx,
- &nullb_device_attr_power,
- &nullb_device_attr_memory_backed,
- &nullb_device_attr_discard,
+ &nullb_device_attr_irqmode,
+ &nullb_device_attr_max_sectors,
&nullb_device_attr_mbps,
- &nullb_device_attr_cache_size,
- &nullb_device_attr_badblocks,
- &nullb_device_attr_zoned,
- &nullb_device_attr_zone_size,
+ &nullb_device_attr_memory_backed,
+ &nullb_device_attr_no_sched,
+ &nullb_device_attr_poll_queues,
+ &nullb_device_attr_power,
+ &nullb_device_attr_queue_mode,
+ &nullb_device_attr_rotational,
+ &nullb_device_attr_shared_tag_bitmap,
+ &nullb_device_attr_shared_tags,
+ &nullb_device_attr_size,
+ &nullb_device_attr_submit_queues,
+ &nullb_device_attr_use_per_node_hctx,
+ &nullb_device_attr_virt_boundary,
+ &nullb_device_attr_zone_append_max_sectors,
&nullb_device_attr_zone_capacity,
- &nullb_device_attr_zone_nr_conv,
- &nullb_device_attr_zone_max_open,
+ &nullb_device_attr_zone_full,
&nullb_device_attr_zone_max_active,
- &nullb_device_attr_zone_append_max_sectors,
- &nullb_device_attr_zone_readonly,
+ &nullb_device_attr_zone_max_open,
+ &nullb_device_attr_zone_nr_conv,
&nullb_device_attr_zone_offline,
- &nullb_device_attr_zone_full,
- &nullb_device_attr_virt_boundary,
- &nullb_device_attr_no_sched,
- &nullb_device_attr_shared_tags,
- &nullb_device_attr_shared_tag_bitmap,
- &nullb_device_attr_fua,
- &nullb_device_attr_rotational,
+ &nullb_device_attr_zone_readonly,
+ &nullb_device_attr_zone_size,
+ &nullb_device_attr_zoned,
NULL,
};
@@ -704,16 +704,28 @@ nullb_group_drop_item(struct config_group *group, struct config_item *item)
static ssize_t memb_group_features_show(struct config_item *item, char *page)
{
- return snprintf(page, PAGE_SIZE,
- "badblocks,blocking,blocksize,cache_size,fua,"
- "completion_nsec,discard,home_node,hw_queue_depth,"
- "irqmode,max_sectors,mbps,memory_backed,no_sched,"
- "poll_queues,power,queue_mode,shared_tag_bitmap,"
- "shared_tags,size,submit_queues,use_per_node_hctx,"
- "virt_boundary,zoned,zone_capacity,zone_max_active,"
- "zone_max_open,zone_nr_conv,zone_offline,zone_readonly,"
- "zone_size,zone_append_max_sectors,zone_full,"
- "rotational\n");
+
+ struct configfs_attribute **entry;
+ char delimiter = ',';
+ size_t left = PAGE_SIZE;
+ size_t written = 0;
+ int ret;
+
+ for (entry = &nullb_device_attrs[0]; *entry && left > 0; entry++) {
+ if (!*(entry + 1))
+ delimiter = '\n';
+ ret = snprintf(page + written, left, "%s%c", (*entry)->ca_name,
+ delimiter);
+ if (ret >= left) {
+ WARN_ONCE(1, "Too many null_blk features to print\n");
+ memzero_explicit(page, PAGE_SIZE);
+ return -ENOBUFS;
+ }
+ left -= ret;
+ written += ret;
+ }
+
+ return written;
}
CONFIGFS_ATTR_RO(memb_group_, features);
--
2.39.5
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