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Subject[Patch 2/2] block: add sysfs lockdep class for iosched

Similar to the previous PM case, in iosched, we hold an s_active
lock to store "scheduler", meanwhile we want to remove "iosched/*"
files.
This patch depends on the previous one. I tested it on my machine,
it fixes the problem.

Reported-by: Hugh Dickins <hugh.dickins@tiscali.co.uk>
Signed-off-by: WANG Cong <amwang@redhat.com>
Cc: Jens Axboe <jens.axboe@oracle.com>

---
block/blk-sysfs.c | 120 +++++++++++++++----------------------------------
include/linux/sysfs.h | 1 +
2 files changed, 38 insertions(+), 83 deletions(-)
diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c
index 8606c95..f863d4d 100644
--- a/block/blk-sysfs.c
+++ b/block/blk-sysfs.c
@@ -6,6 +6,7 @@
#include <linux/bio.h>
#include <linux/blkdev.h>
#include <linux/blktrace_api.h>
+#include <linux/sysfs.h>

#include "blk.h"

@@ -254,105 +255,58 @@ static ssize_t queue_iostats_store(struct request_queue *q, const char *page,
return ret;
}

-static struct queue_sysfs_entry queue_requests_entry = {
- .attr = {.name = "nr_requests", .mode = S_IRUGO | S_IWUSR },
- .show = queue_requests_show,
- .store = queue_requests_store,
-};
-
-static struct queue_sysfs_entry queue_ra_entry = {
- .attr = {.name = "read_ahead_kb", .mode = S_IRUGO | S_IWUSR },
- .show = queue_ra_show,
- .store = queue_ra_store,
-};
+#define queue_sysfs_rw_attr(_name, _filename) \
+static struct queue_sysfs_entry _name##_entry = { \
+ .attr = { \
+ .name = _filename, \
+ .mode = S_IRUGO | S_IWUSR, \
+ .class = SYSFS_ATTR_IOSCHED, \
+ }, \
+ .show = _name##_show, \
+ .store = _name##_store, \
+}

-static struct queue_sysfs_entry queue_max_sectors_entry = {
- .attr = {.name = "max_sectors_kb", .mode = S_IRUGO | S_IWUSR },
- .show = queue_max_sectors_show,
- .store = queue_max_sectors_store,
-};
+#define queue_sysfs_ro_attr(_name, _filename) \
+static struct queue_sysfs_entry _name##_entry = { \
+ .attr = { \
+ .name = _filename, \
+ .mode = S_IRUGO, \
+ .class = SYSFS_ATTR_IOSCHED, \
+ }, \
+ .show = _name##_show, \
+}

-static struct queue_sysfs_entry queue_max_hw_sectors_entry = {
- .attr = {.name = "max_hw_sectors_kb", .mode = S_IRUGO },
- .show = queue_max_hw_sectors_show,
-};

-static struct queue_sysfs_entry queue_iosched_entry = {
- .attr = {.name = "scheduler", .mode = S_IRUGO | S_IWUSR },
- .show = elv_iosched_show,
- .store = elv_iosched_store,
-};
+queue_sysfs_rw_attr(queue_requests, "nr_requests");
+queue_sysfs_rw_attr(queue_ra, "read_ahead_kb");
+queue_sysfs_rw_attr(queue_max_sectors, "max_sectors_kb");
+queue_sysfs_ro_attr(queue_max_hw_sectors, "max_hw_sectors_kb");
+queue_sysfs_rw_attr(elv_iosched, "scheduler");
+queue_sysfs_ro_attr(queue_logical_block_size, "logical_block_size");

static struct queue_sysfs_entry queue_hw_sector_size_entry = {
.attr = {.name = "hw_sector_size", .mode = S_IRUGO },
.show = queue_logical_block_size_show,
};

-static struct queue_sysfs_entry queue_logical_block_size_entry = {
- .attr = {.name = "logical_block_size", .mode = S_IRUGO },
- .show = queue_logical_block_size_show,
-};
-
-static struct queue_sysfs_entry queue_physical_block_size_entry = {
- .attr = {.name = "physical_block_size", .mode = S_IRUGO },
- .show = queue_physical_block_size_show,
-};
+queue_sysfs_ro_attr(queue_physical_block_size, "physical_block_size");
+queue_sysfs_ro_attr(queue_io_min, "minimum_io_size");
+queue_sysfs_ro_attr(queue_io_opt, "optimal_io_size");
+queue_sysfs_ro_attr(queue_discard_granularity, "discard_granularity");
+queue_sysfs_ro_attr(queue_discard_max, "discard_max_bytes");
+queue_sysfs_ro_attr(queue_discard_zeroes_data, "discard_zeroes_data");

-static struct queue_sysfs_entry queue_io_min_entry = {
- .attr = {.name = "minimum_io_size", .mode = S_IRUGO },
- .show = queue_io_min_show,
-};
-
-static struct queue_sysfs_entry queue_io_opt_entry = {
- .attr = {.name = "optimal_io_size", .mode = S_IRUGO },
- .show = queue_io_opt_show,
-};
-
-static struct queue_sysfs_entry queue_discard_granularity_entry = {
- .attr = {.name = "discard_granularity", .mode = S_IRUGO },
- .show = queue_discard_granularity_show,
-};
-
-static struct queue_sysfs_entry queue_discard_max_entry = {
- .attr = {.name = "discard_max_bytes", .mode = S_IRUGO },
- .show = queue_discard_max_show,
-};
-
-static struct queue_sysfs_entry queue_discard_zeroes_data_entry = {
- .attr = {.name = "discard_zeroes_data", .mode = S_IRUGO },
- .show = queue_discard_zeroes_data_show,
-};
-
-static struct queue_sysfs_entry queue_nonrot_entry = {
- .attr = {.name = "rotational", .mode = S_IRUGO | S_IWUSR },
- .show = queue_nonrot_show,
- .store = queue_nonrot_store,
-};
-
-static struct queue_sysfs_entry queue_nomerges_entry = {
- .attr = {.name = "nomerges", .mode = S_IRUGO | S_IWUSR },
- .show = queue_nomerges_show,
- .store = queue_nomerges_store,
-};
-
-static struct queue_sysfs_entry queue_rq_affinity_entry = {
- .attr = {.name = "rq_affinity", .mode = S_IRUGO | S_IWUSR },
- .show = queue_rq_affinity_show,
- .store = queue_rq_affinity_store,
-};
-
-static struct queue_sysfs_entry queue_iostats_entry = {
- .attr = {.name = "iostats", .mode = S_IRUGO | S_IWUSR },
- .show = queue_iostats_show,
- .store = queue_iostats_store,
-};
+queue_sysfs_rw_attr(queue_nonrot, "rotational");
+queue_sysfs_rw_attr(queue_nomerges, "nomerges");
+queue_sysfs_rw_attr(queue_rq_affinity, "rq_affinity");
+queue_sysfs_rw_attr(queue_iostats, "iostats");

static struct attribute *default_attrs[] = {
&queue_requests_entry.attr,
&queue_ra_entry.attr,
&queue_max_hw_sectors_entry.attr,
&queue_max_sectors_entry.attr,
- &queue_iosched_entry.attr,
+ &elv_iosched_entry.attr,
&queue_hw_sector_size_entry.attr,
&queue_logical_block_size_entry.attr,
&queue_physical_block_size_entry.attr,
diff --git a/include/linux/sysfs.h b/include/linux/sysfs.h
index 2b91b74..3a91008 100644
--- a/include/linux/sysfs.h
+++ b/include/linux/sysfs.h
@@ -23,6 +23,7 @@ struct module;
enum sysfs_attr_lock_class {
SYSFS_ATTR_NORMAL,
SYSFS_ATTR_PM_CONTROL,
+ SYSFS_ATTR_IOSCHED,
SYSFS_NR_CLASSES,
};

--
1.5.5.6


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