On Mon, Mar 08, 2021 at 10:16:07AM +0800, JeffleXu wrote:
On 3/7/21 11:09 PM, Greg KH wrote:
On Fri, Mar 05, 2021 at 02:46:23PM +0800, Jeffle Xu wrote:
commit a4c8dd9c2d0987cf542a2a0c42684c9c6d78a04e upstream.
According to the definition of dm_iterate_devices_fn:
- This function must iterate through each section of device used by the
- target until it encounters a non-zero return code, which it then returns.
- Returns zero if no callout returned non-zero.
For some target type (e.g. dm-stripe), one call of iterate_devices() may iterate multiple underlying devices internally, in which case a non-zero return code returned by iterate_devices_callout_fn will stop the iteration in advance. No iterate_devices_callout_fn should return non-zero unless device iteration should stop.
Rename dm_table_requires_stable_pages() to dm_table_any_dev_attr() and elevate it for reuse to stop iterating (and return non-zero) on the first device that causes iterate_devices_callout_fn to return non-zero. Use dm_table_any_dev_attr() to properly iterate through devices.
Rename device_is_nonrot() to device_is_rotational() and invert logic accordingly to fix improper disposition.
Fixes: c3c4555edd10 ("dm table: clear add_random unless all devices have it set") Fixes: 4693c9668fdc ("dm table: propagate non rotational flag") Cc: stable@vger.kernel.org Signed-off-by: Jeffle Xu jefflexu@linux.alibaba.com Signed-off-by: Mike Snitzer snitzer@redhat.com [jeffle: no stable writes]
drivers/md/dm-table.c | 71 ++++++++++++++++++++++++++++--------------- 1 file changed, 47 insertions(+), 24 deletions(-)
diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c index 5d120c3cee57..ba56be34cd5d 100644 --- a/drivers/md/dm-table.c +++ b/drivers/md/dm-table.c @@ -1306,6 +1306,46 @@ struct dm_target *dm_table_find_target(struct dm_table *t, sector_t sector) return &t->targets[(KEYS_PER_NODE * n) + k]; } +/*
- type->iterate_devices() should be called when the sanity check needs to
- iterate and check all underlying data devices. iterate_devices() will
- iterate all underlying data devices until it encounters a non-zero return
- code, returned by whether the input iterate_devices_callout_fn, or
- iterate_devices() itself internally.
- For some target type (e.g. dm-stripe), one call of iterate_devices() may
- iterate multiple underlying devices internally, in which case a non-zero
- return code returned by iterate_devices_callout_fn will stop the iteration
- in advance.
- Cases requiring _any_ underlying device supporting some kind of attribute,
- should use the iteration structure like dm_table_any_dev_attr(), or call
- it directly. @func should handle semantics of positive examples, e.g.
- capable of something.
- Cases requiring _all_ underlying devices supporting some kind of attribute,
- should use the iteration structure like dm_table_supports_nowait() or
- dm_table_supports_discards(). Or introduce dm_table_all_devs_attr() that
- uses an @anti_func that handle semantics of counter examples, e.g. not
- capable of something. So: return !dm_table_any_dev_attr(t, anti_func);
- */
+static bool dm_table_any_dev_attr(struct dm_table *t,
iterate_devices_callout_fn func)+{
- struct dm_target *ti;
- unsigned int i;
- for (i = 0; i < dm_table_get_num_targets(t); i++) {
ti = dm_table_get_target(t, i);if (ti->type->iterate_devices &&ti->type->iterate_devices(ti, func, NULL))return true;}- return false;
+}
static int count_device(struct dm_target *ti, struct dm_dev *dev, sector_t start, sector_t len, void *data) { @@ -1476,12 +1516,12 @@ static bool dm_table_discard_zeroes_data(struct dm_table *t) return true; } -static int device_is_nonrot(struct dm_target *ti, struct dm_dev *dev,
sector_t start, sector_t len, void *data)+static int device_is_rotational(struct dm_target *ti, struct dm_dev *dev,
sector_t start, sector_t len, void *data){ struct request_queue *q = bdev_get_queue(dev->bdev);
- return q && blk_queue_nonrot(q);
- return q && !blk_queue_nonrot(q);
} static int device_is_not_random(struct dm_target *ti, struct dm_dev *dev, @@ -1500,23 +1540,6 @@ static int queue_supports_sg_merge(struct dm_target *ti, struct dm_dev *dev, return q && !test_bit(QUEUE_FLAG_NO_SG_MERGE, &q->queue_flags); } -static bool dm_table_all_devices_attribute(struct dm_table *t,
iterate_devices_callout_fn func)-{
- struct dm_target *ti;
- unsigned i = 0;
- while (i < dm_table_get_num_targets(t)) {
ti = dm_table_get_target(t, i++);if (!ti->type->iterate_devices ||!ti->type->iterate_devices(ti, func, NULL))return false;- }
- return true;
-}
static int device_not_write_same_capable(struct dm_target *ti, struct dm_dev *dev, sector_t start, sector_t len, void *data) { @@ -1607,10 +1630,10 @@ void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q, q->limits.discard_zeroes_data = 0; /* Ensure that all underlying devices are non-rotational. */
- if (dm_table_all_devices_attribute(t, device_is_nonrot))
queue_flag_set_unlocked(QUEUE_FLAG_NONROT, q);- else
- if (dm_table_any_dev_attr(t, device_is_rotational)) queue_flag_clear_unlocked(QUEUE_FLAG_NONROT, q);
- else
queue_flag_set_unlocked(QUEUE_FLAG_NONROT, q);if (!dm_table_supports_write_same(t)) q->limits.max_write_same_sectors = 0; @@ -1628,7 +1651,7 @@ void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q, * Clear QUEUE_FLAG_ADD_RANDOM if any underlying device does not * have it set. */
- if (blk_queue_add_random(q) && dm_table_all_devices_attribute(t, device_is_not_random))
- if (blk_queue_add_random(q) && dm_table_any_dev_attr(t, device_is_not_random)) queue_flag_clear_unlocked(QUEUE_FLAG_ADD_RANDOM, q);
/* -- 2.27.0
This patch breaks the build :(
Please always test-build your patches.
Sorry, could you please attach your fail log or steps to reproduce it? I can't reproduce it with 'make allyesconfig && make' on x86.
Though I indeed know that this patch has one style problem found by checpatch.py, though it's inherited from the upstream patch...
ERROR:CODE_INDENT: code indent should use tabs where possible #77: FILE: drivers/md/dm-table.c:1333: + }$
drivers/md/dm-table.c: In function ‘dm_table_set_restrictions’: drivers/md/dm-table.c:1641:6: error: implicit declaration of function ‘dm_table_all_devices_attribute’ [-Werror=implicit-function-declaration] 1641 | if (dm_table_all_devices_attribute(t, queue_supports_sg_merge)) | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ cc1: some warnings being treated as errors
Is the error. Try 'allmodconfig', that might provide you with more config options. I have attached the .config file I used to build this here.
thanks,
greg k-h