On Fri, Mar 05, 2021 at 02:57:19PM +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
drivers/md/dm-table.c | 97 +++++++++++++++++++++++-------------------- 1 file changed, 51 insertions(+), 46 deletions(-)
diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c index 98be040cf958..bf704d238662 100644 --- a/drivers/md/dm-table.c +++ b/drivers/md/dm-table.c @@ -1376,6 +1376,46 @@ 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) { @@ -1692,12 +1732,12 @@ static int dm_table_supports_dax_write_cache(struct dm_table *t) return false; } -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, @@ -1708,23 +1748,6 @@ static int device_is_not_random(struct dm_target *ti, struct dm_dev *dev, return q && !blk_queue_add_random(q); } -static bool dm_table_all_devices_attribute(struct dm_table *t,
iterate_devices_callout_fn func)-{
- struct dm_target *ti;
- unsigned 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 false;- }
- return true;
-}
static int device_no_partial_completion(struct dm_target *ti, struct dm_dev *dev, sector_t start, sector_t len, void *data) { @@ -1863,27 +1886,6 @@ static int device_requires_stable_pages(struct dm_target *ti, return q && bdi_cap_stable_pages_required(q->backing_dev_info); } -/*
- If any underlying device requires stable pages, a table must require
- them as well. Only targets that support iterate_devices are considered:
- don't want error, zero, etc to require stable pages.
- */
-static bool dm_table_requires_stable_pages(struct dm_table *t) -{
- struct dm_target *ti;
- unsigned 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, device_requires_stable_pages, NULL))return true;- }
- return false;
-}
void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q, struct queue_limits *limits) { @@ -1928,10 +1930,10 @@ void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q, dax_write_cache(t->md->dax_dev, true); /* Ensure that all underlying devices are non-rotational. */
- if (dm_table_all_devices_attribute(t, device_is_nonrot))
blk_queue_flag_set(QUEUE_FLAG_NONROT, q);- else
- if (dm_table_any_dev_attr(t, device_is_rotational)) blk_queue_flag_clear(QUEUE_FLAG_NONROT, q);
- else
blk_queue_flag_set(QUEUE_FLAG_NONROT, q);if (!dm_table_supports_write_same(t)) q->limits.max_write_same_sectors = 0; @@ -1943,8 +1945,11 @@ void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q, /* * Some devices don't use blk_integrity but still want stable pages * because they do their own checksumming.
* If any underlying device requires stable pages, a table must require* them as well. Only targets that support iterate_devices are considered:* don't want error, zero, etc to require stable pages.
- if (dm_table_requires_stable_pages(t))
- if (dm_table_any_dev_attr(t, device_requires_stable_pages)) q->backing_dev_info->capabilities |= BDI_CAP_STABLE_WRITES; else q->backing_dev_info->capabilities &= ~BDI_CAP_STABLE_WRITES;
@@ -1955,7 +1960,7 @@ 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)) blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, q);
/* -- 2.27.0
This patch breaks the build, how did you test it???