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authorMike Snitzer <snitzer@kernel.org>2022-05-31 19:16:49 +0300
committerMike Snitzer <snitzer@kernel.org>2022-05-31 21:44:17 +0300
commit9571f829f30a89b888ec4c3a72f5a04573f0e058 (patch)
treee1c49996912028edc6a6b51d551493c8ec74db87 /drivers/md
parentca522482e3eafd005b8d4e8b1331c911505a58d5 (diff)
downloadlinux-9571f829f30a89b888ec4c3a72f5a04573f0e058.tar.xz
dm table: fix dm_table_supports_poll to return false if no data devices
It was reported that the "generic/250" test in xfstests (which uses the dm-error target) demonstrates a regression where the kernel crashes in bioset_exit(). Since commit cfc97abcbe0b ("dm: conditionally enable BIOSET_PERCPU_CACHE for dm_io bioset") the bioset_init() for the dm_io bioset will setup the bioset's per-cpu alloc cache if all devices have QUEUE_FLAG_POLL set. But there was an bug where a target that doesn't have any data devices (and that doesn't even set the .iterate_devices dm target callback) will incorrectly return true from dm_table_supports_poll(). Fix this by updating dm_table_supports_poll() to follow dm-table.c's well-worn pattern for testing that _all_ targets in a DM table do in fact have underlying devices that set QUEUE_FLAG_POLL. NOTE: An additional block fix is still needed so that bio_alloc_cache_destroy() clears the bioset's ->cache member. Otherwise, a DM device's table reload that transitions the DM device's bioset from using a per-cpu alloc cache to _not_ using one will result in bioset_exit() crashing in bio_alloc_cache_destroy() because dm's dm_io bioset ("io_bs") was left with a stale ->cache member. Fixes: cfc97abcbe0b ("dm: conditionally enable BIOSET_PERCPU_CACHE for dm_io bioset") Reported-by: Matthew Wilcox <willy@infradead.org> Reported-by: Dave Chinner <david@fromorbit.com> Signed-off-by: Mike Snitzer <snitzer@kernel.org>
Diffstat (limited to 'drivers/md')
-rw-r--r--drivers/md/dm-table.c19
1 files changed, 15 insertions, 4 deletions
diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
index a37c7b763643..0e833a154b31 100644
--- a/drivers/md/dm-table.c
+++ b/drivers/md/dm-table.c
@@ -1005,7 +1005,7 @@ bool dm_table_request_based(struct dm_table *t)
return __table_type_request_based(dm_table_get_type(t));
}
-static int dm_table_supports_poll(struct dm_table *t);
+static bool dm_table_supports_poll(struct dm_table *t);
static int dm_table_alloc_md_mempools(struct dm_table *t, struct mapped_device *md)
{
@@ -1027,7 +1027,7 @@ static int dm_table_alloc_md_mempools(struct dm_table *t, struct mapped_device *
per_io_data_size = max(per_io_data_size, ti->per_io_data_size);
min_pool_size = max(min_pool_size, ti->num_flush_bios);
}
- poll_supported = !!dm_table_supports_poll(t);
+ poll_supported = dm_table_supports_poll(t);
}
t->mempools = dm_alloc_md_mempools(md, type, per_io_data_size, min_pool_size,
@@ -1547,9 +1547,20 @@ static int count_device(struct dm_target *ti, struct dm_dev *dev,
return 0;
}
-static int dm_table_supports_poll(struct dm_table *t)
+static bool dm_table_supports_poll(struct dm_table *t)
{
- return !dm_table_any_dev_attr(t, device_not_poll_capable, NULL);
+ 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, device_not_poll_capable, NULL))
+ return false;
+ }
+
+ return true;
}
/*