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| author | Nikos Tsironis <ntsironis@arrikto.com> | 2020-03-27 17:01:11 +0300 |
|---|---|---|
| committer | Mike Snitzer <snitzer@redhat.com> | 2020-03-27 21:42:51 +0300 |
| commit | 81d5553d1288c2ec0390f02f84d71ca0f0f9f137 (patch) | |
| tree | 76cc780f85a499ce39c5cbbf585812d64625902f /drivers/md/dm-clone-metadata.h | |
| parent | 9fc06ff56845cc5ccafec52f545fc2e08d22f849 (diff) | |
| download | linux-81d5553d1288c2ec0390f02f84d71ca0f0f9f137.tar.xz | |
dm clone metadata: Fix return type of dm_clone_nr_of_hydrated_regions()
dm_clone_nr_of_hydrated_regions() returns the number of regions that
have been hydrated so far. In order to do so it employs bitmap_weight().
Until now, the return type of dm_clone_nr_of_hydrated_regions() was
unsigned long.
Because bitmap_weight() returns an int, in case BITS_PER_LONG == 64 and
the return value of bitmap_weight() is 2^31 (the maximum allowed number
of regions for a device), the result is sign extended from 32 bits to 64
bits and an incorrect value is displayed, in the status output of
dm-clone, as the number of hydrated regions.
Fix this by having dm_clone_nr_of_hydrated_regions() return an unsigned
int.
Fixes: 7431b7835f55 ("dm: add clone target")
Cc: stable@vger.kernel.org # v5.4+
Signed-off-by: Nikos Tsironis <ntsironis@arrikto.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Diffstat (limited to 'drivers/md/dm-clone-metadata.h')
| -rw-r--r-- | drivers/md/dm-clone-metadata.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/md/dm-clone-metadata.h b/drivers/md/dm-clone-metadata.h index 14af1ebd853f..d848b8799c07 100644 --- a/drivers/md/dm-clone-metadata.h +++ b/drivers/md/dm-clone-metadata.h @@ -156,7 +156,7 @@ bool dm_clone_is_range_hydrated(struct dm_clone_metadata *cmd, /* * Returns the number of hydrated regions. */ -unsigned long dm_clone_nr_of_hydrated_regions(struct dm_clone_metadata *cmd); +unsigned int dm_clone_nr_of_hydrated_regions(struct dm_clone_metadata *cmd); /* * Returns the first unhydrated region with region_nr >= @start |