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dm cache: drop redundant origin size check

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The cache target already exposes the origin device through
cache_iterate_devices(), which allows dm-table to call
device_area_is_invalid() and verify that the mapping fits inside the
underlying block device.

The explicit ti->len > origin_sectors test in parse_origin_dev() is
therefore redundant. Drop this check and rely on the core device
validation instead. This changes the user-visible error string when the
origin is too small, but preserves the failure behaviour.

Signed-off-by: Li Chen <me@linux.beauty>
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
This commit is contained in:
Li Chen 2025-12-10 11:17:56 +08:00 committed by Mikulas Patocka
parent c1881c74f4
commit a2f0a98b13
1 changed files with 0 additions and 7 deletions
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7
drivers/md/dm-cache-target.c
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@ -2099,7 +2099,6 @@ static int parse_cache_dev(struct cache_args *ca, struct dm_arg_set *as,
static int parse_origin_dev(struct cache_args *ca, struct dm_arg_set *as,
char **error)
{
sector_t origin_sectors;
int r;
if (!at_least_one_arg(as, error))
@ -2112,12 +2111,6 @@ static int parse_origin_dev(struct cache_args *ca, struct dm_arg_set *as,
return r;
}
origin_sectors = get_dev_size(ca->origin_dev);
if (ca->ti->len > origin_sectors) {
*error = "Device size larger than cached device";
return -EINVAL;
}
return 0;
}