Lennart Poettering
5af1038123
Subscribers to block-device uevents need to apply the same filter set
blockdev_list() uses over the bulk enumeration, one device at a time.
Pull the per-device body out as blockdev_list_one(), expose
blockdev_list_get_root_devnos() so callers can compute the IGNORE_ROOT
devnos once up-front, and introduce a 4-valued return code so callers
can distinguish:
MATCH_NO - fails a static filter (subsystem, ZRAM, IGNORE_ROOT,
REQUIRE_PARTITION_SCANNING, REQUIRE_LUKS)
MATCH_YES - fully matches
MATCH_FILTERED - passes static filters but fails a dynamic one
(IGNORE_EMPTY, IGNORE_READ_ONLY) - useful to surface
as "device just became invisible" transitions when
the kernel flips size/ro at runtime
MATCH_SKIPPED - soft error during filter evaluation; callers should
treat this like MATCH_FILTERED, but the distinct code
makes the soft failure visible rather than silently
swallowed inside blockdev_list_one()
*ret is initialized on every non-negative return (BLOCK_DEVICE_NULL for
MATCH_NO / MATCH_SKIPPED, fully populated for MATCH_YES / MATCH_FILTERED),
and untouched on negative return. blockdev_list() itself collapses
everything except MATCH_YES back into "skip", so existing callers see
no behavior change.
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