https://github.com/torvalds/linux
dm-multipath accepts 0 path mapping. # echo '0 2097152 multipath 0 0 0 0' | dmsetup create newdev Such a mapping can be used to release underlying devices while still holding requests in its queue until working paths come back. However, once the multipath device is created over blk-mq devices, it rejects reloading of 0 path mapping: # echo '0 2097152 multipath 0 0 1 1 queue-length 0 1 1 /dev/sda 1' \ | dmsetup create mpath1 # echo '0 2097152 multipath 0 0 0 0' | dmsetup load mpath1 device-mapper: reload ioctl on mpath1 failed: Invalid argument Command failed With following kernel message: device-mapper: ioctl: can't change device type after initial table load. DM tries to inherit the current table type using dm_table_set_type() but it doesn't work as expected because of unnecessary check about whether the target type is hybrid or not. Hybrid type is for targets that work as either request-based or bio-based and not required for blk-mq or non blk-mq checking. Fixes: 65803c205983 ("dm table: train hybrid target type detection to select blk-mq if appropriate") Signed-off-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com>
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dm: fix reload failure of 0 path multipath mapping on blk-mq devices
File | Mode | Size |
---|---|---|
Makefile | -rw-r--r-- | 377 bytes |
compat.c | -rw-r--r-- | 19.1 KB |
compat_mq.c | -rw-r--r-- | 3.9 KB |
ipc_sysctl.c | -rw-r--r-- | 5.4 KB |
mq_sysctl.c | -rw-r--r-- | 2.9 KB |
mqueue.c | -rw-r--r-- | 35.3 KB |
msg.c | -rw-r--r-- | 23.2 KB |
msgutil.c | -rw-r--r-- | 3.6 KB |
namespace.c | -rw-r--r-- | 4.0 KB |
sem.c | -rw-r--r-- | 55.2 KB |
shm.c | -rw-r--r-- | 32.5 KB |
syscall.c | -rw-r--r-- | 2.3 KB |
util.c | -rw-r--r-- | 21.1 KB |
util.h | -rw-r--r-- | 6.4 KB |
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