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share the same backing storage by default. > This causes filesystem UUIDs to be shared between devices like /dev/sda > and /dev/sdb, leading to confusion and potential mount issues. > > For example: > # modprobe scsi_debug add_host=2 dev_size_mb=1024 > # mkfs.xfs -f /dev/sda > # wipefs /dev/sda /dev/sdb > Both devices show the same UUID, which is incorrect behavior. > > Fix this by automatically enabling separate per-host stores when > multiple hosts are created, while preserving backward compatibility > for single-host scenarios. Users can still explicitly control this > behavior via the per_host_store parameter. > > After this fix: > - Single host: Uses shared store (unchanged behavior) Does phs even have any affect for only a single scsi_debug host? I thought that phs means that each host has its own backing storage which is shared among all devices for that host. > - Multiple hosts: Automatically uses separate stores (fixes UUID issue) > - Explicit per_host_store=1: Always separate stores (unchanged behavior) > > Reported-by: Swarna Prabhu > Signed-off-by: Luis Chamberlain > --- > drivers/scsi/scsi_debug.c | 17 ++++++++++++++--- > 1 file changed, 14 insertions(+), 3 deletions(-) > > diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c > index f0eec4708ddd..4d0b17861adb 100644 > --- a/drivers/scsi/scsi_debug.c > +++ b/drivers/scsi/scsi_debug.c > @@ -8034,12 +8034,18 @@ static ssize_t add_host_store(struct device_driver *ddp, const char *buf, > bool found; > unsigned long idx; > struct sdeb_store_info *sip; > + bool uniq_uuid_required = false; > bool want_phs = (sdebug_fake_rw == 0) && sdebug_per_host_store; > int delta_hosts; > > if (sscanf(buf, "%d", &delta_hosts) != 1) > return -EINVAL; > if (delta_hosts > 0) { > + if (delta_hosts > 1) { > + uniq_uuid_required = true; > + if (sdebug_fake_rw == 0) > + want_phs = true; > + } > do { > found = false; > if (want_phs) { > @@ -8054,7 +8060,7 @@ static ssize_t add_host_store(struct device_driver *ddp, const char *buf, > else > sdebug_do_add_host(true); > } else { > - sdebug_do_add_host(false); > + sdebug_do_add_host(uniq_uuid_required); > } > } while (--delta_hosts); > } else if (delta_hosts < 0) { > @@ -8383,6 +8389,7 @@ static struct device *pseudo_primary; > static int __init scsi_debug_init(void) > { > bool want_store = (sdebug_fake_rw == 0); > + bool uniq_uuid_required = false; > unsigned long sz; > int k, ret, hosts_to_add; > int idx = -1; > @@ -8578,6 +8585,9 @@ static int __init scsi_debug_init(void) > } > > hosts_to_add = sdebug_add_host; > + if (hosts_to_add > 1) > + uniq_uuid_required = true; > + > sdebug_add_host = 0; > > sdebug_debugfs_root = debugfs_create_dir("scsi_debug", NULL); > @@ -8593,8 +8603,9 @@ static int __init scsi_debug_init(void) > break; > } > } else { > - ret = sdebug_do_add_host(want_store && > - sdebug_per_host_store); > + bool use_store = want_store && > + (sdebug_per_host_store || uniq_uuid_required); > + ret = sdebug_do_add_host(use_store); > if (ret < 0) { > pr_err("add_host k=%d error=%d\n", k, -ret); > break;