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Commit v4.13-rc1~137^2~13 (and a follow-up fix v4.14-rc4~20^2~3
that changed alignment) introduced an additional hidden field
in the structure returned by DM_LIST_DEVICES ioctl command
that contains event_nr information.
Unfortunately, we can't test it for now, but looks like it kinda works:
# ./strace -v -eioctl -y dmsetup ls
ioctl(3</dev/mapper/control>, DM_VERSION, {version=4.0.0,
data_size=16384, flags=DM_EXISTS_FLAG} => {version=4.37.0,
data_size=16384, flags=DM_EXISTS_FLAG}) = 0
ioctl(3</dev/mapper/control>, DM_LIST_DEVICES, {version=4.0.0,
data_size=16384, data_start=312, flags=DM_EXISTS_FLAG} =>
{version=4.37.0, data_size=408, data_start=312, flags=DM_EXISTS_FLAG,
{dev=makedev(253, 1), name="fedoratesting--30-swap", event_nr=0},
{dev=makedev(253, 0), name="fedoratesting--30-root"}}) = 0
fedoratesting--30-swap (253:1)
fedoratesting--30-root (253:0)
* dm.c (dm_decode_dm_name_list): Obtain the amount of bytes copied
during printing device name, print event number if there's a suitable
gap present and the DM version is high enough.
* NEWS: Mention it.
Return RVAL_DECODED if we can't decode command in order to avoid being
called on exiting.
* dm.c (dm_ioctl): Return RVAL_DECODED instead of 0 if command can't be
decoded.
* print_dev_t.c: New file.
* Makefile.am (strace_SOURCES): Add it.
* defs.h (print_dev_t): New prototype.
* dm.c: Do not include <sys/sysmacros.h>.
(dm_decode_device, dm_print_dev, dm_decode_dm_name_list): Use
print_dev_t function for printing device numbers.
* mknod.c: Do not include <sys/sysmacros.h>.
(decode_mknod): Use print_dev_t function for printing device number.
* print_struct_stat.c: Do not include <sys/sysmacros.h>.
(print_struct_stat): Use print_dev_t function for printing device
numbers.
Co-authored-by: Dmitry V. Levin <ldv@altlinux.org>
Remove temporary types created for transition from long
to kernel_ulong_t.
Automatically replace kernel_scno_t and kernel_ureg_t with
kernel_ulong_t using
$ git grep -El 'kernel_(scno|ureg)_t' |
xargs sed -ri 's/kernel_(scno|ureg)_t/kernel_ulong_t/g'
* kernel_types.h (kernel_scno_t, kernel_ureg_t): Remove.
All users updated.
* defs.h (DECL_IOCTL): Change arg type from long to kernel_ureg_t.
* dm.c (dm_known_ioctl, dm_ioctl): Likewise.
* file_ioctl.c (file_ioctl): Likewise.
* fs_x_ioctl.c (fs_x_ioctl): Likewise.
* ioctl.c (ioctl_decode): Likewise.
* loop.c (decode_loop_info, decode_loop_info64): Change addr type
from long to kernel_ureg_t.
(loop_ioctl): Change arg type from long to kernel_ureg_t.
* ptp.c (ptp_ioctl): Likewise.
* scsi.c (print_sg_io_v3_req, print_sg_io_v3_res, print_sg_io_v4_req,
print_sg_io_v4_res, scsi_ioctl): Likewise.
* sock.c (print_ifreq, sock_ioctl): Likewise.
(decode_ifconf): Change addr type from long to kernel_ureg_t.
* term.c (decode_termios, decode_termio, decode_winsize, decode_ttysize,
decode_modem_flags): Likewise.
(term_ioctl): Change arg type from long to kernel_ureg_t.
* ubi.c (ubi_ioctl): Likewise.
* userfaultfd.c (uffdio_ioctl): Likewise.
* dm.c (dm_decode_dm_target_spec, dm_decode_dm_target_deps,
dm_decode_dm_name_list, dm_decode_dm_target_versions,
dm_decode_dm_target_msg, dm_decode_string): Change address argument type
from unsigned long to kernel_ureg_t.