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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-10 20:49:52 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-10 20:49:52 +0000 |
commit | 55944e5e40b1be2afc4855d8d2baf4b73d1876b5 (patch) | |
tree | 33f869f55a1b149e9b7c2b7e201867ca5dd52992 /src/shared/dm-util.c | |
parent | Initial commit. (diff) | |
download | systemd-55944e5e40b1be2afc4855d8d2baf4b73d1876b5.tar.xz systemd-55944e5e40b1be2afc4855d8d2baf4b73d1876b5.zip |
Adding upstream version 255.4.upstream/255.4
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/shared/dm-util.c')
-rw-r--r-- | src/shared/dm-util.c | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/src/shared/dm-util.c b/src/shared/dm-util.c new file mode 100644 index 0000000..66c1e13 --- /dev/null +++ b/src/shared/dm-util.c @@ -0,0 +1,45 @@ +/* SPDX-License-Identifier: LGPL-2.1-or-later */ + +#include <fcntl.h> +#include <linux/dm-ioctl.h> +#include <sys/ioctl.h> + +#include "dm-util.h" +#include "fd-util.h" +#include "string-util.h" + +int dm_deferred_remove_cancel(const char *name) { + _cleanup_close_ int fd = -EBADF; + struct message { + struct dm_ioctl dm_ioctl; + struct dm_target_msg dm_target_msg; + char msg_text[STRLEN("@cancel_deferred_remove") + 1]; + } _packed_ message = { + .dm_ioctl = { + .version = { + DM_VERSION_MAJOR, + DM_VERSION_MINOR, + DM_VERSION_PATCHLEVEL + }, + .data_size = sizeof(struct message), + .data_start = sizeof(struct dm_ioctl), + }, + .msg_text = "@cancel_deferred_remove", + }; + + assert(name); + + if (strlen(name) >= sizeof(message.dm_ioctl.name)) + return -ENODEV; /* A device with a name longer than this cannot possibly exist */ + + strncpy_exact(message.dm_ioctl.name, name, sizeof(message.dm_ioctl.name)); + + fd = open("/dev/mapper/control", O_RDWR|O_CLOEXEC); + if (fd < 0) + return -errno; + + if (ioctl(fd, DM_TARGET_MSG, &message)) + return -errno; + + return 0; +} |