util-linux is about to implement listmount() and statmount() support. Karel requested the ability to scan the mount table in backwards order because that's what libmount currently does in order to get the latest mount first. We currently don't support this in listmount(). Add a new LISTMOUNT_REVERSE flag to allow listing mounts in reverse order. For example, listing all child mounts of /sys without LISTMOUNT_REVERSE gives: /sys/kernel/security @ mnt_id: 4294968369 /sys/fs/cgroup @ mnt_id: 4294968370 /sys/firmware/efi/efivars @ mnt_id: 4294968371 /sys/fs/bpf @ mnt_id: 4294968372 /sys/kernel/tracing @ mnt_id: 4294968373 /sys/kernel/debug @ mnt_id: 4294968374 /sys/fs/fuse/connections @ mnt_id: 4294968375 /sys/kernel/config @ mnt_id: 4294968376 whereas with LISTMOUNT_REVERSE it gives: /sys/kernel/config @ mnt_id: 4294968376 /sys/fs/fuse/connections @ mnt_id: 4294968375 /sys/kernel/debug @ mnt_id: 4294968374 /sys/kernel/tracing @ mnt_id: 4294968373 /sys/fs/bpf @ mnt_id: 4294968372 /sys/firmware/efi/efivars @ mnt_id: 4294968371 /sys/fs/cgroup @ mnt_id: 4294968370 /sys/kernel/security @ mnt_id: 4294968369
Showing the changes to include/uapi (1 of 2 files). Show all
Unified · Split
| @@ -207,5 +207,6 @@ struct mnt_id_req { · 206 unmodified lines | ||
| 207 | 207 | * Special @mnt_id values that can be passed to listmount |
| 208 | 208 | */ |
| 209 | 209 | #define LSMT_ROOT 0xffffffffffffffff /* root mount */ |
| 210 | +#define LISTMOUNT_REVERSE (1 << 0) /* List later mounts first */ | |
| 210 | 211 | |
| 211 | 212 | #endif /* _UAPI_LINUX_MOUNT_H */ |