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listmount: allow listing in reverse order

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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

Link: https://lore.kernel.org/r/20240607-vfs-listmount-reverse-v1-4-7877a2bfa5e5@kernel.org
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Christian Brauner
2024-06-07 16:55:37 +02:00
parent 17e7016128
commit d04bccd8c1
2 changed files with 50 additions and 10 deletions
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1
include/uapi/linux/mount.h
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@@ -207,5 +207,6 @@ struct mnt_id_req {
* Special @mnt_id values that can be passed to listmount
*/
#define LSMT_ROOT 0xffffffffffffffff /* root mount */
#define LISTMOUNT_REVERSE (1 << 0) /* List later mounts first */
#endif /* _UAPI_LINUX_MOUNT_H */