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| author | Christian Brauner <brauner@kernel.org> | 2024-06-07 16:55:37 +0200 |
|---|---|---|
| committer | Christian Brauner <brauner@kernel.org> | 2024-06-28 09:53:29 +0200 |
| commit | d04bccd8c19d601232ed3e3c9e248c0040167d47 (patch) | |
| tree | 31e4865f1831a61999cff6152362078f54fbf9ea /include | |
| parent | fs: simplify error handling (diff) | |
| download | linux-d04bccd8c19d601232ed3e3c9e248c0040167d47.tar.xz linux-d04bccd8c19d601232ed3e3c9e248c0040167d47.zip | |
listmount: allow listing in reverse order
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>
Diffstat (limited to 'include')
| -rw-r--r-- | include/uapi/linux/mount.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/uapi/linux/mount.h b/include/uapi/linux/mount.h index ad5478dbad00..88d78de1519f 100644 --- a/include/uapi/linux/mount.h +++ b/include/uapi/linux/mount.h @@ -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 */ |