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fs: add an ioctl to get the mnt ns id from nsfs

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In order to utilize the listmount() and statmount() extensions that
allow us to call them on different namespaces we need a way to get the
mnt namespace id from user space.  Add an ioctl to nsfs that will allow
us to extract the mnt namespace id in order to make these new extensions
usable.

Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Link: https://lore.kernel.org/r/180449959d5a756af7306d6bda55f41b9d53e3cb.1719243756.git.josef@toxicpanda.com
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Josef Bacik
2024-06-24 11:49:50 -04:00
committed by Christian Brauner
parent 71aacb4c8c
commit e8e43a1fcc
2 changed files with 16 additions and 0 deletions
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2
include/uapi/linux/nsfs.h
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@@ -15,5 +15,7 @@
#define NS_GET_NSTYPE _IO(NSIO, 0x3)
/* Get owner UID (in the caller's user namespace) for a user namespace */
#define NS_GET_OWNER_UID _IO(NSIO, 0x4)
/* Get the id for a mount namespace */
#define NS_GET_MNTNS_ID _IO(NSIO, 0x5)
#endif /* __LINUX_NSFS_H */