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Support idmapped mount

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Adds support for idmapped mounts.  Supported as of Linux 5.12 this 
functionality allows user and group IDs to be remapped without changing 
their state on disk.  This can be useful for portable home directories
and a variety of container related use cases.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Ryan Moeller <ryan@iXsystems.com>
Signed-off-by: Youzhong Yang <yyang@mathworks.com>
Closes #12923
Closes #13671
This commit is contained in:
youzhongyang
2022-10-19 14:17:09 -04:00
committed by GitHub
parent eaaed26ffb
commit 2a068a1394
41 changed files with 1636 additions and 166 deletions
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include/os/linux/spl/sys/cred.h
+28
View File
@@ -45,6 +45,34 @@ typedef struct cred cred_t;
#define SGID_TO_KGID(x) (KGIDT_INIT(x))
#define KGIDP_TO_SGIDP(x) (&(x)->val)
static inline uid_t zfs_uid_into_mnt(struct user_namespace *mnt_ns, uid_t uid)
{
if (mnt_ns)
return (__kuid_val(make_kuid(mnt_ns, uid)));
return (uid);
}
static inline gid_t zfs_gid_into_mnt(struct user_namespace *mnt_ns, gid_t gid)
{
if (mnt_ns)
return (__kgid_val(make_kgid(mnt_ns, gid)));
return (gid);
}
static inline uid_t zfs_uid_from_mnt(struct user_namespace *mnt_ns, uid_t uid)
{
if (mnt_ns)
return (from_kuid(mnt_ns, KUIDT_INIT(uid)));
return (uid);
}
static inline gid_t zfs_gid_from_mnt(struct user_namespace *mnt_ns, gid_t gid)
{
if (mnt_ns)
return (from_kgid(mnt_ns, KGIDT_INIT(gid)));
return (gid);
}
extern void crhold(cred_t *cr);
extern void crfree(cred_t *cr);
extern uid_t crgetuid(const cred_t *cr);
include/os/linux/spl/sys/types.h
+3
View File
@@ -54,4 +54,7 @@ typedef ulong_t pgcnt_t;
typedef int major_t;
typedef int minor_t;
struct user_namespace;
typedef struct user_namespace zuserns_t;
#endif /* _SPL_TYPES_H */