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2a068a1394
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
86 lines
2.5 KiB
C
86 lines
2.5 KiB
C
/*
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* Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
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* Copyright (C) 2007 The Regents of the University of California.
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* Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
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* Written by Brian Behlendorf <behlendorf1@llnl.gov>.
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* UCRL-CODE-235197
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*
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* This file is part of the SPL, Solaris Porting Layer.
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*
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* The SPL is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* The SPL is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with the SPL. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef _SPL_CRED_H
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#define _SPL_CRED_H
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#include <linux/module.h>
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#include <linux/cred.h>
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#include <sys/types.h>
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#include <sys/vfs.h>
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typedef struct cred cred_t;
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#define kcred ((cred_t *)(init_task.cred))
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#define CRED() ((cred_t *)current_cred())
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/* Linux 4.9 API change, GROUP_AT was removed */
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#ifndef GROUP_AT
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#define GROUP_AT(gi, i) ((gi)->gid[i])
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#endif
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#define KUID_TO_SUID(x) (__kuid_val(x))
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#define KGID_TO_SGID(x) (__kgid_val(x))
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#define SUID_TO_KUID(x) (KUIDT_INIT(x))
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#define SGID_TO_KGID(x) (KGIDT_INIT(x))
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#define KGIDP_TO_SGIDP(x) (&(x)->val)
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static inline uid_t zfs_uid_into_mnt(struct user_namespace *mnt_ns, uid_t uid)
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{
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if (mnt_ns)
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return (__kuid_val(make_kuid(mnt_ns, uid)));
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return (uid);
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}
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static inline gid_t zfs_gid_into_mnt(struct user_namespace *mnt_ns, gid_t gid)
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{
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if (mnt_ns)
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return (__kgid_val(make_kgid(mnt_ns, gid)));
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return (gid);
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}
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static inline uid_t zfs_uid_from_mnt(struct user_namespace *mnt_ns, uid_t uid)
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{
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if (mnt_ns)
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return (from_kuid(mnt_ns, KUIDT_INIT(uid)));
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return (uid);
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}
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static inline gid_t zfs_gid_from_mnt(struct user_namespace *mnt_ns, gid_t gid)
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{
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if (mnt_ns)
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return (from_kgid(mnt_ns, KGIDT_INIT(gid)));
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return (gid);
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}
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extern void crhold(cred_t *cr);
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extern void crfree(cred_t *cr);
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extern uid_t crgetuid(const cred_t *cr);
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extern uid_t crgetruid(const cred_t *cr);
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extern gid_t crgetgid(const cred_t *cr);
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extern int crgetngroups(const cred_t *cr);
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extern gid_t *crgetgroups(const cred_t *cr);
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extern int groupmember(gid_t gid, const cred_t *cr);
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#endif /* _SPL_CRED_H */
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