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Linux 4.8 compat: new s_user_ns member of struct super_block

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Kernel 4.8 paved the way to enabling mounting a file system inside a
non-init user namespace. To facilitate this a s_user_ns member was
added holding the userns in which the filesystem's instance was
mounted. This enables doing the uid/gid translation relative to
this particular username space and not the default init_user_ns.

Signed-off-by: Nikolay Borisov <n.borisov.lkml@gmail.com>
Signed-off-by: Chunwei Chen <david.chen@osnexus.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #4928
This commit is contained in:
Nikolay Borisov
2016-08-03 20:19:04 +03:00
committed by Brian Behlendorf
parent cf2731e65b
commit 938cfeb0f2
3 changed files with 39 additions and 0 deletions
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include/linux/vfs_compat.h
+17
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@@ -356,7 +356,11 @@ static inline struct inode *file_inode(const struct file *f)
#ifdef HAVE_KUID_HELPERS
static inline uid_t zfs_uid_read_impl(struct inode *ip)
{
#ifdef HAVE_SUPER_USER_NS
return (from_kuid(ip->i_sb->s_user_ns, ip->i_uid));
#else
return (from_kuid(kcred->user_ns, ip->i_uid));
#endif
}
static inline uid_t zfs_uid_read(struct inode *ip)
@@ -366,7 +370,11 @@ static inline uid_t zfs_uid_read(struct inode *ip)
static inline gid_t zfs_gid_read_impl(struct inode *ip)
{
#ifdef HAVE_SUPER_USER_NS
return (from_kgid(ip->i_sb->s_user_ns, ip->i_gid));
#else
return (from_kgid(kcred->user_ns, ip->i_gid));
#endif
}
static inline gid_t zfs_gid_read(struct inode *ip)
@@ -376,13 +384,22 @@ static inline gid_t zfs_gid_read(struct inode *ip)
static inline void zfs_uid_write(struct inode *ip, uid_t uid)
{
#ifdef HAVE_SUPER_USER_NS
ip->i_uid = make_kuid(ip->i_sb->s_user_ns, uid);
#else
ip->i_uid = make_kuid(kcred->user_ns, uid);
#endif
}
static inline void zfs_gid_write(struct inode *ip, gid_t gid)
{
#ifdef HAVE_SUPER_USER_NS
ip->i_gid = make_kgid(ip->i_sb->s_user_ns, gid);
#else
ip->i_gid = make_kgid(kcred->user_ns, gid);
#endif
}
#else
static inline uid_t zfs_uid_read(struct inode *ip)
{