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fs: add i_user_ns() helper 

Since we'll be passing the filesystem's idmapping in even more places in
the following patches and we do already dereference struct inode to get
to the filesystem's idmapping multiple times add a tiny helper.

Link: https://lore.kernel.org/r/20211123114227.3124056-10-brauner@kernel.org (v1)
Link: https://lore.kernel.org/r/20211130121032.3753852-10-brauner@kernel.org (v2)
Link: https://lore.kernel.org/r/20211203111707.3901969-10-brauner@kernel.org
Cc: Seth Forshee <sforshee@digitalocean.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Al Viro <viro@zeniv.linux.org.uk>
CC: linux-fsdevel@vger.kernel.org
Reviewed-by: Amir Goldstein <amir73il@gmail.com>
Reviewed-by: Seth Forshee <sforshee@digitalocean.com>
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
This commit is contained in:
Christian Brauner 2021-12-03 12:17:06 +01:00
parent 209188ce75
commit a1ec9040a2
No known key found for this signature in database
GPG Key ID: 91C61BC06578DCA2
1 changed files with 9 additions and 4 deletions
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13
include/linux/fs.h
View File

@ -1600,6 +1600,11 @@ struct super_block {
struct list_head s_inodes_wb; /* writeback inodes */
} __randomize_layout;
static inline struct user_namespace *i_user_ns(const struct inode *inode)
{
return inode->i_sb->s_user_ns;
}
/* Helper functions so that in most cases filesystems will
* not need to deal directly with kuid_t and kgid_t and can
* instead deal with the raw numeric values that are stored
@ -1607,22 +1612,22 @@ struct super_block {
*/
static inline uid_t i_uid_read(const struct inode *inode)
{
return from_kuid(inode->i_sb->s_user_ns, inode->i_uid);
return from_kuid(i_user_ns(inode), inode->i_uid);
}
static inline gid_t i_gid_read(const struct inode *inode)
{
return from_kgid(inode->i_sb->s_user_ns, inode->i_gid);
return from_kgid(i_user_ns(inode), inode->i_gid);
}
static inline void i_uid_write(struct inode *inode, uid_t uid)
{
inode->i_uid = make_kuid(inode->i_sb->s_user_ns, uid);
inode->i_uid = make_kuid(i_user_ns(inode), uid);
}
static inline void i_gid_write(struct inode *inode, gid_t gid)
{
inode->i_gid = make_kgid(inode->i_sb->s_user_ns, gid);
inode->i_gid = make_kgid(i_user_ns(inode), gid);
}
/**