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authorChristian Brauner2021-01-21 14:19:43 +0100
committerChristian Brauner2021-01-24 14:27:20 +0100
commit549c7297717c32ee53f156cd949e055e601f67bb (patch)
treed096bc02f780bdee69a701952d5568f4be9972c1 /fs/ramfs
parent1ab29965b30599c797266eb3b970b4e6c8de3672 (diff)
fs: make helpers idmap mount aware
Extend some inode methods with an additional user namespace argument. A filesystem that is aware of idmapped mounts will receive the user namespace the mount has been marked with. This can be used for additional permission checking and also to enable filesystems to translate between uids and gids if they need to. We have implemented all relevant helpers in earlier patches. As requested we simply extend the exisiting inode method instead of introducing new ones. This is a little more code churn but it's mostly mechanical and doesnt't leave us with additional inode methods. Link: https://lore.kernel.org/r/20210121131959.646623-25-christian.brauner@ubuntu.com Cc: Christoph Hellwig <hch@lst.de> Cc: David Howells <dhowells@redhat.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: linux-fsdevel@vger.kernel.org Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Diffstat (limited to 'fs/ramfs')
-rw-r--r--fs/ramfs/file-nommu.c5
-rw-r--r--fs/ramfs/inode.c16
2 files changed, 13 insertions, 8 deletions
diff --git a/fs/ramfs/file-nommu.c b/fs/ramfs/file-nommu.c
index f0358fe410d3..ba3525ccc27e 100644
--- a/fs/ramfs/file-nommu.c
+++ b/fs/ramfs/file-nommu.c
@@ -22,7 +22,7 @@
#include <linux/uaccess.h>
#include "internal.h"
-static int ramfs_nommu_setattr(struct dentry *, struct iattr *);
+static int ramfs_nommu_setattr(struct user_namespace *, struct dentry *, struct iattr *);
static unsigned long ramfs_nommu_get_unmapped_area(struct file *file,
unsigned long addr,
unsigned long len,
@@ -158,7 +158,8 @@ static int ramfs_nommu_resize(struct inode *inode, loff_t newsize, loff_t size)
* handle a change of attributes
* - we're specifically interested in a change of size
*/
-static int ramfs_nommu_setattr(struct dentry *dentry, struct iattr *ia)
+static int ramfs_nommu_setattr(struct user_namespace *mnt_userns,
+ struct dentry *dentry, struct iattr *ia)
{
struct inode *inode = d_inode(dentry);
unsigned int old_ia_valid = ia->ia_valid;
diff --git a/fs/ramfs/inode.c b/fs/ramfs/inode.c
index 3fd4326f36b5..3c2658c8fde0 100644
--- a/fs/ramfs/inode.c
+++ b/fs/ramfs/inode.c
@@ -101,7 +101,8 @@ struct inode *ramfs_get_inode(struct super_block *sb,
*/
/* SMP-safe */
static int
-ramfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t dev)
+ramfs_mknod(struct user_namespace *mnt_userns, struct inode *dir,
+ struct dentry *dentry, umode_t mode, dev_t dev)
{
struct inode * inode = ramfs_get_inode(dir->i_sb, dir, mode, dev);
int error = -ENOSPC;
@@ -115,20 +116,23 @@ ramfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t dev)
return error;
}
-static int ramfs_mkdir(struct inode * dir, struct dentry * dentry, umode_t mode)
+static int ramfs_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
+ struct dentry *dentry, umode_t mode)
{
- int retval = ramfs_mknod(dir, dentry, mode | S_IFDIR, 0);
+ int retval = ramfs_mknod(&init_user_ns, dir, dentry, mode | S_IFDIR, 0);
if (!retval)
inc_nlink(dir);
return retval;
}
-static int ramfs_create(struct inode *dir, struct dentry *dentry, umode_t mode, bool excl)
+static int ramfs_create(struct user_namespace *mnt_userns, struct inode *dir,
+ struct dentry *dentry, umode_t mode, bool excl)
{
- return ramfs_mknod(dir, dentry, mode | S_IFREG, 0);
+ return ramfs_mknod(&init_user_ns, dir, dentry, mode | S_IFREG, 0);
}
-static int ramfs_symlink(struct inode * dir, struct dentry *dentry, const char * symname)
+static int ramfs_symlink(struct user_namespace *mnt_userns, struct inode *dir,
+ struct dentry *dentry, const char *symname)
{
struct inode *inode;
int error = -ENOSPC;