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| author |   Christian Brauner <christian.brauner@ubuntu.com> | 2021-01-21 14:19:43 +0100 |
|---|---|---|
| committer | Christian Brauner <christian.brauner@ubuntu.com> | 2021-01-24 14:27:20 +0100 |
| commit | 549c7297717c32ee53f156cd949e055e601f67bb (patch) | |
| tree | d096bc02f780bdee69a701952d5568f4be9972c1 /fs/ramfs/inode.c | |
| parent | exec: handle idmapped mounts (diff) | |
| download | linux-dev-549c7297717c32ee53f156cd949e055e601f67bb.tar.xz linux-dev-549c7297717c32ee53f156cd949e055e601f67bb.zip | |
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 '')
| -rw-r--r-- | fs/ramfs/inode.c | 16 |
1 files changed, 10 insertions, 6 deletions
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; |