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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>
253 lines
5.8 KiB
C
253 lines
5.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* linux/fs/bad_inode.c
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*
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* Copyright (C) 1997, Stephen Tweedie
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*
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* Provide stub functions for unreadable inodes
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*
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* Fabian Frederick : August 2003 - All file operations assigned to EIO
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*/
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#include <linux/fs.h>
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#include <linux/export.h>
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#include <linux/stat.h>
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#include <linux/time.h>
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#include <linux/namei.h>
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#include <linux/poll.h>
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#include <linux/fiemap.h>
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static int bad_file_open(struct inode *inode, struct file *filp)
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{
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return -EIO;
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}
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static const struct file_operations bad_file_ops =
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{
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.open = bad_file_open,
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};
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static int bad_inode_create(struct user_namespace *mnt_userns,
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struct inode *dir, struct dentry *dentry,
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umode_t mode, bool excl)
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{
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return -EIO;
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}
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static struct dentry *bad_inode_lookup(struct inode *dir,
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struct dentry *dentry, unsigned int flags)
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{
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return ERR_PTR(-EIO);
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}
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static int bad_inode_link (struct dentry *old_dentry, struct inode *dir,
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struct dentry *dentry)
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{
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return -EIO;
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}
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static int bad_inode_unlink(struct inode *dir, struct dentry *dentry)
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{
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return -EIO;
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}
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static int bad_inode_symlink(struct user_namespace *mnt_userns,
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struct inode *dir, struct dentry *dentry,
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const char *symname)
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{
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return -EIO;
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}
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static int bad_inode_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
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struct dentry *dentry, umode_t mode)
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{
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return -EIO;
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}
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static int bad_inode_rmdir (struct inode *dir, struct dentry *dentry)
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{
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return -EIO;
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}
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static int bad_inode_mknod(struct user_namespace *mnt_userns, struct inode *dir,
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struct dentry *dentry, umode_t mode, dev_t rdev)
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{
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return -EIO;
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}
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static int bad_inode_rename2(struct user_namespace *mnt_userns,
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struct inode *old_dir, struct dentry *old_dentry,
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struct inode *new_dir, struct dentry *new_dentry,
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unsigned int flags)
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{
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return -EIO;
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}
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static int bad_inode_readlink(struct dentry *dentry, char __user *buffer,
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int buflen)
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{
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return -EIO;
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}
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static int bad_inode_permission(struct user_namespace *mnt_userns,
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struct inode *inode, int mask)
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{
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return -EIO;
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}
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static int bad_inode_getattr(struct user_namespace *mnt_userns,
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const struct path *path, struct kstat *stat,
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u32 request_mask, unsigned int query_flags)
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{
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return -EIO;
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}
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static int bad_inode_setattr(struct user_namespace *mnt_userns,
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struct dentry *direntry, struct iattr *attrs)
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{
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return -EIO;
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}
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static ssize_t bad_inode_listxattr(struct dentry *dentry, char *buffer,
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size_t buffer_size)
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{
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return -EIO;
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}
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static const char *bad_inode_get_link(struct dentry *dentry,
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struct inode *inode,
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struct delayed_call *done)
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{
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return ERR_PTR(-EIO);
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}
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static struct posix_acl *bad_inode_get_acl(struct inode *inode, int type)
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{
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return ERR_PTR(-EIO);
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}
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static int bad_inode_fiemap(struct inode *inode,
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struct fiemap_extent_info *fieinfo, u64 start,
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u64 len)
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{
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return -EIO;
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}
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static int bad_inode_update_time(struct inode *inode, struct timespec64 *time,
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int flags)
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{
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return -EIO;
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}
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static int bad_inode_atomic_open(struct inode *inode, struct dentry *dentry,
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struct file *file, unsigned int open_flag,
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umode_t create_mode)
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{
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return -EIO;
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}
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static int bad_inode_tmpfile(struct user_namespace *mnt_userns,
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struct inode *inode, struct dentry *dentry,
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umode_t mode)
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{
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return -EIO;
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}
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static int bad_inode_set_acl(struct user_namespace *mnt_userns,
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struct inode *inode, struct posix_acl *acl,
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int type)
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{
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return -EIO;
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}
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static const struct inode_operations bad_inode_ops =
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{
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.create = bad_inode_create,
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.lookup = bad_inode_lookup,
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.link = bad_inode_link,
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.unlink = bad_inode_unlink,
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.symlink = bad_inode_symlink,
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.mkdir = bad_inode_mkdir,
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.rmdir = bad_inode_rmdir,
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.mknod = bad_inode_mknod,
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.rename = bad_inode_rename2,
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.readlink = bad_inode_readlink,
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.permission = bad_inode_permission,
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.getattr = bad_inode_getattr,
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.setattr = bad_inode_setattr,
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.listxattr = bad_inode_listxattr,
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.get_link = bad_inode_get_link,
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.get_acl = bad_inode_get_acl,
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.fiemap = bad_inode_fiemap,
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.update_time = bad_inode_update_time,
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.atomic_open = bad_inode_atomic_open,
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.tmpfile = bad_inode_tmpfile,
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.set_acl = bad_inode_set_acl,
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};
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/*
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* When a filesystem is unable to read an inode due to an I/O error in
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* its read_inode() function, it can call make_bad_inode() to return a
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* set of stubs which will return EIO errors as required.
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*
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* We only need to do limited initialisation: all other fields are
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* preinitialised to zero automatically.
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*/
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/**
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* make_bad_inode - mark an inode bad due to an I/O error
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* @inode: Inode to mark bad
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*
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* When an inode cannot be read due to a media or remote network
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* failure this function makes the inode "bad" and causes I/O operations
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* on it to fail from this point on.
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*/
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void make_bad_inode(struct inode *inode)
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{
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remove_inode_hash(inode);
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inode->i_mode = S_IFREG;
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inode->i_atime = inode->i_mtime = inode->i_ctime =
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current_time(inode);
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inode->i_op = &bad_inode_ops;
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inode->i_opflags &= ~IOP_XATTR;
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inode->i_fop = &bad_file_ops;
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}
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EXPORT_SYMBOL(make_bad_inode);
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/*
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* This tests whether an inode has been flagged as bad. The test uses
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* &bad_inode_ops to cover the case of invalidated inodes as well as
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* those created by make_bad_inode() above.
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*/
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/**
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* is_bad_inode - is an inode errored
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* @inode: inode to test
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*
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* Returns true if the inode in question has been marked as bad.
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*/
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bool is_bad_inode(struct inode *inode)
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{
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return (inode->i_op == &bad_inode_ops);
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}
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EXPORT_SYMBOL(is_bad_inode);
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/**
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* iget_failed - Mark an under-construction inode as dead and release it
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* @inode: The inode to discard
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*
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* Mark an under-construction inode as dead and release it.
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*/
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void iget_failed(struct inode *inode)
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{
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make_bad_inode(inode);
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unlock_new_inode(inode);
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iput(inode);
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}
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EXPORT_SYMBOL(iget_failed);
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