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549c729771
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>
59 lines
1.3 KiB
C
59 lines
1.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* linux/fs/sysv/file.c
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*
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* minix/file.c
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* Copyright (C) 1991, 1992 Linus Torvalds
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*
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* coh/file.c
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* Copyright (C) 1993 Pascal Haible, Bruno Haible
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*
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* sysv/file.c
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* Copyright (C) 1993 Bruno Haible
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*
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* SystemV/Coherent regular file handling primitives
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*/
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#include "sysv.h"
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/*
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* We have mostly NULLs here: the current defaults are OK for
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* the coh filesystem.
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*/
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const struct file_operations sysv_file_operations = {
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.llseek = generic_file_llseek,
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.read_iter = generic_file_read_iter,
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.write_iter = generic_file_write_iter,
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.mmap = generic_file_mmap,
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.fsync = generic_file_fsync,
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.splice_read = generic_file_splice_read,
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};
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static int sysv_setattr(struct user_namespace *mnt_userns,
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struct dentry *dentry, struct iattr *attr)
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{
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struct inode *inode = d_inode(dentry);
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int error;
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error = setattr_prepare(&init_user_ns, dentry, attr);
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if (error)
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return error;
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if ((attr->ia_valid & ATTR_SIZE) &&
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attr->ia_size != i_size_read(inode)) {
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error = inode_newsize_ok(inode, attr->ia_size);
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if (error)
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return error;
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truncate_setsize(inode, attr->ia_size);
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sysv_truncate(inode);
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}
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setattr_copy(&init_user_ns, inode, attr);
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mark_inode_dirty(inode);
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return 0;
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}
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const struct inode_operations sysv_file_inode_operations = {
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.setattr = sysv_setattr,
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.getattr = sysv_getattr,
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};
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