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![Christoph Hellwig](/assets/img/avatar_default.png)
Enable idmapped mounts for xfs. This basically just means passing down the user_namespace argument from the VFS methods down to where it is passed to the relevant helpers. Note that full-filesystem bulkstat is not supported from inside idmapped mounts as it is an administrative operation that acts on the whole file system. The limitation is not applied to the bulkstat single operation that just operates on a single inode. Link: https://lore.kernel.org/r/20210121131959.646623-40-christian.brauner@ubuntu.com Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
288 lines
6.2 KiB
C
288 lines
6.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2008, Christoph Hellwig
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* All Rights Reserved.
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*/
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#include "xfs.h"
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#include "xfs_shared.h"
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#include "xfs_format.h"
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#include "xfs_log_format.h"
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#include "xfs_trans_resv.h"
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#include "xfs_mount.h"
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#include "xfs_inode.h"
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#include "xfs_attr.h"
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#include "xfs_trace.h"
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#include "xfs_error.h"
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#include "xfs_acl.h"
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#include "xfs_da_format.h"
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#include "xfs_da_btree.h"
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#include "xfs_trans.h"
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#include <linux/posix_acl_xattr.h>
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/*
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* Locking scheme:
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* - all ACL updates are protected by inode->i_mutex, which is taken before
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* calling into this file.
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*/
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STATIC struct posix_acl *
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xfs_acl_from_disk(
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struct xfs_mount *mp,
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const struct xfs_acl *aclp,
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int len,
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int max_entries)
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{
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struct posix_acl_entry *acl_e;
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struct posix_acl *acl;
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const struct xfs_acl_entry *ace;
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unsigned int count, i;
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if (len < sizeof(*aclp)) {
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XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp, aclp,
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len);
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return ERR_PTR(-EFSCORRUPTED);
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}
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count = be32_to_cpu(aclp->acl_cnt);
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if (count > max_entries || XFS_ACL_SIZE(count) != len) {
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XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp, aclp,
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len);
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return ERR_PTR(-EFSCORRUPTED);
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}
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acl = posix_acl_alloc(count, GFP_KERNEL);
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if (!acl)
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return ERR_PTR(-ENOMEM);
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for (i = 0; i < count; i++) {
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acl_e = &acl->a_entries[i];
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ace = &aclp->acl_entry[i];
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/*
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* The tag is 32 bits on disk and 16 bits in core.
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*
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* Because every access to it goes through the core
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* format first this is not a problem.
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*/
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acl_e->e_tag = be32_to_cpu(ace->ae_tag);
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acl_e->e_perm = be16_to_cpu(ace->ae_perm);
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switch (acl_e->e_tag) {
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case ACL_USER:
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acl_e->e_uid = make_kuid(&init_user_ns,
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be32_to_cpu(ace->ae_id));
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break;
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case ACL_GROUP:
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acl_e->e_gid = make_kgid(&init_user_ns,
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be32_to_cpu(ace->ae_id));
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break;
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case ACL_USER_OBJ:
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case ACL_GROUP_OBJ:
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case ACL_MASK:
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case ACL_OTHER:
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break;
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default:
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goto fail;
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}
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}
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return acl;
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fail:
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posix_acl_release(acl);
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return ERR_PTR(-EINVAL);
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}
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STATIC void
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xfs_acl_to_disk(struct xfs_acl *aclp, const struct posix_acl *acl)
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{
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const struct posix_acl_entry *acl_e;
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struct xfs_acl_entry *ace;
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int i;
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aclp->acl_cnt = cpu_to_be32(acl->a_count);
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for (i = 0; i < acl->a_count; i++) {
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ace = &aclp->acl_entry[i];
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acl_e = &acl->a_entries[i];
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ace->ae_tag = cpu_to_be32(acl_e->e_tag);
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switch (acl_e->e_tag) {
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case ACL_USER:
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ace->ae_id = cpu_to_be32(
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from_kuid(&init_user_ns, acl_e->e_uid));
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break;
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case ACL_GROUP:
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ace->ae_id = cpu_to_be32(
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from_kgid(&init_user_ns, acl_e->e_gid));
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break;
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default:
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ace->ae_id = cpu_to_be32(ACL_UNDEFINED_ID);
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break;
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}
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ace->ae_perm = cpu_to_be16(acl_e->e_perm);
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}
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}
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struct posix_acl *
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xfs_get_acl(struct inode *inode, int type)
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{
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struct xfs_inode *ip = XFS_I(inode);
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struct xfs_mount *mp = ip->i_mount;
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struct posix_acl *acl = NULL;
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struct xfs_da_args args = {
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.dp = ip,
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.attr_filter = XFS_ATTR_ROOT,
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.valuelen = XFS_ACL_MAX_SIZE(mp),
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};
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int error;
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trace_xfs_get_acl(ip);
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switch (type) {
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case ACL_TYPE_ACCESS:
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args.name = SGI_ACL_FILE;
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break;
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case ACL_TYPE_DEFAULT:
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args.name = SGI_ACL_DEFAULT;
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break;
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default:
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BUG();
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}
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args.namelen = strlen(args.name);
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/*
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* If the attribute doesn't exist make sure we have a negative cache
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* entry, for any other error assume it is transient.
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*/
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error = xfs_attr_get(&args);
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if (!error) {
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acl = xfs_acl_from_disk(mp, args.value, args.valuelen,
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XFS_ACL_MAX_ENTRIES(mp));
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} else if (error != -ENOATTR) {
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acl = ERR_PTR(error);
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}
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kmem_free(args.value);
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return acl;
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}
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int
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__xfs_set_acl(struct inode *inode, struct posix_acl *acl, int type)
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{
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struct xfs_inode *ip = XFS_I(inode);
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struct xfs_da_args args = {
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.dp = ip,
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.attr_filter = XFS_ATTR_ROOT,
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};
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int error;
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switch (type) {
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case ACL_TYPE_ACCESS:
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args.name = SGI_ACL_FILE;
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break;
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case ACL_TYPE_DEFAULT:
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if (!S_ISDIR(inode->i_mode))
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return acl ? -EACCES : 0;
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args.name = SGI_ACL_DEFAULT;
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break;
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default:
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return -EINVAL;
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}
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args.namelen = strlen(args.name);
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if (acl) {
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args.valuelen = XFS_ACL_SIZE(acl->a_count);
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args.value = kvzalloc(args.valuelen, GFP_KERNEL);
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if (!args.value)
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return -ENOMEM;
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xfs_acl_to_disk(args.value, acl);
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}
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error = xfs_attr_set(&args);
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kmem_free(args.value);
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/*
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* If the attribute didn't exist to start with that's fine.
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*/
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if (!acl && error == -ENOATTR)
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error = 0;
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if (!error)
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set_cached_acl(inode, type, acl);
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return error;
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}
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static int
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xfs_acl_set_mode(
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struct inode *inode,
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umode_t mode)
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{
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struct xfs_inode *ip = XFS_I(inode);
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struct xfs_mount *mp = ip->i_mount;
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struct xfs_trans *tp;
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int error;
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error = xfs_trans_alloc(mp, &M_RES(mp)->tr_ichange, 0, 0, 0, &tp);
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if (error)
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return error;
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xfs_ilock(ip, XFS_ILOCK_EXCL);
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xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
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inode->i_mode = mode;
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inode->i_ctime = current_time(inode);
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xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
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if (mp->m_flags & XFS_MOUNT_WSYNC)
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xfs_trans_set_sync(tp);
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return xfs_trans_commit(tp);
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}
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int
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xfs_set_acl(struct user_namespace *mnt_userns, struct inode *inode,
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struct posix_acl *acl, int type)
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{
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umode_t mode;
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bool set_mode = false;
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int error = 0;
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if (!acl)
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goto set_acl;
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error = -E2BIG;
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if (acl->a_count > XFS_ACL_MAX_ENTRIES(XFS_M(inode->i_sb)))
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return error;
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if (type == ACL_TYPE_ACCESS) {
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error = posix_acl_update_mode(mnt_userns, inode, &mode, &acl);
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if (error)
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return error;
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set_mode = true;
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}
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set_acl:
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/*
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* We set the mode after successfully updating the ACL xattr because the
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* xattr update can fail at ENOSPC and we don't want to change the mode
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* if the ACL update hasn't been applied.
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*/
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error = __xfs_set_acl(inode, acl, type);
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if (!error && set_mode && mode != inode->i_mode)
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error = xfs_acl_set_mode(inode, mode);
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return error;
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}
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/*
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* Invalidate any cached ACLs if the user has bypassed the ACL interface.
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* We don't validate the content whatsoever so it is caller responsibility to
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* provide data in valid format and ensure i_mode is consistent.
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*/
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void
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xfs_forget_acl(
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struct inode *inode,
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const char *name)
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{
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if (!strcmp(name, SGI_ACL_FILE))
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forget_cached_acl(inode, ACL_TYPE_ACCESS);
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else if (!strcmp(name, SGI_ACL_DEFAULT))
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forget_cached_acl(inode, ACL_TYPE_DEFAULT);
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}
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