2018-11-04 01:19:03 -07:00
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/* Filesystem superblock creation and reconfiguration context.
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*
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* Copyright (C) 2018 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public Licence
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* as published by the Free Software Foundation; either version
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* 2 of the Licence, or (at your option) any later version.
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*/
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#ifndef _LINUX_FS_CONTEXT_H
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#define _LINUX_FS_CONTEXT_H
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/security.h>
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struct cred;
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struct dentry;
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struct file_operations;
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struct file_system_type;
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struct net;
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struct user_namespace;
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enum fs_context_purpose {
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FS_CONTEXT_FOR_MOUNT, /* New superblock for explicit mount */
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2018-11-04 07:28:36 -07:00
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FS_CONTEXT_FOR_RECONFIGURE, /* Superblock reconfiguration (remount) */
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2018-11-04 01:19:03 -07:00
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};
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/*
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* Filesystem context for holding the parameters used in the creation or
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* reconfiguration of a superblock.
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*
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* Superblock creation fills in ->root whereas reconfiguration begins with this
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* already set.
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*
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* See Documentation/filesystems/mounting.txt
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*/
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struct fs_context {
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struct file_system_type *fs_type;
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void *fs_private; /* The filesystem's context */
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struct dentry *root; /* The root and superblock */
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struct user_namespace *user_ns; /* The user namespace for this mount */
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struct net *net_ns; /* The network namespace for this mount */
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const struct cred *cred; /* The mounter's credentials */
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const char *source; /* The source name (eg. dev path) */
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const char *subtype; /* The subtype to set on the superblock */
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void *security; /* Linux S&M options */
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unsigned int sb_flags; /* Proposed superblock flags (SB_*) */
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unsigned int sb_flags_mask; /* Superblock flags that were changed */
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enum fs_context_purpose purpose:8;
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bool need_free:1; /* Need to call ops->free() */
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};
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/*
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* fs_context manipulation functions.
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*/
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extern struct fs_context *fs_context_for_mount(struct file_system_type *fs_type,
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unsigned int sb_flags);
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2018-11-04 07:28:36 -07:00
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extern struct fs_context *fs_context_for_reconfigure(struct dentry *dentry,
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unsigned int sb_flags,
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unsigned int sb_flags_mask);
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2018-11-04 01:19:03 -07:00
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extern int vfs_get_tree(struct fs_context *fc);
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extern void put_fs_context(struct fs_context *fc);
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#endif /* _LINUX_FS_CONTEXT_H */
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