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9bc61ab1 DH |
1 | /* Filesystem superblock creation and reconfiguration context. |
2 | * | |
3 | * Copyright (C) 2018 Red Hat, Inc. All Rights Reserved. | |
4 | * Written by David Howells (dhowells@redhat.com) | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public Licence | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the Licence, or (at your option) any later version. | |
10 | */ | |
11 | ||
12 | #ifndef _LINUX_FS_CONTEXT_H | |
13 | #define _LINUX_FS_CONTEXT_H | |
14 | ||
15 | #include <linux/kernel.h> | |
16 | #include <linux/errno.h> | |
17 | #include <linux/security.h> | |
18 | ||
19 | struct cred; | |
20 | struct dentry; | |
21 | struct file_operations; | |
22 | struct file_system_type; | |
23 | struct net; | |
24 | struct user_namespace; | |
25 | ||
26 | enum fs_context_purpose { | |
27 | FS_CONTEXT_FOR_MOUNT, /* New superblock for explicit mount */ | |
28 | }; | |
29 | ||
30 | /* | |
31 | * Filesystem context for holding the parameters used in the creation or | |
32 | * reconfiguration of a superblock. | |
33 | * | |
34 | * Superblock creation fills in ->root whereas reconfiguration begins with this | |
35 | * already set. | |
36 | * | |
37 | * See Documentation/filesystems/mounting.txt | |
38 | */ | |
39 | struct fs_context { | |
40 | struct file_system_type *fs_type; | |
41 | void *fs_private; /* The filesystem's context */ | |
42 | struct dentry *root; /* The root and superblock */ | |
43 | struct user_namespace *user_ns; /* The user namespace for this mount */ | |
44 | struct net *net_ns; /* The network namespace for this mount */ | |
45 | const struct cred *cred; /* The mounter's credentials */ | |
46 | const char *source; /* The source name (eg. dev path) */ | |
47 | const char *subtype; /* The subtype to set on the superblock */ | |
48 | void *security; /* Linux S&M options */ | |
49 | unsigned int sb_flags; /* Proposed superblock flags (SB_*) */ | |
50 | unsigned int sb_flags_mask; /* Superblock flags that were changed */ | |
51 | enum fs_context_purpose purpose:8; | |
52 | bool need_free:1; /* Need to call ops->free() */ | |
53 | }; | |
54 | ||
55 | /* | |
56 | * fs_context manipulation functions. | |
57 | */ | |
58 | extern struct fs_context *fs_context_for_mount(struct file_system_type *fs_type, | |
59 | unsigned int sb_flags); | |
60 | ||
61 | extern int vfs_get_tree(struct fs_context *fc); | |
62 | extern void put_fs_context(struct fs_context *fc); | |
63 | ||
64 | #endif /* _LINUX_FS_CONTEXT_H */ |