tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * Copyright (c) 2024 Paulo Alcantara <pc@manguebit.com>
4 */
5
6#ifndef _CIFS_REPARSE_H
7#define _CIFS_REPARSE_H
8
9#include <linux/fs.h>
10#include <linux/stat.h>
11#include <linux/uidgid.h>
12#include "fs_context.h"
13#include "cifsglob.h"
14
15static inline dev_t reparse_nfs_mkdev(struct reparse_posix_data *buf)
16{
17 u64 v = le64_to_cpu(*(__le64 *)buf->DataBuffer);
18
19 return MKDEV(v >> 32, v & 0xffffffff);
20}
21
22static inline dev_t wsl_mkdev(void *ptr)
23{
24 u64 v = le64_to_cpu(*(__le64 *)ptr);
25
26 return MKDEV(v & 0xffffffff, v >> 32);
27}
28
29static inline kuid_t wsl_make_kuid(struct cifs_sb_info *cifs_sb,
30 void *ptr)
31{
32 u32 uid = le32_to_cpu(*(__le32 *)ptr);
33
34 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
35 return cifs_sb->ctx->linux_uid;
36 return make_kuid(current_user_ns(), uid);
37}
38
39static inline kgid_t wsl_make_kgid(struct cifs_sb_info *cifs_sb,
40 void *ptr)
41{
42 u32 gid = le32_to_cpu(*(__le32 *)ptr);
43
44 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
45 return cifs_sb->ctx->linux_gid;
46 return make_kgid(current_user_ns(), gid);
47}
48
49static inline u64 reparse_mode_nfs_type(mode_t mode)
50{
51 switch (mode & S_IFMT) {
52 case S_IFBLK: return NFS_SPECFILE_BLK;
53 case S_IFCHR: return NFS_SPECFILE_CHR;
54 case S_IFIFO: return NFS_SPECFILE_FIFO;
55 case S_IFSOCK: return NFS_SPECFILE_SOCK;
56 }
57 return 0;
58}
59
60static inline u32 reparse_mode_wsl_tag(mode_t mode)
61{
62 switch (mode & S_IFMT) {
63 case S_IFBLK: return IO_REPARSE_TAG_LX_BLK;
64 case S_IFCHR: return IO_REPARSE_TAG_LX_CHR;
65 case S_IFIFO: return IO_REPARSE_TAG_LX_FIFO;
66 case S_IFSOCK: return IO_REPARSE_TAG_AF_UNIX;
67 }
68 return 0;
69}
70
71/*
72 * Match a reparse point inode if reparse tag and ctime haven't changed.
73 *
74 * Windows Server updates ctime of reparse points when their data have changed.
75 * The server doesn't allow changing reparse tags from existing reparse points,
76 * though it's worth checking.
77 */
78static inline bool reparse_inode_match(struct inode *inode,
79 struct cifs_fattr *fattr)
80{
81 struct timespec64 ctime = inode_get_ctime(inode);
82
83 return (CIFS_I(inode)->cifsAttrs & ATTR_REPARSE) &&
84 CIFS_I(inode)->reparse_tag == fattr->cf_cifstag &&
85 timespec64_equal(&ctime, &fattr->cf_ctime);
86}
87
88static inline bool cifs_open_data_reparse(struct cifs_open_info_data *data)
89{
90 struct smb2_file_all_info *fi = &data->fi;
91 u32 attrs = le32_to_cpu(fi->Attributes);
92 bool ret;
93
94 ret = data->reparse_point || (attrs & ATTR_REPARSE);
95 if (ret)
96 attrs |= ATTR_REPARSE;
97 fi->Attributes = cpu_to_le32(attrs);
98 return ret;
99}
100
101bool cifs_reparse_point_to_fattr(struct cifs_sb_info *cifs_sb,
102 struct cifs_fattr *fattr,
103 struct cifs_open_info_data *data);
104int smb2_create_reparse_symlink(const unsigned int xid, struct inode *inode,
105 struct dentry *dentry, struct cifs_tcon *tcon,
106 const char *full_path, const char *symname);
107int smb2_mknod_reparse(unsigned int xid, struct inode *inode,
108 struct dentry *dentry, struct cifs_tcon *tcon,
109 const char *full_path, umode_t mode, dev_t dev);
110int smb2_parse_reparse_point(struct cifs_sb_info *cifs_sb, struct kvec *rsp_iov,
111 struct cifs_open_info_data *data);
112
113#endif /* _CIFS_REPARSE_H */