1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Inode operations for Coda filesystem
4 * Original version: (C) 1996 P. Braam and M. Callahan
5 * Rewritten for Linux 2.1. (C) 1997 Carnegie Mellon University
6 *
7 * Carnegie Mellon encourages users to contribute improvements to
8 * the Coda project. Contact Peter Braam (coda@cs.cmu.edu).
9 */
10
11#include <linux/types.h>
12#include <linux/kernel.h>
13#include <linux/time.h>
14#include <linux/fs.h>
15#include <linux/stat.h>
16#include <linux/errno.h>
17#include <linux/uaccess.h>
18#include <linux/string.h>
19
20#include <linux/coda.h>
21#include "coda_psdev.h"
22#include "coda_linux.h"
23
24/* initialize the debugging variables */
25int coda_fake_statfs;
26
27/* print a fid */
28char * coda_f2s(struct CodaFid *f)
29{
30	static char s[60];
31
32 	sprintf(s, "(%08x.%08x.%08x.%08x)", f->opaque[0], f->opaque[1], f->opaque[2], f->opaque[3]);
33
34	return s;
35}
36
37/* recognize special .CONTROL name */
38int coda_iscontrol(const char *name, size_t length)
39{
40	return ((CODA_CONTROLLEN == length) &&
41                (strncmp(name, CODA_CONTROL, CODA_CONTROLLEN) == 0));
42}
43
44unsigned short coda_flags_to_cflags(unsigned short flags)
45{
46	unsigned short coda_flags = 0;
47
48	if ((flags & O_ACCMODE) == O_RDONLY)
49		coda_flags |= C_O_READ;
50
51	if ((flags & O_ACCMODE) == O_RDWR)
52		coda_flags |= C_O_READ | C_O_WRITE;
53
54	if ((flags & O_ACCMODE) == O_WRONLY)
55		coda_flags |= C_O_WRITE;
56
57	if (flags & O_TRUNC)
58		coda_flags |= C_O_TRUNC;
59
60	if (flags & O_CREAT)
61		coda_flags |= C_O_CREAT;
62
63	if (flags & O_EXCL)
64		coda_flags |= C_O_EXCL;
65
66	return coda_flags;
67}
68
69static struct timespec64 coda_to_timespec64(struct coda_timespec ts)
70{
71	struct timespec64 ts64 = {
72		.tv_sec = ts.tv_sec,
73		.tv_nsec = ts.tv_nsec,
74	};
75
76	return ts64;
77}
78
79static struct coda_timespec timespec64_to_coda(struct timespec64 ts64)
80{
81	struct coda_timespec ts = {
82		.tv_sec = ts64.tv_sec,
83		.tv_nsec = ts64.tv_nsec,
84	};
85
86	return ts;
87}
88
89/* utility functions below */
90umode_t coda_inode_type(struct coda_vattr *attr)
91{
92	switch (attr->va_type) {
93	case C_VREG:
94		return S_IFREG;
95	case C_VDIR:
96		return S_IFDIR;
97	case C_VLNK:
98		return S_IFLNK;
99	case C_VNON:
100	default:
101		return 0;
102	}
103}
104
105void coda_vattr_to_iattr(struct inode *inode, struct coda_vattr *attr)
106{
107	/* inode's i_flags, i_ino are set by iget
108	 * XXX: is this all we need ??
109	 */
110	umode_t inode_type = coda_inode_type(attr);
111	inode->i_mode |= inode_type;
112
113	if (attr->va_mode != (u_short) -1)
114	        inode->i_mode = attr->va_mode | inode_type;
115        if (attr->va_uid != -1)
116	        inode->i_uid = make_kuid(&init_user_ns, (uid_t) attr->va_uid);
117        if (attr->va_gid != -1)
118	        inode->i_gid = make_kgid(&init_user_ns, (gid_t) attr->va_gid);
119	if (attr->va_nlink != -1)
120		set_nlink(inode, attr->va_nlink);
121	if (attr->va_size != -1)
122	        inode->i_size = attr->va_size;
123	if (attr->va_size != -1)
124		inode->i_blocks = (attr->va_size + 511) >> 9;
125	if (attr->va_atime.tv_sec != -1)
126		inode_set_atime_to_ts(inode,
127				      coda_to_timespec64(attr->va_atime));
128	if (attr->va_mtime.tv_sec != -1)
129		inode_set_mtime_to_ts(inode,
130				      coda_to_timespec64(attr->va_mtime));
131        if (attr->va_ctime.tv_sec != -1)
132		inode_set_ctime_to_ts(inode,
133				      coda_to_timespec64(attr->va_ctime));
134}
135
136
137/*
138 * BSD sets attributes that need not be modified to -1.
139 * Linux uses the valid field to indicate what should be
140 * looked at.  The BSD type field needs to be deduced from linux
141 * mode.
142 * So we have to do some translations here.
143 */
144
145void coda_iattr_to_vattr(struct iattr *iattr, struct coda_vattr *vattr)
146{
147        unsigned int valid;
148
149        /* clean out */
150	vattr->va_mode = -1;
151        vattr->va_uid = (vuid_t) -1;
152        vattr->va_gid = (vgid_t) -1;
153        vattr->va_size = (off_t) -1;
154	vattr->va_atime.tv_sec = (int64_t) -1;
155	vattr->va_atime.tv_nsec = (long) -1;
156	vattr->va_mtime.tv_sec = (int64_t) -1;
157	vattr->va_mtime.tv_nsec = (long) -1;
158	vattr->va_ctime.tv_sec = (int64_t) -1;
159	vattr->va_ctime.tv_nsec = (long) -1;
160        vattr->va_type = C_VNON;
161	vattr->va_fileid = -1;
162	vattr->va_gen = -1;
163	vattr->va_bytes = -1;
164	vattr->va_nlink = -1;
165	vattr->va_blocksize = -1;
166	vattr->va_rdev = -1;
167        vattr->va_flags = 0;
168
169        /* determine the type */
170#if 0
171        mode = iattr->ia_mode;
172                if ( S_ISDIR(mode) ) {
173                vattr->va_type = C_VDIR;
174        } else if ( S_ISREG(mode) ) {
175                vattr->va_type = C_VREG;
176        } else if ( S_ISLNK(mode) ) {
177                vattr->va_type = C_VLNK;
178        } else {
179                /* don't do others */
180                vattr->va_type = C_VNON;
181        }
182#endif
183
184        /* set those vattrs that need change */
185        valid = iattr->ia_valid;
186        if ( valid & ATTR_MODE ) {
187                vattr->va_mode = iattr->ia_mode;
188	}
189        if ( valid & ATTR_UID ) {
190                vattr->va_uid = (vuid_t) from_kuid(&init_user_ns, iattr->ia_uid);
191	}
192        if ( valid & ATTR_GID ) {
193                vattr->va_gid = (vgid_t) from_kgid(&init_user_ns, iattr->ia_gid);
194	}
195        if ( valid & ATTR_SIZE ) {
196                vattr->va_size = iattr->ia_size;
197	}
198        if ( valid & ATTR_ATIME ) {
199		vattr->va_atime = timespec64_to_coda(iattr->ia_atime);
200	}
201        if ( valid & ATTR_MTIME ) {
202		vattr->va_mtime = timespec64_to_coda(iattr->ia_mtime);
203	}
204        if ( valid & ATTR_CTIME ) {
205		vattr->va_ctime = timespec64_to_coda(iattr->ia_ctime);
206	}
207}
208
209