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 */
25 int coda_fake_statfs;
26
27 /* print a fid */
coda_f2s(struct CodaFid * f)28 char * 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 */
coda_iscontrol(const char * name,size_t length)38 int coda_iscontrol(const char *name, size_t length)
39 {
40 return ((CODA_CONTROLLEN == length) &&
41 (strncmp(name, CODA_CONTROL, CODA_CONTROLLEN) == 0));
42 }
43
coda_flags_to_cflags(unsigned short flags)44 unsigned 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
coda_to_timespec64(struct coda_timespec ts)69 static 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
timespec64_to_coda(struct timespec64 ts64)79 static 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 */
coda_inode_type(struct coda_vattr * attr)90 umode_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
coda_vattr_to_iattr(struct inode * inode,struct coda_vattr * attr)105 void 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->i_atime = coda_to_timespec64(attr->va_atime);
127 if (attr->va_mtime.tv_sec != -1)
128 inode->i_mtime = coda_to_timespec64(attr->va_mtime);
129 if (attr->va_ctime.tv_sec != -1)
130 inode_set_ctime_to_ts(inode,
131 coda_to_timespec64(attr->va_ctime));
132 }
133
134
135 /*
136 * BSD sets attributes that need not be modified to -1.
137 * Linux uses the valid field to indicate what should be
138 * looked at. The BSD type field needs to be deduced from linux
139 * mode.
140 * So we have to do some translations here.
141 */
142
coda_iattr_to_vattr(struct iattr * iattr,struct coda_vattr * vattr)143 void coda_iattr_to_vattr(struct iattr *iattr, struct coda_vattr *vattr)
144 {
145 unsigned int valid;
146
147 /* clean out */
148 vattr->va_mode = -1;
149 vattr->va_uid = (vuid_t) -1;
150 vattr->va_gid = (vgid_t) -1;
151 vattr->va_size = (off_t) -1;
152 vattr->va_atime.tv_sec = (int64_t) -1;
153 vattr->va_atime.tv_nsec = (long) -1;
154 vattr->va_mtime.tv_sec = (int64_t) -1;
155 vattr->va_mtime.tv_nsec = (long) -1;
156 vattr->va_ctime.tv_sec = (int64_t) -1;
157 vattr->va_ctime.tv_nsec = (long) -1;
158 vattr->va_type = C_VNON;
159 vattr->va_fileid = -1;
160 vattr->va_gen = -1;
161 vattr->va_bytes = -1;
162 vattr->va_nlink = -1;
163 vattr->va_blocksize = -1;
164 vattr->va_rdev = -1;
165 vattr->va_flags = 0;
166
167 /* determine the type */
168 #if 0
169 mode = iattr->ia_mode;
170 if ( S_ISDIR(mode) ) {
171 vattr->va_type = C_VDIR;
172 } else if ( S_ISREG(mode) ) {
173 vattr->va_type = C_VREG;
174 } else if ( S_ISLNK(mode) ) {
175 vattr->va_type = C_VLNK;
176 } else {
177 /* don't do others */
178 vattr->va_type = C_VNON;
179 }
180 #endif
181
182 /* set those vattrs that need change */
183 valid = iattr->ia_valid;
184 if ( valid & ATTR_MODE ) {
185 vattr->va_mode = iattr->ia_mode;
186 }
187 if ( valid & ATTR_UID ) {
188 vattr->va_uid = (vuid_t) from_kuid(&init_user_ns, iattr->ia_uid);
189 }
190 if ( valid & ATTR_GID ) {
191 vattr->va_gid = (vgid_t) from_kgid(&init_user_ns, iattr->ia_gid);
192 }
193 if ( valid & ATTR_SIZE ) {
194 vattr->va_size = iattr->ia_size;
195 }
196 if ( valid & ATTR_ATIME ) {
197 vattr->va_atime = timespec64_to_coda(iattr->ia_atime);
198 }
199 if ( valid & ATTR_MTIME ) {
200 vattr->va_mtime = timespec64_to_coda(iattr->ia_mtime);
201 }
202 if ( valid & ATTR_CTIME ) {
203 vattr->va_ctime = timespec64_to_coda(iattr->ia_ctime);
204 }
205 }
206
207