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->i_ctime = coda_to_timespec64(attr->va_ctime);
131 }
132
133
134 /*
135 * BSD sets attributes that need not be modified to -1.
136 * Linux uses the valid field to indicate what should be
137 * looked at. The BSD type field needs to be deduced from linux
138 * mode.
139 * So we have to do some translations here.
140 */
141
coda_iattr_to_vattr(struct iattr * iattr,struct coda_vattr * vattr)142 void coda_iattr_to_vattr(struct iattr *iattr, struct coda_vattr *vattr)
143 {
144 unsigned int valid;
145
146 /* clean out */
147 vattr->va_mode = -1;
148 vattr->va_uid = (vuid_t) -1;
149 vattr->va_gid = (vgid_t) -1;
150 vattr->va_size = (off_t) -1;
151 vattr->va_atime.tv_sec = (int64_t) -1;
152 vattr->va_atime.tv_nsec = (long) -1;
153 vattr->va_mtime.tv_sec = (int64_t) -1;
154 vattr->va_mtime.tv_nsec = (long) -1;
155 vattr->va_ctime.tv_sec = (int64_t) -1;
156 vattr->va_ctime.tv_nsec = (long) -1;
157 vattr->va_type = C_VNON;
158 vattr->va_fileid = -1;
159 vattr->va_gen = -1;
160 vattr->va_bytes = -1;
161 vattr->va_nlink = -1;
162 vattr->va_blocksize = -1;
163 vattr->va_rdev = -1;
164 vattr->va_flags = 0;
165
166 /* determine the type */
167 #if 0
168 mode = iattr->ia_mode;
169 if ( S_ISDIR(mode) ) {
170 vattr->va_type = C_VDIR;
171 } else if ( S_ISREG(mode) ) {
172 vattr->va_type = C_VREG;
173 } else if ( S_ISLNK(mode) ) {
174 vattr->va_type = C_VLNK;
175 } else {
176 /* don't do others */
177 vattr->va_type = C_VNON;
178 }
179 #endif
180
181 /* set those vattrs that need change */
182 valid = iattr->ia_valid;
183 if ( valid & ATTR_MODE ) {
184 vattr->va_mode = iattr->ia_mode;
185 }
186 if ( valid & ATTR_UID ) {
187 vattr->va_uid = (vuid_t) from_kuid(&init_user_ns, iattr->ia_uid);
188 }
189 if ( valid & ATTR_GID ) {
190 vattr->va_gid = (vgid_t) from_kgid(&init_user_ns, iattr->ia_gid);
191 }
192 if ( valid & ATTR_SIZE ) {
193 vattr->va_size = iattr->ia_size;
194 }
195 if ( valid & ATTR_ATIME ) {
196 vattr->va_atime = timespec64_to_coda(iattr->ia_atime);
197 }
198 if ( valid & ATTR_MTIME ) {
199 vattr->va_mtime = timespec64_to_coda(iattr->ia_mtime);
200 }
201 if ( valid & ATTR_CTIME ) {
202 vattr->va_ctime = timespec64_to_coda(iattr->ia_ctime);
203 }
204 }
205
206