1 // SPDX-License-Identifier: GPL-2.0
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
7 * Carnegie Mellon encourages users to contribute improvements to
8 * the Coda project. Contact Peter Braam (coda@cs.cmu.edu).
11 #include <linux/types.h>
12 #include <linux/kernel.h>
13 #include <linux/time.h>
15 #include <linux/stat.h>
16 #include <linux/errno.h>
17 #include <linux/uaccess.h>
18 #include <linux/string.h>
20 #include <linux/coda.h>
21 #include <linux/coda_psdev.h>
22 #include "coda_linux.h"
24 /* initialize the debugging variables */
28 char * coda_f2s(struct CodaFid *f)
32 sprintf(s, "(%08x.%08x.%08x.%08x)", f->opaque[0], f->opaque[1], f->opaque[2], f->opaque[3]);
37 /* recognize special .CONTROL name */
38 int coda_iscontrol(const char *name, size_t length)
40 return ((CODA_CONTROLLEN == length) &&
41 (strncmp(name, CODA_CONTROL, CODA_CONTROLLEN) == 0));
44 unsigned short coda_flags_to_cflags(unsigned short flags)
46 unsigned short coda_flags = 0;
48 if ((flags & O_ACCMODE) == O_RDONLY)
49 coda_flags |= C_O_READ;
51 if ((flags & O_ACCMODE) == O_RDWR)
52 coda_flags |= C_O_READ | C_O_WRITE;
54 if ((flags & O_ACCMODE) == O_WRONLY)
55 coda_flags |= C_O_WRITE;
58 coda_flags |= C_O_TRUNC;
61 coda_flags |= C_O_CREAT;
64 coda_flags |= C_O_EXCL;
69 static struct timespec64 coda_to_timespec64(struct vtimespec ts)
72 * We interpret incoming timestamps as 'signed' to match traditional
73 * usage and support pre-1970 timestamps, but this breaks in y2038
76 struct timespec64 ts64 = {
78 .tv_nsec = ts.tv_nsec,
84 static struct vtimespec timespec64_to_coda(struct timespec64 ts64)
86 /* clamp the timestamps to the maximum range rather than wrapping */
87 struct vtimespec ts = {
88 .tv_sec = lower_32_bits(clamp_t(time64_t, ts64.tv_sec,
90 .tv_nsec = ts64.tv_nsec,
96 /* utility functions below */
97 void coda_vattr_to_iattr(struct inode *inode, struct coda_vattr *attr)
100 /* inode's i_flags, i_ino are set by iget
101 XXX: is this all we need ??
103 switch (attr->va_type) {
108 inode_type = S_IFREG;
111 inode_type = S_IFDIR;
114 inode_type = S_IFLNK;
119 inode->i_mode |= inode_type;
121 if (attr->va_mode != (u_short) -1)
122 inode->i_mode = attr->va_mode | inode_type;
123 if (attr->va_uid != -1)
124 inode->i_uid = make_kuid(&init_user_ns, (uid_t) attr->va_uid);
125 if (attr->va_gid != -1)
126 inode->i_gid = make_kgid(&init_user_ns, (gid_t) attr->va_gid);
127 if (attr->va_nlink != -1)
128 set_nlink(inode, attr->va_nlink);
129 if (attr->va_size != -1)
130 inode->i_size = attr->va_size;
131 if (attr->va_size != -1)
132 inode->i_blocks = (attr->va_size + 511) >> 9;
133 if (attr->va_atime.tv_sec != -1)
134 inode->i_atime = coda_to_timespec64(attr->va_atime);
135 if (attr->va_mtime.tv_sec != -1)
136 inode->i_mtime = coda_to_timespec64(attr->va_mtime);
137 if (attr->va_ctime.tv_sec != -1)
138 inode->i_ctime = coda_to_timespec64(attr->va_ctime);
143 * BSD sets attributes that need not be modified to -1.
144 * Linux uses the valid field to indicate what should be
145 * looked at. The BSD type field needs to be deduced from linux
147 * So we have to do some translations here.
150 void coda_iattr_to_vattr(struct iattr *iattr, struct coda_vattr *vattr)
156 vattr->va_uid = (vuid_t) -1;
157 vattr->va_gid = (vgid_t) -1;
158 vattr->va_size = (off_t) -1;
159 vattr->va_atime.tv_sec = (long) -1;
160 vattr->va_atime.tv_nsec = (long) -1;
161 vattr->va_mtime.tv_sec = (long) -1;
162 vattr->va_mtime.tv_nsec = (long) -1;
163 vattr->va_ctime.tv_sec = (long) -1;
164 vattr->va_ctime.tv_nsec = (long) -1;
165 vattr->va_type = C_VNON;
166 vattr->va_fileid = -1;
168 vattr->va_bytes = -1;
169 vattr->va_nlink = -1;
170 vattr->va_blocksize = -1;
174 /* determine the type */
176 mode = iattr->ia_mode;
177 if ( S_ISDIR(mode) ) {
178 vattr->va_type = C_VDIR;
179 } else if ( S_ISREG(mode) ) {
180 vattr->va_type = C_VREG;
181 } else if ( S_ISLNK(mode) ) {
182 vattr->va_type = C_VLNK;
184 /* don't do others */
185 vattr->va_type = C_VNON;
189 /* set those vattrs that need change */
190 valid = iattr->ia_valid;
191 if ( valid & ATTR_MODE ) {
192 vattr->va_mode = iattr->ia_mode;
194 if ( valid & ATTR_UID ) {
195 vattr->va_uid = (vuid_t) from_kuid(&init_user_ns, iattr->ia_uid);
197 if ( valid & ATTR_GID ) {
198 vattr->va_gid = (vgid_t) from_kgid(&init_user_ns, iattr->ia_gid);
200 if ( valid & ATTR_SIZE ) {
201 vattr->va_size = iattr->ia_size;
203 if ( valid & ATTR_ATIME ) {
204 vattr->va_atime = timespec64_to_coda(iattr->ia_atime);
206 if ( valid & ATTR_MTIME ) {
207 vattr->va_mtime = timespec64_to_coda(iattr->ia_mtime);
209 if ( valid & ATTR_CTIME ) {
210 vattr->va_ctime = timespec64_to_coda(iattr->ia_ctime);