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 */ |
28 | char * coda_f2s(struct CodaFid *f) |
29 | { |
30 | static char s[60]; |
31 | |
32 | sprintf(buf: s, fmt: "(%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 */ |
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 | |
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 | |
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 | |
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 */ |
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 | |
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(from: &init_user_ns, uid: (uid_t) attr->va_uid); |
117 | if (attr->va_gid != -1) |
118 | inode->i_gid = make_kgid(from: &init_user_ns, gid: (gid_t) attr->va_gid); |
119 | if (attr->va_nlink != -1) |
120 | set_nlink(inode, nlink: 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 | ts: coda_to_timespec64(ts: attr->va_atime)); |
128 | if (attr->va_mtime.tv_sec != -1) |
129 | inode_set_mtime_to_ts(inode, |
130 | ts: coda_to_timespec64(ts: attr->va_mtime)); |
131 | if (attr->va_ctime.tv_sec != -1) |
132 | inode_set_ctime_to_ts(inode, |
133 | ts: coda_to_timespec64(ts: 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 | |
145 | void 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(to: &init_user_ns, uid: iattr->ia_uid); |
191 | } |
192 | if ( valid & ATTR_GID ) { |
193 | vattr->va_gid = (vgid_t) from_kgid(to: &init_user_ns, gid: 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(ts64: iattr->ia_atime); |
200 | } |
201 | if ( valid & ATTR_MTIME ) { |
202 | vattr->va_mtime = timespec64_to_coda(ts64: iattr->ia_mtime); |
203 | } |
204 | if ( valid & ATTR_CTIME ) { |
205 | vattr->va_ctime = timespec64_to_coda(ts64: iattr->ia_ctime); |
206 | } |
207 | } |
208 | |
209 | |