Greg Kroah-Hartman | b244131 | 2017-11-01 15:07:57 +0100 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | /* |
| 3 | * Mostly platform independent upcall operations to Venus: |
| 4 | * -- upcalls |
| 5 | * -- upcall routines |
| 6 | * |
| 7 | * Linux 2.0 version |
| 8 | * Copyright (C) 1996 Peter J. Braam <braam@maths.ox.ac.uk>, |
| 9 | * Michael Callahan <callahan@maths.ox.ac.uk> |
| 10 | * |
| 11 | * Redone for Linux 2.1 |
| 12 | * Copyright (C) 1997 Carnegie Mellon University |
| 13 | * |
| 14 | * Carnegie Mellon University encourages users of this code to contribute |
| 15 | * improvements to the Coda project. Contact Peter Braam <coda@cs.cmu.edu>. |
| 16 | */ |
| 17 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | #include <linux/signal.h> |
Ingo Molnar | 3f07c01 | 2017-02-08 18:51:30 +0100 | [diff] [blame] | 19 | #include <linux/sched/signal.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | #include <linux/types.h> |
| 21 | #include <linux/kernel.h> |
| 22 | #include <linux/mm.h> |
| 23 | #include <linux/time.h> |
| 24 | #include <linux/fs.h> |
| 25 | #include <linux/file.h> |
| 26 | #include <linux/stat.h> |
| 27 | #include <linux/errno.h> |
| 28 | #include <linux/string.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 29 | #include <linux/slab.h> |
Yoshihisa Abe | da47c19 | 2010-10-25 02:03:46 -0400 | [diff] [blame] | 30 | #include <linux/mutex.h> |
Fabian Frederick | 834b46c | 2014-08-08 14:20:33 -0700 | [diff] [blame] | 31 | #include <linux/uaccess.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | #include <linux/vmalloc.h> |
| 33 | #include <linux/vfs.h> |
| 34 | |
| 35 | #include <linux/coda.h> |
David Howells | 8fc8b9d | 2019-07-16 16:28:47 -0700 | [diff] [blame] | 36 | #include "coda_psdev.h" |
Al Viro | 31a203d | 2011-01-12 16:36:09 -0500 | [diff] [blame] | 37 | #include "coda_linux.h" |
| 38 | #include "coda_cache.h" |
Jan Harkes | 3cf01f2 | 2007-07-19 01:48:51 -0700 | [diff] [blame] | 39 | |
| 40 | #include "coda_int.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | |
Jan Harkes | a1b0aa8 | 2007-07-19 01:48:50 -0700 | [diff] [blame] | 42 | static int coda_upcall(struct venus_comm *vc, int inSize, int *outSize, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | union inputArgs *buffer); |
| 44 | |
| 45 | static void *alloc_upcall(int opcode, int size) |
| 46 | { |
| 47 | union inputArgs *inp; |
| 48 | |
Dan Carpenter | 4dc4819 | 2019-07-16 16:28:38 -0700 | [diff] [blame] | 49 | inp = kvzalloc(size, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | if (!inp) |
| 51 | return ERR_PTR(-ENOMEM); |
| 52 | |
| 53 | inp->ih.opcode = opcode; |
Eric W. Biederman | 9fd973e | 2013-01-30 18:50:54 -0800 | [diff] [blame] | 54 | inp->ih.pid = task_pid_nr_ns(current, &init_pid_ns); |
| 55 | inp->ih.pgid = task_pgrp_nr_ns(current, &init_pid_ns); |
Eric W. Biederman | d83f590 | 2013-01-30 19:21:14 -0800 | [diff] [blame] | 56 | inp->ih.uid = from_kuid(&init_user_ns, current_fsuid()); |
Adrian Bunk | de0ca06 | 2008-07-25 01:46:34 -0700 | [diff] [blame] | 57 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | return (void*)inp; |
| 59 | } |
| 60 | |
| 61 | #define UPARG(op)\ |
| 62 | do {\ |
| 63 | inp = (union inputArgs *)alloc_upcall(op, insize); \ |
| 64 | if (IS_ERR(inp)) { return PTR_ERR(inp); }\ |
| 65 | outp = (union outputArgs *)(inp); \ |
| 66 | outsize = insize; \ |
| 67 | } while (0) |
| 68 | |
| 69 | #define INSIZE(tag) sizeof(struct coda_ ## tag ## _in) |
| 70 | #define OUTSIZE(tag) sizeof(struct coda_ ## tag ## _out) |
| 71 | #define SIZE(tag) max_t(unsigned int, INSIZE(tag), OUTSIZE(tag)) |
| 72 | |
| 73 | |
| 74 | /* the upcalls */ |
| 75 | int venus_rootfid(struct super_block *sb, struct CodaFid *fidp) |
| 76 | { |
| 77 | union inputArgs *inp; |
| 78 | union outputArgs *outp; |
| 79 | int insize, outsize, error; |
| 80 | |
| 81 | insize = SIZE(root); |
| 82 | UPARG(CODA_ROOT); |
| 83 | |
Jan Harkes | a1b0aa8 | 2007-07-19 01:48:50 -0700 | [diff] [blame] | 84 | error = coda_upcall(coda_vcp(sb), insize, &outsize, inp); |
Jan Harkes | 970648e | 2007-07-19 01:48:48 -0700 | [diff] [blame] | 85 | if (!error) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | *fidp = outp->coda_root.VFid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | |
Dan Carpenter | 936dae4 | 2019-07-16 16:28:41 -0700 | [diff] [blame] | 88 | kvfree(inp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | return error; |
| 90 | } |
| 91 | |
| 92 | int venus_getattr(struct super_block *sb, struct CodaFid *fid, |
| 93 | struct coda_vattr *attr) |
| 94 | { |
| 95 | union inputArgs *inp; |
| 96 | union outputArgs *outp; |
| 97 | int insize, outsize, error; |
| 98 | |
| 99 | insize = SIZE(getattr); |
| 100 | UPARG(CODA_GETATTR); |
| 101 | inp->coda_getattr.VFid = *fid; |
| 102 | |
Jan Harkes | a1b0aa8 | 2007-07-19 01:48:50 -0700 | [diff] [blame] | 103 | error = coda_upcall(coda_vcp(sb), insize, &outsize, inp); |
Jan Harkes | 970648e | 2007-07-19 01:48:48 -0700 | [diff] [blame] | 104 | if (!error) |
| 105 | *attr = outp->coda_getattr.attr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | |
Dan Carpenter | 936dae4 | 2019-07-16 16:28:41 -0700 | [diff] [blame] | 107 | kvfree(inp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | return error; |
| 109 | } |
| 110 | |
| 111 | int venus_setattr(struct super_block *sb, struct CodaFid *fid, |
| 112 | struct coda_vattr *vattr) |
| 113 | { |
| 114 | union inputArgs *inp; |
| 115 | union outputArgs *outp; |
| 116 | int insize, outsize, error; |
| 117 | |
| 118 | insize = SIZE(setattr); |
| 119 | UPARG(CODA_SETATTR); |
| 120 | |
| 121 | inp->coda_setattr.VFid = *fid; |
| 122 | inp->coda_setattr.attr = *vattr; |
| 123 | |
Jan Harkes | a1b0aa8 | 2007-07-19 01:48:50 -0700 | [diff] [blame] | 124 | error = coda_upcall(coda_vcp(sb), insize, &outsize, inp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 125 | |
Dan Carpenter | 936dae4 | 2019-07-16 16:28:41 -0700 | [diff] [blame] | 126 | kvfree(inp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | return error; |
| 128 | } |
| 129 | |
| 130 | int venus_lookup(struct super_block *sb, struct CodaFid *fid, |
| 131 | const char *name, int length, int * type, |
| 132 | struct CodaFid *resfid) |
| 133 | { |
| 134 | union inputArgs *inp; |
| 135 | union outputArgs *outp; |
| 136 | int insize, outsize, error; |
| 137 | int offset; |
| 138 | |
| 139 | offset = INSIZE(lookup); |
| 140 | insize = max_t(unsigned int, offset + length +1, OUTSIZE(lookup)); |
| 141 | UPARG(CODA_LOOKUP); |
| 142 | |
| 143 | inp->coda_lookup.VFid = *fid; |
| 144 | inp->coda_lookup.name = offset; |
| 145 | inp->coda_lookup.flags = CLU_CASE_SENSITIVE; |
| 146 | /* send Venus a null terminated string */ |
| 147 | memcpy((char *)(inp) + offset, name, length); |
| 148 | *((char *)inp + offset + length) = '\0'; |
| 149 | |
Jan Harkes | a1b0aa8 | 2007-07-19 01:48:50 -0700 | [diff] [blame] | 150 | error = coda_upcall(coda_vcp(sb), insize, &outsize, inp); |
Jan Harkes | 970648e | 2007-07-19 01:48:48 -0700 | [diff] [blame] | 151 | if (!error) { |
| 152 | *resfid = outp->coda_lookup.VFid; |
| 153 | *type = outp->coda_lookup.vtype; |
| 154 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | |
Dan Carpenter | 936dae4 | 2019-07-16 16:28:41 -0700 | [diff] [blame] | 156 | kvfree(inp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 157 | return error; |
| 158 | } |
| 159 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | int venus_close(struct super_block *sb, struct CodaFid *fid, int flags, |
Eric W. Biederman | d83f590 | 2013-01-30 19:21:14 -0800 | [diff] [blame] | 161 | kuid_t uid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | { |
| 163 | union inputArgs *inp; |
| 164 | union outputArgs *outp; |
| 165 | int insize, outsize, error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | |
| 167 | insize = SIZE(release); |
| 168 | UPARG(CODA_CLOSE); |
| 169 | |
Eric W. Biederman | d83f590 | 2013-01-30 19:21:14 -0800 | [diff] [blame] | 170 | inp->ih.uid = from_kuid(&init_user_ns, uid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | inp->coda_close.VFid = *fid; |
| 172 | inp->coda_close.flags = flags; |
| 173 | |
Jan Harkes | a1b0aa8 | 2007-07-19 01:48:50 -0700 | [diff] [blame] | 174 | error = coda_upcall(coda_vcp(sb), insize, &outsize, inp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 175 | |
Dan Carpenter | 936dae4 | 2019-07-16 16:28:41 -0700 | [diff] [blame] | 176 | kvfree(inp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 177 | return error; |
| 178 | } |
| 179 | |
| 180 | int venus_open(struct super_block *sb, struct CodaFid *fid, |
| 181 | int flags, struct file **fh) |
| 182 | { |
| 183 | union inputArgs *inp; |
| 184 | union outputArgs *outp; |
| 185 | int insize, outsize, error; |
| 186 | |
| 187 | insize = SIZE(open_by_fd); |
| 188 | UPARG(CODA_OPEN_BY_FD); |
| 189 | |
Jan Harkes | 38c2e43 | 2007-07-19 01:48:41 -0700 | [diff] [blame] | 190 | inp->coda_open_by_fd.VFid = *fid; |
| 191 | inp->coda_open_by_fd.flags = flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | |
Jan Harkes | a1b0aa8 | 2007-07-19 01:48:50 -0700 | [diff] [blame] | 193 | error = coda_upcall(coda_vcp(sb), insize, &outsize, inp); |
Jan Harkes | 38c2e43 | 2007-07-19 01:48:41 -0700 | [diff] [blame] | 194 | if (!error) |
| 195 | *fh = outp->coda_open_by_fd.fh; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 196 | |
Dan Carpenter | 936dae4 | 2019-07-16 16:28:41 -0700 | [diff] [blame] | 197 | kvfree(inp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 198 | return error; |
| 199 | } |
| 200 | |
| 201 | int venus_mkdir(struct super_block *sb, struct CodaFid *dirfid, |
| 202 | const char *name, int length, |
| 203 | struct CodaFid *newfid, struct coda_vattr *attrs) |
| 204 | { |
| 205 | union inputArgs *inp; |
| 206 | union outputArgs *outp; |
| 207 | int insize, outsize, error; |
| 208 | int offset; |
| 209 | |
| 210 | offset = INSIZE(mkdir); |
| 211 | insize = max_t(unsigned int, offset + length + 1, OUTSIZE(mkdir)); |
| 212 | UPARG(CODA_MKDIR); |
| 213 | |
| 214 | inp->coda_mkdir.VFid = *dirfid; |
| 215 | inp->coda_mkdir.attr = *attrs; |
| 216 | inp->coda_mkdir.name = offset; |
| 217 | /* Venus must get null terminated string */ |
| 218 | memcpy((char *)(inp) + offset, name, length); |
| 219 | *((char *)inp + offset + length) = '\0'; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 220 | |
Jan Harkes | a1b0aa8 | 2007-07-19 01:48:50 -0700 | [diff] [blame] | 221 | error = coda_upcall(coda_vcp(sb), insize, &outsize, inp); |
Jan Harkes | 970648e | 2007-07-19 01:48:48 -0700 | [diff] [blame] | 222 | if (!error) { |
| 223 | *attrs = outp->coda_mkdir.attr; |
| 224 | *newfid = outp->coda_mkdir.VFid; |
| 225 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | |
Dan Carpenter | 936dae4 | 2019-07-16 16:28:41 -0700 | [diff] [blame] | 227 | kvfree(inp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 228 | return error; |
| 229 | } |
| 230 | |
| 231 | |
| 232 | int venus_rename(struct super_block *sb, struct CodaFid *old_fid, |
| 233 | struct CodaFid *new_fid, size_t old_length, |
| 234 | size_t new_length, const char *old_name, |
| 235 | const char *new_name) |
| 236 | { |
| 237 | union inputArgs *inp; |
| 238 | union outputArgs *outp; |
| 239 | int insize, outsize, error; |
| 240 | int offset, s; |
| 241 | |
| 242 | offset = INSIZE(rename); |
| 243 | insize = max_t(unsigned int, offset + new_length + old_length + 8, |
| 244 | OUTSIZE(rename)); |
| 245 | UPARG(CODA_RENAME); |
| 246 | |
| 247 | inp->coda_rename.sourceFid = *old_fid; |
| 248 | inp->coda_rename.destFid = *new_fid; |
| 249 | inp->coda_rename.srcname = offset; |
| 250 | |
| 251 | /* Venus must receive an null terminated string */ |
| 252 | s = ( old_length & ~0x3) +4; /* round up to word boundary */ |
| 253 | memcpy((char *)(inp) + offset, old_name, old_length); |
| 254 | *((char *)inp + offset + old_length) = '\0'; |
| 255 | |
| 256 | /* another null terminated string for Venus */ |
| 257 | offset += s; |
| 258 | inp->coda_rename.destname = offset; |
| 259 | s = ( new_length & ~0x3) +4; /* round up to word boundary */ |
| 260 | memcpy((char *)(inp) + offset, new_name, new_length); |
| 261 | *((char *)inp + offset + new_length) = '\0'; |
| 262 | |
Jan Harkes | a1b0aa8 | 2007-07-19 01:48:50 -0700 | [diff] [blame] | 263 | error = coda_upcall(coda_vcp(sb), insize, &outsize, inp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 264 | |
Dan Carpenter | 936dae4 | 2019-07-16 16:28:41 -0700 | [diff] [blame] | 265 | kvfree(inp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 266 | return error; |
| 267 | } |
| 268 | |
| 269 | int venus_create(struct super_block *sb, struct CodaFid *dirfid, |
| 270 | const char *name, int length, int excl, int mode, |
| 271 | struct CodaFid *newfid, struct coda_vattr *attrs) |
| 272 | { |
| 273 | union inputArgs *inp; |
| 274 | union outputArgs *outp; |
| 275 | int insize, outsize, error; |
| 276 | int offset; |
| 277 | |
| 278 | offset = INSIZE(create); |
| 279 | insize = max_t(unsigned int, offset + length + 1, OUTSIZE(create)); |
| 280 | UPARG(CODA_CREATE); |
| 281 | |
| 282 | inp->coda_create.VFid = *dirfid; |
| 283 | inp->coda_create.attr.va_mode = mode; |
| 284 | inp->coda_create.excl = excl; |
| 285 | inp->coda_create.mode = mode; |
| 286 | inp->coda_create.name = offset; |
| 287 | |
| 288 | /* Venus must get null terminated string */ |
| 289 | memcpy((char *)(inp) + offset, name, length); |
| 290 | *((char *)inp + offset + length) = '\0'; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 291 | |
Jan Harkes | a1b0aa8 | 2007-07-19 01:48:50 -0700 | [diff] [blame] | 292 | error = coda_upcall(coda_vcp(sb), insize, &outsize, inp); |
Jan Harkes | 970648e | 2007-07-19 01:48:48 -0700 | [diff] [blame] | 293 | if (!error) { |
| 294 | *attrs = outp->coda_create.attr; |
| 295 | *newfid = outp->coda_create.VFid; |
| 296 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | |
Dan Carpenter | 936dae4 | 2019-07-16 16:28:41 -0700 | [diff] [blame] | 298 | kvfree(inp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 299 | return error; |
| 300 | } |
| 301 | |
| 302 | int venus_rmdir(struct super_block *sb, struct CodaFid *dirfid, |
| 303 | const char *name, int length) |
| 304 | { |
| 305 | union inputArgs *inp; |
| 306 | union outputArgs *outp; |
| 307 | int insize, outsize, error; |
| 308 | int offset; |
| 309 | |
| 310 | offset = INSIZE(rmdir); |
| 311 | insize = max_t(unsigned int, offset + length + 1, OUTSIZE(rmdir)); |
| 312 | UPARG(CODA_RMDIR); |
| 313 | |
| 314 | inp->coda_rmdir.VFid = *dirfid; |
| 315 | inp->coda_rmdir.name = offset; |
| 316 | memcpy((char *)(inp) + offset, name, length); |
| 317 | *((char *)inp + offset + length) = '\0'; |
Jan Harkes | a1b0aa8 | 2007-07-19 01:48:50 -0700 | [diff] [blame] | 318 | |
| 319 | error = coda_upcall(coda_vcp(sb), insize, &outsize, inp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 320 | |
Dan Carpenter | 936dae4 | 2019-07-16 16:28:41 -0700 | [diff] [blame] | 321 | kvfree(inp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 322 | return error; |
| 323 | } |
| 324 | |
| 325 | int venus_remove(struct super_block *sb, struct CodaFid *dirfid, |
| 326 | const char *name, int length) |
| 327 | { |
| 328 | union inputArgs *inp; |
| 329 | union outputArgs *outp; |
| 330 | int error=0, insize, outsize, offset; |
| 331 | |
| 332 | offset = INSIZE(remove); |
| 333 | insize = max_t(unsigned int, offset + length + 1, OUTSIZE(remove)); |
| 334 | UPARG(CODA_REMOVE); |
| 335 | |
| 336 | inp->coda_remove.VFid = *dirfid; |
| 337 | inp->coda_remove.name = offset; |
| 338 | memcpy((char *)(inp) + offset, name, length); |
| 339 | *((char *)inp + offset + length) = '\0'; |
Jan Harkes | a1b0aa8 | 2007-07-19 01:48:50 -0700 | [diff] [blame] | 340 | |
| 341 | error = coda_upcall(coda_vcp(sb), insize, &outsize, inp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | |
Dan Carpenter | 936dae4 | 2019-07-16 16:28:41 -0700 | [diff] [blame] | 343 | kvfree(inp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 344 | return error; |
| 345 | } |
| 346 | |
| 347 | int venus_readlink(struct super_block *sb, struct CodaFid *fid, |
| 348 | char *buffer, int *length) |
| 349 | { |
| 350 | union inputArgs *inp; |
| 351 | union outputArgs *outp; |
| 352 | int insize, outsize, error; |
| 353 | int retlen; |
| 354 | char *result; |
| 355 | |
| 356 | insize = max_t(unsigned int, |
Jan Harkes | 3725e9d | 2015-09-09 15:38:01 -0700 | [diff] [blame] | 357 | INSIZE(readlink), OUTSIZE(readlink)+ *length); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | UPARG(CODA_READLINK); |
| 359 | |
| 360 | inp->coda_readlink.VFid = *fid; |
Jan Harkes | 970648e | 2007-07-19 01:48:48 -0700 | [diff] [blame] | 361 | |
Jan Harkes | a1b0aa8 | 2007-07-19 01:48:50 -0700 | [diff] [blame] | 362 | error = coda_upcall(coda_vcp(sb), insize, &outsize, inp); |
Jan Harkes | 970648e | 2007-07-19 01:48:48 -0700 | [diff] [blame] | 363 | if (!error) { |
| 364 | retlen = outp->coda_readlink.count; |
Jan Harkes | 3725e9d | 2015-09-09 15:38:01 -0700 | [diff] [blame] | 365 | if (retlen >= *length) |
| 366 | retlen = *length - 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | *length = retlen; |
| 368 | result = (char *)outp + (long)outp->coda_readlink.data; |
| 369 | memcpy(buffer, result, retlen); |
| 370 | *(buffer + retlen) = '\0'; |
| 371 | } |
Jan Harkes | 970648e | 2007-07-19 01:48:48 -0700 | [diff] [blame] | 372 | |
Dan Carpenter | 936dae4 | 2019-07-16 16:28:41 -0700 | [diff] [blame] | 373 | kvfree(inp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 374 | return error; |
| 375 | } |
| 376 | |
| 377 | |
| 378 | |
| 379 | int venus_link(struct super_block *sb, struct CodaFid *fid, |
| 380 | struct CodaFid *dirfid, const char *name, int len ) |
| 381 | { |
| 382 | union inputArgs *inp; |
| 383 | union outputArgs *outp; |
| 384 | int insize, outsize, error; |
| 385 | int offset; |
| 386 | |
| 387 | offset = INSIZE(link); |
| 388 | insize = max_t(unsigned int, offset + len + 1, OUTSIZE(link)); |
| 389 | UPARG(CODA_LINK); |
| 390 | |
| 391 | inp->coda_link.sourceFid = *fid; |
| 392 | inp->coda_link.destFid = *dirfid; |
| 393 | inp->coda_link.tname = offset; |
| 394 | |
| 395 | /* make sure strings are null terminated */ |
| 396 | memcpy((char *)(inp) + offset, name, len); |
| 397 | *((char *)inp + offset + len) = '\0'; |
Jan Harkes | a1b0aa8 | 2007-07-19 01:48:50 -0700 | [diff] [blame] | 398 | |
| 399 | error = coda_upcall(coda_vcp(sb), insize, &outsize, inp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 400 | |
Dan Carpenter | 936dae4 | 2019-07-16 16:28:41 -0700 | [diff] [blame] | 401 | kvfree(inp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 402 | return error; |
| 403 | } |
| 404 | |
| 405 | int venus_symlink(struct super_block *sb, struct CodaFid *fid, |
| 406 | const char *name, int len, |
| 407 | const char *symname, int symlen) |
| 408 | { |
| 409 | union inputArgs *inp; |
| 410 | union outputArgs *outp; |
| 411 | int insize, outsize, error; |
| 412 | int offset, s; |
| 413 | |
| 414 | offset = INSIZE(symlink); |
| 415 | insize = max_t(unsigned int, offset + len + symlen + 8, OUTSIZE(symlink)); |
| 416 | UPARG(CODA_SYMLINK); |
| 417 | |
| 418 | /* inp->coda_symlink.attr = *tva; XXXXXX */ |
| 419 | inp->coda_symlink.VFid = *fid; |
| 420 | |
| 421 | /* Round up to word boundary and null terminate */ |
| 422 | inp->coda_symlink.srcname = offset; |
| 423 | s = ( symlen & ~0x3 ) + 4; |
| 424 | memcpy((char *)(inp) + offset, symname, symlen); |
| 425 | *((char *)inp + offset + symlen) = '\0'; |
| 426 | |
| 427 | /* Round up to word boundary and null terminate */ |
| 428 | offset += s; |
| 429 | inp->coda_symlink.tname = offset; |
| 430 | s = (len & ~0x3) + 4; |
| 431 | memcpy((char *)(inp) + offset, name, len); |
| 432 | *((char *)inp + offset + len) = '\0'; |
| 433 | |
Jan Harkes | a1b0aa8 | 2007-07-19 01:48:50 -0700 | [diff] [blame] | 434 | error = coda_upcall(coda_vcp(sb), insize, &outsize, inp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 435 | |
Dan Carpenter | 936dae4 | 2019-07-16 16:28:41 -0700 | [diff] [blame] | 436 | kvfree(inp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 437 | return error; |
| 438 | } |
| 439 | |
| 440 | int venus_fsync(struct super_block *sb, struct CodaFid *fid) |
| 441 | { |
| 442 | union inputArgs *inp; |
| 443 | union outputArgs *outp; |
| 444 | int insize, outsize, error; |
| 445 | |
| 446 | insize=SIZE(fsync); |
| 447 | UPARG(CODA_FSYNC); |
| 448 | |
Jan Harkes | a1b0aa8 | 2007-07-19 01:48:50 -0700 | [diff] [blame] | 449 | inp->coda_fsync.VFid = *fid; |
Jan Harkes | d337b66 | 2017-09-27 15:52:12 -0400 | [diff] [blame] | 450 | error = coda_upcall(coda_vcp(sb), insize, &outsize, inp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 451 | |
Dan Carpenter | 936dae4 | 2019-07-16 16:28:41 -0700 | [diff] [blame] | 452 | kvfree(inp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 453 | return error; |
| 454 | } |
| 455 | |
| 456 | int venus_access(struct super_block *sb, struct CodaFid *fid, int mask) |
| 457 | { |
| 458 | union inputArgs *inp; |
| 459 | union outputArgs *outp; |
| 460 | int insize, outsize, error; |
| 461 | |
| 462 | insize = SIZE(access); |
| 463 | UPARG(CODA_ACCESS); |
| 464 | |
| 465 | inp->coda_access.VFid = *fid; |
| 466 | inp->coda_access.flags = mask; |
| 467 | |
Jan Harkes | a1b0aa8 | 2007-07-19 01:48:50 -0700 | [diff] [blame] | 468 | error = coda_upcall(coda_vcp(sb), insize, &outsize, inp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 469 | |
Dan Carpenter | 936dae4 | 2019-07-16 16:28:41 -0700 | [diff] [blame] | 470 | kvfree(inp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 471 | return error; |
| 472 | } |
| 473 | |
| 474 | |
| 475 | int venus_pioctl(struct super_block *sb, struct CodaFid *fid, |
| 476 | unsigned int cmd, struct PioctlData *data) |
| 477 | { |
| 478 | union inputArgs *inp; |
| 479 | union outputArgs *outp; |
| 480 | int insize, outsize, error; |
| 481 | int iocsize; |
| 482 | |
| 483 | insize = VC_MAXMSGSIZE; |
| 484 | UPARG(CODA_IOCTL); |
| 485 | |
| 486 | /* build packet for Venus */ |
| 487 | if (data->vi.in_size > VC_MAXDATASIZE) { |
| 488 | error = -EINVAL; |
| 489 | goto exit; |
| 490 | } |
| 491 | |
| 492 | if (data->vi.out_size > VC_MAXDATASIZE) { |
| 493 | error = -EINVAL; |
| 494 | goto exit; |
| 495 | } |
| 496 | |
| 497 | inp->coda_ioctl.VFid = *fid; |
| 498 | |
| 499 | /* the cmd field was mutated by increasing its size field to |
| 500 | * reflect the path and follow args. We need to subtract that |
| 501 | * out before sending the command to Venus. */ |
| 502 | inp->coda_ioctl.cmd = (cmd & ~(PIOCPARM_MASK << 16)); |
| 503 | iocsize = ((cmd >> 16) & PIOCPARM_MASK) - sizeof(char *) - sizeof(int); |
| 504 | inp->coda_ioctl.cmd |= (iocsize & PIOCPARM_MASK) << 16; |
| 505 | |
| 506 | /* in->coda_ioctl.rwflag = flag; */ |
| 507 | inp->coda_ioctl.len = data->vi.in_size; |
| 508 | inp->coda_ioctl.data = (char *)(INSIZE(ioctl)); |
| 509 | |
| 510 | /* get the data out of user space */ |
Fabian Frederick | d9b4b31 | 2014-06-06 14:36:18 -0700 | [diff] [blame] | 511 | if (copy_from_user((char *)inp + (long)inp->coda_ioctl.data, |
| 512 | data->vi.in, data->vi.in_size)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 513 | error = -EINVAL; |
| 514 | goto exit; |
| 515 | } |
| 516 | |
Jan Harkes | a1b0aa8 | 2007-07-19 01:48:50 -0700 | [diff] [blame] | 517 | error = coda_upcall(coda_vcp(sb), SIZE(ioctl) + data->vi.in_size, |
| 518 | &outsize, inp); |
| 519 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 520 | if (error) { |
Fabian Frederick | 6d6bd94 | 2014-06-06 14:36:20 -0700 | [diff] [blame] | 521 | pr_warn("%s: Venus returns: %d for %s\n", |
| 522 | __func__, error, coda_f2s(fid)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 523 | goto exit; |
| 524 | } |
| 525 | |
| 526 | if (outsize < (long)outp->coda_ioctl.data + outp->coda_ioctl.len) { |
| 527 | error = -EINVAL; |
| 528 | goto exit; |
| 529 | } |
| 530 | |
| 531 | /* Copy out the OUT buffer. */ |
| 532 | if (outp->coda_ioctl.len > data->vi.out_size) { |
| 533 | error = -EINVAL; |
| 534 | goto exit; |
| 535 | } |
| 536 | |
| 537 | /* Copy out the OUT buffer. */ |
| 538 | if (copy_to_user(data->vi.out, |
| 539 | (char *)outp + (long)outp->coda_ioctl.data, |
| 540 | outp->coda_ioctl.len)) { |
| 541 | error = -EFAULT; |
| 542 | goto exit; |
| 543 | } |
| 544 | |
| 545 | exit: |
Dan Carpenter | 936dae4 | 2019-07-16 16:28:41 -0700 | [diff] [blame] | 546 | kvfree(inp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 547 | return error; |
| 548 | } |
| 549 | |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 550 | int venus_statfs(struct dentry *dentry, struct kstatfs *sfs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 551 | { |
| 552 | union inputArgs *inp; |
| 553 | union outputArgs *outp; |
| 554 | int insize, outsize, error; |
| 555 | |
Fabian Frederick | 50e9a6e | 2019-07-16 16:28:57 -0700 | [diff] [blame] | 556 | insize = SIZE(statfs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 557 | UPARG(CODA_STATFS); |
| 558 | |
Jan Harkes | a1b0aa8 | 2007-07-19 01:48:50 -0700 | [diff] [blame] | 559 | error = coda_upcall(coda_vcp(dentry->d_sb), insize, &outsize, inp); |
Jan Harkes | 970648e | 2007-07-19 01:48:48 -0700 | [diff] [blame] | 560 | if (!error) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 561 | sfs->f_blocks = outp->coda_statfs.stat.f_blocks; |
| 562 | sfs->f_bfree = outp->coda_statfs.stat.f_bfree; |
| 563 | sfs->f_bavail = outp->coda_statfs.stat.f_bavail; |
| 564 | sfs->f_files = outp->coda_statfs.stat.f_files; |
| 565 | sfs->f_ffree = outp->coda_statfs.stat.f_ffree; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 566 | } |
| 567 | |
Dan Carpenter | 936dae4 | 2019-07-16 16:28:41 -0700 | [diff] [blame] | 568 | kvfree(inp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 569 | return error; |
| 570 | } |
| 571 | |
Pedro Cuadra | a9fba24 | 2019-07-16 16:29:13 -0700 | [diff] [blame] | 572 | int venus_access_intent(struct super_block *sb, struct CodaFid *fid, |
| 573 | bool *access_intent_supported, |
| 574 | size_t count, loff_t ppos, int type) |
| 575 | { |
| 576 | union inputArgs *inp; |
| 577 | union outputArgs *outp; |
| 578 | int insize, outsize, error; |
| 579 | bool finalizer = |
| 580 | type == CODA_ACCESS_TYPE_READ_FINISH || |
| 581 | type == CODA_ACCESS_TYPE_WRITE_FINISH; |
| 582 | |
| 583 | if (!*access_intent_supported && !finalizer) |
| 584 | return 0; |
| 585 | |
| 586 | insize = SIZE(access_intent); |
| 587 | UPARG(CODA_ACCESS_INTENT); |
| 588 | |
| 589 | inp->coda_access_intent.VFid = *fid; |
| 590 | inp->coda_access_intent.count = count; |
| 591 | inp->coda_access_intent.pos = ppos; |
| 592 | inp->coda_access_intent.type = type; |
| 593 | |
| 594 | error = coda_upcall(coda_vcp(sb), insize, |
| 595 | finalizer ? NULL : &outsize, inp); |
| 596 | |
| 597 | /* |
| 598 | * we have to free the request buffer for synchronous upcalls |
| 599 | * or when asynchronous upcalls fail, but not when asynchronous |
| 600 | * upcalls succeed |
| 601 | */ |
| 602 | if (!finalizer || error) |
| 603 | kvfree(inp); |
| 604 | |
| 605 | /* Chunked access is not supported or an old Coda client */ |
| 606 | if (error == -EOPNOTSUPP) { |
| 607 | *access_intent_supported = false; |
| 608 | error = 0; |
| 609 | } |
| 610 | return error; |
| 611 | } |
| 612 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 613 | /* |
| 614 | * coda_upcall and coda_downcall routines. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 615 | */ |
Al Viro | 5f47c7e | 2007-07-20 00:23:31 +0100 | [diff] [blame] | 616 | static void coda_block_signals(sigset_t *old) |
Jan Harkes | d9664c9 | 2007-07-19 01:48:46 -0700 | [diff] [blame] | 617 | { |
| 618 | spin_lock_irq(¤t->sighand->siglock); |
| 619 | *old = current->blocked; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 620 | |
Jan Harkes | d9664c9 | 2007-07-19 01:48:46 -0700 | [diff] [blame] | 621 | sigfillset(¤t->blocked); |
| 622 | sigdelset(¤t->blocked, SIGKILL); |
| 623 | sigdelset(¤t->blocked, SIGSTOP); |
| 624 | sigdelset(¤t->blocked, SIGINT); |
| 625 | |
| 626 | recalc_sigpending(); |
| 627 | spin_unlock_irq(¤t->sighand->siglock); |
| 628 | } |
| 629 | |
Al Viro | 5f47c7e | 2007-07-20 00:23:31 +0100 | [diff] [blame] | 630 | static void coda_unblock_signals(sigset_t *old) |
Jan Harkes | d9664c9 | 2007-07-19 01:48:46 -0700 | [diff] [blame] | 631 | { |
| 632 | spin_lock_irq(¤t->sighand->siglock); |
| 633 | current->blocked = *old; |
| 634 | recalc_sigpending(); |
| 635 | spin_unlock_irq(¤t->sighand->siglock); |
| 636 | } |
| 637 | |
| 638 | /* Don't allow signals to interrupt the following upcalls before venus |
| 639 | * has seen them, |
| 640 | * - CODA_CLOSE or CODA_RELEASE upcall (to avoid reference count problems) |
| 641 | * - CODA_STORE (to avoid data loss) |
Pedro Cuadra | a9fba24 | 2019-07-16 16:29:13 -0700 | [diff] [blame] | 642 | * - CODA_ACCESS_INTENT (to avoid reference count problems) |
Jan Harkes | d9664c9 | 2007-07-19 01:48:46 -0700 | [diff] [blame] | 643 | */ |
| 644 | #define CODA_INTERRUPTIBLE(r) (!coda_hard && \ |
| 645 | (((r)->uc_opcode != CODA_CLOSE && \ |
| 646 | (r)->uc_opcode != CODA_STORE && \ |
Pedro Cuadra | a9fba24 | 2019-07-16 16:29:13 -0700 | [diff] [blame] | 647 | (r)->uc_opcode != CODA_ACCESS_INTENT && \ |
Jan Harkes | d9664c9 | 2007-07-19 01:48:46 -0700 | [diff] [blame] | 648 | (r)->uc_opcode != CODA_RELEASE) || \ |
Jens Axboe | 4aeefdc | 2010-08-03 13:22:51 +0200 | [diff] [blame] | 649 | (r)->uc_flags & CODA_REQ_READ)) |
Jan Harkes | d9664c9 | 2007-07-19 01:48:46 -0700 | [diff] [blame] | 650 | |
Yoshihisa Abe | da47c19 | 2010-10-25 02:03:46 -0400 | [diff] [blame] | 651 | static inline void coda_waitfor_upcall(struct venus_comm *vcp, |
| 652 | struct upc_req *req) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 653 | { |
| 654 | DECLARE_WAITQUEUE(wait, current); |
Jan Harkes | d9664c9 | 2007-07-19 01:48:46 -0700 | [diff] [blame] | 655 | unsigned long timeout = jiffies + coda_timeout * HZ; |
| 656 | sigset_t old; |
| 657 | int blocked; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 658 | |
Al Viro | 5f47c7e | 2007-07-20 00:23:31 +0100 | [diff] [blame] | 659 | coda_block_signals(&old); |
Jan Harkes | d9664c9 | 2007-07-19 01:48:46 -0700 | [diff] [blame] | 660 | blocked = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 661 | |
Jan Harkes | d9664c9 | 2007-07-19 01:48:46 -0700 | [diff] [blame] | 662 | add_wait_queue(&req->uc_sleep, &wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 663 | for (;;) { |
Jan Harkes | d9664c9 | 2007-07-19 01:48:46 -0700 | [diff] [blame] | 664 | if (CODA_INTERRUPTIBLE(req)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 665 | set_current_state(TASK_INTERRUPTIBLE); |
| 666 | else |
| 667 | set_current_state(TASK_UNINTERRUPTIBLE); |
| 668 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 669 | /* got a reply */ |
Jens Axboe | 4aeefdc | 2010-08-03 13:22:51 +0200 | [diff] [blame] | 670 | if (req->uc_flags & (CODA_REQ_WRITE | CODA_REQ_ABORT)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 671 | break; |
| 672 | |
Jan Harkes | d9664c9 | 2007-07-19 01:48:46 -0700 | [diff] [blame] | 673 | if (blocked && time_after(jiffies, timeout) && |
| 674 | CODA_INTERRUPTIBLE(req)) |
| 675 | { |
Al Viro | 5f47c7e | 2007-07-20 00:23:31 +0100 | [diff] [blame] | 676 | coda_unblock_signals(&old); |
Jan Harkes | d9664c9 | 2007-07-19 01:48:46 -0700 | [diff] [blame] | 677 | blocked = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 678 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 679 | |
Jan Harkes | d9664c9 | 2007-07-19 01:48:46 -0700 | [diff] [blame] | 680 | if (signal_pending(current)) { |
| 681 | list_del(&req->uc_chain); |
| 682 | break; |
| 683 | } |
| 684 | |
Yoshihisa Abe | da47c19 | 2010-10-25 02:03:46 -0400 | [diff] [blame] | 685 | mutex_unlock(&vcp->vc_mutex); |
Jan Harkes | d9664c9 | 2007-07-19 01:48:46 -0700 | [diff] [blame] | 686 | if (blocked) |
| 687 | schedule_timeout(HZ); |
| 688 | else |
| 689 | schedule(); |
Yoshihisa Abe | da47c19 | 2010-10-25 02:03:46 -0400 | [diff] [blame] | 690 | mutex_lock(&vcp->vc_mutex); |
Jan Harkes | d9664c9 | 2007-07-19 01:48:46 -0700 | [diff] [blame] | 691 | } |
| 692 | if (blocked) |
Al Viro | 5f47c7e | 2007-07-20 00:23:31 +0100 | [diff] [blame] | 693 | coda_unblock_signals(&old); |
Jan Harkes | d9664c9 | 2007-07-19 01:48:46 -0700 | [diff] [blame] | 694 | |
| 695 | remove_wait_queue(&req->uc_sleep, &wait); |
| 696 | set_current_state(TASK_RUNNING); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 697 | } |
| 698 | |
| 699 | |
Jan Harkes | a1b0aa8 | 2007-07-19 01:48:50 -0700 | [diff] [blame] | 700 | /* |
| 701 | * coda_upcall will return an error in the case of |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 702 | * failed communication with Venus _or_ will peek at Venus |
| 703 | * reply and return Venus' error. |
| 704 | * |
| 705 | * As venus has 2 types of errors, normal errors (positive) and internal |
| 706 | * errors (negative), normal errors are negated, while internal errors |
| 707 | * are all mapped to -EINTR, while showing a nice warning message. (jh) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 708 | */ |
Jan Harkes | a1b0aa8 | 2007-07-19 01:48:50 -0700 | [diff] [blame] | 709 | static int coda_upcall(struct venus_comm *vcp, |
Jan Harkes | fe71b5f | 2007-07-19 01:48:46 -0700 | [diff] [blame] | 710 | int inSize, int *outSize, |
| 711 | union inputArgs *buffer) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 712 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 713 | union outputArgs *out; |
Jan Harkes | fe71b5f | 2007-07-19 01:48:46 -0700 | [diff] [blame] | 714 | union inputArgs *sig_inputArgs; |
Yoshihisa Abe | f7cc02b8 | 2010-10-25 02:03:45 -0400 | [diff] [blame] | 715 | struct upc_req *req = NULL, *sig_req; |
| 716 | int error; |
| 717 | |
Yoshihisa Abe | da47c19 | 2010-10-25 02:03:46 -0400 | [diff] [blame] | 718 | mutex_lock(&vcp->vc_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 719 | |
Jan Harkes | a1b0aa8 | 2007-07-19 01:48:50 -0700 | [diff] [blame] | 720 | if (!vcp->vc_inuse) { |
Fabian Frederick | f38cfb25 | 2014-06-06 14:36:19 -0700 | [diff] [blame] | 721 | pr_notice("Venus dead, not sending upcall\n"); |
Yoshihisa Abe | f7cc02b8 | 2010-10-25 02:03:45 -0400 | [diff] [blame] | 722 | error = -ENXIO; |
| 723 | goto exit; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 724 | } |
| 725 | |
| 726 | /* Format the request message. */ |
Jan Harkes | 37461e1 | 2007-07-19 01:48:48 -0700 | [diff] [blame] | 727 | req = kmalloc(sizeof(struct upc_req), GFP_KERNEL); |
Yoshihisa Abe | f7cc02b8 | 2010-10-25 02:03:45 -0400 | [diff] [blame] | 728 | if (!req) { |
| 729 | error = -ENOMEM; |
| 730 | goto exit; |
| 731 | } |
Jan Harkes | fe71b5f | 2007-07-19 01:48:46 -0700 | [diff] [blame] | 732 | |
Pedro Cuadra | a9fba24 | 2019-07-16 16:29:13 -0700 | [diff] [blame] | 733 | buffer->ih.unique = ++vcp->vc_seq; |
Jan Harkes | fe71b5f | 2007-07-19 01:48:46 -0700 | [diff] [blame] | 734 | |
Pedro Cuadra | a9fba24 | 2019-07-16 16:29:13 -0700 | [diff] [blame] | 735 | req->uc_data = (void *)buffer; |
| 736 | req->uc_flags = outSize ? 0 : CODA_REQ_ASYNC; |
| 737 | req->uc_inSize = inSize; |
| 738 | req->uc_outSize = (outSize && *outSize) ? *outSize : inSize; |
| 739 | req->uc_opcode = buffer->ih.opcode; |
| 740 | req->uc_unique = buffer->ih.unique; |
| 741 | init_waitqueue_head(&req->uc_sleep); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 742 | |
| 743 | /* Append msg to pending queue and poke Venus. */ |
Jan Harkes | a1b0aa8 | 2007-07-19 01:48:50 -0700 | [diff] [blame] | 744 | list_add_tail(&req->uc_chain, &vcp->vc_pending); |
Jan Harkes | a1b0aa8 | 2007-07-19 01:48:50 -0700 | [diff] [blame] | 745 | wake_up_interruptible(&vcp->vc_waitq); |
Pedro Cuadra | a9fba24 | 2019-07-16 16:29:13 -0700 | [diff] [blame] | 746 | |
| 747 | if (req->uc_flags & CODA_REQ_ASYNC) { |
| 748 | mutex_unlock(&vcp->vc_mutex); |
| 749 | return 0; |
| 750 | } |
| 751 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 752 | /* We can be interrupted while we wait for Venus to process |
| 753 | * our request. If the interrupt occurs before Venus has read |
| 754 | * the request, we dequeue and return. If it occurs after the |
| 755 | * read but before the reply, we dequeue, send a signal |
| 756 | * message, and return. If it occurs after the reply we ignore |
| 757 | * it. In no case do we want to restart the syscall. If it |
| 758 | * was interrupted by a venus shutdown (psdev_close), return |
| 759 | * ENODEV. */ |
| 760 | |
| 761 | /* Go to sleep. Wake up on signals only after the timeout. */ |
Yoshihisa Abe | da47c19 | 2010-10-25 02:03:46 -0400 | [diff] [blame] | 762 | coda_waitfor_upcall(vcp, req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 763 | |
Jan Harkes | fe71b5f | 2007-07-19 01:48:46 -0700 | [diff] [blame] | 764 | /* Op went through, interrupt or not... */ |
Jens Axboe | 4aeefdc | 2010-08-03 13:22:51 +0200 | [diff] [blame] | 765 | if (req->uc_flags & CODA_REQ_WRITE) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 766 | out = (union outputArgs *)req->uc_data; |
| 767 | /* here we map positive Venus errors to kernel errors */ |
| 768 | error = -out->oh.result; |
| 769 | *outSize = req->uc_outSize; |
| 770 | goto exit; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 771 | } |
| 772 | |
Jan Harkes | fe71b5f | 2007-07-19 01:48:46 -0700 | [diff] [blame] | 773 | error = -EINTR; |
Jens Axboe | 4aeefdc | 2010-08-03 13:22:51 +0200 | [diff] [blame] | 774 | if ((req->uc_flags & CODA_REQ_ABORT) || !signal_pending(current)) { |
Fabian Frederick | f38cfb25 | 2014-06-06 14:36:19 -0700 | [diff] [blame] | 775 | pr_warn("Unexpected interruption.\n"); |
Jan Harkes | fe71b5f | 2007-07-19 01:48:46 -0700 | [diff] [blame] | 776 | goto exit; |
| 777 | } |
| 778 | |
Jan Harkes | fe71b5f | 2007-07-19 01:48:46 -0700 | [diff] [blame] | 779 | /* Interrupted before venus read it. */ |
Jens Axboe | 4aeefdc | 2010-08-03 13:22:51 +0200 | [diff] [blame] | 780 | if (!(req->uc_flags & CODA_REQ_READ)) |
Jan Harkes | fe71b5f | 2007-07-19 01:48:46 -0700 | [diff] [blame] | 781 | goto exit; |
| 782 | |
| 783 | /* Venus saw the upcall, make sure we can send interrupt signal */ |
Jan Harkes | a1b0aa8 | 2007-07-19 01:48:50 -0700 | [diff] [blame] | 784 | if (!vcp->vc_inuse) { |
Fabian Frederick | f38cfb25 | 2014-06-06 14:36:19 -0700 | [diff] [blame] | 785 | pr_info("Venus dead, not sending signal.\n"); |
Jan Harkes | fe71b5f | 2007-07-19 01:48:46 -0700 | [diff] [blame] | 786 | goto exit; |
| 787 | } |
| 788 | |
| 789 | error = -ENOMEM; |
Jan Harkes | 37461e1 | 2007-07-19 01:48:48 -0700 | [diff] [blame] | 790 | sig_req = kmalloc(sizeof(struct upc_req), GFP_KERNEL); |
Jan Harkes | fe71b5f | 2007-07-19 01:48:46 -0700 | [diff] [blame] | 791 | if (!sig_req) goto exit; |
| 792 | |
Pedro Cuadra | a9fba24 | 2019-07-16 16:29:13 -0700 | [diff] [blame] | 793 | sig_inputArgs = kvzalloc(sizeof(struct coda_in_hdr), GFP_KERNEL); |
| 794 | if (!sig_inputArgs) { |
Jan Harkes | 37461e1 | 2007-07-19 01:48:48 -0700 | [diff] [blame] | 795 | kfree(sig_req); |
Jan Harkes | fe71b5f | 2007-07-19 01:48:46 -0700 | [diff] [blame] | 796 | goto exit; |
| 797 | } |
| 798 | |
| 799 | error = -EINTR; |
Jan Harkes | fe71b5f | 2007-07-19 01:48:46 -0700 | [diff] [blame] | 800 | sig_inputArgs->ih.opcode = CODA_SIGNAL; |
| 801 | sig_inputArgs->ih.unique = req->uc_unique; |
| 802 | |
Jens Axboe | 4aeefdc | 2010-08-03 13:22:51 +0200 | [diff] [blame] | 803 | sig_req->uc_flags = CODA_REQ_ASYNC; |
Jan Harkes | fe71b5f | 2007-07-19 01:48:46 -0700 | [diff] [blame] | 804 | sig_req->uc_opcode = sig_inputArgs->ih.opcode; |
| 805 | sig_req->uc_unique = sig_inputArgs->ih.unique; |
Pedro Cuadra | a9fba24 | 2019-07-16 16:29:13 -0700 | [diff] [blame] | 806 | sig_req->uc_data = (void *)sig_inputArgs; |
Jan Harkes | fe71b5f | 2007-07-19 01:48:46 -0700 | [diff] [blame] | 807 | sig_req->uc_inSize = sizeof(struct coda_in_hdr); |
| 808 | sig_req->uc_outSize = sizeof(struct coda_in_hdr); |
| 809 | |
| 810 | /* insert at head of queue! */ |
Jan Harkes | a1b0aa8 | 2007-07-19 01:48:50 -0700 | [diff] [blame] | 811 | list_add(&(sig_req->uc_chain), &vcp->vc_pending); |
| 812 | wake_up_interruptible(&vcp->vc_waitq); |
Jan Harkes | fe71b5f | 2007-07-19 01:48:46 -0700 | [diff] [blame] | 813 | |
| 814 | exit: |
Jan Harkes | 37461e1 | 2007-07-19 01:48:48 -0700 | [diff] [blame] | 815 | kfree(req); |
Yoshihisa Abe | da47c19 | 2010-10-25 02:03:46 -0400 | [diff] [blame] | 816 | mutex_unlock(&vcp->vc_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 817 | return error; |
| 818 | } |
| 819 | |
| 820 | /* |
| 821 | The statements below are part of the Coda opportunistic |
| 822 | programming -- taken from the Mach/BSD kernel code for Coda. |
| 823 | You don't get correct semantics by stating what needs to be |
| 824 | done without guaranteeing the invariants needed for it to happen. |
| 825 | When will be have time to find out what exactly is going on? (pjb) |
| 826 | */ |
| 827 | |
| 828 | |
| 829 | /* |
| 830 | * There are 7 cases where cache invalidations occur. The semantics |
| 831 | * of each is listed here: |
| 832 | * |
| 833 | * CODA_FLUSH -- flush all entries from the name cache and the cnode cache. |
| 834 | * CODA_PURGEUSER -- flush all entries from the name cache for a specific user |
| 835 | * This call is a result of token expiration. |
| 836 | * |
| 837 | * The next arise as the result of callbacks on a file or directory. |
| 838 | * CODA_ZAPFILE -- flush the cached attributes for a file. |
| 839 | |
| 840 | * CODA_ZAPDIR -- flush the attributes for the dir and |
| 841 | * force a new lookup for all the children |
| 842 | of this dir. |
| 843 | |
| 844 | * |
| 845 | * The next is a result of Venus detecting an inconsistent file. |
| 846 | * CODA_PURGEFID -- flush the attribute for the file |
| 847 | * purge it and its children from the dcache |
| 848 | * |
| 849 | * The last allows Venus to replace local fids with global ones |
| 850 | * during reintegration. |
| 851 | * |
| 852 | * CODA_REPLACE -- replace one CodaFid with another throughout the name cache */ |
| 853 | |
Jan Harkes | 6e51f8a | 2019-07-16 16:28:16 -0700 | [diff] [blame] | 854 | int coda_downcall(struct venus_comm *vcp, int opcode, union outputArgs *out, |
| 855 | size_t nbytes) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 856 | { |
Jan Harkes | 5fd31e9 | 2007-07-19 01:48:49 -0700 | [diff] [blame] | 857 | struct inode *inode = NULL; |
Yoshihisa Abe | da47c19 | 2010-10-25 02:03:46 -0400 | [diff] [blame] | 858 | struct CodaFid *fid = NULL, *newfid; |
Yoshihisa Abe | f7cc02b8 | 2010-10-25 02:03:45 -0400 | [diff] [blame] | 859 | struct super_block *sb; |
Jan Harkes | 5fd31e9 | 2007-07-19 01:48:49 -0700 | [diff] [blame] | 860 | |
Jan Harkes | 6e51f8a | 2019-07-16 16:28:16 -0700 | [diff] [blame] | 861 | /* |
| 862 | * Make sure we have received enough data from the cache |
| 863 | * manager to populate the necessary fields in the buffer |
| 864 | */ |
| 865 | switch (opcode) { |
| 866 | case CODA_PURGEUSER: |
| 867 | if (nbytes < sizeof(struct coda_purgeuser_out)) |
| 868 | return -EINVAL; |
| 869 | break; |
| 870 | |
| 871 | case CODA_ZAPDIR: |
| 872 | if (nbytes < sizeof(struct coda_zapdir_out)) |
| 873 | return -EINVAL; |
| 874 | break; |
| 875 | |
| 876 | case CODA_ZAPFILE: |
| 877 | if (nbytes < sizeof(struct coda_zapfile_out)) |
| 878 | return -EINVAL; |
| 879 | break; |
| 880 | |
| 881 | case CODA_PURGEFID: |
| 882 | if (nbytes < sizeof(struct coda_purgefid_out)) |
| 883 | return -EINVAL; |
| 884 | break; |
| 885 | |
| 886 | case CODA_REPLACE: |
| 887 | if (nbytes < sizeof(struct coda_replace_out)) |
| 888 | return -EINVAL; |
| 889 | break; |
| 890 | } |
| 891 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 892 | /* Handle invalidation requests. */ |
Yoshihisa Abe | da47c19 | 2010-10-25 02:03:46 -0400 | [diff] [blame] | 893 | mutex_lock(&vcp->vc_mutex); |
Yoshihisa Abe | f7cc02b8 | 2010-10-25 02:03:45 -0400 | [diff] [blame] | 894 | sb = vcp->vc_sb; |
| 895 | if (!sb || !sb->s_root) |
| 896 | goto unlock_out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 897 | |
Jan Harkes | 5fd31e9 | 2007-07-19 01:48:49 -0700 | [diff] [blame] | 898 | switch (opcode) { |
| 899 | case CODA_FLUSH: |
| 900 | coda_cache_clear_all(sb); |
| 901 | shrink_dcache_sb(sb); |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 902 | if (d_really_is_positive(sb->s_root)) |
| 903 | coda_flag_inode(d_inode(sb->s_root), C_FLUSH); |
Jan Harkes | 5fd31e9 | 2007-07-19 01:48:49 -0700 | [diff] [blame] | 904 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 905 | |
Jan Harkes | 5fd31e9 | 2007-07-19 01:48:49 -0700 | [diff] [blame] | 906 | case CODA_PURGEUSER: |
| 907 | coda_cache_clear_all(sb); |
| 908 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 909 | |
Jan Harkes | 5fd31e9 | 2007-07-19 01:48:49 -0700 | [diff] [blame] | 910 | case CODA_ZAPDIR: |
| 911 | fid = &out->coda_zapdir.CodaFid; |
Jan Harkes | 5fd31e9 | 2007-07-19 01:48:49 -0700 | [diff] [blame] | 912 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 913 | |
Jan Harkes | 5fd31e9 | 2007-07-19 01:48:49 -0700 | [diff] [blame] | 914 | case CODA_ZAPFILE: |
| 915 | fid = &out->coda_zapfile.CodaFid; |
Jan Harkes | 5fd31e9 | 2007-07-19 01:48:49 -0700 | [diff] [blame] | 916 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 917 | |
Jan Harkes | 5fd31e9 | 2007-07-19 01:48:49 -0700 | [diff] [blame] | 918 | case CODA_PURGEFID: |
| 919 | fid = &out->coda_purgefid.CodaFid; |
Jan Harkes | 5fd31e9 | 2007-07-19 01:48:49 -0700 | [diff] [blame] | 920 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 921 | |
Jan Harkes | 5fd31e9 | 2007-07-19 01:48:49 -0700 | [diff] [blame] | 922 | case CODA_REPLACE: |
| 923 | fid = &out->coda_replace.OldFid; |
Jan Harkes | 5fd31e9 | 2007-07-19 01:48:49 -0700 | [diff] [blame] | 924 | break; |
| 925 | } |
Yoshihisa Abe | da47c19 | 2010-10-25 02:03:46 -0400 | [diff] [blame] | 926 | if (fid) |
| 927 | inode = coda_fid_to_inode(fid, sb); |
Jan Harkes | 5fd31e9 | 2007-07-19 01:48:49 -0700 | [diff] [blame] | 928 | |
Yoshihisa Abe | f7cc02b8 | 2010-10-25 02:03:45 -0400 | [diff] [blame] | 929 | unlock_out: |
Yoshihisa Abe | da47c19 | 2010-10-25 02:03:46 -0400 | [diff] [blame] | 930 | mutex_unlock(&vcp->vc_mutex); |
Yoshihisa Abe | f7cc02b8 | 2010-10-25 02:03:45 -0400 | [diff] [blame] | 931 | |
Yoshihisa Abe | da47c19 | 2010-10-25 02:03:46 -0400 | [diff] [blame] | 932 | if (!inode) |
| 933 | return 0; |
| 934 | |
| 935 | switch (opcode) { |
| 936 | case CODA_ZAPDIR: |
| 937 | coda_flag_inode_children(inode, C_PURGE); |
| 938 | coda_flag_inode(inode, C_VATTR); |
| 939 | break; |
| 940 | |
| 941 | case CODA_ZAPFILE: |
| 942 | coda_flag_inode(inode, C_VATTR); |
| 943 | break; |
| 944 | |
| 945 | case CODA_PURGEFID: |
| 946 | coda_flag_inode_children(inode, C_PURGE); |
| 947 | |
| 948 | /* catch the dentries later if some are still busy */ |
| 949 | coda_flag_inode(inode, C_PURGE); |
| 950 | d_prune_aliases(inode); |
| 951 | break; |
| 952 | |
| 953 | case CODA_REPLACE: |
| 954 | newfid = &out->coda_replace.NewFid; |
| 955 | coda_replace_fid(inode, fid, newfid); |
| 956 | break; |
| 957 | } |
| 958 | iput(inode); |
Jan Harkes | 5fd31e9 | 2007-07-19 01:48:49 -0700 | [diff] [blame] | 959 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 960 | } |