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TOMOYO Linux Cross Reference
Linux/fs/orangefs/orangefs-utils.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  * (C) 2001 Clemson University and The University of Chicago
  4  * Copyright 2018 Omnibond Systems, L.L.C.
  5  *
  6  * See COPYING in top-level directory.
  7  */
  8 #include <linux/kernel.h>
  9 #include "protocol.h"
 10 #include "orangefs-kernel.h"
 11 #include "orangefs-dev-proto.h"
 12 #include "orangefs-bufmap.h"
 13 
 14 __s32 fsid_of_op(struct orangefs_kernel_op_s *op)
 15 {
 16         __s32 fsid = ORANGEFS_FS_ID_NULL;
 17 
 18         if (op) {
 19                 switch (op->upcall.type) {
 20                 case ORANGEFS_VFS_OP_FILE_IO:
 21                         fsid = op->upcall.req.io.refn.fs_id;
 22                         break;
 23                 case ORANGEFS_VFS_OP_LOOKUP:
 24                         fsid = op->upcall.req.lookup.parent_refn.fs_id;
 25                         break;
 26                 case ORANGEFS_VFS_OP_CREATE:
 27                         fsid = op->upcall.req.create.parent_refn.fs_id;
 28                         break;
 29                 case ORANGEFS_VFS_OP_GETATTR:
 30                         fsid = op->upcall.req.getattr.refn.fs_id;
 31                         break;
 32                 case ORANGEFS_VFS_OP_REMOVE:
 33                         fsid = op->upcall.req.remove.parent_refn.fs_id;
 34                         break;
 35                 case ORANGEFS_VFS_OP_MKDIR:
 36                         fsid = op->upcall.req.mkdir.parent_refn.fs_id;
 37                         break;
 38                 case ORANGEFS_VFS_OP_READDIR:
 39                         fsid = op->upcall.req.readdir.refn.fs_id;
 40                         break;
 41                 case ORANGEFS_VFS_OP_SETATTR:
 42                         fsid = op->upcall.req.setattr.refn.fs_id;
 43                         break;
 44                 case ORANGEFS_VFS_OP_SYMLINK:
 45                         fsid = op->upcall.req.sym.parent_refn.fs_id;
 46                         break;
 47                 case ORANGEFS_VFS_OP_RENAME:
 48                         fsid = op->upcall.req.rename.old_parent_refn.fs_id;
 49                         break;
 50                 case ORANGEFS_VFS_OP_STATFS:
 51                         fsid = op->upcall.req.statfs.fs_id;
 52                         break;
 53                 case ORANGEFS_VFS_OP_TRUNCATE:
 54                         fsid = op->upcall.req.truncate.refn.fs_id;
 55                         break;
 56                 case ORANGEFS_VFS_OP_RA_FLUSH:
 57                         fsid = op->upcall.req.ra_cache_flush.refn.fs_id;
 58                         break;
 59                 case ORANGEFS_VFS_OP_FS_UMOUNT:
 60                         fsid = op->upcall.req.fs_umount.fs_id;
 61                         break;
 62                 case ORANGEFS_VFS_OP_GETXATTR:
 63                         fsid = op->upcall.req.getxattr.refn.fs_id;
 64                         break;
 65                 case ORANGEFS_VFS_OP_SETXATTR:
 66                         fsid = op->upcall.req.setxattr.refn.fs_id;
 67                         break;
 68                 case ORANGEFS_VFS_OP_LISTXATTR:
 69                         fsid = op->upcall.req.listxattr.refn.fs_id;
 70                         break;
 71                 case ORANGEFS_VFS_OP_REMOVEXATTR:
 72                         fsid = op->upcall.req.removexattr.refn.fs_id;
 73                         break;
 74                 case ORANGEFS_VFS_OP_FSYNC:
 75                         fsid = op->upcall.req.fsync.refn.fs_id;
 76                         break;
 77                 default:
 78                         break;
 79                 }
 80         }
 81         return fsid;
 82 }
 83 
 84 static int orangefs_inode_flags(struct ORANGEFS_sys_attr_s *attrs)
 85 {
 86         int flags = 0;
 87         if (attrs->flags & ORANGEFS_IMMUTABLE_FL)
 88                 flags |= S_IMMUTABLE;
 89         else
 90                 flags &= ~S_IMMUTABLE;
 91         if (attrs->flags & ORANGEFS_APPEND_FL)
 92                 flags |= S_APPEND;
 93         else
 94                 flags &= ~S_APPEND;
 95         if (attrs->flags & ORANGEFS_NOATIME_FL)
 96                 flags |= S_NOATIME;
 97         else
 98                 flags &= ~S_NOATIME;
 99         return flags;
100 }
101 
102 static int orangefs_inode_perms(struct ORANGEFS_sys_attr_s *attrs)
103 {
104         int perm_mode = 0;
105 
106         if (attrs->perms & ORANGEFS_O_EXECUTE)
107                 perm_mode |= S_IXOTH;
108         if (attrs->perms & ORANGEFS_O_WRITE)
109                 perm_mode |= S_IWOTH;
110         if (attrs->perms & ORANGEFS_O_READ)
111                 perm_mode |= S_IROTH;
112 
113         if (attrs->perms & ORANGEFS_G_EXECUTE)
114                 perm_mode |= S_IXGRP;
115         if (attrs->perms & ORANGEFS_G_WRITE)
116                 perm_mode |= S_IWGRP;
117         if (attrs->perms & ORANGEFS_G_READ)
118                 perm_mode |= S_IRGRP;
119 
120         if (attrs->perms & ORANGEFS_U_EXECUTE)
121                 perm_mode |= S_IXUSR;
122         if (attrs->perms & ORANGEFS_U_WRITE)
123                 perm_mode |= S_IWUSR;
124         if (attrs->perms & ORANGEFS_U_READ)
125                 perm_mode |= S_IRUSR;
126 
127         if (attrs->perms & ORANGEFS_G_SGID)
128                 perm_mode |= S_ISGID;
129         if (attrs->perms & ORANGEFS_U_SUID)
130                 perm_mode |= S_ISUID;
131 
132         return perm_mode;
133 }
134 
135 /*
136  * NOTE: in kernel land, we never use the sys_attr->link_target for
137  * anything, so don't bother copying it into the sys_attr object here.
138  */
139 static inline void copy_attributes_from_inode(struct inode *inode,
140     struct ORANGEFS_sys_attr_s *attrs)
141 {
142         struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
143         attrs->mask = 0;
144         if (orangefs_inode->attr_valid & ATTR_UID) {
145                 attrs->owner = from_kuid(&init_user_ns, inode->i_uid);
146                 attrs->mask |= ORANGEFS_ATTR_SYS_UID;
147                 gossip_debug(GOSSIP_UTILS_DEBUG, "(UID) %d\n", attrs->owner);
148         }
149         if (orangefs_inode->attr_valid & ATTR_GID) {
150                 attrs->group = from_kgid(&init_user_ns, inode->i_gid);
151                 attrs->mask |= ORANGEFS_ATTR_SYS_GID;
152                 gossip_debug(GOSSIP_UTILS_DEBUG, "(GID) %d\n", attrs->group);
153         }
154 
155         if (orangefs_inode->attr_valid & ATTR_ATIME) {
156                 attrs->mask |= ORANGEFS_ATTR_SYS_ATIME;
157                 if (orangefs_inode->attr_valid & ATTR_ATIME_SET) {
158                         attrs->atime = (time64_t)inode->i_atime.tv_sec;
159                         attrs->mask |= ORANGEFS_ATTR_SYS_ATIME_SET;
160                 }
161         }
162         if (orangefs_inode->attr_valid & ATTR_MTIME) {
163                 attrs->mask |= ORANGEFS_ATTR_SYS_MTIME;
164                 if (orangefs_inode->attr_valid & ATTR_MTIME_SET) {
165                         attrs->mtime = (time64_t)inode->i_mtime.tv_sec;
166                         attrs->mask |= ORANGEFS_ATTR_SYS_MTIME_SET;
167                 }
168         }
169         if (orangefs_inode->attr_valid & ATTR_CTIME)
170                 attrs->mask |= ORANGEFS_ATTR_SYS_CTIME;
171 
172         /*
173          * ORANGEFS cannot set size with a setattr operation. Probably not
174          * likely to be requested through the VFS, but just in case, don't
175          * worry about ATTR_SIZE
176          */
177 
178         if (orangefs_inode->attr_valid & ATTR_MODE) {
179                 attrs->perms = ORANGEFS_util_translate_mode(inode->i_mode);
180                 attrs->mask |= ORANGEFS_ATTR_SYS_PERM;
181         }
182 }
183 
184 static int orangefs_inode_type(enum orangefs_ds_type objtype)
185 {
186         if (objtype == ORANGEFS_TYPE_METAFILE)
187                 return S_IFREG;
188         else if (objtype == ORANGEFS_TYPE_DIRECTORY)
189                 return S_IFDIR;
190         else if (objtype == ORANGEFS_TYPE_SYMLINK)
191                 return S_IFLNK;
192         else
193                 return -1;
194 }
195 
196 static void orangefs_make_bad_inode(struct inode *inode)
197 {
198         if (is_root_handle(inode)) {
199                 /*
200                  * if this occurs, the pvfs2-client-core was killed but we
201                  * can't afford to lose the inode operations and such
202                  * associated with the root handle in any case.
203                  */
204                 gossip_debug(GOSSIP_UTILS_DEBUG,
205                              "*** NOT making bad root inode %pU\n",
206                              get_khandle_from_ino(inode));
207         } else {
208                 gossip_debug(GOSSIP_UTILS_DEBUG,
209                              "*** making bad inode %pU\n",
210                              get_khandle_from_ino(inode));
211                 make_bad_inode(inode);
212         }
213 }
214 
215 static int orangefs_inode_is_stale(struct inode *inode,
216     struct ORANGEFS_sys_attr_s *attrs, char *link_target)
217 {
218         struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
219         int type = orangefs_inode_type(attrs->objtype);
220         /*
221          * If the inode type or symlink target have changed then this
222          * inode is stale.
223          */
224         if (type == -1 || !(inode->i_mode & type)) {
225                 orangefs_make_bad_inode(inode);
226                 return 1;
227         }
228         if (type == S_IFLNK && strncmp(orangefs_inode->link_target,
229             link_target, ORANGEFS_NAME_MAX)) {
230                 orangefs_make_bad_inode(inode);
231                 return 1;
232         }
233         return 0;
234 }
235 
236 int orangefs_inode_getattr(struct inode *inode, int flags)
237 {
238         struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
239         struct orangefs_kernel_op_s *new_op;
240         loff_t inode_size;
241         int ret, type;
242 
243         gossip_debug(GOSSIP_UTILS_DEBUG, "%s: called on inode %pU flags %d\n",
244             __func__, get_khandle_from_ino(inode), flags);
245 
246 again:
247         spin_lock(&inode->i_lock);
248         /* Must have all the attributes in the mask and be within cache time. */
249         if ((!flags && time_before(jiffies, orangefs_inode->getattr_time)) ||
250             orangefs_inode->attr_valid || inode->i_state & I_DIRTY_PAGES) {
251                 if (orangefs_inode->attr_valid) {
252                         spin_unlock(&inode->i_lock);
253                         write_inode_now(inode, 1);
254                         goto again;
255                 }
256                 spin_unlock(&inode->i_lock);
257                 return 0;
258         }
259         spin_unlock(&inode->i_lock);
260 
261         new_op = op_alloc(ORANGEFS_VFS_OP_GETATTR);
262         if (!new_op)
263                 return -ENOMEM;
264         new_op->upcall.req.getattr.refn = orangefs_inode->refn;
265         /*
266          * Size is the hardest attribute to get.  The incremental cost of any
267          * other attribute is essentially zero.
268          */
269         if (flags)
270                 new_op->upcall.req.getattr.mask = ORANGEFS_ATTR_SYS_ALL_NOHINT;
271         else
272                 new_op->upcall.req.getattr.mask =
273                     ORANGEFS_ATTR_SYS_ALL_NOHINT & ~ORANGEFS_ATTR_SYS_SIZE;
274 
275         ret = service_operation(new_op, __func__,
276             get_interruptible_flag(inode));
277         if (ret != 0)
278                 goto out;
279 
280 again2:
281         spin_lock(&inode->i_lock);
282         /* Must have all the attributes in the mask and be within cache time. */
283         if ((!flags && time_before(jiffies, orangefs_inode->getattr_time)) ||
284             orangefs_inode->attr_valid || inode->i_state & I_DIRTY_PAGES) {
285                 if (orangefs_inode->attr_valid) {
286                         spin_unlock(&inode->i_lock);
287                         write_inode_now(inode, 1);
288                         goto again2;
289                 }
290                 if (inode->i_state & I_DIRTY_PAGES) {
291                         ret = 0;
292                         goto out_unlock;
293                 }
294                 gossip_debug(GOSSIP_UTILS_DEBUG, "%s: in cache or dirty\n",
295                     __func__);
296                 ret = 0;
297                 goto out_unlock;
298         }
299 
300         if (!(flags & ORANGEFS_GETATTR_NEW)) {
301                 ret = orangefs_inode_is_stale(inode,
302                     &new_op->downcall.resp.getattr.attributes,
303                     new_op->downcall.resp.getattr.link_target);
304                 if (ret) {
305                         ret = -ESTALE;
306                         goto out_unlock;
307                 }
308         }
309 
310         type = orangefs_inode_type(new_op->
311             downcall.resp.getattr.attributes.objtype);
312         switch (type) {
313         case S_IFREG:
314                 inode->i_flags = orangefs_inode_flags(&new_op->
315                     downcall.resp.getattr.attributes);
316                 if (flags) {
317                         inode_size = (loff_t)new_op->
318                             downcall.resp.getattr.attributes.size;
319                         inode->i_size = inode_size;
320                         inode->i_blkbits = ffs(new_op->downcall.resp.getattr.
321                             attributes.blksize);
322                         inode->i_bytes = inode_size;
323                         inode->i_blocks =
324                             (inode_size + 512 - inode_size % 512)/512;
325                 }
326                 break;
327         case S_IFDIR:
328                 if (flags) {
329                         inode->i_size = PAGE_SIZE;
330                         inode_set_bytes(inode, inode->i_size);
331                 }
332                 set_nlink(inode, 1);
333                 break;
334         case S_IFLNK:
335                 if (flags & ORANGEFS_GETATTR_NEW) {
336                         inode->i_size = (loff_t)strlen(new_op->
337                             downcall.resp.getattr.link_target);
338                         ret = strscpy(orangefs_inode->link_target,
339                             new_op->downcall.resp.getattr.link_target,
340                             ORANGEFS_NAME_MAX);
341                         if (ret == -E2BIG) {
342                                 ret = -EIO;
343                                 goto out_unlock;
344                         }
345                         inode->i_link = orangefs_inode->link_target;
346                 }
347                 break;
348         /* i.e. -1 */
349         default:
350                 /* XXX: ESTALE?  This is what is done if it is not new. */
351                 orangefs_make_bad_inode(inode);
352                 ret = -ESTALE;
353                 goto out_unlock;
354         }
355 
356         inode->i_uid = make_kuid(&init_user_ns, new_op->
357             downcall.resp.getattr.attributes.owner);
358         inode->i_gid = make_kgid(&init_user_ns, new_op->
359             downcall.resp.getattr.attributes.group);
360         inode->i_atime.tv_sec = (time64_t)new_op->
361             downcall.resp.getattr.attributes.atime;
362         inode->i_mtime.tv_sec = (time64_t)new_op->
363             downcall.resp.getattr.attributes.mtime;
364         inode->i_ctime.tv_sec = (time64_t)new_op->
365             downcall.resp.getattr.attributes.ctime;
366         inode->i_atime.tv_nsec = 0;
367         inode->i_mtime.tv_nsec = 0;
368         inode->i_ctime.tv_nsec = 0;
369 
370         /* special case: mark the root inode as sticky */
371         inode->i_mode = type | (is_root_handle(inode) ? S_ISVTX : 0) |
372             orangefs_inode_perms(&new_op->downcall.resp.getattr.attributes);
373 
374         orangefs_inode->getattr_time = jiffies +
375             orangefs_getattr_timeout_msecs*HZ/1000;
376         ret = 0;
377 out_unlock:
378         spin_unlock(&inode->i_lock);
379 out:
380         op_release(new_op);
381         return ret;
382 }
383 
384 int orangefs_inode_check_changed(struct inode *inode)
385 {
386         struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
387         struct orangefs_kernel_op_s *new_op;
388         int ret;
389 
390         gossip_debug(GOSSIP_UTILS_DEBUG, "%s: called on inode %pU\n", __func__,
391             get_khandle_from_ino(inode));
392 
393         new_op = op_alloc(ORANGEFS_VFS_OP_GETATTR);
394         if (!new_op)
395                 return -ENOMEM;
396         new_op->upcall.req.getattr.refn = orangefs_inode->refn;
397         new_op->upcall.req.getattr.mask = ORANGEFS_ATTR_SYS_TYPE |
398             ORANGEFS_ATTR_SYS_LNK_TARGET;
399 
400         ret = service_operation(new_op, __func__,
401             get_interruptible_flag(inode));
402         if (ret != 0)
403                 goto out;
404 
405         ret = orangefs_inode_is_stale(inode,
406             &new_op->downcall.resp.getattr.attributes,
407             new_op->downcall.resp.getattr.link_target);
408 out:
409         op_release(new_op);
410         return ret;
411 }
412 
413 /*
414  * issues a orangefs setattr request to make sure the new attribute values
415  * take effect if successful.  returns 0 on success; -errno otherwise
416  */
417 int orangefs_inode_setattr(struct inode *inode)
418 {
419         struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
420         struct orangefs_kernel_op_s *new_op;
421         int ret;
422 
423         new_op = op_alloc(ORANGEFS_VFS_OP_SETATTR);
424         if (!new_op)
425                 return -ENOMEM;
426 
427         spin_lock(&inode->i_lock);
428         new_op->upcall.uid = from_kuid(&init_user_ns, orangefs_inode->attr_uid);
429         new_op->upcall.gid = from_kgid(&init_user_ns, orangefs_inode->attr_gid);
430         new_op->upcall.req.setattr.refn = orangefs_inode->refn;
431         copy_attributes_from_inode(inode,
432             &new_op->upcall.req.setattr.attributes);
433         orangefs_inode->attr_valid = 0;
434         if (!new_op->upcall.req.setattr.attributes.mask) {
435                 spin_unlock(&inode->i_lock);
436                 op_release(new_op);
437                 return 0;
438         }
439         spin_unlock(&inode->i_lock);
440 
441         ret = service_operation(new_op, __func__,
442             get_interruptible_flag(inode) | ORANGEFS_OP_WRITEBACK);
443         gossip_debug(GOSSIP_UTILS_DEBUG,
444             "orangefs_inode_setattr: returning %d\n", ret);
445         if (ret)
446                 orangefs_make_bad_inode(inode);
447 
448         op_release(new_op);
449 
450         if (ret == 0)
451                 orangefs_inode->getattr_time = jiffies - 1;
452         return ret;
453 }
454 
455 /*
456  * The following is a very dirty hack that is now a permanent part of the
457  * ORANGEFS protocol. See protocol.h for more error definitions.
458  */
459 
460 /* The order matches include/orangefs-types.h in the OrangeFS source. */
461 static int PINT_errno_mapping[] = {
462         0, EPERM, ENOENT, EINTR, EIO, ENXIO, EBADF, EAGAIN, ENOMEM,
463         EFAULT, EBUSY, EEXIST, ENODEV, ENOTDIR, EISDIR, EINVAL, EMFILE,
464         EFBIG, ENOSPC, EROFS, EMLINK, EPIPE, EDEADLK, ENAMETOOLONG,
465         ENOLCK, ENOSYS, ENOTEMPTY, ELOOP, EWOULDBLOCK, ENOMSG, EUNATCH,
466         EBADR, EDEADLOCK, ENODATA, ETIME, ENONET, EREMOTE, ECOMM,
467         EPROTO, EBADMSG, EOVERFLOW, ERESTART, EMSGSIZE, EPROTOTYPE,
468         ENOPROTOOPT, EPROTONOSUPPORT, EOPNOTSUPP, EADDRINUSE,
469         EADDRNOTAVAIL, ENETDOWN, ENETUNREACH, ENETRESET, ENOBUFS,
470         ETIMEDOUT, ECONNREFUSED, EHOSTDOWN, EHOSTUNREACH, EALREADY,
471         EACCES, ECONNRESET, ERANGE
472 };
473 
474 int orangefs_normalize_to_errno(__s32 error_code)
475 {
476         __u32 i;
477 
478         /* Success */
479         if (error_code == 0) {
480                 return 0;
481         /*
482          * This shouldn't ever happen. If it does it should be fixed on the
483          * server.
484          */
485         } else if (error_code > 0) {
486                 gossip_err("orangefs: error status received.\n");
487                 gossip_err("orangefs: assuming error code is inverted.\n");
488                 error_code = -error_code;
489         }
490 
491         /*
492          * XXX: This is very bad since error codes from ORANGEFS may not be
493          * suitable for return into userspace.
494          */
495 
496         /*
497          * Convert ORANGEFS error values into errno values suitable for return
498          * from the kernel.
499          */
500         if ((-error_code) & ORANGEFS_NON_ERRNO_ERROR_BIT) {
501                 if (((-error_code) &
502                     (ORANGEFS_ERROR_NUMBER_BITS|ORANGEFS_NON_ERRNO_ERROR_BIT|
503                     ORANGEFS_ERROR_BIT)) == ORANGEFS_ECANCEL) {
504                         /*
505                          * cancellation error codes generally correspond to
506                          * a timeout from the client's perspective
507                          */
508                         error_code = -ETIMEDOUT;
509                 } else {
510                         /* assume a default error code */
511                         gossip_err("%s: bad error code :%d:.\n",
512                                 __func__,
513                                 error_code);
514                         error_code = -EINVAL;
515                 }
516 
517         /* Convert ORANGEFS encoded errno values into regular errno values. */
518         } else if ((-error_code) & ORANGEFS_ERROR_BIT) {
519                 i = (-error_code) & ~(ORANGEFS_ERROR_BIT|ORANGEFS_ERROR_CLASS_BITS);
520                 if (i < ARRAY_SIZE(PINT_errno_mapping))
521                         error_code = -PINT_errno_mapping[i];
522                 else
523                         error_code = -EINVAL;
524 
525         /*
526          * Only ORANGEFS protocol error codes should ever come here. Otherwise
527          * there is a bug somewhere.
528          */
529         } else {
530                 gossip_err("%s: unknown error code.\n", __func__);
531                 error_code = -EINVAL;
532         }
533         return error_code;
534 }
535 
536 #define NUM_MODES 11
537 __s32 ORANGEFS_util_translate_mode(int mode)
538 {
539         int ret = 0;
540         int i = 0;
541         static int modes[NUM_MODES] = {
542                 S_IXOTH, S_IWOTH, S_IROTH,
543                 S_IXGRP, S_IWGRP, S_IRGRP,
544                 S_IXUSR, S_IWUSR, S_IRUSR,
545                 S_ISGID, S_ISUID
546         };
547         static int orangefs_modes[NUM_MODES] = {
548                 ORANGEFS_O_EXECUTE, ORANGEFS_O_WRITE, ORANGEFS_O_READ,
549                 ORANGEFS_G_EXECUTE, ORANGEFS_G_WRITE, ORANGEFS_G_READ,
550                 ORANGEFS_U_EXECUTE, ORANGEFS_U_WRITE, ORANGEFS_U_READ,
551                 ORANGEFS_G_SGID, ORANGEFS_U_SUID
552         };
553 
554         for (i = 0; i < NUM_MODES; i++)
555                 if (mode & modes[i])
556                         ret |= orangefs_modes[i];
557 
558         return ret;
559 }
560 #undef NUM_MODES
561 

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