1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * (C) 2001 Clemson University and The University of Chicago
4 *
5 * See COPYING in top-level directory.
6 */
7
8 /*
9 * The ORANGEFS Linux kernel support allows ORANGEFS volumes to be mounted and
10 * accessed through the Linux VFS (i.e. using standard I/O system calls).
11 * This support is only needed on clients that wish to mount the file system.
12 *
13 */
14
15 /*
16 * Declarations and macros for the ORANGEFS Linux kernel support.
17 */
18
19 #ifndef __ORANGEFSKERNEL_H
20 #define __ORANGEFSKERNEL_H
21
22 #include <linux/kernel.h>
23 #include <linux/moduleparam.h>
24 #include <linux/statfs.h>
25 #include <linux/backing-dev.h>
26 #include <linux/device.h>
27 #include <linux/mpage.h>
28 #include <linux/namei.h>
29 #include <linux/errno.h>
30 #include <linux/init.h>
31 #include <linux/module.h>
32 #include <linux/slab.h>
33 #include <linux/types.h>
34 #include <linux/fs.h>
35 #include <linux/vmalloc.h>
36
37 #include <linux/aio.h>
38 #include <linux/posix_acl.h>
39 #include <linux/posix_acl_xattr.h>
40 #include <linux/compat.h>
41 #include <linux/mount.h>
42 #include <linux/uaccess.h>
43 #include <linux/atomic.h>
44 #include <linux/uio.h>
45 #include <linux/sched/signal.h>
46 #include <linux/mm.h>
47 #include <linux/wait.h>
48 #include <linux/dcache.h>
49 #include <linux/pagemap.h>
50 #include <linux/poll.h>
51 #include <linux/rwsem.h>
52 #include <linux/xattr.h>
53 #include <linux/exportfs.h>
54 #include <linux/hashtable.h>
55
56 #include <asm/unaligned.h>
57
58 #include "orangefs-dev-proto.h"
59
60 #define ORANGEFS_DEFAULT_OP_TIMEOUT_SECS 20
61
62 #define ORANGEFS_BUFMAP_WAIT_TIMEOUT_SECS 30
63
64 #define ORANGEFS_DEFAULT_SLOT_TIMEOUT_SECS 900 /* 15 minutes */
65
66 #define ORANGEFS_REQDEVICE_NAME "pvfs2-req"
67
68 #define ORANGEFS_DEVREQ_MAGIC 0x20030529
69 #define ORANGEFS_PURGE_RETRY_COUNT 0x00000005
70
71 #define MAX_DEV_REQ_UPSIZE (2 * sizeof(__s32) + \
72 sizeof(__u64) + sizeof(struct orangefs_upcall_s))
73 #define MAX_DEV_REQ_DOWNSIZE (2 * sizeof(__s32) + \
74 sizeof(__u64) + sizeof(struct orangefs_downcall_s))
75
76 /*
77 * valid orangefs kernel operation states
78 *
79 * unknown - op was just initialized
80 * waiting - op is on request_list (upward bound)
81 * inprogr - op is in progress (waiting for downcall)
82 * serviced - op has matching downcall; ok
83 * purged - op has to start a timer since client-core
84 * exited uncleanly before servicing op
85 * given up - submitter has given up waiting for it
86 */
87 enum orangefs_vfs_op_states {
88 OP_VFS_STATE_UNKNOWN = 0,
89 OP_VFS_STATE_WAITING = 1,
90 OP_VFS_STATE_INPROGR = 2,
91 OP_VFS_STATE_SERVICED = 4,
92 OP_VFS_STATE_PURGED = 8,
93 OP_VFS_STATE_GIVEN_UP = 16,
94 };
95
96 /*
97 * orangefs kernel memory related flags
98 */
99
100 #if (defined CONFIG_DEBUG_SLAB)
101 #define ORANGEFS_CACHE_CREATE_FLAGS SLAB_RED_ZONE
102 #else
103 #define ORANGEFS_CACHE_CREATE_FLAGS 0
104 #endif
105
106 extern int orangefs_init_acl(struct inode *inode, struct inode *dir);
107 extern const struct xattr_handler *orangefs_xattr_handlers[];
108
109 extern struct posix_acl *orangefs_get_acl(struct inode *inode, int type, bool rcu);
110 extern int orangefs_set_acl(struct user_namespace *mnt_userns,
111 struct inode *inode, struct posix_acl *acl,
112 int type);
113
114 /*
115 * orangefs data structures
116 */
117 struct orangefs_kernel_op_s {
118 enum orangefs_vfs_op_states op_state;
119 __u64 tag;
120
121 /*
122 * Set uses_shared_memory to non zero if this operation uses
123 * shared memory. If true, then a retry on the op must also
124 * get a new shared memory buffer and re-populate it.
125 * Cancels don't care - it only matters for service_operation()
126 * retry logics and cancels don't go through it anymore. It
127 * safely stays non-zero when we use it as slot_to_free.
128 */
129 union {
130 int uses_shared_memory;
131 int slot_to_free;
132 };
133
134 struct orangefs_upcall_s upcall;
135 struct orangefs_downcall_s downcall;
136
137 struct completion waitq;
138 spinlock_t lock;
139
140 int attempts;
141
142 struct list_head list;
143 };
144
145 #define set_op_state_waiting(op) ((op)->op_state = OP_VFS_STATE_WAITING)
146 #define set_op_state_inprogress(op) ((op)->op_state = OP_VFS_STATE_INPROGR)
147 #define set_op_state_given_up(op) ((op)->op_state = OP_VFS_STATE_GIVEN_UP)
set_op_state_serviced(struct orangefs_kernel_op_s * op)148 static inline void set_op_state_serviced(struct orangefs_kernel_op_s *op)
149 {
150 op->op_state = OP_VFS_STATE_SERVICED;
151 complete(&op->waitq);
152 }
153
154 #define op_state_waiting(op) ((op)->op_state & OP_VFS_STATE_WAITING)
155 #define op_state_in_progress(op) ((op)->op_state & OP_VFS_STATE_INPROGR)
156 #define op_state_serviced(op) ((op)->op_state & OP_VFS_STATE_SERVICED)
157 #define op_state_purged(op) ((op)->op_state & OP_VFS_STATE_PURGED)
158 #define op_state_given_up(op) ((op)->op_state & OP_VFS_STATE_GIVEN_UP)
159 #define op_is_cancel(op) ((op)->upcall.type == ORANGEFS_VFS_OP_CANCEL)
160
161 void op_release(struct orangefs_kernel_op_s *op);
162
163 extern void orangefs_bufmap_put(int);
put_cancel(struct orangefs_kernel_op_s * op)164 static inline void put_cancel(struct orangefs_kernel_op_s *op)
165 {
166 orangefs_bufmap_put(op->slot_to_free);
167 op_release(op);
168 }
169
set_op_state_purged(struct orangefs_kernel_op_s * op)170 static inline void set_op_state_purged(struct orangefs_kernel_op_s *op)
171 {
172 spin_lock(&op->lock);
173 if (unlikely(op_is_cancel(op))) {
174 list_del_init(&op->list);
175 spin_unlock(&op->lock);
176 put_cancel(op);
177 } else {
178 op->op_state |= OP_VFS_STATE_PURGED;
179 complete(&op->waitq);
180 spin_unlock(&op->lock);
181 }
182 }
183
184 /* per inode private orangefs info */
185 struct orangefs_inode_s {
186 struct orangefs_object_kref refn;
187 char link_target[ORANGEFS_NAME_MAX];
188 /*
189 * Reading/Writing Extended attributes need to acquire the appropriate
190 * reader/writer semaphore on the orangefs_inode_s structure.
191 */
192 struct rw_semaphore xattr_sem;
193
194 struct inode vfs_inode;
195 sector_t last_failed_block_index_read;
196
197 unsigned long getattr_time;
198 unsigned long mapping_time;
199 int attr_valid;
200 kuid_t attr_uid;
201 kgid_t attr_gid;
202 unsigned long bitlock;
203
204 DECLARE_HASHTABLE(xattr_cache, 4);
205 };
206
207 /* per superblock private orangefs info */
208 struct orangefs_sb_info_s {
209 struct orangefs_khandle root_khandle;
210 __s32 fs_id;
211 int id;
212 int flags;
213 #define ORANGEFS_OPT_INTR 0x01
214 #define ORANGEFS_OPT_LOCAL_LOCK 0x02
215 char devname[ORANGEFS_MAX_SERVER_ADDR_LEN];
216 struct super_block *sb;
217 int mount_pending;
218 int no_list;
219 struct list_head list;
220 };
221
222 struct orangefs_stats {
223 unsigned long cache_hits;
224 unsigned long cache_misses;
225 unsigned long reads;
226 unsigned long writes;
227 };
228
229 struct orangefs_cached_xattr {
230 struct hlist_node node;
231 char key[ORANGEFS_MAX_XATTR_NAMELEN];
232 char val[ORANGEFS_MAX_XATTR_VALUELEN];
233 ssize_t length;
234 unsigned long timeout;
235 };
236
237 struct orangefs_write_range {
238 loff_t pos;
239 size_t len;
240 kuid_t uid;
241 kgid_t gid;
242 };
243
244 extern struct orangefs_stats orangefs_stats;
245
246 /*
247 * NOTE: See Documentation/filesystems/porting.rst for information
248 * on implementing FOO_I and properly accessing fs private data
249 */
ORANGEFS_I(struct inode * inode)250 static inline struct orangefs_inode_s *ORANGEFS_I(struct inode *inode)
251 {
252 return container_of(inode, struct orangefs_inode_s, vfs_inode);
253 }
254
ORANGEFS_SB(struct super_block * sb)255 static inline struct orangefs_sb_info_s *ORANGEFS_SB(struct super_block *sb)
256 {
257 return (struct orangefs_sb_info_s *) sb->s_fs_info;
258 }
259
260 /* ino_t descends from "unsigned long", 8 bytes, 64 bits. */
orangefs_khandle_to_ino(struct orangefs_khandle * khandle)261 static inline ino_t orangefs_khandle_to_ino(struct orangefs_khandle *khandle)
262 {
263 union {
264 unsigned char u[8];
265 __u64 ino;
266 } ihandle;
267
268 ihandle.u[0] = khandle->u[0] ^ khandle->u[4];
269 ihandle.u[1] = khandle->u[1] ^ khandle->u[5];
270 ihandle.u[2] = khandle->u[2] ^ khandle->u[6];
271 ihandle.u[3] = khandle->u[3] ^ khandle->u[7];
272 ihandle.u[4] = khandle->u[12] ^ khandle->u[8];
273 ihandle.u[5] = khandle->u[13] ^ khandle->u[9];
274 ihandle.u[6] = khandle->u[14] ^ khandle->u[10];
275 ihandle.u[7] = khandle->u[15] ^ khandle->u[11];
276
277 return ihandle.ino;
278 }
279
get_khandle_from_ino(struct inode * inode)280 static inline struct orangefs_khandle *get_khandle_from_ino(struct inode *inode)
281 {
282 return &(ORANGEFS_I(inode)->refn.khandle);
283 }
284
is_root_handle(struct inode * inode)285 static inline int is_root_handle(struct inode *inode)
286 {
287 gossip_debug(GOSSIP_DCACHE_DEBUG,
288 "%s: root handle: %pU, this handle: %pU:\n",
289 __func__,
290 &ORANGEFS_SB(inode->i_sb)->root_khandle,
291 get_khandle_from_ino(inode));
292
293 if (ORANGEFS_khandle_cmp(&(ORANGEFS_SB(inode->i_sb)->root_khandle),
294 get_khandle_from_ino(inode)))
295 return 0;
296 else
297 return 1;
298 }
299
match_handle(struct orangefs_khandle resp_handle,struct inode * inode)300 static inline int match_handle(struct orangefs_khandle resp_handle,
301 struct inode *inode)
302 {
303 gossip_debug(GOSSIP_DCACHE_DEBUG,
304 "%s: one handle: %pU, another handle:%pU:\n",
305 __func__,
306 &resp_handle,
307 get_khandle_from_ino(inode));
308
309 if (ORANGEFS_khandle_cmp(&resp_handle, get_khandle_from_ino(inode)))
310 return 0;
311 else
312 return 1;
313 }
314
315 /*
316 * defined in orangefs-cache.c
317 */
318 int op_cache_initialize(void);
319 int op_cache_finalize(void);
320 struct orangefs_kernel_op_s *op_alloc(__s32 type);
321 void orangefs_new_tag(struct orangefs_kernel_op_s *op);
322 char *get_opname_string(struct orangefs_kernel_op_s *new_op);
323
324 int orangefs_inode_cache_initialize(void);
325 int orangefs_inode_cache_finalize(void);
326
327 /*
328 * defined in orangefs-mod.c
329 */
330 void purge_inprogress_ops(void);
331
332 /*
333 * defined in waitqueue.c
334 */
335 void purge_waiting_ops(void);
336
337 /*
338 * defined in super.c
339 */
340 extern uint64_t orangefs_features;
341
342 struct dentry *orangefs_mount(struct file_system_type *fst,
343 int flags,
344 const char *devname,
345 void *data);
346
347 void orangefs_kill_sb(struct super_block *sb);
348 int orangefs_remount(struct orangefs_sb_info_s *);
349
350 int fsid_key_table_initialize(void);
351 void fsid_key_table_finalize(void);
352
353 /*
354 * defined in inode.c
355 */
356 vm_fault_t orangefs_page_mkwrite(struct vm_fault *);
357 struct inode *orangefs_new_inode(struct super_block *sb,
358 struct inode *dir,
359 int mode,
360 dev_t dev,
361 struct orangefs_object_kref *ref);
362
363 int __orangefs_setattr(struct inode *, struct iattr *);
364 int orangefs_setattr(struct user_namespace *, struct dentry *, struct iattr *);
365
366 int orangefs_getattr(struct user_namespace *mnt_userns, const struct path *path,
367 struct kstat *stat, u32 request_mask, unsigned int flags);
368
369 int orangefs_permission(struct user_namespace *mnt_userns,
370 struct inode *inode, int mask);
371
372 int orangefs_update_time(struct inode *, struct timespec64 *, int);
373
374 /*
375 * defined in xattr.c
376 */
377 ssize_t orangefs_listxattr(struct dentry *dentry, char *buffer, size_t size);
378
379 /*
380 * defined in namei.c
381 */
382 struct inode *orangefs_iget(struct super_block *sb,
383 struct orangefs_object_kref *ref);
384
385 /*
386 * defined in devorangefs-req.c
387 */
388 extern uint32_t orangefs_userspace_version;
389
390 int orangefs_dev_init(void);
391 void orangefs_dev_cleanup(void);
392 int is_daemon_in_service(void);
393 bool __is_daemon_in_service(void);
394
395 /*
396 * defined in file.c
397 */
398 int orangefs_revalidate_mapping(struct inode *);
399 ssize_t wait_for_direct_io(enum ORANGEFS_io_type, struct inode *, loff_t *,
400 struct iov_iter *, size_t, loff_t, struct orangefs_write_range *, int *,
401 struct file *);
402 ssize_t do_readv_writev(enum ORANGEFS_io_type, struct file *, loff_t *,
403 struct iov_iter *);
404
405 /*
406 * defined in orangefs-utils.c
407 */
408 __s32 fsid_of_op(struct orangefs_kernel_op_s *op);
409
410 ssize_t orangefs_inode_getxattr(struct inode *inode,
411 const char *name,
412 void *buffer,
413 size_t size);
414
415 int orangefs_inode_setxattr(struct inode *inode,
416 const char *name,
417 const void *value,
418 size_t size,
419 int flags);
420
421 #define ORANGEFS_GETATTR_NEW 1
422 #define ORANGEFS_GETATTR_SIZE 2
423
424 int orangefs_inode_getattr(struct inode *, int);
425
426 int orangefs_inode_check_changed(struct inode *inode);
427
428 int orangefs_inode_setattr(struct inode *inode);
429
430 bool orangefs_cancel_op_in_progress(struct orangefs_kernel_op_s *op);
431
432 int orangefs_normalize_to_errno(__s32 error_code);
433
434 extern struct mutex orangefs_request_mutex;
435 extern int op_timeout_secs;
436 extern int slot_timeout_secs;
437 extern int orangefs_cache_timeout_msecs;
438 extern int orangefs_dcache_timeout_msecs;
439 extern int orangefs_getattr_timeout_msecs;
440 extern struct list_head orangefs_superblocks;
441 extern spinlock_t orangefs_superblocks_lock;
442 extern struct list_head orangefs_request_list;
443 extern spinlock_t orangefs_request_list_lock;
444 extern wait_queue_head_t orangefs_request_list_waitq;
445 extern struct list_head *orangefs_htable_ops_in_progress;
446 extern spinlock_t orangefs_htable_ops_in_progress_lock;
447 extern int hash_table_size;
448
449 extern const struct file_operations orangefs_file_operations;
450 extern const struct inode_operations orangefs_symlink_inode_operations;
451 extern const struct inode_operations orangefs_dir_inode_operations;
452 extern const struct file_operations orangefs_dir_operations;
453 extern const struct dentry_operations orangefs_dentry_operations;
454
455 /*
456 * misc convenience macros
457 */
458
459 #define ORANGEFS_OP_INTERRUPTIBLE 1 /* service_operation() is interruptible */
460 #define ORANGEFS_OP_PRIORITY 2 /* service_operation() is high priority */
461 #define ORANGEFS_OP_CANCELLATION 4 /* this is a cancellation */
462 #define ORANGEFS_OP_NO_MUTEX 8 /* don't acquire request_mutex */
463 #define ORANGEFS_OP_ASYNC 16 /* Queue it, but don't wait */
464 #define ORANGEFS_OP_WRITEBACK 32
465
466 int service_operation(struct orangefs_kernel_op_s *op,
467 const char *op_name,
468 int flags);
469
470 #define get_interruptible_flag(inode) \
471 ((ORANGEFS_SB(inode->i_sb)->flags & ORANGEFS_OPT_INTR) ? \
472 ORANGEFS_OP_INTERRUPTIBLE : 0)
473
474 #define fill_default_sys_attrs(sys_attr, type, mode) \
475 do { \
476 sys_attr.owner = from_kuid(&init_user_ns, current_fsuid()); \
477 sys_attr.group = from_kgid(&init_user_ns, current_fsgid()); \
478 sys_attr.perms = ORANGEFS_util_translate_mode(mode); \
479 sys_attr.mtime = 0; \
480 sys_attr.atime = 0; \
481 sys_attr.ctime = 0; \
482 sys_attr.mask = ORANGEFS_ATTR_SYS_ALL_SETABLE; \
483 } while (0)
484
orangefs_set_timeout(struct dentry * dentry)485 static inline void orangefs_set_timeout(struct dentry *dentry)
486 {
487 unsigned long time = jiffies + orangefs_dcache_timeout_msecs*HZ/1000;
488
489 dentry->d_fsdata = (void *) time;
490 }
491
492 #endif /* __ORANGEFSKERNEL_H */
493