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 const struct xattr_handler *orangefs_xattr_handlers[];
107 
108 extern struct posix_acl *orangefs_get_acl(struct inode *inode, int type, bool rcu);
109 extern int orangefs_set_acl(struct mnt_idmap *idmap,
110 			    struct dentry *dentry, struct posix_acl *acl,
111 			    int type);
112 int __orangefs_set_acl(struct inode *inode, struct posix_acl *acl, 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 			      umode_t mode,
360 			      dev_t dev,
361 			      struct orangefs_object_kref *ref);
362 
363 int __orangefs_setattr(struct inode *, struct iattr *);
364 int __orangefs_setattr_mode(struct dentry *dentry, struct iattr *iattr);
365 int orangefs_setattr(struct mnt_idmap *, struct dentry *, struct iattr *);
366 
367 int orangefs_getattr(struct mnt_idmap *idmap, const struct path *path,
368 		     struct kstat *stat, u32 request_mask, unsigned int flags);
369 
370 int orangefs_permission(struct mnt_idmap *idmap,
371 			struct inode *inode, int mask);
372 
373 int orangefs_update_time(struct inode *, struct timespec64 *, int);
374 
375 /*
376  * defined in xattr.c
377  */
378 ssize_t orangefs_listxattr(struct dentry *dentry, char *buffer, size_t size);
379 
380 /*
381  * defined in namei.c
382  */
383 struct inode *orangefs_iget(struct super_block *sb,
384 			 struct orangefs_object_kref *ref);
385 
386 /*
387  * defined in devorangefs-req.c
388  */
389 extern uint32_t orangefs_userspace_version;
390 
391 int orangefs_dev_init(void);
392 void orangefs_dev_cleanup(void);
393 int is_daemon_in_service(void);
394 bool __is_daemon_in_service(void);
395 
396 /*
397  * defined in file.c
398  */
399 int orangefs_revalidate_mapping(struct inode *);
400 ssize_t wait_for_direct_io(enum ORANGEFS_io_type, struct inode *, loff_t *,
401     struct iov_iter *, size_t, loff_t, struct orangefs_write_range *, int *,
402     struct file *);
403 ssize_t do_readv_writev(enum ORANGEFS_io_type, struct file *, loff_t *,
404     struct iov_iter *);
405 
406 /*
407  * defined in orangefs-utils.c
408  */
409 __s32 fsid_of_op(struct orangefs_kernel_op_s *op);
410 
411 ssize_t orangefs_inode_getxattr(struct inode *inode,
412 			     const char *name,
413 			     void *buffer,
414 			     size_t size);
415 
416 int orangefs_inode_setxattr(struct inode *inode,
417 			 const char *name,
418 			 const void *value,
419 			 size_t size,
420 			 int flags);
421 
422 #define ORANGEFS_GETATTR_NEW 1
423 #define ORANGEFS_GETATTR_SIZE 2
424 
425 int orangefs_inode_getattr(struct inode *, int);
426 
427 int orangefs_inode_check_changed(struct inode *inode);
428 
429 int orangefs_inode_setattr(struct inode *inode);
430 
431 bool orangefs_cancel_op_in_progress(struct orangefs_kernel_op_s *op);
432 
433 int orangefs_normalize_to_errno(__s32 error_code);
434 
435 extern struct mutex orangefs_request_mutex;
436 extern int op_timeout_secs;
437 extern int slot_timeout_secs;
438 extern int orangefs_cache_timeout_msecs;
439 extern int orangefs_dcache_timeout_msecs;
440 extern int orangefs_getattr_timeout_msecs;
441 extern struct list_head orangefs_superblocks;
442 extern spinlock_t orangefs_superblocks_lock;
443 extern struct list_head orangefs_request_list;
444 extern spinlock_t orangefs_request_list_lock;
445 extern wait_queue_head_t orangefs_request_list_waitq;
446 extern struct list_head *orangefs_htable_ops_in_progress;
447 extern spinlock_t orangefs_htable_ops_in_progress_lock;
448 extern int hash_table_size;
449 
450 extern const struct file_operations orangefs_file_operations;
451 extern const struct inode_operations orangefs_symlink_inode_operations;
452 extern const struct inode_operations orangefs_dir_inode_operations;
453 extern const struct file_operations orangefs_dir_operations;
454 extern const struct dentry_operations orangefs_dentry_operations;
455 
456 /*
457  * misc convenience macros
458  */
459 
460 #define ORANGEFS_OP_INTERRUPTIBLE 1   /* service_operation() is interruptible */
461 #define ORANGEFS_OP_PRIORITY      2   /* service_operation() is high priority */
462 #define ORANGEFS_OP_CANCELLATION  4   /* this is a cancellation */
463 #define ORANGEFS_OP_NO_MUTEX      8   /* don't acquire request_mutex */
464 #define ORANGEFS_OP_ASYNC         16  /* Queue it, but don't wait */
465 #define ORANGEFS_OP_WRITEBACK     32
466 
467 int service_operation(struct orangefs_kernel_op_s *op,
468 		      const char *op_name,
469 		      int flags);
470 
471 #define get_interruptible_flag(inode) \
472 	((ORANGEFS_SB(inode->i_sb)->flags & ORANGEFS_OPT_INTR) ? \
473 		ORANGEFS_OP_INTERRUPTIBLE : 0)
474 
475 #define fill_default_sys_attrs(sys_attr, type, mode)			\
476 do {									\
477 	sys_attr.owner = from_kuid(&init_user_ns, current_fsuid()); \
478 	sys_attr.group = from_kgid(&init_user_ns, current_fsgid()); \
479 	sys_attr.perms = ORANGEFS_util_translate_mode(mode);		\
480 	sys_attr.mtime = 0;						\
481 	sys_attr.atime = 0;						\
482 	sys_attr.ctime = 0;						\
483 	sys_attr.mask = ORANGEFS_ATTR_SYS_ALL_SETABLE;			\
484 } while (0)
485 
orangefs_set_timeout(struct dentry * dentry)486 static inline void orangefs_set_timeout(struct dentry *dentry)
487 {
488 	unsigned long time = jiffies + orangefs_dcache_timeout_msecs*HZ/1000;
489 
490 	dentry->d_fsdata = (void *) time;
491 }
492 
493 #endif /* __ORANGEFSKERNEL_H */
494