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Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
3d14c5d2 | 2 | #include <linux/ceph/ceph_debug.h> |
40819f6f GF |
3 | |
4 | #include <linux/file.h> | |
5 | #include <linux/namei.h> | |
eb13e832 | 6 | #include <linux/random.h> |
40819f6f GF |
7 | |
8 | #include "super.h" | |
9 | #include "mds_client.h" | |
3d14c5d2 | 10 | #include <linux/ceph/pagelist.h> |
40819f6f | 11 | |
eb13e832 | 12 | static u64 lock_secret; |
9280be24 YZ |
13 | static int ceph_lock_wait_for_completion(struct ceph_mds_client *mdsc, |
14 | struct ceph_mds_request *req); | |
eb13e832 YZ |
15 | |
16 | static inline u64 secure_addr(void *addr) | |
17 | { | |
18 | u64 v = lock_secret ^ (u64)(unsigned long)addr; | |
19 | /* | |
20 | * Set the most significant bit, so that MDS knows the 'owner' | |
21 | * is sufficient to identify the owner of lock. (old code uses | |
22 | * both 'owner' and 'pid') | |
23 | */ | |
24 | v |= (1ULL << 63); | |
25 | return v; | |
26 | } | |
27 | ||
28 | void __init ceph_flock_init(void) | |
29 | { | |
30 | get_random_bytes(&lock_secret, sizeof(lock_secret)); | |
31 | } | |
32 | ||
89aa5930 YZ |
33 | static void ceph_fl_copy_lock(struct file_lock *dst, struct file_lock *src) |
34 | { | |
ff5d913d YZ |
35 | struct ceph_file_info *fi = dst->fl_file->private_data; |
36 | struct inode *inode = file_inode(dst->fl_file); | |
89aa5930 | 37 | atomic_inc(&ceph_inode(inode)->i_filelock_ref); |
ff5d913d | 38 | atomic_inc(&fi->num_locks); |
89aa5930 YZ |
39 | } |
40 | ||
41 | static void ceph_fl_release_lock(struct file_lock *fl) | |
42 | { | |
ff5d913d | 43 | struct ceph_file_info *fi = fl->fl_file->private_data; |
89aa5930 | 44 | struct inode *inode = file_inode(fl->fl_file); |
b3f8d68f | 45 | struct ceph_inode_info *ci = ceph_inode(inode); |
ff5d913d | 46 | atomic_dec(&fi->num_locks); |
b3f8d68f YZ |
47 | if (atomic_dec_and_test(&ci->i_filelock_ref)) { |
48 | /* clear error when all locks are released */ | |
49 | spin_lock(&ci->i_ceph_lock); | |
50 | ci->i_ceph_flags &= ~CEPH_I_ERROR_FILELOCK; | |
51 | spin_unlock(&ci->i_ceph_lock); | |
52 | } | |
89aa5930 YZ |
53 | } |
54 | ||
55 | static const struct file_lock_operations ceph_fl_lock_ops = { | |
56 | .fl_copy_lock = ceph_fl_copy_lock, | |
57 | .fl_release_private = ceph_fl_release_lock, | |
58 | }; | |
59 | ||
06a1ad43 | 60 | /* |
40819f6f GF |
61 | * Implement fcntl and flock locking functions. |
62 | */ | |
89aa5930 | 63 | static int ceph_lock_message(u8 lock_type, u16 operation, struct inode *inode, |
637ae8d5 | 64 | int cmd, u8 wait, struct file_lock *fl) |
40819f6f | 65 | { |
2678da88 | 66 | struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb); |
40819f6f GF |
67 | struct ceph_mds_request *req; |
68 | int err; | |
637ae8d5 | 69 | u64 length = 0; |
eb13e832 | 70 | u64 owner; |
40819f6f | 71 | |
89aa5930 YZ |
72 | if (operation == CEPH_MDS_OP_SETFILELOCK) { |
73 | /* | |
74 | * increasing i_filelock_ref closes race window between | |
75 | * handling request reply and adding file_lock struct to | |
76 | * inode. Otherwise, auth caps may get trimmed in the | |
77 | * window. Caller function will decrease the counter. | |
78 | */ | |
79 | fl->fl_ops = &ceph_fl_lock_ops; | |
ff5d913d | 80 | fl->fl_ops->fl_copy_lock(fl, NULL); |
89aa5930 YZ |
81 | } |
82 | ||
9280be24 YZ |
83 | if (operation != CEPH_MDS_OP_SETFILELOCK || cmd == CEPH_LOCK_UNLOCK) |
84 | wait = 0; | |
85 | ||
40819f6f GF |
86 | req = ceph_mdsc_create_request(mdsc, operation, USE_AUTH_MDS); |
87 | if (IS_ERR(req)) | |
88 | return PTR_ERR(req); | |
70b666c3 SW |
89 | req->r_inode = inode; |
90 | ihold(inode); | |
3bd58143 | 91 | req->r_num_caps = 1; |
40819f6f | 92 | |
637ae8d5 HS |
93 | /* mds requires start and length rather than start and end */ |
94 | if (LLONG_MAX == fl->fl_end) | |
95 | length = 0; | |
96 | else | |
97 | length = fl->fl_end - fl->fl_start + 1; | |
98 | ||
130d1f95 | 99 | owner = secure_addr(fl->fl_owner); |
eb13e832 YZ |
100 | |
101 | dout("ceph_lock_message: rule: %d, op: %d, owner: %llx, pid: %llu, " | |
4c069a58 | 102 | "start: %llu, length: %llu, wait: %d, type: %d\n", (int)lock_type, |
eb13e832 YZ |
103 | (int)operation, owner, (u64)fl->fl_pid, fl->fl_start, length, |
104 | wait, fl->fl_type); | |
637ae8d5 | 105 | |
40819f6f GF |
106 | req->r_args.filelock_change.rule = lock_type; |
107 | req->r_args.filelock_change.type = cmd; | |
eb13e832 | 108 | req->r_args.filelock_change.owner = cpu_to_le64(owner); |
637ae8d5 | 109 | req->r_args.filelock_change.pid = cpu_to_le64((u64)fl->fl_pid); |
637ae8d5 | 110 | req->r_args.filelock_change.start = cpu_to_le64(fl->fl_start); |
40819f6f GF |
111 | req->r_args.filelock_change.length = cpu_to_le64(length); |
112 | req->r_args.filelock_change.wait = wait; | |
113 | ||
9280be24 YZ |
114 | if (wait) |
115 | req->r_wait_for_completion = ceph_lock_wait_for_completion; | |
116 | ||
40819f6f | 117 | err = ceph_mdsc_do_request(mdsc, inode, req); |
28a28261 | 118 | if (!err && operation == CEPH_MDS_OP_GETFILELOCK) { |
9d5b86ac | 119 | fl->fl_pid = -le64_to_cpu(req->r_reply_info.filelock_reply->pid); |
a5b10629 HS |
120 | if (CEPH_LOCK_SHARED == req->r_reply_info.filelock_reply->type) |
121 | fl->fl_type = F_RDLCK; | |
122 | else if (CEPH_LOCK_EXCL == req->r_reply_info.filelock_reply->type) | |
123 | fl->fl_type = F_WRLCK; | |
124 | else | |
125 | fl->fl_type = F_UNLCK; | |
126 | ||
127 | fl->fl_start = le64_to_cpu(req->r_reply_info.filelock_reply->start); | |
128 | length = le64_to_cpu(req->r_reply_info.filelock_reply->start) + | |
129 | le64_to_cpu(req->r_reply_info.filelock_reply->length); | |
130 | if (length >= 1) | |
131 | fl->fl_end = length -1; | |
132 | else | |
133 | fl->fl_end = 0; | |
134 | ||
135 | } | |
40819f6f GF |
136 | ceph_mdsc_put_request(req); |
137 | dout("ceph_lock_message: rule: %d, op: %d, pid: %llu, start: %llu, " | |
4c069a58 | 138 | "length: %llu, wait: %d, type: %d, err code %d\n", (int)lock_type, |
637ae8d5 HS |
139 | (int)operation, (u64)fl->fl_pid, fl->fl_start, |
140 | length, wait, fl->fl_type, err); | |
40819f6f GF |
141 | return err; |
142 | } | |
143 | ||
9280be24 YZ |
144 | static int ceph_lock_wait_for_completion(struct ceph_mds_client *mdsc, |
145 | struct ceph_mds_request *req) | |
146 | { | |
147 | struct ceph_mds_request *intr_req; | |
148 | struct inode *inode = req->r_inode; | |
149 | int err, lock_type; | |
150 | ||
151 | BUG_ON(req->r_op != CEPH_MDS_OP_SETFILELOCK); | |
152 | if (req->r_args.filelock_change.rule == CEPH_LOCK_FCNTL) | |
153 | lock_type = CEPH_LOCK_FCNTL_INTR; | |
154 | else if (req->r_args.filelock_change.rule == CEPH_LOCK_FLOCK) | |
155 | lock_type = CEPH_LOCK_FLOCK_INTR; | |
156 | else | |
157 | BUG_ON(1); | |
158 | BUG_ON(req->r_args.filelock_change.type == CEPH_LOCK_UNLOCK); | |
159 | ||
160 | err = wait_for_completion_interruptible(&req->r_completion); | |
161 | if (!err) | |
162 | return 0; | |
163 | ||
164 | dout("ceph_lock_wait_for_completion: request %llu was interrupted\n", | |
165 | req->r_tid); | |
166 | ||
92e57e62 YZ |
167 | mutex_lock(&mdsc->mutex); |
168 | if (test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags)) { | |
169 | err = 0; | |
170 | } else { | |
171 | /* | |
172 | * ensure we aren't running concurrently with | |
173 | * ceph_fill_trace or ceph_readdir_prepopulate, which | |
174 | * rely on locks (dir mutex) held by our caller. | |
175 | */ | |
176 | mutex_lock(&req->r_fill_mutex); | |
177 | req->r_err = err; | |
178 | set_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags); | |
179 | mutex_unlock(&req->r_fill_mutex); | |
180 | ||
181 | if (!req->r_session) { | |
182 | // haven't sent the request | |
183 | err = 0; | |
184 | } | |
185 | } | |
186 | mutex_unlock(&mdsc->mutex); | |
187 | if (!err) | |
188 | return 0; | |
189 | ||
9280be24 YZ |
190 | intr_req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETFILELOCK, |
191 | USE_AUTH_MDS); | |
192 | if (IS_ERR(intr_req)) | |
193 | return PTR_ERR(intr_req); | |
194 | ||
195 | intr_req->r_inode = inode; | |
196 | ihold(inode); | |
197 | intr_req->r_num_caps = 1; | |
198 | ||
199 | intr_req->r_args.filelock_change = req->r_args.filelock_change; | |
200 | intr_req->r_args.filelock_change.rule = lock_type; | |
201 | intr_req->r_args.filelock_change.type = CEPH_LOCK_UNLOCK; | |
202 | ||
203 | err = ceph_mdsc_do_request(mdsc, inode, intr_req); | |
204 | ceph_mdsc_put_request(intr_req); | |
205 | ||
206 | if (err && err != -ERESTARTSYS) | |
207 | return err; | |
208 | ||
92e57e62 | 209 | wait_for_completion_killable(&req->r_safe_completion); |
9280be24 YZ |
210 | return 0; |
211 | } | |
212 | ||
bbb480ab YZ |
213 | static int try_unlock_file(struct file *file, struct file_lock *fl) |
214 | { | |
215 | int err; | |
216 | unsigned int orig_flags = fl->fl_flags; | |
217 | fl->fl_flags |= FL_EXISTS; | |
218 | err = locks_lock_file_wait(file, fl); | |
219 | fl->fl_flags = orig_flags; | |
220 | if (err == -ENOENT) { | |
221 | if (!(orig_flags & FL_EXISTS)) | |
222 | err = 0; | |
223 | return err; | |
224 | } | |
225 | return 1; | |
226 | } | |
227 | ||
06a1ad43 | 228 | /* |
40819f6f GF |
229 | * Attempt to set an fcntl lock. |
230 | * For now, this just goes away to the server. Later it may be more awesome. | |
231 | */ | |
232 | int ceph_lock(struct file *file, int cmd, struct file_lock *fl) | |
233 | { | |
89aa5930 | 234 | struct inode *inode = file_inode(file); |
b3f8d68f YZ |
235 | struct ceph_inode_info *ci = ceph_inode(inode); |
236 | int err = 0; | |
40819f6f | 237 | u16 op = CEPH_MDS_OP_SETFILELOCK; |
89aa5930 | 238 | u8 wait = 0; |
b3f8d68f | 239 | u8 lock_cmd; |
40819f6f | 240 | |
eb70c0ce YZ |
241 | if (!(fl->fl_flags & FL_POSIX)) |
242 | return -ENOLCK; | |
243 | /* No mandatory locks */ | |
244 | if (__mandatory_lock(file->f_mapping->host) && fl->fl_type != F_UNLCK) | |
245 | return -ENOLCK; | |
246 | ||
4c069a58 | 247 | dout("ceph_lock, fl_owner: %p\n", fl->fl_owner); |
40819f6f GF |
248 | |
249 | /* set wait bit as appropriate, then make command as Ceph expects it*/ | |
0e8e95d6 | 250 | if (IS_GETLK(cmd)) |
40819f6f | 251 | op = CEPH_MDS_OP_GETFILELOCK; |
0e8e95d6 YZ |
252 | else if (IS_SETLKW(cmd)) |
253 | wait = 1; | |
40819f6f | 254 | |
b3f8d68f YZ |
255 | spin_lock(&ci->i_ceph_lock); |
256 | if (ci->i_ceph_flags & CEPH_I_ERROR_FILELOCK) { | |
257 | err = -EIO; | |
b3f8d68f YZ |
258 | } |
259 | spin_unlock(&ci->i_ceph_lock); | |
260 | if (err < 0) { | |
261 | if (op == CEPH_MDS_OP_SETFILELOCK && F_UNLCK == fl->fl_type) | |
262 | posix_lock_file(file, fl, NULL); | |
263 | return err; | |
89aa5930 YZ |
264 | } |
265 | ||
40819f6f GF |
266 | if (F_RDLCK == fl->fl_type) |
267 | lock_cmd = CEPH_LOCK_SHARED; | |
268 | else if (F_WRLCK == fl->fl_type) | |
269 | lock_cmd = CEPH_LOCK_EXCL; | |
270 | else | |
271 | lock_cmd = CEPH_LOCK_UNLOCK; | |
272 | ||
bbb480ab YZ |
273 | if (op == CEPH_MDS_OP_SETFILELOCK && F_UNLCK == fl->fl_type) { |
274 | err = try_unlock_file(file, fl); | |
275 | if (err <= 0) | |
276 | return err; | |
277 | } | |
278 | ||
89aa5930 | 279 | err = ceph_lock_message(CEPH_LOCK_FCNTL, op, inode, lock_cmd, wait, fl); |
40819f6f | 280 | if (!err) { |
bbb480ab | 281 | if (op == CEPH_MDS_OP_SETFILELOCK && F_UNLCK != fl->fl_type) { |
4c069a58 | 282 | dout("mds locked, locking locally\n"); |
a5b10629 | 283 | err = posix_lock_file(file, fl, NULL); |
b3f8d68f | 284 | if (err) { |
0c1f91f2 SW |
285 | /* undo! This should only happen if |
286 | * the kernel detects local | |
287 | * deadlock. */ | |
89aa5930 | 288 | ceph_lock_message(CEPH_LOCK_FCNTL, op, inode, |
a5b10629 | 289 | CEPH_LOCK_UNLOCK, 0, fl); |
4c069a58 | 290 | dout("got %d on posix_lock_file, undid lock\n", |
0c1f91f2 | 291 | err); |
a5b10629 | 292 | } |
40819f6f | 293 | } |
40819f6f GF |
294 | } |
295 | return err; | |
296 | } | |
297 | ||
298 | int ceph_flock(struct file *file, int cmd, struct file_lock *fl) | |
299 | { | |
89aa5930 | 300 | struct inode *inode = file_inode(file); |
b3f8d68f YZ |
301 | struct ceph_inode_info *ci = ceph_inode(inode); |
302 | int err = 0; | |
0e8e95d6 | 303 | u8 wait = 0; |
b3f8d68f | 304 | u8 lock_cmd; |
40819f6f | 305 | |
eb70c0ce YZ |
306 | if (!(fl->fl_flags & FL_FLOCK)) |
307 | return -ENOLCK; | |
308 | /* No mandatory locks */ | |
db4a63aa YZ |
309 | if (fl->fl_type & LOCK_MAND) |
310 | return -EOPNOTSUPP; | |
eb70c0ce | 311 | |
4c069a58 | 312 | dout("ceph_flock, fl_file: %p\n", fl->fl_file); |
40819f6f | 313 | |
b3f8d68f YZ |
314 | spin_lock(&ci->i_ceph_lock); |
315 | if (ci->i_ceph_flags & CEPH_I_ERROR_FILELOCK) { | |
316 | err = -EIO; | |
b3f8d68f YZ |
317 | } |
318 | spin_unlock(&ci->i_ceph_lock); | |
319 | if (err < 0) { | |
320 | if (F_UNLCK == fl->fl_type) | |
321 | locks_lock_file_wait(file, fl); | |
322 | return err; | |
323 | } | |
89aa5930 | 324 | |
0e8e95d6 YZ |
325 | if (IS_SETLKW(cmd)) |
326 | wait = 1; | |
327 | ||
328 | if (F_RDLCK == fl->fl_type) | |
40819f6f | 329 | lock_cmd = CEPH_LOCK_SHARED; |
0e8e95d6 | 330 | else if (F_WRLCK == fl->fl_type) |
40819f6f GF |
331 | lock_cmd = CEPH_LOCK_EXCL; |
332 | else | |
333 | lock_cmd = CEPH_LOCK_UNLOCK; | |
40819f6f | 334 | |
bbb480ab YZ |
335 | if (F_UNLCK == fl->fl_type) { |
336 | err = try_unlock_file(file, fl); | |
337 | if (err <= 0) | |
338 | return err; | |
339 | } | |
340 | ||
40819f6f | 341 | err = ceph_lock_message(CEPH_LOCK_FLOCK, CEPH_MDS_OP_SETFILELOCK, |
89aa5930 | 342 | inode, lock_cmd, wait, fl); |
bbb480ab | 343 | if (!err && F_UNLCK != fl->fl_type) { |
4f656367 | 344 | err = locks_lock_file_wait(file, fl); |
40819f6f GF |
345 | if (err) { |
346 | ceph_lock_message(CEPH_LOCK_FLOCK, | |
347 | CEPH_MDS_OP_SETFILELOCK, | |
89aa5930 | 348 | inode, CEPH_LOCK_UNLOCK, 0, fl); |
4c069a58 | 349 | dout("got %d on locks_lock_file_wait, undid lock\n", err); |
40819f6f | 350 | } |
40819f6f GF |
351 | } |
352 | return err; | |
353 | } | |
354 | ||
5263e31e JL |
355 | /* |
356 | * Fills in the passed counter variables, so you can prepare pagelist metadata | |
357 | * before calling ceph_encode_locks. | |
40819f6f GF |
358 | */ |
359 | void ceph_count_locks(struct inode *inode, int *fcntl_count, int *flock_count) | |
360 | { | |
e084c1bd | 361 | struct file_lock *lock; |
5263e31e | 362 | struct file_lock_context *ctx; |
40819f6f GF |
363 | |
364 | *fcntl_count = 0; | |
365 | *flock_count = 0; | |
366 | ||
5263e31e JL |
367 | ctx = inode->i_flctx; |
368 | if (ctx) { | |
e084c1bd JL |
369 | spin_lock(&ctx->flc_lock); |
370 | list_for_each_entry(lock, &ctx->flc_posix, fl_list) | |
371 | ++(*fcntl_count); | |
372 | list_for_each_entry(lock, &ctx->flc_flock, fl_list) | |
373 | ++(*flock_count); | |
374 | spin_unlock(&ctx->flc_lock); | |
40819f6f | 375 | } |
4c069a58 | 376 | dout("counted %d flock locks and %d fcntl locks\n", |
40819f6f GF |
377 | *flock_count, *fcntl_count); |
378 | } | |
379 | ||
c6db8472 YZ |
380 | /* |
381 | * Given a pointer to a lock, convert it to a ceph filelock | |
382 | */ | |
383 | static int lock_to_ceph_filelock(struct file_lock *lock, | |
384 | struct ceph_filelock *cephlock) | |
385 | { | |
386 | int err = 0; | |
387 | cephlock->start = cpu_to_le64(lock->fl_start); | |
388 | cephlock->length = cpu_to_le64(lock->fl_end - lock->fl_start + 1); | |
389 | cephlock->client = cpu_to_le64(0); | |
390 | cephlock->pid = cpu_to_le64((u64)lock->fl_pid); | |
391 | cephlock->owner = cpu_to_le64(secure_addr(lock->fl_owner)); | |
392 | ||
393 | switch (lock->fl_type) { | |
394 | case F_RDLCK: | |
395 | cephlock->type = CEPH_LOCK_SHARED; | |
396 | break; | |
397 | case F_WRLCK: | |
398 | cephlock->type = CEPH_LOCK_EXCL; | |
399 | break; | |
400 | case F_UNLCK: | |
401 | cephlock->type = CEPH_LOCK_UNLOCK; | |
402 | break; | |
403 | default: | |
4c069a58 | 404 | dout("Have unknown lock type %d\n", lock->fl_type); |
c6db8472 YZ |
405 | err = -EINVAL; |
406 | } | |
407 | ||
408 | return err; | |
409 | } | |
410 | ||
06a1ad43 | 411 | /* |
39be95e9 | 412 | * Encode the flock and fcntl locks for the given inode into the ceph_filelock |
1c8c601a | 413 | * array. Must be called with inode->i_lock already held. |
39be95e9 | 414 | * If we encounter more of a specific lock type than expected, return -ENOSPC. |
40819f6f | 415 | */ |
39be95e9 JS |
416 | int ceph_encode_locks_to_buffer(struct inode *inode, |
417 | struct ceph_filelock *flocks, | |
418 | int num_fcntl_locks, int num_flock_locks) | |
40819f6f GF |
419 | { |
420 | struct file_lock *lock; | |
bd61e0a9 | 421 | struct file_lock_context *ctx = inode->i_flctx; |
40819f6f | 422 | int err = 0; |
fca4451a GF |
423 | int seen_fcntl = 0; |
424 | int seen_flock = 0; | |
39be95e9 | 425 | int l = 0; |
40819f6f | 426 | |
4c069a58 | 427 | dout("encoding %d flock and %d fcntl locks\n", num_flock_locks, |
40819f6f | 428 | num_fcntl_locks); |
39be95e9 | 429 | |
bd61e0a9 JL |
430 | if (!ctx) |
431 | return 0; | |
432 | ||
6109c850 | 433 | spin_lock(&ctx->flc_lock); |
f6762cb2 | 434 | list_for_each_entry(lock, &ctx->flc_posix, fl_list) { |
bd61e0a9 JL |
435 | ++seen_fcntl; |
436 | if (seen_fcntl > num_fcntl_locks) { | |
437 | err = -ENOSPC; | |
438 | goto fail; | |
40819f6f | 439 | } |
bd61e0a9 JL |
440 | err = lock_to_ceph_filelock(lock, &flocks[l]); |
441 | if (err) | |
442 | goto fail; | |
443 | ++l; | |
40819f6f | 444 | } |
bd61e0a9 JL |
445 | list_for_each_entry(lock, &ctx->flc_flock, fl_list) { |
446 | ++seen_flock; | |
447 | if (seen_flock > num_flock_locks) { | |
448 | err = -ENOSPC; | |
449 | goto fail; | |
40819f6f | 450 | } |
bd61e0a9 JL |
451 | err = lock_to_ceph_filelock(lock, &flocks[l]); |
452 | if (err) | |
453 | goto fail; | |
454 | ++l; | |
40819f6f GF |
455 | } |
456 | fail: | |
6109c850 | 457 | spin_unlock(&ctx->flc_lock); |
40819f6f GF |
458 | return err; |
459 | } | |
460 | ||
06a1ad43 | 461 | /* |
39be95e9 JS |
462 | * Copy the encoded flock and fcntl locks into the pagelist. |
463 | * Format is: #fcntl locks, sequential fcntl locks, #flock locks, | |
464 | * sequential flock locks. | |
465 | * Returns zero on success. | |
466 | */ | |
467 | int ceph_locks_to_pagelist(struct ceph_filelock *flocks, | |
468 | struct ceph_pagelist *pagelist, | |
469 | int num_fcntl_locks, int num_flock_locks) | |
470 | { | |
471 | int err = 0; | |
472 | __le32 nlocks; | |
473 | ||
474 | nlocks = cpu_to_le32(num_fcntl_locks); | |
475 | err = ceph_pagelist_append(pagelist, &nlocks, sizeof(nlocks)); | |
476 | if (err) | |
477 | goto out_fail; | |
478 | ||
4deb14a2 YZ |
479 | if (num_fcntl_locks > 0) { |
480 | err = ceph_pagelist_append(pagelist, flocks, | |
481 | num_fcntl_locks * sizeof(*flocks)); | |
482 | if (err) | |
483 | goto out_fail; | |
484 | } | |
39be95e9 JS |
485 | |
486 | nlocks = cpu_to_le32(num_flock_locks); | |
487 | err = ceph_pagelist_append(pagelist, &nlocks, sizeof(nlocks)); | |
488 | if (err) | |
489 | goto out_fail; | |
490 | ||
4deb14a2 YZ |
491 | if (num_flock_locks > 0) { |
492 | err = ceph_pagelist_append(pagelist, &flocks[num_fcntl_locks], | |
493 | num_flock_locks * sizeof(*flocks)); | |
494 | } | |
39be95e9 JS |
495 | out_fail: |
496 | return err; | |
497 | } |