Loading...
1#include <linux/ceph/ceph_debug.h>
2
3#include <linux/file.h>
4#include <linux/namei.h>
5#include <linux/random.h>
6
7#include "super.h"
8#include "mds_client.h"
9#include <linux/ceph/pagelist.h>
10
11static u64 lock_secret;
12static int ceph_lock_wait_for_completion(struct ceph_mds_client *mdsc,
13 struct ceph_mds_request *req);
14
15static inline u64 secure_addr(void *addr)
16{
17 u64 v = lock_secret ^ (u64)(unsigned long)addr;
18 /*
19 * Set the most significant bit, so that MDS knows the 'owner'
20 * is sufficient to identify the owner of lock. (old code uses
21 * both 'owner' and 'pid')
22 */
23 v |= (1ULL << 63);
24 return v;
25}
26
27void __init ceph_flock_init(void)
28{
29 get_random_bytes(&lock_secret, sizeof(lock_secret));
30}
31
32/**
33 * Implement fcntl and flock locking functions.
34 */
35static int ceph_lock_message(u8 lock_type, u16 operation, struct file *file,
36 int cmd, u8 wait, struct file_lock *fl)
37{
38 struct inode *inode = file_inode(file);
39 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
40 struct ceph_mds_request *req;
41 int err;
42 u64 length = 0;
43 u64 owner;
44
45 if (operation != CEPH_MDS_OP_SETFILELOCK || cmd == CEPH_LOCK_UNLOCK)
46 wait = 0;
47
48 req = ceph_mdsc_create_request(mdsc, operation, USE_AUTH_MDS);
49 if (IS_ERR(req))
50 return PTR_ERR(req);
51 req->r_inode = inode;
52 ihold(inode);
53 req->r_num_caps = 1;
54
55 /* mds requires start and length rather than start and end */
56 if (LLONG_MAX == fl->fl_end)
57 length = 0;
58 else
59 length = fl->fl_end - fl->fl_start + 1;
60
61 owner = secure_addr(fl->fl_owner);
62
63 dout("ceph_lock_message: rule: %d, op: %d, owner: %llx, pid: %llu, "
64 "start: %llu, length: %llu, wait: %d, type: %d", (int)lock_type,
65 (int)operation, owner, (u64)fl->fl_pid, fl->fl_start, length,
66 wait, fl->fl_type);
67
68 req->r_args.filelock_change.rule = lock_type;
69 req->r_args.filelock_change.type = cmd;
70 req->r_args.filelock_change.owner = cpu_to_le64(owner);
71 req->r_args.filelock_change.pid = cpu_to_le64((u64)fl->fl_pid);
72 req->r_args.filelock_change.start = cpu_to_le64(fl->fl_start);
73 req->r_args.filelock_change.length = cpu_to_le64(length);
74 req->r_args.filelock_change.wait = wait;
75
76 if (wait)
77 req->r_wait_for_completion = ceph_lock_wait_for_completion;
78
79 err = ceph_mdsc_do_request(mdsc, inode, req);
80
81 if (operation == CEPH_MDS_OP_GETFILELOCK) {
82 fl->fl_pid = le64_to_cpu(req->r_reply_info.filelock_reply->pid);
83 if (CEPH_LOCK_SHARED == req->r_reply_info.filelock_reply->type)
84 fl->fl_type = F_RDLCK;
85 else if (CEPH_LOCK_EXCL == req->r_reply_info.filelock_reply->type)
86 fl->fl_type = F_WRLCK;
87 else
88 fl->fl_type = F_UNLCK;
89
90 fl->fl_start = le64_to_cpu(req->r_reply_info.filelock_reply->start);
91 length = le64_to_cpu(req->r_reply_info.filelock_reply->start) +
92 le64_to_cpu(req->r_reply_info.filelock_reply->length);
93 if (length >= 1)
94 fl->fl_end = length -1;
95 else
96 fl->fl_end = 0;
97
98 }
99 ceph_mdsc_put_request(req);
100 dout("ceph_lock_message: rule: %d, op: %d, pid: %llu, start: %llu, "
101 "length: %llu, wait: %d, type: %d, err code %d", (int)lock_type,
102 (int)operation, (u64)fl->fl_pid, fl->fl_start,
103 length, wait, fl->fl_type, err);
104 return err;
105}
106
107static int ceph_lock_wait_for_completion(struct ceph_mds_client *mdsc,
108 struct ceph_mds_request *req)
109{
110 struct ceph_mds_request *intr_req;
111 struct inode *inode = req->r_inode;
112 int err, lock_type;
113
114 BUG_ON(req->r_op != CEPH_MDS_OP_SETFILELOCK);
115 if (req->r_args.filelock_change.rule == CEPH_LOCK_FCNTL)
116 lock_type = CEPH_LOCK_FCNTL_INTR;
117 else if (req->r_args.filelock_change.rule == CEPH_LOCK_FLOCK)
118 lock_type = CEPH_LOCK_FLOCK_INTR;
119 else
120 BUG_ON(1);
121 BUG_ON(req->r_args.filelock_change.type == CEPH_LOCK_UNLOCK);
122
123 err = wait_for_completion_interruptible(&req->r_completion);
124 if (!err)
125 return 0;
126
127 dout("ceph_lock_wait_for_completion: request %llu was interrupted\n",
128 req->r_tid);
129
130 intr_req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETFILELOCK,
131 USE_AUTH_MDS);
132 if (IS_ERR(intr_req))
133 return PTR_ERR(intr_req);
134
135 intr_req->r_inode = inode;
136 ihold(inode);
137 intr_req->r_num_caps = 1;
138
139 intr_req->r_args.filelock_change = req->r_args.filelock_change;
140 intr_req->r_args.filelock_change.rule = lock_type;
141 intr_req->r_args.filelock_change.type = CEPH_LOCK_UNLOCK;
142
143 err = ceph_mdsc_do_request(mdsc, inode, intr_req);
144 ceph_mdsc_put_request(intr_req);
145
146 if (err && err != -ERESTARTSYS)
147 return err;
148
149 wait_for_completion(&req->r_completion);
150 return 0;
151}
152
153/**
154 * Attempt to set an fcntl lock.
155 * For now, this just goes away to the server. Later it may be more awesome.
156 */
157int ceph_lock(struct file *file, int cmd, struct file_lock *fl)
158{
159 u8 lock_cmd;
160 int err;
161 u8 wait = 0;
162 u16 op = CEPH_MDS_OP_SETFILELOCK;
163
164 if (!(fl->fl_flags & FL_POSIX))
165 return -ENOLCK;
166 /* No mandatory locks */
167 if (__mandatory_lock(file->f_mapping->host) && fl->fl_type != F_UNLCK)
168 return -ENOLCK;
169
170 dout("ceph_lock, fl_owner: %p", fl->fl_owner);
171
172 /* set wait bit as appropriate, then make command as Ceph expects it*/
173 if (IS_GETLK(cmd))
174 op = CEPH_MDS_OP_GETFILELOCK;
175 else if (IS_SETLKW(cmd))
176 wait = 1;
177
178 if (F_RDLCK == fl->fl_type)
179 lock_cmd = CEPH_LOCK_SHARED;
180 else if (F_WRLCK == fl->fl_type)
181 lock_cmd = CEPH_LOCK_EXCL;
182 else
183 lock_cmd = CEPH_LOCK_UNLOCK;
184
185 err = ceph_lock_message(CEPH_LOCK_FCNTL, op, file, lock_cmd, wait, fl);
186 if (!err) {
187 if (op != CEPH_MDS_OP_GETFILELOCK) {
188 dout("mds locked, locking locally");
189 err = posix_lock_file(file, fl, NULL);
190 if (err && (CEPH_MDS_OP_SETFILELOCK == op)) {
191 /* undo! This should only happen if
192 * the kernel detects local
193 * deadlock. */
194 ceph_lock_message(CEPH_LOCK_FCNTL, op, file,
195 CEPH_LOCK_UNLOCK, 0, fl);
196 dout("got %d on posix_lock_file, undid lock",
197 err);
198 }
199 }
200 }
201 return err;
202}
203
204int ceph_flock(struct file *file, int cmd, struct file_lock *fl)
205{
206 u8 lock_cmd;
207 int err;
208 u8 wait = 0;
209
210 if (!(fl->fl_flags & FL_FLOCK))
211 return -ENOLCK;
212 /* No mandatory locks */
213 if (__mandatory_lock(file->f_mapping->host) && fl->fl_type != F_UNLCK)
214 return -ENOLCK;
215
216 dout("ceph_flock, fl_file: %p", fl->fl_file);
217
218 if (IS_SETLKW(cmd))
219 wait = 1;
220
221 if (F_RDLCK == fl->fl_type)
222 lock_cmd = CEPH_LOCK_SHARED;
223 else if (F_WRLCK == fl->fl_type)
224 lock_cmd = CEPH_LOCK_EXCL;
225 else
226 lock_cmd = CEPH_LOCK_UNLOCK;
227
228 err = ceph_lock_message(CEPH_LOCK_FLOCK, CEPH_MDS_OP_SETFILELOCK,
229 file, lock_cmd, wait, fl);
230 if (!err) {
231 err = locks_lock_file_wait(file, fl);
232 if (err) {
233 ceph_lock_message(CEPH_LOCK_FLOCK,
234 CEPH_MDS_OP_SETFILELOCK,
235 file, CEPH_LOCK_UNLOCK, 0, fl);
236 dout("got %d on locks_lock_file_wait, undid lock", err);
237 }
238 }
239 return err;
240}
241
242/*
243 * Fills in the passed counter variables, so you can prepare pagelist metadata
244 * before calling ceph_encode_locks.
245 */
246void ceph_count_locks(struct inode *inode, int *fcntl_count, int *flock_count)
247{
248 struct file_lock *lock;
249 struct file_lock_context *ctx;
250
251 *fcntl_count = 0;
252 *flock_count = 0;
253
254 ctx = inode->i_flctx;
255 if (ctx) {
256 spin_lock(&ctx->flc_lock);
257 list_for_each_entry(lock, &ctx->flc_posix, fl_list)
258 ++(*fcntl_count);
259 list_for_each_entry(lock, &ctx->flc_flock, fl_list)
260 ++(*flock_count);
261 spin_unlock(&ctx->flc_lock);
262 }
263 dout("counted %d flock locks and %d fcntl locks",
264 *flock_count, *fcntl_count);
265}
266
267/**
268 * Encode the flock and fcntl locks for the given inode into the ceph_filelock
269 * array. Must be called with inode->i_lock already held.
270 * If we encounter more of a specific lock type than expected, return -ENOSPC.
271 */
272int ceph_encode_locks_to_buffer(struct inode *inode,
273 struct ceph_filelock *flocks,
274 int num_fcntl_locks, int num_flock_locks)
275{
276 struct file_lock *lock;
277 struct file_lock_context *ctx = inode->i_flctx;
278 int err = 0;
279 int seen_fcntl = 0;
280 int seen_flock = 0;
281 int l = 0;
282
283 dout("encoding %d flock and %d fcntl locks", num_flock_locks,
284 num_fcntl_locks);
285
286 if (!ctx)
287 return 0;
288
289 spin_lock(&ctx->flc_lock);
290 list_for_each_entry(lock, &ctx->flc_posix, fl_list) {
291 ++seen_fcntl;
292 if (seen_fcntl > num_fcntl_locks) {
293 err = -ENOSPC;
294 goto fail;
295 }
296 err = lock_to_ceph_filelock(lock, &flocks[l]);
297 if (err)
298 goto fail;
299 ++l;
300 }
301 list_for_each_entry(lock, &ctx->flc_flock, fl_list) {
302 ++seen_flock;
303 if (seen_flock > num_flock_locks) {
304 err = -ENOSPC;
305 goto fail;
306 }
307 err = lock_to_ceph_filelock(lock, &flocks[l]);
308 if (err)
309 goto fail;
310 ++l;
311 }
312fail:
313 spin_unlock(&ctx->flc_lock);
314 return err;
315}
316
317/**
318 * Copy the encoded flock and fcntl locks into the pagelist.
319 * Format is: #fcntl locks, sequential fcntl locks, #flock locks,
320 * sequential flock locks.
321 * Returns zero on success.
322 */
323int ceph_locks_to_pagelist(struct ceph_filelock *flocks,
324 struct ceph_pagelist *pagelist,
325 int num_fcntl_locks, int num_flock_locks)
326{
327 int err = 0;
328 __le32 nlocks;
329
330 nlocks = cpu_to_le32(num_fcntl_locks);
331 err = ceph_pagelist_append(pagelist, &nlocks, sizeof(nlocks));
332 if (err)
333 goto out_fail;
334
335 err = ceph_pagelist_append(pagelist, flocks,
336 num_fcntl_locks * sizeof(*flocks));
337 if (err)
338 goto out_fail;
339
340 nlocks = cpu_to_le32(num_flock_locks);
341 err = ceph_pagelist_append(pagelist, &nlocks, sizeof(nlocks));
342 if (err)
343 goto out_fail;
344
345 err = ceph_pagelist_append(pagelist,
346 &flocks[num_fcntl_locks],
347 num_flock_locks * sizeof(*flocks));
348out_fail:
349 return err;
350}
351
352/*
353 * Given a pointer to a lock, convert it to a ceph filelock
354 */
355int lock_to_ceph_filelock(struct file_lock *lock,
356 struct ceph_filelock *cephlock)
357{
358 int err = 0;
359 cephlock->start = cpu_to_le64(lock->fl_start);
360 cephlock->length = cpu_to_le64(lock->fl_end - lock->fl_start + 1);
361 cephlock->client = cpu_to_le64(0);
362 cephlock->pid = cpu_to_le64((u64)lock->fl_pid);
363 cephlock->owner = cpu_to_le64(secure_addr(lock->fl_owner));
364
365 switch (lock->fl_type) {
366 case F_RDLCK:
367 cephlock->type = CEPH_LOCK_SHARED;
368 break;
369 case F_WRLCK:
370 cephlock->type = CEPH_LOCK_EXCL;
371 break;
372 case F_UNLCK:
373 cephlock->type = CEPH_LOCK_UNLOCK;
374 break;
375 default:
376 dout("Have unknown lock type %d", lock->fl_type);
377 err = -EINVAL;
378 }
379
380 return err;
381}
1#include <linux/ceph/ceph_debug.h>
2
3#include <linux/file.h>
4#include <linux/namei.h>
5#include <linux/random.h>
6
7#include "super.h"
8#include "mds_client.h"
9#include <linux/ceph/pagelist.h>
10
11static u64 lock_secret;
12
13static inline u64 secure_addr(void *addr)
14{
15 u64 v = lock_secret ^ (u64)(unsigned long)addr;
16 /*
17 * Set the most significant bit, so that MDS knows the 'owner'
18 * is sufficient to identify the owner of lock. (old code uses
19 * both 'owner' and 'pid')
20 */
21 v |= (1ULL << 63);
22 return v;
23}
24
25void __init ceph_flock_init(void)
26{
27 get_random_bytes(&lock_secret, sizeof(lock_secret));
28}
29
30/**
31 * Implement fcntl and flock locking functions.
32 */
33static int ceph_lock_message(u8 lock_type, u16 operation, struct file *file,
34 int cmd, u8 wait, struct file_lock *fl)
35{
36 struct inode *inode = file_inode(file);
37 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
38 struct ceph_mds_request *req;
39 int err;
40 u64 length = 0;
41 u64 owner;
42
43 req = ceph_mdsc_create_request(mdsc, operation, USE_AUTH_MDS);
44 if (IS_ERR(req))
45 return PTR_ERR(req);
46 req->r_inode = inode;
47 ihold(inode);
48 req->r_num_caps = 1;
49
50 /* mds requires start and length rather than start and end */
51 if (LLONG_MAX == fl->fl_end)
52 length = 0;
53 else
54 length = fl->fl_end - fl->fl_start + 1;
55
56 if (lock_type == CEPH_LOCK_FCNTL)
57 owner = secure_addr(fl->fl_owner);
58 else
59 owner = secure_addr(fl->fl_file);
60
61 dout("ceph_lock_message: rule: %d, op: %d, owner: %llx, pid: %llu, "
62 "start: %llu, length: %llu, wait: %d, type: %d", (int)lock_type,
63 (int)operation, owner, (u64)fl->fl_pid, fl->fl_start, length,
64 wait, fl->fl_type);
65
66 req->r_args.filelock_change.rule = lock_type;
67 req->r_args.filelock_change.type = cmd;
68 req->r_args.filelock_change.owner = cpu_to_le64(owner);
69 req->r_args.filelock_change.pid = cpu_to_le64((u64)fl->fl_pid);
70 req->r_args.filelock_change.start = cpu_to_le64(fl->fl_start);
71 req->r_args.filelock_change.length = cpu_to_le64(length);
72 req->r_args.filelock_change.wait = wait;
73
74 err = ceph_mdsc_do_request(mdsc, inode, req);
75
76 if (operation == CEPH_MDS_OP_GETFILELOCK) {
77 fl->fl_pid = le64_to_cpu(req->r_reply_info.filelock_reply->pid);
78 if (CEPH_LOCK_SHARED == req->r_reply_info.filelock_reply->type)
79 fl->fl_type = F_RDLCK;
80 else if (CEPH_LOCK_EXCL == req->r_reply_info.filelock_reply->type)
81 fl->fl_type = F_WRLCK;
82 else
83 fl->fl_type = F_UNLCK;
84
85 fl->fl_start = le64_to_cpu(req->r_reply_info.filelock_reply->start);
86 length = le64_to_cpu(req->r_reply_info.filelock_reply->start) +
87 le64_to_cpu(req->r_reply_info.filelock_reply->length);
88 if (length >= 1)
89 fl->fl_end = length -1;
90 else
91 fl->fl_end = 0;
92
93 }
94 ceph_mdsc_put_request(req);
95 dout("ceph_lock_message: rule: %d, op: %d, pid: %llu, start: %llu, "
96 "length: %llu, wait: %d, type: %d, err code %d", (int)lock_type,
97 (int)operation, (u64)fl->fl_pid, fl->fl_start,
98 length, wait, fl->fl_type, err);
99 return err;
100}
101
102/**
103 * Attempt to set an fcntl lock.
104 * For now, this just goes away to the server. Later it may be more awesome.
105 */
106int ceph_lock(struct file *file, int cmd, struct file_lock *fl)
107{
108 u8 lock_cmd;
109 int err;
110 u8 wait = 0;
111 u16 op = CEPH_MDS_OP_SETFILELOCK;
112
113 if (!(fl->fl_flags & FL_POSIX))
114 return -ENOLCK;
115 /* No mandatory locks */
116 if (__mandatory_lock(file->f_mapping->host) && fl->fl_type != F_UNLCK)
117 return -ENOLCK;
118
119 dout("ceph_lock, fl_owner: %p", fl->fl_owner);
120
121 /* set wait bit as appropriate, then make command as Ceph expects it*/
122 if (IS_GETLK(cmd))
123 op = CEPH_MDS_OP_GETFILELOCK;
124 else if (IS_SETLKW(cmd))
125 wait = 1;
126
127 if (F_RDLCK == fl->fl_type)
128 lock_cmd = CEPH_LOCK_SHARED;
129 else if (F_WRLCK == fl->fl_type)
130 lock_cmd = CEPH_LOCK_EXCL;
131 else
132 lock_cmd = CEPH_LOCK_UNLOCK;
133
134 err = ceph_lock_message(CEPH_LOCK_FCNTL, op, file, lock_cmd, wait, fl);
135 if (!err) {
136 if (op != CEPH_MDS_OP_GETFILELOCK) {
137 dout("mds locked, locking locally");
138 err = posix_lock_file(file, fl, NULL);
139 if (err && (CEPH_MDS_OP_SETFILELOCK == op)) {
140 /* undo! This should only happen if
141 * the kernel detects local
142 * deadlock. */
143 ceph_lock_message(CEPH_LOCK_FCNTL, op, file,
144 CEPH_LOCK_UNLOCK, 0, fl);
145 dout("got %d on posix_lock_file, undid lock",
146 err);
147 }
148 }
149
150 } else if (err == -ERESTARTSYS) {
151 dout("undoing lock\n");
152 ceph_lock_message(CEPH_LOCK_FCNTL, op, file,
153 CEPH_LOCK_UNLOCK, 0, fl);
154 }
155 return err;
156}
157
158int ceph_flock(struct file *file, int cmd, struct file_lock *fl)
159{
160 u8 lock_cmd;
161 int err;
162 u8 wait = 0;
163
164 if (!(fl->fl_flags & FL_FLOCK))
165 return -ENOLCK;
166 /* No mandatory locks */
167 if (__mandatory_lock(file->f_mapping->host) && fl->fl_type != F_UNLCK)
168 return -ENOLCK;
169
170 dout("ceph_flock, fl_file: %p", fl->fl_file);
171
172 if (IS_SETLKW(cmd))
173 wait = 1;
174
175 if (F_RDLCK == fl->fl_type)
176 lock_cmd = CEPH_LOCK_SHARED;
177 else if (F_WRLCK == fl->fl_type)
178 lock_cmd = CEPH_LOCK_EXCL;
179 else
180 lock_cmd = CEPH_LOCK_UNLOCK;
181
182 err = ceph_lock_message(CEPH_LOCK_FLOCK, CEPH_MDS_OP_SETFILELOCK,
183 file, lock_cmd, wait, fl);
184 if (!err) {
185 err = flock_lock_file_wait(file, fl);
186 if (err) {
187 ceph_lock_message(CEPH_LOCK_FLOCK,
188 CEPH_MDS_OP_SETFILELOCK,
189 file, CEPH_LOCK_UNLOCK, 0, fl);
190 dout("got %d on flock_lock_file_wait, undid lock", err);
191 }
192 } else if (err == -ERESTARTSYS) {
193 dout("undoing lock\n");
194 ceph_lock_message(CEPH_LOCK_FLOCK,
195 CEPH_MDS_OP_SETFILELOCK,
196 file, CEPH_LOCK_UNLOCK, 0, fl);
197 }
198 return err;
199}
200
201/**
202 * Must be called with lock_flocks() already held. Fills in the passed
203 * counter variables, so you can prepare pagelist metadata before calling
204 * ceph_encode_locks.
205 */
206void ceph_count_locks(struct inode *inode, int *fcntl_count, int *flock_count)
207{
208 struct file_lock *lock;
209
210 *fcntl_count = 0;
211 *flock_count = 0;
212
213 for (lock = inode->i_flock; lock != NULL; lock = lock->fl_next) {
214 if (lock->fl_flags & FL_POSIX)
215 ++(*fcntl_count);
216 else if (lock->fl_flags & FL_FLOCK)
217 ++(*flock_count);
218 }
219 dout("counted %d flock locks and %d fcntl locks",
220 *flock_count, *fcntl_count);
221}
222
223/**
224 * Encode the flock and fcntl locks for the given inode into the ceph_filelock
225 * array. Must be called with inode->i_lock already held.
226 * If we encounter more of a specific lock type than expected, return -ENOSPC.
227 */
228int ceph_encode_locks_to_buffer(struct inode *inode,
229 struct ceph_filelock *flocks,
230 int num_fcntl_locks, int num_flock_locks)
231{
232 struct file_lock *lock;
233 int err = 0;
234 int seen_fcntl = 0;
235 int seen_flock = 0;
236 int l = 0;
237
238 dout("encoding %d flock and %d fcntl locks", num_flock_locks,
239 num_fcntl_locks);
240
241 for (lock = inode->i_flock; lock != NULL; lock = lock->fl_next) {
242 if (lock->fl_flags & FL_POSIX) {
243 ++seen_fcntl;
244 if (seen_fcntl > num_fcntl_locks) {
245 err = -ENOSPC;
246 goto fail;
247 }
248 err = lock_to_ceph_filelock(lock, &flocks[l]);
249 if (err)
250 goto fail;
251 ++l;
252 }
253 }
254 for (lock = inode->i_flock; lock != NULL; lock = lock->fl_next) {
255 if (lock->fl_flags & FL_FLOCK) {
256 ++seen_flock;
257 if (seen_flock > num_flock_locks) {
258 err = -ENOSPC;
259 goto fail;
260 }
261 err = lock_to_ceph_filelock(lock, &flocks[l]);
262 if (err)
263 goto fail;
264 ++l;
265 }
266 }
267fail:
268 return err;
269}
270
271/**
272 * Copy the encoded flock and fcntl locks into the pagelist.
273 * Format is: #fcntl locks, sequential fcntl locks, #flock locks,
274 * sequential flock locks.
275 * Returns zero on success.
276 */
277int ceph_locks_to_pagelist(struct ceph_filelock *flocks,
278 struct ceph_pagelist *pagelist,
279 int num_fcntl_locks, int num_flock_locks)
280{
281 int err = 0;
282 __le32 nlocks;
283
284 nlocks = cpu_to_le32(num_fcntl_locks);
285 err = ceph_pagelist_append(pagelist, &nlocks, sizeof(nlocks));
286 if (err)
287 goto out_fail;
288
289 err = ceph_pagelist_append(pagelist, flocks,
290 num_fcntl_locks * sizeof(*flocks));
291 if (err)
292 goto out_fail;
293
294 nlocks = cpu_to_le32(num_flock_locks);
295 err = ceph_pagelist_append(pagelist, &nlocks, sizeof(nlocks));
296 if (err)
297 goto out_fail;
298
299 err = ceph_pagelist_append(pagelist,
300 &flocks[num_fcntl_locks],
301 num_flock_locks * sizeof(*flocks));
302out_fail:
303 return err;
304}
305
306/*
307 * Given a pointer to a lock, convert it to a ceph filelock
308 */
309int lock_to_ceph_filelock(struct file_lock *lock,
310 struct ceph_filelock *cephlock)
311{
312 int err = 0;
313 cephlock->start = cpu_to_le64(lock->fl_start);
314 cephlock->length = cpu_to_le64(lock->fl_end - lock->fl_start + 1);
315 cephlock->client = cpu_to_le64(0);
316 cephlock->pid = cpu_to_le64((u64)lock->fl_pid);
317 if (lock->fl_flags & FL_POSIX)
318 cephlock->owner = cpu_to_le64(secure_addr(lock->fl_owner));
319 else
320 cephlock->owner = cpu_to_le64(secure_addr(lock->fl_file));
321
322 switch (lock->fl_type) {
323 case F_RDLCK:
324 cephlock->type = CEPH_LOCK_SHARED;
325 break;
326 case F_WRLCK:
327 cephlock->type = CEPH_LOCK_EXCL;
328 break;
329 case F_UNLCK:
330 cephlock->type = CEPH_LOCK_UNLOCK;
331 break;
332 default:
333 dout("Have unknown lock type %d", lock->fl_type);
334 err = -EINVAL;
335 }
336
337 return err;
338}