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1#include <linux/ceph/ceph_debug.h>
2
3#include <linux/file.h>
4#include <linux/namei.h>
5
6#include "super.h"
7#include "mds_client.h"
8#include <linux/ceph/pagelist.h>
9
10/**
11 * Implement fcntl and flock locking functions.
12 */
13static int ceph_lock_message(u8 lock_type, u16 operation, struct file *file,
14 int cmd, u8 wait, struct file_lock *fl)
15{
16 struct inode *inode = file->f_dentry->d_inode;
17 struct ceph_mds_client *mdsc =
18 ceph_sb_to_client(inode->i_sb)->mdsc;
19 struct ceph_mds_request *req;
20 int err;
21 u64 length = 0;
22
23 req = ceph_mdsc_create_request(mdsc, operation, USE_AUTH_MDS);
24 if (IS_ERR(req))
25 return PTR_ERR(req);
26 req->r_inode = inode;
27 ihold(inode);
28
29 /* mds requires start and length rather than start and end */
30 if (LLONG_MAX == fl->fl_end)
31 length = 0;
32 else
33 length = fl->fl_end - fl->fl_start + 1;
34
35 dout("ceph_lock_message: rule: %d, op: %d, pid: %llu, start: %llu, "
36 "length: %llu, wait: %d, type: %d", (int)lock_type,
37 (int)operation, (u64)fl->fl_pid, fl->fl_start,
38 length, wait, fl->fl_type);
39
40 req->r_args.filelock_change.rule = lock_type;
41 req->r_args.filelock_change.type = cmd;
42 req->r_args.filelock_change.pid = cpu_to_le64((u64)fl->fl_pid);
43 /* This should be adjusted, but I'm not sure if
44 namespaces actually get id numbers*/
45 req->r_args.filelock_change.pid_namespace =
46 cpu_to_le64((u64)(unsigned long)fl->fl_nspid);
47 req->r_args.filelock_change.start = cpu_to_le64(fl->fl_start);
48 req->r_args.filelock_change.length = cpu_to_le64(length);
49 req->r_args.filelock_change.wait = wait;
50
51 err = ceph_mdsc_do_request(mdsc, inode, req);
52
53 if ( operation == CEPH_MDS_OP_GETFILELOCK){
54 fl->fl_pid = le64_to_cpu(req->r_reply_info.filelock_reply->pid);
55 if (CEPH_LOCK_SHARED == req->r_reply_info.filelock_reply->type)
56 fl->fl_type = F_RDLCK;
57 else if (CEPH_LOCK_EXCL == req->r_reply_info.filelock_reply->type)
58 fl->fl_type = F_WRLCK;
59 else
60 fl->fl_type = F_UNLCK;
61
62 fl->fl_start = le64_to_cpu(req->r_reply_info.filelock_reply->start);
63 length = le64_to_cpu(req->r_reply_info.filelock_reply->start) +
64 le64_to_cpu(req->r_reply_info.filelock_reply->length);
65 if (length >= 1)
66 fl->fl_end = length -1;
67 else
68 fl->fl_end = 0;
69
70 }
71 ceph_mdsc_put_request(req);
72 dout("ceph_lock_message: rule: %d, op: %d, pid: %llu, start: %llu, "
73 "length: %llu, wait: %d, type: %d, err code %d", (int)lock_type,
74 (int)operation, (u64)fl->fl_pid, fl->fl_start,
75 length, wait, fl->fl_type, err);
76 return err;
77}
78
79/**
80 * Attempt to set an fcntl lock.
81 * For now, this just goes away to the server. Later it may be more awesome.
82 */
83int ceph_lock(struct file *file, int cmd, struct file_lock *fl)
84{
85 u8 lock_cmd;
86 int err;
87 u8 wait = 0;
88 u16 op = CEPH_MDS_OP_SETFILELOCK;
89
90 fl->fl_nspid = get_pid(task_tgid(current));
91 dout("ceph_lock, fl_pid:%d", fl->fl_pid);
92
93 /* set wait bit as appropriate, then make command as Ceph expects it*/
94 if (F_SETLKW == cmd)
95 wait = 1;
96 if (F_GETLK == cmd)
97 op = CEPH_MDS_OP_GETFILELOCK;
98
99 if (F_RDLCK == fl->fl_type)
100 lock_cmd = CEPH_LOCK_SHARED;
101 else if (F_WRLCK == fl->fl_type)
102 lock_cmd = CEPH_LOCK_EXCL;
103 else
104 lock_cmd = CEPH_LOCK_UNLOCK;
105
106 err = ceph_lock_message(CEPH_LOCK_FCNTL, op, file, lock_cmd, wait, fl);
107 if (!err) {
108 if ( op != CEPH_MDS_OP_GETFILELOCK ){
109 dout("mds locked, locking locally");
110 err = posix_lock_file(file, fl, NULL);
111 if (err && (CEPH_MDS_OP_SETFILELOCK == op)) {
112 /* undo! This should only happen if
113 * the kernel detects local
114 * deadlock. */
115 ceph_lock_message(CEPH_LOCK_FCNTL, op, file,
116 CEPH_LOCK_UNLOCK, 0, fl);
117 dout("got %d on posix_lock_file, undid lock",
118 err);
119 }
120 }
121
122 } else if (err == -ERESTARTSYS) {
123 dout("undoing lock\n");
124 ceph_lock_message(CEPH_LOCK_FCNTL, op, file,
125 CEPH_LOCK_UNLOCK, 0, fl);
126 }
127 return err;
128}
129
130int ceph_flock(struct file *file, int cmd, struct file_lock *fl)
131{
132 u8 lock_cmd;
133 int err;
134 u8 wait = 1;
135
136 fl->fl_nspid = get_pid(task_tgid(current));
137 dout("ceph_flock, fl_pid:%d", fl->fl_pid);
138
139 /* set wait bit, then clear it out of cmd*/
140 if (cmd & LOCK_NB)
141 wait = 0;
142 cmd = cmd & (LOCK_SH | LOCK_EX | LOCK_UN);
143 /* set command sequence that Ceph wants to see:
144 shared lock, exclusive lock, or unlock */
145 if (LOCK_SH == cmd)
146 lock_cmd = CEPH_LOCK_SHARED;
147 else if (LOCK_EX == cmd)
148 lock_cmd = CEPH_LOCK_EXCL;
149 else
150 lock_cmd = CEPH_LOCK_UNLOCK;
151
152 err = ceph_lock_message(CEPH_LOCK_FLOCK, CEPH_MDS_OP_SETFILELOCK,
153 file, lock_cmd, wait, fl);
154 if (!err) {
155 err = flock_lock_file_wait(file, fl);
156 if (err) {
157 ceph_lock_message(CEPH_LOCK_FLOCK,
158 CEPH_MDS_OP_SETFILELOCK,
159 file, CEPH_LOCK_UNLOCK, 0, fl);
160 dout("got %d on flock_lock_file_wait, undid lock", err);
161 }
162 } else if (err == -ERESTARTSYS) {
163 dout("undoing lock\n");
164 ceph_lock_message(CEPH_LOCK_FLOCK,
165 CEPH_MDS_OP_SETFILELOCK,
166 file, CEPH_LOCK_UNLOCK, 0, fl);
167 }
168 return err;
169}
170
171/**
172 * Must be called with BKL already held. Fills in the passed
173 * counter variables, so you can prepare pagelist metadata before calling
174 * ceph_encode_locks.
175 */
176void ceph_count_locks(struct inode *inode, int *fcntl_count, int *flock_count)
177{
178 struct file_lock *lock;
179
180 *fcntl_count = 0;
181 *flock_count = 0;
182
183 for (lock = inode->i_flock; lock != NULL; lock = lock->fl_next) {
184 if (lock->fl_flags & FL_POSIX)
185 ++(*fcntl_count);
186 else if (lock->fl_flags & FL_FLOCK)
187 ++(*flock_count);
188 }
189 dout("counted %d flock locks and %d fcntl locks",
190 *flock_count, *fcntl_count);
191}
192
193/**
194 * Encode the flock and fcntl locks for the given inode into the pagelist.
195 * Format is: #fcntl locks, sequential fcntl locks, #flock locks,
196 * sequential flock locks.
197 * Must be called with lock_flocks() already held.
198 * If we encounter more of a specific lock type than expected,
199 * we return the value 1.
200 */
201int ceph_encode_locks(struct inode *inode, struct ceph_pagelist *pagelist,
202 int num_fcntl_locks, int num_flock_locks)
203{
204 struct file_lock *lock;
205 struct ceph_filelock cephlock;
206 int err = 0;
207 int seen_fcntl = 0;
208 int seen_flock = 0;
209
210 dout("encoding %d flock and %d fcntl locks", num_flock_locks,
211 num_fcntl_locks);
212 err = ceph_pagelist_append(pagelist, &num_fcntl_locks, sizeof(u32));
213 if (err)
214 goto fail;
215 for (lock = inode->i_flock; lock != NULL; lock = lock->fl_next) {
216 if (lock->fl_flags & FL_POSIX) {
217 ++seen_fcntl;
218 if (seen_fcntl > num_fcntl_locks) {
219 err = -ENOSPC;
220 goto fail;
221 }
222 err = lock_to_ceph_filelock(lock, &cephlock);
223 if (err)
224 goto fail;
225 err = ceph_pagelist_append(pagelist, &cephlock,
226 sizeof(struct ceph_filelock));
227 }
228 if (err)
229 goto fail;
230 }
231
232 err = ceph_pagelist_append(pagelist, &num_flock_locks, sizeof(u32));
233 if (err)
234 goto fail;
235 for (lock = inode->i_flock; lock != NULL; lock = lock->fl_next) {
236 if (lock->fl_flags & FL_FLOCK) {
237 ++seen_flock;
238 if (seen_flock > num_flock_locks) {
239 err = -ENOSPC;
240 goto fail;
241 }
242 err = lock_to_ceph_filelock(lock, &cephlock);
243 if (err)
244 goto fail;
245 err = ceph_pagelist_append(pagelist, &cephlock,
246 sizeof(struct ceph_filelock));
247 }
248 if (err)
249 goto fail;
250 }
251fail:
252 return err;
253}
254
255/*
256 * Given a pointer to a lock, convert it to a ceph filelock
257 */
258int lock_to_ceph_filelock(struct file_lock *lock,
259 struct ceph_filelock *cephlock)
260{
261 int err = 0;
262
263 cephlock->start = cpu_to_le64(lock->fl_start);
264 cephlock->length = cpu_to_le64(lock->fl_end - lock->fl_start + 1);
265 cephlock->client = cpu_to_le64(0);
266 cephlock->pid = cpu_to_le64(lock->fl_pid);
267 cephlock->pid_namespace =
268 cpu_to_le64((u64)(unsigned long)lock->fl_nspid);
269
270 switch (lock->fl_type) {
271 case F_RDLCK:
272 cephlock->type = CEPH_LOCK_SHARED;
273 break;
274 case F_WRLCK:
275 cephlock->type = CEPH_LOCK_EXCL;
276 break;
277 case F_UNLCK:
278 cephlock->type = CEPH_LOCK_UNLOCK;
279 break;
280 default:
281 dout("Have unknown lock type %d", lock->fl_type);
282 err = -EINVAL;
283 }
284
285 return err;
286}
1// SPDX-License-Identifier: GPL-2.0
2#include <linux/ceph/ceph_debug.h>
3
4#include <linux/file.h>
5#include <linux/namei.h>
6#include <linux/random.h>
7
8#include "super.h"
9#include "mds_client.h"
10#include <linux/ceph/pagelist.h>
11
12static u64 lock_secret;
13static int ceph_lock_wait_for_completion(struct ceph_mds_client *mdsc,
14 struct ceph_mds_request *req);
15
16static 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
28void __init ceph_flock_init(void)
29{
30 get_random_bytes(&lock_secret, sizeof(lock_secret));
31}
32
33static void ceph_fl_copy_lock(struct file_lock *dst, struct file_lock *src)
34{
35 struct inode *inode = file_inode(dst->fl_file);
36 atomic_inc(&ceph_inode(inode)->i_filelock_ref);
37 dst->fl_u.ceph.inode = igrab(inode);
38}
39
40/*
41 * Do not use the 'fl->fl_file' in release function, which
42 * is possibly already released by another thread.
43 */
44static void ceph_fl_release_lock(struct file_lock *fl)
45{
46 struct inode *inode = fl->fl_u.ceph.inode;
47 struct ceph_inode_info *ci;
48
49 /*
50 * If inode is NULL it should be a request file_lock,
51 * nothing we can do.
52 */
53 if (!inode)
54 return;
55
56 ci = ceph_inode(inode);
57 if (atomic_dec_and_test(&ci->i_filelock_ref)) {
58 /* clear error when all locks are released */
59 spin_lock(&ci->i_ceph_lock);
60 ci->i_ceph_flags &= ~CEPH_I_ERROR_FILELOCK;
61 spin_unlock(&ci->i_ceph_lock);
62 }
63 fl->fl_u.ceph.inode = NULL;
64 iput(inode);
65}
66
67static const struct file_lock_operations ceph_fl_lock_ops = {
68 .fl_copy_lock = ceph_fl_copy_lock,
69 .fl_release_private = ceph_fl_release_lock,
70};
71
72/*
73 * Implement fcntl and flock locking functions.
74 */
75static int ceph_lock_message(u8 lock_type, u16 operation, struct inode *inode,
76 int cmd, u8 wait, struct file_lock *fl)
77{
78 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb);
79 struct ceph_mds_request *req;
80 int err;
81 u64 length = 0;
82 u64 owner;
83
84 if (operation == CEPH_MDS_OP_SETFILELOCK) {
85 /*
86 * increasing i_filelock_ref closes race window between
87 * handling request reply and adding file_lock struct to
88 * inode. Otherwise, auth caps may get trimmed in the
89 * window. Caller function will decrease the counter.
90 */
91 fl->fl_ops = &ceph_fl_lock_ops;
92 fl->fl_ops->fl_copy_lock(fl, NULL);
93 }
94
95 if (operation != CEPH_MDS_OP_SETFILELOCK || cmd == CEPH_LOCK_UNLOCK)
96 wait = 0;
97
98 req = ceph_mdsc_create_request(mdsc, operation, USE_AUTH_MDS);
99 if (IS_ERR(req))
100 return PTR_ERR(req);
101 req->r_inode = inode;
102 ihold(inode);
103 req->r_num_caps = 1;
104
105 /* mds requires start and length rather than start and end */
106 if (LLONG_MAX == fl->fl_end)
107 length = 0;
108 else
109 length = fl->fl_end - fl->fl_start + 1;
110
111 owner = secure_addr(fl->fl_owner);
112
113 dout("ceph_lock_message: rule: %d, op: %d, owner: %llx, pid: %llu, "
114 "start: %llu, length: %llu, wait: %d, type: %d\n", (int)lock_type,
115 (int)operation, owner, (u64)fl->fl_pid, fl->fl_start, length,
116 wait, fl->fl_type);
117
118 req->r_args.filelock_change.rule = lock_type;
119 req->r_args.filelock_change.type = cmd;
120 req->r_args.filelock_change.owner = cpu_to_le64(owner);
121 req->r_args.filelock_change.pid = cpu_to_le64((u64)fl->fl_pid);
122 req->r_args.filelock_change.start = cpu_to_le64(fl->fl_start);
123 req->r_args.filelock_change.length = cpu_to_le64(length);
124 req->r_args.filelock_change.wait = wait;
125
126 err = ceph_mdsc_submit_request(mdsc, inode, req);
127 if (!err)
128 err = ceph_mdsc_wait_request(mdsc, req, wait ?
129 ceph_lock_wait_for_completion : NULL);
130 if (!err && operation == CEPH_MDS_OP_GETFILELOCK) {
131 fl->fl_pid = -le64_to_cpu(req->r_reply_info.filelock_reply->pid);
132 if (CEPH_LOCK_SHARED == req->r_reply_info.filelock_reply->type)
133 fl->fl_type = F_RDLCK;
134 else if (CEPH_LOCK_EXCL == req->r_reply_info.filelock_reply->type)
135 fl->fl_type = F_WRLCK;
136 else
137 fl->fl_type = F_UNLCK;
138
139 fl->fl_start = le64_to_cpu(req->r_reply_info.filelock_reply->start);
140 length = le64_to_cpu(req->r_reply_info.filelock_reply->start) +
141 le64_to_cpu(req->r_reply_info.filelock_reply->length);
142 if (length >= 1)
143 fl->fl_end = length -1;
144 else
145 fl->fl_end = 0;
146
147 }
148 ceph_mdsc_put_request(req);
149 dout("ceph_lock_message: rule: %d, op: %d, pid: %llu, start: %llu, "
150 "length: %llu, wait: %d, type: %d, err code %d\n", (int)lock_type,
151 (int)operation, (u64)fl->fl_pid, fl->fl_start,
152 length, wait, fl->fl_type, err);
153 return err;
154}
155
156static int ceph_lock_wait_for_completion(struct ceph_mds_client *mdsc,
157 struct ceph_mds_request *req)
158{
159 struct ceph_mds_request *intr_req;
160 struct inode *inode = req->r_inode;
161 int err, lock_type;
162
163 BUG_ON(req->r_op != CEPH_MDS_OP_SETFILELOCK);
164 if (req->r_args.filelock_change.rule == CEPH_LOCK_FCNTL)
165 lock_type = CEPH_LOCK_FCNTL_INTR;
166 else if (req->r_args.filelock_change.rule == CEPH_LOCK_FLOCK)
167 lock_type = CEPH_LOCK_FLOCK_INTR;
168 else
169 BUG_ON(1);
170 BUG_ON(req->r_args.filelock_change.type == CEPH_LOCK_UNLOCK);
171
172 err = wait_for_completion_interruptible(&req->r_completion);
173 if (!err)
174 return 0;
175
176 dout("ceph_lock_wait_for_completion: request %llu was interrupted\n",
177 req->r_tid);
178
179 mutex_lock(&mdsc->mutex);
180 if (test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags)) {
181 err = 0;
182 } else {
183 /*
184 * ensure we aren't running concurrently with
185 * ceph_fill_trace or ceph_readdir_prepopulate, which
186 * rely on locks (dir mutex) held by our caller.
187 */
188 mutex_lock(&req->r_fill_mutex);
189 req->r_err = err;
190 set_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags);
191 mutex_unlock(&req->r_fill_mutex);
192
193 if (!req->r_session) {
194 // haven't sent the request
195 err = 0;
196 }
197 }
198 mutex_unlock(&mdsc->mutex);
199 if (!err)
200 return 0;
201
202 intr_req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETFILELOCK,
203 USE_AUTH_MDS);
204 if (IS_ERR(intr_req))
205 return PTR_ERR(intr_req);
206
207 intr_req->r_inode = inode;
208 ihold(inode);
209 intr_req->r_num_caps = 1;
210
211 intr_req->r_args.filelock_change = req->r_args.filelock_change;
212 intr_req->r_args.filelock_change.rule = lock_type;
213 intr_req->r_args.filelock_change.type = CEPH_LOCK_UNLOCK;
214
215 err = ceph_mdsc_do_request(mdsc, inode, intr_req);
216 ceph_mdsc_put_request(intr_req);
217
218 if (err && err != -ERESTARTSYS)
219 return err;
220
221 wait_for_completion_killable(&req->r_safe_completion);
222 return 0;
223}
224
225static int try_unlock_file(struct file *file, struct file_lock *fl)
226{
227 int err;
228 unsigned int orig_flags = fl->fl_flags;
229 fl->fl_flags |= FL_EXISTS;
230 err = locks_lock_file_wait(file, fl);
231 fl->fl_flags = orig_flags;
232 if (err == -ENOENT) {
233 if (!(orig_flags & FL_EXISTS))
234 err = 0;
235 return err;
236 }
237 return 1;
238}
239
240/*
241 * Attempt to set an fcntl lock.
242 * For now, this just goes away to the server. Later it may be more awesome.
243 */
244int ceph_lock(struct file *file, int cmd, struct file_lock *fl)
245{
246 struct inode *inode = file_inode(file);
247 struct ceph_inode_info *ci = ceph_inode(inode);
248 int err = 0;
249 u16 op = CEPH_MDS_OP_SETFILELOCK;
250 u8 wait = 0;
251 u8 lock_cmd;
252
253 if (!(fl->fl_flags & FL_POSIX))
254 return -ENOLCK;
255
256 if (ceph_inode_is_shutdown(inode))
257 return -ESTALE;
258
259 dout("ceph_lock, fl_owner: %p\n", fl->fl_owner);
260
261 /* set wait bit as appropriate, then make command as Ceph expects it*/
262 if (IS_GETLK(cmd))
263 op = CEPH_MDS_OP_GETFILELOCK;
264 else if (IS_SETLKW(cmd))
265 wait = 1;
266
267 spin_lock(&ci->i_ceph_lock);
268 if (ci->i_ceph_flags & CEPH_I_ERROR_FILELOCK) {
269 err = -EIO;
270 }
271 spin_unlock(&ci->i_ceph_lock);
272 if (err < 0) {
273 if (op == CEPH_MDS_OP_SETFILELOCK && F_UNLCK == fl->fl_type)
274 posix_lock_file(file, fl, NULL);
275 return err;
276 }
277
278 if (F_RDLCK == fl->fl_type)
279 lock_cmd = CEPH_LOCK_SHARED;
280 else if (F_WRLCK == fl->fl_type)
281 lock_cmd = CEPH_LOCK_EXCL;
282 else
283 lock_cmd = CEPH_LOCK_UNLOCK;
284
285 if (op == CEPH_MDS_OP_SETFILELOCK && F_UNLCK == fl->fl_type) {
286 err = try_unlock_file(file, fl);
287 if (err <= 0)
288 return err;
289 }
290
291 err = ceph_lock_message(CEPH_LOCK_FCNTL, op, inode, lock_cmd, wait, fl);
292 if (!err) {
293 if (op == CEPH_MDS_OP_SETFILELOCK && F_UNLCK != fl->fl_type) {
294 dout("mds locked, locking locally\n");
295 err = posix_lock_file(file, fl, NULL);
296 if (err) {
297 /* undo! This should only happen if
298 * the kernel detects local
299 * deadlock. */
300 ceph_lock_message(CEPH_LOCK_FCNTL, op, inode,
301 CEPH_LOCK_UNLOCK, 0, fl);
302 dout("got %d on posix_lock_file, undid lock\n",
303 err);
304 }
305 }
306 }
307 return err;
308}
309
310int ceph_flock(struct file *file, int cmd, struct file_lock *fl)
311{
312 struct inode *inode = file_inode(file);
313 struct ceph_inode_info *ci = ceph_inode(inode);
314 int err = 0;
315 u8 wait = 0;
316 u8 lock_cmd;
317
318 if (!(fl->fl_flags & FL_FLOCK))
319 return -ENOLCK;
320
321 if (ceph_inode_is_shutdown(inode))
322 return -ESTALE;
323
324 dout("ceph_flock, fl_file: %p\n", fl->fl_file);
325
326 spin_lock(&ci->i_ceph_lock);
327 if (ci->i_ceph_flags & CEPH_I_ERROR_FILELOCK) {
328 err = -EIO;
329 }
330 spin_unlock(&ci->i_ceph_lock);
331 if (err < 0) {
332 if (F_UNLCK == fl->fl_type)
333 locks_lock_file_wait(file, fl);
334 return err;
335 }
336
337 if (IS_SETLKW(cmd))
338 wait = 1;
339
340 if (F_RDLCK == fl->fl_type)
341 lock_cmd = CEPH_LOCK_SHARED;
342 else if (F_WRLCK == fl->fl_type)
343 lock_cmd = CEPH_LOCK_EXCL;
344 else
345 lock_cmd = CEPH_LOCK_UNLOCK;
346
347 if (F_UNLCK == fl->fl_type) {
348 err = try_unlock_file(file, fl);
349 if (err <= 0)
350 return err;
351 }
352
353 err = ceph_lock_message(CEPH_LOCK_FLOCK, CEPH_MDS_OP_SETFILELOCK,
354 inode, lock_cmd, wait, fl);
355 if (!err && F_UNLCK != fl->fl_type) {
356 err = locks_lock_file_wait(file, fl);
357 if (err) {
358 ceph_lock_message(CEPH_LOCK_FLOCK,
359 CEPH_MDS_OP_SETFILELOCK,
360 inode, CEPH_LOCK_UNLOCK, 0, fl);
361 dout("got %d on locks_lock_file_wait, undid lock\n", err);
362 }
363 }
364 return err;
365}
366
367/*
368 * Fills in the passed counter variables, so you can prepare pagelist metadata
369 * before calling ceph_encode_locks.
370 */
371void ceph_count_locks(struct inode *inode, int *fcntl_count, int *flock_count)
372{
373 struct file_lock *lock;
374 struct file_lock_context *ctx;
375
376 *fcntl_count = 0;
377 *flock_count = 0;
378
379 ctx = locks_inode_context(inode);
380 if (ctx) {
381 spin_lock(&ctx->flc_lock);
382 list_for_each_entry(lock, &ctx->flc_posix, fl_list)
383 ++(*fcntl_count);
384 list_for_each_entry(lock, &ctx->flc_flock, fl_list)
385 ++(*flock_count);
386 spin_unlock(&ctx->flc_lock);
387 }
388 dout("counted %d flock locks and %d fcntl locks\n",
389 *flock_count, *fcntl_count);
390}
391
392/*
393 * Given a pointer to a lock, convert it to a ceph filelock
394 */
395static int lock_to_ceph_filelock(struct file_lock *lock,
396 struct ceph_filelock *cephlock)
397{
398 int err = 0;
399 cephlock->start = cpu_to_le64(lock->fl_start);
400 cephlock->length = cpu_to_le64(lock->fl_end - lock->fl_start + 1);
401 cephlock->client = cpu_to_le64(0);
402 cephlock->pid = cpu_to_le64((u64)lock->fl_pid);
403 cephlock->owner = cpu_to_le64(secure_addr(lock->fl_owner));
404
405 switch (lock->fl_type) {
406 case F_RDLCK:
407 cephlock->type = CEPH_LOCK_SHARED;
408 break;
409 case F_WRLCK:
410 cephlock->type = CEPH_LOCK_EXCL;
411 break;
412 case F_UNLCK:
413 cephlock->type = CEPH_LOCK_UNLOCK;
414 break;
415 default:
416 dout("Have unknown lock type %d\n", lock->fl_type);
417 err = -EINVAL;
418 }
419
420 return err;
421}
422
423/*
424 * Encode the flock and fcntl locks for the given inode into the ceph_filelock
425 * array. Must be called with inode->i_lock already held.
426 * If we encounter more of a specific lock type than expected, return -ENOSPC.
427 */
428int ceph_encode_locks_to_buffer(struct inode *inode,
429 struct ceph_filelock *flocks,
430 int num_fcntl_locks, int num_flock_locks)
431{
432 struct file_lock *lock;
433 struct file_lock_context *ctx = locks_inode_context(inode);
434 int err = 0;
435 int seen_fcntl = 0;
436 int seen_flock = 0;
437 int l = 0;
438
439 dout("encoding %d flock and %d fcntl locks\n", num_flock_locks,
440 num_fcntl_locks);
441
442 if (!ctx)
443 return 0;
444
445 spin_lock(&ctx->flc_lock);
446 list_for_each_entry(lock, &ctx->flc_posix, fl_list) {
447 ++seen_fcntl;
448 if (seen_fcntl > num_fcntl_locks) {
449 err = -ENOSPC;
450 goto fail;
451 }
452 err = lock_to_ceph_filelock(lock, &flocks[l]);
453 if (err)
454 goto fail;
455 ++l;
456 }
457 list_for_each_entry(lock, &ctx->flc_flock, fl_list) {
458 ++seen_flock;
459 if (seen_flock > num_flock_locks) {
460 err = -ENOSPC;
461 goto fail;
462 }
463 err = lock_to_ceph_filelock(lock, &flocks[l]);
464 if (err)
465 goto fail;
466 ++l;
467 }
468fail:
469 spin_unlock(&ctx->flc_lock);
470 return err;
471}
472
473/*
474 * Copy the encoded flock and fcntl locks into the pagelist.
475 * Format is: #fcntl locks, sequential fcntl locks, #flock locks,
476 * sequential flock locks.
477 * Returns zero on success.
478 */
479int ceph_locks_to_pagelist(struct ceph_filelock *flocks,
480 struct ceph_pagelist *pagelist,
481 int num_fcntl_locks, int num_flock_locks)
482{
483 int err = 0;
484 __le32 nlocks;
485
486 nlocks = cpu_to_le32(num_fcntl_locks);
487 err = ceph_pagelist_append(pagelist, &nlocks, sizeof(nlocks));
488 if (err)
489 goto out_fail;
490
491 if (num_fcntl_locks > 0) {
492 err = ceph_pagelist_append(pagelist, flocks,
493 num_fcntl_locks * sizeof(*flocks));
494 if (err)
495 goto out_fail;
496 }
497
498 nlocks = cpu_to_le32(num_flock_locks);
499 err = ceph_pagelist_append(pagelist, &nlocks, sizeof(nlocks));
500 if (err)
501 goto out_fail;
502
503 if (num_flock_locks > 0) {
504 err = ceph_pagelist_append(pagelist, &flocks[num_fcntl_locks],
505 num_flock_locks * sizeof(*flocks));
506 }
507out_fail:
508 return err;
509}