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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}
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}