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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 | */ |
13 | static 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 | */ |
83 | int 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 | |
130 | int 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 | */ |
176 | void 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 | */ |
201 | int 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 | } |
251 | fail: |
252 | return err; |
253 | } |
254 | |
255 | /* |
256 | * Given a pointer to a lock, convert it to a ceph filelock |
257 | */ |
258 | int 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 | } |
287 |
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