Commit | Line | Data |
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3d14c5d2 | 1 | #include <linux/ceph/ceph_debug.h> |
40819f6f GF |
2 | |
3 | #include <linux/file.h> | |
4 | #include <linux/namei.h> | |
5 | ||
6 | #include "super.h" | |
7 | #include "mds_client.h" | |
3d14c5d2 | 8 | #include <linux/ceph/pagelist.h> |
40819f6f GF |
9 | |
10 | /** | |
11 | * Implement fcntl and flock locking functions. | |
12 | */ | |
13 | static int ceph_lock_message(u8 lock_type, u16 operation, struct file *file, | |
637ae8d5 | 14 | int cmd, u8 wait, struct file_lock *fl) |
40819f6f GF |
15 | { |
16 | struct inode *inode = file->f_dentry->d_inode; | |
17 | struct ceph_mds_client *mdsc = | |
3d14c5d2 | 18 | ceph_sb_to_client(inode->i_sb)->mdsc; |
40819f6f GF |
19 | struct ceph_mds_request *req; |
20 | int err; | |
637ae8d5 | 21 | u64 length = 0; |
40819f6f GF |
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 = igrab(inode); | |
27 | ||
637ae8d5 HS |
28 | /* mds requires start and length rather than start and end */ |
29 | if (LLONG_MAX == fl->fl_end) | |
30 | length = 0; | |
31 | else | |
32 | length = fl->fl_end - fl->fl_start + 1; | |
33 | ||
40819f6f GF |
34 | dout("ceph_lock_message: rule: %d, op: %d, pid: %llu, start: %llu, " |
35 | "length: %llu, wait: %d, type`: %d", (int)lock_type, | |
637ae8d5 HS |
36 | (int)operation, (u64)fl->fl_pid, fl->fl_start, |
37 | length, wait, fl->fl_type); | |
38 | ||
40819f6f GF |
39 | |
40 | req->r_args.filelock_change.rule = lock_type; | |
41 | req->r_args.filelock_change.type = cmd; | |
637ae8d5 | 42 | req->r_args.filelock_change.pid = cpu_to_le64((u64)fl->fl_pid); |
40819f6f GF |
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 = | |
637ae8d5 HS |
46 | cpu_to_le64((u64)(unsigned long)fl->fl_nspid); |
47 | req->r_args.filelock_change.start = cpu_to_le64(fl->fl_start); | |
40819f6f GF |
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); | |
a5b10629 HS |
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 | } | |
40819f6f GF |
71 | ceph_mdsc_put_request(req); |
72 | dout("ceph_lock_message: rule: %d, op: %d, pid: %llu, start: %llu, " | |
637ae8d5 HS |
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); | |
40819f6f GF |
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 | { | |
40819f6f GF |
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 | ||
637ae8d5 | 106 | err = ceph_lock_message(CEPH_LOCK_FCNTL, op, file, lock_cmd, wait, fl); |
40819f6f | 107 | if (!err) { |
a5b10629 HS |
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 the kernel detects | |
113 | * local deadlock. */ | |
114 | ceph_lock_message(CEPH_LOCK_FCNTL, op, file, | |
115 | CEPH_LOCK_UNLOCK, 0, fl); | |
116 | dout("got %d on posix_lock_file, undid lock", err); | |
117 | } | |
40819f6f | 118 | } |
a5b10629 | 119 | |
40819f6f GF |
120 | } else { |
121 | dout("mds returned error code %d", err); | |
122 | } | |
123 | return err; | |
124 | } | |
125 | ||
126 | int ceph_flock(struct file *file, int cmd, struct file_lock *fl) | |
127 | { | |
40819f6f GF |
128 | u8 lock_cmd; |
129 | int err; | |
130 | u8 wait = 1; | |
131 | ||
132 | fl->fl_nspid = get_pid(task_tgid(current)); | |
133 | dout("ceph_flock, fl_pid:%d", fl->fl_pid); | |
134 | ||
135 | /* set wait bit, then clear it out of cmd*/ | |
136 | if (cmd & LOCK_NB) | |
137 | wait = 0; | |
138 | cmd = cmd & (LOCK_SH | LOCK_EX | LOCK_UN); | |
139 | /* set command sequence that Ceph wants to see: | |
140 | shared lock, exclusive lock, or unlock */ | |
141 | if (LOCK_SH == cmd) | |
142 | lock_cmd = CEPH_LOCK_SHARED; | |
143 | else if (LOCK_EX == cmd) | |
144 | lock_cmd = CEPH_LOCK_EXCL; | |
145 | else | |
146 | lock_cmd = CEPH_LOCK_UNLOCK; | |
40819f6f GF |
147 | |
148 | err = ceph_lock_message(CEPH_LOCK_FLOCK, CEPH_MDS_OP_SETFILELOCK, | |
637ae8d5 | 149 | file, lock_cmd, wait, fl); |
40819f6f GF |
150 | if (!err) { |
151 | err = flock_lock_file_wait(file, fl); | |
152 | if (err) { | |
153 | ceph_lock_message(CEPH_LOCK_FLOCK, | |
154 | CEPH_MDS_OP_SETFILELOCK, | |
637ae8d5 | 155 | file, CEPH_LOCK_UNLOCK, 0, fl); |
40819f6f GF |
156 | dout("got %d on flock_lock_file_wait, undid lock", err); |
157 | } | |
158 | } else { | |
159 | dout("mds error code %d", err); | |
160 | } | |
161 | return err; | |
162 | } | |
163 | ||
164 | /** | |
165 | * Must be called with BKL already held. Fills in the passed | |
166 | * counter variables, so you can prepare pagelist metadata before calling | |
167 | * ceph_encode_locks. | |
168 | */ | |
169 | void ceph_count_locks(struct inode *inode, int *fcntl_count, int *flock_count) | |
170 | { | |
171 | struct file_lock *lock; | |
172 | ||
173 | *fcntl_count = 0; | |
174 | *flock_count = 0; | |
175 | ||
176 | for (lock = inode->i_flock; lock != NULL; lock = lock->fl_next) { | |
177 | if (lock->fl_flags & FL_POSIX) | |
178 | ++(*fcntl_count); | |
179 | else if (lock->fl_flags & FL_FLOCK) | |
180 | ++(*flock_count); | |
181 | } | |
182 | dout("counted %d flock locks and %d fcntl locks", | |
183 | *flock_count, *fcntl_count); | |
184 | } | |
185 | ||
186 | /** | |
187 | * Encode the flock and fcntl locks for the given inode into the pagelist. | |
188 | * Format is: #fcntl locks, sequential fcntl locks, #flock locks, | |
189 | * sequential flock locks. | |
fca4451a GF |
190 | * Must be called with lock_flocks() already held. |
191 | * If we encounter more of a specific lock type than expected, | |
192 | * we return the value 1. | |
40819f6f GF |
193 | */ |
194 | int ceph_encode_locks(struct inode *inode, struct ceph_pagelist *pagelist, | |
195 | int num_fcntl_locks, int num_flock_locks) | |
196 | { | |
197 | struct file_lock *lock; | |
198 | struct ceph_filelock cephlock; | |
199 | int err = 0; | |
fca4451a GF |
200 | int seen_fcntl = 0; |
201 | int seen_flock = 0; | |
40819f6f GF |
202 | |
203 | dout("encoding %d flock and %d fcntl locks", num_flock_locks, | |
204 | num_fcntl_locks); | |
205 | err = ceph_pagelist_append(pagelist, &num_fcntl_locks, sizeof(u32)); | |
206 | if (err) | |
207 | goto fail; | |
208 | for (lock = inode->i_flock; lock != NULL; lock = lock->fl_next) { | |
209 | if (lock->fl_flags & FL_POSIX) { | |
fca4451a GF |
210 | ++seen_fcntl; |
211 | if (seen_fcntl > num_fcntl_locks) { | |
212 | err = -ENOSPC; | |
213 | goto fail; | |
214 | } | |
40819f6f GF |
215 | err = lock_to_ceph_filelock(lock, &cephlock); |
216 | if (err) | |
217 | goto fail; | |
218 | err = ceph_pagelist_append(pagelist, &cephlock, | |
219 | sizeof(struct ceph_filelock)); | |
220 | } | |
221 | if (err) | |
222 | goto fail; | |
223 | } | |
224 | ||
225 | err = ceph_pagelist_append(pagelist, &num_flock_locks, sizeof(u32)); | |
226 | if (err) | |
227 | goto fail; | |
228 | for (lock = inode->i_flock; lock != NULL; lock = lock->fl_next) { | |
229 | if (lock->fl_flags & FL_FLOCK) { | |
fca4451a GF |
230 | ++seen_flock; |
231 | if (seen_flock > num_flock_locks) { | |
232 | err = -ENOSPC; | |
233 | goto fail; | |
234 | } | |
40819f6f GF |
235 | err = lock_to_ceph_filelock(lock, &cephlock); |
236 | if (err) | |
237 | goto fail; | |
238 | err = ceph_pagelist_append(pagelist, &cephlock, | |
239 | sizeof(struct ceph_filelock)); | |
240 | } | |
241 | if (err) | |
242 | goto fail; | |
243 | } | |
244 | fail: | |
245 | return err; | |
246 | } | |
247 | ||
248 | /* | |
249 | * Given a pointer to a lock, convert it to a ceph filelock | |
250 | */ | |
251 | int lock_to_ceph_filelock(struct file_lock *lock, | |
252 | struct ceph_filelock *cephlock) | |
253 | { | |
254 | int err = 0; | |
255 | ||
256 | cephlock->start = cpu_to_le64(lock->fl_start); | |
257 | cephlock->length = cpu_to_le64(lock->fl_end - lock->fl_start + 1); | |
258 | cephlock->client = cpu_to_le64(0); | |
259 | cephlock->pid = cpu_to_le64(lock->fl_pid); | |
ad8453ab AC |
260 | cephlock->pid_namespace = |
261 | cpu_to_le64((u64)(unsigned long)lock->fl_nspid); | |
40819f6f GF |
262 | |
263 | switch (lock->fl_type) { | |
264 | case F_RDLCK: | |
265 | cephlock->type = CEPH_LOCK_SHARED; | |
266 | break; | |
267 | case F_WRLCK: | |
268 | cephlock->type = CEPH_LOCK_EXCL; | |
269 | break; | |
270 | case F_UNLCK: | |
271 | cephlock->type = CEPH_LOCK_UNLOCK; | |
272 | break; | |
273 | default: | |
274 | dout("Have unknown lock type %d", lock->fl_type); | |
275 | err = -EINVAL; | |
276 | } | |
277 | ||
278 | return err; | |
279 | } |