1 #include <linux/ceph/ceph_debug.h>
3 #include <linux/file.h>
4 #include <linux/namei.h>
7 #include "mds_client.h"
8 #include <linux/ceph/pagelist.h>
11 * Implement fcntl and flock locking functions.
13 static int ceph_lock_message(u8 lock_type, u16 operation, struct file *file,
14 int cmd, u8 wait, struct file_lock *fl)
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;
23 req = ceph_mdsc_create_request(mdsc, operation, USE_AUTH_MDS);
29 /* mds requires start and length rather than start and end */
30 if (LLONG_MAX == fl->fl_end)
33 length = fl->fl_end - fl->fl_start + 1;
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);
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;
51 err = ceph_mdsc_do_request(mdsc, inode, req);
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;
60 fl->fl_type = F_UNLCK;
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);
66 fl->fl_end = length -1;
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);
80 * Attempt to set an fcntl lock.
81 * For now, this just goes away to the server. Later it may be more awesome.
83 int ceph_lock(struct file *file, int cmd, struct file_lock *fl)
88 u16 op = CEPH_MDS_OP_SETFILELOCK;
90 fl->fl_nspid = get_pid(task_tgid(current));
91 dout("ceph_lock, fl_pid:%d", fl->fl_pid);
93 /* set wait bit as appropriate, then make command as Ceph expects it*/
97 op = CEPH_MDS_OP_GETFILELOCK;
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;
104 lock_cmd = CEPH_LOCK_UNLOCK;
106 err = ceph_lock_message(CEPH_LOCK_FCNTL, op, file, lock_cmd, wait, fl);
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
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",
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);
130 int ceph_flock(struct file *file, int cmd, struct file_lock *fl)
136 fl->fl_nspid = get_pid(task_tgid(current));
137 dout("ceph_flock, fl_pid:%d", fl->fl_pid);
139 /* set wait bit, then clear it out of cmd*/
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 */
146 lock_cmd = CEPH_LOCK_SHARED;
147 else if (LOCK_EX == cmd)
148 lock_cmd = CEPH_LOCK_EXCL;
150 lock_cmd = CEPH_LOCK_UNLOCK;
152 err = ceph_lock_message(CEPH_LOCK_FLOCK, CEPH_MDS_OP_SETFILELOCK,
153 file, lock_cmd, wait, fl);
155 err = flock_lock_file_wait(file, fl);
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);
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);
172 * Must be called with BKL already held. Fills in the passed
173 * counter variables, so you can prepare pagelist metadata before calling
176 void ceph_count_locks(struct inode *inode, int *fcntl_count, int *flock_count)
178 struct file_lock *lock;
183 for (lock = inode->i_flock; lock != NULL; lock = lock->fl_next) {
184 if (lock->fl_flags & FL_POSIX)
186 else if (lock->fl_flags & FL_FLOCK)
189 dout("counted %d flock locks and %d fcntl locks",
190 *flock_count, *fcntl_count);
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.
201 int ceph_encode_locks(struct inode *inode, struct ceph_pagelist *pagelist,
202 int num_fcntl_locks, int num_flock_locks)
204 struct file_lock *lock;
205 struct ceph_filelock cephlock;
210 dout("encoding %d flock and %d fcntl locks", num_flock_locks,
212 err = ceph_pagelist_append(pagelist, &num_fcntl_locks, sizeof(u32));
215 for (lock = inode->i_flock; lock != NULL; lock = lock->fl_next) {
216 if (lock->fl_flags & FL_POSIX) {
218 if (seen_fcntl > num_fcntl_locks) {
222 err = lock_to_ceph_filelock(lock, &cephlock);
225 err = ceph_pagelist_append(pagelist, &cephlock,
226 sizeof(struct ceph_filelock));
232 err = ceph_pagelist_append(pagelist, &num_flock_locks, sizeof(u32));
235 for (lock = inode->i_flock; lock != NULL; lock = lock->fl_next) {
236 if (lock->fl_flags & FL_FLOCK) {
238 if (seen_flock > num_flock_locks) {
242 err = lock_to_ceph_filelock(lock, &cephlock);
245 err = ceph_pagelist_append(pagelist, &cephlock,
246 sizeof(struct ceph_filelock));
256 * Given a pointer to a lock, convert it to a ceph filelock
258 int lock_to_ceph_filelock(struct file_lock *lock,
259 struct ceph_filelock *cephlock)
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);
270 switch (lock->fl_type) {
272 cephlock->type = CEPH_LOCK_SHARED;
275 cephlock->type = CEPH_LOCK_EXCL;
278 cephlock->type = CEPH_LOCK_UNLOCK;
281 dout("Have unknown lock type %d", lock->fl_type);