* Implement fcntl and flock locking functions.
*/
static int ceph_lock_message(u8 lock_type, u16 operation, struct file *file,
- u64 pid, u64 pid_ns,
- int cmd, u64 start, u64 length, u8 wait)
+ int cmd, u8 wait, struct file_lock *fl)
{
struct inode *inode = file->f_dentry->d_inode;
struct ceph_mds_client *mdsc =
ceph_sb_to_client(inode->i_sb)->mdsc;
struct ceph_mds_request *req;
int err;
+ u64 length = 0;
req = ceph_mdsc_create_request(mdsc, operation, USE_AUTH_MDS);
if (IS_ERR(req))
return PTR_ERR(req);
req->r_inode = igrab(inode);
+ /* mds requires start and length rather than start and end */
+ if (LLONG_MAX == fl->fl_end)
+ length = 0;
+ else
+ length = fl->fl_end - fl->fl_start + 1;
+
dout("ceph_lock_message: rule: %d, op: %d, pid: %llu, start: %llu, "
"length: %llu, wait: %d, type`: %d", (int)lock_type,
- (int)operation, pid, start, length, wait, cmd);
+ (int)operation, (u64)fl->fl_pid, fl->fl_start,
+ length, wait, fl->fl_type);
+
req->r_args.filelock_change.rule = lock_type;
req->r_args.filelock_change.type = cmd;
- req->r_args.filelock_change.pid = cpu_to_le64(pid);
+ req->r_args.filelock_change.pid = cpu_to_le64((u64)fl->fl_pid);
/* This should be adjusted, but I'm not sure if
namespaces actually get id numbers*/
req->r_args.filelock_change.pid_namespace =
- cpu_to_le64((u64)pid_ns);
- req->r_args.filelock_change.start = cpu_to_le64(start);
+ cpu_to_le64((u64)(unsigned long)fl->fl_nspid);
+ req->r_args.filelock_change.start = cpu_to_le64(fl->fl_start);
req->r_args.filelock_change.length = cpu_to_le64(length);
req->r_args.filelock_change.wait = wait;
err = ceph_mdsc_do_request(mdsc, inode, req);
+
+ if ( operation == CEPH_MDS_OP_GETFILELOCK){
+ fl->fl_pid = le64_to_cpu(req->r_reply_info.filelock_reply->pid);
+ if (CEPH_LOCK_SHARED == req->r_reply_info.filelock_reply->type)
+ fl->fl_type = F_RDLCK;
+ else if (CEPH_LOCK_EXCL == req->r_reply_info.filelock_reply->type)
+ fl->fl_type = F_WRLCK;
+ else
+ fl->fl_type = F_UNLCK;
+
+ fl->fl_start = le64_to_cpu(req->r_reply_info.filelock_reply->start);
+ length = le64_to_cpu(req->r_reply_info.filelock_reply->start) +
+ le64_to_cpu(req->r_reply_info.filelock_reply->length);
+ if (length >= 1)
+ fl->fl_end = length -1;
+ else
+ fl->fl_end = 0;
+
+ }
ceph_mdsc_put_request(req);
dout("ceph_lock_message: rule: %d, op: %d, pid: %llu, start: %llu, "
- "length: %llu, wait: %d, type`: %d err code %d", (int)lock_type,
- (int)operation, pid, start, length, wait, cmd, err);
+ "length: %llu, wait: %d, type`: %d, err code %d", (int)lock_type,
+ (int)operation, (u64)fl->fl_pid, fl->fl_start,
+ length, wait, fl->fl_type, err);
return err;
}
*/
int ceph_lock(struct file *file, int cmd, struct file_lock *fl)
{
- u64 length;
u8 lock_cmd;
int err;
u8 wait = 0;
else
lock_cmd = CEPH_LOCK_UNLOCK;
- if (LLONG_MAX == fl->fl_end)
- length = 0;
- else
- length = fl->fl_end - fl->fl_start + 1;
-
- err = ceph_lock_message(CEPH_LOCK_FCNTL, op, file,
- (u64)fl->fl_pid,
- (u64)(unsigned long)fl->fl_nspid,
- lock_cmd, fl->fl_start,
- length, wait);
+ err = ceph_lock_message(CEPH_LOCK_FCNTL, op, file, lock_cmd, wait, fl);
if (!err) {
- dout("mds locked, locking locally");
- err = posix_lock_file(file, fl, NULL);
- if (err && (CEPH_MDS_OP_SETFILELOCK == op)) {
- /* undo! This should only happen if the kernel detects
- * local deadlock. */
- ceph_lock_message(CEPH_LOCK_FCNTL, op, file,
- (u64)fl->fl_pid,
- (u64)(unsigned long)fl->fl_nspid,
- CEPH_LOCK_UNLOCK, fl->fl_start,
- length, 0);
- dout("got %d on posix_lock_file, undid lock", err);
+ if ( op != CEPH_MDS_OP_GETFILELOCK ){
+ dout("mds locked, locking locally");
+ err = posix_lock_file(file, fl, NULL);
+ if (err && (CEPH_MDS_OP_SETFILELOCK == op)) {
+ /* undo! This should only happen if the kernel detects
+ * local deadlock. */
+ ceph_lock_message(CEPH_LOCK_FCNTL, op, file,
+ CEPH_LOCK_UNLOCK, 0, fl);
+ dout("got %d on posix_lock_file, undid lock", err);
+ }
}
+
} else {
dout("mds returned error code %d", err);
}
int ceph_flock(struct file *file, int cmd, struct file_lock *fl)
{
- u64 length;
u8 lock_cmd;
int err;
u8 wait = 1;
lock_cmd = CEPH_LOCK_EXCL;
else
lock_cmd = CEPH_LOCK_UNLOCK;
- /* mds requires start and length rather than start and end */
- if (LLONG_MAX == fl->fl_end)
- length = 0;
- else
- length = fl->fl_end - fl->fl_start + 1;
err = ceph_lock_message(CEPH_LOCK_FLOCK, CEPH_MDS_OP_SETFILELOCK,
- file, (u64)fl->fl_pid,
- (u64)(unsigned long)fl->fl_nspid,
- lock_cmd, fl->fl_start,
- length, wait);
+ file, lock_cmd, wait, fl);
if (!err) {
err = flock_lock_file_wait(file, fl);
if (err) {
ceph_lock_message(CEPH_LOCK_FLOCK,
CEPH_MDS_OP_SETFILELOCK,
- file, (u64)fl->fl_pid,
- (u64)(unsigned long)fl->fl_nspid,
- CEPH_LOCK_UNLOCK, fl->fl_start,
- length, 0);
+ file, CEPH_LOCK_UNLOCK, 0, fl);
dout("got %d on flock_lock_file_wait, undid lock", err);
}
} else {
return err;
}
+/*
+ * parse fcntl F_GETLK results
+ */
+static int parse_reply_info_filelock(void **p, void *end,
+ struct ceph_mds_reply_info_parsed *info)
+{
+ if (*p + sizeof(*info->filelock_reply) > end)
+ goto bad;
+
+ info->filelock_reply = *p;
+ *p += sizeof(*info->filelock_reply);
+
+ if (unlikely(*p != end))
+ goto bad;
+ return 0;
+
+bad:
+ return -EIO;
+}
+
+/*
+ * parse extra results
+ */
+static int parse_reply_info_extra(void **p, void *end,
+ struct ceph_mds_reply_info_parsed *info)
+{
+ if (info->head->op == CEPH_MDS_OP_GETFILELOCK)
+ return parse_reply_info_filelock(p, end, info);
+ else
+ return parse_reply_info_dir(p, end, info);
+}
+
/*
* parse entire mds reply
*/
goto out_bad;
}
- /* dir content */
+ /* extra */
ceph_decode_32_safe(&p, end, len, bad);
if (len > 0) {
- err = parse_reply_info_dir(&p, p+len, info);
+ err = parse_reply_info_extra(&p, p+len, info);
if (err < 0)
goto out_bad;
}
mutex_lock(&session->s_mutex);
if (err < 0) {
- pr_err("mdsc_handle_reply got corrupt reply mds%d\n", mds);
+ pr_err("mdsc_handle_reply got corrupt reply mds%d(tid:%lld)\n", mds, tid);
ceph_msg_dump(msg);
goto out_err;
}
mutex_lock(&req->r_fill_mutex);
err = ceph_fill_trace(mdsc->fsc->sb, req, req->r_session);
if (err == 0) {
- if (result == 0 && rinfo->dir_nr)
+ if (result == 0 && req->r_op != CEPH_MDS_OP_GETFILELOCK &&
+ rinfo->dir_nr)
ceph_readdir_prepopulate(req, req->r_session);
ceph_unreserve_caps(mdsc, &req->r_caps_reservation);
}
};
/*
- * parsed info about an mds reply, including information about the
- * target inode and/or its parent directory and dentry, and directory
- * contents (for readdir results).
+ * parsed info about an mds reply, including information about
+ * either: 1) the target inode and/or its parent directory and dentry,
+ * and directory contents (for readdir results), or
+ * 2) the file range lock info (for fcntl F_GETLK results).
*/
struct ceph_mds_reply_info_parsed {
struct ceph_mds_reply_head *head;
+ /* trace */
struct ceph_mds_reply_info_in diri, targeti;
struct ceph_mds_reply_dirfrag *dirfrag;
char *dname;
u32 dname_len;
struct ceph_mds_reply_lease *dlease;
- struct ceph_mds_reply_dirfrag *dir_dir;
- int dir_nr;
- char **dir_dname;
- u32 *dir_dname_len;
- struct ceph_mds_reply_lease **dir_dlease;
- struct ceph_mds_reply_info_in *dir_in;
- u8 dir_complete, dir_end;
+ /* extra */
+ union {
+ /* for fcntl F_GETLK results */
+ struct ceph_filelock *filelock_reply;
+
+ /* for readdir results */
+ struct {
+ struct ceph_mds_reply_dirfrag *dir_dir;
+ int dir_nr;
+ char **dir_dname;
+ u32 *dir_dname_len;
+ struct ceph_mds_reply_lease **dir_dlease;
+ struct ceph_mds_reply_info_in *dir_in;
+ u8 dir_complete, dir_end;
+ };
+ };
/* encoded blob describing snapshot contexts for certain
operations (e.g., open) */
projects / karo-tx-linux.git / commitdiff