On Mon, 10 Mar 2014, Yan, Zheng wrote: > flock and posix lock should use fl->fl_file instead of process ID > as owner identifier. (posix lock uses fl->fl_owner, fl->fl_owner > is usually equal to fl->fl_file in most cases). The process ID of > who holds the lock is just for F_GETLK fcntl(2). > > The fix is rename the 'pid' fields of struct ceph_mds_request_args > and struct ceph_filelock to 'owner', rename 'pid_namespace' fields > to 'pid'. Assign fl->fl_file to the 'owner' field of lock messages. > > The MDS counterpart of this patch modifies the flock code to not > take the 'pid_namespace' into consideration when checking conflict > locks.
If I'm reading this right, it means the pid is purely informational now. and 'owner' is a raw pointer from the client? That's unique, clearly, but I suspect its a bad idea to share kernel pointers with any remote system? Since this essentially boils down to a unique identifier for the thread group, I wonder if we should opt for a different unique identifier for that. sage > > Signed-off-by: Yan, Zheng <[email protected]> > --- > fs/ceph/locks.c | 44 > ++++++++++++++++++++++++-------------------- > include/linux/ceph/ceph_fs.h | 4 ++-- > 2 files changed, 26 insertions(+), 22 deletions(-) > > diff --git a/fs/ceph/locks.c b/fs/ceph/locks.c > index f91a569a..4857007 100644 > --- a/fs/ceph/locks.c > +++ b/fs/ceph/locks.c > @@ -14,9 +14,9 @@ static int ceph_lock_message(u8 lock_type, u16 operation, > struct file *file, > int cmd, u8 wait, struct file_lock *fl) > { > struct inode *inode = file_inode(file); > - struct ceph_mds_client *mdsc = > - ceph_sb_to_client(inode->i_sb)->mdsc; > + struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc; > struct ceph_mds_request *req; > + void *owner; > int err; > u64 length = 0; > > @@ -32,25 +32,28 @@ static int ceph_lock_message(u8 lock_type, u16 operation, > struct file *file, > 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, (u64)fl->fl_pid, fl->fl_start, > - length, wait, fl->fl_type); > + if (lock_type == CEPH_LOCK_FCNTL) > + owner = fl->fl_owner; > + else > + owner = fl->fl_file; > + > + dout("ceph_lock_message: rule: %d, op: %d, owner: %p, pid: %llu, " > + "start: %llu, length: %llu, wait: %d, type: %d", (int)lock_type, > + (int)operation, owner, (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.owner = > + cpu_to_le64((u64)(unsigned long)owner); > 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)(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){ > + 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; > @@ -93,8 +96,7 @@ int ceph_lock(struct file *file, int cmd, struct file_lock > *fl) > if (__mandatory_lock(file->f_mapping->host) && fl->fl_type != F_UNLCK) > return -ENOLCK; > > - fl->fl_nspid = get_pid(task_tgid(current)); > - dout("ceph_lock, fl_pid:%d", fl->fl_pid); > + dout("ceph_lock, fl_owner: %p", fl->fl_owner); > > /* set wait bit as appropriate, then make command as Ceph expects it*/ > if (IS_GETLK(cmd)) > @@ -111,7 +113,7 @@ int ceph_lock(struct file *file, int cmd, struct > file_lock *fl) > > err = ceph_lock_message(CEPH_LOCK_FCNTL, op, file, lock_cmd, wait, fl); > if (!err) { > - if ( op != CEPH_MDS_OP_GETFILELOCK ){ > + 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)) { > @@ -145,8 +147,7 @@ int ceph_flock(struct file *file, int cmd, struct > file_lock *fl) > if (__mandatory_lock(file->f_mapping->host) && fl->fl_type != F_UNLCK) > return -ENOLCK; > > - fl->fl_nspid = get_pid(task_tgid(current)); > - dout("ceph_flock, fl_pid:%d", fl->fl_pid); > + dout("ceph_flock, fl_file: %p", fl->fl_file); > > if (IS_SETLKW(cmd)) > wait = 1; > @@ -289,13 +290,16 @@ int lock_to_ceph_filelock(struct file_lock *lock, > struct ceph_filelock *cephlock) > { > int err = 0; > - > cephlock->start = cpu_to_le64(lock->fl_start); > cephlock->length = cpu_to_le64(lock->fl_end - lock->fl_start + 1); > cephlock->client = cpu_to_le64(0); > - cephlock->pid = cpu_to_le64(lock->fl_pid); > - cephlock->pid_namespace = > - cpu_to_le64((u64)(unsigned long)lock->fl_nspid); > + cephlock->pid = cpu_to_le64((u64)lock->fl_pid); > + if (lock->fl_flags & FL_POSIX) > + cephlock->owner = > + cpu_to_le64((u64)(unsigned long)lock->fl_owner); > + else > + cephlock->owner = > + cpu_to_le64((u64)(unsigned long)lock->fl_file); > > switch (lock->fl_type) { > case F_RDLCK: > diff --git a/include/linux/ceph/ceph_fs.h b/include/linux/ceph/ceph_fs.h > index 35f345f..5f6db18 100644 > --- a/include/linux/ceph/ceph_fs.h > +++ b/include/linux/ceph/ceph_fs.h > @@ -421,8 +421,8 @@ union ceph_mds_request_args { > struct { > __u8 rule; /* currently fcntl or flock */ > __u8 type; /* shared, exclusive, remove*/ > + __le64 owner; /* owner of the lock */ > __le64 pid; /* process id requesting the lock */ > - __le64 pid_namespace; > __le64 start; /* initial location to lock */ > __le64 length; /* num bytes to lock from start */ > __u8 wait; /* will caller wait for lock to become available? */ > @@ -533,8 +533,8 @@ struct ceph_filelock { > __le64 start;/* file offset to start lock at */ > __le64 length; /* num bytes to lock; 0 for all following start */ > __le64 client; /* which client holds the lock */ > + __le64 owner; /* owner the lock */ > __le64 pid; /* process id holding the lock on the client */ > - __le64 pid_namespace; > __u8 type; /* shared lock, exclusive lock, or unlock */ > } __attribute__ ((packed)); > > -- > 1.8.5.3 > > -- > To unsubscribe from this list: send the line "unsubscribe ceph-devel" in > the body of a message to [email protected] > More majordomo info at http://vger.kernel.org/majordomo-info.html > > -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
