From eb13e832f823f6c110ea53e3067bafe22b87de63 Mon Sep 17 00:00:00 2001 From: "Yan, Zheng" Date: Sun, 9 Mar 2014 23:16:40 +0800 Subject: ceph: use fl->fl_file as owner identifier of flock and posix lock 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, but it also can be a customized value). 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. We also set the most significant bit of the 'owner' field. MDS can use that bit to distinguish between old and new clients. The MDS counterpart of this patch modifies the flock code to not take the 'pid_namespace' into consideration when checking conflict locks. Signed-off-by: Yan, Zheng Reviewed-by: Sage Weil --- fs/ceph/locks.c | 61 ++++++++++++++++++++++++++++++++++++++------------------- fs/ceph/super.c | 1 + fs/ceph/super.h | 1 + 3 files changed, 43 insertions(+), 20 deletions(-) (limited to 'fs/ceph') diff --git a/fs/ceph/locks.c b/fs/ceph/locks.c index f91a569a20fb..d94ba0df9f4d 100644 --- a/fs/ceph/locks.c +++ b/fs/ceph/locks.c @@ -2,11 +2,31 @@ #include #include +#include #include "super.h" #include "mds_client.h" #include +static u64 lock_secret; + +static inline u64 secure_addr(void *addr) +{ + u64 v = lock_secret ^ (u64)(unsigned long)addr; + /* + * Set the most significant bit, so that MDS knows the 'owner' + * is sufficient to identify the owner of lock. (old code uses + * both 'owner' and 'pid') + */ + v |= (1ULL << 63); + return v; +} + +void __init ceph_flock_init(void) +{ + get_random_bytes(&lock_secret, sizeof(lock_secret)); +} + /** * Implement fcntl and flock locking functions. */ @@ -14,11 +34,11 @@ 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; int err; u64 length = 0; + u64 owner; req = ceph_mdsc_create_request(mdsc, operation, USE_AUTH_MDS); if (IS_ERR(req)) @@ -32,25 +52,27 @@ 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 = secure_addr(fl->fl_owner); + else + owner = secure_addr(fl->fl_file); + + dout("ceph_lock_message: rule: %d, op: %d, owner: %llx, 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(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 +115,7 @@ 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 +132,7 @@ 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 +166,7 @@ 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 +309,14 @@ 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(secure_addr(lock->fl_owner)); + else + cephlock->owner = cpu_to_le64(secure_addr(lock->fl_file)); switch (lock->fl_type) { case F_RDLCK: diff --git a/fs/ceph/super.c b/fs/ceph/super.c index 10a4ccbf38da..06150fd745ac 100644 --- a/fs/ceph/super.c +++ b/fs/ceph/super.c @@ -1026,6 +1026,7 @@ static int __init init_ceph(void) if (ret) goto out; + ceph_flock_init(); ceph_xattr_init(); ret = register_filesystem(&ceph_fs_type); if (ret) diff --git a/fs/ceph/super.h b/fs/ceph/super.h index 70bb183385b7..7866cd05a6bb 100644 --- a/fs/ceph/super.h +++ b/fs/ceph/super.h @@ -871,6 +871,7 @@ extern long ceph_ioctl(struct file *file, unsigned int cmd, unsigned long arg); extern const struct export_operations ceph_export_ops; /* locks.c */ +extern __init void ceph_flock_init(void); extern int ceph_lock(struct file *file, int cmd, struct file_lock *fl); extern int ceph_flock(struct file *file, int cmd, struct file_lock *fl); extern void ceph_count_locks(struct inode *inode, int *p_num, int *f_num); -- cgit v1.2.2