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authorJeff Layton <jlayton@poochiereds.net>2016-05-24 06:27:44 -0400
committerSteve French <smfrench@gmail.com>2016-06-23 23:44:44 -0500
commit3d22462ae915743f3be5bf1ab3d4a6b72c2bb6c9 (patch)
treec72abbba49e16521c490a8981282dc5919eee402 /fs
parentda01e18a37a57f360222d3a123b8f6994aa1ad14 (diff)
downloadlinux-3d22462ae915743f3be5bf1ab3d4a6b72c2bb6c9.tar.gz
cifs: stuff the fl_owner into "pid" field in the lock request
Right now, we send the tgid cross the wire. What we really want to send though is a hashed fl_owner_t since samba treats this field as a generic lockowner. It turns out that because we enforce and release locks locally before they are ever sent to the server, this patch makes no difference in behavior. Still, setting OFD locks on the server using the process pid seems wrong, so I think this patch still makes sense. Signed-off-by: Jeff Layton <jlayton@poochiereds.net> Signed-off-by: Steve French <smfrench@gmail.com> Acked-by: Pavel Shilovsky <pshilovsky@samba.org> Acked-by: Sachin Prabhu <sprabhu@redhat.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/cifs/cifsfs.c3
-rw-r--r--fs/cifs/cifsglob.h1
-rw-r--r--fs/cifs/file.c14
3 files changed, 15 insertions, 3 deletions
diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
index 5d8b7edf8a8f..5d841f39c4b7 100644
--- a/fs/cifs/cifsfs.c
+++ b/fs/cifs/cifsfs.c
@@ -87,6 +87,7 @@ extern mempool_t *cifs_req_poolp;
extern mempool_t *cifs_mid_poolp;
struct workqueue_struct *cifsiod_wq;
+__u32 cifs_lock_secret;
/*
* Bumps refcount for cifs super block.
@@ -1266,6 +1267,8 @@ init_cifs(void)
spin_lock_init(&cifs_file_list_lock);
spin_lock_init(&GlobalMid_Lock);
+ get_random_bytes(&cifs_lock_secret, sizeof(cifs_lock_secret));
+
if (cifs_max_pending < 2) {
cifs_max_pending = 2;
cifs_dbg(FYI, "cifs_max_pending set to min of 2\n");
diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index bba106cdc43c..8f1d8c1e72be 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -1619,6 +1619,7 @@ void cifs_oplock_break(struct work_struct *work);
extern const struct slow_work_ops cifs_oplock_break_ops;
extern struct workqueue_struct *cifsiod_wq;
+extern __u32 cifs_lock_secret;
extern mempool_t *cifs_mid_poolp;
diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index 9793ae0bcaa2..d4890b6dc22d 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -1112,6 +1112,12 @@ cifs_push_mandatory_locks(struct cifsFileInfo *cfile)
return rc;
}
+static __u32
+hash_lockowner(fl_owner_t owner)
+{
+ return cifs_lock_secret ^ hash32_ptr((const void *)owner);
+}
+
struct lock_to_push {
struct list_head llist;
__u64 offset;
@@ -1178,7 +1184,7 @@ cifs_push_posix_locks(struct cifsFileInfo *cfile)
else
type = CIFS_WRLCK;
lck = list_entry(el, struct lock_to_push, llist);
- lck->pid = flock->fl_pid;
+ lck->pid = hash_lockowner(flock->fl_owner);
lck->netfid = cfile->fid.netfid;
lck->length = length;
lck->type = type;
@@ -1305,7 +1311,8 @@ cifs_getlk(struct file *file, struct file_lock *flock, __u32 type,
posix_lock_type = CIFS_RDLCK;
else
posix_lock_type = CIFS_WRLCK;
- rc = CIFSSMBPosixLock(xid, tcon, netfid, current->tgid,
+ rc = CIFSSMBPosixLock(xid, tcon, netfid,
+ hash_lockowner(flock->fl_owner),
flock->fl_start, length, flock,
posix_lock_type, wait_flag);
return rc;
@@ -1505,7 +1512,8 @@ cifs_setlk(struct file *file, struct file_lock *flock, __u32 type,
posix_lock_type = CIFS_UNLCK;
rc = CIFSSMBPosixLock(xid, tcon, cfile->fid.netfid,
- current->tgid, flock->fl_start, length,
+ hash_lockowner(flock->fl_owner),
+ flock->fl_start, length,
NULL, posix_lock_type, wait_flag);
goto out;
}