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locks: ensure that fl_owner is always initialized properly in flock and lease codepaths 

Currently, the fl_owner isn't set for flock locks. Some filesystems use
byte-range locks to simulate flock locks and there is a common idiom in
those that does:

    fl->fl_owner = (fl_owner_t)filp;
    fl->fl_start = 0;
    fl->fl_end = OFFSET_MAX;

Since flock locks are generally "owned" by the open file description,
move this into the common flock lock setup code. The fl_start and fl_end
fields are already set appropriately, so remove the unneeded setting of
that in flock ops in those filesystems as well.

Finally, the lease code also sets the fl_owner as if they were owned by
the process and not the open file description. This is incorrect as
leases have the same ownership semantics as flock locks. Set them the
same way. The lease code doesn't actually use the fl_owner value for
anything, so this is more for consistency's sake than a bugfix.

Reported-by: Trond Myklebust <trond.myklebust@primarydata.com>
Signed-off-by: Jeff Layton <jlayton@poochiereds.net>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> (Staging portion)
Acked-by: J. Bruce Fields <bfields@fieldses.org>
This commit is contained in:
Jeff Layton 2014-05-09 14:13:04 -04:00
parent cf01f4eef9
commit 130d1f956a
7 changed files with 11 additions and 32 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
drivers/staging/lustre/lustre/llite/file.c
View File

@ -2691,20 +2691,15 @@ int ll_file_flock(struct file *file, int cmd, struct file_lock *file_lock)
ll_stats_ops_tally(ll_i2sbi(inode), LPROC_LL_FLOCK, 1);
if (file_lock->fl_flags & FL_FLOCK) {
if (file_lock->fl_flags & FL_FLOCK)
LASSERT((cmd == F_SETLKW) || (cmd == F_SETLK));
/* flocks are whole-file locks */
flock.l_flock.end = OFFSET_MAX;
/* For flocks owner is determined by the local file descriptor*/
flock.l_flock.owner = (unsigned long)file_lock->fl_file;
} else if (file_lock->fl_flags & FL_POSIX) {
flock.l_flock.owner = (unsigned long)file_lock->fl_owner;
flock.l_flock.start = file_lock->fl_start;
flock.l_flock.end = file_lock->fl_end;
} else {
else if (!(file_lock->fl_flags & FL_POSIX))
return -EINVAL;
}
flock.l_flock.owner = (unsigned long)file_lock->fl_owner;
flock.l_flock.pid = file_lock->fl_pid;
flock.l_flock.start = file_lock->fl_start;
flock.l_flock.end = file_lock->fl_end;
/* Somewhat ugly workaround for svc lockd.
* lockd installs custom fl_lmops->lm_compare_owner that checks

3
fs/9p/vfs_file.c
View File

@ -352,9 +352,6 @@ static int v9fs_file_flock_dotl(struct file *filp, int cmd,
invalidate_mapping_pages(&inode->i_data, 0, -1);
}
/* Convert flock to posix lock */
fl->fl_owner = (fl_owner_t)filp;
fl->fl_start = 0;
fl->fl_end = OFFSET_MAX;
fl->fl_flags |= FL_POSIX;
fl->fl_flags ^= FL_FLOCK;

4
fs/afs/flock.c
View File

@ -555,10 +555,6 @@ int afs_flock(struct file *file, int cmd, struct file_lock *fl)
return -ENOLCK;
/* we're simulating flock() locks using posix locks on the server */
fl->fl_owner = (fl_owner_t) file;
fl->fl_start = 0;
fl->fl_end = OFFSET_MAX;
if (fl->fl_type == F_UNLCK)
return afs_do_unlk(file, fl);
return afs_do_setlk(file, fl);

10
fs/ceph/locks.c
View File

@ -53,10 +53,7 @@ static int ceph_lock_message(u8 lock_type, u16 operation, struct file *file,
else
length = fl->fl_end - fl->fl_start + 1;
if (lock_type == CEPH_LOCK_FCNTL)
owner = secure_addr(fl->fl_owner);
else
owner = secure_addr(fl->fl_file);
owner = secure_addr(fl->fl_owner);
dout("ceph_lock_message: rule: %d, op: %d, owner: %llx, pid: %llu, "
"start: %llu, length: %llu, wait: %d, type: %d", (int)lock_type,
@ -314,10 +311,7 @@ int lock_to_ceph_filelock(struct file_lock *lock,
cephlock->length = cpu_to_le64(lock->fl_end - lock->fl_start + 1);
cephlock->client = cpu_to_le64(0);
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));
cephlock->owner = cpu_to_le64(secure_addr(lock->fl_owner));
switch (lock->fl_type) {
case F_RDLCK:

1
fs/fuse/file.c
View File

@ -2304,7 +2304,6 @@ static int fuse_file_flock(struct file *file, int cmd, struct file_lock *fl)
struct fuse_file *ff = file->private_data;
/* emulate flock with POSIX locks */
fl->fl_owner = (fl_owner_t) file;
ff->flock = true;
err = fuse_setlk(file, fl, 1);
}

4
fs/locks.c
View File

@ -322,6 +322,7 @@ static int flock_make_lock(struct file *filp, struct file_lock **lock,
return -ENOMEM;
fl->fl_file = filp;
fl->fl_owner = (fl_owner_t)filp;
fl->fl_pid = current->tgid;
fl->fl_flags = FL_FLOCK;
fl->fl_type = type;
@ -427,7 +428,7 @@ static int lease_init(struct file *filp, long type, struct file_lock *fl)
if (assign_type(fl, type) != 0)
return -EINVAL;
fl->fl_owner = current->files;
fl->fl_owner = (fl_owner_t)filp;
fl->fl_pid = current->tgid;
fl->fl_file = filp;
@ -2316,6 +2317,7 @@ void locks_remove_file(struct file *filp)
if (filp->f_op->flock) {
struct file_lock fl = {
.fl_owner = (fl_owner_t)filp,
.fl_pid = current->tgid,
.fl_file = filp,
.fl_flags = FL_FLOCK,

4
fs/nfs/file.c
View File

@ -916,10 +916,6 @@ int nfs_flock(struct file *filp, int cmd, struct file_lock *fl)
is_local = 1;
/* We're simulating flock() locks using posix locks on the server */
fl->fl_owner = (fl_owner_t)filp;
fl->fl_start = 0;
fl->fl_end = OFFSET_MAX;
if (fl->fl_type == F_UNLCK)
return do_unlk(filp, cmd, fl, is_local);
return do_setlk(filp, cmd, fl, is_local);