[PATCH v2 13/17] locks: remove i_have_this_lease check from __break_lease
DORMANTno replies
From: Jeff Layton <hidden>
Date: 2014-09-04 12:38:39
Also in:
linux-fsdevel, lkml
Subsystem:
file locking (flock() and fcntl()/lockf()), filesystems (vfs and infrastructure), the rest · Maintainers:
Jeff Layton, Chuck Lever, Alexander Viro, Christian Brauner, Linus Torvalds
Possibly related (same subject, not in this thread)
- 2014-09-04 · Re: [PATCH v2 13/17] locks: remove i_have_this_lease check from __break_lease · Jeff Layton <hidden>
- 2014-09-04 · Re: [PATCH v2 13/17] locks: remove i_have_this_lease check from __break_lease · Christoph Hellwig <hidden>
I think that the intent of this code was to ensure that a process won't deadlock if it has one fd open with a lease on it and then breaks that lease by opening another fd. In that case it'll treat the __break_lease call as if it were non-blocking. This seems wrong -- the process could (for instance) be multithreaded and managing different fds via different threads. I also don't see any mention of this limitation in the (somewhat sketchy) documentation. Remove the check and the non-blocking behavior when i_have_this_lease is true. Signed-off-by: Jeff Layton <redacted> --- fs/locks.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-)
diff --git a/fs/locks.c b/fs/locks.c
index dc2e9e18f32d..011812490c92 100644
--- a/fs/locks.c
+++ b/fs/locks.c@@ -1370,7 +1370,6 @@ int __break_lease(struct inode *inode, unsigned int mode, unsigned int type) struct file_lock *new_fl, *flock; struct file_lock *fl; unsigned long break_time; - int i_have_this_lease = 0; bool lease_conflict = false; int want_write = (mode & O_ACCMODE) != O_RDONLY; LIST_HEAD(dispose);
@@ -1391,8 +1390,7 @@ int __break_lease(struct inode *inode, unsigned int mode, unsigned int type) for (fl = flock; fl && IS_LEASE(fl); fl = fl->fl_next) { if (leases_conflict(fl, new_fl)) { lease_conflict = true; - if (fl->fl_owner == current->files) - i_have_this_lease = 1; + break; } } if (!lease_conflict)
@@ -1422,7 +1420,7 @@ int __break_lease(struct inode *inode, unsigned int mode, unsigned int type) fl->fl_lmops->lm_break(fl); } - if (i_have_this_lease || (mode & O_NONBLOCK)) { + if (mode & O_NONBLOCK) { trace_break_lease_noblock(inode, new_fl); error = -EWOULDBLOCK; goto out;
--
1.9.3