udf: Release preallocation on last writeable close

Commit 6fb1ca92a640 "udf: Fix race between write(2) and close(2)"
changed the condition when preallocation is released. The idea was that
we don't want to release the preallocation for an inode on close when
there are other writeable file descriptors for the inode. However the
condition was written in the opposite way so we released preallocation
only if there were other writeable file descriptors. Fix the problem by
changing the condition properly.

CC: stable@vger.kernel.org
Fixes: 6fb1ca92a6409a9d5b0696447cd4997bc9aaf5a2
Reported-by: Fabian Frederick <fabf@skynet.be>
Signed-off-by: Jan Kara <jack@suse.cz>

diff --git a/fs/udf/file.c b/fs/udf/file.c
index bb15771b92ae32ae02390179492647a1d87c9dc2..08f3555fbeac3f6ceeda033cb8f6ec82557623d0 100644 (file)
--- a/fs/udf/file.c
+++ b/fs/udf/file.c
@@ -224,7 +224,7 @@ out:
 static int udf_release_file(struct inode *inode, struct file *filp)
 {
        if (filp->f_mode & FMODE_WRITE &&
-           atomic_read(&inode->i_writecount) > 1) {
+           atomic_read(&inode->i_writecount) == 1) {
                /*
                 * Grab i_mutex to avoid races with writes changing i_size
                 * while we are running.