diff options
| author | Miklos Szeredi <mszeredi@redhat.com> | 2019-10-23 14:26:37 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-11-06 12:18:15 +0100 |
| commit | 709c37e26c49faee2b3b45fe4eff459b99b9128e (patch) | |
| tree | f17a4ead0c05c370c3460ee8ac37d89a1eea9a88 /fs/fuse | |
| parent | c829f32c09dd396f5ed0be8aa33470c314c677d6 (diff) | |
fuse: truncate pending writes on O_TRUNC
commit e4648309b85a78f8c787457832269a8712a8673e upstream.
Make sure cached writes are not reordered around open(..., O_TRUNC), with
the obvious wrong results.
Fixes: 4d99ff8f12eb ("fuse: Turn writeback cache on")
Cc: <stable@vger.kernel.org> # v3.15+
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs/fuse')
| -rw-r--r-- | fs/fuse/file.c | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/fs/fuse/file.c b/fs/fuse/file.c index 1b0e7b1039c1..92f905ea20b0 100644 --- a/fs/fuse/file.c +++ b/fs/fuse/file.c @@ -201,7 +201,7 @@ int fuse_open_common(struct inode *inode, struct file *file, bool isdir) { struct fuse_conn *fc = get_fuse_conn(inode); int err; - bool lock_inode = (file->f_flags & O_TRUNC) && + bool is_wb_truncate = (file->f_flags & O_TRUNC) && fc->atomic_o_trunc && fc->writeback_cache; @@ -209,16 +209,20 @@ int fuse_open_common(struct inode *inode, struct file *file, bool isdir) if (err) return err; - if (lock_inode) + if (is_wb_truncate) { inode_lock(inode); + fuse_set_nowrite(inode); + } err = fuse_do_open(fc, get_node_id(inode), file, isdir); if (!err) fuse_finish_open(inode, file); - if (lock_inode) + if (is_wb_truncate) { + fuse_release_nowrite(inode); inode_unlock(inode); + } return err; } |