diff options
Diffstat (limited to 'fs/kernfs/file.c')
| -rw-r--r-- | fs/kernfs/file.c | 22 |
1 files changed, 16 insertions, 6 deletions
diff --git a/fs/kernfs/file.c b/fs/kernfs/file.c index 21e719199a84..7fb45ee36897 100644 --- a/fs/kernfs/file.c +++ b/fs/kernfs/file.c @@ -740,10 +740,15 @@ err_out: static void kernfs_release_file(struct kernfs_node *kn, struct kernfs_open_file *of) { - if (!(kn->flags & KERNFS_HAS_RELEASE)) - return; + /* + * @of is guaranteed to have no other file operations in flight and + * we just want to synchronize release and drain paths. + * @kernfs_open_file_mutex is enough. @of->mutex can't be used + * here because drain path may be called from places which can + * cause circular dependency. + */ + lockdep_assert_held(&kernfs_open_file_mutex); - mutex_lock(&of->mutex); if (!of->released) { /* * A file is never detached without being released and we @@ -753,7 +758,6 @@ static void kernfs_release_file(struct kernfs_node *kn, kn->attr.ops->release(of); of->released = true; } - mutex_unlock(&of->mutex); } static int kernfs_fop_release(struct inode *inode, struct file *filp) @@ -761,7 +765,12 @@ static int kernfs_fop_release(struct inode *inode, struct file *filp) struct kernfs_node *kn = filp->f_path.dentry->d_fsdata; struct kernfs_open_file *of = kernfs_of(filp); - kernfs_release_file(kn, of); + if (kn->flags & KERNFS_HAS_RELEASE) { + mutex_lock(&kernfs_open_file_mutex); + kernfs_release_file(kn, of); + mutex_unlock(&kernfs_open_file_mutex); + } + kernfs_put_open_node(kn, of); seq_release(inode, filp); kfree(of->prealloc_buf); @@ -794,7 +803,8 @@ void kernfs_drain_open_files(struct kernfs_node *kn) if (kn->flags & KERNFS_HAS_MMAP) unmap_mapping_range(inode->i_mapping, 0, 0, 1); - kernfs_release_file(kn, of); + if (kn->flags & KERNFS_HAS_RELEASE) + kernfs_release_file(kn, of); } mutex_unlock(&kernfs_open_file_mutex); |