On Mon, Dec 10, 2018 at 8:05 PM Chad Austin <chadaustin@xxxxxx> wrote:
>
> When FUSE_OPEN returns ENOSYS, the no_open bit is set on the
> connection. Because the FUSE_RELEASE and FUSE_RELEASEDIR paths share
> code, this incorrectly caused the FUSE_RELEASEDIR request to be
> dropped and never sent to userspace. Pass an isdir bool to distinguish
> between FUSE_RELEASE and FUSE_RELEASEDIR inside of fuse_file_put.
>
> Fixes: 7678ac50615d ("fuse: support clients that don't implement 'open'")
Thanks.
You did not add a Signed-off-by. Can I add it for you?
> ---
> fs/fuse/dir.c | 2 +-
> fs/fuse/file.c | 20 ++++++++++----------
> fs/fuse/fuse_i.h | 2 +-
> 3 files changed, 12 insertions(+), 12 deletions(-)
>
> diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c
> index f79aaca30efa..45322408e029 100644
> --- a/fs/fuse/dir.c
> +++ b/fs/fuse/dir.c
> @@ -1462,7 +1462,7 @@ static int fuse_dir_open(struct inode *inode, struct file *file)
>
> static int fuse_dir_release(struct inode *inode, struct file *file)
> {
> - fuse_release_common(file, FUSE_RELEASEDIR);
> + fuse_release_common(file, FUSE_RELEASEDIR, true);
>
> return 0;
> }
> diff --git a/fs/fuse/file.c b/fs/fuse/file.c
> index a201fb0ac64f..defd635adf01 100644
> --- a/fs/fuse/file.c
> +++ b/fs/fuse/file.c
> @@ -86,12 +86,12 @@ static void fuse_release_end(struct fuse_conn *fc, struct fuse_req *req)
> iput(req->misc.release.inode);
> }
>
> -static void fuse_file_put(struct fuse_file *ff, bool sync)
> +static void fuse_file_put(struct fuse_file *ff, bool sync, bool isdir)
> {
> if (refcount_dec_and_test(&ff->count)) {
> struct fuse_req *req = ff->reserved_req;
>
> - if (ff->fc->no_open) {
> + if (ff->fc->no_open && !isdir) {
> /*
> * Drop the release request when client does not
> * implement 'open'
> @@ -244,7 +244,7 @@ static void fuse_prepare_release(struct fuse_file *ff, int flags, int opcode)
> req->in.args[0].value = inarg;
> }
>
> -void fuse_release_common(struct file *file, int opcode)
> +void fuse_release_common(struct file *file, int opcode, bool isdir)
opcode and isdir are redundant. I've fixed it up (kept isdir) to
match fuse_open_common() signature.
Otherwise looks good.
> {
> struct fuse_file *ff = file->private_data;
> struct fuse_req *req = ff->reserved_req;
> @@ -269,7 +269,7 @@ void fuse_release_common(struct file *file, int opcode)
> * synchronous RELEASE is allowed (and desirable) in this case
> * because the server can be trusted not to screw up.
> */
> - fuse_file_put(ff, ff->fc->destroy_req != NULL);
> + fuse_file_put(ff, ff->fc->destroy_req != NULL, isdir);
> }
>
> static int fuse_open(struct inode *inode, struct file *file)
> @@ -285,7 +285,7 @@ static int fuse_release(struct inode *inode, struct file *file)
> if (fc->writeback_cache)
> write_inode_now(inode, 1);
>
> - fuse_release_common(file, FUSE_RELEASE);
> + fuse_release_common(file, FUSE_RELEASE, false);
>
> /* return value is ignored by VFS */
> return 0;
> @@ -299,7 +299,7 @@ void fuse_sync_release(struct fuse_file *ff, int flags)
> * iput(NULL) is a no-op and since the refcount is 1 and everything's
> * synchronous, we are fine with not doing igrab() here"
> */
> - fuse_file_put(ff, true);
> + fuse_file_put(ff, true, false);
> }
> EXPORT_SYMBOL_GPL(fuse_sync_release);
>
> @@ -804,7 +804,7 @@ static void fuse_readpages_end(struct fuse_conn *fc, struct fuse_req *req)
> put_page(page);
> }
> if (req->ff)
> - fuse_file_put(req->ff, false);
> + fuse_file_put(req->ff, false, false);
> }
>
> static void fuse_send_readpages(struct fuse_req *req, struct file *file)
> @@ -1457,7 +1457,7 @@ static void fuse_writepage_free(struct fuse_conn *fc, struct fuse_req *req)
> __free_page(req->pages[i]);
>
> if (req->ff)
> - fuse_file_put(req->ff, false);
> + fuse_file_put(req->ff, false, false);
> }
>
> static void fuse_writepage_finish(struct fuse_conn *fc, struct fuse_req *req)
> @@ -1614,7 +1614,7 @@ int fuse_write_inode(struct inode *inode, struct writeback_control *wbc)
> ff = __fuse_write_file_get(fc, fi);
> err = fuse_flush_times(inode, ff);
> if (ff)
> - fuse_file_put(ff, 0);
> + fuse_file_put(ff, 0, false);
>
> return err;
> }
> @@ -1928,7 +1928,7 @@ static int fuse_writepages(struct address_space *mapping,
> err = 0;
> }
> if (data.ff)
> - fuse_file_put(data.ff, false);
> + fuse_file_put(data.ff, false, false);
>
> kfree(data.orig_pages);
> out:
> diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
> index b2c388b00888..668bb16dd553 100644
> --- a/fs/fuse/fuse_i.h
> +++ b/fs/fuse/fuse_i.h
> @@ -742,7 +742,7 @@ void fuse_sync_release(struct fuse_file *ff, int flags);
> /**
> * Send RELEASE or RELEASEDIR request
> */
> -void fuse_release_common(struct file *file, int opcode);
> +void fuse_release_common(struct file *file, int opcode, bool isdir);
>
> /**
> * Send FSYNC or FSYNCDIR request
> --
> 2.17.1
>
