fuse: continue to send FUSE_RELEASEDIR when FUSE_OPEN returns ENOSYS

BugLink: https://bugs.launchpad.net/bugs/1824553
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'")
Cc: <stable@vger.kernel.org> # v3.14
Signed-off-by: Chad Austin <chadaustin@fb.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
(cherry picked from commit 2e64ff154ce6ce9a8dc0f9556463916efa6ff460)
Signed-off-by: Andrea Righi <andrea.righi@canonical.com>
Acked-by: Stefan Bader <stefan.bader@canonical.com>
Acked-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>

diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c
index 69524ba8551bac7d72e88481c4c50e40aa14ea35..b5880cc175007a06eedf9d15bb9ad09e463d1c1a 100644 (file)
--- a/fs/fuse/dir.c
+++ b/fs/fuse/dir.c
@@ -1424,7 +1424,7 @@ 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, true);
 
        return 0;
 }

diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 5278c522543bb66bd7c089cd482440ce8df4479f..cfcc313c28e30f63e2d04c3aed6605751b665d38 100644 (file)
--- 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'
@@ -244,10 +244,11 @@ 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, bool isdir)
 {
        struct fuse_file *ff = file->private_data;
        struct fuse_req *req = ff->reserved_req;
+       int opcode = isdir ? FUSE_RELEASEDIR : FUSE_RELEASE;
 
        fuse_prepare_release(ff, file->f_flags, opcode);
 
@@ -269,7 +270,7 @@ 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 +286,7 @@ 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, false);
 
        /* return value is ignored by VFS */
        return 0;
@@ -299,7 +300,7 @@ 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 +805,7 @@ 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 +1458,7 @@ 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 +1615,7 @@ 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, false, false);
 
        return err;
 }
@@ -1928,7 +1929,7 @@ 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 a6a33272c15328f257fa563a94fbdcfb2a3775ff..b410ba5b49f50fe21636e5171ec0ab91061e1748 100644 (file)
--- a/fs/fuse/fuse_i.h
+++ b/fs/fuse/fuse_i.h
@@ -743,7 +743,7 @@ 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, bool isdir);
 
 /**
  * Send FSYNC or FSYNCDIR request