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fuse: continue to send FUSE_RELEASEDIR when FUSE_OPEN returns ENOSYS 

commit 2e64ff154c upstream.

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: 7678ac5061 ("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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Chad Austin 2018-12-10 10:54:52 -08:00 committed by Greg Kroah-Hartman
parent 38ef9c5a93
commit c1149b8734
3 changed files with 13 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
fs/fuse/dir.c
View File

@ -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;
}

21
fs/fuse/file.c
View File

@ -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)
@ -1458,7 +1459,7 @@ 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)
@ -1615,7 +1616,7 @@ 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;
}
@ -1929,7 +1930,7 @@ 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:

2
fs/fuse/fuse_i.h
View File

@ -739,7 +739,7 @@ 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