4.19-stable review patch. If anyone has any objections, please let me know.
------------------
From: Chad Austin chadaustin@fb.com
commit 2e64ff154ce6ce9a8dc0f9556463916efa6ff460 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: 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 Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- fs/fuse/dir.c | 2 +- fs/fuse/file.c | 21 +++++++++++---------- fs/fuse/fuse_i.h | 2 +- 3 files changed, 13 insertions(+), 12 deletions(-)
--- a/fs/fuse/dir.c +++ b/fs/fuse/dir.c @@ -1439,7 +1439,7 @@ static int fuse_dir_open(struct inode *i
static int fuse_dir_release(struct inode *inode, struct file *file) { - fuse_release_common(file, FUSE_RELEASEDIR); + fuse_release_common(file, true);
return 0; } --- a/fs/fuse/file.c +++ b/fs/fuse/file.c @@ -87,12 +87,12 @@ static void fuse_release_end(struct fuse 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' @@ -245,10 +245,11 @@ static void fuse_prepare_release(struct 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);
@@ -270,7 +271,7 @@ void fuse_release_common(struct file *fi * 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) @@ -286,7 +287,7 @@ static int fuse_release(struct inode *in 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; @@ -300,7 +301,7 @@ void fuse_sync_release(struct fuse_file * 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);
@@ -805,7 +806,7 @@ static void fuse_readpages_end(struct fu 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) @@ -1459,7 +1460,7 @@ static void fuse_writepage_free(struct f __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) @@ -1616,7 +1617,7 @@ int fuse_write_inode(struct inode *inode 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; } @@ -1930,7 +1931,7 @@ static int fuse_writepages(struct addres err = 0; } if (data.ff) - fuse_file_put(data.ff, false); + fuse_file_put(data.ff, false, false);
kfree(data.orig_pages); out: --- a/fs/fuse/fuse_i.h +++ b/fs/fuse/fuse_i.h @@ -749,7 +749,7 @@ void fuse_sync_release(struct fuse_file /** * 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