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authorSeth Forshee <seth.forshee@canonical.com>2016-03-11 10:35:34 -0600
committerMiklos Szeredi <miklos@szeredi.hu>2016-03-14 15:02:51 +0100
commit744742d692e37ad5c20630e57d526c8f2e2fe3c9 (patch)
treeef5965099fadc7d4c199a104e4715256afc53e9f /fs/fuse/file.c
parent7cabc61e01a0a8b663bd2b4c982aa53048218734 (diff)
fuse: Add reference counting for fuse_io_priv
The 'reqs' member of fuse_io_priv serves two purposes. First is to track the number of oustanding async requests to the server and to signal that the io request is completed. The second is to be a reference count on the structure to know when it can be freed. For sync io requests these purposes can be at odds. fuse_direct_IO() wants to block until the request is done, and since the signal is sent when 'reqs' reaches 0 it cannot keep a reference to the object. Yet it needs to use the object after the userspace server has completed processing requests. This leads to some handshaking and special casing that it needlessly complicated and responsible for at least one race condition. It's much cleaner and safer to maintain a separate reference count for the object lifecycle and to let 'reqs' just be a count of outstanding requests to the userspace server. Then we can know for sure when it is safe to free the object without any handshaking or special cases. The catch here is that most of the time these objects are stack allocated and should not be freed. Initializing these objects with a single reference that is never released prevents accidental attempts to free the objects. Fixes: 9d5722b7777e ("fuse: handle synchronous iocbs internally") Cc: stable@vger.kernel.org # v4.1+ Signed-off-by: Seth Forshee <seth.forshee@canonical.com> Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Diffstat (limited to 'fs/fuse/file.c')
-rw-r--r--fs/fuse/file.c28
1 files changed, 21 insertions, 7 deletions
diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 34a23df361ca..416108b42412 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -528,6 +528,11 @@ static void fuse_release_user_pages(struct fuse_req *req, int write)
}
}
+static void fuse_io_release(struct kref *kref)
+{
+ kfree(container_of(kref, struct fuse_io_priv, refcnt));
+}
+
static ssize_t fuse_get_res_by_io(struct fuse_io_priv *io)
{
if (io->err)
@@ -585,8 +590,9 @@ static void fuse_aio_complete(struct fuse_io_priv *io, int err, ssize_t pos)
}
io->iocb->ki_complete(io->iocb, res, 0);
- kfree(io);
}
+
+ kref_put(&io->refcnt, fuse_io_release);
}
static void fuse_aio_complete_req(struct fuse_conn *fc, struct fuse_req *req)
@@ -613,6 +619,7 @@ static size_t fuse_async_req_send(struct fuse_conn *fc, struct fuse_req *req,
size_t num_bytes, struct fuse_io_priv *io)
{
spin_lock(&io->lock);
+ kref_get(&io->refcnt);
io->size += num_bytes;
io->reqs++;
spin_unlock(&io->lock);
@@ -691,7 +698,7 @@ static void fuse_short_read(struct fuse_req *req, struct inode *inode,
static int fuse_do_readpage(struct file *file, struct page *page)
{
- struct fuse_io_priv io = { .async = 0, .file = file };
+ struct fuse_io_priv io = FUSE_IO_PRIV_SYNC(file);
struct inode *inode = page->mapping->host;
struct fuse_conn *fc = get_fuse_conn(inode);
struct fuse_req *req;
@@ -984,7 +991,7 @@ static size_t fuse_send_write_pages(struct fuse_req *req, struct file *file,
size_t res;
unsigned offset;
unsigned i;
- struct fuse_io_priv io = { .async = 0, .file = file };
+ struct fuse_io_priv io = FUSE_IO_PRIV_SYNC(file);
for (i = 0; i < req->num_pages; i++)
fuse_wait_on_page_writeback(inode, req->pages[i]->index);
@@ -1398,7 +1405,7 @@ static ssize_t __fuse_direct_read(struct fuse_io_priv *io,
static ssize_t fuse_direct_read_iter(struct kiocb *iocb, struct iov_iter *to)
{
- struct fuse_io_priv io = { .async = 0, .file = iocb->ki_filp };
+ struct fuse_io_priv io = FUSE_IO_PRIV_SYNC(iocb->ki_filp);
return __fuse_direct_read(&io, to, &iocb->ki_pos);
}
@@ -1406,7 +1413,7 @@ static ssize_t fuse_direct_write_iter(struct kiocb *iocb, struct iov_iter *from)
{
struct file *file = iocb->ki_filp;
struct inode *inode = file_inode(file);
- struct fuse_io_priv io = { .async = 0, .file = file };
+ struct fuse_io_priv io = FUSE_IO_PRIV_SYNC(file);
ssize_t res;
if (is_bad_inode(inode))
@@ -2864,6 +2871,7 @@ fuse_direct_IO(struct kiocb *iocb, struct iov_iter *iter, loff_t offset)
if (!io)
return -ENOMEM;
spin_lock_init(&io->lock);
+ kref_init(&io->refcnt);
io->reqs = 1;
io->bytes = -1;
io->size = 0;
@@ -2887,8 +2895,14 @@ fuse_direct_IO(struct kiocb *iocb, struct iov_iter *iter, loff_t offset)
iov_iter_rw(iter) == WRITE)
io->async = false;
- if (io->async && is_sync)
+ if (io->async && is_sync) {
+ /*
+ * Additional reference to keep io around after
+ * calling fuse_aio_complete()
+ */
+ kref_get(&io->refcnt);
io->done = &wait;
+ }
if (iov_iter_rw(iter) == WRITE) {
ret = fuse_direct_io(io, iter, &pos, FUSE_DIO_WRITE);
@@ -2908,7 +2922,7 @@ fuse_direct_IO(struct kiocb *iocb, struct iov_iter *iter, loff_t offset)
ret = fuse_get_res_by_io(io);
}
- kfree(io);
+ kref_put(&io->refcnt, fuse_io_release);
if (iov_iter_rw(iter) == WRITE) {
if (ret > 0)