diff options
Diffstat (limited to 'fs/fuse/virtio_fs.c')
| -rw-r--r-- | fs/fuse/virtio_fs.c | 37 |
1 files changed, 27 insertions, 10 deletions
diff --git a/fs/fuse/virtio_fs.c b/fs/fuse/virtio_fs.c index 8868ac31a3c0..bcb8a02e2d8b 100644 --- a/fs/fuse/virtio_fs.c +++ b/fs/fuse/virtio_fs.c @@ -18,6 +18,12 @@ #include <linux/uio.h> #include "fuse_i.h" +/* Used to help calculate the FUSE connection's max_pages limit for a request's + * size. Parts of the struct fuse_req are sliced into scattergather lists in + * addition to the pages used, so this can help account for that overhead. + */ +#define FUSE_HEADER_OVERHEAD 4 + /* List of virtio-fs device instances and a lock for the list. Also provides * mutual exclusion in device removal and mounting path */ @@ -127,11 +133,6 @@ static inline struct virtio_fs_vq *vq_to_fsvq(struct virtqueue *vq) return &fs->vqs[vq->index]; } -static inline struct fuse_pqueue *vq_to_fpq(struct virtqueue *vq) -{ - return &vq_to_fsvq(vq)->fud->pq; -} - /* Should be called with fsvq->lock held. */ static inline void inc_in_flight_req(struct virtio_fs_vq *fsvq) { @@ -896,6 +897,7 @@ static int virtio_fs_probe(struct virtio_device *vdev) out_vqs: vdev->config->reset(vdev); virtio_fs_cleanup_vqs(vdev, fs); + kfree(fs->vqs); out: vdev->priv = NULL; @@ -1324,8 +1326,15 @@ static int virtio_fs_fill_super(struct super_block *sb, struct fs_context *fsc) /* virtiofs allocates and installs its own fuse devices */ ctx->fudptr = NULL; - if (ctx->dax) + if (ctx->dax) { + if (!fs->dax_dev) { + err = -EINVAL; + pr_err("virtio-fs: dax can't be enabled as filesystem" + " device does not support it.\n"); + goto err_free_fuse_devs; + } ctx->dax_dev = fs->dax_dev; + } err = fuse_fill_super_common(sb, ctx); if (err < 0) goto err_free_fuse_devs; @@ -1406,9 +1415,10 @@ static int virtio_fs_get_tree(struct fs_context *fsc) { struct virtio_fs *fs; struct super_block *sb; - struct fuse_conn *fc; + struct fuse_conn *fc = NULL; struct fuse_mount *fm; - int err; + unsigned int virtqueue_size; + int err = -EIO; /* This gets a reference on virtio_fs object. This ptr gets installed * in fc->iq->priv. Once fuse_conn is going away, it calls ->put() @@ -1420,6 +1430,10 @@ static int virtio_fs_get_tree(struct fs_context *fsc) return -EINVAL; } + virtqueue_size = virtqueue_get_vring_size(fs->vqs[VQ_REQUEST].vq); + if (WARN_ON(virtqueue_size <= FUSE_HEADER_OVERHEAD)) + goto out_err; + err = -ENOMEM; fc = kzalloc(sizeof(struct fuse_conn), GFP_KERNEL); if (!fc) @@ -1429,12 +1443,15 @@ static int virtio_fs_get_tree(struct fs_context *fsc) if (!fm) goto out_err; - fuse_conn_init(fc, fm, get_user_ns(current_user_ns()), - &virtio_fs_fiq_ops, fs); + fuse_conn_init(fc, fm, fsc->user_ns, &virtio_fs_fiq_ops, fs); fc->release = fuse_free_conn; fc->delete_stale = true; fc->auto_submounts = true; + /* Tell FUSE to split requests that exceed the virtqueue's size */ + fc->max_pages_limit = min_t(unsigned int, fc->max_pages_limit, + virtqueue_size - FUSE_HEADER_OVERHEAD); + fsc->s_fs_info = fm; sb = sget_fc(fsc, virtio_fs_test_super, set_anon_super_fc); if (fsc->s_fs_info) { |