From 2f7c68cb55ecb7331f2381deb497c27155f32faf Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Wed, 03 Jan 2024 09:43:39 +0000
Subject: [PATCH] update kernel to 5.10.198
---
kernel/fs/fuse/virtio_fs.c | 46 ++++++++++++++++++++++++++++++----------------
1 files changed, 30 insertions(+), 16 deletions(-)
diff --git a/kernel/fs/fuse/virtio_fs.c b/kernel/fs/fuse/virtio_fs.c
index 90a574b..86b553c 100644
--- a/kernel/fs/fuse/virtio_fs.c
+++ b/kernel/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
*/
@@ -1395,7 +1401,7 @@
bool last;
/* If mount failed, we can still be called without any fc */
- if (fm) {
+ if (sb->s_root) {
last = fuse_mount_remove(fm);
if (last)
virtio_fs_conn_destroy(fm);
@@ -1428,9 +1434,10 @@
{
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()
@@ -1442,27 +1449,27 @@
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) {
- mutex_lock(&virtio_fs_mutex);
- virtio_fs_put(fs);
- mutex_unlock(&virtio_fs_mutex);
- return -ENOMEM;
- }
+ if (!fc)
+ goto out_err;
fm = kzalloc(sizeof(struct fuse_mount), GFP_KERNEL);
- if (!fm) {
- mutex_lock(&virtio_fs_mutex);
- virtio_fs_put(fs);
- mutex_unlock(&virtio_fs_mutex);
- kfree(fc);
- return -ENOMEM;
- }
+ if (!fm)
+ goto out_err;
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, virtio_fs_set_super);
@@ -1485,6 +1492,13 @@
WARN_ON(fsc->root);
fsc->root = dget(sb->s_root);
return 0;
+
+out_err:
+ kfree(fc);
+ mutex_lock(&virtio_fs_mutex);
+ virtio_fs_put(fs);
+ mutex_unlock(&virtio_fs_mutex);
+ return err;
}
static const struct fs_context_operations virtio_fs_context_ops = {
--
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