Update Linux to v5.4.2
Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/fs/fuse/control.c b/fs/fuse/control.c
index 0b69465..c23f6f2 100644
--- a/fs/fuse/control.c
+++ b/fs/fuse/control.c
@@ -10,6 +10,7 @@
#include <linux/init.h>
#include <linux/module.h>
+#include <linux/fs_context.h>
#define FUSE_CTL_SUPER_MAGIC 0x65735543
@@ -35,7 +36,9 @@
{
struct fuse_conn *fc = fuse_ctl_file_conn_get(file);
if (fc) {
- fuse_abort_conn(fc, true);
+ if (fc->abort_err)
+ fc->aborted = true;
+ fuse_abort_conn(fc);
fuse_conn_put(fc);
}
return count;
@@ -107,7 +110,7 @@
if (!fc)
return 0;
- val = fc->max_background;
+ val = READ_ONCE(fc->max_background);
fuse_conn_put(fc);
return fuse_conn_limit_read(file, buf, len, ppos, val);
@@ -125,7 +128,12 @@
if (ret > 0) {
struct fuse_conn *fc = fuse_ctl_file_conn_get(file);
if (fc) {
+ spin_lock(&fc->bg_lock);
fc->max_background = val;
+ fc->blocked = fc->num_background >= fc->max_background;
+ if (!fc->blocked)
+ wake_up(&fc->blocked_waitq);
+ spin_unlock(&fc->bg_lock);
fuse_conn_put(fc);
}
}
@@ -144,7 +152,7 @@
if (!fc)
return 0;
- val = fc->congestion_threshold;
+ val = READ_ONCE(fc->congestion_threshold);
fuse_conn_put(fc);
return fuse_conn_limit_read(file, buf, len, ppos, val);
@@ -155,18 +163,31 @@
size_t count, loff_t *ppos)
{
unsigned uninitialized_var(val);
+ struct fuse_conn *fc;
ssize_t ret;
ret = fuse_conn_limit_write(file, buf, count, ppos, &val,
max_user_congthresh);
- if (ret > 0) {
- struct fuse_conn *fc = fuse_ctl_file_conn_get(file);
- if (fc) {
- fc->congestion_threshold = val;
- fuse_conn_put(fc);
+ if (ret <= 0)
+ goto out;
+ fc = fuse_ctl_file_conn_get(file);
+ if (!fc)
+ goto out;
+
+ spin_lock(&fc->bg_lock);
+ fc->congestion_threshold = val;
+ if (fc->sb) {
+ if (fc->num_background < fc->congestion_threshold) {
+ clear_bdi_congested(fc->sb->s_bdi, BLK_RW_SYNC);
+ clear_bdi_congested(fc->sb->s_bdi, BLK_RW_ASYNC);
+ } else {
+ set_bdi_congested(fc->sb->s_bdi, BLK_RW_SYNC);
+ set_bdi_congested(fc->sb->s_bdi, BLK_RW_ASYNC);
}
}
-
+ spin_unlock(&fc->bg_lock);
+ fuse_conn_put(fc);
+out:
return ret;
}
@@ -297,7 +318,7 @@
drop_nlink(d_inode(fuse_control_sb->s_root));
}
-static int fuse_ctl_fill_super(struct super_block *sb, void *data, int silent)
+static int fuse_ctl_fill_super(struct super_block *sb, struct fs_context *fctx)
{
static const struct tree_descr empty_descr = {""};
struct fuse_conn *fc;
@@ -323,10 +344,19 @@
return 0;
}
-static struct dentry *fuse_ctl_mount(struct file_system_type *fs_type,
- int flags, const char *dev_name, void *raw_data)
+static int fuse_ctl_get_tree(struct fs_context *fc)
{
- return mount_single(fs_type, flags, raw_data, fuse_ctl_fill_super);
+ return get_tree_single(fc, fuse_ctl_fill_super);
+}
+
+static const struct fs_context_operations fuse_ctl_context_ops = {
+ .get_tree = fuse_ctl_get_tree,
+};
+
+static int fuse_ctl_init_fs_context(struct fs_context *fc)
+{
+ fc->ops = &fuse_ctl_context_ops;
+ return 0;
}
static void fuse_ctl_kill_sb(struct super_block *sb)
@@ -345,7 +375,7 @@
static struct file_system_type fuse_ctl_fs_type = {
.owner = THIS_MODULE,
.name = "fusectl",
- .mount = fuse_ctl_mount,
+ .init_fs_context = fuse_ctl_init_fs_context,
.kill_sb = fuse_ctl_kill_sb,
};
MODULE_ALIAS_FS("fusectl");