bcachefs: BCH_IOCTL_FSCKbcachefs-ioctl-fsck

This adds a new ioctl for running fsck on a list of devices.

Normally, if we wish to use the kernel's implementation of fsck we'd run
it at mount time with -o fsck. This ioctl lets us run fsck without
mounting, so that userspace bcachefs-tools can transparently switch to
the kernel's implementation of fsck when appropriate - primarily if the
kernel version of bcachefs better matches the filesystem on disk.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

1 files changed, 19 insertions, 0 deletions

diff --git a/fs/bcachefs/super.c b/fs/bcachefs/super.c
index 9f1047a7666a..937a5f45a1ac 100644
--- a/fs/bcachefs/super.c
+++ b/fs/bcachefs/super.c
@@ -64,6 +64,23 @@
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Kent Overstreet <kent.overstreet@gmail.com>");
 
+void __bch2_print(struct bch_fs *c, const char *fmt, ...)
+{
+	va_list args;
+
+	va_start(args, fmt);
+	if (likely(!c->output)) {
+		vprintk(fmt, args);
+	} else {
+		unsigned long flags;
+
+		spin_lock_irqsave(&c->output->lock, flags);
+		prt_vprintf(&c->output->buf, fmt, args);
+		spin_unlock_irqrestore(&c->output->lock, flags);
+	}
+	va_end(args);
+}
+
 #define KTYPE(type)							\
 static const struct attribute_group type ## _group = {			\
 	.attrs = type ## _files						\
@@ -667,6 +684,8 @@ static struct bch_fs *bch2_fs_alloc(struct bch_sb *sb, struct bch_opts opts)
 		goto out;
 	}
 
+	c->output = (void *)(unsigned long) opts.log_output;
+
 	__module_get(THIS_MODULE);
 
 	closure_init(&c->cl, NULL);