bcachefs: Initial commit

Initially forked from drivers/md/bcache, bcachefs is a new copy-on-write
filesystem with every feature you could possibly want.

Website: https://bcachefs.org

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

1 files changed, 159 insertions, 0 deletions

diff --git a/fs/bcachefs/error.c b/fs/bcachefs/error.c
new file mode 100644
index 000000000000..e975fab43d49
--- /dev/null
+++ b/fs/bcachefs/error.c
@@ -0,0 +1,159 @@
+// SPDX-License-Identifier: GPL-2.0
+#include "bcachefs.h"
+#include "error.h"
+#include "io.h"
+#include "super.h"
+
+bool bch2_inconsistent_error(struct bch_fs *c)
+{
+	set_bit(BCH_FS_ERROR, &c->flags);
+
+	switch (c->opts.errors) {
+	case BCH_ON_ERROR_CONTINUE:
+		return false;
+	case BCH_ON_ERROR_RO:
+		if (bch2_fs_emergency_read_only(c))
+			bch_err(c, "emergency read only");
+		return true;
+	case BCH_ON_ERROR_PANIC:
+		panic(bch2_fmt(c, "panic after error"));
+		return true;
+	default:
+		BUG();
+	}
+}
+
+void bch2_fatal_error(struct bch_fs *c)
+{
+	if (bch2_fs_emergency_read_only(c))
+		bch_err(c, "emergency read only");
+}
+
+void bch2_io_error_work(struct work_struct *work)
+{
+	struct bch_dev *ca = container_of(work, struct bch_dev, io_error_work);
+	struct bch_fs *c = ca->fs;
+	bool dev;
+
+	mutex_lock(&c->state_lock);
+	dev = bch2_dev_state_allowed(c, ca, BCH_MEMBER_STATE_RO,
+				    BCH_FORCE_IF_DEGRADED);
+	if (dev
+	    ? __bch2_dev_set_state(c, ca, BCH_MEMBER_STATE_RO,
+				  BCH_FORCE_IF_DEGRADED)
+	    : bch2_fs_emergency_read_only(c))
+		bch_err(ca,
+			"too many IO errors, setting %s RO",
+			dev ? "device" : "filesystem");
+	mutex_unlock(&c->state_lock);
+}
+
+void bch2_io_error(struct bch_dev *ca)
+{
+	//queue_work(system_long_wq, &ca->io_error_work);
+}
+
+#ifdef __KERNEL__
+#define ask_yn()	false
+#else
+#include "tools-util.h"
+#endif
+
+enum fsck_err_ret bch2_fsck_err(struct bch_fs *c, unsigned flags,
+				const char *fmt, ...)
+{
+	struct fsck_err_state *s;
+	va_list args;
+	bool fix = false, print = true, suppressing = false;
+	char _buf[sizeof(s->buf)], *buf = _buf;
+
+	mutex_lock(&c->fsck_error_lock);
+
+	if (test_bit(BCH_FS_FSCK_DONE, &c->flags))
+		goto print;
+
+	list_for_each_entry(s, &c->fsck_errors, list)
+		if (s->fmt == fmt)
+			goto found;
+
+	s = kzalloc(sizeof(*s), GFP_KERNEL);
+	if (!s) {
+		if (!c->fsck_alloc_err)
+			bch_err(c, "kmalloc err, cannot ratelimit fsck errs");
+		c->fsck_alloc_err = true;
+		buf = _buf;
+		goto print;
+	}
+
+	INIT_LIST_HEAD(&s->list);
+	s->fmt = fmt;
+found:
+	list_move(&s->list, &c->fsck_errors);
+	s->nr++;
+	suppressing	= s->nr == 10;
+	print		= s->nr <= 10;
+	buf		= s->buf;
+print:
+	va_start(args, fmt);
+	vscnprintf(buf, sizeof(_buf), fmt, args);
+	va_end(args);
+
+	if (c->opts.fix_errors == FSCK_OPT_EXIT) {
+		bch_err(c, "%s, exiting", buf);
+		mutex_unlock(&c->fsck_error_lock);
+		return FSCK_ERR_EXIT;
+	}
+
+	if (flags & FSCK_CAN_FIX) {
+		if (c->opts.fix_errors == FSCK_OPT_ASK) {
+			printk(KERN_ERR "%s: fix?", buf);
+			fix = ask_yn();
+		} else if (c->opts.fix_errors == FSCK_OPT_YES ||
+			   (c->opts.nochanges &&
+			    !(flags & FSCK_CAN_IGNORE))) {
+			if (print)
+				bch_err(c, "%s, fixing", buf);
+			fix = true;
+		} else {
+			if (print)
+				bch_err(c, "%s, not fixing", buf);
+			fix = false;
+		}
+	} else if (flags & FSCK_NEED_FSCK) {
+		if (print)
+			bch_err(c, "%s (run fsck to correct)", buf);
+	} else {
+		if (print)
+			bch_err(c, "%s (repair unimplemented)", buf);
+	}
+
+	if (suppressing)
+		bch_err(c, "Ratelimiting new instances of previous error");
+
+	mutex_unlock(&c->fsck_error_lock);
+
+	if (fix)
+		set_bit(BCH_FS_FSCK_FIXED_ERRORS, &c->flags);
+
+	return fix				? FSCK_ERR_FIX
+		: flags & FSCK_CAN_IGNORE	? FSCK_ERR_IGNORE
+						: FSCK_ERR_EXIT;
+}
+
+void bch2_flush_fsck_errs(struct bch_fs *c)
+{
+	struct fsck_err_state *s, *n;
+
+	mutex_lock(&c->fsck_error_lock);
+	set_bit(BCH_FS_FSCK_DONE, &c->flags);
+
+	list_for_each_entry_safe(s, n, &c->fsck_errors, list) {
+		if (s->nr > 10)
+			bch_err(c, "Saw %llu errors like:\n    %s", s->nr, s->buf);
+
+		list_del(&s->list);
+		kfree(s);
+	}
+
+	mutex_unlock(&c->fsck_error_lock);
+}