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-rw-r--r--fs/bcachefs/error.c302
1 files changed, 302 insertions, 0 deletions
diff --git a/fs/bcachefs/error.c b/fs/bcachefs/error.c
new file mode 100644
index 0000000000..25cf78a7b9
--- /dev/null
+++ b/fs/bcachefs/error.c
@@ -0,0 +1,302 @@
+// SPDX-License-Identifier: GPL-2.0
+#include "bcachefs.h"
+#include "error.h"
+#include "super.h"
+
+#define FSCK_ERR_RATELIMIT_NR 10
+
+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, "inconsistency detected - emergency read only");
+ return true;
+ case BCH_ON_ERROR_panic:
+ panic(bch2_fmt(c, "panic after error"));
+ return true;
+ default:
+ BUG();
+ }
+}
+
+void bch2_topology_error(struct bch_fs *c)
+{
+ set_bit(BCH_FS_TOPOLOGY_ERROR, &c->flags);
+ if (test_bit(BCH_FS_FSCK_DONE, &c->flags))
+ bch2_inconsistent_error(c);
+}
+
+void bch2_fatal_error(struct bch_fs *c)
+{
+ if (bch2_fs_emergency_read_only(c))
+ bch_err(c, "fatal error - 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;
+
+ down_write(&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");
+ up_write(&c->state_lock);
+}
+
+void bch2_io_error(struct bch_dev *ca, enum bch_member_error_type type)
+{
+ atomic64_inc(&ca->errors[type]);
+ //queue_work(system_long_wq, &ca->io_error_work);
+}
+
+enum ask_yn {
+ YN_NO,
+ YN_YES,
+ YN_ALLNO,
+ YN_ALLYES,
+};
+
+#ifdef __KERNEL__
+#define bch2_fsck_ask_yn() YN_NO
+#else
+
+#include "tools-util.h"
+
+enum ask_yn bch2_fsck_ask_yn(void)
+{
+ char *buf = NULL;
+ size_t buflen = 0;
+ bool ret;
+
+ while (true) {
+ fputs(" (y,n, or Y,N for all errors of this type) ", stdout);
+ fflush(stdout);
+
+ if (getline(&buf, &buflen, stdin) < 0)
+ die("error reading from standard input");
+
+ strim(buf);
+ if (strlen(buf) != 1)
+ continue;
+
+ switch (buf[0]) {
+ case 'n':
+ return YN_NO;
+ case 'y':
+ return YN_YES;
+ case 'N':
+ return YN_ALLNO;
+ case 'Y':
+ return YN_ALLYES;
+ }
+ }
+
+ free(buf);
+ return ret;
+}
+
+#endif
+
+static struct fsck_err_state *fsck_err_get(struct bch_fs *c, const char *fmt)
+{
+ struct fsck_err_state *s;
+
+ if (test_bit(BCH_FS_FSCK_DONE, &c->flags))
+ return NULL;
+
+ list_for_each_entry(s, &c->fsck_error_msgs, list)
+ if (s->fmt == fmt) {
+ /*
+ * move it to the head of the list: repeated fsck errors
+ * are common
+ */
+ list_move(&s->list, &c->fsck_error_msgs);
+ return s;
+ }
+
+ s = kzalloc(sizeof(*s), GFP_NOFS);
+ if (!s) {
+ if (!c->fsck_alloc_msgs_err)
+ bch_err(c, "kmalloc err, cannot ratelimit fsck errs");
+ c->fsck_alloc_msgs_err = true;
+ return NULL;
+ }
+
+ INIT_LIST_HEAD(&s->list);
+ s->fmt = fmt;
+ list_add(&s->list, &c->fsck_error_msgs);
+ return s;
+}
+
+int bch2_fsck_err(struct bch_fs *c,
+ enum bch_fsck_flags flags,
+ enum bch_sb_error_id err,
+ const char *fmt, ...)
+{
+ struct fsck_err_state *s = NULL;
+ va_list args;
+ bool print = true, suppressing = false, inconsistent = false;
+ struct printbuf buf = PRINTBUF, *out = &buf;
+ int ret = -BCH_ERR_fsck_ignore;
+
+ if (test_bit(err, c->sb.errors_silent))
+ return -BCH_ERR_fsck_fix;
+
+ bch2_sb_error_count(c, err);
+
+ va_start(args, fmt);
+ prt_vprintf(out, fmt, args);
+ va_end(args);
+
+ mutex_lock(&c->fsck_error_msgs_lock);
+ s = fsck_err_get(c, fmt);
+ if (s) {
+ /*
+ * We may be called multiple times for the same error on
+ * transaction restart - this memoizes instead of asking the user
+ * multiple times for the same error:
+ */
+ if (s->last_msg && !strcmp(buf.buf, s->last_msg)) {
+ ret = s->ret;
+ mutex_unlock(&c->fsck_error_msgs_lock);
+ printbuf_exit(&buf);
+ return ret;
+ }
+
+ kfree(s->last_msg);
+ s->last_msg = kstrdup(buf.buf, GFP_KERNEL);
+
+ if (c->opts.ratelimit_errors &&
+ !(flags & FSCK_NO_RATELIMIT) &&
+ s->nr >= FSCK_ERR_RATELIMIT_NR) {
+ if (s->nr == FSCK_ERR_RATELIMIT_NR)
+ suppressing = true;
+ else
+ print = false;
+ }
+
+ s->nr++;
+ }
+
+#ifdef BCACHEFS_LOG_PREFIX
+ if (!strncmp(fmt, "bcachefs:", 9))
+ prt_printf(out, bch2_log_msg(c, ""));
+#endif
+
+ if (test_bit(BCH_FS_FSCK_DONE, &c->flags)) {
+ if (c->opts.errors != BCH_ON_ERROR_continue ||
+ !(flags & (FSCK_CAN_FIX|FSCK_CAN_IGNORE))) {
+ prt_str(out, ", shutting down");
+ inconsistent = true;
+ ret = -BCH_ERR_fsck_errors_not_fixed;
+ } else if (flags & FSCK_CAN_FIX) {
+ prt_str(out, ", fixing");
+ ret = -BCH_ERR_fsck_fix;
+ } else {
+ prt_str(out, ", continuing");
+ ret = -BCH_ERR_fsck_ignore;
+ }
+ } else if (c->opts.fix_errors == FSCK_FIX_exit) {
+ prt_str(out, ", exiting");
+ ret = -BCH_ERR_fsck_errors_not_fixed;
+ } else if (flags & FSCK_CAN_FIX) {
+ int fix = s && s->fix
+ ? s->fix
+ : c->opts.fix_errors;
+
+ if (fix == FSCK_FIX_ask) {
+ int ask;
+
+ prt_str(out, ": fix?");
+ bch2_print_string_as_lines(KERN_ERR, out->buf);
+ print = false;
+
+ ask = bch2_fsck_ask_yn();
+
+ if (ask >= YN_ALLNO && s)
+ s->fix = ask == YN_ALLNO
+ ? FSCK_FIX_no
+ : FSCK_FIX_yes;
+
+ ret = ask & 1
+ ? -BCH_ERR_fsck_fix
+ : -BCH_ERR_fsck_ignore;
+ } else if (fix == FSCK_FIX_yes ||
+ (c->opts.nochanges &&
+ !(flags & FSCK_CAN_IGNORE))) {
+ prt_str(out, ", fixing");
+ ret = -BCH_ERR_fsck_fix;
+ } else {
+ prt_str(out, ", not fixing");
+ }
+ } else if (flags & FSCK_NEED_FSCK) {
+ prt_str(out, " (run fsck to correct)");
+ } else {
+ prt_str(out, " (repair unimplemented)");
+ }
+
+ if (ret == -BCH_ERR_fsck_ignore &&
+ (c->opts.fix_errors == FSCK_FIX_exit ||
+ !(flags & FSCK_CAN_IGNORE)))
+ ret = -BCH_ERR_fsck_errors_not_fixed;
+
+ if (print)
+ bch2_print_string_as_lines(KERN_ERR, out->buf);
+
+ if (!test_bit(BCH_FS_FSCK_DONE, &c->flags) &&
+ (ret != -BCH_ERR_fsck_fix &&
+ ret != -BCH_ERR_fsck_ignore))
+ bch_err(c, "Unable to continue, halting");
+ else if (suppressing)
+ bch_err(c, "Ratelimiting new instances of previous error");
+
+ if (s)
+ s->ret = ret;
+
+ mutex_unlock(&c->fsck_error_msgs_lock);
+
+ printbuf_exit(&buf);
+
+ if (inconsistent)
+ bch2_inconsistent_error(c);
+
+ if (ret == -BCH_ERR_fsck_fix) {
+ set_bit(BCH_FS_ERRORS_FIXED, &c->flags);
+ } else {
+ set_bit(BCH_FS_ERRORS_NOT_FIXED, &c->flags);
+ set_bit(BCH_FS_ERROR, &c->flags);
+ }
+
+ return ret;
+}
+
+void bch2_flush_fsck_errs(struct bch_fs *c)
+{
+ struct fsck_err_state *s, *n;
+
+ mutex_lock(&c->fsck_error_msgs_lock);
+
+ list_for_each_entry_safe(s, n, &c->fsck_error_msgs, list) {
+ if (s->ratelimited && s->last_msg)
+ bch_err(c, "Saw %llu errors like:\n %s", s->nr, s->last_msg);
+
+ list_del(&s->list);
+ kfree(s->last_msg);
+ kfree(s);
+ }
+
+ mutex_unlock(&c->fsck_error_msgs_lock);
+}