v4.19.13 snapshot.
diff --git a/fs/xfs/xfs_sysfs.c b/fs/xfs/xfs_sysfs.c
new file mode 100644
index 0000000..cd6a994
--- /dev/null
+++ b/fs/xfs/xfs_sysfs.c
@@ -0,0 +1,653 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2014 Red Hat, Inc.
+ * All Rights Reserved.
+ */
+
+#include "xfs.h"
+#include "xfs_shared.h"
+#include "xfs_format.h"
+#include "xfs_log_format.h"
+#include "xfs_trans_resv.h"
+#include "xfs_sysfs.h"
+#include "xfs_log.h"
+#include "xfs_log_priv.h"
+#include "xfs_stats.h"
+#include "xfs_mount.h"
+
+struct xfs_sysfs_attr {
+ struct attribute attr;
+ ssize_t (*show)(struct kobject *kobject, char *buf);
+ ssize_t (*store)(struct kobject *kobject, const char *buf,
+ size_t count);
+};
+
+static inline struct xfs_sysfs_attr *
+to_attr(struct attribute *attr)
+{
+ return container_of(attr, struct xfs_sysfs_attr, attr);
+}
+
+#define XFS_SYSFS_ATTR_RW(name) \
+ static struct xfs_sysfs_attr xfs_sysfs_attr_##name = __ATTR_RW(name)
+#define XFS_SYSFS_ATTR_RO(name) \
+ static struct xfs_sysfs_attr xfs_sysfs_attr_##name = __ATTR_RO(name)
+#define XFS_SYSFS_ATTR_WO(name) \
+ static struct xfs_sysfs_attr xfs_sysfs_attr_##name = __ATTR_WO(name)
+
+#define ATTR_LIST(name) &xfs_sysfs_attr_##name.attr
+
+STATIC ssize_t
+xfs_sysfs_object_show(
+ struct kobject *kobject,
+ struct attribute *attr,
+ char *buf)
+{
+ struct xfs_sysfs_attr *xfs_attr = to_attr(attr);
+
+ return xfs_attr->show ? xfs_attr->show(kobject, buf) : 0;
+}
+
+STATIC ssize_t
+xfs_sysfs_object_store(
+ struct kobject *kobject,
+ struct attribute *attr,
+ const char *buf,
+ size_t count)
+{
+ struct xfs_sysfs_attr *xfs_attr = to_attr(attr);
+
+ return xfs_attr->store ? xfs_attr->store(kobject, buf, count) : 0;
+}
+
+static const struct sysfs_ops xfs_sysfs_ops = {
+ .show = xfs_sysfs_object_show,
+ .store = xfs_sysfs_object_store,
+};
+
+/*
+ * xfs_mount kobject. The mp kobject also serves as the per-mount parent object
+ * that is identified by the fsname under sysfs.
+ */
+
+static inline struct xfs_mount *
+to_mp(struct kobject *kobject)
+{
+ struct xfs_kobj *kobj = to_kobj(kobject);
+
+ return container_of(kobj, struct xfs_mount, m_kobj);
+}
+
+static struct attribute *xfs_mp_attrs[] = {
+ NULL,
+};
+
+struct kobj_type xfs_mp_ktype = {
+ .release = xfs_sysfs_release,
+ .sysfs_ops = &xfs_sysfs_ops,
+ .default_attrs = xfs_mp_attrs,
+};
+
+#ifdef DEBUG
+/* debug */
+
+STATIC ssize_t
+bug_on_assert_store(
+ struct kobject *kobject,
+ const char *buf,
+ size_t count)
+{
+ int ret;
+ int val;
+
+ ret = kstrtoint(buf, 0, &val);
+ if (ret)
+ return ret;
+
+ if (val == 1)
+ xfs_globals.bug_on_assert = true;
+ else if (val == 0)
+ xfs_globals.bug_on_assert = false;
+ else
+ return -EINVAL;
+
+ return count;
+}
+
+STATIC ssize_t
+bug_on_assert_show(
+ struct kobject *kobject,
+ char *buf)
+{
+ return snprintf(buf, PAGE_SIZE, "%d\n", xfs_globals.bug_on_assert ? 1 : 0);
+}
+XFS_SYSFS_ATTR_RW(bug_on_assert);
+
+STATIC ssize_t
+log_recovery_delay_store(
+ struct kobject *kobject,
+ const char *buf,
+ size_t count)
+{
+ int ret;
+ int val;
+
+ ret = kstrtoint(buf, 0, &val);
+ if (ret)
+ return ret;
+
+ if (val < 0 || val > 60)
+ return -EINVAL;
+
+ xfs_globals.log_recovery_delay = val;
+
+ return count;
+}
+
+STATIC ssize_t
+log_recovery_delay_show(
+ struct kobject *kobject,
+ char *buf)
+{
+ return snprintf(buf, PAGE_SIZE, "%d\n", xfs_globals.log_recovery_delay);
+}
+XFS_SYSFS_ATTR_RW(log_recovery_delay);
+
+STATIC ssize_t
+mount_delay_store(
+ struct kobject *kobject,
+ const char *buf,
+ size_t count)
+{
+ int ret;
+ int val;
+
+ ret = kstrtoint(buf, 0, &val);
+ if (ret)
+ return ret;
+
+ if (val < 0 || val > 60)
+ return -EINVAL;
+
+ xfs_globals.mount_delay = val;
+
+ return count;
+}
+
+STATIC ssize_t
+mount_delay_show(
+ struct kobject *kobject,
+ char *buf)
+{
+ return snprintf(buf, PAGE_SIZE, "%d\n", xfs_globals.mount_delay);
+}
+XFS_SYSFS_ATTR_RW(mount_delay);
+
+static struct attribute *xfs_dbg_attrs[] = {
+ ATTR_LIST(bug_on_assert),
+ ATTR_LIST(log_recovery_delay),
+ ATTR_LIST(mount_delay),
+ NULL,
+};
+
+struct kobj_type xfs_dbg_ktype = {
+ .release = xfs_sysfs_release,
+ .sysfs_ops = &xfs_sysfs_ops,
+ .default_attrs = xfs_dbg_attrs,
+};
+
+#endif /* DEBUG */
+
+/* stats */
+
+static inline struct xstats *
+to_xstats(struct kobject *kobject)
+{
+ struct xfs_kobj *kobj = to_kobj(kobject);
+
+ return container_of(kobj, struct xstats, xs_kobj);
+}
+
+STATIC ssize_t
+stats_show(
+ struct kobject *kobject,
+ char *buf)
+{
+ struct xstats *stats = to_xstats(kobject);
+
+ return xfs_stats_format(stats->xs_stats, buf);
+}
+XFS_SYSFS_ATTR_RO(stats);
+
+STATIC ssize_t
+stats_clear_store(
+ struct kobject *kobject,
+ const char *buf,
+ size_t count)
+{
+ int ret;
+ int val;
+ struct xstats *stats = to_xstats(kobject);
+
+ ret = kstrtoint(buf, 0, &val);
+ if (ret)
+ return ret;
+
+ if (val != 1)
+ return -EINVAL;
+
+ xfs_stats_clearall(stats->xs_stats);
+ return count;
+}
+XFS_SYSFS_ATTR_WO(stats_clear);
+
+static struct attribute *xfs_stats_attrs[] = {
+ ATTR_LIST(stats),
+ ATTR_LIST(stats_clear),
+ NULL,
+};
+
+struct kobj_type xfs_stats_ktype = {
+ .release = xfs_sysfs_release,
+ .sysfs_ops = &xfs_sysfs_ops,
+ .default_attrs = xfs_stats_attrs,
+};
+
+/* xlog */
+
+static inline struct xlog *
+to_xlog(struct kobject *kobject)
+{
+ struct xfs_kobj *kobj = to_kobj(kobject);
+
+ return container_of(kobj, struct xlog, l_kobj);
+}
+
+STATIC ssize_t
+log_head_lsn_show(
+ struct kobject *kobject,
+ char *buf)
+{
+ int cycle;
+ int block;
+ struct xlog *log = to_xlog(kobject);
+
+ spin_lock(&log->l_icloglock);
+ cycle = log->l_curr_cycle;
+ block = log->l_curr_block;
+ spin_unlock(&log->l_icloglock);
+
+ return snprintf(buf, PAGE_SIZE, "%d:%d\n", cycle, block);
+}
+XFS_SYSFS_ATTR_RO(log_head_lsn);
+
+STATIC ssize_t
+log_tail_lsn_show(
+ struct kobject *kobject,
+ char *buf)
+{
+ int cycle;
+ int block;
+ struct xlog *log = to_xlog(kobject);
+
+ xlog_crack_atomic_lsn(&log->l_tail_lsn, &cycle, &block);
+ return snprintf(buf, PAGE_SIZE, "%d:%d\n", cycle, block);
+}
+XFS_SYSFS_ATTR_RO(log_tail_lsn);
+
+STATIC ssize_t
+reserve_grant_head_show(
+ struct kobject *kobject,
+ char *buf)
+
+{
+ int cycle;
+ int bytes;
+ struct xlog *log = to_xlog(kobject);
+
+ xlog_crack_grant_head(&log->l_reserve_head.grant, &cycle, &bytes);
+ return snprintf(buf, PAGE_SIZE, "%d:%d\n", cycle, bytes);
+}
+XFS_SYSFS_ATTR_RO(reserve_grant_head);
+
+STATIC ssize_t
+write_grant_head_show(
+ struct kobject *kobject,
+ char *buf)
+{
+ int cycle;
+ int bytes;
+ struct xlog *log = to_xlog(kobject);
+
+ xlog_crack_grant_head(&log->l_write_head.grant, &cycle, &bytes);
+ return snprintf(buf, PAGE_SIZE, "%d:%d\n", cycle, bytes);
+}
+XFS_SYSFS_ATTR_RO(write_grant_head);
+
+static struct attribute *xfs_log_attrs[] = {
+ ATTR_LIST(log_head_lsn),
+ ATTR_LIST(log_tail_lsn),
+ ATTR_LIST(reserve_grant_head),
+ ATTR_LIST(write_grant_head),
+ NULL,
+};
+
+struct kobj_type xfs_log_ktype = {
+ .release = xfs_sysfs_release,
+ .sysfs_ops = &xfs_sysfs_ops,
+ .default_attrs = xfs_log_attrs,
+};
+
+/*
+ * Metadata IO error configuration
+ *
+ * The sysfs structure here is:
+ * ...xfs/<dev>/error/<class>/<errno>/<error_attrs>
+ *
+ * where <class> allows us to discriminate between data IO and metadata IO,
+ * and any other future type of IO (e.g. special inode or directory error
+ * handling) we care to support.
+ */
+static inline struct xfs_error_cfg *
+to_error_cfg(struct kobject *kobject)
+{
+ struct xfs_kobj *kobj = to_kobj(kobject);
+ return container_of(kobj, struct xfs_error_cfg, kobj);
+}
+
+static inline struct xfs_mount *
+err_to_mp(struct kobject *kobject)
+{
+ struct xfs_kobj *kobj = to_kobj(kobject);
+ return container_of(kobj, struct xfs_mount, m_error_kobj);
+}
+
+static ssize_t
+max_retries_show(
+ struct kobject *kobject,
+ char *buf)
+{
+ int retries;
+ struct xfs_error_cfg *cfg = to_error_cfg(kobject);
+
+ if (cfg->max_retries == XFS_ERR_RETRY_FOREVER)
+ retries = -1;
+ else
+ retries = cfg->max_retries;
+
+ return snprintf(buf, PAGE_SIZE, "%d\n", retries);
+}
+
+static ssize_t
+max_retries_store(
+ struct kobject *kobject,
+ const char *buf,
+ size_t count)
+{
+ struct xfs_error_cfg *cfg = to_error_cfg(kobject);
+ int ret;
+ int val;
+
+ ret = kstrtoint(buf, 0, &val);
+ if (ret)
+ return ret;
+
+ if (val < -1)
+ return -EINVAL;
+
+ if (val == -1)
+ cfg->max_retries = XFS_ERR_RETRY_FOREVER;
+ else
+ cfg->max_retries = val;
+ return count;
+}
+XFS_SYSFS_ATTR_RW(max_retries);
+
+static ssize_t
+retry_timeout_seconds_show(
+ struct kobject *kobject,
+ char *buf)
+{
+ int timeout;
+ struct xfs_error_cfg *cfg = to_error_cfg(kobject);
+
+ if (cfg->retry_timeout == XFS_ERR_RETRY_FOREVER)
+ timeout = -1;
+ else
+ timeout = jiffies_to_msecs(cfg->retry_timeout) / MSEC_PER_SEC;
+
+ return snprintf(buf, PAGE_SIZE, "%d\n", timeout);
+}
+
+static ssize_t
+retry_timeout_seconds_store(
+ struct kobject *kobject,
+ const char *buf,
+ size_t count)
+{
+ struct xfs_error_cfg *cfg = to_error_cfg(kobject);
+ int ret;
+ int val;
+
+ ret = kstrtoint(buf, 0, &val);
+ if (ret)
+ return ret;
+
+ /* 1 day timeout maximum, -1 means infinite */
+ if (val < -1 || val > 86400)
+ return -EINVAL;
+
+ if (val == -1)
+ cfg->retry_timeout = XFS_ERR_RETRY_FOREVER;
+ else {
+ cfg->retry_timeout = msecs_to_jiffies(val * MSEC_PER_SEC);
+ ASSERT(msecs_to_jiffies(val * MSEC_PER_SEC) < LONG_MAX);
+ }
+ return count;
+}
+XFS_SYSFS_ATTR_RW(retry_timeout_seconds);
+
+static ssize_t
+fail_at_unmount_show(
+ struct kobject *kobject,
+ char *buf)
+{
+ struct xfs_mount *mp = err_to_mp(kobject);
+
+ return snprintf(buf, PAGE_SIZE, "%d\n", mp->m_fail_unmount);
+}
+
+static ssize_t
+fail_at_unmount_store(
+ struct kobject *kobject,
+ const char *buf,
+ size_t count)
+{
+ struct xfs_mount *mp = err_to_mp(kobject);
+ int ret;
+ int val;
+
+ ret = kstrtoint(buf, 0, &val);
+ if (ret)
+ return ret;
+
+ if (val < 0 || val > 1)
+ return -EINVAL;
+
+ mp->m_fail_unmount = val;
+ return count;
+}
+XFS_SYSFS_ATTR_RW(fail_at_unmount);
+
+static struct attribute *xfs_error_attrs[] = {
+ ATTR_LIST(max_retries),
+ ATTR_LIST(retry_timeout_seconds),
+ NULL,
+};
+
+
+static struct kobj_type xfs_error_cfg_ktype = {
+ .release = xfs_sysfs_release,
+ .sysfs_ops = &xfs_sysfs_ops,
+ .default_attrs = xfs_error_attrs,
+};
+
+static struct kobj_type xfs_error_ktype = {
+ .release = xfs_sysfs_release,
+ .sysfs_ops = &xfs_sysfs_ops,
+};
+
+/*
+ * Error initialization tables. These need to be ordered in the same
+ * order as the enums used to index the array. All class init tables need to
+ * define a "default" behaviour as the first entry, all other entries can be
+ * empty.
+ */
+struct xfs_error_init {
+ char *name;
+ int max_retries;
+ int retry_timeout; /* in seconds */
+};
+
+static const struct xfs_error_init xfs_error_meta_init[XFS_ERR_ERRNO_MAX] = {
+ { .name = "default",
+ .max_retries = XFS_ERR_RETRY_FOREVER,
+ .retry_timeout = XFS_ERR_RETRY_FOREVER,
+ },
+ { .name = "EIO",
+ .max_retries = XFS_ERR_RETRY_FOREVER,
+ .retry_timeout = XFS_ERR_RETRY_FOREVER,
+ },
+ { .name = "ENOSPC",
+ .max_retries = XFS_ERR_RETRY_FOREVER,
+ .retry_timeout = XFS_ERR_RETRY_FOREVER,
+ },
+ { .name = "ENODEV",
+ .max_retries = 0, /* We can't recover from devices disappearing */
+ .retry_timeout = 0,
+ },
+};
+
+static int
+xfs_error_sysfs_init_class(
+ struct xfs_mount *mp,
+ int class,
+ const char *parent_name,
+ struct xfs_kobj *parent_kobj,
+ const struct xfs_error_init init[])
+{
+ struct xfs_error_cfg *cfg;
+ int error;
+ int i;
+
+ ASSERT(class < XFS_ERR_CLASS_MAX);
+
+ error = xfs_sysfs_init(parent_kobj, &xfs_error_ktype,
+ &mp->m_error_kobj, parent_name);
+ if (error)
+ return error;
+
+ for (i = 0; i < XFS_ERR_ERRNO_MAX; i++) {
+ cfg = &mp->m_error_cfg[class][i];
+ error = xfs_sysfs_init(&cfg->kobj, &xfs_error_cfg_ktype,
+ parent_kobj, init[i].name);
+ if (error)
+ goto out_error;
+
+ cfg->max_retries = init[i].max_retries;
+ if (init[i].retry_timeout == XFS_ERR_RETRY_FOREVER)
+ cfg->retry_timeout = XFS_ERR_RETRY_FOREVER;
+ else
+ cfg->retry_timeout = msecs_to_jiffies(
+ init[i].retry_timeout * MSEC_PER_SEC);
+ }
+ return 0;
+
+out_error:
+ /* unwind the entries that succeeded */
+ for (i--; i >= 0; i--) {
+ cfg = &mp->m_error_cfg[class][i];
+ xfs_sysfs_del(&cfg->kobj);
+ }
+ xfs_sysfs_del(parent_kobj);
+ return error;
+}
+
+int
+xfs_error_sysfs_init(
+ struct xfs_mount *mp)
+{
+ int error;
+
+ /* .../xfs/<dev>/error/ */
+ error = xfs_sysfs_init(&mp->m_error_kobj, &xfs_error_ktype,
+ &mp->m_kobj, "error");
+ if (error)
+ return error;
+
+ error = sysfs_create_file(&mp->m_error_kobj.kobject,
+ ATTR_LIST(fail_at_unmount));
+
+ if (error)
+ goto out_error;
+
+ /* .../xfs/<dev>/error/metadata/ */
+ error = xfs_error_sysfs_init_class(mp, XFS_ERR_METADATA,
+ "metadata", &mp->m_error_meta_kobj,
+ xfs_error_meta_init);
+ if (error)
+ goto out_error;
+
+ return 0;
+
+out_error:
+ xfs_sysfs_del(&mp->m_error_kobj);
+ return error;
+}
+
+void
+xfs_error_sysfs_del(
+ struct xfs_mount *mp)
+{
+ struct xfs_error_cfg *cfg;
+ int i, j;
+
+ for (i = 0; i < XFS_ERR_CLASS_MAX; i++) {
+ for (j = 0; j < XFS_ERR_ERRNO_MAX; j++) {
+ cfg = &mp->m_error_cfg[i][j];
+
+ xfs_sysfs_del(&cfg->kobj);
+ }
+ }
+ xfs_sysfs_del(&mp->m_error_meta_kobj);
+ xfs_sysfs_del(&mp->m_error_kobj);
+}
+
+struct xfs_error_cfg *
+xfs_error_get_cfg(
+ struct xfs_mount *mp,
+ int error_class,
+ int error)
+{
+ struct xfs_error_cfg *cfg;
+
+ if (error < 0)
+ error = -error;
+
+ switch (error) {
+ case EIO:
+ cfg = &mp->m_error_cfg[error_class][XFS_ERR_EIO];
+ break;
+ case ENOSPC:
+ cfg = &mp->m_error_cfg[error_class][XFS_ERR_ENOSPC];
+ break;
+ case ENODEV:
+ cfg = &mp->m_error_cfg[error_class][XFS_ERR_ENODEV];
+ break;
+ default:
+ cfg = &mp->m_error_cfg[error_class][XFS_ERR_DEFAULT];
+ break;
+ }
+
+ return cfg;
+}