From: Dave Chinner <dchinner@xxxxxxxxxx>
We need to be able to change the way XFS behaviours in error
conditions depending on the type of underlying storage. This is
necessary for handling non-traditional block devices with extended
error cases, such as thin provisioned devices that can return ENOSPC
as an IO error.
Introduce the basic sysfs infrastructure needed to define and
configure error behaviours. This is done to be generic enough to
extend to configuring behaviour in other error conditions, such as
ENOMEM, which also has different desired behaviours according to
machine configuration.
Signed-off-by: Dave Chinner <dchinner@xxxxxxxxxx>
---
fs/xfs/xfs_mount.c | 10 +++++++++-
fs/xfs/xfs_mount.h | 27 ++++++++++++++++++++++++++
fs/xfs/xfs_sysfs.c | 56 +++++++++++++++++++++++++++++++++++++++++++++++++++++-
fs/xfs/xfs_sysfs.h | 3 +++
4 files changed, 94 insertions(+), 2 deletions(-)
diff --git a/fs/xfs/xfs_mount.c b/fs/xfs/xfs_mount.c
index 986290c..f6fb5e1 100644
--- a/fs/xfs/xfs_mount.c
+++ b/fs/xfs/xfs_mount.c
@@ -708,10 +708,15 @@ xfs_mountfs(
if (error)
goto out_remove_sysfs;
- error = xfs_uuid_mount(mp);
+ error = xfs_error_sysfs_init(mp);
if (error)
goto out_del_stats;
+
+ error = xfs_uuid_mount(mp);
+ if (error)
+ goto out_remove_error_sysfs;
+
/*
* Set the minimum read and write sizes
*/
@@ -986,6 +991,8 @@ xfs_mountfs(
xfs_da_unmount(mp);
out_remove_uuid:
xfs_uuid_unmount(mp);
+ out_remove_error_sysfs:
+ xfs_error_sysfs_del(mp);
out_del_stats:
xfs_sysfs_del(&mp->m_stats.xs_kobj);
out_remove_sysfs:
@@ -1074,6 +1081,7 @@ xfs_unmountfs(
#endif
xfs_free_perag(mp);
+ xfs_error_sysfs_del(mp);
xfs_sysfs_del(&mp->m_stats.xs_kobj);
xfs_sysfs_del(&mp->m_kobj);
}
diff --git a/fs/xfs/xfs_mount.h b/fs/xfs/xfs_mount.h
index b570984..96c9658 100644
--- a/fs/xfs/xfs_mount.h
+++ b/fs/xfs/xfs_mount.h
@@ -37,6 +37,31 @@ enum {
XFS_LOWSP_MAX,
};
+/*
+ * Error Configuration
+ *
+ * Error classes define the subsystem the configuration belongs to.
+ * Error numbers define the errors that are configurable.
+ * Failure types describe when an error is considered fatal.
+ */
+enum {
+ XFS_ERR_CLASS_MAX,
+};
+enum {
+ XFS_ERR_ERRNO_MAX,
+};
+enum {
+ XFS_ERR_FAIL_DEFAULT,
+ XFS_ERR_FAIL_NEVER,
+ XFS_ERR_FAIL_SLOW,
+ XFS_ERR_FAIL_FAST,
+};
+
+struct xfs_error_cfg {
+ struct xfs_kobj kobj;
+ int fail_speed;
+};
+
typedef struct xfs_mount {
struct super_block *m_super;
xfs_tid_t m_tid; /* next unused tid for fs */
@@ -127,6 +152,8 @@ typedef struct xfs_mount {
int64_t m_low_space[XFS_LOWSP_MAX];
/* low free space thresholds */
struct xfs_kobj m_kobj;
+ struct xfs_kobj m_error_kobj;
+ struct xfs_error_cfg m_error_cfg[XFS_ERR_CLASS_MAX][XFS_ERR_ERRNO_MAX];
struct xstats m_stats; /* per-fs stats */
struct workqueue_struct *m_buf_workqueue;
diff --git a/fs/xfs/xfs_sysfs.c b/fs/xfs/xfs_sysfs.c
index 641d625..7d81c1b 100644
--- a/fs/xfs/xfs_sysfs.c
+++ b/fs/xfs/xfs_sysfs.c
@@ -17,11 +17,15 @@
*/
#include "xfs.h"
-#include "xfs_sysfs.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;
@@ -304,3 +308,53 @@ struct kobj_type xfs_log_ktype = {
.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 use 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 struct attribute *xfs_error_attrs[] = {
+ NULL,
+};
+
+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);
+}
+
+struct kobj_type xfs_error_cfg_ktype = {
+ .release = xfs_sysfs_release,
+ .sysfs_ops = &xfs_sysfs_ops,
+ .default_attrs = xfs_error_attrs,
+};
+
+struct kobj_type xfs_error_ktype = {
+ .release = xfs_sysfs_release,
+};
+
+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");
+ return error;
+}
+
+void
+xfs_error_sysfs_del(
+ struct xfs_mount *mp)
+{
+ xfs_sysfs_del(&mp->m_error_kobj);
+}
diff --git a/fs/xfs/xfs_sysfs.h b/fs/xfs/xfs_sysfs.h
index be692e5..d046371 100644
--- a/fs/xfs/xfs_sysfs.h
+++ b/fs/xfs/xfs_sysfs.h
@@ -58,4 +58,7 @@ xfs_sysfs_del(
wait_for_completion(&kobj->complete);
}
+int xfs_error_sysfs_init(struct xfs_mount *mp);
+void xfs_error_sysfs_del(struct xfs_mount *mp);
+
#endif /* __XFS_SYSFS_H__ */
--
2.5.0
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