xfs: introduce metadata IO error class

Now we have the basic infrastructure, add the first error class so
we can build up the infrastructure in a meaningful way. Add the
metadata async write IO error class and sysfs entry, and introduce a
default configuration that matches the existing "retry forever"
behavior for async write metadata buffers.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Carlos Maiolino <cmaiolino@redhat.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>

2 files changed, 37 insertions, 0 deletions

diff --git a/fs/xfs/xfs_mount.h b/fs/xfs/xfs_mount.h
index d639795b0310..352a5c88d7e9 100644
--- a/fs/xfs/xfs_mount.h
+++ b/fs/xfs/xfs_mount.h
@@ -44,9 +44,11 @@ enum {
  * Error numbers define the errors that are configurable.
  */
 enum {
+        XFS_ERR_METADATA,
         XFS_ERR_CLASS_MAX,
 };
 enum {
+        XFS_ERR_DEFAULT,
         XFS_ERR_ERRNO_MAX,
 };
 
@@ -146,6 +148,7 @@ typedef struct xfs_mount {
                                                 /* low free space thresholds */
         struct xfs_kobj         m_kobj;
         struct xfs_kobj         m_error_kobj;
+        struct xfs_kobj         m_error_meta_kobj;
         struct xfs_error_cfg    m_error_cfg[XFS_ERR_CLASS_MAX][XFS_ERR_ERRNO_MAX];
         struct xstats           m_stats;        /* per-fs stats */
 
diff --git a/fs/xfs/xfs_sysfs.c b/fs/xfs/xfs_sysfs.c
index 74e394071242..07c95999541e 100644
--- a/fs/xfs/xfs_sysfs.c
+++ b/fs/xfs/xfs_sysfs.c
@@ -399,11 +399,34 @@ int
 xfs_error_sysfs_init(
         struct xfs_mount        *mp)
 {
+        struct xfs_error_cfg    *cfg;
         int                     error;
 
         /* .../xfs/<dev>/error/ */
         error = xfs_sysfs_init(&mp->m_error_kobj, &xfs_error_ktype,
                                 &mp->m_kobj, "error");
+        if (error)
+                return error;
+
+        /* .../xfs/<dev>/error/metadata/ */
+        error = xfs_sysfs_init(&mp->m_error_meta_kobj, &xfs_error_ktype,
+                                &mp->m_error_kobj, "metadata");
+        if (error)
+                goto out_error;
+
+        cfg = &mp->m_error_cfg[XFS_ERR_METADATA][XFS_ERR_DEFAULT];
+        error = xfs_sysfs_init(&cfg->kobj, &xfs_error_cfg_ktype,
+                                &mp->m_error_meta_kobj, "default");
+        if (error)
+                goto out_error_meta;
+        cfg->max_retries = -1;
+
+        return 0;
+
+out_error_meta:
+        xfs_sysfs_del(&mp->m_error_meta_kobj);
+out_error:
+        xfs_sysfs_del(&mp->m_error_kobj);
         return error;
 }
 
@@ -411,5 +434,16 @@ 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);
 }