[PATCH] libata-eh: implement dev->ering
This patch implements ata_ering and uses it to define dev->ering.
ata_ering is a ring buffer which records libata errors - whether a
command was for normar IO request, err_mask and timestamp. Errors are
recorded per-device in dev->ering. This will be used by EH to
determine recovery actions.
Signed-off-by: Tejun Heo <htejun@gmail.com>
diff --git a/include/linux/libata.h b/include/linux/libata.h
index 6fe5ed8..f5cea13 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -226,6 +226,9 @@
ATA_PORT_PRIMARY = (1 << 0),
ATA_PORT_SECONDARY = (1 << 1),
+ /* ering size */
+ ATA_ERING_SIZE = 32,
+
/* reset / recovery action types */
ATA_EH_REVALIDATE = (1 << 0),
ATA_EH_SOFTRESET = (1 << 1),
@@ -375,6 +378,17 @@
unsigned long rw_reqbuf;
};
+struct ata_ering_entry {
+ int is_io;
+ unsigned int err_mask;
+ u64 timestamp;
+};
+
+struct ata_ering {
+ int cursor;
+ struct ata_ering_entry ring[ATA_ERING_SIZE];
+};
+
struct ata_device {
struct ata_port *ap;
u64 n_sectors; /* size of device, if ATA */
@@ -401,6 +415,9 @@
u16 cylinders; /* Number of cylinders */
u16 heads; /* Number of heads */
u16 sectors; /* Number of sectors per track */
+
+ /* error history */
+ struct ata_ering ering;
};
struct ata_port {