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[PATCH] libata-eh: implement dev->ering

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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>
This commit is contained in:
Tejun Heo 2006-05-15 20:58:19 +09:00
parent 9be1e979f2
commit 0c247c559c
2 changed files with 62 additions and 0 deletions
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45
drivers/scsi/libata-eh.c
View File

@ -46,6 +46,51 @@
static void __ata_port_freeze(struct ata_port *ap);
static void ata_ering_record(struct ata_ering *ering, int is_io,
unsigned int err_mask)
{
struct ata_ering_entry *ent;
WARN_ON(!err_mask);
ering->cursor++;
ering->cursor %= ATA_ERING_SIZE;
ent = &ering->ring[ering->cursor];
ent->is_io = is_io;
ent->err_mask = err_mask;
ent->timestamp = get_jiffies_64();
}
static struct ata_ering_entry * ata_ering_top(struct ata_ering *ering)
{
struct ata_ering_entry *ent = &ering->ring[ering->cursor];
if (!ent->err_mask)
return NULL;
return ent;
}
static int ata_ering_map(struct ata_ering *ering,
int (*map_fn)(struct ata_ering_entry *, void *),
void *arg)
{
int idx, rc = 0;
struct ata_ering_entry *ent;
idx = ering->cursor;
do {
ent = &ering->ring[idx];
if (!ent->err_mask)
break;
rc = map_fn(ent, arg);
if (rc)
break;
idx = (idx - 1 + ATA_ERING_SIZE) % ATA_ERING_SIZE;
} while (idx != ering->cursor);
return rc;
}
/**
* ata_scsi_timed_out - SCSI layer time out callback
* @cmd: timed out SCSI command

17
include/linux/libata.h
View File

@ -226,6 +226,9 @@ enum {
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 @@ struct ata_host_stats {
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 @@ struct ata_device {
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 {