ore/exofs: Change ore_check_io API
Current ore_check_io API receives a residual
pointer, to report partial IO. But it is actually
not used, because in a multiple devices IO there
is never a linearity in the IO failure.
On the other hand if every failing device is reported
through a received callback measures can be taken to
handle only failed devices. One at a time.
This will also be needed by the objects-layout-driver
for it's error reporting facility.
Exofs is not currently using the new information and
keeps the old behaviour of failing the complete IO in
case of an error. (No partial completion)
TODO: Use an ore_check_io callback to set_page_error only
the failing pages. And re-dirty write pages.
Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
diff --git a/fs/exofs/inode.c b/fs/exofs/inode.c
index 5a62420..86c0ac8 100644
--- a/fs/exofs/inode.c
+++ b/fs/exofs/inode.c
@@ -194,19 +194,16 @@
static int __readpages_done(struct page_collect *pcol)
{
int i;
- u64 resid;
u64 good_bytes;
u64 length = 0;
- int ret = ore_check_io(pcol->ios, &resid);
+ int ret = ore_check_io(pcol->ios, NULL);
if (likely(!ret)) {
good_bytes = pcol->length;
ret = PAGE_WAS_NOT_IN_IO;
} else {
- good_bytes = pcol->length - resid;
+ good_bytes = 0;
}
- if (good_bytes > pcol->ios->length)
- good_bytes = pcol->ios->length;
EXOFS_DBGMSG2("readpages_done(0x%lx) good_bytes=0x%llx"
" length=0x%lx nr_pages=%u\n",
@@ -519,10 +516,9 @@
{
struct page_collect *pcol = p;
int i;
- u64 resid;
u64 good_bytes;
u64 length = 0;
- int ret = ore_check_io(ios, &resid);
+ int ret = ore_check_io(ios, NULL);
atomic_dec(&pcol->sbi->s_curr_pending);
@@ -530,10 +526,8 @@
good_bytes = pcol->length;
ret = PAGE_WAS_NOT_IN_IO;
} else {
- good_bytes = pcol->length - resid;
+ good_bytes = 0;
}
- if (good_bytes > pcol->ios->length)
- good_bytes = pcol->ios->length;
EXOFS_DBGMSG2("writepages_done(0x%lx) good_bytes=0x%llx"
" length=0x%lx nr_pages=%u\n",
diff --git a/fs/exofs/ore.c b/fs/exofs/ore.c
index 4ca59d4..3b1cc3a 100644
--- a/fs/exofs/ore.c
+++ b/fs/exofs/ore.c
@@ -317,7 +317,7 @@
}
}
-int ore_check_io(struct ore_io_state *ios, u64 *resid)
+int ore_check_io(struct ore_io_state *ios, ore_on_dev_error on_dev_error)
{
enum osd_err_priority acumulated_osd_err = 0;
int acumulated_lin_err = 0;
@@ -325,7 +325,8 @@
for (i = 0; i < ios->numdevs; i++) {
struct osd_sense_info osi;
- struct osd_request *or = ios->per_dev[i].or;
+ struct ore_per_dev_state *per_dev = &ios->per_dev[i];
+ struct osd_request *or = per_dev->or;
int ret;
if (unlikely(!or))
@@ -337,29 +338,31 @@
if (OSD_ERR_PRI_CLEAR_PAGES == osi.osd_err_pri) {
/* start read offset passed endof file */
- _clear_bio(ios->per_dev[i].bio);
+ _clear_bio(per_dev->bio);
ORE_DBGMSG("start read offset passed end of file "
"offset=0x%llx, length=0x%llx\n",
- _LLU(ios->per_dev[i].offset),
- _LLU(ios->per_dev[i].length));
+ _LLU(per_dev->offset),
+ _LLU(per_dev->length));
continue; /* we recovered */
}
+ if (on_dev_error) {
+ u64 residual = ios->reading ?
+ or->in.residual : or->out.residual;
+ u64 offset = (ios->offset + ios->length) - residual;
+ struct ore_dev *od = ios->oc->ods[
+ per_dev->dev - ios->oc->first_dev];
+
+ on_dev_error(ios, od, per_dev->dev, osi.osd_err_pri,
+ offset, residual);
+ }
if (osi.osd_err_pri >= acumulated_osd_err) {
acumulated_osd_err = osi.osd_err_pri;
acumulated_lin_err = ret;
}
}
- /* TODO: raid specific residual calculations */
- if (resid) {
- if (likely(!acumulated_lin_err))
- *resid = 0;
- else
- *resid = ios->length;
- }
-
return acumulated_lin_err;
}
EXPORT_SYMBOL(ore_check_io);
diff --git a/include/scsi/osd_ore.h b/include/scsi/osd_ore.h
index 716dbea..af2231a 100644
--- a/include/scsi/osd_ore.h
+++ b/include/scsi/osd_ore.h
@@ -153,7 +153,10 @@
struct ore_io_state **ios);
void ore_put_io_state(struct ore_io_state *ios);
-int ore_check_io(struct ore_io_state *ios, u64 *resid);
+typedef void (*ore_on_dev_error)(struct ore_io_state *ios, struct ore_dev *od,
+ unsigned dev_index, enum osd_err_priority oep,
+ u64 dev_offset, u64 dev_len);
+int ore_check_io(struct ore_io_state *ios, ore_on_dev_error rep);
int ore_create(struct ore_io_state *ios);
int ore_remove(struct ore_io_state *ios);