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exofs: Recover in the case of read-passed-end-of-file 

In check_io, implement the case of reading passed end of
file, by clearing the pages and recover with no error. In
a raid arrangement this can become a legitimate situation
in case of holes in the file.

Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
This commit is contained in:
Boaz Harrosh 2010-01-19 19:24:45 +02:00
parent 518f167a37
commit 22ddc55638
1 changed files with 30 additions and 6 deletions
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36
fs/exofs/ios.c
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@ -173,6 +173,21 @@ static int exofs_io_execute(struct exofs_io_state *ios)
return ret;
}
static void _clear_bio(struct bio *bio)
{
struct bio_vec *bv;
unsigned i;
__bio_for_each_segment(bv, bio, i, 0) {
unsigned this_count = bv->bv_len;
if (likely(PAGE_SIZE == this_count))
clear_highpage(bv->bv_page);
else
zero_user(bv->bv_page, bv->bv_offset, this_count);
}
}
int exofs_check_io(struct exofs_io_state *ios, u64 *resid)
{
enum osd_err_priority acumulated_osd_err = 0;
@ -181,16 +196,25 @@ int exofs_check_io(struct exofs_io_state *ios, u64 *resid)
for (i = 0; i < ios->numdevs; i++) {
struct osd_sense_info osi;
int ret = osd_req_decode_sense(ios->per_dev[i].or, &osi);
struct osd_request *or = ios->per_dev[i].or;
int ret;
if (unlikely(!or))
continue;
ret = osd_req_decode_sense(or, &osi);
if (likely(!ret))
continue;
if (unlikely(ret == -EFAULT)) {
EXOFS_DBGMSG("%s: EFAULT Need page clear\n", __func__);
/*FIXME: All the pages in this device range should:
* clear_highpage(page);
*/
if (OSD_ERR_PRI_CLEAR_PAGES == osi.osd_err_pri) {
/* start read offset passed endof file */
_clear_bio(ios->per_dev[i].bio);
EXOFS_DBGMSG("start read offset passed end of file "
"offset=0x%llx, length=0x%llx\n",
_LLU(ios->offset),
_LLU(ios->length));
continue; /* we recovered */
}
if (osi.osd_err_pri >= acumulated_osd_err) {