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