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https://github.com/torvalds/linux.git
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46f4d973f6
The original idea was that a mirror read can be sub-divided to multiple devices. But this has very little gain and only at very large IOes so it's not going to be implemented soon. Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
463 lines
11 KiB
C
463 lines
11 KiB
C
/*
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* Copyright (C) 2005, 2006
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* Avishay Traeger (avishay@gmail.com)
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* Copyright (C) 2008, 2009
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* Boaz Harrosh <bharrosh@panasas.com>
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*
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* This file is part of exofs.
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*
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* exofs is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation. Since it is based on ext2, and the only
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* valid version of GPL for the Linux kernel is version 2, the only valid
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* version of GPL for exofs is version 2.
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*
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* exofs is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with exofs; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <scsi/scsi_device.h>
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#include "exofs.h"
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#define EXOFS_DBGMSG2(M...) do {} while (0)
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/* #define EXOFS_DBGMSG2 EXOFS_DBGMSG */
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void exofs_make_credential(u8 cred_a[OSD_CAP_LEN], const struct osd_obj_id *obj)
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{
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osd_sec_init_nosec_doall_caps(cred_a, obj, false, true);
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}
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int exofs_read_kern(struct osd_dev *od, u8 *cred, struct osd_obj_id *obj,
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u64 offset, void *p, unsigned length)
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{
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struct osd_request *or = osd_start_request(od, GFP_KERNEL);
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/* struct osd_sense_info osi = {.key = 0};*/
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int ret;
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if (unlikely(!or)) {
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EXOFS_DBGMSG("%s: osd_start_request failed.\n", __func__);
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return -ENOMEM;
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}
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ret = osd_req_read_kern(or, obj, offset, p, length);
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if (unlikely(ret)) {
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EXOFS_DBGMSG("%s: osd_req_read_kern failed.\n", __func__);
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goto out;
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}
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ret = osd_finalize_request(or, 0, cred, NULL);
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if (unlikely(ret)) {
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EXOFS_DBGMSG("Faild to osd_finalize_request() => %d\n", ret);
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goto out;
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}
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ret = osd_execute_request(or);
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if (unlikely(ret))
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EXOFS_DBGMSG("osd_execute_request() => %d\n", ret);
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/* osd_req_decode_sense(or, ret); */
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out:
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osd_end_request(or);
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return ret;
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}
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int exofs_get_io_state(struct exofs_layout *layout,
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struct exofs_io_state **pios)
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{
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struct exofs_io_state *ios;
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/*TODO: Maybe use kmem_cach per sbi of size
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* exofs_io_state_size(layout->s_numdevs)
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*/
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ios = kzalloc(exofs_io_state_size(layout->s_numdevs), GFP_KERNEL);
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if (unlikely(!ios)) {
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EXOFS_DBGMSG("Faild kzalloc bytes=%d\n",
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exofs_io_state_size(layout->s_numdevs));
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*pios = NULL;
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return -ENOMEM;
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}
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ios->layout = layout;
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ios->obj.partition = layout->s_pid;
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*pios = ios;
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return 0;
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}
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void exofs_put_io_state(struct exofs_io_state *ios)
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{
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if (ios) {
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unsigned i;
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for (i = 0; i < ios->numdevs; i++) {
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struct exofs_per_dev_state *per_dev = &ios->per_dev[i];
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if (per_dev->or)
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osd_end_request(per_dev->or);
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if (per_dev->bio)
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bio_put(per_dev->bio);
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}
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kfree(ios);
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}
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}
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static void _sync_done(struct exofs_io_state *ios, void *p)
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{
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struct completion *waiting = p;
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complete(waiting);
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}
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static void _last_io(struct kref *kref)
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{
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struct exofs_io_state *ios = container_of(
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kref, struct exofs_io_state, kref);
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ios->done(ios, ios->private);
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}
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static void _done_io(struct osd_request *or, void *p)
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{
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struct exofs_io_state *ios = p;
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kref_put(&ios->kref, _last_io);
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}
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static int exofs_io_execute(struct exofs_io_state *ios)
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{
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DECLARE_COMPLETION_ONSTACK(wait);
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bool sync = (ios->done == NULL);
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int i, ret;
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if (sync) {
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ios->done = _sync_done;
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ios->private = &wait;
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}
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for (i = 0; i < ios->numdevs; i++) {
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struct osd_request *or = ios->per_dev[i].or;
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if (unlikely(!or))
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continue;
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ret = osd_finalize_request(or, 0, ios->cred, NULL);
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if (unlikely(ret)) {
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EXOFS_DBGMSG("Faild to osd_finalize_request() => %d\n",
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ret);
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return ret;
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}
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}
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kref_init(&ios->kref);
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for (i = 0; i < ios->numdevs; i++) {
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struct osd_request *or = ios->per_dev[i].or;
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if (unlikely(!or))
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continue;
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kref_get(&ios->kref);
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osd_execute_request_async(or, _done_io, ios);
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}
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kref_put(&ios->kref, _last_io);
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ret = 0;
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if (sync) {
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wait_for_completion(&wait);
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ret = exofs_check_io(ios, NULL);
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}
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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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int acumulated_lin_err = 0;
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int i;
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for (i = 0; i < ios->numdevs; i++) {
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struct osd_sense_info 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 (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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acumulated_osd_err = osi.osd_err_pri;
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acumulated_lin_err = ret;
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}
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}
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/* TODO: raid specific residual calculations */
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if (resid) {
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if (likely(!acumulated_lin_err))
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*resid = 0;
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else
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*resid = ios->length;
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}
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return acumulated_lin_err;
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}
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int exofs_sbi_create(struct exofs_io_state *ios)
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{
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int i, ret;
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for (i = 0; i < ios->layout->s_numdevs; i++) {
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struct osd_request *or;
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or = osd_start_request(ios->layout->s_ods[i], GFP_KERNEL);
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if (unlikely(!or)) {
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EXOFS_ERR("%s: osd_start_request failed\n", __func__);
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ret = -ENOMEM;
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goto out;
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}
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ios->per_dev[i].or = or;
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ios->numdevs++;
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osd_req_create_object(or, &ios->obj);
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}
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ret = exofs_io_execute(ios);
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out:
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return ret;
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}
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int exofs_sbi_remove(struct exofs_io_state *ios)
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{
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int i, ret;
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for (i = 0; i < ios->layout->s_numdevs; i++) {
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struct osd_request *or;
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or = osd_start_request(ios->layout->s_ods[i], GFP_KERNEL);
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if (unlikely(!or)) {
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EXOFS_ERR("%s: osd_start_request failed\n", __func__);
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ret = -ENOMEM;
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goto out;
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}
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ios->per_dev[i].or = or;
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ios->numdevs++;
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osd_req_remove_object(or, &ios->obj);
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}
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ret = exofs_io_execute(ios);
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out:
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return ret;
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}
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int exofs_sbi_write(struct exofs_io_state *ios)
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{
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int i, ret;
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for (i = 0; i < ios->layout->s_numdevs; i++) {
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struct osd_request *or;
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or = osd_start_request(ios->layout->s_ods[i], GFP_KERNEL);
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if (unlikely(!or)) {
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EXOFS_ERR("%s: osd_start_request failed\n", __func__);
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ret = -ENOMEM;
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goto out;
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}
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ios->per_dev[i].or = or;
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ios->numdevs++;
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if (ios->bio) {
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struct bio *bio;
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if (i != 0) {
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bio = bio_kmalloc(GFP_KERNEL,
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ios->bio->bi_max_vecs);
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if (unlikely(!bio)) {
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EXOFS_DBGMSG(
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"Faild to allocate BIO size=%u\n",
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ios->bio->bi_max_vecs);
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ret = -ENOMEM;
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goto out;
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}
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__bio_clone(bio, ios->bio);
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bio->bi_bdev = NULL;
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bio->bi_next = NULL;
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ios->per_dev[i].bio = bio;
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} else {
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bio = ios->bio;
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}
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osd_req_write(or, &ios->obj, ios->offset, bio,
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ios->length);
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EXOFS_DBGMSG("write(0x%llx) offset=0x%llx "
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"length=0x%llx dev=%d\n",
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_LLU(ios->obj.id), _LLU(ios->offset),
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_LLU(ios->length), i);
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} else if (ios->kern_buff) {
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osd_req_write_kern(or, &ios->obj, ios->offset,
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ios->kern_buff, ios->length);
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EXOFS_DBGMSG2("write_kern(0x%llx) offset=0x%llx "
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"length=0x%llx dev=%d\n",
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_LLU(ios->obj.id), _LLU(ios->offset),
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_LLU(ios->length), i);
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} else {
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osd_req_set_attributes(or, &ios->obj);
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EXOFS_DBGMSG2("obj(0x%llx) set_attributes=%d dev=%d\n",
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_LLU(ios->obj.id), ios->out_attr_len, i);
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}
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if (ios->out_attr)
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osd_req_add_set_attr_list(or, ios->out_attr,
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ios->out_attr_len);
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if (ios->in_attr)
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osd_req_add_get_attr_list(or, ios->in_attr,
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ios->in_attr_len);
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}
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ret = exofs_io_execute(ios);
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out:
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return ret;
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}
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int exofs_sbi_read(struct exofs_io_state *ios)
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{
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struct osd_request *or;
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struct exofs_per_dev_state *per_dev = &ios->per_dev[0];
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unsigned first_dev = (unsigned)ios->obj.id;
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first_dev %= ios->layout->s_numdevs;
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or = osd_start_request(ios->layout->s_ods[first_dev], GFP_KERNEL);
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if (unlikely(!or)) {
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EXOFS_ERR("%s: osd_start_request failed\n", __func__);
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return -ENOMEM;
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}
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per_dev->or = or;
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ios->numdevs++;
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if (ios->bio) {
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osd_req_read(or, &ios->obj, ios->offset, ios->bio, ios->length);
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EXOFS_DBGMSG("read(0x%llx) offset=0x%llx length=0x%llx"
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" dev=%d\n", _LLU(ios->obj.id),
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_LLU(ios->offset), _LLU(ios->length),
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first_dev);
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} else if (ios->kern_buff) {
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int ret = osd_req_read_kern(or, &ios->obj, ios->offset,
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ios->kern_buff, ios->length);
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EXOFS_DBGMSG2("read_kern(0x%llx) offset=0x%llx "
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"length=0x%llx dev=%d ret=>%d\n",
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_LLU(ios->obj.id), _LLU(ios->offset),
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_LLU(ios->length), first_dev, ret);
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if (unlikely(ret))
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return ret;
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} else {
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osd_req_get_attributes(or, &ios->obj);
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EXOFS_DBGMSG2("obj(0x%llx) get_attributes=%d dev=%d\n",
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_LLU(ios->obj.id), ios->in_attr_len, first_dev);
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}
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if (ios->out_attr)
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osd_req_add_set_attr_list(or, ios->out_attr, ios->out_attr_len);
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if (ios->in_attr)
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osd_req_add_get_attr_list(or, ios->in_attr, ios->in_attr_len);
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return exofs_io_execute(ios);
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}
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int extract_attr_from_ios(struct exofs_io_state *ios, struct osd_attr *attr)
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{
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struct osd_attr cur_attr = {.attr_page = 0}; /* start with zeros */
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void *iter = NULL;
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int nelem;
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do {
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nelem = 1;
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osd_req_decode_get_attr_list(ios->per_dev[0].or,
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&cur_attr, &nelem, &iter);
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if ((cur_attr.attr_page == attr->attr_page) &&
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(cur_attr.attr_id == attr->attr_id)) {
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attr->len = cur_attr.len;
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attr->val_ptr = cur_attr.val_ptr;
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return 0;
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}
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} while (iter);
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return -EIO;
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}
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int exofs_oi_truncate(struct exofs_i_info *oi, u64 size)
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{
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struct exofs_sb_info *sbi = oi->vfs_inode.i_sb->s_fs_info;
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struct exofs_io_state *ios;
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struct osd_attr attr;
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__be64 newsize;
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int i, ret;
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if (exofs_get_io_state(&sbi->layout, &ios))
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return -ENOMEM;
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ios->obj.id = exofs_oi_objno(oi);
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ios->cred = oi->i_cred;
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newsize = cpu_to_be64(size);
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attr = g_attr_logical_length;
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attr.val_ptr = &newsize;
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for (i = 0; i < sbi->layout.s_numdevs; i++) {
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struct osd_request *or;
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or = osd_start_request(sbi->layout.s_ods[i], GFP_KERNEL);
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if (unlikely(!or)) {
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EXOFS_ERR("%s: osd_start_request failed\n", __func__);
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ret = -ENOMEM;
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goto out;
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}
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ios->per_dev[i].or = or;
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ios->numdevs++;
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osd_req_set_attributes(or, &ios->obj);
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osd_req_add_set_attr_list(or, &attr, 1);
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}
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ret = exofs_io_execute(ios);
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out:
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exofs_put_io_state(ios);
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return ret;
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}
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