695 lines
17 KiB
C
695 lines
17 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 <asm/div64.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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unsigned exofs_layout_od_id(struct exofs_layout *layout,
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osd_id obj_no, unsigned layout_index)
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{
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/* switch (layout->lay_func) {
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case LAYOUT_MOVING_WINDOW:
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{*/
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unsigned dev_mod = obj_no;
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return (layout_index + dev_mod * layout->mirrors_p1) %
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layout->s_numdevs;
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/* }
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case LAYOUT_FUNC_IMPLICT:
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return layout->devs[layout_index];
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}*/
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}
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static inline struct osd_dev *exofs_ios_od(struct exofs_io_state *ios,
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unsigned layout_index)
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{
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return ios->layout->s_ods[
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exofs_layout_od_id(ios->layout, ios->obj.id, layout_index)];
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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->per_dev[i].offset),
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_LLU(ios->per_dev[i].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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/* REMOVEME: After review
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Some quoteing from the standard
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L = logical offset into the file
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W = number of data components in a stripe
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S = W * stripe_unit (S is Stripe length)
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N = L / S (N is the stripe Number)
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C = (L-(N*S)) / stripe_unit (C is the component)
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O = (N*stripe_unit)+(L%stripe_unit) (O is the object's offset)
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*/
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static void _offset_dev_unit_off(struct exofs_io_state *ios, u64 file_offset,
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u64 *obj_offset, unsigned *dev, unsigned *unit_off)
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{
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unsigned stripe_unit = ios->layout->stripe_unit;
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unsigned stripe_length = stripe_unit * ios->layout->group_width;
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u64 stripe_no = file_offset;
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unsigned stripe_mod = do_div(stripe_no, stripe_length);
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*unit_off = stripe_mod % stripe_unit;
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*obj_offset = stripe_no * stripe_unit + *unit_off;
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*dev = stripe_mod / stripe_unit * ios->layout->mirrors_p1;
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}
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static int _add_stripe_unit(struct exofs_io_state *ios, unsigned *cur_bvec,
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struct exofs_per_dev_state *per_dev, int cur_len)
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{
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unsigned bv = *cur_bvec;
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struct request_queue *q =
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osd_request_queue(exofs_ios_od(ios, per_dev->dev));
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per_dev->length += cur_len;
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if (per_dev->bio == NULL) {
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unsigned pages_in_stripe = ios->layout->group_width *
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(ios->layout->stripe_unit / PAGE_SIZE);
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unsigned bio_size = (ios->bio->bi_vcnt + pages_in_stripe) /
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ios->layout->group_width;
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per_dev->bio = bio_kmalloc(GFP_KERNEL, bio_size);
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if (unlikely(!per_dev->bio)) {
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EXOFS_DBGMSG("Faild to allocate BIO size=%u\n",
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bio_size);
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return -ENOMEM;
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}
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}
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while (cur_len > 0) {
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int added_len;
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struct bio_vec *bvec = &ios->bio->bi_io_vec[bv];
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BUG_ON(ios->bio->bi_vcnt <= bv);
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cur_len -= bvec->bv_len;
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added_len = bio_add_pc_page(q, per_dev->bio, bvec->bv_page,
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bvec->bv_len, bvec->bv_offset);
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if (unlikely(bvec->bv_len != added_len))
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return -ENOMEM;
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++bv;
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}
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BUG_ON(cur_len);
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*cur_bvec = bv;
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return 0;
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}
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static int _prepare_for_striping(struct exofs_io_state *ios)
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{
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u64 length = ios->length;
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u64 offset = ios->offset;
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unsigned stripe_unit = ios->layout->stripe_unit;
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unsigned comp = 0;
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unsigned stripes = 0;
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unsigned cur_bvec = 0;
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int ret;
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if (!ios->bio) {
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if (ios->kern_buff) {
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struct exofs_per_dev_state *per_dev = &ios->per_dev[0];
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unsigned unit_off;
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_offset_dev_unit_off(ios, offset, &per_dev->offset,
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&per_dev->dev, &unit_off);
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/* no cross device without page array */
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BUG_ON((ios->layout->group_width > 1) &&
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(unit_off + length > stripe_unit));
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}
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ios->numdevs = ios->layout->mirrors_p1;
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return 0;
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}
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while (length) {
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struct exofs_per_dev_state *per_dev = &ios->per_dev[comp];
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unsigned cur_len;
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if (!per_dev->length) {
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unsigned unit_off;
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_offset_dev_unit_off(ios, offset, &per_dev->offset,
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&per_dev->dev, &unit_off);
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stripes++;
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cur_len = min_t(u64, stripe_unit - unit_off, length);
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offset += cur_len;
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} else {
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cur_len = min_t(u64, stripe_unit, length);
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}
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ret = _add_stripe_unit(ios, &cur_bvec, per_dev, cur_len);
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if (unlikely(ret))
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goto out;
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comp += ios->layout->mirrors_p1;
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comp %= ios->layout->s_numdevs;
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length -= cur_len;
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}
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out:
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ios->numdevs = stripes * ios->layout->mirrors_p1;
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return ret;
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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(exofs_ios_od(ios, 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(exofs_ios_od(ios, 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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static int _sbi_write_mirror(struct exofs_io_state *ios, int cur_comp)
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{
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struct exofs_per_dev_state *master_dev = &ios->per_dev[cur_comp];
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unsigned dev = ios->per_dev[cur_comp].dev;
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unsigned last_comp = cur_comp + ios->layout->mirrors_p1;
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int ret = 0;
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for (; cur_comp < last_comp; ++cur_comp, ++dev) {
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struct exofs_per_dev_state *per_dev = &ios->per_dev[cur_comp];
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struct osd_request *or;
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or = osd_start_request(exofs_ios_od(ios, 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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ret = -ENOMEM;
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goto out;
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}
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per_dev->or = or;
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per_dev->offset = master_dev->offset;
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if (ios->bio) {
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struct bio *bio;
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if (per_dev != master_dev) {
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bio = bio_kmalloc(GFP_KERNEL,
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master_dev->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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master_dev->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, master_dev->bio);
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bio->bi_bdev = NULL;
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bio->bi_next = NULL;
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per_dev->length = master_dev->length;
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per_dev->bio = bio;
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per_dev->dev = dev;
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} else {
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bio = master_dev->bio;
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/* FIXME: bio_set_dir() */
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bio->bi_rw |= (1 << BIO_RW);
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}
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osd_req_write(or, &ios->obj, per_dev->offset, bio,
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per_dev->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(per_dev->offset),
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_LLU(per_dev->length), dev);
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} else if (ios->kern_buff) {
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ret = osd_req_write_kern(or, &ios->obj, per_dev->offset,
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ios->kern_buff, ios->length);
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if (unlikely(ret))
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goto out;
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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(per_dev->offset),
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_LLU(ios->length), dev);
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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, 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,
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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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out:
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return ret;
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}
|
|
|
|
int exofs_sbi_write(struct exofs_io_state *ios)
|
|
{
|
|
int i;
|
|
int ret;
|
|
|
|
ret = _prepare_for_striping(ios);
|
|
if (unlikely(ret))
|
|
return ret;
|
|
|
|
for (i = 0; i < ios->numdevs; i += ios->layout->mirrors_p1) {
|
|
ret = _sbi_write_mirror(ios, i);
|
|
if (unlikely(ret))
|
|
return ret;
|
|
}
|
|
|
|
ret = exofs_io_execute(ios);
|
|
return ret;
|
|
}
|
|
|
|
static int _sbi_read_mirror(struct exofs_io_state *ios, unsigned cur_comp)
|
|
{
|
|
struct osd_request *or;
|
|
struct exofs_per_dev_state *per_dev = &ios->per_dev[cur_comp];
|
|
unsigned first_dev = (unsigned)ios->obj.id;
|
|
|
|
first_dev = per_dev->dev + first_dev % ios->layout->mirrors_p1;
|
|
or = osd_start_request(exofs_ios_od(ios, first_dev), GFP_KERNEL);
|
|
if (unlikely(!or)) {
|
|
EXOFS_ERR("%s: osd_start_request failed\n", __func__);
|
|
return -ENOMEM;
|
|
}
|
|
per_dev->or = or;
|
|
|
|
if (ios->bio) {
|
|
osd_req_read(or, &ios->obj, per_dev->offset,
|
|
per_dev->bio, per_dev->length);
|
|
EXOFS_DBGMSG("read(0x%llx) offset=0x%llx length=0x%llx"
|
|
" dev=%d\n", _LLU(ios->obj.id),
|
|
_LLU(per_dev->offset), _LLU(per_dev->length),
|
|
first_dev);
|
|
} else if (ios->kern_buff) {
|
|
int ret = osd_req_read_kern(or, &ios->obj, per_dev->offset,
|
|
ios->kern_buff, ios->length);
|
|
EXOFS_DBGMSG2("read_kern(0x%llx) offset=0x%llx "
|
|
"length=0x%llx dev=%d ret=>%d\n",
|
|
_LLU(ios->obj.id), _LLU(per_dev->offset),
|
|
_LLU(ios->length), first_dev, ret);
|
|
if (unlikely(ret))
|
|
return ret;
|
|
} else {
|
|
osd_req_get_attributes(or, &ios->obj);
|
|
EXOFS_DBGMSG2("obj(0x%llx) get_attributes=%d dev=%d\n",
|
|
_LLU(ios->obj.id), ios->in_attr_len, first_dev);
|
|
}
|
|
if (ios->out_attr)
|
|
osd_req_add_set_attr_list(or, ios->out_attr, ios->out_attr_len);
|
|
|
|
if (ios->in_attr)
|
|
osd_req_add_get_attr_list(or, ios->in_attr, ios->in_attr_len);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int exofs_sbi_read(struct exofs_io_state *ios)
|
|
{
|
|
int i;
|
|
int ret;
|
|
|
|
ret = _prepare_for_striping(ios);
|
|
if (unlikely(ret))
|
|
return ret;
|
|
|
|
for (i = 0; i < ios->numdevs; i += ios->layout->mirrors_p1) {
|
|
ret = _sbi_read_mirror(ios, i);
|
|
if (unlikely(ret))
|
|
return ret;
|
|
}
|
|
|
|
ret = exofs_io_execute(ios);
|
|
return ret;
|
|
}
|
|
|
|
int extract_attr_from_ios(struct exofs_io_state *ios, struct osd_attr *attr)
|
|
{
|
|
struct osd_attr cur_attr = {.attr_page = 0}; /* start with zeros */
|
|
void *iter = NULL;
|
|
int nelem;
|
|
|
|
do {
|
|
nelem = 1;
|
|
osd_req_decode_get_attr_list(ios->per_dev[0].or,
|
|
&cur_attr, &nelem, &iter);
|
|
if ((cur_attr.attr_page == attr->attr_page) &&
|
|
(cur_attr.attr_id == attr->attr_id)) {
|
|
attr->len = cur_attr.len;
|
|
attr->val_ptr = cur_attr.val_ptr;
|
|
return 0;
|
|
}
|
|
} while (iter);
|
|
|
|
return -EIO;
|
|
}
|
|
|
|
static int _truncate_mirrors(struct exofs_io_state *ios, unsigned cur_comp,
|
|
struct osd_attr *attr)
|
|
{
|
|
int last_comp = cur_comp + ios->layout->mirrors_p1;
|
|
|
|
for (; cur_comp < last_comp; ++cur_comp) {
|
|
struct exofs_per_dev_state *per_dev = &ios->per_dev[cur_comp];
|
|
struct osd_request *or;
|
|
|
|
or = osd_start_request(exofs_ios_od(ios, cur_comp), GFP_KERNEL);
|
|
if (unlikely(!or)) {
|
|
EXOFS_ERR("%s: osd_start_request failed\n", __func__);
|
|
return -ENOMEM;
|
|
}
|
|
per_dev->or = or;
|
|
|
|
osd_req_set_attributes(or, &ios->obj);
|
|
osd_req_add_set_attr_list(or, attr, 1);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int exofs_oi_truncate(struct exofs_i_info *oi, u64 size)
|
|
{
|
|
struct exofs_sb_info *sbi = oi->vfs_inode.i_sb->s_fs_info;
|
|
struct exofs_io_state *ios;
|
|
struct exofs_trunc_attr {
|
|
struct osd_attr attr;
|
|
__be64 newsize;
|
|
} *size_attrs;
|
|
u64 this_obj_size;
|
|
unsigned dev;
|
|
unsigned unit_off;
|
|
int i, ret;
|
|
|
|
ret = exofs_get_io_state(&sbi->layout, &ios);
|
|
if (unlikely(ret))
|
|
return ret;
|
|
|
|
size_attrs = kcalloc(ios->layout->group_width, sizeof(*size_attrs),
|
|
GFP_KERNEL);
|
|
if (unlikely(!size_attrs)) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
ios->obj.id = exofs_oi_objno(oi);
|
|
ios->cred = oi->i_cred;
|
|
|
|
ios->numdevs = ios->layout->s_numdevs;
|
|
_offset_dev_unit_off(ios, size, &this_obj_size, &dev, &unit_off);
|
|
|
|
for (i = 0; i < ios->layout->group_width; ++i) {
|
|
struct exofs_trunc_attr *size_attr = &size_attrs[i];
|
|
u64 obj_size;
|
|
|
|
if (i < dev)
|
|
obj_size = this_obj_size +
|
|
ios->layout->stripe_unit - unit_off;
|
|
else if (i == dev)
|
|
obj_size = this_obj_size;
|
|
else /* i > dev */
|
|
obj_size = this_obj_size - unit_off;
|
|
|
|
size_attr->newsize = cpu_to_be64(obj_size);
|
|
size_attr->attr = g_attr_logical_length;
|
|
size_attr->attr.val_ptr = &size_attr->newsize;
|
|
|
|
ret = _truncate_mirrors(ios, i * ios->layout->mirrors_p1,
|
|
&size_attr->attr);
|
|
if (unlikely(ret))
|
|
goto out;
|
|
}
|
|
ret = exofs_io_execute(ios);
|
|
|
|
out:
|
|
kfree(size_attrs);
|
|
exofs_put_io_state(ios);
|
|
return ret;
|
|
}
|