raid5-ppl.c (94568f64af50bb37c418b200449698cfe7e1da5f) raid5-ppl.c (845b9e229fe0716ab6b4d94b4364c99069667b59)
1/*
2 * Partial Parity Log for closing the RAID5 write hole
3 * Copyright (c) 2017, Intel Corporation.
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms and conditions of the GNU General Public License,
7 * version 2, as published by the Free Software Foundation.
8 *

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323}
324
325int ppl_write_stripe(struct r5conf *conf, struct stripe_head *sh)
326{
327 struct ppl_conf *ppl_conf = conf->log_private;
328 struct ppl_io_unit *io = sh->ppl_io;
329 struct ppl_log *log;
330
1/*
2 * Partial Parity Log for closing the RAID5 write hole
3 * Copyright (c) 2017, Intel Corporation.
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms and conditions of the GNU General Public License,
7 * version 2, as published by the Free Software Foundation.
8 *

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323}
324
325int ppl_write_stripe(struct r5conf *conf, struct stripe_head *sh)
326{
327 struct ppl_conf *ppl_conf = conf->log_private;
328 struct ppl_io_unit *io = sh->ppl_io;
329 struct ppl_log *log;
330
331 if (io || test_bit(STRIPE_SYNCING, &sh->state) ||
331 if (io || test_bit(STRIPE_SYNCING, &sh->state) || !sh->ppl_page ||
332 !test_bit(R5_Wantwrite, &sh->dev[sh->pd_idx].flags) ||
333 !test_bit(R5_Insync, &sh->dev[sh->pd_idx].flags)) {
334 clear_bit(STRIPE_LOG_TRAPPED, &sh->state);
335 return -EAGAIN;
336 }
337
338 log = &ppl_conf->child_logs[sh->pd_idx];
339

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1199 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
1200 } else if (mddev->pers && ppl_conf->mismatch_count > 0) {
1201 /* no mismatch allowed when enabling PPL for a running array */
1202 ret = -EINVAL;
1203 goto err;
1204 }
1205
1206 conf->log_private = ppl_conf;
332 !test_bit(R5_Wantwrite, &sh->dev[sh->pd_idx].flags) ||
333 !test_bit(R5_Insync, &sh->dev[sh->pd_idx].flags)) {
334 clear_bit(STRIPE_LOG_TRAPPED, &sh->state);
335 return -EAGAIN;
336 }
337
338 log = &ppl_conf->child_logs[sh->pd_idx];
339

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1199 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
1200 } else if (mddev->pers && ppl_conf->mismatch_count > 0) {
1201 /* no mismatch allowed when enabling PPL for a running array */
1202 ret = -EINVAL;
1203 goto err;
1204 }
1205
1206 conf->log_private = ppl_conf;
1207 set_bit(MD_HAS_PPL, &ppl_conf->mddev->flags);
1207
1208 return 0;
1209err:
1210 __ppl_exit_log(ppl_conf);
1211 return ret;
1212}
1213
1214int ppl_modify_log(struct r5conf *conf, struct md_rdev *rdev, bool add)

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1209 return 0;
1210err:
1211 __ppl_exit_log(ppl_conf);
1212 return ret;
1213}
1214
1215int ppl_modify_log(struct r5conf *conf, struct md_rdev *rdev, bool add)

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