log.c (5a4e9c607e03886815121fa975fcd8e0fa7252fe) log.c (6188e8777de48c8404b0bcca74a70ac83c37d773)
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
4 * Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved.
5 */
6
7#include <linux/sched.h>
8#include <linux/slab.h>

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45 * Returns: the number of blocks needed (minimum is always 1)
46 */
47
48unsigned int gfs2_struct2blk(struct gfs2_sbd *sdp, unsigned int nstruct)
49{
50 unsigned int blks;
51 unsigned int first, second;
52
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
4 * Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved.
5 */
6
7#include <linux/sched.h>
8#include <linux/slab.h>

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45 * Returns: the number of blocks needed (minimum is always 1)
46 */
47
48unsigned int gfs2_struct2blk(struct gfs2_sbd *sdp, unsigned int nstruct)
49{
50 unsigned int blks;
51 unsigned int first, second;
52
53 /* The initial struct gfs2_log_descriptor block */
53 blks = 1;
54 first = sdp->sd_ldptrs;
55
56 if (nstruct > first) {
54 blks = 1;
55 first = sdp->sd_ldptrs;
56
57 if (nstruct > first) {
58 /* Subsequent struct gfs2_meta_header blocks */
57 second = sdp->sd_inptrs;
58 blks += DIV_ROUND_UP(nstruct - first, second);
59 }
60
61 return blks;
62}
63
64/**

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502 dist = newer - older;
503 if (dist < 0)
504 dist += sdp->sd_jdesc->jd_blocks;
505
506 return dist;
507}
508
509/**
59 second = sdp->sd_inptrs;
60 blks += DIV_ROUND_UP(nstruct - first, second);
61 }
62
63 return blks;
64}
65
66/**

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504 dist = newer - older;
505 if (dist < 0)
506 dist += sdp->sd_jdesc->jd_blocks;
507
508 return dist;
509}
510
511/**
510 * calc_reserved - Calculate the number of blocks to reserve when
511 * refunding a transaction's unused buffers.
512 * calc_reserved - Calculate the number of blocks to keep reserved
512 * @sdp: The GFS2 superblock
513 *
514 * This is complex. We need to reserve room for all our currently used
513 * @sdp: The GFS2 superblock
514 *
515 * This is complex. We need to reserve room for all our currently used
515 * metadata buffers (e.g. normal file I/O rewriting file time stamps) and
516 * all our journaled data buffers for journaled files (e.g. files in the
516 * metadata blocks (e.g. normal file I/O rewriting file time stamps) and
517 * all our journaled data blocks for journaled files (e.g. files in the
517 * meta_fs like rindex, or files for which chattr +j was done.)
518 * meta_fs like rindex, or files for which chattr +j was done.)
518 * If we don't reserve enough space, gfs2_log_refund and gfs2_log_flush
519 * will count it as free space (sd_log_blks_free) and corruption will follow.
519 * If we don't reserve enough space, corruption will follow.
520 *
520 *
521 * We can have metadata bufs and jdata bufs in the same journal. So each
522 * type gets its own log header, for which we need to reserve a block.
523 * In fact, each type has the potential for needing more than one header
524 * in cases where we have more buffers than will fit on a journal page.
521 * We can have metadata blocks and jdata blocks in the same journal. Each
522 * type gets its own log descriptor, for which we need to reserve a block.
523 * In fact, each type has the potential for needing more than one log descriptor
524 * in cases where we have more blocks than will fit in a log descriptor.
525 * Metadata journal entries take up half the space of journaled buffer entries.
525 * Metadata journal entries take up half the space of journaled buffer entries.
526 * Thus, metadata entries have buf_limit (502) and journaled buffers have
527 * databuf_limit (251) before they cause a wrap around.
528 *
529 * Also, we need to reserve blocks for revoke journal entries and one for an
530 * overall header for the lot.
531 *
532 * Returns: the number of blocks reserved
533 */
534static unsigned int calc_reserved(struct gfs2_sbd *sdp)
535{

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1003 goto out_withdraw;
1004 gfs2_log_submit_bio(&sdp->sd_log_bio, REQ_OP_WRITE);
1005 if (gfs2_withdrawn(sdp))
1006 goto out_withdraw;
1007
1008 if (sdp->sd_log_head != sdp->sd_log_flush_head) {
1009 log_flush_wait(sdp);
1010 log_write_header(sdp, flags);
526 *
527 * Also, we need to reserve blocks for revoke journal entries and one for an
528 * overall header for the lot.
529 *
530 * Returns: the number of blocks reserved
531 */
532static unsigned int calc_reserved(struct gfs2_sbd *sdp)
533{

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1001 goto out_withdraw;
1002 gfs2_log_submit_bio(&sdp->sd_log_bio, REQ_OP_WRITE);
1003 if (gfs2_withdrawn(sdp))
1004 goto out_withdraw;
1005
1006 if (sdp->sd_log_head != sdp->sd_log_flush_head) {
1007 log_flush_wait(sdp);
1008 log_write_header(sdp, flags);
1011 } else if (sdp->sd_log_tail != current_tail(sdp) && !sdp->sd_log_idle){
1009 } else if (sdp->sd_log_tail != current_tail(sdp) && !sdp->sd_log_idle) {
1012 atomic_dec(&sdp->sd_log_blks_free); /* Adjust for unreserved buffer */
1013 trace_gfs2_log_blocks(sdp, -1);
1014 log_write_header(sdp, flags);
1015 }
1016 if (gfs2_withdrawn(sdp))
1017 goto out_withdraw;
1018 lops_after_commit(sdp, tr);
1019

--- 252 unchanged lines hidden --- 		1010 atomic_dec(&sdp->sd_log_blks_free); /* Adjust for unreserved buffer */
1011 trace_gfs2_log_blocks(sdp, -1);
1012 log_write_header(sdp, flags);
1013 }
1014 if (gfs2_withdrawn(sdp))
1015 goto out_withdraw;
1016 lops_after_commit(sdp, tr);
1017

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