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GFS2: Made logd daemon take into account log demand

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Before this patch, the logd daemon only tried to flush things when
the log blocks pinned exceeded a certain threshold. But when we're
deleting very large files, it may require a huge number of journal
blocks, and that, in turn, may exceed the threshold. This patch
factors that into account.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
This commit is contained in:
Bob Peterson 2017-01-05 16:01:45 -05:00
parent 2fcf5cc3be
commit f07b352021
3 changed files with 9 additions and 2 deletions
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1
fs/gfs2/incore.h
View File

@ -794,6 +794,7 @@ struct gfs2_sbd {
atomic_t sd_log_thresh1;
atomic_t sd_log_thresh2;
atomic_t sd_log_blks_free;
atomic_t sd_log_blks_needed;
wait_queue_head_t sd_log_waitq;
wait_queue_head_t sd_logd_waitq;

9
fs/gfs2/log.c
View File

@ -349,6 +349,7 @@ int gfs2_log_reserve(struct gfs2_sbd *sdp, unsigned int blks)
if (gfs2_assert_warn(sdp, blks) ||
gfs2_assert_warn(sdp, blks <= sdp->sd_jdesc->jd_blocks))
return -EINVAL;
atomic_add(blks, &sdp->sd_log_blks_needed);
retry:
free_blocks = atomic_read(&sdp->sd_log_blks_free);
if (unlikely(free_blocks <= wanted)) {
@ -370,6 +371,7 @@ retry:
wake_up(&sdp->sd_reserving_log_wait);
goto retry;
}
atomic_sub(blks, &sdp->sd_log_blks_needed);
trace_gfs2_log_blocks(sdp, -blks);
/*
@ -891,13 +893,16 @@ void gfs2_log_shutdown(struct gfs2_sbd *sdp)
static inline int gfs2_jrnl_flush_reqd(struct gfs2_sbd *sdp)
{
return (atomic_read(&sdp->sd_log_pinned) >= atomic_read(&sdp->sd_log_thresh1));
return (atomic_read(&sdp->sd_log_pinned) +
atomic_read(&sdp->sd_log_blks_needed) >=
atomic_read(&sdp->sd_log_thresh1));
}
static inline int gfs2_ail_flush_reqd(struct gfs2_sbd *sdp)
{
unsigned int used_blocks = sdp->sd_jdesc->jd_blocks - atomic_read(&sdp->sd_log_blks_free);
return used_blocks >= atomic_read(&sdp->sd_log_thresh2);
return used_blocks + atomic_read(&sdp->sd_log_blks_needed) >=
atomic_read(&sdp->sd_log_thresh2);
}
/**

1
fs/gfs2/ops_fstype.c
View File

@ -683,6 +683,7 @@ static int init_journal(struct gfs2_sbd *sdp, int undo)
goto fail_jindex;
}
atomic_set(&sdp->sd_log_blks_needed, 0);
if (sdp->sd_args.ar_spectator) {
sdp->sd_jdesc = gfs2_jdesc_find(sdp, 0);
atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);