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gfs2: Remove active journal side effect from gfs2_write_log_header

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Function gfs2_write_log_header can be used to write a log header into any of
the journals of a filesystem.  When used on the node's own journal,
gfs2_write_log_header advances the current position in the log
(sdp->sd_log_flush_head) as a side effect, through function gfs2_log_bmap.

This is confusing, and it also means that we can't use gfs2_log_bmap for other
journals even if they have an extent map.  So clean this mess up by not
advancing sdp->sd_log_flush_head in gfs2_write_log_header or gfs2_log_bmap
anymore and making that a responsibility of the callers instead.

This is related to commit 7c70b89695 ("gfs2: clean_journal improperly set
sd_log_flush_head").

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
This commit is contained in:
Andreas Gruenbacher 2019-08-28 22:21:34 +02:00
parent 184b4e6085
commit 19ebc050e4
4 changed files with 23 additions and 18 deletions
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3
fs/gfs2/log.c
View File

@ -707,7 +707,7 @@ void gfs2_write_log_header(struct gfs2_sbd *sdp, struct gfs2_jdesc *jd,
lh->lh_nsec = cpu_to_be32(tv.tv_nsec);
lh->lh_sec = cpu_to_be64(tv.tv_sec);
if (!list_empty(&jd->extent_list))
dblock = gfs2_log_bmap(sdp);
dblock = gfs2_log_bmap(jd, lblock);
else {
int ret = gfs2_lblk_to_dblk(jd->jd_inode, lblock, &dblock);
if (gfs2_assert_withdraw(sdp, ret == 0))
@ -768,6 +768,7 @@ static void log_write_header(struct gfs2_sbd *sdp, u32 flags)
sdp->sd_log_idle = (tail == sdp->sd_log_flush_head);
gfs2_write_log_header(sdp, sdp->sd_jdesc, sdp->sd_log_sequence++, tail,
sdp->sd_log_flush_head, flags, op_flags);
gfs2_log_incr_head(sdp);
if (sdp->sd_log_tail != tail)
log_pull_tail(sdp, tail);

29
fs/gfs2/lops.c
View File

@ -129,7 +129,7 @@ static void gfs2_unpin(struct gfs2_sbd *sdp, struct buffer_head *bh,
atomic_dec(&sdp->sd_log_pinned);
}
static void gfs2_log_incr_head(struct gfs2_sbd *sdp)
void gfs2_log_incr_head(struct gfs2_sbd *sdp)
{
BUG_ON((sdp->sd_log_flush_head == sdp->sd_log_tail) &&
(sdp->sd_log_flush_head != sdp->sd_log_head));
@ -138,18 +138,13 @@ static void gfs2_log_incr_head(struct gfs2_sbd *sdp)
sdp->sd_log_flush_head = 0;
}
u64 gfs2_log_bmap(struct gfs2_sbd *sdp)
u64 gfs2_log_bmap(struct gfs2_jdesc *jd, unsigned int lblock)
{
unsigned int lbn = sdp->sd_log_flush_head;
struct gfs2_journal_extent *je;
u64 block;
list_for_each_entry(je, &sdp->sd_jdesc->extent_list, list) {
if ((lbn >= je->lblock) && (lbn < (je->lblock + je->blocks))) {
block = je->dblock + lbn - je->lblock;
gfs2_log_incr_head(sdp);
return block;
}
list_for_each_entry(je, &jd->extent_list, list) {
if (lblock >= je->lblock && lblock < je->lblock + je->blocks)
return je->dblock + lblock - je->lblock;
}
return -1;
@ -351,8 +346,11 @@ void gfs2_log_write(struct gfs2_sbd *sdp, struct page *page,
static void gfs2_log_write_bh(struct gfs2_sbd *sdp, struct buffer_head *bh)
{
gfs2_log_write(sdp, bh->b_page, bh->b_size, bh_offset(bh),
gfs2_log_bmap(sdp));
u64 dblock;
dblock = gfs2_log_bmap(sdp->sd_jdesc, sdp->sd_log_flush_head);
gfs2_log_incr_head(sdp);
gfs2_log_write(sdp, bh->b_page, bh->b_size, bh_offset(bh), dblock);
}
/**
@ -369,8 +367,11 @@ static void gfs2_log_write_bh(struct gfs2_sbd *sdp, struct buffer_head *bh)
void gfs2_log_write_page(struct gfs2_sbd *sdp, struct page *page)
{
struct super_block *sb = sdp->sd_vfs;
gfs2_log_write(sdp, page, sb->s_blocksize, 0,
gfs2_log_bmap(sdp));
u64 dblock;
dblock = gfs2_log_bmap(sdp->sd_jdesc, sdp->sd_log_flush_head);
gfs2_log_incr_head(sdp);
gfs2_log_write(sdp, page, sb->s_blocksize, 0, dblock);
}
/**

3
fs/gfs2/lops.h
View File

@ -18,7 +18,8 @@
~(2 * sizeof(__be64) - 1))
extern const struct gfs2_log_operations *gfs2_log_ops[];
extern u64 gfs2_log_bmap(struct gfs2_sbd *sdp);
extern void gfs2_log_incr_head(struct gfs2_sbd *sdp);
extern u64 gfs2_log_bmap(struct gfs2_jdesc *jd, unsigned int lbn);
extern void gfs2_log_write(struct gfs2_sbd *sdp, struct page *page,
unsigned size, unsigned offset, u64 blkno);
extern void gfs2_log_write_page(struct gfs2_sbd *sdp, struct page *page);

6
fs/gfs2/recovery.c
View File

@ -263,11 +263,13 @@ static void clean_journal(struct gfs2_jdesc *jd,
u32 lblock = head->lh_blkno;
gfs2_replay_incr_blk(jd, &lblock);
if (jd->jd_jid == sdp->sd_lockstruct.ls_jid)
sdp->sd_log_flush_head = lblock;
gfs2_write_log_header(sdp, jd, head->lh_sequence + 1, 0, lblock,
GFS2_LOG_HEAD_UNMOUNT | GFS2_LOG_HEAD_RECOVERY,
REQ_PREFLUSH | REQ_FUA | REQ_META | REQ_SYNC);
if (jd->jd_jid == sdp->sd_lockstruct.ls_jid) {
sdp->sd_log_flush_head = lblock;
gfs2_log_incr_head(sdp);
}
}