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xfs: pass a CIL context to xlog_write()

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Pass the CIL context to xlog_write() rather than a pointer to a LSN
variable. Only the CIL checkpoint calls to xlog_write() need to know
about the start LSN of the writes, so rework xlog_write to directly
write the LSNs into the CIL context structure.

This removes the commit_lsn variable from xlog_cil_push_work(), so
now we only have to issue the commit record ordering wakeup from
there.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
This commit is contained in:
Dave Chinner 2021-08-10 18:00:42 -07:00 committed by Darrick J. Wong
parent 2ce82b722d
commit c45aba40cf
3 changed files with 52 additions and 25 deletions
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18
fs/xfs/xfs_log.c
View File

@ -933,7 +933,7 @@ xlog_write_unmount_record(
/* account for space used by record data */
ticket->t_curr_res -= sizeof(ulf);
return xlog_write(log, &vec, ticket, NULL, NULL, XLOG_UNMOUNT_TRANS);
return xlog_write(log, NULL, &vec, ticket, NULL, XLOG_UNMOUNT_TRANS);
}
/*
@ -2470,9 +2470,9 @@ release_iclog:
int
xlog_write(
struct xlog *log,
struct xfs_cil_ctx *ctx,
struct xfs_log_vec *log_vector,
struct xlog_ticket *ticket,
xfs_lsn_t *start_lsn,
struct xlog_in_core **commit_iclog,
uint optype)
{
@ -2503,8 +2503,6 @@ xlog_write(
}
len = xlog_write_calc_vec_length(ticket, log_vector, optype);
if (start_lsn)
*start_lsn = 0;
while (lv && (!lv->lv_niovecs || index < lv->lv_niovecs)) {
void *ptr;
int log_offset;
@ -2517,9 +2515,15 @@ xlog_write(
ASSERT(log_offset <= iclog->ic_size - 1);
ptr = iclog->ic_datap + log_offset;
/* Start_lsn is the first lsn written to. */
if (start_lsn && !*start_lsn)
*start_lsn = be64_to_cpu(iclog->ic_header.h_lsn);
/*
* If we have a context pointer, pass it the first iclog we are
* writing to so it can record state needed for iclog write
* ordering.
*/
if (ctx) {
xlog_cil_set_ctx_write_state(ctx, iclog);
ctx = NULL;
}
/*
* This loop writes out as many regions as can fit in the amount

46
fs/xfs/xfs_log_cil.c
View File

@ -631,6 +631,30 @@ xlog_cil_process_committed(
}
}
/*
* Record the LSN of the iclog we were just granted space to start writing into.
* If the context doesn't have a start_lsn recorded, then this iclog will
* contain the start record for the checkpoint. Otherwise this write contains
* the commit record for the checkpoint.
*/
void
xlog_cil_set_ctx_write_state(
struct xfs_cil_ctx *ctx,
struct xlog_in_core *iclog)
{
struct xfs_cil *cil = ctx->cil;
xfs_lsn_t lsn = be64_to_cpu(iclog->ic_header.h_lsn);
ASSERT(!ctx->commit_lsn);
spin_lock(&cil->xc_push_lock);
if (!ctx->start_lsn)
ctx->start_lsn = lsn;
else
ctx->commit_lsn = lsn;
spin_unlock(&cil->xc_push_lock);
}
/*
* Write out the commit record of a checkpoint transaction associated with the
* given ticket to close off a running log write. Return the lsn of the commit
@ -638,11 +662,10 @@ xlog_cil_process_committed(
*/
static int
xlog_cil_write_commit_record(
struct xlog *log,
struct xlog_ticket *ticket,
struct xlog_in_core **iclog,
xfs_lsn_t *lsn)
struct xfs_cil_ctx *ctx,
struct xlog_in_core **iclog)
{
struct xlog *log = ctx->cil->xc_log;
struct xfs_log_iovec reg = {
.i_addr = NULL,
.i_len = 0,
@ -657,7 +680,8 @@ xlog_cil_write_commit_record(
if (xlog_is_shutdown(log))
return -EIO;
error = xlog_write(log, &vec, ticket, lsn, iclog, XLOG_COMMIT_TRANS);
error = xlog_write(log, ctx, &vec, ctx->ticket, iclog,
XLOG_COMMIT_TRANS);
if (error)
xfs_force_shutdown(log->l_mp, SHUTDOWN_LOG_IO_ERROR);
return error;
@ -695,7 +719,6 @@ xlog_cil_push_work(
struct xfs_log_iovec lhdr;
struct xfs_log_vec lvhdr = { NULL };
xfs_lsn_t preflush_tail_lsn;
xfs_lsn_t commit_lsn;
xfs_csn_t push_seq;
struct bio bio;
DECLARE_COMPLETION_ONSTACK(bdev_flush);
@ -877,8 +900,7 @@ xlog_cil_push_work(
*/
wait_for_completion(&bdev_flush);
error = xlog_write(log, &lvhdr, tic, &ctx->start_lsn, NULL,
XLOG_START_TRANS);
error = xlog_write(log, ctx, &lvhdr, tic, NULL, XLOG_START_TRANS);
if (error)
goto out_abort_free_ticket;
@ -916,8 +938,7 @@ restart:
}
spin_unlock(&cil->xc_push_lock);
error = xlog_cil_write_commit_record(log, tic, &commit_iclog,
&commit_lsn);
error = xlog_cil_write_commit_record(ctx, &commit_iclog);
if (error)
goto out_abort_free_ticket;
@ -944,7 +965,6 @@ restart:
* and wake up anyone who is waiting for the commit to complete.
*/
spin_lock(&cil->xc_push_lock);
ctx->commit_lsn = commit_lsn;
wake_up_all(&cil->xc_commit_wait);
spin_unlock(&cil->xc_push_lock);
@ -960,11 +980,11 @@ restart:
* iclog header lsn and compare it to the commit lsn to determine if we
* need to wait on iclogs or not.
*/
if (ctx->start_lsn != commit_lsn) {
if (ctx->start_lsn != ctx->commit_lsn) {
xfs_lsn_t plsn;
plsn = be64_to_cpu(commit_iclog->ic_prev->ic_header.h_lsn);
if (plsn && XFS_LSN_CMP(plsn, commit_lsn) < 0) {
if (plsn && XFS_LSN_CMP(plsn, ctx->commit_lsn) < 0) {
/*
* Waiting on ic_force_wait orders the completion of
* iclogs older than ic_prev. Hence we only need to wait

7
fs/xfs/xfs_log_priv.h
View File

@ -512,8 +512,8 @@ xlog_write_adv_cnt(void **ptr, int *len, int *off, size_t bytes)
void xlog_print_tic_res(struct xfs_mount *mp, struct xlog_ticket *ticket);
void xlog_print_trans(struct xfs_trans *);
int xlog_write(struct xlog *log, struct xfs_log_vec *log_vector,
struct xlog_ticket *tic, xfs_lsn_t *start_lsn,
int xlog_write(struct xlog *log, struct xfs_cil_ctx *ctx,
struct xfs_log_vec *log_vector, struct xlog_ticket *tic,
struct xlog_in_core **commit_iclog, uint optype);
void xfs_log_ticket_ungrant(struct xlog *log, struct xlog_ticket *ticket);
void xfs_log_ticket_regrant(struct xlog *log, struct xlog_ticket *ticket);
@ -585,6 +585,9 @@ void xlog_cil_destroy(struct xlog *log);
bool xlog_cil_empty(struct xlog *log);
void xlog_cil_commit(struct xlog *log, struct xfs_trans *tp,
xfs_csn_t *commit_seq, bool regrant);
void xlog_cil_set_ctx_write_state(struct xfs_cil_ctx *ctx,
struct xlog_in_core *iclog);
/*
* CIL force routines