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authorDave Chinner <dchinner@redhat.com>2021-08-11 04:00:43 +0300
committerDarrick J. Wong <djwong@kernel.org>2021-08-16 22:09:29 +0300
commitbf034bc827807ac15affa051e6a94b03f93b1a03 (patch)
treee9e9cbd3d80afcb4e0cf72177886c193bbb8d764 /fs/xfs/xfs_log_cil.c
parentc45aba40cf5b2988c0bebee8c9b846c88aa651eb (diff)
downloadlinux-bf034bc827807ac15affa051e6a94b03f93b1a03.tar.xz
xfs: factor out log write ordering from xlog_cil_push_work()
So we can use it for start record ordering as well as commit record ordering in future. Signed-off-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Darrick J. Wong <djwong@kernel.org> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Diffstat (limited to 'fs/xfs/xfs_log_cil.c')
-rw-r--r--fs/xfs/xfs_log_cil.c87
1 files changed, 51 insertions, 36 deletions
diff --git a/fs/xfs/xfs_log_cil.c b/fs/xfs/xfs_log_cil.c
index 651118fbaa61..38917c97a582 100644
--- a/fs/xfs/xfs_log_cil.c
+++ b/fs/xfs/xfs_log_cil.c
@@ -656,9 +656,54 @@ xlog_cil_set_ctx_write_state(
/*
- * 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
- * record.
+ * Ensure that the order of log writes follows checkpoint sequence order. This
+ * relies on the context LSN being zero until the log write has guaranteed the
+ * LSN that the log write will start at via xlog_state_get_iclog_space().
+ */
+static int
+xlog_cil_order_write(
+ struct xfs_cil *cil,
+ xfs_csn_t sequence)
+{
+ struct xfs_cil_ctx *ctx;
+
+restart:
+ spin_lock(&cil->xc_push_lock);
+ list_for_each_entry(ctx, &cil->xc_committing, committing) {
+ /*
+ * Avoid getting stuck in this loop because we were woken by the
+ * shutdown, but then went back to sleep once already in the
+ * shutdown state.
+ */
+ if (xlog_is_shutdown(cil->xc_log)) {
+ spin_unlock(&cil->xc_push_lock);
+ return -EIO;
+ }
+
+ /*
+ * Higher sequences will wait for this one so skip them.
+ * Don't wait for our own sequence, either.
+ */
+ if (ctx->sequence >= sequence)
+ continue;
+ if (!ctx->commit_lsn) {
+ /*
+ * It is still being pushed! Wait for the push to
+ * complete, then start again from the beginning.
+ */
+ xlog_wait(&cil->xc_commit_wait, &cil->xc_push_lock);
+ goto restart;
+ }
+ }
+ spin_unlock(&cil->xc_push_lock);
+ return 0;
+}
+
+/*
+ * Write out the commit record of a checkpoint transaction to close off a
+ * running log write. These commit records are strictly ordered in ascending CIL
+ * sequence order so that log recovery will always replay the checkpoints in the
+ * correct order.
*/
static int
xlog_cil_write_commit_record(
@@ -904,39 +949,9 @@ xlog_cil_push_work(
if (error)
goto out_abort_free_ticket;
- /*
- * now that we've written the checkpoint into the log, strictly
- * order the commit records so replay will get them in the right order.
- */
-restart:
- spin_lock(&cil->xc_push_lock);
- list_for_each_entry(new_ctx, &cil->xc_committing, committing) {
- /*
- * Avoid getting stuck in this loop because we were woken by the
- * shutdown, but then went back to sleep once already in the
- * shutdown state.
- */
- if (xlog_is_shutdown(log)) {
- spin_unlock(&cil->xc_push_lock);
- goto out_abort_free_ticket;
- }
-
- /*
- * Higher sequences will wait for this one so skip them.
- * Don't wait for our own sequence, either.
- */
- if (new_ctx->sequence >= ctx->sequence)
- continue;
- if (!new_ctx->commit_lsn) {
- /*
- * It is still being pushed! Wait for the push to
- * complete, then start again from the beginning.
- */
- xlog_wait(&cil->xc_commit_wait, &cil->xc_push_lock);
- goto restart;
- }
- }
- spin_unlock(&cil->xc_push_lock);
+ error = xlog_cil_order_write(ctx->cil, ctx->sequence);
+ if (error)
+ goto out_abort_free_ticket;
error = xlog_cil_write_commit_record(ctx, &commit_iclog);
if (error)