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Message-Id: <20230825135431.1317785-29-hao.xu@linux.dev>
Date: Fri, 25 Aug 2023 21:54:30 +0800
From: Hao Xu <hao.xu@...ux.dev>
To: io-uring@...r.kernel.org, Jens Axboe <axboe@...nel.dk>
Cc: Dominique Martinet <asmadeus@...ewreck.org>,
Pavel Begunkov <asml.silence@...il.com>,
Christian Brauner <brauner@...nel.org>,
Alexander Viro <viro@...iv.linux.org.uk>,
Stefan Roesch <shr@...com>, Clay Harris <bugs@...ycon.org>,
Dave Chinner <david@...morbit.com>,
"Darrick J . Wong" <djwong@...nel.org>,
linux-fsdevel@...r.kernel.org, linux-xfs@...r.kernel.org,
linux-ext4@...r.kernel.org, linux-cachefs@...hat.com,
ecryptfs@...r.kernel.org, linux-nfs@...r.kernel.org,
linux-unionfs@...r.kernel.org, bpf@...r.kernel.org,
netdev@...r.kernel.org, linux-s390@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-block@...r.kernel.org,
linux-btrfs@...r.kernel.org, codalist@...a.cs.cmu.edu,
linux-f2fs-devel@...ts.sourceforge.net, cluster-devel@...hat.com,
linux-mm@...ck.org, linux-nilfs@...r.kernel.org,
devel@...ts.orangefs.org, linux-cifs@...r.kernel.org,
samba-technical@...ts.samba.org, linux-mtd@...ts.infradead.org,
Wanpeng Li <wanpengli@...cent.com>
Subject: [PATCH 28/29] xfs: support nowait semantics for xc_ctx_lock in xlog_cil_commit()
From: Hao Xu <howeyxu@...cent.com>
Apply trylock logic for xc_ctx_lock in xlog_cil_commit() in nowait
case and error out -EAGAIN for xlog_cil_commit().
Signed-off-by: Hao Xu <howeyxu@...cent.com>
---
fs/xfs/xfs_log_cil.c | 12 ++++++++++--
fs/xfs/xfs_log_priv.h | 2 +-
fs/xfs/xfs_trans.c | 4 +++-
3 files changed, 14 insertions(+), 4 deletions(-)
diff --git a/fs/xfs/xfs_log_cil.c b/fs/xfs/xfs_log_cil.c
index b31830ee36dd..6d054359bbb5 100644
--- a/fs/xfs/xfs_log_cil.c
+++ b/fs/xfs/xfs_log_cil.c
@@ -1613,7 +1613,7 @@ xlog_cil_process_intents(
* background commit, returns without it held once background commits are
* allowed again.
*/
-void
+int
xlog_cil_commit(
struct xlog *log,
struct xfs_trans *tp,
@@ -1623,6 +1623,7 @@ xlog_cil_commit(
struct xfs_cil *cil = log->l_cilp;
struct xfs_log_item *lip, *next;
uint32_t released_space = 0;
+ bool nowait = tp->t_flags & XFS_TRANS_NOWAIT;
/*
* Do all necessary memory allocation before we lock the CIL.
@@ -1632,7 +1633,12 @@ xlog_cil_commit(
xlog_cil_alloc_shadow_bufs(log, tp);
/* lock out background commit */
- down_read(&cil->xc_ctx_lock);
+ if (nowait) {
+ if (!down_read_trylock(&cil->xc_ctx_lock))
+ return -EAGAIN;
+ } else {
+ down_read(&cil->xc_ctx_lock);
+ }
if (tp->t_flags & XFS_TRANS_HAS_INTENT_DONE)
released_space = xlog_cil_process_intents(cil, tp);
@@ -1668,6 +1674,8 @@ xlog_cil_commit(
/* xlog_cil_push_background() releases cil->xc_ctx_lock */
xlog_cil_push_background(log);
+
+ return 0;
}
/*
diff --git a/fs/xfs/xfs_log_priv.h b/fs/xfs/xfs_log_priv.h
index 41edaa0ae869..eb7a1241deab 100644
--- a/fs/xfs/xfs_log_priv.h
+++ b/fs/xfs/xfs_log_priv.h
@@ -580,7 +580,7 @@ int xlog_cil_init(struct xlog *log);
void xlog_cil_init_post_recovery(struct xlog *log);
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,
+int 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);
diff --git a/fs/xfs/xfs_trans.c b/fs/xfs/xfs_trans.c
index f1f84a3dd456..e5beda636a37 100644
--- a/fs/xfs/xfs_trans.c
+++ b/fs/xfs/xfs_trans.c
@@ -1037,7 +1037,9 @@ __xfs_trans_commit(
xfs_trans_apply_sb_deltas(tp);
xfs_trans_apply_dquot_deltas(tp);
- xlog_cil_commit(log, tp, &commit_seq, regrant);
+ error = xlog_cil_commit(log, tp, &commit_seq, regrant);
+ if (error)
+ goto out_unreserve;
xfs_trans_free(tp);
--
2.25.1
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