[PATCH 14/29] xfs: support nowait for xfs_log_reserve()

Hao Xu
2023-08-25T14:01:45Z

Support nowait logic for xfs_log_reserve(), including add a nowait
boolean parameter and error out -EAGAIN for ticket allocation.

Signed-off-by: Hao Xu <howeyxu@tencent.com>
---
fs/xfs/xfs_log.c | 18 +++++++++++++-----
fs/xfs/xfs_log.h | 5 +++--
fs/xfs/xfs_log_cil.c | 2 +-
fs/xfs/xfs_log_priv.h | 2 +-
fs/xfs/xfs_trans.c | 5 +++--
5 files changed, 21 insertions(+), 11 deletions(-)

diff --git a/fs/xfs/xfs_log.c b/fs/xfs/xfs_log.c
index 79004d193e54..90fbb1c0eca2 100644
--- a/fs/xfs/xfs_log.c
+++ b/fs/xfs/xfs_log.c
@@ -462,7 +462,8 @@ xfs_log_reserve(
int unit_bytes,
int cnt,
struct xlog_ticket **ticp,
- bool permanent)
+ bool permanent,
+ bool nowait)
{
struct xlog *log = mp->m_log;
struct xlog_ticket *tic;
@@ -475,7 +476,9 @@ xfs_log_reserve(
XFS_STATS_INC(mp, xs_try_logspace);

ASSERT(*ticp == NULL);
- tic = xlog_ticket_alloc(log, unit_bytes, cnt, permanent);
+ tic = xlog_ticket_alloc(log, unit_bytes, cnt, permanent, nowait);
+ if (!tic)
+ return -EAGAIN;
*ticp = tic;

xlog_grant_push_ail(log, tic->t_cnt ? tic->t_unit_res * tic->t_cnt
@@ -974,7 +977,7 @@ xlog_unmount_write(
struct xlog_ticket *tic = NULL;
int error;

- error = xfs_log_reserve(mp, 600, 1, &tic, 0);
+ error = xfs_log_reserve(mp, 600, 1, &tic, 0, false);
if (error)
goto out_err;

@@ -3527,12 +3530,17 @@ xlog_ticket_alloc(
struct xlog *log,
int unit_bytes,
int cnt,
- bool permanent)
+ bool permanent,
+ bool nowait)
{
struct xlog_ticket *tic;
int unit_res;

- tic = kmem_cache_zalloc(xfs_log_ticket_cache, GFP_NOFS | __GFP_NOFAIL);
+ gfp_t gfp_flags = GFP_NOFS |
+ (nowait ? 0 : __GFP_NOFAIL);
+ tic = kmem_cache_zalloc(xfs_log_ticket_cache, gfp_flags);
+ if (!tic)
+ return NULL;

unit_res = xlog_calc_unit_res(log, unit_bytes, &tic->t_iclog_hdrs);

diff --git a/fs/xfs/xfs_log.h b/fs/xfs/xfs_log.h
index 2728886c2963..ba515df443c3 100644
--- a/fs/xfs/xfs_log.h
+++ b/fs/xfs/xfs_log.h
@@ -139,8 +139,9 @@ void xfs_log_mount_cancel(struct xfs_mount *);
xfs_lsn_t xlog_assign_tail_lsn(struct xfs_mount *mp);
xfs_lsn_t xlog_assign_tail_lsn_locked(struct xfs_mount *mp);
void xfs_log_space_wake(struct xfs_mount *mp);
-int xfs_log_reserve(struct xfs_mount *mp, int length, int count,
- struct xlog_ticket **ticket, bool permanent);
+int xfs_log_reserve(struct xfs_mount *mp, int length,
+ int count, struct xlog_ticket **ticket,
+ bool permanent, bool nowait);
int xfs_log_regrant(struct xfs_mount *mp, struct xlog_ticket *tic);
void xfs_log_unmount(struct xfs_mount *mp);
bool xfs_log_writable(struct xfs_mount *mp);
diff --git a/fs/xfs/xfs_log_cil.c b/fs/xfs/xfs_log_cil.c
index eccbfb99e894..f17c1799b3c4 100644
--- a/fs/xfs/xfs_log_cil.c
+++ b/fs/xfs/xfs_log_cil.c
@@ -37,7 +37,7 @@ xlog_cil_ticket_alloc(
{
struct xlog_ticket *tic;

- tic = xlog_ticket_alloc(log, 0, 1, 0);
+ tic = xlog_ticket_alloc(log, 0, 1, 0, false);

/*
* set the current reservation to zero so we know to steal the basic
diff --git a/fs/xfs/xfs_log_priv.h b/fs/xfs/xfs_log_priv.h
index 1bd2963e8fbd..41edaa0ae869 100644
--- a/fs/xfs/xfs_log_priv.h
+++ b/fs/xfs/xfs_log_priv.h
@@ -503,7 +503,7 @@ extern __le32 xlog_cksum(struct xlog *log, struct xlog_rec_header *rhead,

extern struct kmem_cache *xfs_log_ticket_cache;
struct xlog_ticket *xlog_ticket_alloc(struct xlog *log, int unit_bytes,
- int count, bool permanent);
+ int count, bool permanent, bool nowait);

void xlog_print_tic_res(struct xfs_mount *mp, struct xlog_ticket *ticket);
void xlog_print_trans(struct xfs_trans *);
diff --git a/fs/xfs/xfs_trans.c b/fs/xfs/xfs_trans.c
index dbec685f4f4a..7988b4c7f36e 100644
--- a/fs/xfs/xfs_trans.c
+++ b/fs/xfs/xfs_trans.c
@@ -155,6 +155,7 @@ xfs_trans_reserve(
struct xfs_mount *mp = tp->t_mountp;
int error = 0;
bool rsvd = (tp->t_flags & XFS_TRANS_RESERVE) != 0;
+ bool nowait = tp->t_flags & XFS_TRANS_NOWAIT;

/*
* Attempt to reserve the needed disk blocks by decrementing
@@ -192,8 +193,8 @@ xfs_trans_reserve(
error = xfs_log_regrant(mp, tp->t_ticket);
} else {
error = xfs_log_reserve(mp, resp->tr_logres,
- resp->tr_logcount,
- &tp->t_ticket, permanent);
+ resp->tr_logcount, &tp->t_ticket,
+ permanent, nowait);
}

if (error)
--
2.25.1