[PATCH v6 2/3] xfs: check tp->t_dqinfo value instead of the XFS_TRANS_DQ_DIRTY flag

xiakaixu1987
2020-10-16T03:38:38Z

From: Kaixu Xia <kaixuxia@tencent.com>

Nowadays the only things that the XFS_TRANS_DQ_DIRTY flag seems to do
are indicates the tp->t_dqinfo->dqs[XFS_QM_TRANS_{USR,GRP,PRJ}] values
changed and check in xfs_trans_apply_dquot_deltas() and the unreserve
variant xfs_trans_unreserve_and_mod_dquots(). Actually, we also can
use the tp->t_dqinfo value instead of the XFS_TRANS_DQ_DIRTY flag, that
is to say, we allocate the new tp->t_dqinfo only when the qtrx values
changed, so the tp->t_dqinfo value isn't NULL equals the XFS_TRANS_DQ_DIRTY
flag is set, we only need to check if tp->t_dqinfo == NULL in
xfs_trans_apply_dquot_deltas() and its unreserve variant to determine
whether lock all of the dquots and join them to the transaction.

Signed-off-by: Kaixu Xia <kaixuxia@tencent.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
---
fs/xfs/libxfs/xfs_shared.h | 1 -
fs/xfs/xfs_inode.c | 8 +-------
fs/xfs/xfs_trans_dquot.c | 13 ++-----------
3 files changed, 3 insertions(+), 19 deletions(-)

diff --git a/fs/xfs/libxfs/xfs_shared.h b/fs/xfs/libxfs/xfs_shared.h
index c795ae47b3c9..8c61a461bf7b 100644
--- a/fs/xfs/libxfs/xfs_shared.h
+++ b/fs/xfs/libxfs/xfs_shared.h
@@ -62,7 +62,6 @@ void xfs_log_get_max_trans_res(struct xfs_mount *mp,
#define XFS_TRANS_SB_DIRTY 0x02 /* superblock is modified */
#define XFS_TRANS_PERM_LOG_RES 0x04 /* xact took a permanent log res */
#define XFS_TRANS_SYNC 0x08 /* make commit synchronous */
-#define XFS_TRANS_DQ_DIRTY 0x10 /* at least one dquot in trx dirty */
#define XFS_TRANS_RESERVE 0x20 /* OK to use reserved data blocks */
#define XFS_TRANS_NO_WRITECOUNT 0x40 /* do not elevate SB writecount */
#define XFS_TRANS_RES_FDBLKS 0x80 /* reserve newly freed blocks */
diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
index 20bb5fae0d00..16885624015e 100644
--- a/fs/xfs/xfs_inode.c
+++ b/fs/xfs/xfs_inode.c
@@ -959,7 +959,6 @@ xfs_dir_ialloc(
xfs_buf_t *ialloc_context = NULL;
int code;
void *dqinfo;
- uint tflags;

tp = *tpp;
ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES);
@@ -1018,12 +1017,9 @@ xfs_dir_ialloc(
* and attach it to the next transaction.
*/
dqinfo = NULL;
- tflags = 0;
if (tp->t_dqinfo) {
dqinfo = (void *)tp->t_dqinfo;
tp->t_dqinfo = NULL;
- tflags = tp->t_flags & XFS_TRANS_DQ_DIRTY;
- tp->t_flags &= ~(XFS_TRANS_DQ_DIRTY);
}

code = xfs_trans_roll(&tp);
@@ -1031,10 +1027,8 @@ xfs_dir_ialloc(
/*
* Re-attach the quota info that we detached from prev trx.
*/
- if (dqinfo) {
+ if (dqinfo)
tp->t_dqinfo = dqinfo;
- tp->t_flags |= tflags;
- }

if (code) {
xfs_buf_relse(ialloc_context);
diff --git a/fs/xfs/xfs_trans_dquot.c b/fs/xfs/xfs_trans_dquot.c
index 67f1e275b34d..0ebfd7930382 100644
--- a/fs/xfs/xfs_trans_dquot.c
+++ b/fs/xfs/xfs_trans_dquot.c
@@ -84,13 +84,6 @@ xfs_trans_dup_dqinfo(

xfs_trans_alloc_dqinfo(ntp);

- /*
- * Because the quota blk reservation is carried forward,
- * it is also necessary to carry forward the DQ_DIRTY flag.
- */
- if (otp->t_flags & XFS_TRANS_DQ_DIRTY)
- ntp->t_flags |= XFS_TRANS_DQ_DIRTY;
-
for (j = 0; j < XFS_QM_TRANS_DQTYPES; j++) {
oqa = otp->t_dqinfo->dqs[j];
nqa = ntp->t_dqinfo->dqs[j];
@@ -270,8 +263,6 @@ xfs_trans_mod_dquot(

if (delta)
trace_xfs_trans_mod_dquot_after(qtrx);
-
- tp->t_flags |= XFS_TRANS_DQ_DIRTY;
}

@@ -348,7 +339,7 @@ xfs_trans_apply_dquot_deltas(
int64_t totalbdelta;
int64_t totalrtbdelta;

- if (!(tp->t_flags & XFS_TRANS_DQ_DIRTY))
+ if (!tp->t_dqinfo)
return;

ASSERT(tp->t_dqinfo);
@@ -490,7 +481,7 @@ xfs_trans_unreserve_and_mod_dquots(
struct xfs_dqtrx *qtrx, *qa;
bool locked;

- if (!tp->t_dqinfo || !(tp->t_flags & XFS_TRANS_DQ_DIRTY))
+ if (!tp->t_dqinfo)
return;

for (j = 0; j < XFS_QM_TRANS_DQTYPES; j++) {
--
2.20.0