[PATCH v3 2/6] xfs: introduce xfs_dialloc_roll()

Gao Xiang
2020-12-07T00:18:07Z

From: Dave Chinner <dchinner@redhat.com>

Introduce a helper to make the on-disk inode allocation rolling
logic clearer in preparation of the following cleanup.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Gao Xiang <hsiangkao@redhat.com>
---
fs/xfs/libxfs/xfs_ialloc.c | 45 ++++++++++++++++++++++++++++++++++++++
fs/xfs/libxfs/xfs_ialloc.h | 6 +++++
fs/xfs/xfs_inode.c | 39 +--------------------------------
3 files changed, 52 insertions(+), 38 deletions(-)

diff --git a/fs/xfs/libxfs/xfs_ialloc.c b/fs/xfs/libxfs/xfs_ialloc.c
index 45cf7e55f5ee..3d2862e3ff41 100644
--- a/fs/xfs/libxfs/xfs_ialloc.c
+++ b/fs/xfs/libxfs/xfs_ialloc.c
@@ -1682,6 +1682,51 @@ xfs_dialloc_ag(
return error;
}

+int
+xfs_dialloc_roll(
+ struct xfs_trans **tpp,
+ struct xfs_buf *agibp)
+{
+ struct xfs_trans *tp = *tpp;
+ struct xfs_dquot_acct *dqinfo = NULL;
+ unsigned int tflags = 0;
+ int error;
+
+ /*
+ * Hold to on to the agibp across the commit so no other allocation can
+ * come in and take the free inodes we just allocated for our caller.
+ */
+ xfs_trans_bhold(tp, agibp);
+
+ /*
+ * We want the quota changes to be associated with the next transaction,
+ * NOT this one. So, detach the dqinfo from this and attach it to the
+ * next transaction.
+ */
+ if (tp->t_dqinfo) {
+ dqinfo = tp->t_dqinfo;
+ tp->t_dqinfo = NULL;
+ tflags = tp->t_flags & XFS_TRANS_DQ_DIRTY;
+ tp->t_flags &= ~(XFS_TRANS_DQ_DIRTY);
+ }
+
+ error = xfs_trans_roll(&tp);
+
+ /* Re-attach the quota info that we detached from prev trx. */
+ if (dqinfo) {
+ tp->t_dqinfo = dqinfo;
+ tp->t_flags |= tflags;
+ }
+
+ *tpp = tp;
+ if (error) {
+ xfs_buf_relse(agibp);
+ return error;
+ }
+ xfs_trans_bjoin(tp, agibp);
+ return 0;
+}
+
/*
* Allocate an inode on disk.
*
diff --git a/fs/xfs/libxfs/xfs_ialloc.h b/fs/xfs/libxfs/xfs_ialloc.h
index 72b3468b97b1..a145e2a72530 100644
--- a/fs/xfs/libxfs/xfs_ialloc.h
+++ b/fs/xfs/libxfs/xfs_ialloc.h
@@ -32,6 +32,12 @@ xfs_make_iptr(struct xfs_mount *mp, struct xfs_buf *b, int o)
return xfs_buf_offset(b, o << (mp)->m_sb.sb_inodelog);
}

+/* XXX: will be removed in the following patch */
+int
+xfs_dialloc_roll(
+ struct xfs_trans **tpp,
+ struct xfs_buf *agibp);
+
/*
* Allocate an inode on disk.
* Mode is used to tell whether the new inode will need space, and whether
diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
index 2bfbcf28b1bd..6672cdffcda5 100644
--- a/fs/xfs/xfs_inode.c
+++ b/fs/xfs/xfs_inode.c
@@ -958,8 +958,6 @@ xfs_dir_ialloc(
xfs_inode_t *ip;
xfs_buf_t *ialloc_context = NULL;
int code;
- void *dqinfo;
- uint tflags;

tp = *tpp;
ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES);
@@ -1003,46 +1001,12 @@ xfs_dir_ialloc(
* to succeed the second time.
*/
if (ialloc_context) {
- /*
- * Normally, xfs_trans_commit releases all the locks.
- * We call bhold to hang on to the ialloc_context across
- * the commit. Holding this buffer prevents any other
- * processes from doing any allocations in this
- * allocation group.
- */
- xfs_trans_bhold(tp, ialloc_context);
-
- /*
- * We want the quota changes to be associated with the next
- * transaction, NOT this one. So, detach the dqinfo from this
- * 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);
-
- /*
- * Re-attach the quota info that we detached from prev trx.
- */
- if (dqinfo) {
- tp->t_dqinfo = dqinfo;
- tp->t_flags |= tflags;
- }
-
+ code = xfs_dialloc_roll(&tp, ialloc_context);
if (code) {
- xfs_buf_relse(ialloc_context);
*tpp = tp;
*ipp = NULL;
return code;
}
- xfs_trans_bjoin(tp, ialloc_context);

/*
* Call ialloc again. Since we've locked out all
@@ -1062,7 +1026,6 @@ xfs_dir_ialloc(
return code;
}
ASSERT(!ialloc_context && ip);
-
}

*ipp = ip;
--
2.18.4