[PATCH 14/36] xfs: insert the pag structures into the xarray later

Darrick J. Wong
2024-12-06T23:33:55Z

From: Christoph Hellwig <hch@lst.de>

Source kernel commit: d66496578b2a099ea453f56782f1cd2bf63a8029

Cleaning up is much easier if a structure can't be looked up yet, so only
insert the pag once it is fully set up.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
---
libxfs/xfs_ag.c | 31 +++++++++++++++----------------
1 file changed, 15 insertions(+), 16 deletions(-)

diff --git a/libxfs/xfs_ag.c b/libxfs/xfs_ag.c
index 8809d76d496ae9..e22ce4e83f4a62 100644
--- a/libxfs/xfs_ag.c
+++ b/libxfs/xfs_ag.c
@@ -305,15 +305,6 @@ xfs_perag_alloc(
if (!pag)
return -ENOMEM;

- pag->pag_agno = index;
- pag->pag_mount = mp;
-
- error = xa_insert(&mp->m_perags, index, pag, GFP_KERNEL);
- if (error) {
- WARN_ON_ONCE(error == -EBUSY);
- goto out_free_pag;
- }
-
#ifdef __KERNEL__
/* Place kernel structure only init below this point. */
spin_lock_init(&pag->pag_ici_lock);
@@ -329,10 +320,7 @@ xfs_perag_alloc(

error = xfs_buf_cache_init(&pag->pag_bcache);
if (error)
- goto out_remove_pag;
-
- /* Active ref owned by mount indicates AG is online. */
- atomic_set(&pag->pag_active_ref, 1);
+ goto out_defer_drain_free;

/*
* Pre-calculated geometry
@@ -342,12 +330,23 @@ xfs_perag_alloc(
__xfs_agino_range(mp, pag->block_count, &pag->agino_min,
&pag->agino_max);

+ pag->pag_agno = index;
+ pag->pag_mount = mp;
+ /* Active ref owned by mount indicates AG is online. */
+ atomic_set(&pag->pag_active_ref, 1);
+
+ error = xa_insert(&mp->m_perags, index, pag, GFP_KERNEL);
+ if (error) {
+ WARN_ON_ONCE(error == -EBUSY);
+ goto out_buf_cache_destroy;
+ }
+
return 0;

-out_remove_pag:
+out_buf_cache_destroy:
+ xfs_buf_cache_destroy(&pag->pag_bcache);
+out_defer_drain_free:
xfs_defer_drain_free(&pag->pag_intents_drain);
- pag = xa_erase(&mp->m_perags, index);
-out_free_pag:
kfree(pag);
return error;
}