From: Ryusuke Konishi <konishi.ryusuke@gmail.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: linux-nilfs@vger.kernel.org, Matthew Wilcox <willy@infradead.org>,
linux-kernel@vger.kernel.org
Subject: [PATCH 02/17] nilfs2: eliminate staggered calls to kunmap in nilfs_rename
Date: Mon, 27 Nov 2023 23:30:21 +0900 [thread overview]
Message-ID: <20231127143036.2425-3-konishi.ryusuke@gmail.com> (raw)
In-Reply-To: <20231127143036.2425-1-konishi.ryusuke@gmail.com>
In nilfs_rename(), calls to nilfs_put_page() to release pages obtained
with nilfs_find_entry() or nilfs_dotdot() are alternated in the normal
path.
When replacing the kernel memory mapping method from kmap to
kmap_local_{page,folio}, this violates the constraint on the calling
order of kunmap_local().
Swap the order of nilfs_put_page calls where the kmap sections of
multiple pages overlap so that they are nested, allowing direct
replacement of nilfs_put_page() -> unmap_and_put_page().
Without this reordering, that replacement will cause a kernel WARNING
in kunmap_local_indexed() on architectures with high memory mapping.
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@gmail.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
---
fs/nilfs2/namei.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/fs/nilfs2/namei.c b/fs/nilfs2/namei.c
index 99255694cbe9..d179db8074c2 100644
--- a/fs/nilfs2/namei.c
+++ b/fs/nilfs2/namei.c
@@ -411,13 +411,14 @@ static int nilfs_rename(struct mnt_idmap *idmap,
inode_set_ctime_current(old_inode);
nilfs_delete_entry(old_de, old_page);
- nilfs_put_page(old_page);
if (dir_de) {
nilfs_set_link(old_inode, dir_de, dir_page, new_dir);
nilfs_put_page(dir_page);
drop_nlink(old_dir);
}
+ nilfs_put_page(old_page);
+
nilfs_mark_inode_dirty(old_dir);
nilfs_mark_inode_dirty(old_inode);
--
2.34.1
next prev parent reply other threads:[~2023-11-27 14:30 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-11-27 14:30 [PATCH 00/17] nilfs2: Folio conversions for directory paths Ryusuke Konishi
2023-11-27 14:30 ` [PATCH 01/17] nilfs2: move page release outside of nilfs_delete_entry and nilfs_set_link Ryusuke Konishi
2023-11-27 17:08 ` Matthew Wilcox
2023-11-27 14:30 ` Ryusuke Konishi [this message]
2023-11-27 17:08 ` [PATCH 02/17] nilfs2: eliminate staggered calls to kunmap in nilfs_rename Matthew Wilcox
2023-11-27 14:30 ` [PATCH 03/17] nilfs2: Remove page_address() from nilfs_set_link Ryusuke Konishi
2023-11-27 14:30 ` [PATCH 04/17] nilfs2: Remove page_address() from nilfs_add_link Ryusuke Konishi
2023-11-27 14:30 ` [PATCH 05/17] nilfs2: Remove page_address() from nilfs_delete_entry Ryusuke Konishi
2023-11-27 14:30 ` [PATCH 06/17] nilfs2: Return the mapped address from nilfs_get_page() Ryusuke Konishi
2023-11-27 14:30 ` [PATCH 07/17] nilfs2: Pass the mapped address to nilfs_check_page() Ryusuke Konishi
2023-11-27 14:30 ` [PATCH 08/17] nilfs2: Switch to kmap_local for directory handling Ryusuke Konishi
2023-11-27 14:30 ` [PATCH 09/17] nilfs2: Add nilfs_get_folio() Ryusuke Konishi
2023-11-27 14:30 ` [PATCH 10/17] nilfs2: Convert nilfs_readdir to use a folio Ryusuke Konishi
2023-11-27 14:30 ` [PATCH 11/17] nilfs2: Convert nilfs_find_entry " Ryusuke Konishi
2023-11-27 14:30 ` [PATCH 12/17] nilfs2: Convert nilfs_rename() to use folios Ryusuke Konishi
2023-11-27 14:30 ` [PATCH 13/17] nilfs2: Convert nilfs_add_link() to use a folio Ryusuke Konishi
2023-11-27 14:30 ` [PATCH 14/17] nilfs2: Convert nilfs_empty_dir() " Ryusuke Konishi
2023-11-27 14:30 ` [PATCH 15/17] nilfs2: Convert nilfs_make_empty() " Ryusuke Konishi
2023-11-27 14:30 ` [PATCH 16/17] nilfs2: Convert nilfs_prepare_chunk() and nilfs_commit_chunk() to folios Ryusuke Konishi
2023-11-27 14:30 ` [PATCH 17/17] nilfs2: Convert nilfs_page_bug() to nilfs_folio_bug() Ryusuke Konishi
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