From: Zhang Yi
mainline inclusion
from mainline-5.14-rc1
commit 3b672e3aedffc9f092e7e7eae0050a97a8ca508e
category: bugfix
issue: #I3ZXZF
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...
---------------------------
After we introduce a jbd2 shrinker to release checkpointed buffer's
journal head, we could free buffer without bdev_try_to_free_page()
under memory pressure. So this patch remove the whole
bdev_try_to_free_page() callback directly. It also remove many
use-after-free issues relate to it together.
Signed-off-by: Zhang Yi
Reviewed-by: Jan Kara
Link: https://lore.kernel.org/r/20210610112440.3438139-8-yi.zhang@huawei.com
Signed-off-by: Theodore Ts'o
Reviewed-by: Yang Erkun
Signed-off-by: Chen Jun
Signed-off-by: Yu Changchun
---
fs/ext4/super.c | 21 ---------------------
1 file changed, 21 deletions(-)
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 0ccf17a93f46..f0d6188ed278 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -1449,26 +1449,6 @@ static int ext4_nfs_commit_metadata(struct inode *inode)
return ext4_write_inode(inode, &wbc);
}
-/*
- * Try to release metadata pages (indirect blocks, directories) which are
- * mapped via the block device. Since these pages could have journal heads
- * which would prevent try_to_free_buffers() from freeing them, we must use
- * jbd2 layer's try_to_free_buffers() function to release them.
- */
-static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
- gfp_t wait)
-{
- journal_t *journal = EXT4_SB(sb)->s_journal;
-
- WARN_ON(PageChecked(page));
- if (!page_has_buffers(page))
- return 0;
- if (journal)
- return jbd2_journal_try_to_free_buffers(journal, page);
-
- return try_to_free_buffers(page);
-}
-
#ifdef CONFIG_FS_ENCRYPTION
static int ext4_get_context(struct inode *inode, void *ctx, size_t len)
{
@@ -1663,7 +1643,6 @@ static const struct super_operations ext4_sops = {
.quota_write = ext4_quota_write,
.get_dquots = ext4_get_dquots,
#endif
- .bdev_try_to_free_page = bdev_try_to_free_page,
};
static const struct export_operations ext4_export_ops = {
--
2.22.0
