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Date: Thu, 10 Jun 2021 19:24:39 +0800 From: Zhang Yi <yi.zhang@...wei.com> To: <linux-ext4@...r.kernel.org>, <linux-fsdevel@...r.kernel.org>, <jack@...e.cz>, <tytso@....edu> CC: <adilger.kernel@...ger.ca>, <david@...morbit.com>, <hch@...radead.org>, <yi.zhang@...wei.com> Subject: [RFC PATCH v4 7/8] ext4: remove bdev_try_to_free_page() callback 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 <yi.zhang@...wei.com> Reviewed-by: Jan Kara <jack@...e.cz> --- fs/ext4/super.c | 21 --------------------- 1 file changed, 21 deletions(-) diff --git a/fs/ext4/super.c b/fs/ext4/super.c index 80064e566f56..cff882cf0847 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -1442,26 +1442,6 @@ 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) { @@ -1656,7 +1636,6 @@ 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 = { -- 2.31.1
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