ext3: provide function to release metadata pages under memory pressure
Pages in the page cache belonging to ext3 data files are released via the ext3_releasepage() function specified in the ext3 inode's address_space_ops. However, metadata blocks (such as indirect blocks, directory blocks, etc) are managed via the block device address_space_ops, and they can not be released by try_to_free_buffers() if they have a journal head attached to them. To address this, we supply a try_to_free_pages() function which calls journal_try_to_free_buffers() function to free the metadata, and which is called by the block device's blkdev_releasepage() function. Signed-off-by: Toshiyuki Okajima <toshi.okajima@jp.fujitsu.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu> Cc: linux-fsdevel@vger.kernel.org
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@ -682,6 +682,26 @@ static struct dentry *ext3_fh_to_parent(struct super_block *sb, struct fid *fid,
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ext3_nfs_get_inode);
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}
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/*
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* Try to release metadata pages (indirect blocks, directories) which are
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* mapped via the block device. Since these pages could have journal heads
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* which would prevent try_to_free_buffers() from freeing them, we must use
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* jbd layer's try_to_free_buffers() function to release them.
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*/
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static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
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gfp_t wait)
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{
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journal_t *journal = EXT3_SB(sb)->s_journal;
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WARN_ON(PageChecked(page));
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if (!page_has_buffers(page))
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return 0;
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if (journal)
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return journal_try_to_free_buffers(journal, page,
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wait & ~__GFP_WAIT);
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return try_to_free_buffers(page);
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}
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#ifdef CONFIG_QUOTA
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#define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
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#define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
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@ -746,6 +766,7 @@ static const struct super_operations ext3_sops = {
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.quota_read = ext3_quota_read,
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.quota_write = ext3_quota_write,
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#endif
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.bdev_try_to_free_page = bdev_try_to_free_page,
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};
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static const struct export_operations ext3_export_ops = {
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