From: Theodore Ts'o <tytso@mit.edu>
To: Al Viro <viro@ZenIV.linux.org.uk>
Cc: Ext4 Developers List <linux-ext4@vger.kernel.org>,
Toshiyuki Okajima <toshi.okajima@jp.fujitsu.com>,
"Theodore Ts'o" <tytso@mit.edu>,
linux-fsdevel@vger.kernel.org
Subject: [PATCH 2/3] ext3: provide function to release metadata pages under memory pressure
Date: Sat, 3 Jan 2009 10:09:17 -0500 [thread overview]
Message-ID: <1230995358-24013-3-git-send-email-tytso@mit.edu> (raw)
In-Reply-To: <1230995358-24013-2-git-send-email-tytso@mit.edu>
From: Toshiyuki Okajima <toshi.okajima@jp.fujitsu.com>
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
---
fs/ext3/super.c | 20 ++++++++++++++++++++
1 files changed, 20 insertions(+), 0 deletions(-)
diff --git a/fs/ext3/super.c b/fs/ext3/super.c
index 541d5e4..93655a6 100644
--- a/fs/ext3/super.c
+++ b/fs/ext3/super.c
@@ -682,6 +682,25 @@ static struct dentry *ext3_fh_to_parent(struct super_block *sb, struct fid *fid,
ext3_nfs_get_inode);
}
+/*
+ * 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
+ * jbd 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 = EXT3_SB(sb)->s_journal;
+
+ WARN_ON(PageChecked(page));
+ if (!page_has_buffers(page))
+ return 0;
+ if (journal)
+ return journal_try_to_free_buffers(journal, page, wait);
+ return try_to_free_buffers(page);
+}
+
#ifdef CONFIG_QUOTA
#define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
#define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
@@ -746,6 +765,7 @@ static const struct super_operations ext3_sops = {
.quota_read = ext3_quota_read,
.quota_write = ext3_quota_write,
#endif
+ .bdev_try_to_free_page = bdev_try_to_free_page,
};
static const struct export_operations ext3_export_ops = {
--
1.6.0.4.8.g36f27.dirty
next prev parent reply other threads:[~2009-01-03 15:09 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-12-02 11:06 [BUG][PATCH 1/4] ext3: fix a cause of __schedule_bug via blkdev_releasepage Toshiyuki Okajima
2008-12-08 14:01 ` Theodore Tso
2008-12-08 14:06 ` [PATCH -V2] ext3: provide function to release metadata pages under memory pressure Theodore Ts'o
2008-12-08 14:06 ` [PATCH -V2] ext4: " Theodore Ts'o
2008-12-12 0:54 ` [BUG][PATCH 1/4] ext3: fix a cause of __schedule_bug via blkdev_releasepage Toshiyuki Okajima
2008-12-12 6:21 ` Theodore Tso
2008-12-12 17:52 ` [PATCH -v3] vfs: add releasepages hooks to block devices which can be used by file systems Theodore Ts'o
2008-12-12 17:52 ` [PATCH -v3] ext3: provide function to release metadata pages under memory pressure Theodore Ts'o
2008-12-12 17:52 ` [PATCH -v3] ext4: " Theodore Ts'o
2008-12-17 15:39 ` [PATCH -v3] vfs: add releasepages hooks to block devices which can be used by file systems Jan Kara
2008-12-18 5:15 ` Toshiyuki Okajima
2008-12-18 13:12 ` Jan Kara
2008-12-18 14:54 ` Theodore Tso
2008-12-18 16:38 ` Jan Kara
2008-12-19 5:15 ` Toshiyuki Okajima
2008-12-26 5:01 ` Al Viro
2009-01-03 15:09 ` Theodore Ts'o
2009-01-03 15:09 ` [PATCH 1/3] add releasepage " Theodore Ts'o
2009-01-03 15:09 ` Theodore Ts'o [this message]
2009-01-03 15:09 ` [PATCH 3/3] ext4: provide function to release metadata pages under memory pressure Theodore Ts'o
2009-01-05 8:16 ` [PATCH 1/3] add releasepage hooks to block devices which can be used by file systems Toshiyuki Okajima
2009-01-05 16:05 ` Theodore Tso
2009-01-06 4:07 ` Toshiyuki Okajima
2009-01-06 4:29 ` Theodore Tso
2008-12-15 2:21 ` [BUG][PATCH 1/4] ext3: fix a cause of __schedule_bug via blkdev_releasepage Toshiyuki Okajima
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