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authorToshiyuki Okajima <toshi.okajima@jp.fujitsu.com>2009-01-05 22:38:48 -0500
committerTheodore Ts'o <tytso@mit.edu>2009-01-05 22:38:48 -0500
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ext4: provide function to release metadata pages under memory pressure
Pages in the page cache belonging to ext4 data files are released via the ext4_releasepage() function specified in the ext4 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 release_metadata function which calls jbd2_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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