Okajima-san, I've added your patches to the ext4 patch queue for testing. I did make some changes to the commit descriptions for clarity's sake ------------------------- vfs: add releasepages hooks to block devices which can be used by file systems From: Toshiyuki Okajima <toshi.okajima@xxxxxxxxxxxxxx> Implement blkdev_releasepage() to release the buffer_heads and page after we release private data which belongs to a client of the block device, such as a filesystem. blkdev_releasepage() call the client's releasepage() which is registered by blkdev_register_client_releasepage() to release its private data. Signed-off-by: Toshiyuki Okajima <toshi.okajima@xxxxxxxxxxxxxx> Signed-off-by: "Theodore Ts'o" <tytso@xxxxxxx> Cc: linux-fsdevel@xxxxxxxxxxxxxxx ------------------------- ext3: provide function to release journal heads under memory pressure From: Toshiyuki Okajima <toshi.okajima@xxxxxxxxxxxxxx> 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 release_metadata function which is called by the block device's blkdev_releasepage() function, which calls journal_try_to_free_buffers() function to free the metadata. Signed-off-by: Toshiyuki Okajima <toshi.okajima@xxxxxxxxxxxxxx> Signed-off-by: "Theodore Ts'o" <tytso@xxxxxxx> Cc: linux-fsdevel@xxxxxxxxxxxxxxx ------------------------- ext4: implement release_metadata to release private data under memory pressure From: Toshiyuki Okajima <toshi.okajima@xxxxxxxxxxxxxx> 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 is called by the block device's blkdev_releasepage() function, which calls journal_try_to_free_buffers() function to free the metadata. Signed-off-by: Toshiyuki Okajima <toshi.okajima@xxxxxxxxxxxxxx> Signed-off-by: "Theodore Ts'o" <tytso@xxxxxxx> Cc: linux-fsdevel@xxxxxxxxxxxxxxx ---------------------- Also, in the 2nd and 3rd patches, I made change to the comment describing ext[34]_release_metadata. It now reads: /* * 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[2] layer's try_to_free_buffers() function to release them. */ I hope you agree these changes are more descriptive of what is going on in the patch. Best regards, - Ted -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
