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From: Andreas Dilger on 17 Mar 2010 17:10
On 2010-03-17, at 10:08, Oren Laadan wrote:
> These patches extend the use of the generic file checkpoint
> operation to
> non-extX filesystems which have lseek operations that ensure we can
> save
> and restore the files for later use. Note that this does not include
> things like FUSE, network filesystems, or pseudo-filesystem kernel
> interfaces.

I didn't see any other patches posted to linux-fsdevel regarding what
this code is, or what it is supposed to be doing. Could you please
repost the patches related to generic_file_checkpoint(), and the
overview email that explains what you mean by "checkpoint". I'm
assuming this is related to HPC/process restart/migration, but better
to not guess.

> @@ -718,6 +718,7 @@ static const struct file_operations
> btrfs_ctl_fops = {
> .unlocked_ioctl = btrfs_control_ioctl,
> .compat_ioctl = btrfs_control_ioctl,
> .owner = THIS_MODULE,
> + .checkpoint = generic_file_checkpoint,
> };
>
> const struct file_operations exofs_file_operations = {
> .llseek = generic_file_llseek,
> + .checkpoint = generic_file_checkpoint,
> .read = do_sync_read,
> .write = do_sync_write,
> .aio_read = generic_file_aio_read,
>
> static const struct file_operations hostfs_file_fops = {
> .llseek = generic_file_llseek,
> + .checkpoint = generic_file_checkpoint,
> .read = do_sync_read,
> .splice_read = generic_file_splice_read,
> .aio_read = generic_file_aio_read,
> @@ -430,6 +431,7 @@ static const struct file_operations
> hostfs_file_fops = {
>
> static const struct file_operations hostfs_dir_fops = {
> .llseek = generic_file_llseek,
> + .checkpoint = generic_file_checkpoint,
> .readdir = hostfs_readdir,
> .read = generic_read_dir,
> };
>
> const struct file_operations nilfs_file_operations = {
> .llseek = generic_file_llseek,
> + .checkpoint = generic_file_checkpoint,
> .read = do_sync_read,
> .write = do_sync_write,
> .aio_read = generic_file_aio_read,


Minor nit - it would be good to add this method in the same place in
all of the *_file_operation structures for consistency. Ideally these
would already be in the order that they are declared in the structure,
but at least new ones should be added consistently.

> static const struct vm_operations_struct nfs_file_vm_ops = {
> .fault = filemap_fault,
> .page_mkwrite = nfs_vm_page_mkwrite,
> +#ifdef CONFIG_CHECKPOINT
> + .checkpoint = filemap_checkpoint,
> +#endif
> };

Why is this one conditional, but the others are not?


Cheers, Andreas
--
Andreas Dilger
Sr. Staff Engineer, Lustre Group
Sun Microsystems of Canada, Inc.

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