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Date: Thu, 12 Mar 2009 22:50:19 -0400 From: Oren Laadan <orenl@...columbia.edu> To: Dave Hansen <dave@...ux.vnet.ibm.com> CC: Ingo Molnar <mingo@...e.hu>, containers <containers@...ts.linux-foundation.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "Serge E. Hallyn" <serue@...ibm.com>, Alexey Dobriyan <adobriyan@...il.com>, Christoph Hellwig <hch@...radead.org> Subject: Re: [RFC][PATCH 05/11] add generic checkpoint f_op to ext fses Note that as far as I understand, ext4 does _not_ support a "relink" operation. By "re-link" I mean an operation that re-links an (orphan) inode to a filename. (By "orphan" I mean a file that was opened and unlinked, so it does not appear in any directory anymore). This feature is very useful to efficiently checkpoint unlinked files. Oren. Dave Hansen wrote: > This marks ext[234] as being checkpointable. There will be many > more to do this to, but this is a start. > > Signed-off-by: Dave Hansen <dave@...ux.vnet.ibm.com> > --- > > linux-2.6.git-dave/fs/ext2/dir.c | 1 + > linux-2.6.git-dave/fs/ext2/file.c | 2 ++ > linux-2.6.git-dave/fs/ext3/dir.c | 1 + > linux-2.6.git-dave/fs/ext3/file.c | 1 + > linux-2.6.git-dave/fs/ext4/dir.c | 1 + > linux-2.6.git-dave/fs/ext4/file.c | 1 + > 6 files changed, 7 insertions(+) > > diff -puN fs/ext2/dir.c~add-stupid-checkpoint-to-lots-of-fses-take0 fs/ext2/dir.c > --- linux-2.6.git/fs/ext2/dir.c~add-stupid-checkpoint-to-lots-of-fses-take0 2009-03-05 08:37:01.000000000 -0800 > +++ linux-2.6.git-dave/fs/ext2/dir.c 2009-03-05 08:37:01.000000000 -0800 > @@ -721,4 +721,5 @@ const struct file_operations ext2_dir_op > .compat_ioctl = ext2_compat_ioctl, > #endif > .fsync = ext2_sync_file, > + .checkpoint = generic_file_checkpoint, > }; > diff -puN fs/ext2/file.c~add-stupid-checkpoint-to-lots-of-fses-take0 fs/ext2/file.c > --- linux-2.6.git/fs/ext2/file.c~add-stupid-checkpoint-to-lots-of-fses-take0 2009-03-05 08:37:01.000000000 -0800 > +++ linux-2.6.git-dave/fs/ext2/file.c 2009-03-05 08:37:01.000000000 -0800 > @@ -58,6 +58,7 @@ const struct file_operations ext2_file_o > .fsync = ext2_sync_file, > .splice_read = generic_file_splice_read, > .splice_write = generic_file_splice_write, > + .checkpoint = generic_file_checkpoint, > }; > > #ifdef CONFIG_EXT2_FS_XIP > @@ -73,6 +74,7 @@ const struct file_operations ext2_xip_fi > .open = generic_file_open, > .release = ext2_release_file, > .fsync = ext2_sync_file, > + .checkpoint = generic_file_checkpoint, > }; > #endif > > diff -puN fs/ext3/dir.c~add-stupid-checkpoint-to-lots-of-fses-take0 fs/ext3/dir.c > --- linux-2.6.git/fs/ext3/dir.c~add-stupid-checkpoint-to-lots-of-fses-take0 2009-03-05 08:37:01.000000000 -0800 > +++ linux-2.6.git-dave/fs/ext3/dir.c 2009-03-05 08:37:01.000000000 -0800 > @@ -48,6 +48,7 @@ const struct file_operations ext3_dir_op > #endif > .fsync = ext3_sync_file, /* BKL held */ > .release = ext3_release_dir, > + .checkpoint = generic_file_checkpoint, > }; > > > diff -puN fs/ext3/file.c~add-stupid-checkpoint-to-lots-of-fses-take0 fs/ext3/file.c > --- linux-2.6.git/fs/ext3/file.c~add-stupid-checkpoint-to-lots-of-fses-take0 2009-03-05 08:37:01.000000000 -0800 > +++ linux-2.6.git-dave/fs/ext3/file.c 2009-03-05 08:37:01.000000000 -0800 > @@ -122,6 +122,7 @@ const struct file_operations ext3_file_o > .fsync = ext3_sync_file, > .splice_read = generic_file_splice_read, > .splice_write = generic_file_splice_write, > + .checkpoint = generic_file_checkpoint, > }; > > const struct inode_operations ext3_file_inode_operations = { > diff -puN fs/ext4/dir.c~add-stupid-checkpoint-to-lots-of-fses-take0 fs/ext4/dir.c > --- linux-2.6.git/fs/ext4/dir.c~add-stupid-checkpoint-to-lots-of-fses-take0 2009-03-05 08:37:01.000000000 -0800 > +++ linux-2.6.git-dave/fs/ext4/dir.c 2009-03-05 08:37:01.000000000 -0800 > @@ -48,6 +48,7 @@ const struct file_operations ext4_dir_op > #endif > .fsync = ext4_sync_file, > .release = ext4_release_dir, > + .checkpoint = generic_file_checkpoint, > }; > > > diff -puN fs/ext4/file.c~add-stupid-checkpoint-to-lots-of-fses-take0 fs/ext4/file.c > --- linux-2.6.git/fs/ext4/file.c~add-stupid-checkpoint-to-lots-of-fses-take0 2009-03-05 08:37:01.000000000 -0800 > +++ linux-2.6.git-dave/fs/ext4/file.c 2009-03-05 08:37:01.000000000 -0800 > @@ -156,6 +156,7 @@ const struct file_operations ext4_file_o > .fsync = ext4_sync_file, > .splice_read = generic_file_splice_read, > .splice_write = generic_file_splice_write, > + .checkpoint = generic_file_checkpoint, > }; > > const struct inode_operations ext4_file_inode_operations = { > _ > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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