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    SubjectRe: [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@linux.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 = {
    > _
    >


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