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 <[email protected]> > --- > > 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 = { > _ > _______________________________________________ Containers mailing list [email protected] https://lists.linux-foundation.org/mailman/listinfo/containers _______________________________________________ Devel mailing list [email protected] https://openvz.org/mailman/listinfo/devel
