You write:
> Just resently I have started messing with the lfs facilities now
> in place in the devel kernels and I have run into a few problems.
>
> Here are my problems:
>
> o I can create files larger than 4GB BUT I cannot remove them cleanly.
> o On a reboot e2fsck truncates any file larger than 4GB to 4GB.
>
> Also... the first time I ran e2fsck it complained to me about having a large
> file on the FS... It said I needed to turn on some flag in the superblock
> (I cant remember the name) to enable LFS support... How do I turn it on
> if e2fsck didnt already? What is the flag named? Is there any real docs
> on how to set up LFS in linux? I cant seem to find any.
You didn't mention if you installed a new e2fsprogs. The latest version
is 1.18 I believe. However, looking through the ext2 code that I have
(2.3.34 only), it does not set the EXT2_FEATURE_RO_COMPAT_LARGE_FILE flag
in the superblock as far as I can see, so e2fsck probably has no chance to
get it right anyways. If it isn't already in the recent kernel, you need
something like the following in fs/ext2/inode.c:ext2_update_inode():
if (S_ISDIR(inode->i_mode))
raw_inode->i_dir_acl = cpu_to_le32(inode->u.ext2_i.i_dir_acl);
| else {
raw_inode->i_size_high = cpu_to_le32(inode->i_size >> 32);
+ if (raw_inode->i_size_high)
+ inode->i_sb->u.ext2_sb.s_feature_ro_compat |=
+ EXT2_FEATURE_RO_COMPAT_LARGE_FILE;
+ }
I'm not 100% sure this is the right way to do it (not even sure that the
syntax is correct), but at least it's a start... It seems likely that
you may also need to have (in addition to or instead of the above):
+ inode->i_sb->u.ext2_sb.s_es->s_feature_ro_compat |=
+ EXT2_FEATURE_RO_COMPAT_LARGE_FILE;
+ mark_buffer_dirty(inode->i_sb->u.ext2_sb.s_sbh, 1);
+ inode->i_sb->s_dirt = 1;
The latter will change the superblock on the disk - note the s_es in there,
and it should be written out when it is marked dirty. It may also be
nice to check if the flag is already set via EXT2_HAS_RO_COMPAT_FEATURE()
so we don't write out the superblock for each update of a large file...
Cheers, Andreas
--
Andreas Dilger \ "If a man ate a pound of pasta and a pound of antipasto,
\ would they cancel out, leaving him still hungry?"
http://www-mddsp.enel.ucalgary.ca/People/adilger/ -- Dogbert
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This archive was generated by hypermail 2b29 : Fri Feb 04 2000 - 11:59:09 EST