Ben writes:
> Actually you probably want the patch below -- only mark the super block
> dirty if the bit wasn't already set. This is what's done in 2.2, I'm not
> sure how I missed this -- probably because my superblock already had the
> compat bit set... =)
You may still want to have the flag set for the in-memory ext superblock
as well, just in case it is required/used/modified elsewhere. Even though
we are changing the superblock, I don't think we need to hold the superblock
lock for this, as it is "only" changing a bit in a very rarely used field.
However, it might be prudent to add lock_super(sb) and unlock_super(sb) if
the flag is being set for the first time.
I didn't see this code in 2.2.14 or 2.3.34, so it is probably a good idea
for Ben to submit this to Alan + Stephen for inclusion in both kernels.
> Index: linux/fs/ext2/inode.c
> ===================================================================
> RCS file: /home/bcrl/CVSROOT/kernel/linux/fs/ext2/inode.c,v
> retrieving revision 1.1.1.1
> diff -u -u -r1.1.1.1 inode.c
> --- linux/fs/ext2/inode.c 2000/01/11 02:15:58 1.1.1.1
> +++ linux/fs/ext2/inode.c 2000/02/04 19:25:59
> @@ -699,7 +699,7 @@
> else {
> inode->u.ext2_i.i_dir_acl = 0;
> inode->u.ext2_i.i_high_size = le32_to_cpu(raw_inode->i_size_high);
> - inode->i_size |= ((__u64)le32_to_cpu(raw_inode->i_size_high)) << 32;
> + inode->i_size |= ((__u64)inode->u.ext2_i.i_high_size) << 32;
> }
> inode->i_generation = le32_to_cpu(raw_inode->i_generation);
> inode->u.ext2_i.i_block_group = block_group;
> @@ -840,8 +840,22 @@
> raw_inode->i_file_acl = cpu_to_le32(inode->u.ext2_i.i_file_acl);
> if (S_ISDIR(inode->i_mode))
> raw_inode->i_dir_acl = cpu_to_le32(inode->u.ext2_i.i_dir_acl);
> - else
> + else {
> raw_inode->i_size_high = cpu_to_le32(inode->i_size >> 32);
> + if (raw_inode->i_size_high) {
> + struct super_block *sb = inode->i_sb;
> + struct ext2_super_block *es = sb->u.ext2_sb.s_es;
> + if (!(es->s_feature_ro_compat &
> + cpu_to_le32(EXT2_FEATURE_RO_COMPAT_LARGE_FILE))){
> + /* If this is the first large file
> + * created, add a flag to the superblock */
+ sb->s_feature_ro_compat |=
+ EXT2_FEATURE_RO_COMPAT_LARGE_FILE;
> + es->s_feature_ro_compat |=
> + cpu_to_le32(EXT2_FEATURE_RO_COMPAT_LARGE_FILE);
> + mark_buffer_dirty(sb->u.ext2_sb.s_sbh, 1);
> + }
> + }
> +
> + }
>
> raw_inode->i_generation = cpu_to_le32(inode->i_generation);
> if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
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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