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SubjectRe: [PATCH] comment out obsolete ext2 code
Date
I previously wrote:
> This patch comments out code in ext2 which is obsolete, or was never used
> in the first place (i.e. future vision stuff, etc). In particular, the
> inode->i_attr_flags field is not used anywhere else in the kernel, and it
> is only set, but not referenced in the ext2 code. It could probably be
> deleted entirely (saving 4 bytes in struct inode).

> Similarly, the ext2_notify_change() function is not currently in use (but
> it may be needed at some time in the future). However, per previous
> discussions with Stephen on ext2-devel, the 2.4 code is buggy (2.2 code
> was fixed), so even though it is currently unused I have fixed it. The
> brokenness in question also relates to i_attr_flags, so it could also
> be deleted entirely if that is the goal.
>
> There are a couple of other obsolete bits not removed by this patch,
> namely i_osync, and i_new_inode in ext2_inode_info. Another day...

Now for the patch...

Cheers, Andreas
========================================================================
diff -ru linux-2.4.6.orig/fs/ext2/inode.c linux-2.4.6-aed/fs/ext2/inode.c
--- linux-2.4.6.orig/fs/ext2/inode.c Thu Jun 28 14:28:24 2001
+++ linux-2.4.6-aed/fs/ext2/inode.c Thu Jun 28 14:27:24 2001
@@ -1003,21 +998,21 @@
init_special_inode(inode, inode->i_mode,
le32_to_cpu(raw_inode->i_block[0]));
brelse (bh);
- inode->i_attr_flags = 0;
+ /* inode->i_attr_flags = 0; unused */
if (inode->u.ext2_i.i_flags & EXT2_SYNC_FL) {
- inode->i_attr_flags |= ATTR_FLAG_SYNCRONOUS;
+ /* inode->i_attr_flags |= ATTR_FLAG_SYNCRONOUS; unused */
inode->i_flags |= S_SYNC;
}
if (inode->u.ext2_i.i_flags & EXT2_APPEND_FL) {
- inode->i_attr_flags |= ATTR_FLAG_APPEND;
+ /* inode->i_attr_flags |= ATTR_FLAG_APPEND; unused */
inode->i_flags |= S_APPEND;
}
if (inode->u.ext2_i.i_flags & EXT2_IMMUTABLE_FL) {
- inode->i_attr_flags |= ATTR_FLAG_IMMUTABLE;
+ /* inode->i_attr_flags |= ATTR_FLAG_IMMUTABLE; unused */
inode->i_flags |= S_IMMUTABLE;
}
if (inode->u.ext2_i.i_flags & EXT2_NOATIME_FL) {
- inode->i_attr_flags |= ATTR_FLAG_NOATIME;
+ /* inode->i_attr_flags |= ATTR_FLAG_NOATIME; unused */
inode->i_flags |= S_NOATIME;
}
return;
@@ -1165,60 +1158,65 @@
return ext2_update_inode (inode, 1);
}

+#if 0 /* Currently unused */
int ext2_notify_change(struct dentry *dentry, struct iattr *iattr)
{
struct inode *inode = dentry->d_inode;
- int retval;
- unsigned int flags;
-
+ int retval;
+
+#if 0 /* Can currently only set attribute flags via ext2_ioctl */
retval = -EPERM;
- if (iattr->ia_valid & ATTR_ATTR_FLAG &&
- ((!(iattr->ia_attr_flags & ATTR_FLAG_APPEND) !=
- !(inode->u.ext2_i.i_flags & EXT2_APPEND_FL)) ||
- (!(iattr->ia_attr_flags & ATTR_FLAG_IMMUTABLE) !=
- !(inode->u.ext2_i.i_flags & EXT2_IMMUTABLE_FL)))) {
- if (!capable(CAP_LINUX_IMMUTABLE))
+ if (iattr->ia_valid & ATTR_ATTR_FLAG) {
+ if ((!(iattr->ia_attr_flags & ATTR_FLAG_APPEND) !=
+ !(inode->u.ext2_i.i_flags & EXT2_APPEND_FL)) ||
+ (!(iattr->ia_attr_flags & ATTR_FLAG_IMMUTABLE) !=
+ !(inode->u.ext2_i.i_flags & EXT2_IMMUTABLE_FL))))
+ if (!capable(CAP_LINUX_IMMUTABLE))
+ goto out;
+ if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
goto out;
- } else if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
- goto out;
-
+ }
+#endif
retval = inode_change_ok(inode, iattr);
if (retval != 0)
goto out;

- inode_setattr(inode, iattr);
-
- flags = iattr->ia_attr_flags;
- if (flags & ATTR_FLAG_SYNCRONOUS) {
- inode->i_flags |= S_SYNC;
- inode->u.ext2_i.i_flags |= EXT2_SYNC_FL;
- } else {
- inode->i_flags &= ~S_SYNC;
- inode->u.ext2_i.i_flags &= ~EXT2_SYNC_FL;
- }
- if (flags & ATTR_FLAG_NOATIME) {
- inode->i_flags |= S_NOATIME;
- inode->u.ext2_i.i_flags |= EXT2_NOATIME_FL;
- } else {
- inode->i_flags &= ~S_NOATIME;
- inode->u.ext2_i.i_flags &= ~EXT2_NOATIME_FL;
- }
- if (flags & ATTR_FLAG_APPEND) {
- inode->i_flags |= S_APPEND;
- inode->u.ext2_i.i_flags |= EXT2_APPEND_FL;
- } else {
- inode->i_flags &= ~S_APPEND;
- inode->u.ext2_i.i_flags &= ~EXT2_APPEND_FL;
- }
- if (flags & ATTR_FLAG_IMMUTABLE) {
- inode->i_flags |= S_IMMUTABLE;
- inode->u.ext2_i.i_flags |= EXT2_IMMUTABLE_FL;
- } else {
- inode->i_flags &= ~S_IMMUTABLE;
- inode->u.ext2_i.i_flags &= ~EXT2_IMMUTABLE_FL;
+#if 0 /* Can currently only set attribute flags via ext2_ioctl */
+ if (iattr->ia_valid & ATTR_ATTR_FLAG) {
+ unsigned int flags = iattr->ia_attr_flags;
+ if (flags & ATTR_FLAG_SYNCRONOUS) {
+ inode->i_flags |= S_SYNC;
+ inode->u.ext2_i.i_flags |= EXT2_SYNC_FL;
+ } else {
+ inode->i_flags &= ~S_SYNC;
+ inode->u.ext2_i.i_flags &= ~EXT2_SYNC_FL;
+ }
+ if (flags & ATTR_FLAG_NOATIME) {
+ inode->i_flags |= S_NOATIME;
+ inode->u.ext2_i.i_flags |= EXT2_NOATIME_FL;
+ } else {
+ inode->i_flags &= ~S_NOATIME;
+ inode->u.ext2_i.i_flags &= ~EXT2_NOATIME_FL;
+ }
+ if (flags & ATTR_FLAG_APPEND) {
+ inode->i_flags |= S_APPEND;
+ inode->u.ext2_i.i_flags |= EXT2_APPEND_FL;
+ } else {
+ inode->i_flags &= ~S_APPEND;
+ inode->u.ext2_i.i_flags &= ~EXT2_APPEND_FL;
+ }
+ if (flags & ATTR_FLAG_IMMUTABLE) {
+ inode->i_flags |= S_IMMUTABLE;
+ inode->u.ext2_i.i_flags |= EXT2_IMMUTABLE_FL;
+ } else {
+ inode->i_flags &= ~S_IMMUTABLE;
+ inode->u.ext2_i.i_flags &= ~EXT2_IMMUTABLE_FL;
+ }
}
- mark_inode_dirty(inode);
+#endif
+ inode_setattr(inode, iattr); /* This calls mark_inode_dirty for us */
out:
return retval;
}
+#endif

--
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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