On Mon 16-04-07 12:14:21, Andreas Dilger wrote:
> On Apr 16, 2007 19:05 +0200, Jan Kara wrote:
> > attached is a patch that stores inode flags such as S_IMMUTABLE,
> > S_APPEND, etc. from i_flags to EXT3_I(inode)->i_flags when inode is
> > written to disk. The same thing is done on GETFLAGS ioctl.
> > Quota code changes these flags on quota files (to make it harder for
> > sysadmin to screw himself) and these changes were not correctly
> > propagated into the filesystem (especially, lsattr did not show them and
> > users were wondering...).
> >
> > +/* Propagate flags from i_flags to EXT3_I(inode)->i_flags */
> > +void ext3_get_inode_flags(struct inode *inode)
> > +{
> > + unsigned int flags = inode->i_flags;
> > +
> > + EXT3_I(inode)->i_flags &= ~(EXT3_SYNC_FL|EXT3_APPEND_FL|
> > + EXT3_IMMUTABLE_FL|EXT3_NOATIME_FL|EXT3_DIRSYNC_FL);
> > + if (flags & S_SYNC)
> > + EXT3_I(inode)->i_flags |= EXT3_SYNC_FL;
> > + if (flags & S_APPEND)
> > + EXT3_I(inode)->i_flags |= EXT3_APPEND_FL;
> > + if (flags & S_IMMUTABLE)
> > + EXT3_I(inode)->i_flags |= EXT3_IMMUTABLE_FL;
> > + if (flags & S_NOATIME)
> > + EXT3_I(inode)->i_flags |= EXT3_NOATIME_FL;
> > + if (flags & S_DIRSYNC)
> > + EXT3_I(inode)->i_flags |= EXT3_DIRSYNC_FL;
> > +}
>
> It probably makes sense to pass "struct ext3_inode_info *ei" to this
> function, which is available at both callsites and avoids some pointer
> math for each access.
OK, makes sence. Will resend the patch in a while.
> > void ext3_read_inode(struct inode * inode)
> > {
> > struct ext3_iloc iloc;
> > @@ -2736,6 +2755,7 @@ static int ext3_do_update_inode(handle_t
> > if (ei->i_state & EXT3_STATE_NEW)
> > memset(raw_inode, 0, EXT3_SB(inode->i_sb)->s_inode_size);
> >
> > + ext3_get_inode_flags(inode);
> > raw_inode->i_mode = cpu_to_le16(inode->i_mode);
> > if(!(test_opt(inode->i_sb, NO_UID32))) {
> > raw_inode->i_uid_low = cpu_to_le16(low_16_bits(inode->i_uid));
> > diff -rupX /home/jack/.kerndiffexclude linux-2.6.21-rc6/fs/ext3/ioctl.c linux-2.6.21-rc6-1-ext3_flags_update/fs/ext3/ioctl.c
> > --- linux-2.6.21-rc6/fs/ext3/ioctl.c 2007-02-07 12:03:23.000000000 +0100
> > +++ linux-2.6.21-rc6-1-ext3_flags_update/fs/ext3/ioctl.c 2007-04-12 18:22:54.000000000 +0200
> > @@ -28,6 +28,7 @@ int ext3_ioctl (struct inode * inode, st
> >
> > switch (cmd) {
> > case EXT3_IOC_GETFLAGS:
> > + ext3_get_inode_flags(inode);
> > flags = ei->i_flags & EXT3_FL_USER_VISIBLE;
> > return put_user(flags, (int __user *) arg);
> > case EXT3_IOC_SETFLAGS: {
>
> Looks fine otherwise - there is already ext3_set_inode_flags() which sets the
> VFS inode flags properly in ext3_read_inode().
Yes, I know :).
Honza
--
Jan Kara <jack@xxxxxxx>
SuSE CR Labs
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