> --- linux-2.6.orig/fs/attr.c 2008-05-06 11:04:29.000000000 +0200
> +++ linux-2.6/fs/attr.c 2008-05-06 11:04:35.000000000 +0200
> @@ -108,6 +108,12 @@ int notify_change(struct dentry * dentry
> struct timespec now;
> unsigned int ia_valid = attr->ia_valid;
>
> + if (ia_valid & (ATTR_MODE | ATTR_UID | ATTR_GID |
> + ATTR_ATIME_SET | ATTR_MTIME_SET)) {
> + if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
> + return -EPERM;
> + }
> +
> now = current_fs_time(inode->i_sb);
>
> attr->ia_ctime = now;
> Index: linux-2.6/fs/utimes.c
> ===================================================================
> --- linux-2.6.orig/fs/utimes.c 2008-05-06 11:04:29.000000000 +0200
> +++ linux-2.6/fs/utimes.c 2008-05-06 11:04:35.000000000 +0200
> @@ -105,10 +105,6 @@ long do_utimes(int dfd, char __user *fil
> /* Don't worry, the checks are done in inode_change_ok() */
> newattrs.ia_valid = ATTR_CTIME | ATTR_MTIME | ATTR_ATIME;
> if (times) {
> - error = -EPERM;
> - if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
> - goto mnt_drop_write_and_out;
> -
> if (times[0].tv_nsec == UTIME_OMIT)
> newattrs.ia_valid &= ~ATTR_ATIME;
> else if (times[0].tv_nsec != UTIME_NOW) {
Erm... What happens if we have UTIME_NOW on both and inode is marked
immutable? AFAICS, you've just switched from -EPERM to -EACCES.
For append-only it's even more interesting - you go from -EPERM to
success.
It might or might not be the right thing to do, and the syscall is
new, but... Do you have an ACK from Ulrich?
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