void filter_setup_file_ops(struct filter_fs *cache, struct inode *inode, struct inode_operations *filter_iops, struct file_operations *filter_fops)
{
struct inode_operations *pr_iops;
struct inode_operations *cache_iops = inode->i_op;
struct file_operations *cache_fops = inode->i_fop;
FENTRY;
if ( cache->o_flags & FILTER_DID_FILE_OPS ) {
FEXIT;
return;
}
cache->o_flags |= FILTER_DID_FILE_OPS;
/* steal the old ops */
/* former ops become cache_ops */
cache->o_caops.cache_file_iops = cache_iops;
cache->o_caops.cache_file_fops = cache_fops;
/* abbreviate */
pr_iops = filter_c2ufiops(cache);
/* setup our dir iops: copy and modify */
memcpy(pr_iops, cache_iops, sizeof(*cache_iops));
/* copy dir fops */
CERROR("*** cache file ops at %p\n", cache_fops);
memcpy(filter_c2uffops(cache), cache_fops, sizeof(*cache_fops));
/* assign */
/* See comments above in filter_setup_dir_ops. SHP */
/*if (cache_iops->setattr)*/
pr_iops->setattr = filter_iops->setattr;
if (cache_iops->getattr)
pr_iops->getattr = filter_iops->getattr;
/* XXX Should this be conditional rmr ? */
pr_iops->permission = filter_iops->permission;
#ifdef CONFIG_FS_EXT_ATTR
/* For now we assume that posix acls are handled through extended
* attributes. If this is not the case, we must explicitly trap and
* posix_set_acl
*/
if (cache_iops->set_ext_attr && filter_iops->set_ext_attr)
pr_iops->set_ext_attr = filter_iops->set_ext_attr;
#endif
/* unconditional filtering operations */
filter_c2uffops(cache)->open = filter_fops->open;
filter_c2uffops(cache)->release = filter_fops->release;
filter_c2uffops(cache)->write = filter_fops->write;
filter_c2uffops(cache)->ioctl = filter_fops->ioctl;
FEXIT;
}
void presto_set_ops(struct inode *inode, struct filter_fs *filter)
{
ENTRY;
if (!inode || is_bad_inode(inode))
return;
if (inode->i_gid == presto_excluded_gid ) {
EXIT;
CDEBUG(D_INODE, "excluded methods for %ld at %p, %p\n",
inode->i_ino, inode->i_op, inode->i_fop);
return;
}
if (S_ISREG(inode->i_mode)) {
if ( !filter_c2cfiops(filter) ) {
filter_setup_file_ops(filter,
inode, &presto_file_iops,
&presto_file_fops);
}
inode->i_op = filter_c2ufiops(filter);
inode->i_fop = filter_c2uffops(filter);
CDEBUG(D_INODE, "set file methods for %ld to %p\n",
inode->i_ino, inode->i_op);
} else if (S_ISDIR(inode->i_mode)) {
inode->i_op = filter_c2udiops(filter);
inode->i_fop = filter_c2udfops(filter);
CDEBUG(D_INODE, "set dir methods for %ld to %p lookup %p\n",
inode->i_ino, inode->i_op, inode->i_op->lookup);
} else if (S_ISLNK(inode->i_mode)) {
if ( !filter_c2csiops(filter)) {
filter_setup_symlink_ops(filter,
inode,
&presto_sym_iops,
&presto_sym_fops);
}
inode->i_op = filter_c2usiops(filter);
inode->i_fop = filter_c2usfops(filter);
CDEBUG(D_INODE, "set link methods for %ld to %p\n",
inode->i_ino, inode->i_op);
}
EXIT;
}
