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;
}
void filter_setup_dir_ops(struct filter_fs *cache, struct inode *inode, struct inode_operations *filter_iops, struct file_operations *filter_fops)
{
struct inode_operations *cache_filter_iops;
struct inode_operations *cache_iops = inode->i_op;
struct file_operations *cache_fops = inode->i_fop;
FENTRY;
if ( cache->o_flags & FILTER_DID_DIR_OPS ) {
FEXIT;
return;
}
cache->o_flags |= FILTER_DID_DIR_OPS;
/* former ops become cache_ops */
cache->o_caops.cache_dir_iops = cache_iops;
cache->o_caops.cache_dir_fops = cache_fops;
FDEBUG(D_SUPER, "filter at %p, cache iops %p, iops %p\n",
cache, cache_iops, filter_c2udiops(cache));
/* setup our dir iops: copy and modify */
memcpy(filter_c2udiops(cache), cache_iops, sizeof(*cache_iops));
/* abbreviate */
cache_filter_iops = filter_c2udiops(cache);
/* methods that filter if cache filesystem has these ops */
if (cache_iops->lookup && filter_iops->lookup)
cache_filter_iops->lookup = filter_iops->lookup;
if (cache_iops->create && filter_iops->create)
cache_filter_iops->create = filter_iops->create;
if (cache_iops->link && filter_iops->link)
cache_filter_iops->link = filter_iops->link;
if (cache_iops->unlink && filter_iops->unlink)
cache_filter_iops->unlink = filter_iops->unlink;
if (cache_iops->mkdir && filter_iops->mkdir)
cache_filter_iops->mkdir = filter_iops->mkdir;
if (cache_iops->rmdir && filter_iops->rmdir)
cache_filter_iops->rmdir = filter_iops->rmdir;
if (cache_iops->symlink && filter_iops->symlink)
cache_filter_iops->symlink = filter_iops->symlink;
if (cache_iops->rename && filter_iops->rename)
cache_filter_iops->rename = filter_iops->rename;
if (cache_iops->mknod && filter_iops->mknod)
cache_filter_iops->mknod = filter_iops->mknod;
if (cache_iops->permission && filter_iops->permission)
cache_filter_iops->permission = filter_iops->permission;
if (cache_iops->getattr)
cache_filter_iops->getattr = filter_iops->getattr;
/* Some filesystems do not use a setattr method of their own
instead relying on inode_setattr/write_inode. We still need to
journal these so we make setattr an unconditional operation.
XXX: we should probably check for write_inode. SHP
*/
/*if (cache_iops->setattr)*/
cache_filter_iops->setattr = filter_iops->setattr;
#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
* posix_set_acl. SHP
*/
if (cache_iops->set_ext_attr && filter_iops->set_ext_attr)
cache_filter_iops->set_ext_attr = filter_iops->set_ext_attr;
#endif
/* copy dir fops */
memcpy(filter_c2udfops(cache), cache_fops, sizeof(*cache_fops));
/* unconditional filtering operations */
filter_c2udfops(cache)->ioctl = filter_fops->ioctl;
FEXIT;
}
/* We always need to remove the presto options before passing
mount options to cache FS */
struct super_block * presto_read_super(struct super_block * sb,
void * data, int silent)
{
struct file_system_type *fstype;
struct presto_cache *cache = NULL;
char *cache_data = NULL;
char *cache_data_end;
char *cache_type = NULL;
char *fileset = NULL;
char *channel = NULL;
int err;
unsigned int minor;
ENTRY;
/* reserve space for the cache's data */
PRESTO_ALLOC(cache_data, PAGE_SIZE);
if ( !cache_data ) {
CERROR("presto_read_super: Cannot allocate data page.\n");
EXIT;
goto out_err;
}
/* read and validate options */
cache_data_end = presto_options(sb, data, cache_data, &cache_type,
&fileset, &channel);
/* was there anything for the cache filesystem in the data? */
if (cache_data_end == cache_data) {
PRESTO_FREE(cache_data, PAGE_SIZE);
cache_data = NULL;
} else {
CDEBUG(D_SUPER, "cache_data at %p is: %s\n", cache_data,
cache_data);
}
/* set up the cache */
cache = presto_cache_init();
if ( !cache ) {
CERROR("presto_read_super: failure allocating cache.\n");
EXIT;
goto out_err;
}
cache->cache_type = cache_type;
/* link cache to channel */
minor = presto_set_channel(cache, channel);
if (minor < 0) {
EXIT;
goto out_err;
}
CDEBUG(D_SUPER, "Presto: type=%s, fset=%s, dev= %d, flags %x\n",
cache_type, fileset?fileset:"NULL", minor, cache->cache_flags);
MOD_INC_USE_COUNT;
/* get the filter for the cache */
fstype = get_fs_type(cache_type);
cache->cache_filter = filter_get_filter_fs((const char *)cache_type);
if ( !fstype || !cache->cache_filter) {
CERROR("Presto: unrecognized fs type or cache type\n");
MOD_DEC_USE_COUNT;
EXIT;
goto out_err;
}
/* can we in fact mount the cache */
if ((fstype->fs_flags & FS_REQUIRES_DEV) && !sb->s_bdev) {
CERROR("filesystem \"%s\" requires a valid block device\n",
cache_type);
MOD_DEC_USE_COUNT;
EXIT;
goto out_err;
}
sb = fstype->read_super(sb, cache_data, silent);
/* this might have been freed above */
if (cache_data) {
PRESTO_FREE(cache_data, PAGE_SIZE);
cache_data = NULL;
}
if ( !sb ) {
CERROR("InterMezzo: cache mount failure.\n");
MOD_DEC_USE_COUNT;
EXIT;
goto out_err;
}
cache->cache_sb = sb;
cache->cache_root = dget(sb->s_root);
/* we now know the dev of the cache: hash the cache */
presto_cache_add(cache, sb->s_dev);
err = izo_prepare_fileset(sb->s_root, fileset);
filter_setup_journal_ops(cache->cache_filter, cache->cache_type);
/* make sure we have our own super operations: sb
still contains the cache operations */
filter_setup_super_ops(cache->cache_filter, sb->s_op,
&presto_super_ops);
sb->s_op = filter_c2usops(cache->cache_filter);
/* get izo directory operations: sb->s_root->d_inode exists now */
filter_setup_dir_ops(cache->cache_filter, sb->s_root->d_inode,
&presto_dir_iops, &presto_dir_fops);
filter_setup_dentry_ops(cache->cache_filter, sb->s_root->d_op,
&presto_dentry_ops);
sb->s_root->d_inode->i_op = filter_c2udiops(cache->cache_filter);
sb->s_root->d_inode->i_fop = filter_c2udfops(cache->cache_filter);
sb->s_root->d_op = filter_c2udops(cache->cache_filter);
EXIT;
return sb;
out_err:
CDEBUG(D_SUPER, "out_err called\n");
if (cache)
PRESTO_FREE(cache, sizeof(struct presto_cache));
if (cache_data)
PRESTO_FREE(cache_data, PAGE_SIZE);
if (fileset)
PRESTO_FREE(fileset, strlen(fileset) + 1);
if (channel)
PRESTO_FREE(channel, strlen(channel) + 1);
if (cache_type)
PRESTO_FREE(cache_type, strlen(cache_type) + 1);
CDEBUG(D_MALLOC, "mount error exit: kmem %ld, vmem %ld\n",
presto_kmemory, presto_vmemory);
return NULL;
}
