// stat an inode directly
// fill in the stat buffer, and call the user route
// NOTE: fent must NOT be locked, but it must be ref'ed
int fskit_fstat( struct fskit_core* core, char const* fs_path, struct fskit_entry* fent, struct stat* sb ) {
// fill in defaults
fskit_entry_rlock( fent );
fskit_entry_fstat( fent, sb );
fskit_entry_unlock( fent );
// route to user callback
int rc = fskit_do_user_stat( core, fs_path, fent, sb );
return rc;
}
// stat a file's block--build a manifest request, and set its mode
// return 0 on success
// return -ESTALE if the inode is not local
// return -ENOENT if we don't have it
// return -ENOMEM on OOM
// return -errno on error
static int UG_impl_stat_block( struct SG_gateway* gateway, struct SG_request_data* reqdat, struct SG_request_data* entity_info, mode_t* mode, void* cls ) {
int rc = 0;
struct UG_state* ug = (struct UG_state*)SG_gateway_cls( gateway );
int64_t block_version = 0;
UG_handle_t* fi = NULL;
struct fskit_entry* fent = NULL;
struct UG_inode* inode = NULL;
uint64_t file_id = 0;
int64_t file_version = 0;
int close_rc = 0;
fi = UG_open( ug, reqdat->fs_path, O_RDONLY, &rc );
if( fi == NULL ) {
SG_error("UG_open('%s') rc = %d\n", reqdat->fs_path, rc );
return rc;
}
fskit_file_handle_rlock( fi->fh );
fent = fskit_file_handle_get_entry( fi->fh );
if( fent == NULL ) {
SG_error("BUG: no entry for handle %p\n", fi->fh );
exit(1);
}
fskit_entry_rlock( fent );
inode = (struct UG_inode*)fskit_entry_get_user_data( fent );
if( inode == NULL ) {
SG_error("BUG: no inode for entry %p\n", fent );
exit(1);
}
if( UG_inode_coordinator_id( inode ) != SG_gateway_id( gateway ) ) {
// not ours
SG_error("Not the coordinator of '%s' (it is now %" PRIu64 ")\n", reqdat->fs_path, UG_inode_coordinator_id( inode ) );
fskit_entry_unlock( fent );
fskit_file_handle_unlock( fi->fh );
rc = UG_close( ug, fi );
if( rc != 0 ) {
SG_error("UG_close('%s') rc = %d\n", reqdat->fs_path, rc );
}
return rc;
}
file_id = UG_inode_file_id( inode );
file_version = UG_inode_file_version( inode );
if( mode != NULL ) {
*mode = fskit_entry_get_mode( fent );
}
if( entity_info != NULL ) {
rc = UG_getblockinfo( ug, reqdat->block_id, &block_version, NULL, fi );
}
fskit_entry_unlock( fent );
fskit_file_handle_unlock( fi->fh );
inode = NULL;
if( rc != 0 ) {
SG_error("UG_getblockinfo(%s[%" PRIu64 "]) rc = %d\n", reqdat->fs_path, reqdat->block_id, rc);
goto UG_impl_stat_block_out;
}
rc = SG_request_data_init_block( gateway, reqdat->fs_path, file_id, file_version, reqdat->block_id, block_version, entity_info );
if( rc != 0 ) {
SG_error("SG_request_data_init_block rc = %d\n", rc );
goto UG_impl_stat_block_out;
}
UG_impl_stat_block_out:
close_rc = UG_close( ug, fi );
if( close_rc != 0 ) {
SG_error("UG_close('%s') rc = %d\n", reqdat->fs_path, close_rc );
}
return rc;
}
// readdir: equivocate about which devices exist, depending on who's asking
// omit entries if the ACLs forbid them
int vdevfs_readdir( struct fskit_core* core, struct fskit_match_group* grp, struct fskit_entry* fent, struct fskit_dir_entry** dirents, size_t num_dirents ) {
int rc = 0;
struct fskit_entry* child = NULL;
// entries to omit in the listing
vector<int> omitted_idx;
pid_t pid = 0;
uid_t uid = 0;
gid_t gid = 0;
struct vdevfs* vdev = (struct vdevfs*)fskit_core_get_user_data( core );
struct fskit_fuse_state* fs_state = fskit_fuse_get_state();
struct stat sb;
struct pstat ps;
char* child_path = NULL;
pid = fskit_fuse_get_pid();
uid = fskit_fuse_get_uid( fs_state );
gid = fskit_fuse_get_gid( fs_state );
vdev_debug("vdevfs_readdir(%s, %zu) from user %d group %d task %d\n", grp->path, num_dirents, uid, gid, pid );
// see who's asking
rc = pstat( pid, &ps, 0 );
if( rc != 0 ) {
vdev_error("pstat(%d) rc = %d\n", pid, rc );
return -EIO;
}
for( unsigned int i = 0; i < num_dirents; i++ ) {
// skip . and ..
if( strcmp(dirents[i]->name, ".") == 0 || strcmp(dirents[i]->name, "..") == 0 ) {
continue;
}
// find the associated fskit_entry
child = fskit_dir_find_by_name( fent, dirents[i]->name );
if( child == NULL ) {
// strange, shouldn't happen...
continue;
}
fskit_entry_rlock( child );
// construct a stat buffer from what we actually need
memset( &sb, 0, sizeof(struct stat) );
sb.st_uid = child->owner;
sb.st_gid = child->group;
sb.st_mode = fskit_fullmode( child->type, child->mode );
child_path = fskit_fullpath( grp->path, child->name, NULL );
if( child_path == NULL ) {
// can't continue; OOM
fskit_entry_unlock( child );
rc = -ENOMEM;
break;
}
// filter it
rc = vdev_acl_apply_all( vdev->config, vdev->acls, vdev->num_acls, child_path, &ps, uid, gid, &sb );
if( rc < 0 ) {
vdev_error("vdev_acl_apply_all('%s', uid=%d, gid=%d, pid=%d) rc = %d\n", child_path, uid, gid, pid, rc );
rc = -EIO;
}
else if( rc == 0 || (sb.st_mode & 0777) == 0 ) {
// omit this one
vdev_debug("Filter '%s'\n", child->name );
omitted_idx.push_back( i );
rc = 0;
}
else {
// success; matched
rc = 0;
}
fskit_entry_unlock( child );
free( child_path );
// error?
if( rc != 0 ) {
break;
}
}
// skip ACL'ed entries
for( unsigned int i = 0; i < omitted_idx.size(); i++ ) {
fskit_readdir_omit( dirents, omitted_idx[i] );
}
return rc;
}
