// update a file's manifest, in response to a remote call
// return 0 on success
// return -ENOENT if not found
// return -ESTALE if not local
// return -errno on error
// NOTE: the permissions will already have been checked by the server
static int UG_impl_manifest_patch( struct SG_gateway* gateway, struct SG_request_data* reqdat, struct SG_manifest* write_delta, void* cls ) {
int rc = 0;
int ref_rc = 0;
struct fskit_entry* fent = NULL;
struct UG_state* ug = (struct UG_state*)SG_gateway_cls( gateway );
struct fskit_core* fs = UG_state_fs( ug );
struct UG_inode* inode = NULL;
struct ms_client* ms = SG_gateway_ms( gateway );
uint64_t volume_id = ms_client_get_volume_id( ms );
rc = UG_consistency_path_ensure_fresh( gateway, reqdat->fs_path );
if( rc != 0 ) {
SG_error("UG_consistency_path_ensure_fresh('%s') rc = %d\n", reqdat->fs_path, rc );
return rc;
}
rc = UG_consistency_manifest_ensure_fresh( gateway, reqdat->fs_path );
if( rc != 0 ) {
SG_error("UG_consistency_manifest_ensure_fresh('%s') rc = %d\n", reqdat->fs_path, rc );
return rc;
}
// look up
fent = fskit_entry_resolve_path( fs, reqdat->fs_path, reqdat->user_id, volume_id, true, &rc );
if( fent == NULL ) {
return rc;
}
inode = (struct UG_inode*)fskit_entry_get_user_data( fent );
// must be coordinated by us
if( UG_inode_coordinator_id( inode ) != SG_gateway_id( gateway ) ) {
fskit_entry_unlock( fent );
return -ESTALE;
}
// update the manifest
fskit_entry_ref_entry( fent );
rc = UG_write_patch_manifest( gateway, reqdat, inode, write_delta );
fskit_entry_unlock( fent );
ref_rc = fskit_entry_unref( fs, reqdat->fs_path, fent );
if( ref_rc != 0 ) {
SG_warn("fskit_entry_unref('%s') rc = %d\n", reqdat->fs_path, rc );
}
return rc;
}
// sync: sync as usual
// NOTE: since this is backed by FUSE, this handler will only be called for regular files
int vdevfs_sync( struct fskit_core* core, struct fskit_match_group* grp, struct fskit_entry* fent ) {
void* user_data = fskit_entry_get_user_data( fent );
// careful...
int fd = 0;
memcpy( &fd, &user_data, 4 );
int rc = 0;
rc = fsync( fd );
if( rc < 0 ) {
rc = -errno;
vdev_error("fsync(%d '%s') rc = %d\n", fd, grp->path, rc );
return rc;
}
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;
}