// get the manifest mod time in its entirety
int fs_entry_get_manifest_mod_time( struct fs_core* core, char const* fs_path, struct timespec* t ) {
int err = 0;
struct fs_entry* fent = fs_entry_resolve_path( core, fs_path, SYS_USER, 0, false, &err );
if( !fent || err ) {
if( !err )
err = -ENOMEM;
return err;
}
if( fent->manifest == NULL ) {
errorf("BUG: %" PRIX64 " (%s) not initialized\n", fent->file_id, fent->name );
exit(1);
}
if( !fent->manifest->is_initialized() ) {
fs_entry_unlock( fent );
return -ENODATA;
}
fent->manifest->get_modtime( t );
fs_entry_unlock( fent );
return 0;
}
// get the gateway coordinator of a file
uint64_t fs_entry_get_block_host( struct fs_core* core, char* fs_path, uint64_t block_id ) {
int err = 0;
struct fs_entry* fent = fs_entry_resolve_path( core, fs_path, SYS_USER, 0, false, &err );
if( !fent || err ) {
if( !err )
err = -ENOMEM;
return err;
}
if( fent->manifest == NULL ) {
errorf("BUG: %" PRIX64 " (%s) not initialized\n", fent->file_id, fent->name );
exit(1);
}
if( !fent->manifest->is_initialized() ) {
fs_entry_unlock( fent );
return -ENODATA;
}
uint64_t ret = fent->manifest->get_block_host( core, block_id );
fs_entry_unlock( fent );
return ret;
}
// detach a file from the filesystem
// Only remove a directory if it is empty.
int fs_entry_detach( struct fs_core* core, char const* path, uint64_t user, uint64_t vol ) {
// resolve the parent of this child (and write-lock it)
char* path_dirname = md_dirname( path, NULL );
char* path_basename = md_basename( path, NULL );
int err = 0;
struct fs_entry* parent = fs_entry_resolve_path( core, path_dirname, user, vol, true, &err );
free( path_dirname );
if( parent == NULL ) {
free( path_basename );
return err;
}
if( parent->ftype != FTYPE_DIR ) {
// not a directory
fs_entry_unlock( parent );
free( path_basename );
return -ENOTDIR;
}
if( !IS_DIR_READABLE( parent->mode, parent->owner, parent->volume, user, vol ) ) {
// directory not searchable
fs_entry_unlock( parent );
free( path_basename );
return -EACCES;
}
// is parent writeable?
if( !IS_WRITEABLE( parent->mode, parent->owner, parent->volume, user, vol ) ) {
// nope
fs_entry_unlock( parent );
free( path_basename );
return -EACCES;
}
struct fs_entry* child = fs_entry_set_find_name( parent->children, path_basename );
free( path_basename );
if( child == NULL ) {
// doesn't exist
fs_entry_unlock( parent );
return -ENOENT;
}
int rc = fs_entry_detach_lowlevel( core, parent, child );
fs_entry_unlock( parent );
return rc;
}
// utime
int fs_entry_utime( struct fs_core* core, char const* path, struct utimbuf* tb, uint64_t user, uint64_t volume ) {
int err = 0;
uint64_t parent_id = 0;
char* parent_name = NULL;
struct fs_entry* fent = fs_entry_resolve_path_and_parent_info( core, path, user, volume, true, &err, &parent_id, &parent_name );
if( !fent || err ) {
if( !err )
err = -ENOMEM;
return err;
}
// check permissions
if( tb == NULL && !IS_WRITEABLE( fent->mode, fent->owner, fent->volume, user, volume ) ) {
fs_entry_unlock( fent );
return -EACCES;
}
if( tb != NULL && fent->owner != user ) {
fs_entry_unlock( fent );
return -EACCES;
}
if( tb != NULL ) {
fent->mtime_sec = tb->modtime;
fent->atime = tb->actime;
}
else {
struct timespec ts;
clock_gettime( CLOCK_REALTIME, &ts );
fent->mtime_sec = ts.tv_sec;
fent->mtime_nsec = ts.tv_nsec;
fent->atime = fent->mtime_sec;
}
fent->atime = currentTimeSeconds();
// post update
struct md_entry up;
fs_entry_to_md_entry( core, &up, fent, parent_id, parent_name );
int rc = ms_client_update( core->ms, &fent->write_nonce, &up );
if( rc != 0 ) {
errorf("ms_client_update(%s) rc = %d\n", path, rc );
}
md_entry_free( &up );
fs_entry_unlock( fent );
return rc;
}
// access
int fs_entry_access( struct fs_core* core, char const* path, int mode, uint64_t user, uint64_t volume ) {
// make sure this path exists
int err = 0;
struct fs_entry* fent = fs_entry_resolve_path( core, path, user, volume, false, &err );
if( !fent || err ) {
if( !err )
err = -ENOMEM;
return err;
}
// F_OK implicitly satisfied
if( (mode & R_OK) && !IS_READABLE( fent->mode, fent->owner, fent->volume, user, volume ) ) {
err = -EACCES;
}
else if( (mode & W_OK) && !IS_WRITEABLE( fent->mode, fent->owner, fent->volume, user, volume ) ) {
err = -EACCES;
}
else if( (mode & X_OK) && !IS_EXECUTABLE( fent->mode, fent->owner, fent->volume, user, volume ) ) {
err = -EACCES;
}
fs_entry_unlock( fent );
return err;
}
// statfs
int fs_entry_statfs( struct fs_core* core, char const* path, struct statvfs *statv, uint64_t user, uint64_t vol ) {
// make sure this path refers to a path in the FS
int err = 0;
struct fs_entry* fent = fs_entry_resolve_path( core, path, user, vol, false, &err );
if( !fent || err ) {
if( !err )
err = -ENOMEM;
return err;
}
uint64_t num_files = ms_client_get_num_files( core->ms );
// populate the statv struct
statv->f_bsize = core->blocking_factor;
statv->f_blocks = 0;
statv->f_bfree = 0;
statv->f_bavail = 0;
statv->f_files = num_files;
statv->f_ffree = 0;
statv->f_fsid = SYNDICATEFS_MAGIC;
statv->f_namemax = 256; // might as well keep it limited to what ext2/ext3/ext4 can handle
statv->f_frsize = 0;
statv->f_flag = ST_NODEV | ST_NOSUID;
fs_entry_unlock( fent );
return 0;
}
// fstat
int fs_entry_fstat( struct fs_core* core, struct fs_file_handle* fh, struct stat* sb ) {
int rc = fs_file_handle_rlock( fh );
if( rc != 0 ) {
errorf("fs_file_handle_rlock rc = %d\n", rc );
return -EBADF;
}
// revalidate
rc = fs_entry_revalidate_path( core, fh->volume, fh->path );
if( rc != 0 ) {
errorf("fs_entry_revalidate_path(%s) rc = %d\n", fh->path, rc );
fs_file_handle_unlock( fh );
if( rc == -ENOENT ) {
// file no longer exists
return -EBADF;
}
return -EREMOTEIO;
}
rc = fs_entry_rlock( fh->fent );
if( rc != 0 ) {
errorf("fs_entry_rlock rc = %d\n", rc );
fs_file_handle_unlock( fh );
return -EBADF;
}
fs_entry_do_stat( core, fh->fent, sb );
fs_entry_unlock( fh->fent );
fs_file_handle_unlock( fh );
return 0;
}
// get the parent and child nodes on create/open, checking permissions along the way
// write-lock the parent.
// do NOT touch the child
// if the child is not found, *child will be set to NULL
// return 0 on success
// return -ENOTDIR if a directory along the path wasn't a directory
// return -EACCES on permission error
int fs_entry_open_parent_and_child( struct fs_core* core, char const* path, uint64_t user, uint64_t vol, struct fs_entry** ret_parent, struct fs_entry** ret_child ) {
// resolve the parent of this child (and write-lock it)
int rc = 0;
char* path_dirname = md_dirname( path, NULL );
char* path_basename = md_basename( path, NULL );
struct fs_entry* parent = fs_entry_resolve_path( core, path_dirname, user, vol, true, &rc );
if( parent == NULL ) {
free( path_basename );
free( path_dirname );
return rc;
}
free( path_dirname );
if( parent->ftype != FTYPE_DIR ) {
// parent is not a directory
fs_entry_unlock( parent );
free( path_basename );
return -ENOTDIR;
}
// can parent be searched?
if( !IS_DIR_READABLE( parent->mode, parent->owner, parent->volume, user, vol ) ) {
// nope
fs_entry_unlock( parent );
free( path_basename );
return -EACCES;
}
// resolve the child
struct fs_entry* child = fs_entry_set_find_name( parent->children, path_basename );
free( path_basename );
*ret_parent = parent;
*ret_child = child;
return 0;
}
// open a directory, but fail-fast if we can't get path metadata
struct fs_dir_handle* fs_entry_opendir( struct fs_core* core, char const* fs_path, uint64_t user, uint64_t vol, int* err ) {
// ensure path ends in /
char path[PATH_MAX];
strcpy( path, fs_path );
md_sanitize_path( path );
int rc = fs_entry_revalidate_path( core, path );
if( rc != 0 ) {
SG_error("fs_entry_revalidate_path(%s) rc = %d\n", path, rc );
return NULL;
}
uint64_t parent_id = 0;
char* parent_name = NULL;
struct fs_entry* dir = fs_entry_resolve_path_and_parent_info( core, path, user, vol, true, err, &parent_id, &parent_name );
if( dir == NULL ) {
return NULL;
}
// make sure it's a directory
if( dir->ftype != FTYPE_DIR ) {
*err = -ENOTDIR;
fs_entry_unlock( dir );
return NULL;
}
// open this directory
dir->open_count++;
struct fs_dir_handle* dirh = fs_dir_handle_create( dir, path, parent_id, parent_name );
rc = fs_dir_handle_open( dirh );
if( rc != 0 ) {
fs_dir_handle_destroy( dirh );
free( dirh );
dirh = NULL;
*err = rc;
}
// release the directory
fs_entry_unlock( dir );
free( parent_name );
return dirh;
}
// revalidate on open (not create)
int fs_entry_open_revalidate( struct fs_core* core, char const* path, uint64_t user, uint64_t vol ) {
int rc = 0;
struct fs_entry* fent = NULL;
// see that the entry still exists
rc = fs_entry_revalidate_path( core, path );
if( rc != 0 ) {
SG_error("fs_entry_revalidate_path(%s) rc = %d\n", path, rc );
return rc;
}
// find the entry
fent = fs_entry_resolve_path( core, path, user, vol, true, &rc );
if( fent == NULL || rc != 0 ) {
SG_error("fs_entry_resolve_path(%s) rc = %d\n", path, rc );
return rc;
}
// temporarily mark this entry as referenced, so it won't be unlinked while we revalidate
fent->link_count++;
fs_entry_unlock( fent );
// revalidate the entry's path and manifest
rc = fs_entry_revalidate_metadata( core, path, fent, NULL );
fs_entry_wlock( fent );
fent->link_count--;
fs_entry_unlock( fent );
if( rc != 0 ) {
SG_error("fs_entry_revalidate_metadata(%s) rc = %d\n", path, rc );
}
return rc;
}
// get a file manifest as a string
char* fs_entry_get_manifest_str( struct fs_core* core, char* fs_path ) {
int err = 0;
struct fs_entry* fent = fs_entry_resolve_path( core, fs_path, SYS_USER, 0, false, &err );
if( !fent || err ) {
return NULL;
}
char* ret = fent->manifest->serialize_str();
fs_entry_unlock( fent );
return ret;
}
// is a file local?
bool fs_entry_is_local( struct fs_core* core, char const* path, uint64_t user, uint64_t volume, int* err ) {
struct fs_entry* fent = fs_entry_resolve_path( core, path, user, volume, false, err );
if( !fent || *err ) {
if( !*err )
*err = -ENOMEM;
return false;
}
bool rc = FS_ENTRY_LOCAL( core, fent );
fs_entry_unlock( fent );
return rc;
}
// get a file manifest as a serialized protobuf
ssize_t fs_entry_serialize_manifest( struct fs_core* core, char* fs_path, char** manifest_bits, bool sign ) {
int err = 0;
struct fs_entry* fent = fs_entry_resolve_path( core, fs_path, SYS_USER, 0, false, &err );
if( !fent || err ) {
*manifest_bits = NULL;
return err;
}
ssize_t ret = fs_entry_serialize_manifest( core, fent, manifest_bits, sign );
fs_entry_unlock( fent );
return ret;
}
// chmod
int fs_entry_chmod( struct fs_core* core, char const* path, uint64_t user, uint64_t volume, mode_t mode ) {
int err = 0;
uint64_t parent_id = 0;
char* parent_name = NULL;
struct fs_entry* fent = fs_entry_resolve_path_and_parent_info( core, path, user, volume, true, &err, &parent_id, &parent_name );
if( !fent || err ) {
if( !err )
err = -ENOMEM;
return err;
}
// can't chmod unless we own the file
if( fent->owner != user ) {
fs_entry_unlock( fent );
free( parent_name );
return -EPERM;
}
fent->mode = mode;
// post update
struct md_entry up;
fs_entry_to_md_entry( core, &up, fent, parent_id, parent_name );
int rc = ms_client_update( core->ms, &fent->write_nonce, &up );
if( rc != 0 ) {
errorf("ms_client_update(%s) rc = %d\n", path, rc );
}
md_entry_free( &up );
fs_entry_unlock( fent );
free( parent_name );
return rc;
}
// get the in-memory version of a file
int64_t fs_entry_get_version( struct fs_core* core, char const* fs_path ) {
int err = 0;
struct fs_entry* fent = fs_entry_resolve_path( core, fs_path, SYS_USER, 0, false, &err );
if( !fent || err ) {
if( !err )
err = -ENOMEM;
return err;
}
int64_t ret = fent->version;
fs_entry_unlock( fent );
return ret;
}
// set the mod time (at the nanosecond resolution)
int fs_entry_set_mod_time( struct fs_core* core, char const* fs_path, struct timespec* t ) {
int err = 0;
struct fs_entry* fent = fs_entry_resolve_path( core, fs_path, SYS_USER, 0, true, &err );
if( !fent || err ) {
if( !err )
err = -ENOMEM;
return err;
}
fent->mtime_sec = t->tv_sec;
fent->mtime_nsec = t->tv_nsec;
fs_entry_unlock( fent );
return 0;
}
// is this local? That is, is the block hosted here?
bool fs_entry_is_block_local( struct fs_core* core, char const* path, uint64_t user, uint64_t volume, uint64_t block_id ) {
int err = 0;
struct fs_entry* fent = fs_entry_resolve_path( core, path, user, volume, false, &err );
if( !fent || err ) {
if( !err )
err = -ENOMEM;
return err;
}
bool rc = fent->manifest->is_block_local( core, block_id );
fs_entry_unlock( fent );
return rc;
}
// get the actual creation time
// get the mod time in its entirety
int fs_entry_get_creation_time( struct fs_core* core, char const* fs_path, struct timespec* t ) {
int err = 0;
struct fs_entry* fent = fs_entry_resolve_path( core, fs_path, SYS_USER, 0, false, &err );
if( !fent || err ) {
if( !err )
err = -ENOMEM;
return err;
}
t->tv_sec = fent->ctime_sec;
t->tv_nsec = fent->ctime_nsec;
fs_entry_unlock( fent );
return 0;
}
// undo a local create
// parent and child must be write-locked
// this will unlock and free the child
int fs_entry_undo_create( struct fs_core* core, char const* path, struct fs_entry* parent, struct fs_entry* child ) {
// revert
child->link_count--;
child->open_count--;
if( child->open_count == 0 ) {
fs_entry_free_working_data( child );
}
fs_entry_unlock( child );
// NOTE: parent will still exist--we can't remove a non-empty directory
fs_entry_detach_lowlevel( core, parent, child );
return 0;
}
// stat
int fs_entry_stat_extended( struct fs_core* core, char const* path, struct stat* sb, bool* is_local, int64_t* version, uint64_t* coordinator_id, uint64_t user, uint64_t volume, bool revalidate ) {
int rc = 0;
if( revalidate ) {
// revalidate
rc = fs_entry_revalidate_path( core, volume, path );
if( rc != 0 ) {
errorf("fs_entry_revalidate_path(%s) rc = %d\n", path, rc );
return rc;
}
}
int err = 0;
struct fs_entry* fent = fs_entry_resolve_path( core, path, user, volume, false, &err );
if( !fent || err ) {
if( !err )
err = -ENOMEM;
return err;
}
memset( sb, 0, sizeof(struct stat) );
// have entry read-locked
fs_entry_do_stat( core, fent, sb );
if( is_local ) {
*is_local = FS_ENTRY_LOCAL( core, fent );
}
if( version ) {
*version = fent->version;
}
if( coordinator_id ) {
*coordinator_id = fent->coordinator;
}
fs_entry_unlock( fent );
return 0;
}
// attach a file to the filesystem (same as link())
// THIS METHOD ONLY UPDATES THE METADATA; IT DOES NOT TOUCH STABLE STORAGE
int fs_entry_attach( struct fs_core* core, struct fs_entry* fent, char const* path, uint64_t user, uint64_t vol ) {
// sanity check: path's basename should be fent's name
char* path_base = md_basename( path, NULL );
if( strcmp( fent->name, path_base ) != 0 ) {
free(path_base);
return -EINVAL; // invalid entry
}
free( path_base );
int err = 0;
char* dirname = md_dirname( path, NULL );
struct fs_entry* parent = fs_entry_resolve_path( core, dirname, user, vol, true, &err );
free( dirname );
if( parent == NULL ) {
return err;
}
err = 0;
fs_entry_wlock( fent );
if( !IS_DIR_READABLE( parent->mode, parent->owner, parent->volume, user, vol ) ) {
// directory not searchable
fs_entry_unlock( fent );
fs_entry_unlock( parent );
return -EACCES;
}
if( !IS_WRITEABLE( parent->mode, parent->owner, parent->volume, user, vol ) ) {
// not writable--cannot insert
fs_entry_unlock( fent );
fs_entry_unlock( parent );
return -EACCES;
}
if( fs_entry_set_find_name( parent->children, fent->name ) == NULL ) {
fs_entry_attach_lowlevel( core, parent, fent );
}
else {
err = -EEXIST;
}
fs_entry_unlock( fent );
fs_entry_unlock( parent );
return err;
}
// fstat, with directory
int fs_entry_fstat_dir( struct fs_core* core, struct fs_dir_handle* dh, struct stat* sb ) {
if( fs_dir_handle_rlock( dh ) != 0 ) {
return -EBADF;
}
// revalidate
int rc = fs_entry_revalidate_path( core, dh->volume, dh->path );
if( rc != 0 ) {
errorf("fs_entry_revalidate_path(%s) rc = %d\n", dh->path, rc );
fs_dir_handle_unlock( dh );
return -EREMOTEIO;
}
if( fs_entry_rlock( dh->dent ) != 0 ) {
fs_dir_handle_unlock( dh );
return -EBADF;
}
fs_entry_do_stat( core, dh->dent, sb );
fs_entry_unlock( dh->dent );
fs_dir_handle_unlock( dh );
return 0;
}
// remove a directory, if it is empty
int fs_entry_rmdir( struct fs_core* core, char const* path, uint64_t user, uint64_t volume ) {
if( core->gateway == GATEWAY_ANON ) {
errorf("%s", "Removing directories is forbidden for anonymous gateways\n");
return -EPERM;
}
// get some info about this directory first
int rc = 0;
char* fpath = strdup( path );
md_sanitize_path( fpath );
// revalidate this path
rc = fs_entry_revalidate_path( core, volume, fpath );
if( rc != 0 && rc != -ENOENT ) {
// consistency cannot be guaranteed
errorf("fs_entry_revalidate_path(%s) rc = %d\n", fpath, rc );
free( fpath );
return rc;
}
free( fpath );
int err = 0;
struct fs_entry* dent = fs_entry_resolve_path( core, path, user, volume, false, &err );
if( !dent || err ) {
return err;
}
if( dent->ftype != FTYPE_DIR ) {
fs_entry_unlock( dent );
return -ENOTDIR;
}
char* path_dirname = md_dirname( path, NULL );
struct fs_entry* parent = fs_entry_resolve_path( core, path_dirname, user, volume, true, &err );
free( path_dirname );
if( !parent || err ) {
fs_entry_unlock( dent );
return err;
}
// IS THE PARENT EMPTY?
if( fs_entry_set_count( dent->children ) > 2 ) {
// nope
fs_entry_unlock( dent );
fs_entry_unlock( parent );
return -ENOTEMPTY;
}
struct md_entry ent;
fs_entry_to_md_entry( core, &ent, dent, parent->file_id, parent->name );
// tell the MS that this directory should go away
rc = ms_client_delete( core->ms, &ent );
md_entry_free( &ent );
if( rc != 0 ) {
errorf( "ms_client_delete(%s) rc = %d\n", path, rc );
rc = -EREMOTEIO;
fs_entry_unlock( dent );
fs_entry_unlock( parent );
}
else {
fs_entry_unlock( dent );
// detach from the filesystem
rc = fs_entry_detach_lowlevel( core, parent, dent );
if( rc != 0 ) {
errorf("fs_entry_detach_lowlevel(%s) rc = %d\n", path, rc );
}
fs_entry_unlock( parent );
}
return rc;
}
// lowlevel unlink operation--given an fs_entry and the name of an entry
// parent must be write-locked!
// child must NOT be locked!
int fs_entry_detach_lowlevel( struct fs_core* core, struct fs_entry* parent, struct fs_entry* child ) {
if( parent == child ) {
// tried to detach .
return -ENOTEMPTY;
}
if( child == NULL ) {
// no entry found
return -ENOENT;
}
fs_entry_wlock( child );
if( child->link_count == 0 ) {
// child is invalid
fs_entry_unlock( child );
return -ENOENT;
}
// if the child is a directory, and it's not empty, then don't proceed
if( child->ftype == FTYPE_DIR && fs_entry_set_count( child->children ) > 2 ) {
// not empty
fs_entry_unlock( child );
return -ENOTEMPTY;
}
// unlink
fs_entry_set_remove( parent->children, child->name );
struct timespec ts;
clock_gettime( CLOCK_REALTIME, &ts );
parent->mtime_sec = ts.tv_sec;
parent->mtime_nsec = ts.tv_nsec;
int rc = 0;
if( child->open_count == 0 ) {
// evict blocks, if there is a file to begin with
if( child->ftype == FTYPE_FILE && child->file_id != 0 ) {
rc = md_cache_evict_file( core->cache, child->file_id, child->version );
if( rc == -ENOENT ) {
// not a problem
rc = 0;
}
}
if( rc == 0 ) {
fs_entry_destroy( child, false );
free( child );
child = NULL;
}
else {
fs_entry_unlock( child );
}
}
else {
fs_entry_unlock( child );
}
if( rc == 0 && child ) {
child->link_count = 0;
}
return rc;
}
// unlink a file from the filesystem
// pass -1 if the version is not known, or pass the known version to be unlinked
// return -EUCLEAN if we failed to garbage-collect, but needed to (i.e. a manifest was missing)
// return -EREMOTEIO for failure to revalidate metadata
// return -ESTALE if the given information is out of date
int fs_entry_versioned_unlink( struct fs_core* core, char const* path, uint64_t file_id, uint64_t coordinator_id, int64_t known_version, uint64_t owner, uint64_t volume, uint64_t gateway_id,
bool check_file_id_and_coordinator_id ) {
// can't modify state if anonymous
if( core->gateway == SG_GATEWAY_ANON ) {
SG_error("%s", "Writing is forbidden for anonymous gateways\n");
return -EPERM;
}
// get some info about this file first
int rc = 0;
int err = 0;
bool no_manifest = false;
// consistency check
err = fs_entry_revalidate_path( core, path );
if( err != 0 ) {
SG_error("fs_entry_revalidate_path(%s) rc = %d\n", path, err );
if( err == -ENOENT )
return -ENOENT;
return -EREMOTEIO;
}
// look up the parent
char* path_dirname = md_dirname( path, NULL );
char* path_basename = md_basename( path, NULL );
struct fs_entry* parent = fs_entry_resolve_path( core, path_dirname, owner, volume, true, &err );
free( path_dirname );
if( !parent || err ) {
free( path_basename );
return err;
}
if( parent->ftype != FTYPE_DIR ) {
fs_entry_unlock( parent );
free( path_basename );
return err;
}
// get the child
struct fs_entry* fent = fs_entry_set_find_name( parent->children, path_basename );
free( path_basename );
if( fent == NULL ) {
fs_entry_unlock( fent );
fs_entry_unlock( parent );
return -ENOENT;
}
fs_entry_wlock( fent );
bool local = FS_ENTRY_LOCAL( core, fent );
int64_t version = fent->version;
if( check_file_id_and_coordinator_id ) {
if( fent->file_id != file_id ) {
SG_error("Remote unlink to file %s ID %" PRIX64 ", expected %" PRIX64 "\n", path, file_id, fent->file_id );
fs_entry_unlock( fent );
fs_entry_unlock( parent );
return -ESTALE;
}
if( fent->coordinator != coordinator_id ) {
SG_error("Remote unlink to file %s coordinator %" PRIu64 ", expected %" PRIu64 "\n", path, coordinator_id, fent->coordinator );
fs_entry_unlock( fent );
fs_entry_unlock( parent );
return -ESTALE;
}
}
if( known_version > 0 && fent->version > 0 && fent->version != known_version ) {
SG_error("Remote unlink to file %s version %" PRId64 ", expected %" PRId64 "\n", path, known_version, fent->version );
fs_entry_unlock( fent );
fs_entry_unlock( parent );
return -ESTALE;
}
// make sure the manifest is fresh, so we delete every block
// only need to worry about this if file has > 0 size
if( fent->size > 0 ) {
// try to get it
err = fs_entry_revalidate_manifest( core, path, fent );
if( err != 0 ) {
SG_error( "fs_entry_revalidate_manifest(%s) rc = %d\n", path, err );
if( err == -ENOENT ) {
// continue without a manifest
no_manifest = true;
SG_error("WARN: no manifest found for %s %" PRIX64 ". Assuming data is already vacuumed.\n", path, fent->file_id );
}
else {
// some other problem
fs_entry_unlock( fent );
fs_entry_unlock( parent );
return err;
}
}
}
// tell the driver we're deleting
int driver_rc = driver_delete_file( core, core->closure, path, fent );
if( driver_rc != 0 ) {
SG_error("driver_delete_file(%s %" PRIX64 ") rc = %d\n", path, fent->file_id, driver_rc );
fs_entry_unlock( fent );
fs_entry_unlock( parent );
return driver_rc;
}
rc = 0;
if( !local ) {
// this is someone else's file; tell them to unlink
Serialization::WriteMsg* detach_request = new Serialization::WriteMsg();
fs_entry_init_write_message( detach_request, core, Serialization::WriteMsg::DETACH );
fs_entry_prepare_detach_message( detach_request, path, fent, version );
Serialization::WriteMsg* detach_ack = new Serialization::WriteMsg();
// send the write message, or become the coordinator
rc = fs_entry_send_write_or_coordinate( core, path, fent, detach_request, detach_ack );
if( rc < 0 ) {
SG_error( "fs_entry_send_write_or_coordinate(%s) rc = %d\n", path, rc );
}
else if( rc == 0 ) {
// successfully sent
if( detach_ack->type() != Serialization::WriteMsg::ACCEPTED ) {
if( detach_ack->type() == Serialization::WriteMsg::ERROR ) {
// could not detach on the remote end
SG_error( "remote unlink error = %d (%s)\n", detach_ack->errorcode(), detach_ack->errortxt().c_str() );
rc = detach_ack->errorcode();
}
else {
// unknown message
SG_error( "remote unlink invalid message %d\n", detach_ack->type() );
rc = -EIO;
}
}
}
else {
// we're now the coordinator.
local = true;
}
delete detach_ack;
delete detach_request;
}
if( local ) {
// we're responsible for this file
// mark the file as deleted, so it won't show up again in any listing
fent->deletion_in_progress = true;
// safe to unlock parent--it won't be empty (in a rmdir-able sense) until fent is fully garbage-collected, but fent won't be listed either
fs_entry_unlock( parent );
// garbage-collect, then unlink on the MS. Loop this until we succeed in unlinking on the MS (which can only happen
// once all of fent's data has been garbage-collected).
while( true ) {
if( !no_manifest ) {
// if we got the latest manifest, garbage-collect all writes on the file
rc = fs_entry_vacuumer_file( core, path, fent );
if( rc != 0 ) {
SG_error("fs_entry_vacuumer_vacuum_file( %s %" PRIX64 " ) rc = %d\n", path, fent->file_id, rc );
// failed to garbage-collect...need to un-delete fent
fent->deletion_in_progress = false;
fs_entry_unlock( fent );
return -EREMOTEIO;
}
}
// tell the metadata server we just unlinked
// preserve the entry information so we can issue a deletion
struct md_entry ent;
fs_entry_to_md_entry( core, &ent, fent, parent->file_id, parent->name );
rc = ms_client_delete( core->ms, &ent );
md_entry_free( &ent );
if( rc != 0 ) {
SG_error( "ms_client_delete(%s) rc = %d\n", path, rc );
if( rc == -EAGAIN ) {
if( !no_manifest ) {
// try vacuuming again--some write got added in between our garbage-collection and our unlink request
rc = 0;
continue;
}
else {
// there are un-garbage-collected writes, but we have no manifest, so we can't vacuum in order to proceed with the delete.
SG_error("MEMORY LEAK DETECTED: No manifest for %" PRIX64 " available; unable to vacuum!\n", fent->file_id );
// failed to garbage-collect...need to un-delete fent
fent->deletion_in_progress = false;
fs_entry_unlock( fent );
return -EUCLEAN;
}
}
else {
// something more serious
rc = -EREMOTEIO;
fent->deletion_in_progress = false;
fs_entry_unlock( fent );
return rc;
}
}
else {
// success!
break;
}
}
// re-lock the parent--it's guaranteed to exist, since it's not empty
fs_entry_wlock( parent );
// unlock fent--we're done with it
fs_entry_unlock( fent );
// detatch fent from parent
rc = fs_entry_detach_lowlevel( core, parent, fent );
if( rc != 0 ) {
SG_error("fs_entry_detach_lowlevel(%" PRIX64 ") rc = %d\n", fent->file_id, rc );
fs_entry_unlock( parent );
return rc;
}
fs_entry_unlock( parent );
}
return rc;
}
// make a node (regular files only at this time)
int fs_entry_mknod( struct fs_core* core, char const* path, mode_t mode, dev_t dev, uint64_t user, uint64_t vol ) {
// only regular files at this time...
if( ! ( S_ISREG( mode ) || S_ISFIFO( mode ) ) ) {
return -ENOTSUP;
}
// revalidate this path
int rc = fs_entry_revalidate_path( core, path );
if( rc != 0 && rc != -ENOENT ) {
// consistency cannot be guaranteed
SG_error("fs_entry_revalidate_path(%s) rc = %d\n", path, rc );
return rc;
}
int err = 0;
// get the parent directory and lock it
char* path_dirname = md_dirname( path, NULL );
struct fs_entry* parent = fs_entry_resolve_path( core, path_dirname, user, vol, true, &err );
free( path_dirname );
if( !IS_DIR_READABLE( parent->mode, parent->owner, parent->volume, user, vol ) ) {
// not searchable
fs_entry_unlock( parent );
return -EACCES;
}
if( !IS_WRITEABLE( parent->mode, parent->owner, parent->volume, user, vol ) ) {
// not writeable
fs_entry_unlock( parent );
return -EACCES;
}
uint64_t parent_id = parent->file_id;
char* parent_name = strdup( parent->name );
char* path_basename = md_basename( path, NULL );
// make sure it doesn't exist already (or isn't in the process of being deleted, since we might have to re-create it if deleting it fails)
if( fs_entry_set_find_name( parent->children, path_basename ) != NULL ) {
free( path_basename );
fs_entry_unlock( parent );
free( parent_name );
return -EEXIST;
}
struct fs_entry* child = (struct fs_entry*)calloc( sizeof(struct fs_entry), 1 );
struct timespec ts;
clock_gettime( CLOCK_REALTIME, &ts );
int mmode = 0;
if (S_ISFIFO(mode)) {
mmode = ( mode & 0777 ) | S_IFIFO;
err = fs_entry_init_fifo( core, child, path_basename, 0, fs_entry_next_file_version(), user, core->gateway, vol, mmode, 0, ts.tv_sec, ts.tv_nsec, 0, 0 );
}
if (S_ISREG(mode)) {
mmode = ( mode & 0777 );
err = fs_entry_init_file( core, child, path_basename, 0, fs_entry_next_file_version(), user, core->gateway, vol, mmode, 0, ts.tv_sec, ts.tv_nsec, 0, 0 );
}
if( err == 0 ) {
// mark it as created in this session
child->created_in_session = true;
// we're creating, so this manifest is initialized (to zero blocks)
child->manifest->initialize_empty( child->version );
fs_entry_wlock( child );
// call the driver
err = driver_create_file( core, core->closure, path, child );
if( err != 0 ) {
// undo
SG_error("driver_create_file(%s) rc = %d\n", path, err );
child->open_count = 0;
fs_entry_unlock( child );
fs_entry_destroy( child, false );
free( child );
}
else {
// attach the file
fs_entry_attach_lowlevel( core, parent, child );
struct md_entry data;
fs_entry_to_md_entry( core, &data, child, parent_id, parent_name );
// create the child on the MS, obtaining its file ID and write nonce
err = ms_client_create( core->ms, &child->file_id, &child->write_nonce, &data );
md_entry_free( &data );
if( err != 0 ) {
SG_error( "ms_client_create(%s) rc = %d\n", path, err );
err = -EREMOTEIO;
child->open_count = 0;
fs_entry_unlock( child );
fs_entry_detach_lowlevel( core, parent, child );
free( child );
}
else {
fs_entry_unlock( child );
}
}
}
fs_entry_unlock( parent );
free( parent_name );
free( path_basename );
return err;
}
// Try to open a file, but fail-fast on error. It behaves as close to POSIX-open as possible, with the following differences:
// * return -EREMOTEIO if the UG could not contact the MS, or if it could not obtain a fresh manifest.
// * return -EUCLEAN if the UG was unable to merge metadata from the MS into its metadata hierarchy (usually indicates a bug)
// * return a driver-specific, non-zero error code given by the driver's create_file() method
// Side-effects:
// * re-downloads and updates metadata for all entries along the path that are stale.
// * re-downloads the manifest for the i-node if it is stale.
struct fs_file_handle* fs_entry_open( struct fs_core* core, char const* _path, uint64_t user, uint64_t vol, int flags, mode_t mode, int* err ) {
// sanity check
if( (flags & O_RDONLY) == 0 && (flags & O_RDWR) != 0 && (flags & O_WRONLY) != 0 ) {
*err = -EINVAL;
return NULL;
}
if( (flags & O_RDONLY) != 0 && (flags & O_WRONLY) != 0 ) {
*err = -EINVAL;
return NULL;
}
// sanity check: check open mode vs whether or not we're a client and/or have read-only caps
if( core->gateway == SG_GATEWAY_ANON ) {
// no authentication; we're read-only
if( flags & (O_CREAT | O_RDWR | O_WRONLY | O_TRUNC | O_EXCL) ) {
SG_error("%s", "Opening to create, write, or truncate is forbidden for anonymous gateways\n");
*err = -EPERM;
return NULL;
}
}
int rc = 0;
char* parent_name = NULL;
uint64_t parent_id = 0;
struct fs_entry* child = NULL;
struct fs_entry* parent = NULL;
char const* reval_method = NULL;
struct fs_file_handle* ret = NULL;
// make sure path is sane
char* path = strdup(_path);
md_sanitize_path( path );
// revalidate metadata
if( flags & O_CREAT ) {
reval_method = "fs_entry_create_revalidate";
rc = fs_entry_create_revalidate( core, path, user, vol );
}
else {
reval_method = "fs_entry_open_revalidate";
rc = fs_entry_open_revalidate( core, path, user, vol );
}
if( rc != 0 ) {
SG_error("%s(%s) rc = %d\n", reval_method, path, rc );
*err = rc;
free( path );
return NULL;
}
// get the parent and child
// NOTE: parent will be write-locked; child will not be
rc = fs_entry_open_parent_and_child( core, path, user, vol, &parent, &child );
if( rc != 0 ) {
SG_error("fs_entry_open_parent_and_child( %s ) rc = %d\n", path, rc );
*err = rc;
free( path );
return NULL;
}
if( flags & O_CREAT ) {
// creating...
if( child != NULL ) {
// can't create--child exists
*err = -EEXIST;
free( path );
return NULL;
}
// carry out the local create
rc = fs_entry_do_create( core, path, parent, &child, user, vol, mode );
if( rc != 0 ) {
SG_error("fs_entry_do_create( %s ) rc = %d\n", path, rc );
*err = rc;
free( path );
return NULL;
}
// preserve these before unlocking, since we'll need them for the file handle
parent_id = parent->file_id;
parent_name = strdup( parent->name );
fs_entry_wlock( child );
fs_entry_unlock( parent );
// carry out the remote create
rc = fs_entry_do_MS_create( core, path, child, parent_id, parent_name );
if( rc != 0 ) {
SG_error("fs_entry_do_MS_create(%s) rc = %d\n", path, rc );
if( rc == -EAGAIN ) {
*err = rc;
}
else {
*err = -EREMOTEIO;
}
// NOTE: parent is guaranteed to exist, since child is attached to it and is write-locked (so it can't be unlinked)
fs_entry_wlock( parent );
fs_entry_undo_create( core, path, parent, child );
fs_entry_unlock( parent );
child = NULL;
free( path );
free( parent_name );
return NULL;
}
}
else {
// opening...
if( child == NULL ) {
fs_entry_unlock( parent );
// can't open--child doesn't exist
*err = -ENOENT;
free( path );
return NULL;
}
// preserve these before unlocking, since we'll need them for the file handle
parent_id = parent->file_id;
parent_name = strdup( parent->name );
fs_entry_wlock( child );
fs_entry_unlock( parent );
// carry out the open
rc = fs_entry_do_open( core, path, child, user, vol, flags );
if( rc != 0 ) {
fs_entry_unlock( child );
SG_error("fs_entry_do_open(%s) rc = %d\n", path, rc );
*err = rc;
free( path );
free( parent_name );
return NULL;
}
// if we're truncating, do so as well
if( flags & O_TRUNC ) {
rc = fs_entry_open_truncate( core, path, child, parent_id, parent_name );
if( rc != 0 ) {
fs_entry_unlock( child );
SG_error("fs_entry_open_truncate(%s) rc = %d\n", path, rc );
*err = rc;
free( path );
free( parent_name );
return NULL;
}
}
}
// success!
child->atime = md_current_time_seconds();
// give back a file handle
ret = fs_file_handle_create( core, child, path, parent_id, parent_name );
fs_file_handle_open( ret, flags, mode );
fs_entry_unlock( child );
free( path );
free( parent_name );
return ret;
}
// carry out the create locally.
// check permissions, initialize the child, and add it as a child of parent.
// return the initialized child (which will NOT be locked) via *ret_child
// return 0 on success
// return -EACCES on permission failure
// parent MUST be write locked
int fs_entry_do_create( struct fs_core* core, char const* path, struct fs_entry* parent, struct fs_entry** ret_child, uint64_t user, uint64_t vol, mode_t mode ) {
int rc = 0;
struct fs_entry* child = NULL;
if( !IS_WRITEABLE(parent->mode, parent->owner, parent->volume, user, vol) ) {
// can't create
return -EACCES;
}
else {
struct timespec ts;
clock_gettime( CLOCK_REALTIME, &ts );
// can create--initialize the child
child = SG_CALLOC( struct fs_entry, 1 );
char* path_basename = md_basename( path, NULL );
rc = fs_entry_init_file( core, child, path_basename, 0, fs_entry_next_file_version(), user, core->gateway, vol, mode, 0, ts.tv_sec, ts.tv_nsec, 0, 0 );
free( path_basename );
if( rc != 0 ) {
SG_error("fs_entry_init_file(%s) rc = %d\n", path, rc );
fs_entry_destroy( child, false );
free( child );
return rc;
}
else {
// mark it as created in this session
child->created_in_session = true;
// we're creating, so this manifest is initialized (to zero blocks)
child->manifest->initialize_empty( child->version );
// run the driver
int driver_rc = driver_create_file( core, core->closure, path, child );
if( driver_rc != 0 ) {
SG_error("driver_create_file(%s) rc = %d\n", path, driver_rc );
fs_entry_destroy( child, false );
free( child );
return driver_rc;
}
// insert it into the filesystem
fs_entry_wlock( child );
// open it
child->open_count++;
fs_entry_setup_working_data( core, child );
fs_entry_attach_lowlevel( core, parent, child );
fs_entry_unlock( child );
*ret_child = child;
}
}
return 0;
}
int main(int argc, char** argv) {
md_debug(1);
md_error(1);
SG_debug("%s\n", "starting up debugging");
SG_error("%s\n", "starting up errors");
int c;
char* config_file = (char*)CLIENT_DEFAULT_CONFIG;
int portnum = 0;
struct md_HTTP syndicate_http;
char* username = NULL;
char* password = NULL;
char* volume_name = NULL;
char* volume_secret = NULL;
char* ms_url = NULL;
int read_count = 1;
static struct option syndicate_options[] = {
{"config-file", required_argument, 0, 'c'},
{"volume-name", required_argument, 0, 'v'},
{"volume-secret", required_argument, 0, 's'},
{"username", required_argument, 0, 'u'},
{"password", required_argument, 0, 'p'},
{"port", required_argument, 0, 'P'},
{"MS", required_argument, 0, 'm'},
{"read-count", required_argument, 0, 'R'},
{0, 0, 0, 0}
};
int opt_index = 0;
while((c = getopt_long(argc, argv, "c:v:s:u:p:P:fm:R:", syndicate_options, &opt_index)) != -1) {
switch( c ) {
case 'R': {
read_count = strtol(optarg, NULL, 10);
break;
}
case 'v': {
volume_name = optarg;
break;
}
case 'c': {
config_file = optarg;
break;
}
case 's': {
volume_secret = optarg;
break;
}
case 'u': {
username = optarg;
break;
}
case 'p': {
password = optarg;
break;
}
case 'P': {
portnum = strtol(optarg, NULL, 10);
break;
}
case 'm': {
ms_url = optarg;
break;
}
default: {
break;
}
}
}
int rc = syndicate_init( config_file, &syndicate_http, portnum, ms_url, volume_name, volume_secret, username, password );
if( rc != 0 )
exit(1);
struct md_syndicate_conf* conf = syndicate_get_conf();
if( portnum == 0 )
portnum = conf->httpd_portnum;
struct syndicate_state* state = syndicate_get_state();
// synchronous everything
conf->default_write_freshness = 0;
conf->default_read_freshness = 0;
char file[PATH_MAX];
memset(file, 0, PATH_MAX);
strcpy( file, READ_FILE );
struct fs_file_handle* fh = NULL;
ssize_t nw = 0;
ssize_t file_size = conf->blocking_factor * 100;
char* buf = SG_CALLOC( char, file_size );
char fill = rand() % 26 + 'A';
memset( buf, fill, file_size );
struct timespec ts, ts2;
DATA_BLOCK("open");
SG_BEGIN_TIMING_DATA( ts );
// create the file
fh = fs_entry_open( state->core, file, NULL, conf->owner, conf->volume, O_SYNC | O_RDWR, 0666, &rc );
if( rc != 0 ) {
SG_error("fs_entry_open(%s) rc = %d\n", file, rc );
exit(1);
}
SG_END_TIMING_DATA( ts, ts2, "open + MS revalidate + manifest refresh" );
DATA_BLOCK("remote read miss");
// mark the file as stale
fs_entry_wlock( fh->fent );
fs_entry_mark_read_stale( fh->fent );
fs_entry_unlock( fh->fent );
char const* key = "remote read miss";
char const* hit = "remote read hit";
for( int i = 0; i < read_count; i++ ) {
// read the file
SG_BEGIN_TIMING_DATA( ts );
nw = fs_entry_read( state->core, fh, buf, file_size, 0 );
if( nw != file_size ) {
SG_error("fs_entry_read(%s) rc = %ld\n", file, nw );
exit(1);
}
SG_END_TIMING_DATA( ts, ts2, key );
key = hit;
char buf[100];
sprintf(buf, "remote read hit %d", i );
DATA_BLOCK(buf);
}
SG_BEGIN_TIMING_DATA( ts );
// close
rc = fs_entry_close( state->core, fh );
if( rc != 0 ) {
SG_error("fs_entry_close(%s) rc = %d\n", file, rc );
exit(1);
}
SG_END_TIMING_DATA( ts, ts2, "close" );
DATA_BLOCK("");
free( fh );
syndicate_destroy();
free( buf );
return 0;
}