// this init's the library if it hasn't been done yet
bool
plfs_init()
{
static pthread_mutex_t confmutex = PTHREAD_MUTEX_INITIALIZER;
static PlfsConf *pconf = NULL;
bool ret = true;
if ( ! pconf ) { // not yet initialized. Try to do so.
pthread_mutex_lock(&confmutex); // who should initialize?
if (pconf) { // someone beat us in race. they will initialize.
ret = true;
} else { // we won race. we need to initialize.
LogMessage::init();
pconf = get_plfs_conf();
if ( !pconf ) {
ret = false; // something failed
} else {
ret = plfs_warm_path_resolution(pconf);
if ( !ret ) {
mlog(MLOG_WARN, "Unable to warm path resolution\n");
}
}
}
pthread_mutex_unlock(&confmutex);
}
return ret;
}
plfs_filetype
plfs_get_filetype(const char *path)
{
bool found = false;
PlfsConf *pconf = get_plfs_conf();
PlfsMount *pmount = find_mount_point(pconf, path, found);
return ((found && pmount) ? pmount->file_type : PFT_UNKNOWN);
}
/**
* ByteRangeIndex::index_add: add an index record to a writeable index
*
* @param cof the open file
* @param nbytes number of bytes we wrote
* @param offset the logical offset of the record
* @param pid the pid doing the writing
* @param physoffset the physical offset in the data dropping of the data
* @param begin the start timestamp
* @param end the end timestamp
* @return PLFS_SUCCESS or error code
*/
plfs_error_t
ByteRangeIndex::index_add(Container_OpenFile * /* cof */, size_t nbytes,
off_t offset, pid_t pid, off_t physoffset,
double begin, double end) {
plfs_error_t ret = PLFS_SUCCESS;
HostEntry newent;
Util::MutexLock(&this->bri_mutex, __FUNCTION__);
if (!this->isopen) { /* shouldn't be possible */
mlog(IDX_CRIT, "index_add: but not open?!");
ret = PLFS_EINVAL;
goto done;
}
/* attempt to extend a prev entry, if allowed */
if (get_plfs_conf()->compress_contiguous &&
!this->writebuf.empty() &&
this->writebuf.back().id == pid &&
this->writebuf.back().logical_offset +
(off_t)this->writebuf.back().length == offset) {
/* extend! */
this->writebuf.back().end_timestamp = end;
this->writebuf.back().length += nbytes;
} else {
/* add new entry! */
newent.logical_offset = offset;
newent.physical_offset = physoffset;
newent.length = nbytes;
newent.begin_timestamp = begin;
newent.end_timestamp = end;
newent.id = pid;
this->writebuf.push_back(newent);
}
this->write_count++;
this->write_bytes += nbytes;
this->eof_tracker = max(this->eof_tracker, offset + (off_t)nbytes);
/* XXX: carried over hardwired 1024 from old code */
if ((this->write_count % 1024) == 0) {
ret = this->flush_writebuf();
}
done:
Util::MutexUnlock(&this->bri_mutex, __FUNCTION__);
return(ret);
}
LogicalFileSystem *
plfs_get_logical_fs(const char *path)
{
mlog(PLFS_DBG, "ENTER %s: %s\n", __FUNCTION__,path);
bool found = false;
PlfsConf *pconf = get_plfs_conf();
PlfsMount *pmount = find_mount_point(pconf, path, found);
if (!found || pmount == NULL) {
return NULL;
}
return pmount->fs_ptr;
}
/*
* plfs_attach: attach a filesystem. must protect pmnt iostore data
* with a mutex.
*
* @param pmnt the mount to attach to
* @return PLFS_SUCCESS if attached, PLFS_E* on error
*/
plfs_error_t
plfs_attach(PlfsMount *pmnt) {
static pthread_mutex_t attachmutex = PTHREAD_MUTEX_INITIALIZER;
int lcv;
plfs_error_t rv = PLFS_SUCCESS;
pthread_mutex_lock(&attachmutex);
if (pmnt->attached) /* lost race, ok since someone else attached */
goto done;
{ /* begin: special case code for global_summary_dir */
PlfsConf *pconf = get_plfs_conf();
if (pconf->global_summary_dir != NULL &&
pconf->global_sum_io.store == NULL) {
/*
* XXX: this results in the bpath to the dir going in
* the global_sum_io.bmpoint string.
*/
if (plfs_iostore_factory(pmnt, &pconf->global_sum_io) != PLFS_SUCCESS) {
mlog(INT_WARN, "global_summary_dir %s: failed to attach!",
pconf->global_summary_dir);
} else if (!Util::isDirectory(pconf->global_sum_io.bmpoint.c_str(),
pconf->global_sum_io.store)) {
/* but keep it configured in, in case operator fixes it */
mlog(INT_WARN, "global_summary_dir %s is not a directory!",
pconf->global_summary_dir);
}
}
} /* end: special case code for global_summary_dir */
{ /* begin: special case code for statfs */
if (pmnt->statfs != NULL) {
if (plfs_iostore_factory(pmnt, &pmnt->statfs_io) != PLFS_SUCCESS) {
mlog(INT_WARN, "statfs %s: %s: failed to attach!",
pmnt->mnt_pt.c_str(), (*pmnt->statfs).c_str());
}
}
} /* end: special case code for statfs */
/* be careful about partly attached mounts */
for (lcv = 0 ; lcv < pmnt->nback && rv == PLFS_SUCCESS ; lcv++) {
if (pmnt->backends[lcv]->store != NULL)
continue; /* this one already done, should be ok */
rv = plfs_iostore_factory(pmnt, pmnt->backends[lcv]);
}
if (rv == PLFS_SUCCESS)
pmnt->attached = 1;
done:
pthread_mutex_unlock(&attachmutex);
return(rv);
}
/**
* plfs_phys_backlookup: lookup a physical path's backend info. the
* behavior of the search varies depending on bpathout. if bpathout
* is NULL, then we expect phys to be a backspec from a metalink and
* we look for an exact match on bmpoint. if bpathout is !NULL, then
* we expect the phys to contain a full physical path with a prefix,
* bmpoint, and bnode (so we need a front end match on bmpoint).
* bpathout will be NULL for Metalinks, non-NULL for Index chunk_map.
*
* @param phys the physical path string (from index, metalink, etc...)
* @param pmnt the logical mount to look in (if null: global search)
* @param backout where we place the result
* @param bpathout also put bpath here if !NULL
* @return PLFS_SUCCESS on success, PLFS_E* on failure
*/
plfs_error_t
plfs_phys_backlookup(const char *phys, PlfsMount *pmnt,
struct plfs_backend **backout, string *bpathout) {
const char *prefix;
int prelen;
plfs_error_t rv = PLFS_SUCCESS;
const char *bpath;
PlfsConf *pconf;
map<string,PlfsMount *>::iterator itr;
prefix = phys;
/* parse, w/special common shorthand cases */
if (prefix[0] == '/' || strcmp(prefix, "posix:") == 0) {
prelen = 0;
if (*prefix == 'p')
prefix = prefix + (sizeof("posix:") - 1);
bpath = prefix;
} else {
bpath = strstr(prefix, "://");
if (bpath)
bpath = strchr(bpath+(sizeof("://")-1), '/');
if (bpath == NULL) {
mlog(CON_INFO, "plfs_phys_backlookup: bad phys %s", phys);
return(PLFS_EINVAL);
}
prelen = bpath - prefix;
}
/* narrow the search if we can... */
if (pmnt) {
rv = plfs_phys_backlookup_mnt(prefix, prelen, bpath, pmnt,
backout, bpathout);
return(rv);
}
/* no mount provided, do a global search */
pconf = get_plfs_conf();
if (!pconf) {
mlog(CON_CRIT, "plfs_phys_backlookup: no config found");
return(PLFS_EINVAL);
}
for (itr = pconf->mnt_pts.begin() ; itr != pconf->mnt_pts.end() ; itr++) {
rv = plfs_phys_backlookup_mnt(prefix, prelen, bpath,
itr->second, backout, bpathout);
if (rv == PLFS_SUCCESS)
break;
}
return(rv);
}
/**
* find_best_mount_point: find the best matching mount point (e.g.
* choose /mnt/a/b/c over /mnt/a because it is a longer match).
*
* @param cleanlogical a cleaned version of the logical path
* @param mpp pointer to the mount we found
* @param mntlen length of the mount point string
* @return PLFS_SUCCESS or PLFS_E
*/
plfs_error_t
find_best_mount_point(const char *cleanlogical,
PlfsMount **mpp, int *mntlen) {
/*
* XXX: the old expandPath() used a static to cache the PlfsConf
* (prob to avoid the mutex lock in get_plfs_conf()). we
* replicate that here.
*/
static PlfsConf *pconf = get_plfs_conf();
map<string,PlfsMount *>::iterator itr;
PlfsMount *mymount, *xtry;
unsigned int hitlen;
plfs_error_t rv;
size_t xtrylen;
mymount = NULL;
hitlen = 0;
if (pconf == NULL)
goto done;
for (hitlen = 0, itr = pconf->mnt_pts.begin();
itr != pconf->mnt_pts.end(); itr++) {
xtry = itr->second;
xtrylen = xtry->mnt_pt.length();
if (hitlen > xtrylen) /* already found better match */
continue;
if (strncmp(cleanlogical, xtry->mnt_pt.c_str(), xtrylen) == 0 &&
(cleanlogical[xtrylen] == '\0' || cleanlogical[xtrylen] == '/')) {
mymount = xtry;
hitlen = xtrylen;
}
}
done:
if (mymount) {
/* make sure it is attached ... */
if (mymount->attached == 0) {
rv = plfs_attach(mymount);
if (rv != PLFS_SUCCESS)
return(rv);
}
*mpp = mymount;
*mntlen = hitlen;
return(PLFS_SUCCESS);
}
return(PLFS_ENOENT);
}
int
plfs_query(Plfs_fd *fd, size_t *writers, size_t *readers,
size_t *bytes_written, int *lazy_stat)
{
debug_enter(__FUNCTION__,fd->getPath());
bool reopen;
int ret = 0;
assert( fd != NULL);
ret = fd->query(writers, readers, bytes_written, &reopen);
if (lazy_stat) {
PlfsConf *pconf = get_plfs_conf();
*lazy_stat = pconf->lazy_stat && !reopen;
mlog(MLOG_DBG, "plfs_query lazy_stat: %d.\n", *lazy_stat);
}
debug_exit(__FUNCTION__,fd->getPath(),ret);
return ret;
}
bool
plfs_is_mnt_ancestor(const char *path){
// this might be the weird thing where user has path /mnt/plfs/file
// and they are calling container_access(/mnt)
// AND they are on a machine
// without FUSE and therefore /mnt doesn't actually exist
// calls to /mnt/plfs/file will be resolved by plfs because that is
// a virtual PLFS path that PLFS knows how to resolve but /mnt is
// not a virtual PLFS path. So the really correct thing to do
// would be to return a semantic error like EDEVICE which means
// cross-device error. But code team is a whiner who doesn't want
// to write code. So the second best thing to do is to check /mnt
// for whether it is a substring of any of our valid mount points
PlfsConf *pconf = get_plfs_conf();
map<string,PlfsMount *>::iterator itr;
bool match = true;
for(itr=pconf->mnt_pts.begin(); itr!=pconf->mnt_pts.end(); itr++) {
// ok, check to see if the request target matches a mount point
// can't just do a substring bec maybe a mount point is /mnt
// and they're asking for /m. So tokenize and compare tokens
string this_mnt = itr->first;
vector<string> mnt_tokens;
vector<string> target_tokens;
Util::tokenize(this_mnt,"/",mnt_tokens);
Util::tokenize(path,"/",target_tokens);
vector<string> token_itr;
match = true;
for(size_t i=0; i<target_tokens.size(); i++) {
if (i>=mnt_tokens.size()) {
break; // no good
}
mlog(INT_DCOMMON, "%s: compare %s and %s",
__FUNCTION__,mnt_tokens[i].c_str(),
target_tokens[i].c_str());
if (mnt_tokens[i]!=target_tokens[i]) {
match = false;
break;
}
}
if (match){
return true;
}
}
return false;
}
// returns PLFS_SUCCESS or PLFS_E*
plfs_error_t
plfs_dump_config(int check_dirs, int make_dir)
{
PlfsConf *pconf = get_plfs_conf();
static IOStore *fakestore = NULL;
int simple;
if ( ! pconf ) {
cerr << "FATAL no plfsrc file found.\n" << endl;
return PLFS_ENOENT;
}
if ( pconf->err_msg ) {
cerr << "FATAL conf file error: " << *(pconf->err_msg) << endl;
return PLFS_EINVAL;
}
/*
* if we make it here, we've parsed correctly. if we are checking
* dirs, then we need to attach to backends. in order to check
* the global_summary_dir (if enabled), we do a one-off attach
* here first. we also need a fake iostore to check local posix
* mount points (e.g. for FUSE, but it doesn't make sense for MPI
* or library access XXX).
*/
if (check_dirs) {
if (pconf->global_summary_dir) {
map<string,PlfsMount *>::iterator itr;
PlfsMount *pmnt;
itr = pconf->mnt_pts.begin();
/* note: get_plfs_conf() ensures there is at least 1 mnt */
pmnt = itr->second;
(void) plfs_attach(pmnt); /* ignore ret val */
}
/* XXX: generate a fake POSIX iostore, we'll never free it */
if (fakestore == NULL) {
char *pp, *bmp, spec[2];
int pl;
map<string,PlfsMount *>::iterator itr;
PlfsMount *pmnt;
itr = pconf->mnt_pts.begin();
/* note: get_plfs_conf() ensures there is at least 1 mnt */
pmnt = itr->second;
spec[0] = '/';
spec[1] = 0;
plfs_iostore_get(spec, &pp, &pl, &bmp, pmnt, &fakestore);
}
}
plfs_error_t ret = PLFS_SUCCESS;
cout << "Config file " << pconf->file << " correctly parsed:" << endl
<< "Num Hostdirs: " << pconf->num_hostdirs << endl
<< "Threadpool size: " << pconf->threadpool_size << endl
<< "Write index buffer size (mbs): " << pconf->buffer_mbs << endl
<< "Read index buffer size (mbs): " << pconf->read_buffer_mbs << endl
<< "Num Mountpoints: " << pconf->mnt_pts.size() << endl
<< "Lazy Stat: " << pconf->lazy_stat << endl
<< "Lazy Droppings: " << pconf->lazy_droppings << endl
<< "Compress Contiguous: " << pconf->compress_contiguous << endl
<< "Test Metalink: " << pconf->test_metalink << endl;
if (pconf->global_summary_dir) {
cout << "Global summary dir: " << pconf->global_summary_dir << endl;
if(check_dirs) {
ret = plfs_check_dir("global_summary_dir",
pconf->global_sum_io.prefix,
pconf->global_sum_io.store,
pconf->global_sum_io.bmpoint,ret,make_dir);
}
}
map<string,PlfsMount *>::iterator itr;
for(itr=pconf->mnt_pts.begin(); itr!=pconf->mnt_pts.end(); itr++) {
PlfsMount *pmnt = itr->second;
int check_dirs_now = check_dirs;
cout << "Mount Point " << itr->first << " :" << endl;
cout << "\tExpected Workload "
<< (pmnt->file_type == CONTAINER ? "shared_file (N-1)"
: pmnt->file_type == FLAT_FILE ? "file_per_proc (N-N)"
: pmnt->file_type == SMALL_FILE ? "small_file (1-N)"
: "UNKNOWN. WTF. email [email protected]")
<< endl;
if (check_dirs && plfs_attach(pmnt) != PLFS_SUCCESS) {
cout << "\tUnable to attach to mount point, disable check_dirs"
<< endl;
check_dirs_now = 0;
}
if(check_dirs_now && fakestore != NULL) {
ret = plfs_check_dir("mount_point","",
fakestore,itr->first,ret,make_dir);
}
simple = (pmnt->ncanback == pmnt->nback) &&
(pmnt->nshadowback == pmnt->nback);
if (simple) {
printf("\tBackends: total=%d (no restrictions)\n", pmnt->nback);
} else {
printf("\tBackends: canonical=%d, shadow=%d, total=%d\n",
pmnt->ncanback, pmnt->nshadowback, pmnt->nback);
}
ret = print_backends(pmnt, simple, check_dirs_now, ret, make_dir);
cout << "\tGlib buffer size (mbs): " << pmnt->glib_buffer_mbs << endl;
if(pmnt->syncer_ip) {
cout << "\tSyncer IP: " << pmnt->syncer_ip->c_str() << endl;
}
if(pmnt->statfs) {
cout << "\tStatfs: " << pmnt->statfs->c_str() << endl;
if(check_dirs_now && pmnt->statfs_io.store != NULL) {
ret=plfs_check_dir("statfs",pmnt->statfs_io.prefix,
pmnt->statfs_io.store,
pmnt->statfs->c_str(),ret,make_dir);
}
}
#ifdef USE_SMALLFILE
if (pmnt->file_type == SMALL_FILE) {
cout << "\tMax writers: " << pmnt->max_writers << endl;
cout << "\tMax cached smallfile containers: "
<< pmnt->max_smallfile_containers << endl;
}
#endif
cout << "\tChecksum: " << pmnt->checksum << endl;
}
return ret;
}
/**
* ByteRangeIndex::insert_entry: insert a single ContainerEntry in index
*
* @param idxout the index to insert the entry into
* @param add the entry to add
* @return PLFS_SUCCESS or error code
*/
plfs_error_t
ByteRangeIndex::insert_entry(map<off_t,ContainerEntry> &idxout,
off_t *eof_trk, off_t *bbytes,
ContainerEntry *add) {
pair<map<off_t,ContainerEntry>::iterator,bool> ret; /* for map insert */
bool overlap = false;
map<off_t,ContainerEntry>::iterator next, prev;
mlog(IDX_DAPI, "insert_entry: offset %ld into %p", add->logical_offset,
&idxout);
/* track metadata as we merge it in */
if (add->logical_offset + (off_t)add->length > *eof_trk) {
*eof_trk = add->logical_offset + add->length;
}
*bbytes += add->length;
/*
* ret.first is either us, or a prev defined dup key.
* ret.first can be idxout.begin() if it is the first entry (but
* it cannot be idxout.end(), since end is never a valid entry).
*/
ret = idxout.insert(pair<off_t,ContainerEntry>(add->logical_offset, *add));
next = ret.first;
next++;
prev = ret.first;
if (prev != idxout.begin()) { /* don't backup if already at begin */
prev--;
}
if (ret.second == false) { /* duplicate key! */
mlog(IDX_DAPI, "insert_entry: dup key %ld", add->logical_offset);
overlap = true;
} else {
/* check neighbors for overlap */
if (next != idxout.end() && add->overlap(next->second)) {
mlog(IDX_DAPI, "insert_entry: overlap next %ld -> %ld",
add->logical_offset, next->second.logical_offset);
overlap = true;
}
/* could be 'else if', but let's mlog if we overlap both ends */
if (ret.first != idxout.begin() && prev->second.overlap(*add)) {
mlog(IDX_DAPI, "insert_entry: overlap prev %ld -> %ld",
add->logical_offset, prev->second.logical_offset);
overlap = true;
}
}
/*
* if we have an overlap we need to fix it now.
*/
if (overlap) {
/* if new entry is zero length, we can just discard it now */
if (add->length == 0) {
if (ret.second) { /* if it got inserted, remove it */
idxout.erase(ret.first);
}
} else {
/* XXX: has a return value we ignore */
ByteRangeIndex::insert_overlapped(idxout, *add, ret);
}
} else if (get_plfs_conf()->compress_contiguous) {
/*
* if it abuts with the one before it, merge it in.
*/
if (ret.first != idxout.begin() && add->follows(prev->second)) {
mlog(IDX_DAPI, "insert_entry: merge %ld", add->logical_offset);
prev->second.length += add->length;
idxout.erase(ret.first);
}
}
return(PLFS_SUCCESS);
}
