ref: 1018d7a7091fd5e0433f501a3474cdc3fec322cc
dir: /liblogfs/remove.c/
#include "logfsos.h" #include "logfs.h" #include "local.h" void logfsfreeanddirtydatablockcheck(LogfsServer *server, long seq) { DataBlock *db; Pageset mask, allpages; if(seq >= server->ndatablocks) return; db = server->datablock + seq; if(db->block < 0) return; mask = db->dirty & db->free; if(mask) { allpages = logfsdatapagemask(1 << server->ll->l2pagesperblock, 0); if((mask & allpages) == allpages) { //print("logfsfreedatapages: returning block to the wild\n"); logfsbootfettleblock(server->lb, db->block, LogfsTnone, ~0, nil); db->block = -1; if(seq == server->ndatablocks - 1) server->ndatablocks--; } } } void logfsfreedatapages(LogfsServer *server, long seq, Pageset mask) { DataBlock *db; if(seq >= server->ndatablocks) return; db = server->datablock + seq; if(db->block < 0) return; //print("logfsfreedatapages: index %ld mask 0x%.8ux\n", seq, mask); db->dirty |= mask; db->free |= mask; logfsfreeanddirtydatablockcheck(server, seq); } int logfsunconditionallymarkfreeanddirty(void *magic, Extent *e, int hole) { if(!hole && (e->flashaddr & LogAddr) == 0) { LogfsServer *server = magic; LogfsLowLevel *ll = server->ll; DataBlock *db; long blockindex; int page, offset, npages; Pageset mask; logfsflashaddr2spo(server, e->flashaddr, &blockindex, &page, &offset); if(blockindex < server->ndatablocks && (db = server->datablock + blockindex)->block >= 0) { npages = ((offset + e->max - e->min) + (1 << ll->l2pagesize) - 1) >> ll->l2pagesize; mask = logfsdatapagemask(npages, page); if((db->dirty & mask) != mask) print("markfreeandirty: not all pages dirty\n"); //print("markfreeanddirty: datablock %ld mask 0x%.8ux\n", blockindex, mask); logfsfreedatapages(server, blockindex, mask); } else print("markfreeanddirty: data block index %ld invalid\n", blockindex); } return 1; } char * logfsserverremove(LogfsServer *server, u32int fid) { Fid *f; char *errmsg; Entry *parent; Entry *e, **ep; ulong now; char *uid; LogMessage s; if(server->trace > 1) print("logfsserverremove(%ud)\n", fid); f = logfsfidmapfindentry(server->fidmap, fid); if(f == nil) { errmsg = logfsebadfid; goto clunk; } if((f->openmode & 3) == OWRITE) { errmsg = logfseaccess; goto clunk; } parent = f->entry->parent; if(parent == f->entry) { errmsg = Eperm; goto clunk; } if((parent->qid.type & QTDIR) == 0) { errmsg = logfseinternal; goto clunk; } if(!logfsuserpermcheck(server, parent, f, DMWRITE)) { errmsg = Eperm; goto clunk; } if((f->entry->qid.type & QTDIR) != 0 && f->entry->u.dir.list) { errmsg = logfsenotempty; goto clunk; } if(f->entry->deadandgone) { errmsg = Eio; goto clunk; } for(ep = &parent->u.dir.list; e = *ep; ep = &e->next) if(e == f->entry) break; if(e == nil) { errmsg = logfseinternal; goto clunk; } now = logfsnow(); uid = logfsisfindidfromname(server->is, f->uname); /* log it */ s.type = LogfsLogTremove; s.path = e->qid.path; s.u.remove.mtime = e->mtime; s.u.remove.muid = e->muid; errmsg = logfslog(server, 1, &s); if(errmsg) goto clunk; parent->mtime = now; parent->muid = uid; logfspathmapdeleteentry(server->pathmap, e->qid.path); *ep = e->next; /* so open can't find it */ e->deadandgone = 1; /* so that other fids don't work any more */ /* * lose the storage now, as deadandgone will prevent access */ if((e->qid.type & QTDIR) == 0) { logfsextentlistwalk(e->u.file.extent, logfsunconditionallymarkfreeanddirty, server); logfsextentlistfree(&e->u.file.extent); } e->inuse--; /* so that the entryclunk removes the storage */ errmsg = nil; clunk: logfsfidmapclunk(server->fidmap, fid); return errmsg; }