218 lines
4.4 KiB
C
218 lines
4.4 KiB
C
/* Copyright (c) 20XX 9front
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
* of this software and associated documentation files (the "Software"), to deal
|
|
* in the Software without restriction, including without limitation the rights
|
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
* copies of the Software, and to permit persons to whom the Software is
|
|
* furnished to do so, subject to the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be included in all
|
|
* copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
|
* SOFTWARE.
|
|
*/
|
|
#include <u.h>
|
|
#include <lib9.h>
|
|
#include <thread.h>
|
|
#include <9P2000.h>
|
|
#include "dat.h"
|
|
#include "fns.h"
|
|
|
|
int
|
|
copydentry(Fs *fs, FLoc *a, Loc *b, char *nname)
|
|
{
|
|
Buf *ba, *bb, *bc;
|
|
Dentry *d;
|
|
int i, rc;
|
|
FLoc c;
|
|
|
|
if(!namevalid(nname)){
|
|
werrstr(Einval);
|
|
return -1;
|
|
}
|
|
ba = getbuf(fs->d, a->blk, TDENTRY, 0);
|
|
if(ba == nil)
|
|
return -1;
|
|
bb = getbuf(fs->d, b->blk, TDENTRY, 0);
|
|
if(bb == nil){
|
|
putbuf(ba);
|
|
return -1;
|
|
}
|
|
rc = newentry(fs, b, bb, nname, &c, 1);
|
|
if(rc < 0){
|
|
err1:
|
|
putbuf(bb);
|
|
putbuf(ba);
|
|
return -1;
|
|
}
|
|
bc = getbuf(fs->d, c.blk, TDENTRY, 0);
|
|
if(bc == nil)
|
|
goto err1;
|
|
d = &bc->de[c.deind];
|
|
memcpy(d, &ba->de[a->deind], sizeof(*d));
|
|
strcpy(d->name, nname);
|
|
for(i = 0; i < NDIRECT; i++)
|
|
if(d->db[i] != 0)
|
|
chref(fs, d->db[i], 1);
|
|
for(i = 0; i < NINDIRECT; i++)
|
|
if(d->ib[i] != 0)
|
|
chref(fs, d->ib[i], 1);
|
|
bc->op |= BDELWRI;
|
|
putbuf(bc);
|
|
putbuf(bb);
|
|
putbuf(ba);
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
resetldumped(Fs *fs)
|
|
{
|
|
Loc *l;
|
|
|
|
for(l = fs->rootloc->gnext; l != fs->rootloc; l = l->gnext)
|
|
l->flags &= ~LDUMPED;
|
|
}
|
|
|
|
int
|
|
fsdump(Fs *fs)
|
|
{
|
|
char buf[20], *p, *e;
|
|
int n, rc;
|
|
Tm *tm;
|
|
Chan *ch, *chh;
|
|
Buf *b;
|
|
|
|
wlock(fs);
|
|
tm = localtime(time(0));
|
|
snprint(buf, sizeof(buf), "%.4d", tm->year + 1900);
|
|
ch = chanattach(fs, CHFNOLOCK|CHFDUMP);
|
|
ch->uid = -1;
|
|
if(ch == nil){
|
|
wunlock(fs);
|
|
return -1;
|
|
}
|
|
if(chanwalk(ch, buf) < 0){
|
|
chh = chanclone(ch);
|
|
rc = chancreat(chh, buf, DMDIR|0555, NP_OREAD);
|
|
chanclunk(chh);
|
|
if(rc < 0)
|
|
goto err;
|
|
if(chanwalk(ch, buf) < 0)
|
|
goto err;
|
|
}
|
|
b = getbuf(fs->d, ch->loc->blk, TDENTRY, 0);
|
|
if(b == nil)
|
|
goto err;
|
|
for(n = 0; ; n++){
|
|
e = buf + sizeof(buf);
|
|
p = seprint(buf, e, "%.2d%.2d", tm->mon + 1, tm->mday);
|
|
if(n > 0)
|
|
seprint(p, e, "%d", n);
|
|
rc = findentry(fs, ch->loc, b, buf, nil, 1);
|
|
if(rc < 0)
|
|
goto err;
|
|
if(rc == 0)
|
|
break;
|
|
}
|
|
putbuf(b);
|
|
rc = copydentry(fs, fs->rootloc, ch->loc, buf);
|
|
chanclunk(ch);
|
|
resetldumped(fs);
|
|
wunlock(fs);
|
|
return rc;
|
|
err:
|
|
chanclunk(ch);
|
|
wunlock(fs);
|
|
return -1;
|
|
}
|
|
|
|
int
|
|
willmodify(Fs *fs, Loc *l, int nolock)
|
|
{
|
|
Buf *p;
|
|
Loc *m;
|
|
uint64_t i, r;
|
|
Dentry *d;
|
|
int rc;
|
|
|
|
if((l->flags & LDUMPED) != 0)
|
|
return 1;
|
|
if(!nolock){
|
|
again:
|
|
runlock(fs);
|
|
wlock(fs);
|
|
}
|
|
if(l->next != nil && willmodify(fs, l->next, 1) < 0)
|
|
goto err;
|
|
rc = chref(fs, l->blk, 0);
|
|
if(rc < 0)
|
|
goto err;
|
|
if(rc == 0){
|
|
dprint("willmodify: block %lld has refcount 0\n", l->blk);
|
|
werrstr("phase error -- willmodify");
|
|
goto err;
|
|
}
|
|
if(rc == 1)
|
|
goto done;
|
|
|
|
p = getbuf(fs->d, l->next->blk, TDENTRY, 0);
|
|
if(p == nil)
|
|
goto err;
|
|
d = getdent(l->next, p);
|
|
if(d != nil) for(i = 0; i < d->size; i++){
|
|
rc = getblk(fs, l->next, p, i, &r, GBREAD);
|
|
if(rc <= 0)
|
|
continue;
|
|
if(r == l->blk)
|
|
goto found;
|
|
}
|
|
phase:
|
|
werrstr("willmodify -- phase error");
|
|
putbuf(p);
|
|
goto err;
|
|
found:
|
|
rc = getblk(fs, l->next, p, i, &r, GBWRITE);
|
|
if(rc < 0){
|
|
putbuf(p);
|
|
goto err;
|
|
}
|
|
if(rc == 0)
|
|
goto phase;
|
|
putbuf(p);
|
|
|
|
if(r != l->blk){
|
|
/*
|
|
* block got dumped, update the loctree so locs
|
|
* point to the new block.
|
|
*/
|
|
qlock(&fs->loctree);
|
|
for(m = l->cnext; m != l; m = m->cnext)
|
|
if(m->blk == l->blk)
|
|
m->blk = r;
|
|
l->blk = r;
|
|
qunlock(&fs->loctree);
|
|
}
|
|
done:
|
|
l->flags |= LDUMPED;
|
|
if(!nolock){
|
|
wunlock(fs);
|
|
rlock(fs);
|
|
if(chref(fs, l->blk, 0) != 1)
|
|
goto again;
|
|
}
|
|
return 0;
|
|
err:
|
|
if(!nolock){
|
|
wunlock(fs);
|
|
rlock(fs);
|
|
}
|
|
return -1;
|
|
}
|