1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
|
#include "lib9.h"
#include "logfs.h"
#include "local.h"
void
logfsfreeanddirtydatablockcheck(LogfsServer *server, long seq)
{
DataBlock *db;
u32int mask;
if(seq >= server->ndatablocks)
return;
db = server->datablock + seq;
if(db->block < 0)
return;
mask = db->dirty & db->free;
if(mask) {
u32int 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, u32int 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;
logfsflashaddr2spo(server, e->flashaddr, &blockindex, &page, &offset);
if(blockindex < server->ndatablocks && (db = server->datablock + blockindex)->block >= 0) {
int npages = ((offset + e->max - e->min) + (1 << ll->l2pagesize) - 1) >> ll->l2pagesize;
u32int 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;
}
|
