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xv6-cs450
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Merge branch 'master' of git+ssh://amsterdam.csail.mit.edu/home/am0/6.828/xv6

This commit is contained in:
Frans Kaashoek 2011-08-21 21:14:42 -04:00
parent 3682474f77 327cc21fba
commit 39f8cc56d3
2 changed files with 66 additions and 18 deletions
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31
fs.c
View File

@ -469,30 +469,25 @@ struct inode*
dirlookup(struct inode *dp, char *name, uint *poff)
{
uint off, inum;
struct buf *bp;
struct dirent *de;
struct dirent de;
if(dp->type != T_DIR)
panic("dirlookup not DIR");
for(off = 0; off < dp->size; off += BSIZE){
bp = bread(dp->dev, bmap(dp, off / BSIZE));
for(de = (struct dirent*)bp->data;
de < (struct dirent*)(bp->data + BSIZE);
de++){
if(de->inum == 0)
continue;
if(namecmp(name, de->name) == 0){
// entry matches path element
if(poff)
*poff = off + (uchar*)de - bp->data;
inum = de->inum;
brelse(bp);
return iget(dp->dev, inum);
}
for(off = 0; off < dp->size; off += sizeof(de)){
if(readi(dp, (char*)&de, off, sizeof(de)) != sizeof(de))
panic("dirlink read");
if(de.inum == 0)
continue;
if(namecmp(name, de.name) == 0){
// entry matches path element
if(poff)
*poff = off;
inum = de.inum;
return iget(dp->dev, inum);
}
brelse(bp);
}
return 0;
}

53
usertests.c
View File

@ -1529,6 +1529,59 @@ bigargtest(void)
wait();
}
// what happens when the file system runs out of blocks?
// answer: balloc panics, so this test is not useful.
void
fsfull()
{
int nfiles;
int fsblocks = 0;
printf(1, "fsfull test\n");
for(nfiles = 0; ; nfiles++){
char name[64];
name[0] = 'f';
name[1] = '0' + nfiles / 1000;
name[2] = '0' + (nfiles % 1000) / 100;
name[3] = '0' + (nfiles % 100) / 10;
name[4] = '0' + (nfiles % 10);
name[5] = '\0';
printf(1, "writing %s\n", name);
int fd = open(name, O_CREATE|O_RDWR);
if(fd < 0){
printf(1, "open %s failed\n", name);
break;
}
int total = 0;
while(1){
int cc = write(fd, buf, 512);
if(cc < 512)
break;
total += cc;
fsblocks++;
}
printf(1, "wrote %d bytes\n", total);
close(fd);
if(total == 0)
break;
}
while(nfiles >= 0){
char name[64];
name[0] = 'f';
name[1] = '0' + nfiles / 1000;
name[2] = '0' + (nfiles % 1000) / 100;
name[3] = '0' + (nfiles % 100) / 10;
name[4] = '0' + (nfiles % 10);
name[5] = '\0';
unlink(name);
nfiles--;
}
printf(1, "fsfull test finished\n");
}
int
main(int argc, char *argv[])
{