Imbus/xv6-riscv-kernel
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Dirt simple logging

Browse source 
Passes usertests and stressfs
Seems to recover correctly in a number of simple cases
This commit is contained in:
Frans Kaashoek 2011-07-27 20:35:46 -04:00
parent 97657d703f
commit 13a96baefc
11 changed files with 244 additions and 47 deletions
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12
fs.c
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@ -25,7 +25,7 @@
static void itrunc(struct inode*);
// Read the super block.
static void
void
readsb(int dev, struct superblock *sb)
{
struct buf *bp;
@ -65,7 +65,7 @@ balloc(uint dev)
m = 1 << (bi % 8);
if((bp->data[bi/8] & m) == 0){ // Is block free?
bp->data[bi/8] |= m; // Mark block in use on disk.
bwrite(bp);
log_write(bp);
brelse(bp);
return b + bi;
}
@ -92,7 +92,7 @@ bfree(int dev, uint b)
if((bp->data[bi/8] & m) == 0)
panic("freeing free block");
bp->data[bi/8] &= ~m; // Mark block free on disk.
bwrite(bp);
log_write(bp);
brelse(bp);
}
@ -159,7 +159,7 @@ ialloc(uint dev, short type)
if(dip->type == 0){ // a free inode
memset(dip, 0, sizeof(*dip));
dip->type = type;
bwrite(bp); // mark it allocated on the disk
log_write(bp); // mark it allocated on the disk
brelse(bp);
return iget(dev, inum);
}
@ -183,7 +183,7 @@ iupdate(struct inode *ip)
dip->nlink = ip->nlink;
dip->size = ip->size;
memmove(dip->addrs, ip->addrs, sizeof(ip->addrs));
bwrite(bp);
log_write(bp);
brelse(bp);
}
@ -339,7 +339,7 @@ bmap(struct inode *ip, uint bn)
a = (uint*)bp->data;
if((addr = a[bn]) == 0){
a[bn] = addr = balloc(ip->dev);
bwrite(bp);
log_write(bp);
}
brelse(bp);
return addr;