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xv6-cs450
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drop NADDRS and INDIRECT; too many names

This commit is contained in:
rsc 2009-05-31 00:59:37 +00:00
parent 030a47736f
commit ba6cd8a685
4 changed files with 13 additions and 15 deletions
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12
fs.c
View File

@ -335,10 +335,10 @@ bmap(struct inode *ip, uint bn, int alloc)
if(bn < NINDIRECT){
// Load indirect block, allocating if necessary.
if((addr = ip->addrs[INDIRECT]) == 0){
if((addr = ip->addrs[NDIRECT]) == 0){
if(!alloc)
return -1;
ip->addrs[INDIRECT] = addr = balloc(ip->dev);
ip->addrs[NDIRECT] = addr = balloc(ip->dev);
}
bp = bread(ip->dev, addr);
a = (uint*)bp->data;
@ -375,16 +375,16 @@ itrunc(struct inode *ip)
}
}
if(ip->addrs[INDIRECT]){
bp = bread(ip->dev, ip->addrs[INDIRECT]);
if(ip->addrs[NDIRECT]){
bp = bread(ip->dev, ip->addrs[NDIRECT]);
a = (uint*)bp->data;
for(j = 0; j < NINDIRECT; j++){
if(a[j])
bfree(ip->dev, a[j]);
}
brelse(bp);
bfree(ip->dev, ip->addrs[INDIRECT]);
ip->addrs[INDIRECT] = 0;
bfree(ip->dev, ip->addrs[NDIRECT]);
ip->addrs[NDIRECT] = 0;
}
ip->size = 0;

6
fs.h
View File

@ -15,11 +15,9 @@ struct superblock {
uint ninodes; // Number of inodes.
};
#define NADDRS (NDIRECT+1)
#define NDIRECT 12
#define INDIRECT 12
#define NINDIRECT (BSIZE / sizeof(uint))
#define MAXFILE (NDIRECT + NINDIRECT)
#define MAXFILE (NDIRECT + NINDIRECT)
// On-disk inode structure
struct dinode {
@ -28,7 +26,7 @@ struct dinode {
short minor; // Minor device number (T_DEV only)
short nlink; // Number of links to inode in file system
uint size; // Size of file (bytes)
uint addrs[NADDRS]; // Data block addresses
uint addrs[NDIRECT+1]; // Data block addresses
};
// Inodes per block.

2
fsvar.h
View File

@ -11,7 +11,7 @@ struct inode {
short minor;
short nlink;
uint size;
uint addrs[NADDRS];
uint addrs[NDIRECT+1];
};
#define I_BUSY 0x1

8
mkfs.c
View File

@ -259,17 +259,17 @@ iappend(uint inum, void *xp, int n)
}
x = xint(din.addrs[fbn]);
} else {
if(xint(din.addrs[INDIRECT]) == 0) {
if(xint(din.addrs[NDIRECT]) == 0) {
// printf("allocate indirect block\n");
din.addrs[INDIRECT] = xint(freeblock++);
din.addrs[NDIRECT] = xint(freeblock++);
usedblocks++;
}
// printf("read indirect block\n");
rsect(xint(din.addrs[INDIRECT]), (char*) indirect);
rsect(xint(din.addrs[NDIRECT]), (char*) indirect);
if(indirect[fbn - NDIRECT] == 0) {
indirect[fbn - NDIRECT] = xint(freeblock++);
usedblocks++;
wsect(xint(din.addrs[INDIRECT]), (char*) indirect);
wsect(xint(din.addrs[NDIRECT]), (char*) indirect);
}
x = xint(indirect[fbn-NDIRECT]);
}