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提交 ba6cd8a6 创建 作者: rsc's avatar rsc
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drop NADDRS and INDIRECT; too many names

上级 030a4773
显示空白字符变更
内嵌 并排
正在显示 包含 12 行增加 和 14 行删除
fs.c
浏览文件 @ ba6cd8a6
...@@ -335,10 +335,10 @@ bmap(struct inode *ip, uint bn, int alloc) ...@@ -335,10 +335,10 @@ bmap(struct inode *ip, uint bn, int alloc)
if(bn < NINDIRECT){ if(bn < NINDIRECT){
// Load indirect block, allocating if necessary. // Load indirect block, allocating if necessary.
if((addr = ip->addrs[INDIRECT]) == 0){ if((addr = ip->addrs[NDIRECT]) == 0){
if(!alloc) if(!alloc)
return -1; return -1;
ip->addrs[INDIRECT] = addr = balloc(ip->dev); ip->addrs[NDIRECT] = addr = balloc(ip->dev);
} }
bp = bread(ip->dev, addr); bp = bread(ip->dev, addr);
a = (uint*)bp->data; a = (uint*)bp->data;
...@@ -375,16 +375,16 @@ itrunc(struct inode *ip) ...@@ -375,16 +375,16 @@ itrunc(struct inode *ip)
} }
} }
if(ip->addrs[INDIRECT]){ if(ip->addrs[NDIRECT]){
bp = bread(ip->dev, ip->addrs[INDIRECT]); bp = bread(ip->dev, ip->addrs[NDIRECT]);
a = (uint*)bp->data; a = (uint*)bp->data;
for(j = 0; j < NINDIRECT; j++){ for(j = 0; j < NINDIRECT; j++){
if(a[j]) if(a[j])
bfree(ip->dev, a[j]); bfree(ip->dev, a[j]);
} }
brelse(bp); brelse(bp);
bfree(ip->dev, ip->addrs[INDIRECT]); bfree(ip->dev, ip->addrs[NDIRECT]);
ip->addrs[INDIRECT] = 0; ip->addrs[NDIRECT] = 0;
} }
ip->size = 0; ip->size = 0;
......
fs.h
浏览文件 @ ba6cd8a6
...@@ -15,9 +15,7 @@ struct superblock { ...@@ -15,9 +15,7 @@ struct superblock {
uint ninodes; // Number of inodes. uint ninodes; // Number of inodes.
}; };
#define NADDRS (NDIRECT+1)
#define NDIRECT 12 #define NDIRECT 12
#define INDIRECT 12
#define NINDIRECT (BSIZE / sizeof(uint)) #define NINDIRECT (BSIZE / sizeof(uint))
#define MAXFILE (NDIRECT + NINDIRECT) #define MAXFILE (NDIRECT + NINDIRECT)
...@@ -28,7 +26,7 @@ struct dinode { ...@@ -28,7 +26,7 @@ struct dinode {
short minor; // Minor device number (T_DEV only) short minor; // Minor device number (T_DEV only)
short nlink; // Number of links to inode in file system short nlink; // Number of links to inode in file system
uint size; // Size of file (bytes) uint size; // Size of file (bytes)
uint addrs[NADDRS]; // Data block addresses uint addrs[NDIRECT+1]; // Data block addresses
}; };
// Inodes per block. // Inodes per block.
......
fsvar.h
浏览文件 @ ba6cd8a6
...@@ -11,7 +11,7 @@ struct inode { ...@@ -11,7 +11,7 @@ struct inode {
short minor; short minor;
short nlink; short nlink;
uint size; uint size;
uint addrs[NADDRS]; uint addrs[NDIRECT+1];
}; };
#define I_BUSY 0x1 #define I_BUSY 0x1
......
mkfs.c
浏览文件 @ ba6cd8a6
...@@ -259,17 +259,17 @@ iappend(uint inum, void *xp, int n) ...@@ -259,17 +259,17 @@ iappend(uint inum, void *xp, int n)
} }
x = xint(din.addrs[fbn]); x = xint(din.addrs[fbn]);
} else { } else {
if(xint(din.addrs[INDIRECT]) == 0) { if(xint(din.addrs[NDIRECT]) == 0) {
// printf("allocate indirect block\n"); // printf("allocate indirect block\n");
din.addrs[INDIRECT] = xint(freeblock++); din.addrs[NDIRECT] = xint(freeblock++);
usedblocks++; usedblocks++;
} }
// printf("read indirect block\n"); // printf("read indirect block\n");
rsect(xint(din.addrs[INDIRECT]), (char*) indirect); rsect(xint(din.addrs[NDIRECT]), (char*) indirect);
if(indirect[fbn - NDIRECT] == 0) { if(indirect[fbn - NDIRECT] == 0) {
indirect[fbn - NDIRECT] = xint(freeblock++); indirect[fbn - NDIRECT] = xint(freeblock++);
usedblocks++; usedblocks++;
wsect(xint(din.addrs[INDIRECT]), (char*) indirect); wsect(xint(din.addrs[NDIRECT]), (char*) indirect);
} }
x = xint(indirect[fbn-NDIRECT]); x = xint(indirect[fbn-NDIRECT]);
} }
......
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