Delete a patch

Adjust typesetting of code

mmu.h

@@ -144,7 +144,6 @@ struct taskstate {
   ushort iomb;       // I/O map base address
 };
 
-// PAGEBREAK: 12
 // Gate descriptors for interrupts and traps
 struct gatedesc {
   uint off_15_0 : 16;   // low 16 bits of offset in segment
@@ -180,4 +179,3 @@ struct gatedesc {
 }
 
 #endif
-

runoff

@@ -14,6 +14,7 @@ pad()
 mkdir -p fmt
 rm -f fmt/*
 cp README fmt
+echo > fmt/blank
 files=`grep -v '^#' runoff.list | awk '{print $1}'`
 n=99
 for i in $files
@@ -215,6 +216,8 @@ awk '
 	pr -t -l50 -2 refs | ../pr.pl -h "cross-references" | pad
 	# pr.pl -h "definitions" -2 t.defs | pad
 	# pr.pl -h "cross-references" -2 refs | pad
+	../pr.pl blank  # make sheet 1 start on left page
+	../pr.pl blank
 	for i in $files
 	do
 		../pr.pl -h "xv6/$i" $i

symlink.patch

@@ -1,151 +0,0 @@
-diff -r f8a4e40ab1d6 fs.c
---- a/fs.c	Thu Aug 30 14:32:06 2007 -0400
-+++ b/fs.c	Thu Aug 30 14:29:02 2007 -0400
-@@ -577,12 +577,18 @@ skipelem(char *path, char *name)
- // If parent != 0, return the inode for the parent and copy the final
- // path element into name, which must have room for DIRSIZ bytes.
- static struct inode*
--_namei(char *path, int parent, char *name)
-+_namei(struct inode *root, char *path, int parent, char *name, int depth)
- {
-   struct inode *ip, *next;
-+  char buf[100], tname[DIRSIZ];
-+
-+  if(depth > 5)
-+    return 0;
- 
-   if(*path == '/')
-     ip = iget(ROOTDEV, 1);
-+  else if(root)
-+    ip = idup(root);
-   else
-     ip = idup(cp->cwd);
- 
-@@ -598,10 +604,24 @@ _namei(char *path, int parent, char *nam
-       return ip;
-     }
-     if((next = dirlookup(ip, name, 0)) == 0){
-+      cprintf("did not find %s\n", name);
-       iunlockput(ip);
-       return 0;
-     }
--    iunlockput(ip);
-+    iunlock(ip);
-+    ilock(next);
-+    if(next->type == T_SYMLINK){
-+      if(next->size >= sizeof(buf) || readi(next, buf, 0, next->size) != next->size){
-+        iunlockput(next);
-+        iput(ip);
-+        return 0;
-+      }
-+      buf[next->size] = 0;
-+      iunlockput(next);
-+      next = _namei(ip, buf, 0, tname, depth+1);
-+    }else
-+      iunlock(next);
-+    iput(ip);
-     ip = next;
-   }
-   if(parent){
-@@ -615,11 +635,11 @@ namei(char *path)
- namei(char *path)
- {
-   char name[DIRSIZ];
--  return _namei(path, 0, name);
-+  return _namei(0, path, 0, name, 0);
- }
- 
- struct inode*
- nameiparent(char *path, char *name)
- {
--  return _namei(path, 1, name);
--}
-+  return _namei(0, path, 1, name, 0);
-+}
-diff -r f8a4e40ab1d6 fs.h
---- a/fs.h	Thu Aug 30 14:32:06 2007 -0400
-+++ b/fs.h	Thu Aug 30 13:05:43 2007 -0400
-@@ -33,6 +33,7 @@ struct dinode {
- #define T_DIR  1   // Directory
- #define T_FILE 2   // File
- #define T_DEV  3   // Special device
-+#define T_SYMLINK 4  // Symlink
- 
- // Inodes per block.
- #define IPB           (BSIZE / sizeof(struct dinode))
-diff -r f8a4e40ab1d6 syscall.c
---- a/syscall.c	Thu Aug 30 14:32:06 2007 -0400
-+++ b/syscall.c	Thu Aug 30 13:05:29 2007 -0400
-@@ -96,6 +96,7 @@ extern int sys_unlink(void);
- extern int sys_unlink(void);
- extern int sys_wait(void);
- extern int sys_write(void);
-+extern int sys_symlink(void);
- 
- static int (*syscalls[])(void) = {
- [SYS_chdir]   sys_chdir,
-@@ -118,6 +119,7 @@ static int (*syscalls[])(void) = {
- [SYS_unlink]  sys_unlink,
- [SYS_wait]    sys_wait,
- [SYS_write]   sys_write,
-+[SYS_symlink]	sys_symlink,
- };
- 
- void
-diff -r f8a4e40ab1d6 syscall.h
---- a/syscall.h	Thu Aug 30 14:32:06 2007 -0400
-+++ b/syscall.h	Thu Aug 30 13:02:48 2007 -0400
-@@ -19,3 +19,4 @@
- #define SYS_getpid 18
- #define SYS_sbrk   19
- #define SYS_sleep  20
-+#define SYS_symlink 21
-diff -r f8a4e40ab1d6 sysfile.c
---- a/sysfile.c	Thu Aug 30 14:32:06 2007 -0400
-+++ b/sysfile.c	Thu Aug 30 13:10:31 2007 -0400
-@@ -257,6 +257,21 @@ create(char *path, int canexist, short t
- }
- 
- int
-+sys_symlink(void)
-+{
-+  char *old, *new;
-+  struct inode *ip;
-+  
-+  if(argstr(0, &old) < 0 || argstr(1, &new) < 0)
-+    return -1;
-+  if((ip = create(new, 0, T_SYMLINK, 0, 0)) == 0)
-+    return -1;
-+  writei(ip, old, 0, strlen(old));
-+  iunlockput(ip);
-+  return 0;
-+}
-+
-+int
- sys_open(void)
- {
-   char *path;
-@@ -393,3 +408,4 @@ sys_pipe(void)
-   fd[1] = fd1;
-   return 0;
- }
-+
-diff -r f8a4e40ab1d6 user.h
---- a/user.h	Thu Aug 30 14:32:06 2007 -0400
-+++ b/user.h	Thu Aug 30 13:02:34 2007 -0400
-@@ -21,6 +21,7 @@ int getpid();
- int getpid();
- char* sbrk(int);
- int sleep(int);
-+int symlink(int);
- 
- // ulib.c
- int stat(char*, struct stat*);
-diff -r f8a4e40ab1d6 usys.S
---- a/usys.S	Thu Aug 30 14:32:06 2007 -0400
-+++ b/usys.S	Thu Aug 30 13:05:54 2007 -0400
-@@ -28,3 +28,4 @@ STUB(getpid)
- STUB(getpid)
- STUB(sbrk)
- STUB(sleep)
-+STUB(symlink)