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make mkdir crash-safer, as noticed by many students on midterm

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This commit is contained in:
kolya 2008-10-16 15:18:49 +00:00
parent e1626709d6
commit f3e87bc838
1 changed files with 11 additions and 7 deletions
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18
sysfile.c
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@ -237,13 +237,6 @@ create(char *path, int canexist, short type, short major, short minor)
ip->minor = minor;
ip->nlink = 1;
iupdate(ip);
if(dirlink(dp, name, ip->inum) < 0){
ip->nlink = 0;
iunlockput(ip);
iunlockput(dp);
return 0;
}
if(type == T_DIR){ // Create . and .. entries.
dp->nlink++; // for ".."
@ -252,6 +245,17 @@ create(char *path, int canexist, short type, short major, short minor)
if(dirlink(ip, ".", ip->inum) < 0 || dirlink(ip, "..", dp->inum) < 0)
panic("create dots");
}
if(dirlink(dp, name, ip->inum) < 0){
dp->nlink--;
iupdate(dp);
iunlockput(dp);
ip->nlink = 0;
iunlockput(ip);
return 0;
}
iunlockput(dp);
return ip;
}