static int nfs_lookup(struct inode *dir, const char *__name, int len,
struct inode **result)
{
struct nfs_fh fhandle;
struct nfs_fattr fattr;
char name[len > NFS_MAXNAMLEN? 1 : len+1];
int error;
*result = NULL;
if (!dir || !S_ISDIR(dir->i_mode)) {
printk("nfs_lookup: inode is NULL or not a directory\n");
iput(dir);
return -ENOENT;
}
if (len > NFS_MAXNAMLEN) {
iput(dir);
return -ENAMETOOLONG;
}
memcpy(name,__name,len);
name[len] = '\0';
if (len == 1 && name[0] == '.') { /* cheat for "." */
*result = dir;
return 0;
}
if ((NFS_SERVER(dir)->flags & NFS_MOUNT_NOAC)
|| !nfs_lookup_cache_lookup(dir, name, &fhandle, &fattr)) {
if ((error = nfs_proc_lookup(NFS_SERVER(dir), NFS_FH(dir),
name, &fhandle, &fattr))) {
iput(dir);
return error;
}
nfs_lookup_cache_add(dir, name, &fhandle, &fattr);
}
if (!(*result = nfs_fhget(dir->i_sb, &fhandle, &fattr))) {
iput(dir);
return -EACCES;
}
iput(dir);
return 0;
}
/* The following X functions affect are the only ones that affect the name
cache (and the directory cache):
nfs_open (in file nfs_lookup_cache.c),
nfs_lookup (in file nfs_lookup_cache.c),
nfs_link,
nfs_symlink,
nfs_mkdir,
nfs_rmdir,
nfs_rename
*/
int
nfs_unlink(struct file *dirp, const char *name) {
nfsc_p d,f;
int dev;
struct nfs_fh *fhandle;
int status,lookup_status;
DPRINTF(CLU_LEVEL,("** nfs_unlink %s\n",name));
demand(dirp, bogus filp);
d = GETNFSCE(dirp);
fhandle = GETFHANDLE(dirp);
dev = FHGETDEV(fhandle);
lookup_status = nfs_cache_lookup(dev,GETNFSCEINO(d),name,&f);
switch(lookup_status) {
case -1:
/* negative cache hit, treat it as a miss to be sure is properly removed */
case 0:
/* cache miss */
{
struct nfs_fh fhandle2;
struct nfs_fattr temp_fattr;
k2printf("nfs_unlink: nfs_proc_lookup %s\n",name);
status = nfs_proc_lookup(fhandle,
name,
&fhandle2,
&temp_fattr);
if (status != 0) {
errno = status;
return -1;
}
f = nfsc_get(dev,temp_fattr.fileid);
nfs_fill_stat(&temp_fattr, f);
}
/* fall-through now that we have setup f */
case 1:
/* cache hit */
if (nfsc_get_refcnt(f) == 1) {
/* last copy */
if (S_ISDIR(nfsc_get_mode(f))) {
status = nfs_proc_rmdir(fhandle, name);
//fprintf(stderr,"rmdir status %d\n",status);
} else {
status = nfs_proc_remove(fhandle,name);
//fprintf(stderr,"remove status %d\n",status);
}
if (status == 0) {
nfs_cache_remove(dirp,NULL);
nfs_flush_filp(dirp);
}
nfsc_put(f);
if (status != 0) {
errno = status; return -1;
}
return 0;
} else {
/* has other references */
static int i = 0;
char difname[NAME_MAX];
//fprintf(stderr,"removing a file that is still referenced: %s\n",name);
demand (!(S_ISDIR(f->sb.st_mode)), removing last ref directory);
if (i == 0) atexit(nfs_process_unlinkatend);
sprintf(difname,".nfs%d%d.%s",time(0),i++,name);
status = nfs_proc_rename(fhandle,name,fhandle,difname);
if (status != 0) fprintf(stderr,"could not rename %s\n",name);
nfs_cache_remove(dirp,name);
nfs_flush_filp(dirp);
nfs_unlinkatend(difname, fhandle);
nfsc_put(f);
/* since it will be unlinked we can avoid flushing on close */
nfsc_or_flags(f,NFSCE_WILLBEGONE);
return 0;
}
default:
PR;
assert(0);
return 0;
}
}
