/*
* return post-operation attributes using stat cache
*
* fd_decomp must be called before to fill the stat cache
*/
post_op_attr get_post_cached(struct svc_req * req)
{
if (!st_cache_valid)
return error_attr;
return get_post_buf(st_cache, req);
}
LOOKUP3res *nfsproc3_lookup_3_svc(LOOKUP3args * argp, struct svc_req * rqstp)
{
static LOOKUP3res result;
unfs3_fh_t *fh;
char *path;
char obj[NFS_MAXPATHLEN];
backend_statstruct buf;
int res;
uint32 gen;
PREP(path, argp->what.dir);
result.status = cat_name(path, argp->what.name, obj);
cluster_lookup(obj, rqstp, &result.status);
if (result.status == NFS3_OK) {
res = backend_lstat(obj, &buf);
if (res == -1)
result.status = lookup_err();
else {
if (strcmp(argp->what.name, ".") == 0 ||
strcmp(argp->what.name, "..") == 0) {
fh = fh_comp_ptr(obj, rqstp, 0);
} else {
gen = backend_get_gen(buf, FD_NONE, obj);
fh = fh_extend(argp->what.dir, buf.st_dev, buf.st_ino, gen);
fh_cache_add(buf.st_dev, buf.st_ino, obj);
}
if (fh) {
result.LOOKUP3res_u.resok.object.data.data_len =
fh_length(fh);
result.LOOKUP3res_u.resok.object.data.data_val = (char *) fh;
result.LOOKUP3res_u.resok.obj_attributes =
get_post_buf(buf, rqstp);
} else {
/* path was too long */
result.status = NFS3ERR_NAMETOOLONG;
}
}
}
/* overlaps with resfail */
result.LOOKUP3res_u.resok.dir_attributes = get_post_stat(path, rqstp);
return &result;
}
/*
* lowlevel routine for getting post-operation attributes
*/
static post_op_attr get_post_ll(const char *path, uint32 dev, uint64 ino,
struct svc_req *req)
{
backend_statstruct buf;
int res;
if (!path)
return error_attr;
res = backend_lstat(path, &buf);
if (res == -1)
return error_attr;
/* protect against local fs race */
if (dev != buf.st_dev || ino != buf.st_ino)
return error_attr;
return get_post_buf(buf, req);
}
CREATE3res *nfsproc3_create_3_svc(CREATE3args * argp, struct svc_req * rqstp)
{
static CREATE3res result;
char *path;
char obj[NFS_MAXPATHLEN];
sattr3 new_attr;
int fd = -1, res = -1;
backend_statstruct buf;
uint32 gen;
int flags = O_RDWR | O_CREAT | O_TRUNC | O_NONBLOCK;
PREP(path, argp->where.dir);
result.status = join(cat_name(path, argp->where.name, obj), exports_rw());
cluster_create(obj, rqstp, &result.status);
/* GUARDED and EXCLUSIVE maps to Unix exclusive create */
if (argp->how.mode != UNCHECKED)
flags = flags | O_EXCL;
if (argp->how.mode != EXCLUSIVE) {
new_attr = argp->how.createhow3_u.obj_attributes;
result.status = join(result.status, atomic_attr(new_attr));
}
/* Try to open the file */
if (result.status == NFS3_OK) {
if (argp->how.mode != EXCLUSIVE) {
fd = backend_open_create(obj, flags, create_mode(new_attr));
} else {
fd = backend_open_create(obj, flags, create_mode(new_attr));
}
}
if (fd != -1) {
/* Successful open */
res = backend_fstat(fd, &buf);
if (res != -1) {
/* Successful stat */
if (argp->how.mode == EXCLUSIVE) {
/* Save verifier in atime and mtime */
res =
backend_store_create_verifier(obj,
argp->how.createhow3_u.
verf);
}
}
if (res != -1) {
/* So far, so good */
gen = backend_get_gen(buf, fd, obj);
fh_cache_add(buf.st_dev, buf.st_ino, obj);
backend_close(fd);
result.CREATE3res_u.resok.obj =
fh_extend_post(argp->where.dir, buf.st_dev, buf.st_ino, gen);
result.CREATE3res_u.resok.obj_attributes =
get_post_buf(buf, rqstp);
}
if (res == -1) {
/* backend_fstat() or backend_store_create_verifier() failed */
backend_close(fd);
result.status = NFS3ERR_IO;
}
} else if (result.status == NFS3_OK) {
/* open() failed */
if (argp->how.mode == EXCLUSIVE && errno == EEXIST) {
/* Check if verifier matches */
fd = backend_open(obj, O_NONBLOCK);
if (fd != -1) {
res = backend_fstat(fd, &buf);
}
if (res != -1) {
if (backend_check_create_verifier
(&buf, argp->how.createhow3_u.verf)) {
/* The verifier matched. Return success */
gen = backend_get_gen(buf, fd, obj);
fh_cache_add(buf.st_dev, buf.st_ino, obj);
backend_close(fd);
result.CREATE3res_u.resok.obj =
fh_extend_post(argp->where.dir, buf.st_dev,
buf.st_ino, gen);
result.CREATE3res_u.resok.obj_attributes =
get_post_buf(buf, rqstp);
} else {
/* The verifier doesn't match */
result.status = NFS3ERR_EXIST;
}
}
}
if (res == -1) {
result.status = create_err();
}
}
/* overlaps with resfail */
result.CREATE3res_u.resok.dir_wcc.before = get_pre_cached();
result.CREATE3res_u.resok.dir_wcc.after = get_post_stat(path, rqstp);
return &result;
}