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/*
Unix SMB/CIFS implementation.
POSIX NTVFS backend - alternate data streams
Copyright (C) Andrew Tridgell 2004
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
#include "vfs_posix.h"
#include "librpc/gen_ndr/xattr.h"
/*
return the list of file streams for RAW_FILEINFO_STREAM_INFORMATION
*/
NTSTATUS pvfs_stream_information(struct pvfs_state *pvfs,
TALLOC_CTX *mem_ctx,
struct pvfs_filename *name, int fd,
struct stream_information *info)
{
struct xattr_DosStreams *streams;
int i;
NTSTATUS status;
streams = talloc(mem_ctx, struct xattr_DosStreams);
if (streams == NULL) {
return NT_STATUS_NO_MEMORY;
}
status = pvfs_streams_load(pvfs, name, fd, streams);
if (!NT_STATUS_IS_OK(status)) {
ZERO_STRUCTP(streams);
}
info->num_streams = streams->num_streams+1;
info->streams = talloc_array(mem_ctx, struct stream_struct, info->num_streams);
if (!info->streams) {
return NT_STATUS_NO_MEMORY;
}
info->streams[0].size = name->st.st_size;
info->streams[0].alloc_size = name->dos.alloc_size;
info->streams[0].stream_name.s = talloc_strdup(info->streams, "::$DATA");
for (i=0;i<streams->num_streams;i++) {
info->streams[i+1].size = streams->streams[i].size;
info->streams[i+1].alloc_size = streams->streams[i].alloc_size;
info->streams[i+1].stream_name.s = talloc_asprintf(streams->streams,
":%s:$DATA",
streams->streams[i].name);
}
return NT_STATUS_OK;
}
/*
fill in the stream information for a name
*/
NTSTATUS pvfs_stream_info(struct pvfs_state *pvfs, struct pvfs_filename *name, int fd)
{
struct xattr_DosStreams *streams;
int i;
NTSTATUS status;
/* the NULL stream always exists */
if (name->stream_name == NULL) {
name->stream_exists = True;
return NT_STATUS_OK;
}
streams = talloc(name, struct xattr_DosStreams);
if (streams == NULL) {
return NT_STATUS_NO_MEMORY;
}
status = pvfs_streams_load(pvfs, name, fd, streams);
if (!NT_STATUS_IS_OK(status)) {
talloc_free(streams);
return status;
}
for (i=0;i<streams->num_streams;i++) {
struct xattr_DosStream *s = &streams->streams[i];
if (strcasecmp_m(s->name, name->stream_name) == 0) {
name->dos.alloc_size = pvfs_round_alloc_size(pvfs, s->alloc_size);
name->st.st_size = s->size;
name->stream_exists = True;
talloc_free(streams);
return NT_STATUS_OK;
}
}
talloc_free(streams);
name->dos.alloc_size = 0;
name->st.st_size = 0;
name->stream_exists = False;
return NT_STATUS_OK;
}
/*
update size information for a stream
*/
static NTSTATUS pvfs_stream_update_size(struct pvfs_state *pvfs, struct pvfs_filename *name, int fd,
off_t size)
{
struct xattr_DosStreams *streams;
int i;
NTSTATUS status;
streams = talloc(name, struct xattr_DosStreams);
if (streams == NULL) {
return NT_STATUS_NO_MEMORY;
}
status = pvfs_streams_load(pvfs, name, fd, streams);
if (!NT_STATUS_IS_OK(status)) {
ZERO_STRUCTP(streams);
}
for (i=0;i<streams->num_streams;i++) {
struct xattr_DosStream *s = &streams->streams[i];
if (strcasecmp_m(s->name, name->stream_name) == 0) {
s->size = size;
s->alloc_size = pvfs_round_alloc_size(pvfs, size);
break;
}
}
if (i == streams->num_streams) {
struct xattr_DosStream *s;
streams->streams = talloc_realloc(streams, streams->streams,
struct xattr_DosStream,
streams->num_streams+1);
if (streams->streams == NULL) {
talloc_free(streams);
return NT_STATUS_NO_MEMORY;
}
streams->num_streams++;
s = &streams->streams[i];
s->flags = XATTR_STREAM_FLAG_INTERNAL;
s->size = size;
s->alloc_size = pvfs_round_alloc_size(pvfs, size);
s->name = name->stream_name;
}
status = pvfs_streams_save(pvfs, name, fd, streams);
talloc_free(streams);
return status;
}
/*
create the xattr for a alternate data stream
*/
NTSTATUS pvfs_stream_create(struct pvfs_state *pvfs,
struct pvfs_filename *name,
int fd)
{
NTSTATUS status;
status = pvfs_xattr_create(pvfs, name->full_name, fd,
XATTR_DOSSTREAM_PREFIX, name->stream_name);
if (!NT_STATUS_IS_OK(status)) {
return status;
}
return pvfs_stream_update_size(pvfs, name, fd, 0);
}
/*
delete the xattr for a alternate data stream
*/
NTSTATUS pvfs_stream_delete(struct pvfs_state *pvfs,
struct pvfs_filename *name,
int fd)
{
NTSTATUS status;
struct xattr_DosStreams *streams;
int i;
status = pvfs_xattr_delete(pvfs, name->full_name, fd,
XATTR_DOSSTREAM_PREFIX, name->stream_name);
if (!NT_STATUS_IS_OK(status)) {
return status;
}
streams = talloc(name, struct xattr_DosStreams);
if (streams == NULL) {
return NT_STATUS_NO_MEMORY;
}
status = pvfs_streams_load(pvfs, name, fd, streams);
if (!NT_STATUS_IS_OK(status)) {
talloc_free(streams);
return status;
}
for (i=0;i<streams->num_streams;i++) {
struct xattr_DosStream *s = &streams->streams[i];
if (strcasecmp_m(s->name, name->stream_name) == 0) {
memmove(s, s+1, (streams->num_streams - (i+1)) * sizeof(*s));
streams->num_streams--;
break;
}
}
status = pvfs_streams_save(pvfs, name, fd, streams);
talloc_free(streams);
return status;
}
/*
the equvalent of pread() on a stream
*/
ssize_t pvfs_stream_read(struct pvfs_state *pvfs,
struct pvfs_file_handle *h, void *data, size_t count, off_t offset)
{
NTSTATUS status;
DATA_BLOB blob;
if (count == 0) {
return 0;
}
status = pvfs_xattr_load(pvfs, h, h->name->full_name, h->fd, XATTR_DOSSTREAM_PREFIX,
h->name->stream_name, offset+count, &blob);
if (!NT_STATUS_IS_OK(status)) {
errno = EIO;
return -1;
}
if (offset >= blob.length) {
data_blob_free(&blob);
return 0;
}
if (count > blob.length - offset) {
count = blob.length - offset;
}
memcpy(data, blob.data + offset, count);
data_blob_free(&blob);
return count;
}
/*
the equvalent of pwrite() on a stream
*/
ssize_t pvfs_stream_write(struct pvfs_state *pvfs,
struct pvfs_file_handle *h, const void *data, size_t count, off_t offset)
{
NTSTATUS status;
DATA_BLOB blob;
if (count == 0) {
return 0;
}
if (offset > XATTR_MAX_STREAM_SIZE) {
errno = ENOSPC;
return -1;
}
/* we have to load the existing stream, then modify, then save */
status = pvfs_xattr_load(pvfs, h, h->name->full_name, h->fd, XATTR_DOSSTREAM_PREFIX,
h->name->stream_name, offset+count, &blob);
if (!NT_STATUS_IS_OK(status)) {
blob = data_blob(NULL, 0);
}
if (count+offset > blob.length) {
blob.data = talloc_realloc(blob.data, blob.data, uint8_t, count+offset);
if (blob.data == NULL) {
errno = ENOMEM;
return -1;
}
if (offset > blob.length) {
memset(blob.data+blob.length, 0, offset - blob.length);
}
blob.length = count+offset;
}
memcpy(blob.data + offset, data, count);
status = pvfs_xattr_save(pvfs, h->name->full_name, h->fd, XATTR_DOSSTREAM_PREFIX,
h->name->stream_name, &blob);
if (!NT_STATUS_IS_OK(status)) {
data_blob_free(&blob);
/* getting this error mapping right is probably
not worth it */
errno = ENOSPC;
return -1;
}
status = pvfs_stream_update_size(pvfs, h->name, h->fd, blob.length);
data_blob_free(&blob);
if (!NT_STATUS_IS_OK(status)) {
errno = EIO;
return -1;
}
return count;
}
/*
the equvalent of truncate() on a stream
*/
NTSTATUS pvfs_stream_truncate(struct pvfs_state *pvfs,
struct pvfs_filename *name, int fd, off_t length)
{
NTSTATUS status;
DATA_BLOB blob;
if (length > XATTR_MAX_STREAM_SIZE) {
return NT_STATUS_DISK_FULL;
}
/* we have to load the existing stream, then modify, then save */
status = pvfs_xattr_load(pvfs, name, name->full_name, fd, XATTR_DOSSTREAM_PREFIX,
name->stream_name, length, &blob);
if (!NT_STATUS_IS_OK(status)) {
return status;
}
if (length <= blob.length) {
blob.length = length;
} else if (length > blob.length) {
blob.data = talloc_realloc(blob.data, blob.data, uint8_t, length);
if (blob.data == NULL) {
return NT_STATUS_NO_MEMORY;
}
memset(blob.data+blob.length, 0, length - blob.length);
blob.length = length;
}
status = pvfs_xattr_save(pvfs, name->full_name, fd, XATTR_DOSSTREAM_PREFIX,
name->stream_name, &blob);
data_blob_free(&blob);
if (NT_STATUS_IS_OK(status)) {
status = pvfs_stream_update_size(pvfs, name, fd, blob.length);
}
return status;
}
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