summaryrefslogtreecommitdiff
path: root/source4/ntvfs/posix/pvfs_streams.c
diff options
context:
space:
mode:
Diffstat (limited to 'source4/ntvfs/posix/pvfs_streams.c')
-rw-r--r--source4/ntvfs/posix/pvfs_streams.c322
1 files changed, 322 insertions, 0 deletions
diff --git a/source4/ntvfs/posix/pvfs_streams.c b/source4/ntvfs/posix/pvfs_streams.c
index b71ff640e5..7edf111fc9 100644
--- a/source4/ntvfs/posix/pvfs_streams.c
+++ b/source4/ntvfs/posix/pvfs_streams.c
@@ -25,3 +25,325 @@
#include "vfs_posix.h"
#include "librpc/gen_ndr/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_p(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_p(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_p(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(s->name, name->stream_name) == 0) {
+ name->dos.alloc_size = 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_p(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(s->name, name->stream_name) == 0) {
+ s->size = size;
+ s->alloc_size = size;
+ break;
+ }
+ }
+
+ if (i == streams->num_streams) {
+ struct xattr_DosStream *s;
+ streams->streams = talloc_realloc_p(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 = 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_p(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(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;
+ }
+ /* 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, 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;
+ /* 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, 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;
+}
generated by cgit (git 2.34.1) at 2024-07-08 10:08:30 +0000