/* 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 2 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, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ #include "includes.h" #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(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; }