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-rw-r--r--source3/smbd/files.c24
-rw-r--r--source3/smbd/proto.h1
2 files changed, 25 insertions, 0 deletions
diff --git a/source3/smbd/files.c b/source3/smbd/files.c
index 3fc36d5783..18330805d8 100644
--- a/source3/smbd/files.c
+++ b/source3/smbd/files.c
@@ -597,6 +597,30 @@ files_struct *file_fsp(struct smb_request *req, uint16 fid)
return fsp;
}
+uint64_t fsp_persistent_id(const struct files_struct *fsp)
+{
+ uint64_t persistent_id;
+
+ /*
+ * This calculates a number that is most likely
+ * globally unique. In future we will have a database
+ * to make it completely unique.
+ *
+ * 32-bit random gen_id
+ * 16-bit truncated open_time
+ * 16-bit fnum (valatile_id)
+ */
+ persistent_id = fsp->fh->gen_id & UINT32_MAX;
+ persistent_id <<= 16;
+ persistent_id &= 0x0000FFFFFFFF0000LLU;
+ persistent_id |= fsp->open_time.tv_usec & UINT16_MAX;
+ persistent_id <<= 16;
+ persistent_id &= 0xFFFFFFFFFFFF0000LLU;
+ persistent_id |= fsp->fnum & UINT16_MAX;
+
+ return persistent_id;
+}
+
struct files_struct *file_fsp_smb2(struct smbd_smb2_request *smb2req,
uint64_t persistent_id,
uint64_t volatile_id)
diff --git a/source3/smbd/proto.h b/source3/smbd/proto.h
index e7bc3eb5b4..53d9e2dd37 100644
--- a/source3/smbd/proto.h
+++ b/source3/smbd/proto.h
@@ -387,6 +387,7 @@ bool file_find_subpath(files_struct *dir_fsp);
void file_sync_all(connection_struct *conn);
void file_free(struct smb_request *req, files_struct *fsp);
files_struct *file_fsp(struct smb_request *req, uint16 fid);
+uint64_t fsp_persistent_id(const struct files_struct *fsp);
struct files_struct *file_fsp_smb2(struct smbd_smb2_request *smb2req,
uint64_t persistent_id,
uint64_t volatile_id);