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-rw-r--r--source4/ntvfs/posix/pvfs_open.c62
1 files changed, 62 insertions, 0 deletions
diff --git a/source4/ntvfs/posix/pvfs_open.c b/source4/ntvfs/posix/pvfs_open.c
index 4110df292d..12b70c00fd 100644
--- a/source4/ntvfs/posix/pvfs_open.c
+++ b/source4/ntvfs/posix/pvfs_open.c
@@ -1621,6 +1621,68 @@ NTSTATUS pvfs_can_rename(struct pvfs_state *pvfs,
}
/*
+ determine if the file size of a file can be changed,
+ or if it is prevented by an already open file
+*/
+NTSTATUS pvfs_can_update_file_size(struct pvfs_state *pvfs,
+ struct ntvfs_request *req,
+ struct pvfs_filename *name,
+ struct odb_lock **lckp)
+{
+ NTSTATUS status;
+ DATA_BLOB key;
+ struct odb_lock *lck;
+ uint32_t share_access;
+ uint32_t access_mask;
+ bool break_to_none;
+ bool delete_on_close;
+
+ status = pvfs_locking_key(name, name, &key);
+ if (!NT_STATUS_IS_OK(status)) {
+ return NT_STATUS_NO_MEMORY;
+ }
+
+ lck = odb_lock(req, pvfs->odb_context, &key);
+ if (lck == NULL) {
+ DEBUG(0,("Unable to lock opendb for can_stat\n"));
+ return NT_STATUS_INTERNAL_DB_CORRUPTION;
+ }
+
+ /* TODO: this may needs some more flags */
+ share_access = NTCREATEX_SHARE_ACCESS_WRITE;
+ access_mask = 0;
+ delete_on_close = false;
+ break_to_none = true;
+
+ status = odb_can_open(lck, name->stream_id,
+ share_access, access_mask, delete_on_close,
+ 0, break_to_none);
+
+ /*
+ * if it's a sharing violation or we got no oplock
+ * only keep the lock if the caller requested access
+ * to the lock
+ */
+ if (NT_STATUS_EQUAL(status, NT_STATUS_SHARING_VIOLATION) ||
+ NT_STATUS_EQUAL(status, NT_STATUS_OPLOCK_NOT_GRANTED)) {
+ if (lckp) {
+ *lckp = lck;
+ } else {
+ talloc_free(lck);
+ }
+ } else if (!NT_STATUS_IS_OK(status)) {
+ talloc_free(lck);
+ if (lckp) {
+ *lckp = NULL;
+ }
+ } else if (lckp) {
+ *lckp = lck;
+ }
+
+ return status;
+}
+
+/*
determine if file meta data can be accessed, or if it is prevented by an
already open file
*/