Initial import.

RAID 5 xor parity checking is working, data reading on left-assymetric RAID 5 is working.
Nothing done on other RAID types.

1 files changed, 75 insertions, 0 deletions

diff --git a/mydisks.py b/mydisks.py
new file mode 100644
index 0000000..c3b7716
--- /dev/null
+++ b/mydisks.py
@@ -0,0 +1,75 @@
+#!/usr/bin/env python
+
+# RaidGuessFS, a FUSE pseudo-filesystem to guess RAID parameters of a damaged device
+# Copyright (C) 2015 Ludovic Pouzenc <ludovic@pouzenc.fr>
+#
+# This file is part of RaidGuessFS.
+#
+# RaidGuessFS 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.
+#
+# RaidGuessFS 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 RaidGuessFS. If not, see <http://www.gnu.org/licenses/>
+
+import os, sys, logging
+
+class MyDisks():
+    """Auxiliary class, managing disk layer"""
+
+    def __init__(self, *args, **kwargs):
+        self.disks = []
+        self.disk_paths = []
+        self.disk_count = 0
+        self.disks_size = [0]
+        self.max_disks = 16
+
+    def get_disk_count(self):
+        return self.disk_count
+
+    def set_disks_path(self,disk_path_list):
+        """Set the list of real filepath to disks or images and (re)open them"""
+        self.disk_paths = disk_path_list
+
+    def set_disk_count(self,new_disk_count):
+        """Update the number of attached disks on the fly"""
+        self.disk_count = min(new_disk_count,self.max_disks)
+        logging.info("MyDisks.set_disk_count(%d) : setting disk_count to %d" % (new_disk_count, self.disk_count))
+
+    def open_disks(self):
+        """(re)open all disks"""
+        logging.debug("Enter open_disks()")
+        for fd in self.disks:
+            try:
+                fd.close()
+            except:
+                pass
+        self.disks = [ None for d in range(self.disk_count) ]
+        self.disks_size = [ 0 for d in range(self.disk_count) ]
+
+        for d in range(self.disk_count):
+            path = self.disk_paths[d]
+            logging.debug("Try to open disk #%2d"%d)
+            try:
+                self.disks[d] = open(path, "r")
+                self.disks_size[d] = os.lstat(path).st_size
+                logging.debug("Opened disk #%2d"%d)
+            except IOError as e:
+                logging.error("Can't open disk #%2d ('%s') : %s"%(d, path, e.strerror))
+                self.disks_size[d] = 0
+            except:
+                logging.error("Can't open disk #%2d ('%s') : unhandled exception"%(d, path))
+                self.disks_size[d] = 0
+        logging.debug("Exit. open_disks()")
+
+    def read(self,disk_no,offset,size):
+        self.disks[disk_no].seek(offset)
+        return self.disks[disk_no].read(size)
+
+