From e36a0ebf189a826aaa63909c5518c16356f5f903 Mon Sep 17 00:00:00 2001
From: Jakob Unterwurzacher
Date: Sun, 12 Nov 2017 20:06:13 +0100
Subject: main: add "-sharedstorage" flag

At the moment, it does two things:

1. Disable stat() caching so changes to the backing storage show up
   immediately.
2. Disable hard link tracking, as the inode numbers on the backing
   storage are not stable when files are deleted and re-created behind
   our back. This would otherwise produce strange "file does not exist"
   and other errors.

Mitigates https://github.com/rfjakob/gocryptfs/issues/156
---
 Documentation/duplicate-inodes.txt | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)
 create mode 100644 Documentation/duplicate-inodes.txt

(limited to 'Documentation/duplicate-inodes.txt')

diff --git a/Documentation/duplicate-inodes.txt b/Documentation/duplicate-inodes.txt
new file mode 100644
index 0000000..36fb89c
--- /dev/null
+++ b/Documentation/duplicate-inodes.txt
@@ -0,0 +1,36 @@
+ls: cannot access foo: No such file or directory
+ls: cannot access foo: No such file or directory
+ls: cannot access foo: No such file or directory
+ls: cannot access foo: No such file or directory
+36962337 -rwxrwxrwx 1 u1026 users 0 Nov 11 18:00 foo
+36962337 -rwxrwxrwx 1 u1026 users 0 Nov 11 18:00 foo
+36962337 -rwxrwxrwx 1 u1026 users 0 Nov 11 18:00 foo
+36962337 -rwxrwxrwx 1 u1026 users 0 Nov 11 18:00 foo
+
+
+u1026@d8min:/mnt/synology/public/tmp/g1$ strace -e lstat -p 8899 -f
+Process 8899 attached with 10 threads
+2017/11/11 18:12:21 Dispatch 238: LOOKUP, NodeId: 1. names: [foo] 4 bytes
+[pid 10539] lstat("/mnt/synology/public/tmp/g1/a/4DZNVle_txclugO7n_FRIg", 0xc4241adbe8) = -1 ENOENT (No such file or directory)
+2017/11/11 18:12:21 Serialize 238: LOOKUP code: OK value: {NodeId: 0 Generation=0 EntryValid=1.000 AttrValid=0.000 Attr={M00 SZ=0 L=0 0:0 B0*0 i0:0 A 0.000000000 M 0.000000000 C 0.000000000}}
+2017/11/11 18:12:22 Dispatch 239: LOOKUP, NodeId: 1. names: [foo] 4 bytes
+[pid  8903] lstat("/mnt/synology/public/tmp/g1/a/Xsy8mhdcIh0u9aiI7-iLiw", {st_mode=S_IFREG|0777, st_size=0, ...}) = 0
+2017/11/11 18:12:22 Serialize 239: LOOKUP code: OK value: {NodeId: 3 Generation=4 EntryValid=1.000 AttrValid=1.000 Attr={M0100777 SZ=0 L=1 1026:100 B0*16384 i0:36962337 A 1510419642.457639700 M 1510419642.457639700 C 1510419702.353712800}}
+
+
+Call Trace:
+
+nodefs/fsops.go   (c *rawBridge) Lookup
+	nodefs/fsops.go   (c *FileSystemConnector) internalLookup
+		nodefs/inode.go   (n *Inode) GetChild
+		pathfs/pathfs.go  (n *pathInode) GetAttr
+			pathfs/pathfs.go  (n *pathInode) GetPath
+				nodefs/inode.go   (n *Inode) Parent()
+			pathfs/loopback.go (fs *loopbackFileSystem) GetAttr
+
+Call Trace 2 (new child):
+
+nodefs/fsops.go   (c *rawBridge) Lookup
+	nodefs/fsops.go   (c *FileSystemConnector) internalLookup
+		pathfs/pathfs.go  (n *pathInode) Lookup
+			pathfs/pathfs.go  (n *pathInode) findChild
-- 
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