Ceph is a distributed object, block, and file storage platform
Go to file
Sage Weil 14d2efc438 mon/MonitorStore: always O_TRUNC when writing states
It is possible for a .new file to already exist, potentially with a
larger size.  This would happen if:

 - we were proposing a different value
 - we crashed (or were stopped) before it got renamed into place
 - after restarting, a different value was proposed and accepted.

This isn't so unlikely for the log state machine, where we're
aggregating random messages.  O_TRUNC ensure we avoid getting the tail
end of some previous junk.

I observed #2593 and found that a logm state value had a larger size on
one mon (after slurping) than the others, pointing to put_bl_sn_map().

While we are at it, O_TRUNC put_int() too; the same type of bug is
possible there, too.

Fixes: #2593
Signed-off-by: Sage Weil <sage@inktank.com>
2012-07-16 10:57:08 -07:00
admin
ceph-object-corpus@4d64c37511
debian debian: fix ceph-fs-common-dbg depends 2012-07-12 06:58:56 -07:00
doc doc: removed /srv/osd.$id.journal from ceph.conf example. 2012-07-03 14:20:34 -07:00
fusetrace
keys
m4
man
qa qa: download tests from specified branch 2012-07-13 13:35:07 -07:00
src mon/MonitorStore: always O_TRUNC when writing states 2012-07-16 10:57:08 -07:00
udev
wireshark
.gitignore crushtool: allow user to select output reporting in blocks 2012-06-06 11:07:00 -07:00
.gitmodules ceph.newdream.net -> ceph.com 2012-06-16 14:50:29 -07:00
AUTHORS
autogen.sh
ceph.spec.in Merge remote-tracking branch 'origin/stable' into next 2012-07-06 10:12:23 -07:00
ChangeLog
CodingStyle
configure.ac v0.48argonaut 2012-07-02 16:06:01 -07:00
COPYING
COPYING-LGPL2.1
do_autogen.sh
Doxyfile
INSTALL
Makefile.am Makefile: link gtest statically 2012-06-13 11:05:53 -07:00
NEWS
README ceph.newdream.net -> ceph.com 2012-06-16 14:50:29 -07:00
RELEASE_CHECKLIST
SubmittingPatches

============================================
Ceph - a scalable distributed storage system
============================================

Please see http://ceph.com/ for current info.

Contributing Code
=================

Most of Ceph is licensed under the LGPL version 2.1.  Some
miscellaneous code is under BSD-style license or is public domain.
The documentation is licensed under Creative Commons
Attribution-ShareAlike (CC BY-SA).  There are a handful of headers
included here that are licensed under the GPL.  Please see the file
COPYING for a full inventory of licenses by file.

Code contributions must include a valid "Signed-off-by" acknowledging
the license for the modified or contributed file.  Please see the file
SubmittingPatches for details on what that means and on how to
generate and submit patches.

We do not require assignment of copyright to contribute code; code is
contributed under the terms of the applicable license.


Building Ceph
=============

To prepare the source tree after it has been git cloned,

	$ git submodule update --init

To build the server daemons, and FUSE client, execute the following:

	$ ./autogen.sh
	$ ./configure
	$ make

(Note that the FUSE client will only be built if libfuse is present.)

Dependencies
------------

The configure script will complain about any missing dependencies as
it goes.  You can also refer to debian/control or ceph.spec.in for the
package build dependencies on those platforms.  In many cases,
dependencies can be avoided with --with-foo or --without-bar switches.
For example,

$ ./configure --with-nss         # use libnss instead of libcrypto++
$ ./configure --without-radosgw  # do not build radosgw and avoid libfcgi-dev
$ ./configure --without-tcmalloc # avoid google-perftools dependency


Building packages
-----------------

You can build packages for Debian or Debian-derived (e.g., Ubuntu)
systems with

$ sudo apt-get dpkg-dev
$ dpkg-checkbuilddeps        # make sure we have all dependencies
$ dpkg-buildpackage

For RPM-based systems (Redhat, Suse, etc.),

$ rpmbuild


Building the Documentation
==========================

Prerequisites
-------------
To build the documentation, you must install the following:

- python-dev
- python-pip
- python-virualenv
- doxygen
- ditaa
- libxml2-dev
- libxslt-dev
- dot
- graphviz

For example:

	sudo apt-get install python-dev python-pip python-virualenv doxygen ditaa libxml2-dev libxslt-dev dot graphviz

Building the Documentation
--------------------------

To build the documentation, ensure that you are in the top-level `/ceph directory, and execute the build script. For example:

	$ admin/build-doc


Build Prerequisites
-------------------
To build the source code, you must install the following:

- automake
- autoconf
- automake
- gcc
- g++
- libboost-dev
- libedit-dev
- libssl-dev
- libtool
- libfcgi
- libfcgi-dev
- libfuse-dev
- linux-kernel-headers
- libcrypto++-dev

For example:

	$ apt-get install automake autoconf automake gcc g++ libboost-dev libedit-dev libssl-dev libtool libfcgi libfcgi-dev libfuse-dev linux-kernel-headers libcrypto++-dev