search for: zerofree

Hi- Is it safe to use the zerofree utility on an ext4 partition inside an LVM with guestfish? I know zerofree works on ext4, but I am unsure about LVM. The info page uses the syntax "zerofree <device>", so using the info page example, could I (safely) do something like the following? $ guestfish Welcome to gue...

zerofree is a package that can take an ext2 (only?) filesystem, work out what parts of the filesystem are not used, and either zero them or sparsify them. This was useful in about 2009 when I added it to Fedora. However nowadays it's more convenient to use the equivalent kernel functionality (via the...

Hi all, Can I ask if zerofree or resize2fs could also be applicable to ext4? Guestfish help of these two commands indicates that they are applicable to ext2/3. But ext4 is not covered in the help. However, I have tested these two commands in my Fedora 12 laptop, and it seems that both commands work well with ext4. So I don'...

Hello Richard, On Sun, 18 Feb 2018, Richard W.M. Jones wrote: > If you wish to take it over, I can orphan it instead. I'm happy to take zerofree. Regards, Robert

...r these reasons that I don't think you should use this package > and I intend to retire it unless anyone says otherwise. Last time I used it (a year ago?) it worked properly for ext3 and ext4, but on RHEL rather on Fedora. Not sure which features you are talking about in detail, but bumping zerofree from 1.0.3 to 1.1.0 would add 64 bit block no. support at least... Regards, Robert

...courage users to depend on specific versions (instead, they should test for required features). Another is that the version of Sys::Guestfs doesn't really tell you what is available in the dynamically-loaded libguestfs.so, nor in the daemon/appliance. Worked example: Your program needs $g->zerofree. (1) May or may not exist in the Perl library. (2) May or may not exist in the C API (libguestfs.so). (3) May or may not exist in the daemon (stubs.c:zerofree_stub) (4) May or may not have been added to the appliance (/usr/bin/zerofree) Since so much can potentially go wrong, I think the only...

...in a Xen domU kernel. It seems to do what I want, but is it any good? 2. The patch is now for ext2 only, the original ext3 version having succumbed to bitrot. What would it take to implement something similar for ext3 these days? Ron --- linux-2.6.16/Documentation/filesystems/ext2.txt.zerofree 2006-03-20 05:53:29.000000000 +0000 +++ linux-2.6.16/Documentation/filesystems/ext2.txt 2006-04-02 09:21:52.000000000 +0100 @@ -58,6 +58,8 @@ nobh Do not attach buffer_heads to fi xip Use execute in place (no caching) if possible +zerofree Zero data blocks when they are freed. + grpqu...

...n't think you should use this package > > and I intend to retire it unless anyone says otherwise. > > Last time I used it (a year ago?) it worked properly for ext3 and ext4, but > on RHEL rather on Fedora. Not sure which features you are talking about in > detail, but bumping zerofree from 1.0.3 to 1.1.0 would add 64 bit block no. > support at least... Would fstrim or virt-sparsify have worked for you? I feel that supporting something which has been rejected by the e2fsprogs community is difficult, especially when it concerns data integrity. If you wish to take it over, I...

Is there a utility to zero unused blocks on a disk? CentOS 6.7/Ext4 I saw zerofree, but I?m not sure it would work on Ext4 or even work on this version of CentOS. thanks, -wes

..."Richard W.M. Jones" <rjones at redhat.com> Callers are supposed to use the availability API to check for functions that may not be available in particular builds of libguestfs. If they don't do this, currently they tend to get obscure error messages, eg: libguestfs: error: zerofree: /dev/vda1: zerofree: No such file or directory This commit changes the error message to explain what callers ought to be doing instead: libguestfs: error: zerofree: feature 'zerofree' is not available in this build of libguestfs. Read 'AVAILABILITY' in the guestfs(3) man pag...

On 09/02/16 12:08 AM, g wrote: > > > On 02/08/16 15:34, Wes James wrote: >> Is there a utility to zero unused blocks on a disk? >> >> CentOS 6.7/Ext4 >> >> I saw zerofree, but I?m not sure it would work on Ext4 or even work on >> this version of CentOS. >> >> thanks, >> > . > a comment on replies to your post. > > i find it interesting that "Subject:" is and you ask for info to > > *zero unused blocks on disk*...

...c2a libsocket6-perl libstring-shellquote-perl libsub-name-perl libsys-virt-perl libtiff5 libtimedate-perl liburi-perl libwin-hivex-perl libwww-perl libwww-robotrules-perl libxapian22 libxml-parser-perl libxml-xpath-perl netpbm poppler-data python-xapian reiserfsprogs scrub supermin xfsprogs zerofree zfs-fuse Suggested packages: app-install-data python-xdg aptitude-doc-en aptitude-doc tasksel debtags binutils-doc ghostscript-x hpijs libterm-readline-gnu-perl libterm-readline-perl-perl libdigest-hmac-perl libgssapi-perl cups-common libcwidget-dev fonts-droid libdata-dump-perl libintl-xs-...

...7 +144,14 @@ ocfs2-tools */ parted procps -procps-ng psmisc rsync -scrub sed strace syslinux tar udev util-linux -util-linux-ng #ifndef UBUNTU /* on Ubuntu contains a file in /lib64 which conflicts with libc6 that has * /lib64 as a symbolic link @@ -165,6 +160,14 @@ xfsprogs #endif zerofree +#ifndef SUSE +gdisk +kmod +procps-ng +scrub +util-linux-ng +#endif + #ifdef VALGRIND_DAEMON valgrind #endif

...erfs-utils -i libselinux -i udev -i util-linux-ng -i vim-minimal -i xz > -i zfs-fuse -i acl -i attr -i bash -i binutils -i coreutils -i dosfstools > -i file -i gawk -i grub -i jfsutils -i lsof -i lvm2 -i module-init-tools -i > net-tools -i parted -i procps -i scrub -i strace -i xfsprogs -i zerofree -u > none rhel-6 initramfs file:///home/cacti/rpmbuild/ > BUILD/libguestfs-1.7.17/repo > febootstrap > | 1.3 kB 00:00 ... > febootstrap/primary > | 206 B 00:00 ... > Setting up Install Process > No package augeas-libs available. > No package btrfs-progs available...

...; > So really there's no use for virt-sparsify on a snapshot (although you > could also argue this is a bug or missing feature in qemu-img). > Indeed, as in real life, I expect that in any level of the snapshot tree there are opportunities to sparsify blocks. Perhaps I should run 'zerofree' when the VM is up, so the blocks become zero'ed on the right snapshot? Not sure how that would help a lot, though. It might on newer storage, which will recognize zero blocks as free on the underlying storage level. Y. > Rich. > > -- > Richard Jones, Virtualization Group, Re...

...o affect other subvolumes vfs_label vfs_type vfs_uuid Device name mangling: These apis are used to return sanitised device names. I'm not 100% convinced we need to modify them. However, we may want additional apis which handle filesystem descriptors. canonical_device_name part_to_dev Misc: zerofree: only actually supports ext2 and ext3, but the operation makes sense for any filesystem. We should update the api and consider the implementation later. findfs_label findfs_uuid: These return a device which contains the btrfs filesystem. This device will be mountable, even if the filesystem spans...

Hello, I was asked if it is possible to zero unused space in ext3 partition? Users write to the server via Samba and are far from computer geeks so teaching them to use some safedelete utility is quite impossible. Is there some way or utility to wipe out all the data from unused space? Thanks, Mindaugas

Hello, I was asked if it is possible to zero unused space in ext3 partition? Users write to the server via Samba and are far from computer geeks so teaching them to use some safedelete utility is quite impossible. Is there some way or utility to wipe out all the data from unused space? Thanks, Mindaugas

...78 insertions(+), 2 deletions(-) create mode 100644 daemon/xfs.c diff --git a/daemon/Makefile.am b/daemon/Makefile.am index 9e2a633..afe8874 100644 --- a/daemon/Makefile.am +++ b/daemon/Makefile.am @@ -165,6 +165,7 @@ guestfsd_SOURCES = \ utimens.c \ wc.c \ xattr.c \ + xfs.c \ zero.c \ zerofree.c guestfsd_LDADD = \ diff --git a/daemon/xfs.c b/daemon/xfs.c new file mode 100644 index 0000000..8b60b19 --- /dev/null +++ b/daemon/xfs.c @@ -0,0 +1,69 @@ +/* libguestfs - the guestfsd daemon + * Copyright (C) 2012 Fujitsu Limited. + * + * This program is free software; you can redistribute it an...

...325 insertions(+), 1 deletion(-) create mode 100644 daemon/xfs.c diff --git a/daemon/Makefile.am b/daemon/Makefile.am index 9e2a633..afe8874 100644 --- a/daemon/Makefile.am +++ b/daemon/Makefile.am @@ -165,6 +165,7 @@ guestfsd_SOURCES = \ utimens.c \ wc.c \ xattr.c \ + xfs.c \ zero.c \ zerofree.c guestfsd_LDADD = \ diff --git a/daemon/xfs.c b/daemon/xfs.c new file mode 100644 index 0000000..b328d09 --- /dev/null +++ b/daemon/xfs.c @@ -0,0 +1,278 @@ +/* libguestfs - the guestfsd daemon + * Copyright (C) 2012 Fujitsu Limited. + * + * This program is free software; you can redistribute it a...