| Commit message (Collapse) | Author | Age | Files | Lines |
|---|
| |
|
|
|
|
| |
This is mostly code motion, although the precise contract of this
function changes slightly to make it more generally useful
(cherry picked from commit 781857a86b3bc8238995a9212ea09aa368fc2fc9)
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
| |
Add an API for doing what virt-sparsify was doing: freeing up free
space in a filesystem.
The current implementation is simple-minded: we create a file, fill it
with zeroes until we run out of space, then delete the file. However
the description leaves it open to do a better implementation, eg.
using sparsification support that is currently being worked on in ext4
and qemu.
The implementation also sends progress notifications, which is an
advantage over the old 'dd' method.
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |
The presumption is that all file descriptors should be created with
the close-on-exec flag set. The only exception are file descriptors
that we want passed through to exec'd subprocesses (mainly pipes and
stdin/stdout/stderr).
For open calls, we pass O_CLOEXEC as an extra flag, eg:
fd = open ("foo", O_RDONLY|O_CLOEXEC);
This is a Linux-ism, but using a macro we can easily make it portable.
For sockets, similarly:
sock = socket (..., SOCK_STREAM|SOCK_CLOEXEC, ...);
For accepted sockets, we use the Linux accept4 system call which
allows flags to be supplied, but we use the Gnulib 'accept4' module to
make this portable.
For dup, dup2, we use the Linux dup3 system call, and the Gnulib
modules 'dup3' and 'cloexec'.
|
| |
|
|
| |
This fixes commit a2b3e0900ee14e5a49d526c24e22edefc3030f99.
|
| |
|
|
|
|
|
| |
Add the new api wipefs to erase the filesystem signatures
on a device but now erase any data.
Signed-off-by: Wanlong Gao <gaowanlong@cn.fujitsu.com>
|
| |
|
|
| |
Update all copyright dates to 2012.
|
| | |
|
| |
|
|
| |
Code motion.
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |
This code modifies zero, zero-device, is-zero, is-zero-device.
zero and zero-device are modified so that if the blocks of the device
already contain zeroes, then we don't write zeroes. The reason for
this is to avoid unnecessarily making the underlying storage
non-sparse or (in the qcow2 case) growing it.
is-zero and is-zero-device are modified so that zero detection is
faster. This is a nice side effect of making the first change.
Since avoiding unnecessary zeroing involves reading the blocks before
writing them, whereas before we just blindly wrote, this can be
slower. As you can see from the tests below, in the case where the
disk is sparse, it actually turns out to be faster, because we avoid
allocating the underlying blocks.
However in the case where the disk is non-sparse and full of existing
data, it is much slower. There might be a case for an API flag to
adjust whether or not we perform the zero check. I did not add this
flag because it is unlikely that the caller would have enough
information to be able to set the flag correctly.
(Elapsed time in seconds)
Format Test case Before After
Raw Sparse 16.4 5.3
Preallocated zero 17.0 18.8
Preallocated random 16.0 41.3
Qcow2 preallocation=off 18.7 5.6
preallocation=metadata 17.4 5.8
The current code uses a fixed block size of 4K for reading and
writing. I also tried the same tests with a block size of 64K but it
didn't make any significant difference.
(Thanks to Federico Simoncelli for suggesting this change)
|
| | |
|
| | |
|
| | |
|
| | |
|
| | |
|
| | |
|
| |
|
|
| |
* daemon/zero.c (do_zero): Detect write and close errors.
|
| |
|
|
|
|
|
|
|
|
| |
Nearly every file-related function in daemons/*.c is affected:
Remove this pair of statements from each affected do_* function:
- NEED_ROOT (return -1);
- ABS_PATH (dir, return -1);
and change the type of the corresponding parameter to "const char *".
* src/generator.ml: Emit NEED_ROOT just once, even when there are two or
more Pathname args.
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |
Then update each affected function, removing each uses of RESOLVE_DEVICE,
now that it's generated in caller from stub.c.
* daemon/blockdev.c (call_blockdev): Remove use of RESOLVE_DEVICE.
* daemon/devsparts.c (do_mkfs): Likewise.
* daemon/ext2.c (do_e2fsck_f, do_get_e2label, do_get_e2uuid): Likewise.
(do_resize2fs, do_set_e2label, do_set_e2uuid, do_tune2fs_l): Likewise.
* daemon/fsck.c (do_fsck): Likewise.
* daemon/grub.c (do_grub_install): Likewise.
* daemon/lvm.c (do_lvremove, do_pvcreate, do_pvremove): Likewise.
(do_pvresize): Likewise.
* daemon/mount.c (do_mount_vfs): Likewise.
* daemon/ntfs.c (do_ntfs_3g_probe): Likewise.
* daemon/scrub.c (do_scrub_device): Likewise.
* daemon/sfdisk.c (sfdisk, sfdisk_flag): Likewise.
* daemon/swap.c (do_mkswap, do_mkswap_L, do_mkswap_U): Likewise.
(do_swapoff_device, do_swapon_device): Likewise.
* daemon/zero.c (do_zero): Likewise.
* daemon/zerofree.c (do_zerofree): Likewise.
|
| |
|
|
|
|
| |
Use this command:
git grep -l -w IS_DEVICE|xargs perl -pi -e \
's/\b(?:IS_DEVICE)\b( \(.*?,) (.*?)\)/RESOLVE_DEVICE$1 return $2)/'
|
| | |
|
| | |
|
| |
|
