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From: Filip Schauer <f.schauer@proxmox.com>
To: pbs-devel@lists.proxmox.com
Subject: [pbs-devel] [PATCH backup v2 2/2] disks: wipe: only zero out the first 1 MiB
Date: Tue, 11 Feb 2025 17:26:39 +0100	[thread overview]
Message-ID: <20250211162639.141541-3-f.schauer@proxmox.com> (raw)
In-Reply-To: <20250211162639.141541-1-f.schauer@proxmox.com>

Reduce the number of MiB zeroed out at the start of the disk from 200 to
1. This should still be sufficient to remove any remaining signatures
missed by `wipefs`, preventing potential interference with later use of
the disk.

Signed-off-by: Filip Schauer <f.schauer@proxmox.com>
---
 src/tools/disks/mod.rs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/tools/disks/mod.rs b/src/tools/disks/mod.rs
index ad9df0b5..deee60a6 100644
--- a/src/tools/disks/mod.rs
+++ b/src/tools/disks/mod.rs
@@ -1145,7 +1145,7 @@ pub fn inititialize_gpt_disk(disk: &Disk, uuid: Option<&str>) -> Result<(), Erro
     Ok(())
 }
 
-/// Wipes all labels, the first 200 MiB and the last 4096 bytes of a disk/partition.
+/// Wipes all labels, the first 1 MiB and the last 4096 bytes of a disk/partition.
 /// If called with a partition, also sets the partition type to 0x83 'Linux filesystem'.
 pub fn wipe_blockdev(disk: &Disk) -> Result<(), Error> {
     let disk_path = match disk.device_path() {
@@ -1198,7 +1198,7 @@ pub fn zero_disk_start_and_end(disk: &Disk) -> Result<(), Error> {
         .custom_flags(libc::O_CLOEXEC | libc::O_DSYNC)
         .open(disk_path)
         .with_context(|| "failed to open device {disk_path:?} for writing")?;
-    let write_size = disk_size.min(200 * 1024 * 1024);
+    let write_size = disk_size.min(1024 * 1024);
     let zeroes = proxmox_io::boxed::zeroed(write_size as usize);
     file.write_all_at(&zeroes, 0)
         .with_context(|| "failed to wipe start of device {disk_path:?}")?;
-- 
2.39.5



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  parent reply	other threads:[~2025-02-11 16:26 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-02-11 16:26 [pbs-devel] [PATCH backup v2 0/2] fix #5946: disks: wipe: ensure GPT header backup is wiped Filip Schauer
2025-02-11 16:26 ` [pbs-devel] [PATCH backup v2 1/2] " Filip Schauer
2025-02-11 18:39   ` Thomas Lamprecht
2025-02-12 11:01     ` Filip Schauer
2025-02-11 16:26 ` Filip Schauer [this message]
2025-02-11 18:42   ` [pbs-devel] [PATCH backup v2 2/2] disks: wipe: only zero out the first 1 MiB Thomas Lamprecht
2025-02-12 10:24     ` Filip Schauer
2025-02-12 13:44       ` Thomas Lamprecht

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