From: Thomas Lamprecht <t.lamprecht@proxmox.com>
To: Proxmox Backup Server development discussion
<pbs-devel@lists.proxmox.com>,
Gabriel Goller <g.goller@proxmox.com>
Subject: Re: [pbs-devel] [PATCH proxmox-backup] fix #4823: datastore: ignore vanished files when walking directory
Date: Thu, 7 Sep 2023 17:05:14 +0200 [thread overview]
Message-ID: <482af171-fcb0-4dc6-b662-66d1511fc4a3@proxmox.com> (raw)
In-Reply-To: <20230905093747.54879-1-g.goller@proxmox.com>
On 05/09/2023 11:37, Gabriel Goller wrote:
> When walking through a datastore on a GC run, it can
> happen that the snapshot is deleted, and then walked over.
> For example:
> - read dir entry for group
> - walk entries (snapshots)
> - snapshot X is removed/pruned
> - walking reaches snapshot X, but ENOENT
> Previously we bailed here, now we just ignore it.
>
looks mostly fine, some style nits and a actual comment inline.
> Signed-off-by: Gabriel Goller <g.goller@proxmox.com>
> ---
> pbs-datastore/src/datastore.rs | 28 +++++++++++++++++-----------
> 1 file changed, 17 insertions(+), 11 deletions(-)
>
> diff --git a/pbs-datastore/src/datastore.rs b/pbs-datastore/src/datastore.rs
> index fe75d9b5..d135ad90 100644
> --- a/pbs-datastore/src/datastore.rs
> +++ b/pbs-datastore/src/datastore.rs
> @@ -869,18 +869,24 @@ impl DataStore {
> let handle_entry_err = |err: walkdir::Error| {
> if let Some(inner) = err.io_error() {
> if let Some(path) = err.path() {
> - if inner.kind() == io::ErrorKind::PermissionDenied {
> - // only allow to skip ext4 fsck directory, avoid GC if, for example,
> - // a user got file permissions wrong on datastore rsync to new server
> - if err.depth() > 1 || !path.ends_with("lost+found") {
> - bail!("cannot continue garbage-collection safely, permission denied on: {:?}", path)
> + match inner.kind() {
> + io::ErrorKind::PermissionDenied => {
that's some deep indentation level.. not a must, but maybe you find
some good/simple way to refactor some of this to make it a bit less
crowded here (if, then in a separate patch please)
> + // only allow to skip ext4 fsck directory, avoid GC if, for example,
> + // a user got file permissions wrong on datastore rsync to new server
> + if err.depth() > 1 || !path.ends_with("lost+found") {
> + bail!("cannot continue garbage-collection safely, permission denied on: {:?}", path)
> + }
> + }
> + io::ErrorKind::NotFound => {
> + // ignore vanished file
would be still good to log that here, at least at debug level
if it can be noisy; but as there wasn't many that run into this
in the four years of PBS existing I'd guess a always visible
level is fine as long as the log message doesn't sounds scary.
> + }
> + _ => {
> + bail!(
> + "unexpected error on datastore traversal: {} - {:?}",
> + inner,
> + path
as already mentioned once, please use captured variables directly
in the format strings for new additions or lines that you touch anyway.
E.g.:
bail!("unexpected error on datastore traversal: {inner} - {path:?}")
> + )
> }
> - } else {
> - bail!(
> - "unexpected error on datastore traversal: {} - {:?}",
> - inner,
> - path
> - )
same here
> }
> } else {
> bail!("unexpected error on datastore traversal: {}", inner)
next prev parent reply other threads:[~2023-09-07 15:05 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-09-05 9:37 Gabriel Goller
2023-09-07 15:05 ` Thomas Lamprecht [this message]
2023-09-08 7:41 ` Gabriel Goller
2023-09-08 9:36 ` Thomas Lamprecht
2023-09-08 12:56 ` Gabriel Goller
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