[pbs-devel] [PATCH proxmox-backup 2/2] partially fix #2915: 'stat' in case ReadDirEntry does not contain type
Fabian Grünbichler
f.gruenbichler at proxmox.com
Tue Jun 28 13:47:30 CEST 2022
On June 28, 2022 1:13 pm, Dominik Csapak wrote:
> readdir/getdents may return 'DT_UNKNOWN' for the file type
> (which corresponds to 'None' in nix::dir::Entry), so stat the file and
> check the type
>
> Signed-off-by: Dominik Csapak <d.csapak at proxmox.com>
> ---
> pbs-datastore/src/chunk_store.rs | 23 ++++++-------
> pbs-datastore/src/hierarchy.rs | 56 ++++++++++++++++++++++++++++++++
> 2 files changed, 66 insertions(+), 13 deletions(-)
>
> diff --git a/pbs-datastore/src/chunk_store.rs b/pbs-datastore/src/chunk_store.rs
> index c9714c1e..2c281b0c 100644
> --- a/pbs-datastore/src/chunk_store.rs
> +++ b/pbs-datastore/src/chunk_store.rs
> @@ -375,24 +375,21 @@ impl ChunkStore {
> ),
> };
>
> - let file_type = match entry.file_type() {
> - Some(file_type) => file_type,
> - None => bail!(
> - "unsupported file system type on chunk store '{}'",
> - self.name
> - ),
> - };
> - if file_type != nix::dir::Type::File {
> - continue;
> - }
> -
> - chunk_count += 1;
> -
> let filename = entry.file_name();
>
> let lock = self.mutex.lock();
>
> if let Ok(stat) = fstatat(dirfd, filename, nix::fcntl::AtFlags::AT_SYMLINK_NOFOLLOW) {
> + if match entry.file_type() {
> + Some(file_type) => file_type != nix::dir::Type::File,
> + None => stat.st_mode & libc::S_IFREG == 0,
nit: since we need the stat here anyway, this could just drop the
entry.file_type() altogether?
> + } {
> + drop(lock);
> + continue;
> + }
> +
> + chunk_count += 1;
> +
> if stat.st_atime < min_atime {
> //let age = now - stat.st_atime;
> //println!("UNLINK {} {:?}", age/(3600*24), filename);
> diff --git a/pbs-datastore/src/hierarchy.rs b/pbs-datastore/src/hierarchy.rs
> index d5007b07..a97a1d2a 100644
> --- a/pbs-datastore/src/hierarchy.rs
> +++ b/pbs-datastore/src/hierarchy.rs
> @@ -9,6 +9,16 @@ use pbs_api_types::{BackupNamespace, BackupType, BACKUP_DATE_REGEX, BACKUP_ID_RE
> use crate::backup_info::{BackupDir, BackupGroup};
> use crate::DataStore;
>
> +fn dir_entry_is_path(entry: &proxmox_sys::fs::ReadDirEntry) -> Result<bool, Error> {
> + let stat = nix::sys::stat::fstatat(
> + entry.parent_fd(),
> + entry.file_name(),
> + nix::fcntl::AtFlags::AT_SYMLINK_NOFOLLOW,
> + )?;
> + let is_dir = stat.st_mode & libc::S_IFDIR > 0;
> + Ok(is_dir)
> +}
nit: why *is_path*? everything's a path ;) this should probably be called
`dir_entry_is_dir` or `dir_entry_is_subdir`?
we could also re-use the matching from proxmox_sys -> have a helper that
takes an entry, returns the file_type if possible, stats otherwise (the
parent fd and name are in the entry after all), returns the stat result
transposed to Option<FileType> (or change the call sites to expect
Result<FileType>), if we want to support this across the board a single
place for the stat implementation is probably better than multiple
ones..
> +
> /// A iterator for all BackupDir's (Snapshots) in a BackupGroup
> pub struct ListSnapshots {
> group: BackupGroup,
> @@ -36,6 +46,17 @@ impl Iterator for ListSnapshots {
> Ok(ref entry) => {
> match entry.file_type() {
> Some(nix::dir::Type::Directory) => entry, // OK
> + None => match dir_entry_is_path(&entry) {
> + Ok(true) => entry,
> + Ok(false) => continue,
> + Err(err) => {
> + log::info!(
> + "error listing snapshots for {}: {err}",
> + self.group.group()
> + );
> + continue;
> + }
> + },
> _ => continue,
> }
> }
> @@ -93,6 +114,17 @@ impl Iterator for ListGroups {
> Ok(ref entry) => {
> match entry.file_type() {
> Some(nix::dir::Type::Directory) => entry, // OK
> + None => match dir_entry_is_path(&entry) {
> + Ok(true) => entry,
> + Ok(false) => continue,
> + Err(err) => {
> + log::info!(
> + "error listing groups for {}: {err}",
> + self.store.name()
> + );
> + continue;
> + }
> + },
> _ => continue,
> }
> }
> @@ -114,6 +146,17 @@ impl Iterator for ListGroups {
> Ok(ref entry) => {
> match entry.file_type() {
> Some(nix::dir::Type::Directory) => entry, // OK
> + None => match dir_entry_is_path(&entry) {
> + Ok(true) => entry,
> + Ok(false) => continue,
> + Err(err) => {
> + log::info!(
> + "error listing groups for {}: {err}",
> + self.store.name()
> + );
> + continue;
> + }
> + },
> _ => continue,
> }
> }
> @@ -176,6 +219,19 @@ impl Iterator for ListNamespaces {
> Ok(ref entry) => {
> match entry.file_type() {
> Some(nix::dir::Type::Directory) => entry, // OK
> + None => match dir_entry_is_path(&entry) {
> + Ok(true) => entry,
> + Ok(false) => continue,
> + Err(err) => {
> + let mut base_path = self.base_path.to_owned();
> + if !self.ns.is_root() {
> + base_path.push(self.ns.path());
> + }
> + base_path.push("ns");
> + log::info!("error listing dirs in {:?}: {err}", base_path);
> + continue;
> + }
> + },
> _ => continue,
> }
> }
> --
> 2.30.2
>
>
>
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