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tape: lock media_catalog file to to get a consistent view with load_catalog

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This commit is contained in:
Dietmar Maurer 2021-07-28 10:25:52 +02:00
parent 0d5e990a62
commit 7116a2d9da
1 changed files with 18 additions and 4 deletions
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18
src/tape/media_catalog.rs
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@ -231,7 +231,12 @@ impl MediaCatalog {
pending: Vec::new(),
};
let (found_magic_number, _) = me.load_catalog(&mut file, media_id.media_set_label.as_ref())?;
// Note: lock file, to get a consistent view with load_catalog
nix::fcntl::flock(file.as_raw_fd(), nix::fcntl::FlockArg::LockExclusive)?;
let result = me.load_catalog(&mut file, media_id.media_set_label.as_ref());
nix::fcntl::flock(file.as_raw_fd(), nix::fcntl::FlockArg::Unlock)?;
let (found_magic_number, _) = result?;
if !found_magic_number {
me.pending.extend(&Self::PROXMOX_BACKUP_MEDIA_CATALOG_MAGIC_1_1);
@ -372,9 +377,18 @@ impl MediaCatalog {
match self.file {
Some(ref mut file) => {
file.write_all(&self.pending)?;
let pending = &self.pending;
// Note: lock file, to get a consistent view with load_catalog
nix::fcntl::flock(file.as_raw_fd(), nix::fcntl::FlockArg::LockExclusive)?;
let result: Result<(), Error> = proxmox::try_block!({
file.write_all(pending)?;
file.flush()?;
file.sync_data()?;
Ok(())
});
nix::fcntl::flock(file.as_raw_fd(), nix::fcntl::FlockArg::Unlock)?;
result?;
}
None => bail!("media catalog not writable (opened read only)"),
}