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Describe the motivation and basic principle of the clients change
detection mode and show an example invocation.
Signed-off-by: Christian Ebner <c.ebner@proxmox.com>
The lookahead cache size requires the resource limit for open file
handles to be high in order to allow for efficient reuse of unchanged
file payloads.
Increase the nofile soft limit to the hard limit and dynamically adapt
the cache size to the new soft limit minus the half of the previous
soft limit.
The `PxarCreateOptions` and the `Archiver` are therefore extended by
an additional field to store the maximum cache size, with fallback to
a default size of 512 entries.
Signed-off-by: Christian Ebner <c.ebner@proxmox.com>
The default soft limit for open file handles is rather low, as some
apis (e.g. the POSIX `select(2)` syscall) do not work [0].
The lookahead cache use during the backup clients metadata comparison
to reuse unchanged files however requires much higher limits to work
effectively.
This helper function allows to raise the soft limit to the hard
limit, as provided by the `getrlimit(2)` syscall.
[0] https://0pointer.net/blog/file-descriptor-limits.html
Suggested-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
Signed-off-by: Christian Ebner <c.ebner@proxmox.com>
Use the dedicated chunker with boundary suggestions for the payload
stream, by attaching the channel sender to the archiver and the
channel receiver to the payload stream chunker.
The archiver sends the file boundaries for the chunker to consume.
Signed-off-by: Christian Ebner <c.ebner@proxmox.com>
Implement the Chunker trait for a dedicated payload stream chunker,
which extends the regular chunker by the option to suggest boundaries
to be used over the hast based boundaries whenever possible.
Signed-off-by: Christian Ebner <c.ebner@proxmox.com>
Add the Chunker trait and move the current Chunker to ChunkerImpl to
implement the trait instead. This allows to use different chunker
implementations by dynamic dispatch and is in preparation for
implementing a dedicated payload chunker.
Signed-off-by: Christian Ebner <c.ebner@proxmox.com>
Allow to pass an optional input path to mount a split pxar archive
with dedicated payload data file.
Signed-off-by: Christian Ebner <c.ebner@proxmox.com>
Do not list the pxar format version and the prelude entries in the
output of pxar list, these are not regular entries. Do include them
however when dumping with the debug environmet variable set.
Since the prelude is arbitrary in size, only show the content size.
Signed-off-by: Christian Ebner <c.ebner@proxmox.com>
In addition to the entries, also show the padding encountered in-between
referenced payloads.
Example invocation: `PXAR_LOG=debug pxar list archive.mpxar`
Signed-off-by: Christian Ebner <c.ebner@proxmox.com>
Pxar archives allow to store additional information in a prelude
entry since pxar format version 2.
Add an optional parameter to `pxar` and `proxmox-backup-client` to
specify the path to restore the prelude to and pass this to the
archive extraction by extending the `PxarExtractOptions` by a
corresponding field. If none is given, the prelude is simply skipped
during restore.
Signed-off-by: Christian Ebner <c.ebner@proxmox.com>
Instead of encoding the pxar cli exclude patterns as regular file
within the root directory of an archive, store this information
directly after the pxar format version entry in the entry of kind
Prelude.
This behavior is however currently exclusive to the archives written
with format version 2 in a split metadata and payload case.
This is a breaking change for the encoding of new cli exclude
parameters. Any new exclude parameter will not be added to an already
present .pxar-cliexclude file, and it will not be created if not
present.
Signed-off-by: Christian Ebner <c.ebner@proxmox.com>
Pxar archives with format version 2 allows to store optional
information file format version and prelude entries.
Cover the case for these entries, the file format version entry being
introduced to distinguish between different file formats used for
encoding as well as the prelude entry used to store optional metadata
such as the pxar cli exlude parameters.
Add the logic to accept and decode these prelude entries when
accessing the archive via a decoder instance.
For now simply ignore them.
Signed-off-by: Christian Ebner <c.ebner@proxmox.com>
With the additional output in case of split pxar archives, the upload
statistics logged by the backup writer following a backup are crowded
and hard to read.
Make the output more concise by merging the currenlty 2 lines per
upload stream, shown as e.g.:
```
data.ppxar: had to backup 4 MiB of 10.943 GiB (compressed 159 B) in 49.30s
data.ppxar: average backup speed: 83.09 KiB/s
```
into a single line, shown as e.g.:
```
data.ppxar: had to back up 4 MiB of 10.943 GiB (159 B compressed) in 49.30 s (average 83.09 KiB/s)
```
Signed-off-by: Christian Ebner <c.ebner@proxmox.com>
When walking the file system tree, check for each entry if it is
reusable, meaning that the metadata did not change and the payload
chunks can be reindexed instead of reencoding the whole data.
If the metadata matched, the range of the dynamic index entries for
that file are looked up in the previous payload data index.
Use the range and possible padding introduced by partial reuse of
chunks to decide whether to reuse the dynamic entries and encode
the file payloads as payload reference right away or cache the entry
for now and keep looking ahead.
If however a non-reusable (because changed) entry is encountered
before the padding threshold is reached, the entries on the cache are
flushed to the archive by reencoding them, resetting the cached state.
Reusable chunk digests and size as well as reference offsets to the
start of regular files payloads within the payload stream are injected
into the backup stream by sending them to the chunker via a dedicated
channel, forcing a chunk boundary and inserting the chunks.
If the threshold value for reuse is reached, the chunks are injected
in the payload stream and the references with the corresponding
offsets encoded in the metadata stream.
Since multiple files might be contained within a single chunk, it is
assured that the deduplication of chunks is performed, by keeping back
the last chunk, so following files might as well reuse that same
chunk without double indexing it. It is assured that this chunk is
injected in the stream also in case that the following lookups lead to
a cache clear and reencoding.
Directory boundaries are cached as well, and written as part of the
encoding when flushing.
Signed-off-by: Christian Ebner <c.ebner@proxmox.com>
Move the catalog directory start and end encoding from `add_entry`
to the `add_directory`, the latter being called by the previous.
By this, the `add_entry` method can be reused to walk the filesystem
tree in the context of an enabled lookahead cache without encoding
anything.
No functional change intended.
Signed-off-by: Christian Ebner <c.ebner@proxmox.com>
Add a lookahead cache and the neccessary types to store the required
data and keep track of directory boundaries while traversing the
filesystem tree, in order to postpone a decision if to reuse or
reencode a given regular file with unchanged metadata.
Signed-off-by: Christian Ebner <c.ebner@proxmox.com>
Add method to compare metadata of current file entry against metadata
of the entry looked up in the previous backup snapshot. If the
metadata matched, the start offset pointing to the files payload
header in the payload steam is returned.
This is in preparation for reusing payload chunks for unchanged files.
Signed-off-by: Christian Ebner <c.ebner@proxmox.com>
Implement a method that prepares the decoder instance to access a
previous snapshots metadata index and payload index in order to
pass it to the pxar archiver. The archiver than can utilize these
to compare the metadata for files to the previous state and gather
reusable chunks.
Signed-off-by: Christian Ebner <c.ebner@proxmox.com>
Adds the specification for switching the detection mode used to
identify regular files which changed since a reference backup run.
Signed-off-by: Christian Ebner <c.ebner@proxmox.com>
To reuse dynamic entries of a previous backup run and index them for
the new snapshot. Adds a non-blocking channel between the pxar
archiver and the chunk stream, as well as the chunk stream and the
backup writer.
The archiver sends forced boundary positions and the dynamic
entries to inject into the chunk stream following this boundary.
The chunk stream consumes this channel inputs as receiver whenever a
new chunk is requested by the upload stream, forcing a non-regular
chunk boundary in the pxar stream at the requested positions.
The dynamic entries to inject and the boundary are then send via the
second asynchronous channel to the backup writer's upload stream,
indexing them by inserting the dynamic entries as known chunks into
the upload stream.
Signed-off-by: Christian Ebner <c.ebner@proxmox.com>
When forcing a boundary, the internal chunker state is not in sync
with the chunk stream anymore. The reset method therefore allows
to reset the internal state.
Signed-off-by: Christian Ebner <c.ebner@proxmox.com>
Adds a dedicated structure to hold the optional sender and receiver
instances and state for injection of reused dynamic entries in the
payload stream for split stream pxar archives.
The asynchronous channels must only be attached to the payload
archive, leaving the current behavior for the metadata archive and
current default encoding without reusing payload chunks of previous
snapshots.
Signed-off-by: Christian Ebner <c.ebner@proxmox.com>
In order to be included in the backups index file, reused payload
chunks have to be injected into the payload upload stream at a
forced boundary. The chunker forces a chunk boundary and sends the
list of reusable dynamic entries to be uploaded.
This implements the logic to receive these dynamic entries via the
corresponding communication channel from the chunker and inject the
entries into the backup upload stream by looking for the matching
chunk boundary, already forced by the chunker.
Signed-off-by: Christian Ebner <c.ebner@proxmox.com>
The helper method allows to lookup the entries of a dynamic index
which fully cover a given offset range. Further, the helper returns
the start padding from the start offset of the dynamic index entry
to the start offset of the given range and the end padding.
This will be used to lookup size and digest for chunks covering the
payload range of a regular file in order to re-use found chunks by
indexing them in the archives index file instead of re-encoding the
payload.
Signed-off-by: Christian Ebner <c.ebner@proxmox.com>
Also display the payload offset as listing output when the regular file
entry had a payload reference rather than the payload encoded in the
archive. This allows for debugging by inspecting the raw payload data
file at given offset.
Signed-off-by: Christian Ebner <c.ebner@proxmox.com>
Allows to list entries of split pxar archives. As the decoder skips
over the file payloads, the corresponding payload file has to be
provided. Otherwise the decoder would skip inside the metadata
archive, leading to incorrect decoding.
Signed-off-by: Christian Ebner <c.ebner@proxmox.com>
Allows to pass the optional payload input to restore for cases where the
regular file payloads are stored in the split archive.
Signed-off-by: Christian Ebner <c.ebner@proxmox.com>
Attach the payload data archive as input stream to the decoder
and accessor instances for split archives.
Allows to restore contents from split archives via the
`proxmox-file-restore extract` command, by passing the metadata
archive name.
Signed-off-by: Christian Ebner <c.ebner@proxmox.com>
Factor out the logic to get the pxar reader into a dedicated function
so it can be reused to get the payload data archive reader instance.
Signed-off-by: Christian Ebner <c.ebner@proxmox.com>
Cover the additional `.mpxar` for metadata archive and `.ppxar` for
the payload data for pxar archives written as split archive.
Signed-off-by: Christian Ebner <c.ebner@proxmox.com>
Allows to access the pxar metadata archives for navigation and
download via the Proxmox Backup Server web ui.
Signed-off-by: Christian Ebner <c.ebner@proxmox.com>
Cover the cases where the pxar archive was uploaded as split payload
data and metadata streams. Instantiate the required reader and
decoder instances to access the metadata and payload data archives,
using the corresponding helper methods.
Allows to restore split metadata and payload stream pxar archives via
the catalog shell.
Signed-off-by: Christian Ebner <c.ebner@proxmox.com>
Attach the payload chunk reader for pxar archives which have been
uploaded using split streams for metadata and payload data.
Signed-off-by: Christian Ebner <c.ebner@proxmox.com>
Cover the cases where the pxar archive was uploaded as split payload
data and metadata streams. Instantiate the required reader and
decoder instances to access the metadata and payload data archives.
Signed-off-by: Christian Ebner <c.ebner@proxmox.com>
Cover the additional `.mpxar` for metadata archive and `.ppxar` for
the payload data file in the cli parameter completion callback.
Signed-off-by: Christian Ebner <c.ebner@proxmox.com>
Whenever a split pxar archive is encountered, instantiate and attach
the required dedicated reader instance to the decoder instance on
restore.
Piping the output to stdout is not possible for these, as this would
require a decoder instance which can decode the input stream, while
maintaining the pxar stream format as output.
Signed-off-by: Christian Ebner <c.ebner@proxmox.com>
With the introduction of split pxar archives, the allowed extensions
are now `.pxar`, `.mpxar` and `.ppxar`. Add a helper function to
allow to check for all valid variants, including the optional
additional `.didx` in case of a server archive name.
Signed-off-by: Christian Ebner <c.ebner@proxmox.com>
Helper method that takes an archive name as input and checks if the
given archive is present in the manifest, by also taking possible
split archive extensions into account.
Returns the pxar archive name if found or the split archive names if
the split archive variant is present in the manifest.
If neither is matched, an error is returned signaling that nothing
matched entries in the manifest.
Signed-off-by: Christian Ebner <c.ebner@proxmox.com>
Add module to place helper methods which need to be used in different
submodules of the client.
Add `get_pxar_fuse_reader`, `get_buffered_pxar_reader` and
`get_pxar_fuse_accessor` to create reader instances to access pxar
archives.
Signed-off-by: Christian Ebner <c.ebner@proxmox.com>
