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  • 7 commits
  • 28 files changed
  • 4 contributors

Commits on Mar 17, 2025

  1. Expose f_smgr to extensions for manual implementation 

    There are various reasons why one would want to create their own
implementation of a storage manager, among which are block-level compression,
encryption and offloading to cold storage. This patch is a first patch that
allows extensions to register their own SMgr.

Note, however, that this SMgr is not yet used - only the first SMgr to register
is used, and this is currently the md.c smgr. Future commits will include
facilities to select an SMgr for each tablespace.
    @MMeent
    MMeent authored and Commitfest Bot committed Mar 17, 2025
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  2. Allow extensions to override the global storage manager

    @tristan957
    tristan957 authored and Commitfest Bot committed Mar 17, 2025
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  3. Add checkpoint_create_hook 

    Allows an extension to hook into CheckPointCreate().
    @tristan957
    tristan957 authored and Commitfest Bot committed Mar 17, 2025
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  4. Add contrib/fsync_checker 

    fsync_checker is an extension which overrides the global storage manager
to check for volatile relations, those which have been written but not
synced to disk.
    @tristan957
    tristan957 authored and Commitfest Bot committed Mar 17, 2025
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  5. Refactor smgr API: mdcreate needs the old relfilelocator 

    With this change, mdcreate receives the old relfilelocator along
with the new for operations that create a new file for an existing
relation.

This is required for tde_heap in pg_tde.
    @dutow
    dutow authored and Commitfest Bot committed Mar 17, 2025
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  6. SMGR GUC variable and chaining 

    The overall goal of this commit is to introduce a user interface to
the previous SMGR patch.

The idea is to allow a simple configuration for multiple "modificator"
SMGRs similar to the fsync_checker in the original proposal.

* Extensions should be able to declare a named lists of SMGR implementations,
also specifying if the given SMGR is an "end" implementation for
actual storage, or if it is a modifier implementation for some other
purpose.
* Users should be able to specify a list of SMGRs: possibly multiple modifiers,
and one storage implementation at the end to configure how the
storage manager is constructed.

This commit introduces a new GUC variable, `smgr_chain`, which allows
users to configure multiple SMGR implementations: it is a comma separated list,
where the last entry most be a storage implementation, the others must be
modifiers. The default value of this variable is "md".

The internal storage manager API is also refactored to include an easy
way for SMGR implementations to support proper chaining. Modifier SMGR
implementations also only have to implement the functions they actually
change, and can leave everything else as empty (NULL). And with this
change we can make the functions of the md smgr static.

The fsync example extension is also modified to match the new API.
    @dutow
    dutow authored and Commitfest Bot committed Mar 17, 2025
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  7. [CF 5616] v4 - Extensible storage manager API 

    This branch was automatically generated by a robot using patches from an
email thread registered at:

https://commitfest.postgresql.org/patch/5616

The branch will be overwritten each time a new patch version is posted to
the thread, and also periodically to check for bitrot caused by changes
on the master branch.

Patch(es): https://www.postgresql.org/message-id/[email protected]
Author(s): Andreas Karlsson, Anastasia Lubennikova, Matthias van de Meent, Tristan Partin
    Commitfest Bot committed Mar 17, 2025
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