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xfs: create temporary files for online repair [v30.3 04/16]

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As mentioned earlier, the repair strategy for file-based metadata is to
 build a new copy in a temporary file and swap the file fork mappings
 with the metadata inode.  We've built the atomic extent swap facility,
 so now we need to build a facility for handling private temporary files.
 
 The first step is to teach the filesystem to ignore the temporary files.
 We'll mark them as PRIVATE in the VFS so that the kernel security
 modules will leave it alone.  The second step is to add the online
 repair code the ability to create a temporary file and reap extents from
 the temporary file after the extent swap.
 
 This has been running on the djcloud for months with no problems.  Enjoy!
 
 Signed-off-by: Darrick J. Wong <djwong@kernel.org>
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Merge tag 'repair-tempfiles-6.10_2024-04-15' of https://git.kernel.org/pub/scm/linux/kernel/git/djwong/xfs-linux into xfs-6.10-mergeA

xfs: create temporary files for online repair

As mentioned earlier, the repair strategy for file-based metadata is to
build a new copy in a temporary file and swap the file fork mappings
with the metadata inode.  We've built the atomic extent swap facility,
so now we need to build a facility for handling private temporary files.

The first step is to teach the filesystem to ignore the temporary files.
We'll mark them as PRIVATE in the VFS so that the kernel security
modules will leave it alone.  The second step is to add the online
repair code the ability to create a temporary file and reap extents from
the temporary file after the extent swap.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Chandan Babu R <chandanbabu@kernel.org>

* tag 'repair-tempfiles-6.10_2024-04-15' of https://git.kernel.org/pub/scm/linux/kernel/git/djwong/xfs-linux:
  xfs: add the ability to reap entire inode forks
  xfs: refactor live buffer invalidation for repairs
  xfs: create temporary files and directories for online repair
  xfs: hide private inodes from bulkstat and handle functions
This commit is contained in:
Chandan Babu R 2024-04-16 11:40:13 +05:30
commit 783c51708b
14 changed files with 843 additions and 26 deletions
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