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966ceafc |
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15-Apr-2024 |
Darrick J. Wong <djwong@kernel.org> |
xfs: create deferred log items for file mapping exchanges Now that we've created the skeleton of a log intent item to track and restart file mapping exchange operations, add the upper level logic to commit intent items and turn them into concrete work recorded in the log. This builds on the existing bmap update intent items that have been around for a while now. Signed-off-by: Darrick J. Wong <djwong@kernel.org> Reviewed-by: Christoph Hellwig <hch@lst.de>
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9a64d9b3 |
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15-Apr-2024 |
Darrick J. Wong <djwong@kernel.org> |
xfs: introduce new file range exchange ioctl Introduce a new ioctl to handle exchanging ranges of bytes between files. The goal here is to perform the exchange atomically with respect to applications -- either they see the file contents before the exchange or they see that A-B is now B-A, even if the kernel crashes. My original goal with all this code was to make it so that online repair can build a replacement directory or xattr structure in a temporary file and commit the repair by atomically exchanging all the data blocks between the two files. However, I needed a way to test this mechanism thoroughly, so I've been evolving an ioctl interface since then. Signed-off-by: Darrick J. Wong <djwong@kernel.org> Reviewed-by: Christoph Hellwig <hch@lst.de>
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