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9e6b93b727
This series employs atomic extent swapping to enable safe reconstruction of directory data. For now, XFS does not support reverse directory links (aka parent pointers), so we can only salvage the dirents of a directory and construct a new structure. Directory repair therefore consists of five main parts: First, we walk the existing directory to salvage as many entries as we can, by adding them as new directory entries to the repair temp dir. Second, we validate the parent pointer found in the directory. If one was not found, we scan the entire filesystem looking for a potential parent. Third, we use atomic extent swaps to exchange the entire data fork between the two directories. Fourth, we reap the old directory blocks as carefully as we can. To wrap up the directory repair code, we need to add to the regular filesystem the ability to free all the data fork blocks in a directory. This does not change anything with normal directories, since they must still unlink and shrink one entry at a time. However, this will facilitate freeing of partially-inactivated temporary directories during log recovery. The second half of this patchset implements repairs for the dotdot entries of directories. For now there is only rudimentary support for this, because there are no directory parent pointers, so the best we can do is scanning the filesystem and the VFS dcache for answers. This has been running on the djcloud for months with no problems. Enjoy! Signed-off-by: Darrick J. Wong <djwong@kernel.org> -----BEGIN PGP SIGNATURE----- iHUEABYKAB0WIQQ2qTKExjcn+O1o2YRKO3ySh0YRpgUCZh23UwAKCRBKO3ySh0YR piAGAP4hhYmBAiSGau5anRwUAFiELV2Irgz8k5oIGeWhg2m/kgEAn00d1rX8buLz ZQyYs1dSRtBpYs2EIZRTnnM2W4dYLQY= =2L3x -----END PGP SIGNATURE----- Merge tag 'repair-dirs-6.10_2024-04-15' of https://git.kernel.org/pub/scm/linux/kernel/git/djwong/xfs-linux into xfs-6.10-mergeA xfs: online repair of directories This series employs atomic extent swapping to enable safe reconstruction of directory data. For now, XFS does not support reverse directory links (aka parent pointers), so we can only salvage the dirents of a directory and construct a new structure. Directory repair therefore consists of five main parts: First, we walk the existing directory to salvage as many entries as we can, by adding them as new directory entries to the repair temp dir. Second, we validate the parent pointer found in the directory. If one was not found, we scan the entire filesystem looking for a potential parent. Third, we use atomic extent swaps to exchange the entire data fork between the two directories. Fourth, we reap the old directory blocks as carefully as we can. To wrap up the directory repair code, we need to add to the regular filesystem the ability to free all the data fork blocks in a directory. This does not change anything with normal directories, since they must still unlink and shrink one entry at a time. However, this will facilitate freeing of partially-inactivated temporary directories during log recovery. The second half of this patchset implements repairs for the dotdot entries of directories. For now there is only rudimentary support for this, because there are no directory parent pointers, so the best we can do is scanning the filesystem and the VFS dcache for answers. Signed-off-by: Darrick J. Wong <djwong@kernel.org> Signed-off-by: Chandan Babu R <chandanbabu@kernel.org> * tag 'repair-dirs-6.10_2024-04-15' of https://git.kernel.org/pub/scm/linux/kernel/git/djwong/xfs-linux: xfs: ask the dentry cache if it knows the parent of a directory xfs: online repair of parent pointers xfs: scan the filesystem to repair a directory dotdot entry xfs: online repair of directories xfs: inactivate directory data blocks |
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.