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8e3ef44f9b
One missing piece of functionality in the inode record repair code is figuring out what to do with a file whose mode is so corrupt that we cannot tell us the type of the file. Originally this was done by guessing the mode from the ondisk inode contents, but Christoph didn't like that because it read from data fork block 0, which could be user controlled data. Therefore, I've replaced all that with a directory scanner that looks for any dirents that point to the file with the garbage mode. If so, the ftype in the dirent will tell us exactly what mode to set on the file. Since users cannot directly write to the ftype field of a dirent, this should be safe. 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+O1o2YRKO3ySh0YRpgUCZdlBYAAKCRBKO3ySh0YR pvYaAQCdHMP4V94sw+jI46FHgqBAEEuqZUjq8cHwZPrtDzZc5QEA4fsbzR8yXJsw imsHjftkRhSEav0LVXhPCbaFfphbUQ0= =O1cc -----END PGP SIGNATURE----- Merge tag 'repair-inode-mode-6.9_2024-02-23' of https://git.kernel.org/pub/scm/linux/kernel/git/djwong/xfs-linux into xfs-6.9-mergeC xfs: repair inode mode by scanning dirs One missing piece of functionality in the inode record repair code is figuring out what to do with a file whose mode is so corrupt that we cannot tell us the type of the file. Originally this was done by guessing the mode from the ondisk inode contents, but Christoph didn't like that because it read from data fork block 0, which could be user controlled data. Therefore, I've replaced all that with a directory scanner that looks for any dirents that point to the file with the garbage mode. If so, the ftype in the dirent will tell us exactly what mode to set on the file. Since users cannot directly write to the ftype field of a dirent, this should be safe. Signed-off-by: Darrick J. Wong <djwong@kernel.org> Signed-off-by: Chandan Babu R <chandanbabu@kernel.org> * tag 'repair-inode-mode-6.9_2024-02-23' of https://git.kernel.org/pub/scm/linux/kernel/git/djwong/xfs-linux: xfs: repair file modes by scanning for a dirent pointing to us xfs: create a macro for decoding ftypes in tracepoints xfs: create a predicate to determine if two xfs_names are the same xfs: create a static name for the dot entry too xfs: iscan batching should handle unallocated inodes too xfs: cache a bunch of inodes for repair scans xfs: stagger the starting AG of scrub iscans to reduce contention xfs: allow scrub to hook metadata updates in other writers xfs: implement live inode scan for scrub xfs: speed up xfs_iwalk_adjust_start a little bit |
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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 Restructured Text 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.