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A mirror of the official Linux kernel repository just in case
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Ext4 may not free clusters correctly when punching holes in bigalloc file systems under high load conditions. If it's not possible to extend and restart the journal in ext4_ext_rm_leaf() when preparing to remove blocks from a punched region, a retry of the entire punch operation is triggered in ext4_ext_remove_space(). This causes a partial cluster to be set to the first cluster in the extent found to the right of the punched region. However, if the punch operation prior to the retry had made enough progress to delete one or more extents and a partial cluster candidate for freeing had already been recorded, the retry would overwrite the partial cluster. The loss of this information makes it impossible to correctly free the original partial cluster in all cases. This bug can cause generic/476 to fail when run as part of xfstests-bld's bigalloc and bigalloc_1k test cases. The failure is reported when e2fsck detects bad iblocks counts greater than expected in units of whole clusters and also detects a number of negative block bitmap differences equal to the iblocks discrepancy in cluster units. Signed-off-by: Eric Whitney <enwlinux@gmail.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu> |
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| include | ||
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| ipc | ||
| kernel | ||
| lib | ||
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| net | ||
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| .clang-format | ||
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| .get_maintainer.ignore | ||
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| README | ||
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.