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A simple device evacuate, remove, add test loop with concurrent shutdowns occasionally reproduces a problem where the filesystem fails to mount. The mount failure occurs because the filesystem was uncleanly shut down, yet no member device is marked for journal data in the superblock. An fsck detects the problem, restores the mark and allows the mount to proceed without further consistency issues. The reason for the lack of journal data marks is the gc mechanism invoked via bch2_journal_flush_device_pins() runs while the journal happens to be empty. This results in garbage collection of all journal replicas entries. Once the updated replicas table is written to the superblock, the filesystem is put in a transiently unrecoverable state until further journal data is written, because journal recovery expects to find at least one marked journal device whenever the filesystem is not otherwise marked clean (i.e. as on clean unmount). To fix this problem, update the journal replicas gc algorithm to always mark currently active journal replicas entries by writing to the journal. This ensures that only entries for devices that are no longer used for journaling are garbage collected, not just those that don't happen to currently hold journal data. This preserves the journal recovery invariant above and avoids putting the fs into a transiently unrecoverable state. Signed-off-by: Brian Foster <bfoster@redhat.com> Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev> |
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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.