Patch series "nilfs2: prevent unexpected ENOENT propagation".
This series fixes potential issues where the result code -ENOENT, which is
returned internally when a metadata file operation encouters a hole block,
is exposed to user space without being properly handled.
Several issues with the same cause leading to hangs or WARN_ON check
failures have been reported by syzbot and fixed each time in the past.
This collectively fixes the missing -ENOENT conversions that do not cause
stability issues and are not covered by syzbot.
This patch (of 5):
The sufile, a metadata file that holds metadata for segment management,
has statistical information in its first block, but if reading this block
fails, it receives the internal code -ENOENT and returns it unchanged to
the callers.
To prevent this -ENOENT from being propagated to system calls, if reading
the header block fails, return -EIO (or -EINVAL depending on the context)
instead.
Link: https://lkml.kernel.org/r/20240821154627.11848-1-konishi.ryusuke@gmail.com
Link: https://lkml.kernel.org/r/20240821154627.11848-2-konishi.ryusuke@gmail.com
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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