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author | Theodore Ts'o <tytso@mit.edu> | 2018-12-30 23:20:39 -0500 |
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committer | Theodore Ts'o <tytso@mit.edu> | 2018-12-30 23:20:39 -0500 |
commit | e86807862e6880809f191c4cea7f88a489f0ed34 (patch) | |
tree | ee5fc629e5094ca12266b9fce0118f5ae469561a /crypto | |
parent | 2b08b1f12cd664dc7d5c84ead9ff25ae97ad5491 (diff) | |
download | linux-e86807862e6880809f191c4cea7f88a489f0ed34.tar.bz2 |
ext4: avoid kernel warning when writing the superblock to a dead device
The xfstests generic/475 test switches the underlying device with
dm-error while running a stress test. This results in a large number
of file system errors, and since we can't lock the buffer head when
marking the superblock dirty in the ext4_grp_locked_error() case, it's
possible the superblock to be !buffer_uptodate() without
buffer_write_io_error() being true.
We need to set buffer_uptodate() before we call mark_buffer_dirty() or
this will trigger a WARN_ON. It's safe to do this since the
superblock must have been properly read into memory or the mount would
have been successful. So if buffer_uptodate() is not set, we can
safely assume that this happened due to a failed attempt to write the
superblock.
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@vger.kernel.org
Diffstat (limited to 'crypto')
0 files changed, 0 insertions, 0 deletions