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| author | Ross Lagerwall <ross.lagerwall@citrix.com> | 2023-04-26 17:40:05 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-06-21 15:38:57 +0200 |
| commit | 1ba0925b48205e06c913db2da46d5abbda0b2bbb (patch) | |
| tree | 3cf4e43876638b6b14aafa4a11b7a9f97a0d0fd1 /scripts/gcc-plugins/gcc-generate-rtl-pass.h | |
| parent | 9a592589a30e8565d22b754e88dd86429eced2c1 (diff) | |
xen/blkfront: Only check REQ_FUA for writes
[ Upstream commit b6ebaa8100090092aa602530d7e8316816d0c98d ]
The existing code silently converts read operations with the
REQ_FUA bit set into write-barrier operations. This results in data
loss as the backend scribbles zeroes over the data instead of returning
it.
While the REQ_FUA bit doesn't make sense on a read operation, at least
one well-known out-of-tree kernel module does set it and since it
results in data loss, let's be safe here and only look at REQ_FUA for
writes.
Signed-off-by: Ross Lagerwall <ross.lagerwall@citrix.com>
Acked-by: Juergen Gross <jgross@suse.com>
Link: https://lore.kernel.org/r/20230426164005.2213139-1-ross.lagerwall@citrix.com
Signed-off-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'scripts/gcc-plugins/gcc-generate-rtl-pass.h')
0 files changed, 0 insertions, 0 deletions