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author | David Howells <dhowells@redhat.com> | 2024-04-02 12:11:35 +0300 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-04-10 17:36:00 +0300 |
commit | 0fdada1ef5b10ea73bf618d0498723c7860b5be9 (patch) | |
tree | b6311ac9ccff24322ce8574d165a3eaccc4cde02 /lib | |
parent | 0f28afed9f9d71a3f97df94b9691ac49f49ec887 (diff) | |
download | linux-0fdada1ef5b10ea73bf618d0498723c7860b5be9.tar.xz |
cifs: Fix caching to try to do open O_WRONLY as rdwr on server
[ Upstream commit e9e62243a3e2322cf639f653a0b0a88a76446ce7 ]
When we're engaged in local caching of a cifs filesystem, we cannot perform
caching of a partially written cache granule unless we can read the rest of
the granule. This can result in unexpected access errors being reported to
the user.
Fix this by the following: if a file is opened O_WRONLY locally, but the
mount was given the "-o fsc" flag, try first opening the remote file with
GENERIC_READ|GENERIC_WRITE and if that returns -EACCES, try dropping the
GENERIC_READ and doing the open again. If that last succeeds, invalidate
the cache for that file as for O_DIRECT.
Fixes: 70431bfd825d ("cifs: Support fscache indexing rewrite")
Signed-off-by: David Howells <dhowells@redhat.com>
cc: Steve French <sfrench@samba.org>
cc: Shyam Prasad N <nspmangalore@gmail.com>
cc: Rohith Surabattula <rohiths.msft@gmail.com>
cc: Jeff Layton <jlayton@kernel.org>
cc: linux-cifs@vger.kernel.org
cc: netfs@lists.linux.dev
cc: linux-fsdevel@vger.kernel.org
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'lib')
0 files changed, 0 insertions, 0 deletions