David Howells 0fdada1ef5 cifs: Fix caching to try to do open O_WRONLY as rdwr on server ... [ Upstream commit e9e62243a3 ] 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: 70431bfd82 ("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>		2024-04-10 16:36:00 +02:00
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client	cifs: Fix caching to try to do open O_WRONLY as rdwr on server	2024-04-10 16:36:00 +02:00
common	smb: client, common: fix fortify warnings	2024-01-20 11:51:38 +01:00
server	ksmbd: retrieve number of blocks using vfs_getattr in set_file_allocation_info	2024-04-03 15:28:31 +02:00
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