smb3: fix temporary data corruption in collapse range

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collapse range doesn't discard the affected cached region
so can risk temporarily corrupting the file data. This
fixes xfstest generic/031

I also decided to merge a minor cleanup to this into the same patch
(avoiding rereading inode size repeatedly unnecessarily) to make it
clearer.

Cc: stable@vger.kernel.org
Fixes: 5476b5dd82 ("cifs: add support for FALLOC_FL_COLLAPSE_RANGE")
Reported-by: David Howells <dhowells@redhat.com>
Tested-by: David Howells <dhowells@redhat.com>
Reviewed-by: David Howells <dhowells@redhat.com>
cc: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>

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This commit is contained in:

Steve French 2022-08-23 14:07:41 +01:00

parent c3a72bb213

commit fa30a81f25

1 changed files with 16 additions and 10 deletions

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26

fs/cifs/smb2ops.c

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