cifs: use the expiry output of dns_query to schedule next resolution

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We recently fixed DNS resolution of the server hostname during reconnect.
However, server IP address may change, even when the old one continues
to server (although sub-optimally).

We should schedule the next DNS resolution based on the TTL of
the DNS record used for the last resolution. This way, we resolve the
server hostname again when a DNS record expires.

Signed-off-by: Shyam Prasad N <sprasad@microsoft.com>
Reviewed-by: Paulo Alcantara (SUSE) <pc@cjr.nz>
Cc: <stable@vger.kernel.org> # v5.11+
Signed-off-by: Steve French <stfrench@microsoft.com>

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This commit is contained in:

Shyam Prasad N 2021-05-18 15:05:50 +00:00 • committed by Steve French

parent e73f0f0ee7

commit 506c1da44f

6 changed files with 65 additions and 10 deletions

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2

fs/cifs/cifs_dfs_ref.c

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4

fs/cifs/cifsglob.h

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55

fs/cifs/connect.c

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10

fs/cifs/dns_resolve.c

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2

fs/cifs/dns_resolve.h

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2

fs/cifs/misc.c

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