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afs: Fix whole-volume callback handling

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It's possible for an AFS file server to issue a whole-volume notification
that callbacks on all the vnodes in the file have been broken.  This is
done for R/O and backup volumes (which don't have per-file callbacks) and
for things like a volume being taken offline.

Fix callback handling to detect whole-volume notifications, to track it
across operations and to check it during inode validation.

Fixes: c435ee3455 ("afs: Overhaul the callback handling")
Signed-off-by: David Howells <dhowells@redhat.com>
This commit is contained in:
David Howells
2018-05-12 22:31:33 +01:00
parent f9c1bba3d3
commit 68251f0a68
10 changed files with 63 additions and 32 deletions
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2
fs/afs/fsclient.c
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@@ -261,7 +261,7 @@ static void xdr_decode_AFSCallBack(struct afs_call *call,
write_seqlock(&vnode->cb_lock);
if (call->cb_break == (vnode->cb_break + cbi->server->cb_s_break)) {
if (call->cb_break == afs_cb_break_sum(vnode, cbi)) {
vnode->cb_version = ntohl(*bp++);
cb_expiry = ntohl(*bp++);
vnode->cb_type = ntohl(*bp++);