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| author | David Howells <dhowells@redhat.com> | 2018-05-12 22:31:33 +0100 |
|---|---|---|
| committer | David Howells <dhowells@redhat.com> | 2018-05-14 15:15:18 +0100 |
| commit | 68251f0a6818f3be19b1471f36c956ca97c1427d (patch) | |
| tree | 1e4fb0cacb40aff37e9f0177a772c6509631afec /fs/afs/security.c | |
| parent | f9c1bba3d392843f046d2ee27b4dfcec989d8a4b (diff) | |
| download | linux-68251f0a6818f3be19b1471f36c956ca97c1427d.tar.gz linux-68251f0a6818f3be19b1471f36c956ca97c1427d.tar.bz2 linux-68251f0a6818f3be19b1471f36c956ca97c1427d.zip | |
afs: Fix whole-volume callback handling
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: c435ee34551e ("afs: Overhaul the callback handling")
Signed-off-by: David Howells <dhowells@redhat.com>
Diffstat (limited to 'fs/afs/security.c')
| -rw-r--r-- | fs/afs/security.c | 7 |
1 files changed, 3 insertions, 4 deletions
diff --git a/fs/afs/security.c b/fs/afs/security.c index cea2fff313dc..1992b0ffa543 100644 --- a/fs/afs/security.c +++ b/fs/afs/security.c @@ -147,8 +147,7 @@ void afs_cache_permit(struct afs_vnode *vnode, struct key *key, break; } - if (cb_break != (vnode->cb_break + - vnode->cb_interest->server->cb_s_break)) { + if (cb_break != afs_cb_break_sum(vnode, vnode->cb_interest)) { changed = true; break; } @@ -178,7 +177,7 @@ void afs_cache_permit(struct afs_vnode *vnode, struct key *key, } } - if (cb_break != (vnode->cb_break + vnode->cb_interest->server->cb_s_break)) + if (cb_break != afs_cb_break_sum(vnode, vnode->cb_interest)) goto someone_else_changed_it; /* We need a ref on any permits list we want to copy as we'll have to @@ -257,7 +256,7 @@ found: spin_lock(&vnode->lock); zap = rcu_access_pointer(vnode->permit_cache); - if (cb_break == (vnode->cb_break + vnode->cb_interest->server->cb_s_break) && + if (cb_break == afs_cb_break_sum(vnode, vnode->cb_interest) && zap == permits) rcu_assign_pointer(vnode->permit_cache, replacement); else |