From 3b454c4945c756686e91d77eeefac80cb5d21baf Mon Sep 17 00:00:00 2001 From: Sage Weil Date: Thu, 10 Jun 2010 13:20:33 -0700 Subject: [PATCH] ceph: simplify caps revocation, fix for multimds The caps revocation should either initiate writeback, invalidateion, or call check_caps to ack or do the dirty work. The primary question is whether we can get away with only checking the auth cap or whether all caps need to be checked. The old code was doing...something else. At the very least, revocations from non-auth MDSs could break by triggering the "check auth cap only" case. Signed-off-by: Sage Weil --- fs/ceph/caps.c | 30 ++++++++++++++++++------------ 1 file changed, 18 insertions(+), 12 deletions(-) diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c index a5b5725931b..82ffde618af 100644 --- a/fs/ceph/caps.c +++ b/fs/ceph/caps.c @@ -2278,8 +2278,8 @@ static void handle_cap_grant(struct inode *inode, struct ceph_mds_caps *grant, * try to invalidate (once). (If there are dirty buffers, we * will invalidate _after_ writeback.) */ - if (((cap->issued & ~newcaps) & (CEPH_CAP_FILE_CACHE| - CEPH_CAP_FILE_LAZYIO)) && + if (((cap->issued & ~newcaps) & CEPH_CAP_FILE_CACHE) && + (newcaps & CEPH_CAP_FILE_LAZYIO) == 0 && !ci->i_wrbuffer_ref) { if (try_nonblocking_invalidate(inode) == 0) { revoked_rdcache = 1; @@ -2371,16 +2371,22 @@ static void handle_cap_grant(struct inode *inode, struct ceph_mds_caps *grant, /* revocation, grant, or no-op? */ if (cap->issued & ~newcaps) { - dout("revocation: %s -> %s\n", ceph_cap_string(cap->issued), - ceph_cap_string(newcaps)); - if ((used & ~newcaps) & CEPH_CAP_FILE_BUFFER) - writeback = 1; /* will delay ack */ - else if (dirty & ~newcaps) - check_caps = 1; /* initiate writeback in check_caps */ - else if (((used & ~newcaps) & (CEPH_CAP_FILE_CACHE| - CEPH_CAP_FILE_LAZYIO)) == 0 || - revoked_rdcache) - check_caps = 2; /* send revoke ack in check_caps */ + int revoking = cap->issued & ~newcaps; + + dout("revocation: %s -> %s (revoking %s)\n", + ceph_cap_string(cap->issued), + ceph_cap_string(newcaps), + ceph_cap_string(revoking)); + if (revoking & CEPH_CAP_FILE_BUFFER) + writeback = 1; /* initiate writeback; will delay ack */ + else if (revoking == CEPH_CAP_FILE_CACHE && + (newcaps & CEPH_CAP_FILE_LAZYIO) == 0 && + queue_invalidate) + ; /* do nothing yet, invalidation will be queued */ + else if (cap == ci->i_auth_cap) + check_caps = 1; /* check auth cap only */ + else + check_caps = 2; /* check all caps */ cap->issued = newcaps; cap->implemented |= newcaps; } else if (cap->issued == newcaps) { -- 2.39.3