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ceph: always queue a writeback when revoking the Fb caps 

In case there is 'Fw' dirty caps and 'CHECK_CAPS_FLUSH' is set we
will always ignore queue a writeback. Queue a writeback is very
important because it will block kclient flushing the snapcaps to
MDS and which will block MDS waiting for revoking the 'Fb' caps.

Link: https://tracker.ceph.com/issues/50223
Signed-off-by: Xiubo Li <xiubli@redhat.com>
Reviewed-by: Milind Changire <mchangir@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Xiubo Li 2023-09-13 16:18:34 +08:00 committed by Ilya Dryomov
parent 841c351693
commit 902d6d013f
1 changed files with 24 additions and 24 deletions
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48
fs/ceph/caps.c
View File

@ -2156,6 +2156,30 @@ retry:
ceph_cap_string(cap->implemented),
ceph_cap_string(revoking));
/* completed revocation? going down and there are no caps? */
if (revoking) {
if ((revoking & cap_used) == 0) {
doutc(cl, "completed revocation of %s\n",
ceph_cap_string(cap->implemented & ~cap->issued));
goto ack;
}
/*
* If the "i_wrbuffer_ref" was increased by mmap or generic
* cache write just before the ceph_check_caps() is called,
* the Fb capability revoking will fail this time. Then we
* must wait for the BDI's delayed work to flush the dirty
* pages and to release the "i_wrbuffer_ref", which will cost
* at most 5 seconds. That means the MDS needs to wait at
* most 5 seconds to finished the Fb capability's revocation.
*
* Let's queue a writeback for it.
*/
if (S_ISREG(inode->i_mode) && ci->i_wrbuffer_ref &&
(revoking & CEPH_CAP_FILE_BUFFER))
queue_writeback = true;
}
if (cap == ci->i_auth_cap &&
(cap->issued & CEPH_CAP_FILE_WR)) {
/* request larger max_size from MDS? */
@ -2183,30 +2207,6 @@ retry:
}
}
/* completed revocation? going down and there are no caps? */
if (revoking) {
if ((revoking & cap_used) == 0) {
doutc(cl, "completed revocation of %s\n",
ceph_cap_string(cap->implemented & ~cap->issued));
goto ack;
}
/*
* If the "i_wrbuffer_ref" was increased by mmap or generic
* cache write just before the ceph_check_caps() is called,
* the Fb capability revoking will fail this time. Then we
* must wait for the BDI's delayed work to flush the dirty
* pages and to release the "i_wrbuffer_ref", which will cost
* at most 5 seconds. That means the MDS needs to wait at
* most 5 seconds to finished the Fb capability's revocation.
*
* Let's queue a writeback for it.
*/
if (S_ISREG(inode->i_mode) && ci->i_wrbuffer_ref &&
(revoking & CEPH_CAP_FILE_BUFFER))
queue_writeback = true;
}
/* want more caps from mds? */
if (want & ~cap->mds_wanted) {
if (want & ~(cap->mds_wanted | cap->issued))