[Devel] [PATCH RHEL8 COMMIT] ms/nfsd: Don't add locks to closed or closing open stateids
Konstantin Khorenko
khorenko at virtuozzo.com
Wed Jun 2 19:48:07 MSK 2021
The commit is pushed to "branch-rh8-4.18.0-240.1.1.vz8.5.x-ovz" and will appear at https://src.openvz.org/scm/ovz/vzkernel.git
after rh8-4.18.0-240.1.1.vz8.5.34
------>
commit 4ec272a08b5ca90bb90fc7476825f148ac791951
Author: Vasily Averin <vvs at virtuozzo.com>
Date: Wed Jun 2 19:48:07 2021 +0300
ms/nfsd: Don't add locks to closed or closing open stateids
In NFSv4, the lock stateids are tied to the lockowner, and the open stateid,
so that the action of closing the file also results in either an automatic
loss of the locks, or an error of the form NFS4ERR_LOCKS_HELD.
In practice this means we must not add new locks to the open stateid
after the close process has been invoked. In fact doing so, can result
in the following panic:
kernel BUG at lib/list_debug.c:51!
invalid opcode: 0000 [#1] SMP NOPTI
CPU: 2 PID: 1085 Comm: nfsd Not tainted 5.6.0-rc3+ #2
Hardware name: VMware, Inc. VMware7,1/440BX Desktop Reference Platform, BIOS VMW71.00V.14410784.B64.1908150010 08/15/2019
RIP: 0010:__list_del_entry_valid.cold+0x31/0x55
Code: 1a 3d 9b e8 74 10 c2 ff 0f 0b 48 c7 c7 f0 1a 3d 9b e8 66 10 c2 ff 0f 0b 48 89 f2 48 89 fe 48 c7 c7 b0 1a 3d 9b e8 52 10 c2 ff <0f> 0b 48 89 fe 4c 89 c2 48 c7 c7 78 1a 3d 9b e8 3e 10 c2 ff 0f 0b
RSP: 0018:ffffb296c1d47d90 EFLAGS: 00010246
RAX: 0000000000000054 RBX: ffff8ba032456ec8 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffff8ba039e99cc8 RDI: ffff8ba039e99cc8
RBP: ffff8ba032456e60 R08: 0000000000000781 R09: 0000000000000003
R10: 0000000000000000 R11: 0000000000000001 R12: ffff8ba009a4abe0
R13: ffff8ba032456e8c R14: 0000000000000000 R15: ffff8ba00adb01d8
FS: 0000000000000000(0000) GS:ffff8ba039e80000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb213f0b008 CR3: 00000001347de006 CR4: 00000000003606e0
Call Trace:
release_lock_stateid+0x2b/0x80 [nfsd]
nfsd4_free_stateid+0x1e9/0x210 [nfsd]
nfsd4_proc_compound+0x414/0x700 [nfsd]
? nfs4svc_decode_compoundargs+0x407/0x4c0 [nfsd]
nfsd_dispatch+0xc1/0x200 [nfsd]
svc_process_common+0x476/0x6f0 [sunrpc]
? svc_sock_secure_port+0x12/0x30 [sunrpc]
? svc_recv+0x313/0x9c0 [sunrpc]
? nfsd_svc+0x2d0/0x2d0 [nfsd]
svc_process+0xd4/0x110 [sunrpc]
nfsd+0xe3/0x140 [nfsd]
kthread+0xf9/0x130
? nfsd_destroy+0x50/0x50 [nfsd]
? kthread_park+0x90/0x90
ret_from_fork+0x1f/0x40
The fix is to ensure that lock creation tests for whether or not the
open stateid is unhashed, and to fail if that is the case.
mFixes: 659aefb68eca ("nfsd: Ensure we don't recognise lock stateids after freeing them")
Signed-off-by: Trond Myklebust <trond.myklebust at hammerspace.com>
Signed-off-by: Chuck Lever <chuck.lever at oracle.com>
(cherry picked from ms commit a451b12311aa ("nfsd: Don't add locks to closed or
closing open stateids"))
taken from vz7 commit 50f1e38cba0c ("ms/nfsd: Don't add locks to closed or closing
open stateids")
https://jira.sw.ru/browse/PSBM-121984
Signed-off-by: Vasily Averin <vvs at virtuozzo.com>
---
fs/nfsd/nfs4state.c | 73 +++++++++++++++++++++++++++++++----------------------
1 file changed, 43 insertions(+), 30 deletions(-)
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index fc664f059efe..c00880f508c5 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -484,6 +484,8 @@ find_any_file(struct nfs4_file *f)
{
struct file *ret;
+ if (!f)
+ return NULL;
spin_lock(&f->fi_lock);
ret = __nfs4_get_fd(f, O_RDWR);
if (!ret) {
@@ -1251,6 +1253,12 @@ static void nfs4_put_stateowner(struct nfs4_stateowner *sop)
nfs4_free_stateowner(sop);
}
+static bool
+nfs4_ol_stateid_unhashed(const struct nfs4_ol_stateid *stp)
+{
+ return list_empty(&stp->st_perfile);
+}
+
static bool unhash_ol_stateid(struct nfs4_ol_stateid *stp)
{
struct nfs4_file *fp = stp->st_stid.sc_file;
@@ -1318,9 +1326,11 @@ static bool unhash_lock_stateid(struct nfs4_ol_stateid *stp)
{
lockdep_assert_held(&stp->st_stid.sc_client->cl_lock);
+ if (!unhash_ol_stateid(stp))
+ return false;
list_del_init(&stp->st_locks);
nfs4_unhash_stid(&stp->st_stid);
- return unhash_ol_stateid(stp);
+ return true;
}
static void release_lock_stateid(struct nfs4_ol_stateid *stp)
@@ -1385,13 +1395,12 @@ static void release_open_stateid_locks(struct nfs4_ol_stateid *open_stp,
static bool unhash_open_stateid(struct nfs4_ol_stateid *stp,
struct list_head *reaplist)
{
- bool unhashed;
-
lockdep_assert_held(&stp->st_stid.sc_client->cl_lock);
- unhashed = unhash_ol_stateid(stp);
+ if (!unhash_ol_stateid(stp))
+ return false;
release_open_stateid_locks(stp, reaplist);
- return unhashed;
+ return true;
}
static void release_open_stateid(struct nfs4_ol_stateid *stp)
@@ -6258,21 +6267,21 @@ alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp,
}
static struct nfs4_ol_stateid *
-find_lock_stateid(struct nfs4_lockowner *lo, struct nfs4_file *fp)
+find_lock_stateid(const struct nfs4_lockowner *lo,
+ const struct nfs4_ol_stateid *ost)
{
struct nfs4_ol_stateid *lst;
- struct nfs4_client *clp = lo->lo_owner.so_client;
- lockdep_assert_held(&clp->cl_lock);
+ lockdep_assert_held(&ost->st_stid.sc_client->cl_lock);
- list_for_each_entry(lst, &lo->lo_owner.so_stateids, st_perstateowner) {
- if (lst->st_stid.sc_type != NFS4_LOCK_STID)
- continue;
- if (lst->st_stid.sc_file == fp) {
- refcount_inc(&lst->st_stid.sc_count);
- return lst;
+ /* If ost is not hashed, ost->st_locks will not be valid */
+ if (!nfs4_ol_stateid_unhashed(ost))
+ list_for_each_entry(lst, &ost->st_locks, st_locks) {
+ if (lst->st_stateowner == &lo->lo_owner) {
+ refcount_inc(&lst->st_stid.sc_count);
+ return lst;
+ }
}
- }
return NULL;
}
@@ -6288,11 +6297,11 @@ init_lock_stateid(struct nfs4_ol_stateid *stp, struct nfs4_lockowner *lo,
mutex_lock_nested(&stp->st_mutex, OPEN_STATEID_MUTEX);
retry:
spin_lock(&clp->cl_lock);
- spin_lock(&fp->fi_lock);
- retstp = find_lock_stateid(lo, fp);
+ if (nfs4_ol_stateid_unhashed(open_stp))
+ goto out_close;
+ retstp = find_lock_stateid(lo, open_stp);
if (retstp)
- goto out_unlock;
-
+ goto out_found;
refcount_inc(&stp->st_stid.sc_count);
stp->st_stid.sc_type = NFS4_LOCK_STID;
stp->st_stateowner = nfs4_get_stateowner(&lo->lo_owner);
@@ -6301,22 +6310,26 @@ init_lock_stateid(struct nfs4_ol_stateid *stp, struct nfs4_lockowner *lo,
stp->st_access_bmap = 0;
stp->st_deny_bmap = open_stp->st_deny_bmap;
stp->st_openstp = open_stp;
+ spin_lock(&fp->fi_lock);
list_add(&stp->st_locks, &open_stp->st_locks);
list_add(&stp->st_perstateowner, &lo->lo_owner.so_stateids);
list_add(&stp->st_perfile, &fp->fi_stateids);
-out_unlock:
spin_unlock(&fp->fi_lock);
spin_unlock(&clp->cl_lock);
- if (retstp) {
- if (nfsd4_lock_ol_stateid(retstp) != nfs_ok) {
- nfs4_put_stid(&retstp->st_stid);
- goto retry;
- }
- /* To keep mutex tracking happy */
- mutex_unlock(&stp->st_mutex);
- stp = retstp;
- }
return stp;
+out_found:
+ spin_unlock(&clp->cl_lock);
+ if (nfsd4_lock_ol_stateid(retstp) != nfs_ok) {
+ nfs4_put_stid(&retstp->st_stid);
+ goto retry;
+ }
+ /* To keep mutex tracking happy */
+ mutex_unlock(&stp->st_mutex);
+ return retstp;
+out_close:
+ spin_unlock(&clp->cl_lock);
+ mutex_unlock(&stp->st_mutex);
+ return NULL;
}
static struct nfs4_ol_stateid *
@@ -6331,7 +6344,7 @@ find_or_create_lock_stateid(struct nfs4_lockowner *lo, struct nfs4_file *fi,
*new = false;
spin_lock(&clp->cl_lock);
- lst = find_lock_stateid(lo, fi);
+ lst = find_lock_stateid(lo, ost);
spin_unlock(&clp->cl_lock);
if (lst != NULL) {
if (nfsd4_lock_ol_stateid(lst) == nfs_ok)
More information about the Devel
mailing list