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authorAlexander Aring <aahringo@redhat.com>2023-11-13 22:24:09 +0100
committerDavid Teigland <teigland@redhat.com>2023-11-16 18:59:19 +0100
commitdbee1adeb7e6d31c9afbad8e9248c15694f1cc0c (patch)
treea446e779b4552b11b4298b848804d1971a2f6bb9 /fs/dlm
parentdlm: use kernel_connect() and kernel_bind() (diff)
downloadlinux-dbee1adeb7e6d31c9afbad8e9248c15694f1cc0c.tar.xz
linux-dbee1adeb7e6d31c9afbad8e9248c15694f1cc0c.zip
dlm: use fl_owner from lockd
This patch is changing the fl_owner value in case of an nfs lock request to not be the pid of lockd. Instead this patch changes it to be the owner value that nfs is giving us. Currently there exists proved problems with this behaviour. One nfsd server was created to export a gfs2 filesystem mount. Two nfs clients doing a nfs mount of this export. Those two clients should conflict each other operating on the same nfs file. A small test program was written: int main(int argc, const char *argv[]) { struct flock fl = { .l_type = F_WRLCK, .l_whence = SEEK_SET, .l_start = 1L, .l_len = 1L, }; int fd; fd = open("filename", O_RDWR | O_CREAT, 0700); printf("try to lock...\n"); fcntl(fd, F_SETLKW, &fl); printf("locked!\n"); getc(stdin); return 0; } Running on both clients at the same time and don't interrupting by pressing any key. It will show that both clients are able to acquire the lock which shouldn't be the case. The issue is here that the fl_owner value is the same and the lock context of both clients should be separated. This patch lets lockd define how to deal with lock contexts and chose hopefully the right fl_owner value. A test after this patch was made and the locks conflicts each other which should be the case. Acked-by: Jeff Layton <jlayton@kernel.org> Signed-off-by: Alexander Aring <aahringo@redhat.com> Signed-off-by: David Teigland <teigland@redhat.com>
Diffstat (limited to 'fs/dlm')
-rw-r--r--fs/dlm/plock.c18
1 files changed, 4 insertions, 14 deletions
diff --git a/fs/dlm/plock.c b/fs/dlm/plock.c
index e6b4c1a21446..ee6e0236d4f8 100644
--- a/fs/dlm/plock.c
+++ b/fs/dlm/plock.c
@@ -145,6 +145,7 @@ int dlm_posix_lock(dlm_lockspace_t *lockspace, u64 number, struct file *file,
op->info.number = number;
op->info.start = fl->fl_start;
op->info.end = fl->fl_end;
+ op->info.owner = (__u64)(long)fl->fl_owner;
/* async handling */
if (fl->fl_lmops && fl->fl_lmops->lm_grant) {
op_data = kzalloc(sizeof(*op_data), GFP_NOFS);
@@ -154,9 +155,6 @@ int dlm_posix_lock(dlm_lockspace_t *lockspace, u64 number, struct file *file,
goto out;
}
- /* fl_owner is lockd which doesn't distinguish
- processes on the nfs client */
- op->info.owner = (__u64) fl->fl_pid;
op_data->callback = fl->fl_lmops->lm_grant;
locks_init_lock(&op_data->flc);
locks_copy_lock(&op_data->flc, fl);
@@ -168,8 +166,6 @@ int dlm_posix_lock(dlm_lockspace_t *lockspace, u64 number, struct file *file,
send_op(op);
rv = FILE_LOCK_DEFERRED;
goto out;
- } else {
- op->info.owner = (__u64)(long) fl->fl_owner;
}
send_op(op);
@@ -326,10 +322,7 @@ int dlm_posix_unlock(dlm_lockspace_t *lockspace, u64 number, struct file *file,
op->info.number = number;
op->info.start = fl->fl_start;
op->info.end = fl->fl_end;
- if (fl->fl_lmops && fl->fl_lmops->lm_grant)
- op->info.owner = (__u64) fl->fl_pid;
- else
- op->info.owner = (__u64)(long) fl->fl_owner;
+ op->info.owner = (__u64)(long)fl->fl_owner;
if (fl->fl_flags & FL_CLOSE) {
op->info.flags |= DLM_PLOCK_FL_CLOSE;
@@ -389,7 +382,7 @@ int dlm_posix_cancel(dlm_lockspace_t *lockspace, u64 number, struct file *file,
info.number = number;
info.start = fl->fl_start;
info.end = fl->fl_end;
- info.owner = (__u64)fl->fl_pid;
+ info.owner = (__u64)(long)fl->fl_owner;
rv = do_lock_cancel(&info);
switch (rv) {
@@ -450,10 +443,7 @@ int dlm_posix_get(dlm_lockspace_t *lockspace, u64 number, struct file *file,
op->info.number = number;
op->info.start = fl->fl_start;
op->info.end = fl->fl_end;
- if (fl->fl_lmops && fl->fl_lmops->lm_grant)
- op->info.owner = (__u64) fl->fl_pid;
- else
- op->info.owner = (__u64)(long) fl->fl_owner;
+ op->info.owner = (__u64)(long)fl->fl_owner;
send_op(op);
wait_event(recv_wq, (op->done != 0));