These flags serve essentially the same purpose and get set and cleared
at the same time. Drop CB_GETATTR_BUSY and just use
NFSD4_CALLBACK_RUNNING instead.
For this to work, we must use clear_and_wake_up_bit(), but doing that on
for other types of callbacks is wasteful. Declare a new NFSD4_CALLBACK_WAKE
flag in cb_flags to indicate that wake_up is needed, and only set that
for CB_GETATTRs.
Also, make the wait use a TASK_UNINTERRUPTIBLE sleep. This is done in
the context of an nfsd thread, and it should never need to deal with
signals.
Signed-off-by: Jeff Layton <jlayton@xxxxxxxxxx>
---
fs/nfsd/nfs4callback.c | 6 +++++-
fs/nfsd/nfs4state.c | 17 +++++++++--------
fs/nfsd/state.h | 5 +----
3 files changed, 15 insertions(+), 13 deletions(-)
diff --git a/fs/nfsd/nfs4callback.c b/fs/nfsd/nfs4callback.c
index 1f26c811e5f73c2e745ee68d0b6e668d1dd7c704..bb2cb0d1b7885bf5f6be39221cb3dd95518326e5 100644
--- a/fs/nfsd/nfs4callback.c
+++ b/fs/nfsd/nfs4callback.c
@@ -1312,7 +1312,11 @@ static void nfsd41_destroy_cb(struct nfsd4_callback *cb)
trace_nfsd_cb_destroy(clp, cb);
nfsd41_cb_release_slot(cb);
- clear_bit(NFSD4_CALLBACK_RUNNING, &cb->cb_flags);
+ if (test_bit(NFSD4_CALLBACK_WAKE, &cb->cb_flags))
+ clear_and_wake_up_bit(NFSD4_CALLBACK_RUNNING, &cb->cb_flags);
+ else
+ clear_bit(NFSD4_CALLBACK_RUNNING, &cb->cb_flags);
+
if (cb->cb_ops && cb->cb_ops->release)
cb->cb_ops->release(cb);
nfsd41_cb_inflight_end(clp);
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 422439a46ffd03926524b8463cfdabfb866281b3..b68bc3f12a8c29904e6bdd2b5a1e4ed6418104e3 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -3205,7 +3205,6 @@ nfsd4_cb_getattr_release(struct nfsd4_callback *cb)
struct nfs4_delegation *dp =
container_of(ncf, struct nfs4_delegation, dl_cb_fattr);
- clear_and_wake_up_bit(CB_GETATTR_BUSY, &ncf->ncf_cb_flags);
nfs4_put_stid(&dp->dl_stid);
}
@@ -3226,15 +3225,17 @@ static void nfs4_cb_getattr(struct nfs4_cb_fattr *ncf)
struct nfs4_delegation *dp =
container_of(ncf, struct nfs4_delegation, dl_cb_fattr);
- if (test_and_set_bit(CB_GETATTR_BUSY, &ncf->ncf_cb_flags))
+ if (test_and_set_bit(NFSD4_CALLBACK_RUNNING, &ncf->ncf_getattr.cb_flags))
return;
+
/* set to proper status when nfsd4_cb_getattr_done runs */
ncf->ncf_cb_status = NFS4ERR_IO;
- if (!test_and_set_bit(NFSD4_CALLBACK_RUNNING, &ncf->ncf_getattr.cb_flags)) {
- refcount_inc(&dp->dl_stid.sc_count);
- nfsd4_run_cb(&ncf->ncf_getattr);
- }
+ /* ensure that wake_bit is done when RUNNING is cleared */
+ set_bit(NFSD4_CALLBACK_WAKE, &ncf->ncf_getattr.cb_flags);
+
+ refcount_inc(&dp->dl_stid.sc_count);
+ nfsd4_run_cb(&ncf->ncf_getattr);
}
static struct nfs4_client *create_client(struct xdr_netobj name,
@@ -9210,8 +9211,8 @@ nfsd4_deleg_getattr_conflict(struct svc_rqst *rqstp, struct dentry *dentry,
nfs4_cb_getattr(&dp->dl_cb_fattr);
spin_unlock(&ctx->flc_lock);
- wait_on_bit_timeout(&ncf->ncf_cb_flags, CB_GETATTR_BUSY,
- TASK_INTERRUPTIBLE, NFSD_CB_GETATTR_TIMEOUT);
+ wait_on_bit_timeout(&ncf->ncf_getattr.cb_flags, NFSD4_CALLBACK_RUNNING,
+ TASK_UNINTERRUPTIBLE, NFSD_CB_GETATTR_TIMEOUT);
if (ncf->ncf_cb_status) {
/* Recall delegation only if client didn't respond */
status = nfserrno(nfsd_open_break_lease(inode, NFSD_MAY_READ));
diff --git a/fs/nfsd/state.h b/fs/nfsd/state.h
index 6967925f4b438b24c2abd5fcd4f3bd6664a81862..b7d6be45ad022194e90cdf8d19c2879be08143ff 100644
--- a/fs/nfsd/state.h
+++ b/fs/nfsd/state.h
@@ -68,6 +68,7 @@ struct nfsd4_callback {
struct nfs4_client *cb_clp;
struct rpc_message cb_msg;
#define NFSD4_CALLBACK_RUNNING BIT(0) // Callback is running
+#define NFSD4_CALLBACK_WAKE BIT(1) // must wake_bit when clearing RUNNING
unsigned long cb_flags;
const struct nfsd4_callback_ops *cb_ops;
struct work_struct cb_work;
@@ -164,15 +165,11 @@ struct nfs4_cb_fattr {
struct timespec64 ncf_cb_mtime;
struct timespec64 ncf_cb_atime;
- unsigned long ncf_cb_flags;
bool ncf_file_modified;
u64 ncf_initial_cinfo;
u64 ncf_cur_fsize;
};
-/* bits for ncf_cb_flags */
-#define CB_GETATTR_BUSY 0
-
/*
* Represents a delegation stateid. The nfs4_client holds references to these
* and they are put when it is being destroyed or when the delegation is
--
2.48.1
