Amend the pnfs return on close helper functions to enable sending the
layoutreturn op in CLOSE/DELEGRETURN. This closes a potential race between
CLOSE/DELEGRETURN and parallel OPEN calls to the same file, and allows the
client and the server to agree on whether or not there is an outstanding
layout.
Signed-off-by: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>
---
fs/nfs/nfs4proc.c | 45 ++++++++----------
fs/nfs/pnfs.c | 139 ++++++++++++++++++++++++------------------------------
fs/nfs/pnfs.h | 30 ++++++------
3 files changed, 96 insertions(+), 118 deletions(-)
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 765af663257a..221d97de0e2c 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -3052,7 +3052,8 @@ static void nfs4_free_closedata(void *data)
struct super_block *sb = calldata->state->inode->i_sb;
if (calldata->lr.roc)
- pnfs_roc_release(calldata->state->inode);
+ pnfs_roc_release(&calldata->lr.arg, &calldata->lr.res,
+ calldata->res.lr_ret);
nfs4_put_open_state(calldata->state);
nfs_free_seqid(calldata->arg.seqid);
nfs4_put_state_owner(sp);
@@ -3103,9 +3104,6 @@ static void nfs4_close_done(struct rpc_task *task, void *data)
switch (task->tk_status) {
case 0:
res_stateid = &calldata->res.stateid;
- if (calldata->lr.roc)
- pnfs_roc_set_barrier(state->inode,
- calldata->lr.roc_barrier);
renew_lease(server, calldata->timestamp);
break;
case -NFS4ERR_ADMIN_REVOKED:
@@ -3181,7 +3179,7 @@ static void nfs4_close_prepare(struct rpc_task *task, void *data)
goto out_no_action;
}
- if (!calldata->arg.lr_args && nfs4_wait_on_layoutreturn(inode, task)) {
+ if (!calldata->lr.roc && nfs4_wait_on_layoutreturn(inode, task)) {
nfs_release_seqid(calldata->arg.seqid);
goto out_wait;
}
@@ -3195,8 +3193,6 @@ static void nfs4_close_prepare(struct rpc_task *task, void *data)
else
calldata->arg.bitmask = NULL;
}
- if (calldata->lr.roc)
- pnfs_roc_get_barrier(inode, &calldata->lr.roc_barrier);
calldata->arg.share_access =
nfs4_map_atomic_open_share(NFS_SERVER(inode),
@@ -3223,13 +3219,6 @@ static const struct rpc_call_ops nfs4_close_ops = {
.rpc_release = nfs4_free_closedata,
};
-static bool nfs4_roc(struct inode *inode)
-{
- if (!nfs_have_layout(inode))
- return false;
- return pnfs_roc(inode);
-}
-
/*
* It is possible for data to be read/written from a mem-mapped file
* after the sys_close call (which hits the vfs layer as a flush).
@@ -3281,7 +3270,12 @@ int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
calldata->res.seqid = calldata->arg.seqid;
calldata->res.server = server;
calldata->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT;
- calldata->lr.roc = nfs4_roc(state->inode);
+ calldata->lr.roc = pnfs_roc(state->inode,
+ &calldata->lr.arg, &calldata->lr.res, msg.rpc_cred);
+ if (calldata->lr.roc) {
+ calldata->arg.lr_args = &calldata->lr.arg;
+ calldata->res.lr_res = &calldata->lr.res;
+ }
nfs_sb_active(calldata->inode->i_sb);
msg.rpc_argp = &calldata->arg;
@@ -5676,8 +5670,6 @@ static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
}
}
data->rpc_status = task->tk_status;
- if (data->lr.roc && data->rpc_status == 0)
- pnfs_roc_set_barrier(data->inode, data->lr.roc_barrier);
}
static void nfs4_delegreturn_release(void *calldata)
@@ -5687,7 +5679,8 @@ static void nfs4_delegreturn_release(void *calldata)
if (inode) {
if (data->lr.roc)
- pnfs_roc_release(inode);
+ pnfs_roc_release(&data->lr.arg, &data->lr.res,
+ data->res.lr_ret);
nfs_iput_and_deactive(inode);
}
kfree(calldata);
@@ -5699,13 +5692,9 @@ static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
d_data = (struct nfs4_delegreturndata *)data;
- if (!d_data->args.lr_args &&
- nfs4_wait_on_layoutreturn(d_data->inode, task))
+ if (!d_data->lr.roc && nfs4_wait_on_layoutreturn(d_data->inode, task))
return;
- if (d_data->lr.roc)
- pnfs_roc_get_barrier(d_data->inode, &d_data->lr.roc_barrier);
-
nfs4_setup_sequence(d_data->res.server,
&d_data->args.seq_args,
&d_data->res.seq_res,
@@ -5756,8 +5745,14 @@ static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, co
data->timestamp = jiffies;
data->rpc_status = 0;
data->inode = nfs_igrab_and_active(inode);
- if (data->inode)
- data->lr.roc = nfs4_roc(inode);
+ if (data->inode) {
+ data->lr.roc = pnfs_roc(inode, &data->lr.arg, &data->lr.res,
+ cred);
+ if (data->lr.roc) {
+ data->args.lr_args = &data->lr.arg;
+ data->res.lr_res = &data->lr.res;
+ }
+ }
task_setup_data.callback_data = data;
msg.rpc_argp = &data->args;
diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c
index a93afdd37203..f61cb81eb5ab 100644
--- a/fs/nfs/pnfs.c
+++ b/fs/nfs/pnfs.c
@@ -984,6 +984,20 @@ void pnfs_layoutreturn_free_lsegs(struct pnfs_layout_hdr *lo,
}
+static void
+pnfs_set_plh_return_info(struct pnfs_layout_hdr *lo, enum pnfs_iomode iomode,
+ u32 seq)
+{
+ if (lo->plh_return_iomode != 0 && lo->plh_return_iomode != iomode)
+ iomode = IOMODE_ANY;
+ lo->plh_return_iomode = iomode;
+ set_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags);
+ if (seq != 0) {
+ WARN_ON_ONCE(lo->plh_return_seq != 0 && lo->plh_return_seq != seq);
+ lo->plh_return_seq = seq;
+ }
+}
+
static bool
pnfs_prepare_layoutreturn(struct pnfs_layout_hdr *lo,
nfs4_stateid *stateid,
@@ -1188,17 +1202,22 @@ pnfs_commit_and_return_layout(struct inode *inode)
return ret;
}
-bool pnfs_roc(struct inode *ino)
+bool pnfs_roc(struct inode *ino,
+ struct nfs4_layoutreturn_args *args,
+ struct nfs4_layoutreturn_res *res,
+ const struct rpc_cred *cred)
{
struct nfs_inode *nfsi = NFS_I(ino);
struct nfs_open_context *ctx;
struct nfs4_state *state;
struct pnfs_layout_hdr *lo;
- struct pnfs_layout_segment *lseg, *tmp;
+ struct pnfs_layout_segment *lseg, *next;
nfs4_stateid stateid;
- LIST_HEAD(tmp_list);
- bool found = false, layoutreturn = false, roc = false;
+ enum pnfs_iomode iomode = 0;
+ bool layoutreturn = false, roc = false;
+ if (!nfs_have_layout(ino))
+ return false;
spin_lock(&ino->i_lock);
lo = nfsi->layout;
if (!lo || !pnfs_layout_is_valid(lo) ||
@@ -1217,83 +1236,63 @@ bool pnfs_roc(struct inode *ino)
}
- list_for_each_entry_safe(lseg, tmp, &lo->plh_segs, pls_list) {
+ list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list) {
/* If we are sending layoutreturn, invalidate all valid lsegs */
- if (test_bit(NFS_LSEG_ROC, &lseg->pls_flags)) {
- mark_lseg_invalid(lseg, &tmp_list);
- found = true;
- }
+ if (!test_and_clear_bit(NFS_LSEG_ROC, &lseg->pls_flags))
+ continue;
+ /*
+ * Note: mark lseg for return so pnfs_layout_remove_lseg
+ * doesn't invalidate the layout for us.
+ */
+ set_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags);
+ if (!mark_lseg_invalid(lseg, &lo->plh_return_segs))
+ continue;
+ pnfs_set_plh_return_info(lo, lseg->pls_range.iomode, 0);
}
- /* always send layoutreturn if being marked so */
- if (test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags)) {
- layoutreturn = pnfs_prepare_layoutreturn(lo,
- &stateid, NULL);
- if (layoutreturn)
- goto out_noroc;
- }
+ if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags))
+ goto out_noroc;
/* ROC in two conditions:
* 1. there are ROC lsegs
* 2. we don't send layoutreturn
*/
- if (found) {
- /* lo ref dropped in pnfs_roc_release() */
- pnfs_get_layout_hdr(lo);
- roc = true;
- }
+ /* lo ref dropped in pnfs_roc_release() */
+ layoutreturn = pnfs_prepare_layoutreturn(lo, &stateid, &iomode);
+ /* If the creds don't match, we can't compound the layoutreturn */
+ if (!layoutreturn || cred != lo->plh_lc_cred)
+ goto out_noroc;
+
+ roc = layoutreturn;
+ pnfs_init_layoutreturn_args(args, lo, &stateid, iomode);
+ res->lrs_present = 0;
+ layoutreturn = false;
out_noroc:
spin_unlock(&ino->i_lock);
- pnfs_free_lseg_list(&tmp_list);
pnfs_layoutcommit_inode(ino, true);
if (layoutreturn)
- pnfs_send_layoutreturn(lo, &stateid, IOMODE_ANY, true);
+ pnfs_send_layoutreturn(lo, &stateid, iomode, true);
return roc;
}
-void pnfs_roc_release(struct inode *ino)
+void pnfs_roc_release(struct nfs4_layoutreturn_args *args,
+ struct nfs4_layoutreturn_res *res,
+ int ret)
{
- struct pnfs_layout_hdr *lo;
+ struct pnfs_layout_hdr *lo = args->layout;
+ const nfs4_stateid *arg_stateid = NULL;
+ const nfs4_stateid *res_stateid = NULL;
- spin_lock(&ino->i_lock);
- lo = NFS_I(ino)->layout;
- pnfs_clear_layoutreturn_waitbit(lo);
- if (atomic_dec_and_test(&lo->plh_refcount)) {
- pnfs_detach_layout_hdr(lo);
- spin_unlock(&ino->i_lock);
- pnfs_free_layout_hdr(lo);
- } else
- spin_unlock(&ino->i_lock);
-}
-
-void pnfs_roc_set_barrier(struct inode *ino, u32 barrier)
-{
- struct pnfs_layout_hdr *lo;
-
- spin_lock(&ino->i_lock);
- lo = NFS_I(ino)->layout;
- if (pnfs_seqid_is_newer(barrier, lo->plh_barrier))
- lo->plh_barrier = barrier;
- spin_unlock(&ino->i_lock);
- trace_nfs4_layoutreturn_on_close(ino, 0);
-}
-
-void pnfs_roc_get_barrier(struct inode *ino, u32 *barrier)
-{
- struct nfs_inode *nfsi = NFS_I(ino);
- struct pnfs_layout_hdr *lo;
- u32 current_seqid;
-
- spin_lock(&ino->i_lock);
- lo = nfsi->layout;
- current_seqid = be32_to_cpu(lo->plh_stateid.seqid);
-
- /* Since close does not return a layout stateid for use as
- * a barrier, we choose the worst-case barrier.
- */
- *barrier = current_seqid + atomic_read(&lo->plh_outstanding);
- spin_unlock(&ino->i_lock);
+ if (ret == 0) {
+ arg_stateid = &args->stateid;
+ if (res->lrs_present)
+ res_stateid = &res->stateid;
+ }
+ pnfs_layoutreturn_free_lsegs(lo, arg_stateid, &args->range,
+ res_stateid);
+ pnfs_put_layout_hdr(lo);
+ trace_nfs4_layoutreturn_on_close(args->inode, 0);
}
bool pnfs_wait_on_layoutreturn(struct inode *ino, struct rpc_task *task)
@@ -1931,20 +1930,6 @@ pnfs_layout_process(struct nfs4_layoutget *lgp)
return ERR_PTR(-EAGAIN);
}
-static void
-pnfs_set_plh_return_info(struct pnfs_layout_hdr *lo, enum pnfs_iomode iomode,
- u32 seq)
-{
- if (lo->plh_return_iomode != 0 && lo->plh_return_iomode != iomode)
- iomode = IOMODE_ANY;
- lo->plh_return_iomode = iomode;
- set_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags);
- if (seq != 0) {
- WARN_ON_ONCE(lo->plh_return_seq != 0 && lo->plh_return_seq != seq);
- lo->plh_return_seq = seq;
- }
-}
-
/**
* pnfs_mark_matching_lsegs_return - Free or return matching layout segments
* @lo: pointer to layout header
diff --git a/fs/nfs/pnfs.h b/fs/nfs/pnfs.h
index 75ff9392127f..f55c065664e1 100644
--- a/fs/nfs/pnfs.h
+++ b/fs/nfs/pnfs.h
@@ -271,10 +271,13 @@ int pnfs_mark_matching_lsegs_return(struct pnfs_layout_hdr *lo,
u32 seq);
int pnfs_mark_layout_stateid_invalid(struct pnfs_layout_hdr *lo,
struct list_head *lseg_list);
-bool pnfs_roc(struct inode *ino);
-void pnfs_roc_release(struct inode *ino);
-void pnfs_roc_set_barrier(struct inode *ino, u32 barrier);
-void pnfs_roc_get_barrier(struct inode *ino, u32 *barrier);
+bool pnfs_roc(struct inode *ino,
+ struct nfs4_layoutreturn_args *args,
+ struct nfs4_layoutreturn_res *res,
+ const struct rpc_cred *cred);
+void pnfs_roc_release(struct nfs4_layoutreturn_args *args,
+ struct nfs4_layoutreturn_res *res,
+ int ret);
bool pnfs_wait_on_layoutreturn(struct inode *ino, struct rpc_task *task);
void pnfs_set_layoutcommit(struct inode *, struct pnfs_layout_segment *, loff_t);
void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data);
@@ -666,23 +669,18 @@ pnfs_layoutcommit_outstanding(struct inode *inode)
static inline bool
-pnfs_roc(struct inode *ino)
+pnfs_roc(struct inode *ino,
+ struct nfs4_layoutreturn_args *args,
+ struct nfs4_layoutreturn_res *res,
+ const struct rpc_cred *cred)
{
return false;
}
static inline void
-pnfs_roc_release(struct inode *ino)
-{
-}
-
-static inline void
-pnfs_roc_set_barrier(struct inode *ino, u32 barrier)
-{
-}
-
-static inline void
-pnfs_roc_get_barrier(struct inode *ino, u32 *barrier)
+pnfs_roc_release(struct nfs4_layoutreturn_args *args,
+ struct nfs4_layoutreturn_res *res,
+ int ret)
{
}
--
2.9.3
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