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NFS client bugfixes for Linux 4.20 

Highlights include:
 
 Bugfixes:
  - Fix a NFSv4 state manager deadlock when returning a delegation
  - NFSv4.2 copy do not allocate memory under the lock
  - flexfiles: Use the correct stateid for IO in the tightly coupled case
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Merge tag 'nfs-for-4.20-4' of git://git.linux-nfs.org/projects/trondmy/linux-nfs

Pull NFS client bugfixes from Trond Myklebust:

 - Fix a NFSv4 state manager deadlock when returning a delegation

 - NFSv4.2 copy do not allocate memory under the lock

 - flexfiles: Use the correct stateid for IO in the tightly coupled case

* tag 'nfs-for-4.20-4' of git://git.linux-nfs.org/projects/trondmy/linux-nfs:
  flexfiles: use per-mirror specified stateid for IO
  NFSv4.2 copy do not allocate memory under the lock
  NFSv4: Fix a NFSv4 state manager deadlock
This commit is contained in:
Linus Torvalds 2018-11-25 09:19:58 -08:00
parent 4e962ff6e3 bb21ce0ad2
commit 17c2f54086
7 changed files with 66 additions and 37 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
fs/nfs/callback_proc.c
View File

@ -686,20 +686,24 @@ __be32 nfs4_callback_offload(void *data, void *dummy,
{
struct cb_offloadargs *args = data;
struct nfs_server *server;
struct nfs4_copy_state *copy;
struct nfs4_copy_state *copy, *tmp_copy;
bool found = false;
copy = kzalloc(sizeof(struct nfs4_copy_state), GFP_NOFS);
if (!copy)
return htonl(NFS4ERR_SERVERFAULT);
spin_lock(&cps->clp->cl_lock);
rcu_read_lock();
list_for_each_entry_rcu(server, &cps->clp->cl_superblocks,
client_link) {
list_for_each_entry(copy, &server->ss_copies, copies) {
list_for_each_entry(tmp_copy, &server->ss_copies, copies) {
if (memcmp(args->coa_stateid.other,
copy->stateid.other,
tmp_copy->stateid.other,
sizeof(args->coa_stateid.other)))
continue;
nfs4_copy_cb_args(copy, args);
complete(&copy->completion);
nfs4_copy_cb_args(tmp_copy, args);
complete(&tmp_copy->completion);
found = true;
goto out;
}
@ -707,15 +711,11 @@ __be32 nfs4_callback_offload(void *data, void *dummy,
out:
rcu_read_unlock();
if (!found) {
copy = kzalloc(sizeof(struct nfs4_copy_state), GFP_NOFS);
if (!copy) {
spin_unlock(&cps->clp->cl_lock);
return htonl(NFS4ERR_SERVERFAULT);
}
memcpy(&copy->stateid, &args->coa_stateid, NFS4_STATEID_SIZE);
nfs4_copy_cb_args(copy, args);
list_add_tail(&copy->copies, &cps->clp->pending_cb_stateids);
}
} else
kfree(copy);
spin_unlock(&cps->clp->cl_lock);
return 0;

21
fs/nfs/flexfilelayout/flexfilelayout.c
View File

@ -1361,12 +1361,7 @@ static void ff_layout_read_prepare_v4(struct rpc_task *task, void *data)
task))
return;
if (ff_layout_read_prepare_common(task, hdr))
return;
if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
hdr->args.lock_context, FMODE_READ) == -EIO)
rpc_exit(task, -EIO); /* lost lock, terminate I/O */
ff_layout_read_prepare_common(task, hdr);
}
static void ff_layout_read_call_done(struct rpc_task *task, void *data)
@ -1542,12 +1537,7 @@ static void ff_layout_write_prepare_v4(struct rpc_task *task, void *data)
task))
return;
if (ff_layout_write_prepare_common(task, hdr))
return;
if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
hdr->args.lock_context, FMODE_WRITE) == -EIO)
rpc_exit(task, -EIO); /* lost lock, terminate I/O */
ff_layout_write_prepare_common(task, hdr);
}
static void ff_layout_write_call_done(struct rpc_task *task, void *data)
@ -1742,6 +1732,10 @@ ff_layout_read_pagelist(struct nfs_pgio_header *hdr)
fh = nfs4_ff_layout_select_ds_fh(lseg, idx);
if (fh)
hdr->args.fh = fh;
if (!nfs4_ff_layout_select_ds_stateid(lseg, idx, &hdr->args.stateid))
goto out_failed;
/*
* Note that if we ever decide to split across DSes,
* then we may need to handle dense-like offsets.
@ -1804,6 +1798,9 @@ ff_layout_write_pagelist(struct nfs_pgio_header *hdr, int sync)
if (fh)
hdr->args.fh = fh;
if (!nfs4_ff_layout_select_ds_stateid(lseg, idx, &hdr->args.stateid))
goto out_failed;
/*
* Note that if we ever decide to split across DSes,
* then we may need to handle dense-like offsets.

4
fs/nfs/flexfilelayout/flexfilelayout.h
View File

@ -215,6 +215,10 @@ unsigned int ff_layout_fetch_ds_ioerr(struct pnfs_layout_hdr *lo,
unsigned int maxnum);
struct nfs_fh *
nfs4_ff_layout_select_ds_fh(struct pnfs_layout_segment *lseg, u32 mirror_idx);
int
nfs4_ff_layout_select_ds_stateid(struct pnfs_layout_segment *lseg,
u32 mirror_idx,
nfs4_stateid *stateid);
struct nfs4_pnfs_ds *
nfs4_ff_layout_prepare_ds(struct pnfs_layout_segment *lseg, u32 ds_idx,

19
fs/nfs/flexfilelayout/flexfilelayoutdev.c
View File

@ -370,6 +370,25 @@ out:
return fh;
}
int
nfs4_ff_layout_select_ds_stateid(struct pnfs_layout_segment *lseg,
u32 mirror_idx,
nfs4_stateid *stateid)
{
struct nfs4_ff_layout_mirror *mirror = FF_LAYOUT_COMP(lseg, mirror_idx);
if (!ff_layout_mirror_valid(lseg, mirror, false)) {
pr_err_ratelimited("NFS: %s: No data server for mirror offset index %d\n",
__func__, mirror_idx);
goto out;
}
nfs4_stateid_copy(stateid, &mirror->stateid);
return 1;
out:
return 0;
}
/**
* nfs4_ff_layout_prepare_ds - prepare a DS connection for an RPC call
* @lseg: the layout segment we're operating on

19
fs/nfs/nfs42proc.c
View File

@ -137,31 +137,32 @@ static int handle_async_copy(struct nfs42_copy_res *res,
struct file *dst,
nfs4_stateid *src_stateid)
{
struct nfs4_copy_state *copy;
struct nfs4_copy_state *copy, *tmp_copy;
int status = NFS4_OK;
bool found_pending = false;
struct nfs_open_context *ctx = nfs_file_open_context(dst);
copy = kzalloc(sizeof(struct nfs4_copy_state), GFP_NOFS);
if (!copy)
return -ENOMEM;
spin_lock(&server->nfs_client->cl_lock);
list_for_each_entry(copy, &server->nfs_client->pending_cb_stateids,
list_for_each_entry(tmp_copy, &server->nfs_client->pending_cb_stateids,
copies) {
if (memcmp(&res->write_res.stateid, &copy->stateid,
if (memcmp(&res->write_res.stateid, &tmp_copy->stateid,
NFS4_STATEID_SIZE))
continue;
found_pending = true;
list_del(&copy->copies);
list_del(&tmp_copy->copies);
break;
}
if (found_pending) {
spin_unlock(&server->nfs_client->cl_lock);
kfree(copy);
copy = tmp_copy;
goto out;
}
copy = kzalloc(sizeof(struct nfs4_copy_state), GFP_NOFS);
if (!copy) {
spin_unlock(&server->nfs_client->cl_lock);
return -ENOMEM;
}
memcpy(&copy->stateid, &res->write_res.stateid, NFS4_STATEID_SIZE);
init_completion(&copy->completion);
copy->parent_state = ctx->state;

2
fs/nfs/nfs4_fs.h
View File

@ -41,6 +41,8 @@ enum nfs4_client_state {
NFS4CLNT_MOVED,
NFS4CLNT_LEASE_MOVED,
NFS4CLNT_DELEGATION_EXPIRED,
NFS4CLNT_RUN_MANAGER,
NFS4CLNT_DELEGRETURN_RUNNING,
};
#define NFS4_RENEW_TIMEOUT 0x01

16
fs/nfs/nfs4state.c
View File

@ -1210,6 +1210,7 @@ void nfs4_schedule_state_manager(struct nfs_client *clp)
struct task_struct *task;
char buf[INET6_ADDRSTRLEN + sizeof("-manager") + 1];
set_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state);
if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
return;
__module_get(THIS_MODULE);
@ -2503,6 +2504,7 @@ static void nfs4_state_manager(struct nfs_client *clp)
/* Ensure exclusive access to NFSv4 state */
do {
clear_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state);
if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
section = "purge state";
status = nfs4_purge_lease(clp);
@ -2593,14 +2595,18 @@ static void nfs4_state_manager(struct nfs_client *clp)
}
nfs4_end_drain_session(clp);
if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) {
nfs_client_return_marked_delegations(clp);
continue;
nfs4_clear_state_manager_bit(clp);
if (!test_and_set_bit(NFS4CLNT_DELEGRETURN_RUNNING, &clp->cl_state)) {
if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) {
nfs_client_return_marked_delegations(clp);
set_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state);
}
clear_bit(NFS4CLNT_DELEGRETURN_RUNNING, &clp->cl_state);
}
nfs4_clear_state_manager_bit(clp);
/* Did we race with an attempt to give us more work? */
if (clp->cl_state == 0)
if (!test_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state))
return;
if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
return;