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NFSD: enhance inter-server copy cleanup 

[ Upstream commit df24ac7a2e ]

Currently nfsd4_setup_inter_ssc returns the vfsmount of the source
server's export when the mount completes. After the copy is done
nfsd4_cleanup_inter_ssc is called with the vfsmount of the source
server and it searches nfsd_ssc_mount_list for a matching entry
to do the clean up.

The problems with this approach are (1) the need to search the
nfsd_ssc_mount_list and (2) the code has to handle the case where
the matching entry is not found which looks ugly.

The enhancement is instead of nfsd4_setup_inter_ssc returning the
vfsmount, it returns the nfsd4_ssc_umount_item which has the
vfsmount embedded in it. When nfsd4_cleanup_inter_ssc is called
it's passed with the nfsd4_ssc_umount_item directly to do the
clean up so no searching is needed and there is no need to handle
the 'not found' case.

Signed-off-by: Dai Ngo <dai.ngo@oracle.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
[ cel: adjusted whitespace and variable/function names ]
Reviewed-by: Olga Kornievskaia <kolga@netapp.com>
Stable-dep-of: 34e8f9ec4c ("NFSD: fix leaked reference count of nfsd4_ssc_umount_item")
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Dai Ngo 2022-12-18 16:55:53 -08:00 committed by Greg Kroah-Hartman
parent 659d4c4ca5
commit c8b346b79a
3 changed files with 46 additions and 69 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

111
fs/nfsd/nfs4proc.c
View File

@ -1306,15 +1306,15 @@ extern void nfs_sb_deactive(struct super_block *sb);
* setup a work entry in the ssc delayed unmount list.
*/
static __be32 nfsd4_ssc_setup_dul(struct nfsd_net *nn, char *ipaddr,
struct nfsd4_ssc_umount_item **retwork, struct vfsmount **ss_mnt)
struct nfsd4_ssc_umount_item **nsui)
{
struct nfsd4_ssc_umount_item *ni = NULL;
struct nfsd4_ssc_umount_item *work = NULL;
struct nfsd4_ssc_umount_item *tmp;
DEFINE_WAIT(wait);
__be32 status = 0;
*ss_mnt = NULL;
*retwork = NULL;
*nsui = NULL;
work = kzalloc(sizeof(*work), GFP_KERNEL);
try_again:
spin_lock(&nn->nfsd_ssc_lock);
@ -1338,12 +1338,12 @@ try_again:
finish_wait(&nn->nfsd_ssc_waitq, &wait);
goto try_again;
}
*ss_mnt = ni->nsui_vfsmount;
*nsui = ni;
refcount_inc(&ni->nsui_refcnt);
spin_unlock(&nn->nfsd_ssc_lock);
kfree(work);
/* return vfsmount in ss_mnt */
/* return vfsmount in (*nsui)->nsui_vfsmount */
return 0;
}
if (work) {
@ -1351,31 +1351,32 @@ try_again:
refcount_set(&work->nsui_refcnt, 2);
work->nsui_busy = true;
list_add_tail(&work->nsui_list, &nn->nfsd_ssc_mount_list);
*retwork = work;
}
*nsui = work;
} else
status = nfserr_resource;
spin_unlock(&nn->nfsd_ssc_lock);
return 0;
return status;
}
static void nfsd4_ssc_update_dul_work(struct nfsd_net *nn,
struct nfsd4_ssc_umount_item *work, struct vfsmount *ss_mnt)
static void nfsd4_ssc_update_dul(struct nfsd_net *nn,
struct nfsd4_ssc_umount_item *nsui,
struct vfsmount *ss_mnt)
{
/* set nsui_vfsmount, clear busy flag and wakeup waiters */
spin_lock(&nn->nfsd_ssc_lock);
work->nsui_vfsmount = ss_mnt;
work->nsui_busy = false;
nsui->nsui_vfsmount = ss_mnt;
nsui->nsui_busy = false;
wake_up_all(&nn->nfsd_ssc_waitq);
spin_unlock(&nn->nfsd_ssc_lock);
}
static void nfsd4_ssc_cancel_dul_work(struct nfsd_net *nn,
struct nfsd4_ssc_umount_item *work)
static void nfsd4_ssc_cancel_dul(struct nfsd_net *nn,
struct nfsd4_ssc_umount_item *nsui)
{
spin_lock(&nn->nfsd_ssc_lock);
list_del(&work->nsui_list);
list_del(&nsui->nsui_list);
wake_up_all(&nn->nfsd_ssc_waitq);
spin_unlock(&nn->nfsd_ssc_lock);
kfree(work);
kfree(nsui);
}
/*
@ -1383,7 +1384,7 @@ static void nfsd4_ssc_cancel_dul_work(struct nfsd_net *nn,
*/
static __be32
nfsd4_interssc_connect(struct nl4_server *nss, struct svc_rqst *rqstp,
struct vfsmount **mount)
struct nfsd4_ssc_umount_item **nsui)
{
struct file_system_type *type;
struct vfsmount *ss_mnt;
@ -1394,7 +1395,6 @@ nfsd4_interssc_connect(struct nl4_server *nss, struct svc_rqst *rqstp,
char *ipaddr, *dev_name, *raw_data;
int len, raw_len;
__be32 status = nfserr_inval;
struct nfsd4_ssc_umount_item *work = NULL;
struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
naddr = &nss->u.nl4_addr;
@ -1402,6 +1402,7 @@ nfsd4_interssc_connect(struct nl4_server *nss, struct svc_rqst *rqstp,
naddr->addr_len,
(struct sockaddr *)&tmp_addr,
sizeof(tmp_addr));
*nsui = NULL;
if (tmp_addrlen == 0)
goto out_err;
@ -1444,10 +1445,10 @@ nfsd4_interssc_connect(struct nl4_server *nss, struct svc_rqst *rqstp,
goto out_free_rawdata;
snprintf(dev_name, len + 5, "%s%s%s:/", startsep, ipaddr, endsep);
status = nfsd4_ssc_setup_dul(nn, ipaddr, &work, &ss_mnt);
status = nfsd4_ssc_setup_dul(nn, ipaddr, nsui);
if (status)
goto out_free_devname;
if (ss_mnt)
if ((*nsui)->nsui_vfsmount)
goto out_done;
/* Use an 'internal' mount: SB_KERNMOUNT -> MNT_INTERNAL */
@ -1455,15 +1456,12 @@ nfsd4_interssc_connect(struct nl4_server *nss, struct svc_rqst *rqstp,
module_put(type->owner);
if (IS_ERR(ss_mnt)) {
status = nfserr_nodev;
if (work)
nfsd4_ssc_cancel_dul_work(nn, work);
nfsd4_ssc_cancel_dul(nn, *nsui);
goto out_free_devname;
}
if (work)
nfsd4_ssc_update_dul_work(nn, work, ss_mnt);
nfsd4_ssc_update_dul(nn, *nsui, ss_mnt);
out_done:
status = 0;
*mount = ss_mnt;
out_free_devname:
kfree(dev_name);
@ -1487,7 +1485,7 @@ out_err:
static __be32
nfsd4_setup_inter_ssc(struct svc_rqst *rqstp,
struct nfsd4_compound_state *cstate,
struct nfsd4_copy *copy, struct vfsmount **mount)
struct nfsd4_copy *copy)
{
struct svc_fh *s_fh = NULL;
stateid_t *s_stid = &copy->cp_src_stateid;
@ -1500,7 +1498,7 @@ nfsd4_setup_inter_ssc(struct svc_rqst *rqstp,
if (status)
goto out;
status = nfsd4_interssc_connect(copy->cp_src, rqstp, mount);
status = nfsd4_interssc_connect(copy->cp_src, rqstp, &copy->ss_nsui);
if (status)
goto out;
@ -1518,45 +1516,27 @@ out:
}
static void
nfsd4_cleanup_inter_ssc(struct vfsmount *ss_mnt, struct file *filp,
nfsd4_cleanup_inter_ssc(struct nfsd4_ssc_umount_item *nsui, struct file *filp,
struct nfsd_file *dst)
{
bool found = false;
long timeout;
struct nfsd4_ssc_umount_item *tmp;
struct nfsd4_ssc_umount_item *ni = NULL;
struct nfsd_net *nn = net_generic(dst->nf_net, nfsd_net_id);
long timeout = msecs_to_jiffies(nfsd4_ssc_umount_timeout);
nfs42_ssc_close(filp);
nfsd_file_put(dst);
fput(filp);
if (!nn) {
mntput(ss_mnt);
return;
}
spin_lock(&nn->nfsd_ssc_lock);
timeout = msecs_to_jiffies(nfsd4_ssc_umount_timeout);
list_for_each_entry_safe(ni, tmp, &nn->nfsd_ssc_mount_list, nsui_list) {
if (ni->nsui_vfsmount->mnt_sb == ss_mnt->mnt_sb) {
list_del(&ni->nsui_list);
/*
* vfsmount can be shared by multiple exports,
* decrement refcnt. If the count drops to 1 it
* will be unmounted when nsui_expire expires.
*/
refcount_dec(&ni->nsui_refcnt);
ni->nsui_expire = jiffies + timeout;
list_add_tail(&ni->nsui_list, &nn->nfsd_ssc_mount_list);
found = true;
break;
}
}
list_del(&nsui->nsui_list);
/*
* vfsmount can be shared by multiple exports,
* decrement refcnt. If the count drops to 1 it
* will be unmounted when nsui_expire expires.
*/
refcount_dec(&nsui->nsui_refcnt);
nsui->nsui_expire = jiffies + timeout;
list_add_tail(&nsui->nsui_list, &nn->nfsd_ssc_mount_list);
spin_unlock(&nn->nfsd_ssc_lock);
if (!found) {
mntput(ss_mnt);
return;
}
}
#else /* CONFIG_NFSD_V4_2_INTER_SSC */
@ -1564,15 +1544,13 @@ nfsd4_cleanup_inter_ssc(struct vfsmount *ss_mnt, struct file *filp,
static __be32
nfsd4_setup_inter_ssc(struct svc_rqst *rqstp,
struct nfsd4_compound_state *cstate,
struct nfsd4_copy *copy,
struct vfsmount **mount)
struct nfsd4_copy *copy)
{
*mount = NULL;
return nfserr_inval;
}
static void
nfsd4_cleanup_inter_ssc(struct vfsmount *ss_mnt, struct file *filp,
nfsd4_cleanup_inter_ssc(struct nfsd4_ssc_umount_item *nsui, struct file *filp,
struct nfsd_file *dst)
{
}
@ -1713,7 +1691,7 @@ static void dup_copy_fields(struct nfsd4_copy *src, struct nfsd4_copy *dst)
memcpy(dst->cp_src, src->cp_src, sizeof(struct nl4_server));
memcpy(&dst->stateid, &src->stateid, sizeof(src->stateid));
memcpy(&dst->c_fh, &src->c_fh, sizeof(src->c_fh));
dst->ss_mnt = src->ss_mnt;
dst->ss_nsui = src->ss_nsui;
}
static void cleanup_async_copy(struct nfsd4_copy *copy)
@ -1762,8 +1740,8 @@ static int nfsd4_do_async_copy(void *data)
if (nfsd4_ssc_is_inter(copy)) {
struct file *filp;
filp = nfs42_ssc_open(copy->ss_mnt, &copy->c_fh,
&copy->stateid);
filp = nfs42_ssc_open(copy->ss_nsui->nsui_vfsmount,
&copy->c_fh, &copy->stateid);
if (IS_ERR(filp)) {
switch (PTR_ERR(filp)) {
case -EBADF:
@ -1777,7 +1755,7 @@ static int nfsd4_do_async_copy(void *data)
}
nfserr = nfsd4_do_copy(copy, filp, copy->nf_dst->nf_file,
false);
nfsd4_cleanup_inter_ssc(copy->ss_mnt, filp, copy->nf_dst);
nfsd4_cleanup_inter_ssc(copy->ss_nsui, filp, copy->nf_dst);
} else {
nfserr = nfsd4_do_copy(copy, copy->nf_src->nf_file,
copy->nf_dst->nf_file, false);
@ -1803,8 +1781,7 @@ nfsd4_copy(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
status = nfserr_notsupp;
goto out;
}
status = nfsd4_setup_inter_ssc(rqstp, cstate, copy,
&copy->ss_mnt);
status = nfsd4_setup_inter_ssc(rqstp, cstate, copy);
if (status)
return nfserr_offload_denied;
} else {

2
fs/nfsd/xdr4.h
View File

@ -571,7 +571,7 @@ struct nfsd4_copy {
struct task_struct *copy_task;
refcount_t refcount;
struct vfsmount *ss_mnt;
struct nfsd4_ssc_umount_item *ss_nsui;
struct nfs_fh c_fh;
nfs4_stateid stateid;
};

2
include/linux/nfs_ssc.h
View File

@ -53,6 +53,7 @@ static inline void nfs42_ssc_close(struct file *filep)
if (nfs_ssc_client_tbl.ssc_nfs4_ops)
(*nfs_ssc_client_tbl.ssc_nfs4_ops->sco_close)(filep);
}
#endif
struct nfsd4_ssc_umount_item {
struct list_head nsui_list;
@ -66,7 +67,6 @@ struct nfsd4_ssc_umount_item {
struct vfsmount *nsui_vfsmount;
char nsui_ipaddr[RPC_MAX_ADDRBUFLEN + 1];
};
#endif
/*
* NFS_FS