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NFSv4: Ensure layout headers are RCU safe 

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
This commit is contained in:
Trond Myklebust 2020-02-18 17:14:40 -05:00
parent d911c57a19
commit cf6605d194
5 changed files with 13 additions and 11 deletions
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2
fs/nfs/blocklayout/blocklayout.c
View File

@ -476,7 +476,7 @@ static void bl_free_layout_hdr(struct pnfs_layout_hdr *lo)
err = ext_tree_remove(bl, true, 0, LLONG_MAX);
WARN_ON(err);
kfree(bl);
kfree_rcu(bl, bl_layout.plh_rcu);
}
static struct pnfs_layout_hdr *__bl_alloc_layout_hdr(struct inode *inode,

2
fs/nfs/filelayout/filelayout.c
View File

@ -1146,7 +1146,7 @@ filelayout_alloc_layout_hdr(struct inode *inode, gfp_t gfp_flags)
static void
filelayout_free_layout_hdr(struct pnfs_layout_hdr *lo)
{
kfree(FILELAYOUT_FROM_HDR(lo));
kfree_rcu(FILELAYOUT_FROM_HDR(lo), generic_hdr.plh_rcu);
}
static struct pnfs_ds_commit_info *

6
fs/nfs/flexfilelayout/flexfilelayout.c
View File

@ -59,14 +59,14 @@ ff_layout_alloc_layout_hdr(struct inode *inode, gfp_t gfp_flags)
static void
ff_layout_free_layout_hdr(struct pnfs_layout_hdr *lo)
{
struct nfs4_flexfile_layout *ffl = FF_LAYOUT_FROM_HDR(lo);
struct nfs4_ff_layout_ds_err *err, *n;
list_for_each_entry_safe(err, n, &FF_LAYOUT_FROM_HDR(lo)->error_list,
list) {
list_for_each_entry_safe(err, n, &ffl->error_list, list) {
list_del(&err->list);
kfree(err);
}
kfree(FF_LAYOUT_FROM_HDR(lo));
kfree_rcu(ffl, generic_hdr.plh_rcu);
}
static int decode_pnfs_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)

12
fs/nfs/pnfs.c
View File

@ -268,11 +268,11 @@ pnfs_free_layout_hdr(struct pnfs_layout_hdr *lo)
struct nfs_server *server = NFS_SERVER(lo->plh_inode);
struct pnfs_layoutdriver_type *ld = server->pnfs_curr_ld;
if (!list_empty(&lo->plh_layouts)) {
if (test_and_clear_bit(NFS_LAYOUT_HASHED, &lo->plh_flags)) {
struct nfs_client *clp = server->nfs_client;
spin_lock(&clp->cl_lock);
list_del_init(&lo->plh_layouts);
list_del_rcu(&lo->plh_layouts);
spin_unlock(&clp->cl_lock);
}
put_cred(lo->plh_lc_cred);
@ -784,7 +784,8 @@ pnfs_layout_bulk_destroy_byserver_locked(struct nfs_client *clp,
break;
inode = igrab(lo->plh_inode);
if (inode != NULL) {
list_del_init(&lo->plh_layouts);
if (test_and_clear_bit(NFS_LAYOUT_HASHED, &lo->plh_flags))
list_del_rcu(&lo->plh_layouts);
if (pnfs_layout_add_bulk_destroy_list(inode,
layout_list))
continue;
@ -1870,15 +1871,14 @@ static void pnfs_clear_first_layoutget(struct pnfs_layout_hdr *lo)
static void _add_to_server_list(struct pnfs_layout_hdr *lo,
struct nfs_server *server)
{
if (list_empty(&lo->plh_layouts)) {
if (!test_and_set_bit(NFS_LAYOUT_HASHED, &lo->plh_flags)) {
struct nfs_client *clp = server->nfs_client;
/* The lo must be on the clp list if there is any
* chance of a CB_LAYOUTRECALL(FILE) coming in.
*/
spin_lock(&clp->cl_lock);
if (list_empty(&lo->plh_layouts))
list_add_tail(&lo->plh_layouts, &server->layouts);
list_add_tail_rcu(&lo->plh_layouts, &server->layouts);
spin_unlock(&clp->cl_lock);
}
}

2
fs/nfs/pnfs.h
View File

@ -105,6 +105,7 @@ enum {
NFS_LAYOUT_INVALID_STID, /* layout stateid id is invalid */
NFS_LAYOUT_FIRST_LAYOUTGET, /* Serialize first layoutget */
NFS_LAYOUT_INODE_FREEING, /* The inode is being freed */
NFS_LAYOUT_HASHED, /* The layout visible */
};
enum layoutdriver_policy_flags {
@ -203,6 +204,7 @@ struct pnfs_layout_hdr {
loff_t plh_lwb; /* last write byte for layoutcommit */
const struct cred *plh_lc_cred; /* layoutcommit cred */
struct inode *plh_inode;
struct rcu_head plh_rcu;
};
struct pnfs_device {