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nfsd: make nfs4_client_reclaim use an xdr_netobj instead of a fixed char array

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This will allow the reclaim_str_hashtbl to store either the recovery
directory names used by the legacy client tracking code or the full
client strings used by the nfsdcld client tracking code.

Signed-off-by: Scott Mayhew <smayhew@redhat.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Scott Mayhew 2019-03-26 18:06:26 -04:00 committed by J. Bruce Fields
parent 9d69338c8c
commit 6b1891052a
3 changed files with 110 additions and 37 deletions
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109
fs/nfsd/nfs4recover.c
View File

@ -169,13 +169,34 @@ legacy_recdir_name_error(struct nfs4_client *clp, int error)
}
}
static void
__nfsd4_create_reclaim_record_grace(struct nfs4_client *clp,
const char *dname, int len, struct nfsd_net *nn)
{
struct xdr_netobj name;
struct nfs4_client_reclaim *crp;
name.data = kmemdup(dname, len, GFP_KERNEL);
if (!name.data) {
dprintk("%s: failed to allocate memory for name.data!\n",
__func__);
return;
}
name.len = len;
crp = nfs4_client_to_reclaim(name, nn);
if (!crp) {
kfree(name.data);
return;
}
crp->cr_clp = clp;
}
static void
nfsd4_create_clid_dir(struct nfs4_client *clp)
{
const struct cred *original_cred;
char dname[HEXDIR_LEN];
struct dentry *dir, *dentry;
struct nfs4_client_reclaim *crp;
int status;
struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
@ -221,11 +242,9 @@ out_put:
out_unlock:
inode_unlock(d_inode(dir));
if (status == 0) {
if (nn->in_grace) {
crp = nfs4_client_to_reclaim(dname, nn);
if (crp)
crp->cr_clp = clp;
}
if (nn->in_grace)
__nfsd4_create_reclaim_record_grace(clp, dname,
HEXDIR_LEN, nn);
vfs_fsync(nn->rec_file, 0);
} else {
printk(KERN_ERR "NFSD: failed to write recovery record"
@ -345,11 +364,30 @@ out_unlock:
return status;
}
static void
__nfsd4_remove_reclaim_record_grace(const char *dname, int len,
struct nfsd_net *nn)
{
struct xdr_netobj name;
struct nfs4_client_reclaim *crp;
name.data = kmemdup(dname, len, GFP_KERNEL);
if (!name.data) {
dprintk("%s: failed to allocate memory for name.data!\n",
__func__);
return;
}
name.len = len;
crp = nfsd4_find_reclaim_client(name, nn);
kfree(name.data);
if (crp)
nfs4_remove_reclaim_record(crp, nn);
}
static void
nfsd4_remove_clid_dir(struct nfs4_client *clp)
{
const struct cred *original_cred;
struct nfs4_client_reclaim *crp;
char dname[HEXDIR_LEN];
int status;
struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
@ -374,12 +412,9 @@ nfsd4_remove_clid_dir(struct nfs4_client *clp)
nfs4_reset_creds(original_cred);
if (status == 0) {
vfs_fsync(nn->rec_file, 0);
if (nn->in_grace) {
/* remove reclaim record */
crp = nfsd4_find_reclaim_client(dname, nn);
if (crp)
nfs4_remove_reclaim_record(crp, nn);
}
if (nn->in_grace)
__nfsd4_remove_reclaim_record_grace(dname,
HEXDIR_LEN, nn);
}
out_drop_write:
mnt_drop_write_file(nn->rec_file);
@ -393,14 +428,31 @@ static int
purge_old(struct dentry *parent, struct dentry *child, struct nfsd_net *nn)
{
int status;
struct xdr_netobj name;
if (nfs4_has_reclaimed_state(child->d_name.name, nn))
if (child->d_name.len != HEXDIR_LEN - 1) {
printk("%s: illegal name %pd in recovery directory\n",
__func__, child);
/* Keep trying; maybe the others are OK: */
return 0;
}
name.data = kmemdup_nul(child->d_name.name, child->d_name.len, GFP_KERNEL);
if (!name.data) {
dprintk("%s: failed to allocate memory for name.data!\n",
__func__);
goto out;
}
name.len = HEXDIR_LEN;
if (nfs4_has_reclaimed_state(name, nn))
goto out_free;
status = vfs_rmdir(d_inode(parent), child);
if (status)
printk("failed to remove client recovery directory %pd\n",
child);
out_free:
kfree(name.data);
out:
/* Keep trying, success or failure: */
return 0;
}
@ -430,13 +482,24 @@ out:
static int
load_recdir(struct dentry *parent, struct dentry *child, struct nfsd_net *nn)
{
struct xdr_netobj name;
if (child->d_name.len != HEXDIR_LEN - 1) {
printk("nfsd4: illegal name %pd in recovery directory\n",
child);
printk("%s: illegal name %pd in recovery directory\n",
__func__, child);
/* Keep trying; maybe the others are OK: */
return 0;
}
nfs4_client_to_reclaim(child->d_name.name, nn);
name.data = kmemdup_nul(child->d_name.name, child->d_name.len, GFP_KERNEL);
if (!name.data) {
dprintk("%s: failed to allocate memory for name.data!\n",
__func__);
goto out;
}
name.len = HEXDIR_LEN;
if (!nfs4_client_to_reclaim(name, nn))
kfree(name.data);
out:
return 0;
}
@ -616,6 +679,7 @@ nfsd4_check_legacy_client(struct nfs4_client *clp)
char dname[HEXDIR_LEN];
struct nfs4_client_reclaim *crp;
struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
struct xdr_netobj name;
/* did we already find that this client is stable? */
if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
@ -628,13 +692,22 @@ nfsd4_check_legacy_client(struct nfs4_client *clp)
}
/* look for it in the reclaim hashtable otherwise */
crp = nfsd4_find_reclaim_client(dname, nn);
name.data = kmemdup(dname, HEXDIR_LEN, GFP_KERNEL);
if (!name.data) {
dprintk("%s: failed to allocate memory for name.data!\n",
__func__);
goto out_enoent;
}
name.len = HEXDIR_LEN;
crp = nfsd4_find_reclaim_client(name, nn);
kfree(name.data);
if (crp) {
set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
crp->cr_clp = clp;
return 0;
}
out_enoent:
return -ENOENT;
}

30
fs/nfsd/nfs4state.c
View File

@ -1067,9 +1067,9 @@ static unsigned int clientid_hashval(u32 id)
return id & CLIENT_HASH_MASK;
}
static unsigned int clientstr_hashval(const char *name)
static unsigned int clientstr_hashval(struct xdr_netobj name)
{
return opaque_hashval(name, 8) & CLIENT_HASH_MASK;
return opaque_hashval(name.data, 8) & CLIENT_HASH_MASK;
}
/*
@ -2048,11 +2048,6 @@ compare_blob(const struct xdr_netobj *o1, const struct xdr_netobj *o2)
return memcmp(o1->data, o2->data, o1->len);
}
static int same_name(const char *n1, const char *n2)
{
return 0 == memcmp(n1, n2, HEXDIR_LEN);
}
static int
same_verf(nfs4_verifier *v1, nfs4_verifier *v2)
{
@ -6457,7 +6452,7 @@ alloc_reclaim(void)
}
bool
nfs4_has_reclaimed_state(const char *name, struct nfsd_net *nn)
nfs4_has_reclaimed_state(struct xdr_netobj name, struct nfsd_net *nn)
{
struct nfs4_client_reclaim *crp;
@ -6467,20 +6462,24 @@ nfs4_has_reclaimed_state(const char *name, struct nfsd_net *nn)
/*
* failure => all reset bets are off, nfserr_no_grace...
*
* The caller is responsible for freeing name.data if NULL is returned (it
* will be freed in nfs4_remove_reclaim_record in the normal case).
*/
struct nfs4_client_reclaim *
nfs4_client_to_reclaim(const char *name, struct nfsd_net *nn)
nfs4_client_to_reclaim(struct xdr_netobj name, struct nfsd_net *nn)
{
unsigned int strhashval;
struct nfs4_client_reclaim *crp;
dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", name.len, name.data);
crp = alloc_reclaim();
if (crp) {
strhashval = clientstr_hashval(name);
INIT_LIST_HEAD(&crp->cr_strhash);
list_add(&crp->cr_strhash, &nn->reclaim_str_hashtbl[strhashval]);
memcpy(crp->cr_recdir, name, HEXDIR_LEN);
crp->cr_name.data = name.data;
crp->cr_name.len = name.len;
crp->cr_clp = NULL;
nn->reclaim_str_hashtbl_size++;
}
@ -6491,6 +6490,7 @@ void
nfs4_remove_reclaim_record(struct nfs4_client_reclaim *crp, struct nfsd_net *nn)
{
list_del(&crp->cr_strhash);
kfree(crp->cr_name.data);
kfree(crp);
nn->reclaim_str_hashtbl_size--;
}
@ -6514,16 +6514,16 @@ nfs4_release_reclaim(struct nfsd_net *nn)
/*
* called from OPEN, CLAIM_PREVIOUS with a new clientid. */
struct nfs4_client_reclaim *
nfsd4_find_reclaim_client(const char *recdir, struct nfsd_net *nn)
nfsd4_find_reclaim_client(struct xdr_netobj name, struct nfsd_net *nn)
{
unsigned int strhashval;
struct nfs4_client_reclaim *crp = NULL;
dprintk("NFSD: nfs4_find_reclaim_client for recdir %s\n", recdir);
dprintk("NFSD: nfs4_find_reclaim_client for name %.*s\n", name.len, name.data);
strhashval = clientstr_hashval(recdir);
strhashval = clientstr_hashval(name);
list_for_each_entry(crp, &nn->reclaim_str_hashtbl[strhashval], cr_strhash) {
if (same_name(crp->cr_recdir, recdir)) {
if (compare_blob(&crp->cr_name, &name) == 0) {
return crp;
}
}

8
fs/nfsd/state.h
View File

@ -368,7 +368,7 @@ struct nfs4_client {
struct nfs4_client_reclaim {
struct list_head cr_strhash; /* hash by cr_name */
struct nfs4_client *cr_clp; /* pointer to associated clp */
char cr_recdir[HEXDIR_LEN]; /* recover dir */
struct xdr_netobj cr_name; /* recovery dir name */
};
/* A reasonable value for REPLAY_ISIZE was estimated as follows:
@ -620,7 +620,7 @@ void nfs4_put_stid(struct nfs4_stid *s);
void nfs4_inc_and_copy_stateid(stateid_t *dst, struct nfs4_stid *stid);
void nfs4_remove_reclaim_record(struct nfs4_client_reclaim *, struct nfsd_net *);
extern void nfs4_release_reclaim(struct nfsd_net *);
extern struct nfs4_client_reclaim *nfsd4_find_reclaim_client(const char *recdir,
extern struct nfs4_client_reclaim *nfsd4_find_reclaim_client(struct xdr_netobj name,
struct nfsd_net *nn);
extern __be32 nfs4_check_open_reclaim(clientid_t *clid,
struct nfsd4_compound_state *cstate, struct nfsd_net *nn);
@ -635,9 +635,9 @@ extern void nfsd4_destroy_callback_queue(void);
extern void nfsd4_shutdown_callback(struct nfs4_client *);
extern void nfsd4_shutdown_copy(struct nfs4_client *clp);
extern void nfsd4_prepare_cb_recall(struct nfs4_delegation *dp);
extern struct nfs4_client_reclaim *nfs4_client_to_reclaim(const char *name,
extern struct nfs4_client_reclaim *nfs4_client_to_reclaim(struct xdr_netobj name,
struct nfsd_net *nn);
extern bool nfs4_has_reclaimed_state(const char *name, struct nfsd_net *nn);
extern bool nfs4_has_reclaimed_state(struct xdr_netobj name, struct nfsd_net *nn);
struct nfs4_file *find_file(struct knfsd_fh *fh);
void put_nfs4_file(struct nfs4_file *fi);