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Fix nfsd bugs, three in the new nfsd/clients/ code, one in the reply

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cache containerization.
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Merge tag 'nfsd-5.3-1' of git://linux-nfs.org/~bfields/linux

Pull nfsd fixes from Bruce Fields:
 "Fix nfsd bugs: three in the new nfsd/clients/ code, one in the reply
  cache containerization"

* tag 'nfsd-5.3-1' of git://linux-nfs.org/~bfields/linux:
  nfsd4: Fix kernel crash when reading proc file reply_cache_stats
  nfsd: initialize i_private before d_add
  nfsd: use i_wrlock instead of rcu for nfsdfs i_private
  nfsd: fix dentry leak upon mkdir failure.
This commit is contained in:
Linus Torvalds 2019-08-21 10:04:38 -07:00
commit 2babd34df2
2 changed files with 10 additions and 11 deletions
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2
fs/nfsd/nfscache.c
View File

@ -571,7 +571,7 @@ nfsd_cache_append(struct svc_rqst *rqstp, struct kvec *data)
*/
static int nfsd_reply_cache_stats_show(struct seq_file *m, void *v)
{
struct nfsd_net *nn = v;
struct nfsd_net *nn = m->private;
seq_printf(m, "max entries: %u\n", nn->max_drc_entries);
seq_printf(m, "num entries: %u\n",

19
fs/nfsd/nfsctl.c
View File

@ -1171,13 +1171,17 @@ static struct inode *nfsd_get_inode(struct super_block *sb, umode_t mode)
return inode;
}
static int __nfsd_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
static int __nfsd_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode, struct nfsdfs_client *ncl)
{
struct inode *inode;
inode = nfsd_get_inode(dir->i_sb, mode);
if (!inode)
return -ENOMEM;
if (ncl) {
inode->i_private = ncl;
kref_get(&ncl->cl_ref);
}
d_add(dentry, inode);
inc_nlink(dir);
fsnotify_mkdir(dir, dentry);
@ -1194,17 +1198,14 @@ static struct dentry *nfsd_mkdir(struct dentry *parent, struct nfsdfs_client *nc
dentry = d_alloc_name(parent, name);
if (!dentry)
goto out_err;
ret = __nfsd_mkdir(d_inode(parent), dentry, S_IFDIR | 0600);
ret = __nfsd_mkdir(d_inode(parent), dentry, S_IFDIR | 0600, ncl);
if (ret)
goto out_err;
if (ncl) {
d_inode(dentry)->i_private = ncl;
kref_get(&ncl->cl_ref);
}
out:
inode_unlock(dir);
return dentry;
out_err:
dput(dentry);
dentry = ERR_PTR(ret);
goto out;
}
@ -1214,11 +1215,9 @@ static void clear_ncl(struct inode *inode)
struct nfsdfs_client *ncl = inode->i_private;
inode->i_private = NULL;
synchronize_rcu();
kref_put(&ncl->cl_ref, ncl->cl_release);
}
static struct nfsdfs_client *__get_nfsdfs_client(struct inode *inode)
{
struct nfsdfs_client *nc = inode->i_private;
@ -1232,9 +1231,9 @@ struct nfsdfs_client *get_nfsdfs_client(struct inode *inode)
{
struct nfsdfs_client *nc;
rcu_read_lock();
inode_lock_shared(inode);
nc = __get_nfsdfs_client(inode);
rcu_read_unlock();
inode_unlock_shared(inode);
return nc;
}
/* from __rpc_unlink */