diff options
| -rw-r--r-- | fs/nfsd/nfsctl.c | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c index 841c562991e8..2a99a0bf54f6 100644 --- a/fs/nfsd/nfsctl.c +++ b/fs/nfsd/nfsctl.c @@ -104,9 +104,23 @@ static ssize_t nfsctl_transaction_write(struct file *file, const char __user *bu return rv; } +static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos) +{ + if (! file->private_data) { + /* An attempt to read a transaction file without writing + * causes a 0-byte write so that the file can return + * state information + */ + ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos); + if (rv < 0) + return rv; + } + return simple_transaction_read(file, buf, size, pos); +} + static struct file_operations transaction_ops = { .write = nfsctl_transaction_write, - .read = simple_transaction_read, + .read = nfsctl_transaction_read, .release = simple_transaction_release, }; |