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nfsd: formally deprecate legacy nfsd syscall interface 

The syscall interface is has been replaced by a more flexible
interface since 2.6.0.  It is time to work towards discarding
the old interface.

So add a entry in feature-removal-schedule.txt and print a warning
when the interface is used.

Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
NeilBrown 2010-09-22 12:55:07 +10:00 committed by J. Bruce Fields
parent e95dffa430
commit c67874f942
2 changed files with 20 additions and 0 deletions
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10
Documentation/feature-removal-schedule.txt
View File

@ -564,3 +564,13 @@ Who: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
----------------------------
What: access to nfsd auth cache through sys_nfsservctl or '.' files
in the 'nfsd' filesystem.
When: 2.6.40
Why: This is a legacy interface which have been replaced by a more
dynamic cache. Continuing to maintain this interface is an
unnecessary burden.
Who: NeilBrown <neilb@suse.de>
----------------------------

10
fs/nfsd/nfsctl.c
View File

@ -121,6 +121,16 @@ static ssize_t nfsctl_transaction_write(struct file *file, const char __user *bu
static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos)
{
static int warned;
if (file->f_dentry->d_name.name[0] == '.' && !warned) {
char name[sizeof(current->comm)];
printk(KERN_INFO
"Warning: \"%s\" uses deprecated NFSD interface: %s."
" This will be removed in 2.6.40\n",
get_task_comm(name, current),
file->f_dentry->d_name.name);
warned = 1;
}
if (! file->private_data) {
/* An attempt to read a transaction file without writing
* causes a 0-byte write so that the file can return