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nfs: use change attribute for NFS re-exports

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When exporting NFS, we may as well use the real change attribute
returned by the original server instead of faking up a change attribute
from the ctime.

Note we can't do that by setting I_VERSION--that would also turn on the
logic in iversion.h which treats the lower bit specially, and that
doesn't make sense for NFS.

So instead we define a new export operation for filesystems like NFS
that want to manage the change attribute themselves.

Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
This commit is contained in:
J. Bruce Fields
2021-01-29 14:26:29 -05:00
committed by Chuck Lever
parent 02591f9feb
commit 3cc55f4434
3 changed files with 23 additions and 1 deletions
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5
fs/nfsd/nfsfh.h
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@@ -12,6 +12,7 @@
#include <linux/sunrpc/svc.h>
#include <uapi/linux/nfsd/nfsfh.h>
#include <linux/iversion.h>
#include <linux/exportfs.h>
static inline __u32 ino_t_to_u32(ino_t ino)
{
@@ -264,7 +265,9 @@ fh_clear_wcc(struct svc_fh *fhp)
static inline u64 nfsd4_change_attribute(struct kstat *stat,
struct inode *inode)
{
if (IS_I_VERSION(inode)) {
if (inode->i_sb->s_export_op->fetch_iversion)
return inode->i_sb->s_export_op->fetch_iversion(inode);
else if (IS_I_VERSION(inode)) {
u64 chattr;
chattr = stat->ctime.tv_sec;