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NFSD: Revert "NFSD: NFSv4 CLOSE should release an nfsd_file immediately"

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[ Upstream commit dcf3f80965 ]

This reverts commit 5e138c4a75.

That commit attempted to make files available to other users as soon
as all NFSv4 clients were done with them, rather than waiting until
the filecache LRU had garbage collected them.

It gets the reference counting wrong, for one thing.

But it also misses that DELEGRETURN should release a file in the
same fashion. In fact, any nfsd_file_put() on an file held open
by an NFSv4 client needs potentially to release the file
immediately...

Clear the way for implementing that idea.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: NeilBrown <neilb@suse.de>
Stable-dep-of: 0b3a551fa5 ("nfsd: fix handling of cached open files in nfsd4_open codepath")
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Chuck Lever 2022-10-28 10:46:44 -04:00 committed by Greg Kroah-Hartman
parent 90d5095b76
commit 7e4d3d5004
3 changed files with 2 additions and 21 deletions
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18
fs/nfsd/filecache.c
View file

@ -444,24 +444,6 @@ nfsd_file_put(struct nfsd_file *nf)
nfsd_file_put_noref(nf);
}
/**
* nfsd_file_close - Close an nfsd_file
* @nf: nfsd_file to close
*
* If this is the final reference for @nf, free it immediately.
* This reflects an on-the-wire CLOSE or DELEGRETURN into the
* VFS and exported filesystem.
*/
void nfsd_file_close(struct nfsd_file *nf)
{
nfsd_file_put(nf);
if (refcount_dec_if_one(&nf->nf_ref)) {
nfsd_file_unhash(nf);
nfsd_file_lru_remove(nf);
nfsd_file_free(nf);
}
}
struct nfsd_file *
nfsd_file_get(struct nfsd_file *nf)
{

1
fs/nfsd/filecache.h
View file

@ -52,7 +52,6 @@ void nfsd_file_cache_shutdown(void);
int nfsd_file_cache_start_net(struct net *net);
void nfsd_file_cache_shutdown_net(struct net *net);
void nfsd_file_put(struct nfsd_file *nf);
void nfsd_file_close(struct nfsd_file *nf);
struct nfsd_file *nfsd_file_get(struct nfsd_file *nf);
void nfsd_file_close_inode_sync(struct inode *inode);
bool nfsd_file_is_cached(struct inode *inode);

4
fs/nfsd/nfs4state.c
View file

@ -842,9 +842,9 @@ static void __nfs4_file_put_access(struct nfs4_file *fp, int oflag)
swap(f2, fp->fi_fds[O_RDWR]);
spin_unlock(&fp->fi_lock);
if (f1)
nfsd_file_close(f1);
nfsd_file_put(f1);
if (f2)
nfsd_file_close(f2);
nfsd_file_put(f2);
}
}