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NFSD: NFSv4 CLOSE should release an nfsd_file immediately

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The last close of a file should enable other accessors to open and
use that file immediately. Leaving the file open in the filecache
prevents other users from accessing that file until the filecache
garbage-collects the file -- sometimes that takes several seconds.

Reported-by: Wang Yugui <wangyugui@e16-tech.com>
Link: https://bugzilla.linux-nfs.org/show_bug.cgi?387
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
This commit is contained in:
Chuck Lever 2022-07-08 14:27:02 -04:00
parent b40a283947
commit 5e138c4a75
3 changed files with 21 additions and 2 deletions
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18
fs/nfsd/filecache.c
View File

@ -452,6 +452,24 @@ 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

@ -52,6 +52,7 @@ 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

@ -820,9 +820,9 @@ 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_put(f1);
nfsd_file_close(f1);
if (f2)
nfsd_file_put(f2);
nfsd_file_close(f2);
}
}