mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-27 11:19:37 +00:00
![Jeff Layton](/assets/img/avatar_default.png)
On most filesystems, there is no reason to delay reaping an nfsd_file just because its underlying inode is still under writeback. nfsd just relies on client activity or the local flusher threads to do writeback. The main exception is NFS, which flushes all of its dirty data on last close. Add a new EXPORT_OP_FLUSH_ON_CLOSE flag to allow filesystems to signal that they do this, and only skip closing files under writeback on such filesystems. Also, remove a redundant NULL file pointer check in nfsd_file_check_writeback, and clean up nfs's export op flag definitions. Signed-off-by: Jeff Layton <jlayton@kernel.org> Acked-by: Anna Schumaker <Anna.Schumaker@Netapp.com> Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
158 lines
3.9 KiB
C
158 lines
3.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Copyright (c) 2015, Primary Data, Inc. All rights reserved.
|
|
*
|
|
* Tao Peng <bergwolf@primarydata.com>
|
|
*/
|
|
#include <linux/dcache.h>
|
|
#include <linux/exportfs.h>
|
|
#include <linux/nfs.h>
|
|
#include <linux/nfs_fs.h>
|
|
|
|
#include "internal.h"
|
|
#include "nfstrace.h"
|
|
|
|
#define NFSDBG_FACILITY NFSDBG_VFS
|
|
|
|
enum {
|
|
FILEID_HIGH_OFF = 0, /* inode fileid high */
|
|
FILEID_LOW_OFF, /* inode fileid low */
|
|
FILE_I_TYPE_OFF, /* inode type */
|
|
EMBED_FH_OFF /* embeded server fh */
|
|
};
|
|
|
|
|
|
static struct nfs_fh *nfs_exp_embedfh(__u32 *p)
|
|
{
|
|
return (struct nfs_fh *)(p + EMBED_FH_OFF);
|
|
}
|
|
|
|
/*
|
|
* Let's break subtree checking for now... otherwise we'll have to embed parent fh
|
|
* but there might not be enough space.
|
|
*/
|
|
static int
|
|
nfs_encode_fh(struct inode *inode, __u32 *p, int *max_len, struct inode *parent)
|
|
{
|
|
struct nfs_fh *server_fh = NFS_FH(inode);
|
|
struct nfs_fh *clnt_fh = nfs_exp_embedfh(p);
|
|
size_t fh_size = offsetof(struct nfs_fh, data) + server_fh->size;
|
|
int len = EMBED_FH_OFF + XDR_QUADLEN(fh_size);
|
|
|
|
dprintk("%s: max fh len %d inode %p parent %p",
|
|
__func__, *max_len, inode, parent);
|
|
|
|
if (*max_len < len) {
|
|
dprintk("%s: fh len %d too small, required %d\n",
|
|
__func__, *max_len, len);
|
|
*max_len = len;
|
|
return FILEID_INVALID;
|
|
}
|
|
|
|
p[FILEID_HIGH_OFF] = NFS_FILEID(inode) >> 32;
|
|
p[FILEID_LOW_OFF] = NFS_FILEID(inode);
|
|
p[FILE_I_TYPE_OFF] = inode->i_mode & S_IFMT;
|
|
p[len - 1] = 0; /* Padding */
|
|
nfs_copy_fh(clnt_fh, server_fh);
|
|
*max_len = len;
|
|
dprintk("%s: result fh fileid %llu mode %u size %d\n",
|
|
__func__, NFS_FILEID(inode), inode->i_mode, *max_len);
|
|
return *max_len;
|
|
}
|
|
|
|
static struct dentry *
|
|
nfs_fh_to_dentry(struct super_block *sb, struct fid *fid,
|
|
int fh_len, int fh_type)
|
|
{
|
|
struct nfs_fattr *fattr = NULL;
|
|
struct nfs_fh *server_fh = nfs_exp_embedfh(fid->raw);
|
|
size_t fh_size = offsetof(struct nfs_fh, data) + server_fh->size;
|
|
const struct nfs_rpc_ops *rpc_ops;
|
|
struct dentry *dentry;
|
|
struct inode *inode;
|
|
int len = EMBED_FH_OFF + XDR_QUADLEN(fh_size);
|
|
u32 *p = fid->raw;
|
|
int ret;
|
|
|
|
/* NULL translates to ESTALE */
|
|
if (fh_len < len || fh_type != len)
|
|
return NULL;
|
|
|
|
fattr = nfs_alloc_fattr_with_label(NFS_SB(sb));
|
|
if (fattr == NULL) {
|
|
dentry = ERR_PTR(-ENOMEM);
|
|
goto out;
|
|
}
|
|
|
|
fattr->fileid = ((u64)p[FILEID_HIGH_OFF] << 32) + p[FILEID_LOW_OFF];
|
|
fattr->mode = p[FILE_I_TYPE_OFF];
|
|
fattr->valid |= NFS_ATTR_FATTR_FILEID | NFS_ATTR_FATTR_TYPE;
|
|
|
|
dprintk("%s: fileid %llu mode %d\n", __func__, fattr->fileid, fattr->mode);
|
|
|
|
inode = nfs_ilookup(sb, fattr, server_fh);
|
|
if (inode)
|
|
goto out_found;
|
|
|
|
rpc_ops = NFS_SB(sb)->nfs_client->rpc_ops;
|
|
ret = rpc_ops->getattr(NFS_SB(sb), server_fh, fattr, NULL);
|
|
if (ret) {
|
|
dprintk("%s: getattr failed %d\n", __func__, ret);
|
|
trace_nfs_fh_to_dentry(sb, server_fh, fattr->fileid, ret);
|
|
dentry = ERR_PTR(ret);
|
|
goto out_free_fattr;
|
|
}
|
|
|
|
inode = nfs_fhget(sb, server_fh, fattr);
|
|
|
|
out_found:
|
|
dentry = d_obtain_alias(inode);
|
|
out_free_fattr:
|
|
nfs_free_fattr(fattr);
|
|
out:
|
|
return dentry;
|
|
}
|
|
|
|
static struct dentry *
|
|
nfs_get_parent(struct dentry *dentry)
|
|
{
|
|
int ret;
|
|
struct inode *inode = d_inode(dentry), *pinode;
|
|
struct super_block *sb = inode->i_sb;
|
|
struct nfs_server *server = NFS_SB(sb);
|
|
struct nfs_fattr *fattr = NULL;
|
|
struct dentry *parent;
|
|
struct nfs_rpc_ops const *ops = server->nfs_client->rpc_ops;
|
|
struct nfs_fh fh;
|
|
|
|
if (!ops->lookupp)
|
|
return ERR_PTR(-EACCES);
|
|
|
|
fattr = nfs_alloc_fattr_with_label(server);
|
|
if (fattr == NULL)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
ret = ops->lookupp(inode, &fh, fattr);
|
|
if (ret) {
|
|
parent = ERR_PTR(ret);
|
|
goto out;
|
|
}
|
|
|
|
pinode = nfs_fhget(sb, &fh, fattr);
|
|
parent = d_obtain_alias(pinode);
|
|
out:
|
|
nfs_free_fattr(fattr);
|
|
return parent;
|
|
}
|
|
|
|
const struct export_operations nfs_export_ops = {
|
|
.encode_fh = nfs_encode_fh,
|
|
.fh_to_dentry = nfs_fh_to_dentry,
|
|
.get_parent = nfs_get_parent,
|
|
.flags = EXPORT_OP_NOWCC |
|
|
EXPORT_OP_NOSUBTREECHK |
|
|
EXPORT_OP_CLOSE_BEFORE_UNLINK |
|
|
EXPORT_OP_REMOTE_FS |
|
|
EXPORT_OP_NOATOMIC_ATTR |
|
|
EXPORT_OP_FLUSH_ON_CLOSE,
|
|
};
|