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nfs: clean up ->create in nfs_rpc_ops

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Don't pass nfs_open_context() to ->create().  Only the NFS4 implementation
needed that and only because it wanted to return an open file using open
intents.  That task has been replaced by ->atomic_open so it is not necessary
anymore to pass the context to the create rpc operation.

Despite nfs4_proc_create apparently being okay with a NULL context it Oopses
somewhere down the call chain.  So allocate a context here.

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
CC: Trond Myklebust <Trond.Myklebust@netapp.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Miklos Szeredi 2012-06-05 15:10:19 +02:00 committed by Al Viro
parent 0dd2b474d0
commit 8867fe5899
5 changed files with 15 additions and 70 deletions
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42
fs/nfs/dir.c
View File

@ -114,10 +114,8 @@ const struct inode_operations nfs3_dir_inode_operations = {
static struct file *nfs_atomic_open(struct inode *, struct dentry *,
struct opendata *, unsigned, umode_t,
bool *);
static int nfs4_create(struct inode *dir, struct dentry *dentry,
umode_t mode, struct nameidata *nd);
const struct inode_operations nfs4_dir_inode_operations = {
.create = nfs4_create,
.create = nfs_create,
.lookup = nfs_lookup,
.atomic_open = nfs_atomic_open,
.link = nfs_link,
@ -1582,42 +1580,6 @@ static int nfs4_lookup_revalidate(struct dentry *dentry, struct nameidata *nd)
return nfs_lookup_revalidate(dentry, nd);
}
static int nfs4_create(struct inode *dir, struct dentry *dentry,
umode_t mode, struct nameidata *nd)
{
struct nfs_open_context *ctx = NULL;
struct iattr attr;
int error;
int open_flags = O_CREAT|O_EXCL;
dfprintk(VFS, "NFS: create(%s/%ld), %s\n",
dir->i_sb->s_id, dir->i_ino, dentry->d_name.name);
attr.ia_mode = mode;
attr.ia_valid = ATTR_MODE;
if (nd)
open_flags = nd->intent.open.flags;
ctx = create_nfs_open_context(dentry, open_flags);
error = PTR_ERR(ctx);
if (IS_ERR(ctx))
goto out_err_drop;
error = NFS_PROTO(dir)->create(dir, dentry, &attr, open_flags, ctx);
if (error != 0)
goto out_put_ctx;
put_nfs_open_context(ctx);
return 0;
out_put_ctx:
put_nfs_open_context(ctx);
out_err_drop:
d_drop(dentry);
return error;
}
#endif /* CONFIG_NFSV4 */
/*
@ -1684,7 +1646,7 @@ static int nfs_create(struct inode *dir, struct dentry *dentry,
if (nd)
open_flags = nd->intent.open.flags;
error = NFS_PROTO(dir)->create(dir, dentry, &attr, open_flags, NULL);
error = NFS_PROTO(dir)->create(dir, dentry, &attr, open_flags);
if (error != 0)
goto out_err;
return 0;

2
fs/nfs/nfs3proc.c
View File

@ -314,7 +314,7 @@ static void nfs3_free_createdata(struct nfs3_createdata *data)
*/
static int
nfs3_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
int flags, struct nfs_open_context *ctx)
int flags)
{
struct nfs3_createdata *data;
umode_t mode = sattr->ia_mode;

37
fs/nfs/nfs4proc.c
View File

@ -2806,37 +2806,22 @@ static int nfs4_proc_readlink(struct inode *inode, struct page *page,
}
/*
* Got race?
* We will need to arrange for the VFS layer to provide an atomic open.
* Until then, this create/open method is prone to inefficiency and race
* conditions due to the lookup, create, and open VFS calls from sys_open()
* placed on the wire.
*
* Given the above sorry state of affairs, I'm simply sending an OPEN.
* The file will be opened again in the subsequent VFS open call
* (nfs4_proc_file_open).
*
* The open for read will just hang around to be used by any process that
* opens the file O_RDONLY. This will all be resolved with the VFS changes.
* This is just for mknod. open(O_CREAT) will always do ->open_context().
*/
static int
nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
int flags, struct nfs_open_context *ctx)
int flags)
{
struct dentry *de = dentry;
struct nfs_open_context *ctx;
struct nfs4_state *state;
struct rpc_cred *cred = NULL;
fmode_t fmode = 0;
int status = 0;
if (ctx != NULL) {
cred = ctx->cred;
de = ctx->dentry;
fmode = ctx->mode;
}
ctx = alloc_nfs_open_context(dentry, FMODE_READ);
if (IS_ERR(ctx))
return PTR_ERR(ctx);
sattr->ia_mode &= ~current_umask();
state = nfs4_do_open(dir, de, fmode, flags, sattr, cred, NULL);
state = nfs4_do_open(dir, dentry, ctx->mode, flags, sattr, ctx->cred, NULL);
d_drop(dentry);
if (IS_ERR(state)) {
status = PTR_ERR(state);
@ -2844,11 +2829,9 @@ nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
}
d_add(dentry, igrab(state->inode));
nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
if (ctx != NULL)
ctx->state = state;
else
nfs4_close_sync(state, fmode);
ctx->state = state;
out:
put_nfs_open_context(ctx);
return status;
}

2
fs/nfs/proc.c
View File

@ -259,7 +259,7 @@ static void nfs_free_createdata(const struct nfs_createdata *data)
static int
nfs_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
int flags, struct nfs_open_context *ctx)
int flags)
{
struct nfs_createdata *data;
struct rpc_message msg = {

2
include/linux/nfs_xdr.h
View File

@ -1374,7 +1374,7 @@ struct nfs_rpc_ops {
int (*readlink)(struct inode *, struct page *, unsigned int,
unsigned int);
int (*create) (struct inode *, struct dentry *,
struct iattr *, int, struct nfs_open_context *);
struct iattr *, int);
int (*remove) (struct inode *, struct qstr *);
void (*unlink_setup) (struct rpc_message *, struct inode *dir);
void (*unlink_rpc_prepare) (struct rpc_task *, struct nfs_unlinkdata *);