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SubjectRe: [patch 12/13] ACL umask handling workaround in nfs client
From
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ty den 22.02.2005 Klokka 17:47 (+0100) skreiv Andreas Gruenbacher:

> See attached patch.
>

It would be very nice if we could rather hide the calls to
nfs_set_default_acl() inside nfs3_proc_create(), nfs3_proc_mknod() and
nfs3_proc-mkdir(). Besides avoiding the need for the wrapper functions,
that also means that all calls to ->mknod(), ->mkdir() and ->create()
are guaranteed to do the right thing.

How about if we change the interfaces for NFS_PROTO()->mknod(), and
mkdir, so that they take a dentry argument instead of the struct qstr,
and then have them instantiate the dentry? The appended (untested) patch
tries to do this for mknod()...
(This is a cleanup we have pretty much already done for ->create() BTW)

> Well, everything but the umask is always correct; that is guaranteed by
> the server. The initial create sets permissions that may be more
> restrictive than necessary, and then the SETACL RPC sets up the final,
> correct permissions. I don't believe that a race-free solution is
> possible.

If the permissions are guaranteed always to be more restrictive, then
that's OK (in fact the NFS protocol mandates that we do something
similar when it comes to O_EXCL opens).
I just wanted to be sure this was indeed the case.

Cheers,
Trond

--
Trond Myklebust <trond.myklebust@fys.uio.no>
fs/nfs/dir.c | 20 +++++++++-----------
fs/nfs/nfs3proc.c | 23 +++++++++++++----------
fs/nfs/nfs4proc.c | 25 +++++++++++++------------
fs/nfs/proc.c | 24 ++++++++++++++----------
include/linux/nfs_fs.h | 2 ++
include/linux/nfs_xdr.h | 4 ++--
6 files changed, 53 insertions(+), 45 deletions(-)

Index: linux-2.6.11-rc4/fs/nfs/nfs3proc.c
===================================================================
--- linux-2.6.11-rc4.orig/fs/nfs/nfs3proc.c
+++ linux-2.6.11-rc4/fs/nfs/nfs3proc.c
@@ -639,23 +639,24 @@ nfs3_proc_readdir(struct dentry *dentry,
}

static int
-nfs3_proc_mknod(struct inode *dir, struct qstr *name, struct iattr *sattr,
- dev_t rdev, struct nfs_fh *fh, struct nfs_fattr *fattr)
+nfs3_proc_mknod(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
+ dev_t rdev)
{
- struct nfs_fattr dir_attr;
+ struct nfs_fh fh;
+ struct nfs_fattr fattr, dir_attr;
struct nfs3_mknodargs arg = {
.fh = NFS_FH(dir),
- .name = name->name,
- .len = name->len,
+ .name = dentry->d_name.name,
+ .len = dentry->name.len,
.sattr = sattr,
.rdev = rdev
};
struct nfs3_diropres res = {
.dir_attr = &dir_attr,
- .fh = fh,
- .fattr = fattr
+ .fh = &fh,
+ .fattr = &fattr
};
- int status;
+ int status;

switch (sattr->ia_mode & S_IFMT) {
case S_IFBLK: arg.type = NF3BLK; break;
@@ -665,12 +666,14 @@ nfs3_proc_mknod(struct inode *dir, struc
default: return -EINVAL;
}

- dprintk("NFS call mknod %s %u:%u\n", name->name,
+ dprintk("NFS call mknod %s %u:%u\n", dentry->d_name.name,
MAJOR(rdev), MINOR(rdev));
dir_attr.valid = 0;
- fattr->valid = 0;
+ fattr.valid = 0;
status = rpc_call(NFS_CLIENT(dir), NFS3PROC_MKNOD, &arg, &res, 0);
nfs_refresh_inode(dir, &dir_attr);
+ if (status == 0)
+ status = nfs_instantiate(dentry, &fh, &fattr);
dprintk("NFS reply mknod: %d\n", status);
return status;
}
Index: linux-2.6.11-rc4/fs/nfs/nfs4proc.c
===================================================================
--- linux-2.6.11-rc4.orig/fs/nfs/nfs4proc.c
+++ linux-2.6.11-rc4/fs/nfs/nfs4proc.c
@@ -1630,22 +1630,23 @@ static int nfs4_proc_readdir(struct dent
return err;
}

-static int _nfs4_proc_mknod(struct inode *dir, struct qstr *name,
- struct iattr *sattr, dev_t rdev, struct nfs_fh *fh,
- struct nfs_fattr *fattr)
+static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
+ struct iattr *sattr, dev_t rdev)
{
struct nfs_server *server = NFS_SERVER(dir);
+ struct nfs_fh fh;
+ struct nfs_fattr fattr;
struct nfs4_create_arg arg = {
.dir_fh = NFS_FH(dir),
.server = server,
- .name = name,
+ .name = &dentry->d_name,
.attrs = sattr,
.bitmask = server->attr_bitmask,
};
struct nfs4_create_res res = {
.server = server,
- .fh = fh,
- .fattr = fattr,
+ .fh = &fh,
+ .fattr = &fattr,
};
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
@@ -1655,7 +1656,7 @@ static int _nfs4_proc_mknod(struct inode
int status;
int mode = sattr->ia_mode;

- fattr->valid = 0;
+ fattr.valid = 0;

BUG_ON(!(sattr->ia_valid & ATTR_MODE));
BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
@@ -1677,19 +1678,19 @@ static int _nfs4_proc_mknod(struct inode
status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
if (!status)
update_changeattr(dir, &res.dir_cinfo);
+ if (status == 0)
+ status = nfs_instantiate(dentry, &fh, &fattr);
return status;
}

-static int nfs4_proc_mknod(struct inode *dir, struct qstr *name,
- struct iattr *sattr, dev_t rdev, struct nfs_fh *fh,
- struct nfs_fattr *fattr)
+static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
+ struct iattr *sattr, dev_t rdev)
{
struct nfs4_exception exception = { };
int err;
do {
err = nfs4_handle_exception(NFS_SERVER(dir),
- _nfs4_proc_mknod(dir, name, sattr, rdev,
- fh, fattr),
+ _nfs4_proc_mknod(dir, dentry, sattr, rdev),
&exception);
} while (exception.retry);
return err;
Index: linux-2.6.11-rc4/fs/nfs/proc.c
===================================================================
--- linux-2.6.11-rc4.orig/fs/nfs/proc.c
+++ linux-2.6.11-rc4/fs/nfs/proc.c
@@ -248,22 +248,24 @@ nfs_proc_create(struct inode *dir, struc
* In NFSv2, mknod is grafted onto the create call.
*/
static int
-nfs_proc_mknod(struct inode *dir, struct qstr *name, struct iattr *sattr,
- dev_t rdev, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
+nfs_proc_mknod(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
+ dev_t rdev)
{
+ struct nfs_fh fhandle;
+ struct nfs_fattr fattr;
struct nfs_createargs arg = {
.fh = NFS_FH(dir),
- .name = name->name,
- .len = name->len,
+ .name = dentry->d_name.name,
+ .len = dentry->d_name.len,
.sattr = sattr
};
struct nfs_diropok res = {
- .fh = fhandle,
- .fattr = fattr
+ .fh = &fhandle,
+ .fattr = &fattr
};
- int status, mode;
+ int status, mode;

- dprintk("NFS call mknod %s\n", name->name);
+ dprintk("NFS call mknod %s\n", dentry->d_name.name);

mode = sattr->ia_mode;
if (S_ISFIFO(mode)) {
@@ -274,14 +276,16 @@ nfs_proc_mknod(struct inode *dir, struct
sattr->ia_size = new_encode_dev(rdev);/* get out your barf bag */
}

- fattr->valid = 0;
+ fattr.valid = 0;
status = rpc_call(NFS_CLIENT(dir), NFSPROC_CREATE, &arg, &res, 0);

if (status == -EINVAL && S_ISFIFO(mode)) {
sattr->ia_mode = mode;
- fattr->valid = 0;
+ fattr.valid = 0;
status = rpc_call(NFS_CLIENT(dir), NFSPROC_CREATE, &arg, &res, 0);
}
+ if (status == 0)
+ status = nfs_instantiate(dentry, &fhandle, &fattr);
dprintk("NFS reply mknod: %d\n", status);
return status;
}
Index: linux-2.6.11-rc4/fs/nfs/dir.c
===================================================================
--- linux-2.6.11-rc4.orig/fs/nfs/dir.c
+++ linux-2.6.11-rc4/fs/nfs/dir.c
@@ -938,7 +938,7 @@ static struct dentry *nfs_readdir_lookup
/*
* Code common to create, mkdir, and mknod.
*/
-static int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fhandle,
+int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fhandle,
struct nfs_fattr *fattr)
{
struct inode *inode;
@@ -1019,9 +1019,7 @@ static int
nfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev)
{
struct iattr attr;
- struct nfs_fattr fattr;
- struct nfs_fh fhandle;
- int error;
+ int status;

dfprintk(VFS, "NFS: mknod(%s/%ld, %s\n", dir->i_sb->s_id,
dir->i_ino, dentry->d_name.name);
@@ -1034,15 +1032,15 @@ nfs_mknod(struct inode *dir, struct dent

lock_kernel();
nfs_begin_data_update(dir);
- error = NFS_PROTO(dir)->mknod(dir, &dentry->d_name, &attr, rdev,
- &fhandle, &fattr);
+ status = NFS_PROTO(dir)->mknod(dir, dentry, &attr, rdev);
nfs_end_data_update(dir);
- if (!error)
- error = nfs_instantiate(dentry, &fhandle, &fattr);
- else
- d_drop(dentry);
unlock_kernel();
- return error;
+ if (status != 0)
+ goto out_err;
+ return 0;
+out_err:
+ d_drop(dentry);
+ return status;
}

/*
Index: linux-2.6.11-rc4/include/linux/nfs_xdr.h
===================================================================
--- linux-2.6.11-rc4.orig/include/linux/nfs_xdr.h
+++ linux-2.6.11-rc4/include/linux/nfs_xdr.h
@@ -698,8 +698,8 @@ struct nfs_rpc_ops {
int (*rmdir) (struct inode *, struct qstr *);
int (*readdir) (struct dentry *, struct rpc_cred *,
u64, struct page *, unsigned int, int);
- int (*mknod) (struct inode *, struct qstr *, struct iattr *,
- dev_t, struct nfs_fh *, struct nfs_fattr *);
+ int (*mknod) (struct inode *, struct dentry *, struct iattr *,
+ dev_t);
int (*statfs) (struct nfs_server *, struct nfs_fh *,
struct nfs_fsstat *);
int (*fsinfo) (struct nfs_server *, struct nfs_fh *,
Index: linux-2.6.11-rc4/include/linux/nfs_fs.h
===================================================================
--- linux-2.6.11-rc4.orig/include/linux/nfs_fs.h
+++ linux-2.6.11-rc4/include/linux/nfs_fs.h
@@ -345,6 +345,8 @@ extern struct inode_operations nfs_dir_i
extern struct file_operations nfs_dir_operations;
extern struct dentry_operations nfs_dentry_operations;

+extern int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fh, struct nfs_fattr *fattr);
+
/*
* linux/fs/nfs/symlink.c
*/
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