345 lines
8.0 KiB
C
345 lines
8.0 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
#include <linux/fs.h>
|
|
#include <linux/gfp.h>
|
|
#include <linux/nfs.h>
|
|
#include <linux/nfs3.h>
|
|
#include <linux/nfs_fs.h>
|
|
#include <linux/posix_acl_xattr.h>
|
|
#include <linux/nfsacl.h>
|
|
|
|
#include "internal.h"
|
|
#include "nfs3_fs.h"
|
|
|
|
#define NFSDBG_FACILITY NFSDBG_PROC
|
|
|
|
/*
|
|
* nfs3_prepare_get_acl, nfs3_complete_get_acl, nfs3_abort_get_acl: Helpers for
|
|
* caching get_acl results in a race-free way. See fs/posix_acl.c:get_acl()
|
|
* for explanations.
|
|
*/
|
|
static void nfs3_prepare_get_acl(struct posix_acl **p)
|
|
{
|
|
struct posix_acl *sentinel = uncached_acl_sentinel(current);
|
|
|
|
if (cmpxchg(p, ACL_NOT_CACHED, sentinel) != ACL_NOT_CACHED) {
|
|
/* Not the first reader or sentinel already in place. */
|
|
}
|
|
}
|
|
|
|
static void nfs3_complete_get_acl(struct posix_acl **p, struct posix_acl *acl)
|
|
{
|
|
struct posix_acl *sentinel = uncached_acl_sentinel(current);
|
|
|
|
/* Only cache the ACL if our sentinel is still in place. */
|
|
posix_acl_dup(acl);
|
|
if (cmpxchg(p, sentinel, acl) != sentinel)
|
|
posix_acl_release(acl);
|
|
}
|
|
|
|
static void nfs3_abort_get_acl(struct posix_acl **p)
|
|
{
|
|
struct posix_acl *sentinel = uncached_acl_sentinel(current);
|
|
|
|
/* Remove our sentinel upon failure. */
|
|
cmpxchg(p, sentinel, ACL_NOT_CACHED);
|
|
}
|
|
|
|
struct posix_acl *nfs3_get_acl(struct inode *inode, int type)
|
|
{
|
|
struct nfs_server *server = NFS_SERVER(inode);
|
|
struct page *pages[NFSACL_MAXPAGES] = { };
|
|
struct nfs3_getaclargs args = {
|
|
.fh = NFS_FH(inode),
|
|
/* The xdr layer may allocate pages here. */
|
|
.pages = pages,
|
|
};
|
|
struct nfs3_getaclres res = {
|
|
NULL,
|
|
};
|
|
struct rpc_message msg = {
|
|
.rpc_argp = &args,
|
|
.rpc_resp = &res,
|
|
};
|
|
int status, count;
|
|
|
|
if (!nfs_server_capable(inode, NFS_CAP_ACLS))
|
|
return ERR_PTR(-EOPNOTSUPP);
|
|
|
|
status = nfs_revalidate_inode(server, inode);
|
|
if (status < 0)
|
|
return ERR_PTR(status);
|
|
|
|
/*
|
|
* Only get the access acl when explicitly requested: We don't
|
|
* need it for access decisions, and only some applications use
|
|
* it. Applications which request the access acl first are not
|
|
* penalized from this optimization.
|
|
*/
|
|
if (type == ACL_TYPE_ACCESS)
|
|
args.mask |= NFS_ACLCNT|NFS_ACL;
|
|
if (S_ISDIR(inode->i_mode))
|
|
args.mask |= NFS_DFACLCNT|NFS_DFACL;
|
|
if (args.mask == 0)
|
|
return NULL;
|
|
|
|
dprintk("NFS call getacl\n");
|
|
msg.rpc_proc = &server->client_acl->cl_procinfo[ACLPROC3_GETACL];
|
|
res.fattr = nfs_alloc_fattr();
|
|
if (res.fattr == NULL)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
if (args.mask & NFS_ACL)
|
|
nfs3_prepare_get_acl(&inode->i_acl);
|
|
if (args.mask & NFS_DFACL)
|
|
nfs3_prepare_get_acl(&inode->i_default_acl);
|
|
|
|
status = rpc_call_sync(server->client_acl, &msg, 0);
|
|
dprintk("NFS reply getacl: %d\n", status);
|
|
|
|
/* pages may have been allocated at the xdr layer. */
|
|
for (count = 0; count < NFSACL_MAXPAGES && args.pages[count]; count++)
|
|
__free_page(args.pages[count]);
|
|
|
|
switch (status) {
|
|
case 0:
|
|
status = nfs_refresh_inode(inode, res.fattr);
|
|
break;
|
|
case -EPFNOSUPPORT:
|
|
case -EPROTONOSUPPORT:
|
|
dprintk("NFS_V3_ACL extension not supported; disabling\n");
|
|
server->caps &= ~NFS_CAP_ACLS;
|
|
/* fall through */
|
|
case -ENOTSUPP:
|
|
status = -EOPNOTSUPP;
|
|
default:
|
|
goto getout;
|
|
}
|
|
if ((args.mask & res.mask) != args.mask) {
|
|
status = -EIO;
|
|
goto getout;
|
|
}
|
|
|
|
if (res.acl_access != NULL) {
|
|
if ((posix_acl_equiv_mode(res.acl_access, NULL) == 0) ||
|
|
res.acl_access->a_count == 0) {
|
|
posix_acl_release(res.acl_access);
|
|
res.acl_access = NULL;
|
|
}
|
|
}
|
|
|
|
if (res.mask & NFS_ACL)
|
|
nfs3_complete_get_acl(&inode->i_acl, res.acl_access);
|
|
else
|
|
forget_cached_acl(inode, ACL_TYPE_ACCESS);
|
|
|
|
if (res.mask & NFS_DFACL)
|
|
nfs3_complete_get_acl(&inode->i_default_acl, res.acl_default);
|
|
else
|
|
forget_cached_acl(inode, ACL_TYPE_DEFAULT);
|
|
|
|
nfs_free_fattr(res.fattr);
|
|
if (type == ACL_TYPE_ACCESS) {
|
|
posix_acl_release(res.acl_default);
|
|
return res.acl_access;
|
|
} else {
|
|
posix_acl_release(res.acl_access);
|
|
return res.acl_default;
|
|
}
|
|
|
|
getout:
|
|
nfs3_abort_get_acl(&inode->i_acl);
|
|
nfs3_abort_get_acl(&inode->i_default_acl);
|
|
posix_acl_release(res.acl_access);
|
|
posix_acl_release(res.acl_default);
|
|
nfs_free_fattr(res.fattr);
|
|
return ERR_PTR(status);
|
|
}
|
|
|
|
static int __nfs3_proc_setacls(struct inode *inode, struct posix_acl *acl,
|
|
struct posix_acl *dfacl)
|
|
{
|
|
struct nfs_server *server = NFS_SERVER(inode);
|
|
struct nfs_fattr *fattr;
|
|
struct page *pages[NFSACL_MAXPAGES];
|
|
struct nfs3_setaclargs args = {
|
|
.inode = inode,
|
|
.mask = NFS_ACL,
|
|
.acl_access = acl,
|
|
.pages = pages,
|
|
};
|
|
struct rpc_message msg = {
|
|
.rpc_argp = &args,
|
|
.rpc_resp = &fattr,
|
|
};
|
|
int status = 0;
|
|
|
|
if (acl == NULL && (!S_ISDIR(inode->i_mode) || dfacl == NULL))
|
|
goto out;
|
|
|
|
status = -EOPNOTSUPP;
|
|
if (!nfs_server_capable(inode, NFS_CAP_ACLS))
|
|
goto out;
|
|
|
|
/* We are doing this here because XDR marshalling does not
|
|
* return any results, it BUGs. */
|
|
status = -ENOSPC;
|
|
if (acl != NULL && acl->a_count > NFS_ACL_MAX_ENTRIES)
|
|
goto out;
|
|
if (dfacl != NULL && dfacl->a_count > NFS_ACL_MAX_ENTRIES)
|
|
goto out;
|
|
if (S_ISDIR(inode->i_mode)) {
|
|
args.mask |= NFS_DFACL;
|
|
args.acl_default = dfacl;
|
|
args.len = nfsacl_size(acl, dfacl);
|
|
} else
|
|
args.len = nfsacl_size(acl, NULL);
|
|
|
|
if (args.len > NFS_ACL_INLINE_BUFSIZE) {
|
|
unsigned int npages = 1 + ((args.len - 1) >> PAGE_SHIFT);
|
|
|
|
status = -ENOMEM;
|
|
do {
|
|
args.pages[args.npages] = alloc_page(GFP_KERNEL);
|
|
if (args.pages[args.npages] == NULL)
|
|
goto out_freepages;
|
|
args.npages++;
|
|
} while (args.npages < npages);
|
|
}
|
|
|
|
dprintk("NFS call setacl\n");
|
|
status = -ENOMEM;
|
|
fattr = nfs_alloc_fattr();
|
|
if (fattr == NULL)
|
|
goto out_freepages;
|
|
|
|
msg.rpc_proc = &server->client_acl->cl_procinfo[ACLPROC3_SETACL];
|
|
msg.rpc_resp = fattr;
|
|
status = rpc_call_sync(server->client_acl, &msg, 0);
|
|
nfs_access_zap_cache(inode);
|
|
nfs_zap_acl_cache(inode);
|
|
dprintk("NFS reply setacl: %d\n", status);
|
|
|
|
switch (status) {
|
|
case 0:
|
|
status = nfs_refresh_inode(inode, fattr);
|
|
break;
|
|
case -EPFNOSUPPORT:
|
|
case -EPROTONOSUPPORT:
|
|
dprintk("NFS_V3_ACL SETACL RPC not supported"
|
|
"(will not retry)\n");
|
|
server->caps &= ~NFS_CAP_ACLS;
|
|
/* fall through */
|
|
case -ENOTSUPP:
|
|
status = -EOPNOTSUPP;
|
|
}
|
|
nfs_free_fattr(fattr);
|
|
out_freepages:
|
|
while (args.npages != 0) {
|
|
args.npages--;
|
|
__free_page(args.pages[args.npages]);
|
|
}
|
|
out:
|
|
return status;
|
|
}
|
|
|
|
int nfs3_proc_setacls(struct inode *inode, struct posix_acl *acl,
|
|
struct posix_acl *dfacl)
|
|
{
|
|
int ret;
|
|
ret = __nfs3_proc_setacls(inode, acl, dfacl);
|
|
return (ret == -EOPNOTSUPP) ? 0 : ret;
|
|
|
|
}
|
|
|
|
int nfs3_set_acl(struct inode *inode, struct posix_acl *acl, int type)
|
|
{
|
|
struct posix_acl *orig = acl, *dfacl = NULL, *alloc;
|
|
int status;
|
|
|
|
if (S_ISDIR(inode->i_mode)) {
|
|
switch(type) {
|
|
case ACL_TYPE_ACCESS:
|
|
alloc = get_acl(inode, ACL_TYPE_DEFAULT);
|
|
if (IS_ERR(alloc))
|
|
goto fail;
|
|
dfacl = alloc;
|
|
break;
|
|
|
|
case ACL_TYPE_DEFAULT:
|
|
alloc = get_acl(inode, ACL_TYPE_ACCESS);
|
|
if (IS_ERR(alloc))
|
|
goto fail;
|
|
dfacl = acl;
|
|
acl = alloc;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (acl == NULL) {
|
|
alloc = posix_acl_from_mode(inode->i_mode, GFP_KERNEL);
|
|
if (IS_ERR(alloc))
|
|
goto fail;
|
|
acl = alloc;
|
|
}
|
|
status = __nfs3_proc_setacls(inode, acl, dfacl);
|
|
out:
|
|
if (acl != orig)
|
|
posix_acl_release(acl);
|
|
if (dfacl != orig)
|
|
posix_acl_release(dfacl);
|
|
return status;
|
|
|
|
fail:
|
|
status = PTR_ERR(alloc);
|
|
goto out;
|
|
}
|
|
|
|
const struct xattr_handler *nfs3_xattr_handlers[] = {
|
|
&posix_acl_access_xattr_handler,
|
|
&posix_acl_default_xattr_handler,
|
|
NULL,
|
|
};
|
|
|
|
static int
|
|
nfs3_list_one_acl(struct inode *inode, int type, const char *name, void *data,
|
|
size_t size, ssize_t *result)
|
|
{
|
|
struct posix_acl *acl;
|
|
char *p = data + *result;
|
|
|
|
acl = get_acl(inode, type);
|
|
if (IS_ERR_OR_NULL(acl))
|
|
return 0;
|
|
|
|
posix_acl_release(acl);
|
|
|
|
*result += strlen(name);
|
|
*result += 1;
|
|
if (!size)
|
|
return 0;
|
|
if (*result > size)
|
|
return -ERANGE;
|
|
|
|
strcpy(p, name);
|
|
return 0;
|
|
}
|
|
|
|
ssize_t
|
|
nfs3_listxattr(struct dentry *dentry, char *data, size_t size)
|
|
{
|
|
struct inode *inode = d_inode(dentry);
|
|
ssize_t result = 0;
|
|
int error;
|
|
|
|
error = nfs3_list_one_acl(inode, ACL_TYPE_ACCESS,
|
|
XATTR_NAME_POSIX_ACL_ACCESS, data, size, &result);
|
|
if (error)
|
|
return error;
|
|
|
|
error = nfs3_list_one_acl(inode, ACL_TYPE_DEFAULT,
|
|
XATTR_NAME_POSIX_ACL_DEFAULT, data, size, &result);
|
|
if (error)
|
|
return error;
|
|
return result;
|
|
}
|