[XFS] Use the generic xattr methods.
Add missing file fs/xfs/linux-2.6/xfs_xattr.c SGI-PV: 982343 SGI-Modid: xfs-linux-melb:xfs-kern:31234a Signed-off-by: Christoph Hellwig <hch@infradead.org> Signed-off-by: Tim Shimmin <tes@sgi.com> Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>
This commit is contained in:
Lachlan McIlroy
Niv Sardi
parent
ddea2d5246
commit
f9e09f095f
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/*
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* Copyright (C) 2008 Christoph Hellwig.
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* Portions Copyright (C) 2000-2008 Silicon Graphics, Inc.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it would be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "xfs.h"
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#include "xfs_da_btree.h"
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#include "xfs_bmap_btree.h"
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#include "xfs_inode.h"
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#include "xfs_attr.h"
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#include "xfs_attr_leaf.h"
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#include "xfs_acl.h"
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#include "xfs_vnodeops.h"
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#include <linux/posix_acl_xattr.h>
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#include <linux/xattr.h>
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/*
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* ACL handling. Should eventually be moved into xfs_acl.c
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*/
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static int
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xfs_decode_acl(const char *name)
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{
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if (strcmp(name, "posix_acl_access") == 0)
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return _ACL_TYPE_ACCESS;
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else if (strcmp(name, "posix_acl_default") == 0)
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return _ACL_TYPE_DEFAULT;
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return -EINVAL;
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}
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/*
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* Get system extended attributes which at the moment only
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* includes Posix ACLs.
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*/
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static int
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xfs_xattr_system_get(struct inode *inode, const char *name,
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void *buffer, size_t size)
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{
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int acl;
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acl = xfs_decode_acl(name);
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if (acl < 0)
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return acl;
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return xfs_acl_vget(inode, buffer, size, acl);
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}
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static int
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xfs_xattr_system_set(struct inode *inode, const char *name,
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const void *value, size_t size, int flags)
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{
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int error, acl;
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acl = xfs_decode_acl(name);
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if (acl < 0)
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return acl;
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if (flags & XATTR_CREATE)
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return -EINVAL;
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if (!value)
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return xfs_acl_vremove(inode, acl);
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error = xfs_acl_vset(inode, (void *)value, size, acl);
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if (!error)
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vn_revalidate(inode);
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return error;
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}
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static struct xattr_handler xfs_xattr_system_handler = {
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.prefix = XATTR_SYSTEM_PREFIX,
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.get = xfs_xattr_system_get,
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.set = xfs_xattr_system_set,
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};
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/*
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* Real xattr handling. The only difference between the namespaces is
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* a flag passed to the low-level attr code.
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*/
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static int
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__xfs_xattr_get(struct inode *inode, const char *name,
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void *value, size_t size, int xflags)
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{
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struct xfs_inode *ip = XFS_I(inode);
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int error, asize = size;
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if (strcmp(name, "") == 0)
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return -EINVAL;
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/* Convert Linux syscall to XFS internal ATTR flags */
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if (!size) {
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xflags |= ATTR_KERNOVAL;
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value = NULL;
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}
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error = -xfs_attr_get(ip, name, value, &asize, xflags);
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if (error)
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return error;
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return asize;
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}
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static int
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__xfs_xattr_set(struct inode *inode, const char *name, const void *value,
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size_t size, int flags, int xflags)
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{
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struct xfs_inode *ip = XFS_I(inode);
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if (strcmp(name, "") == 0)
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return -EINVAL;
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/* Convert Linux syscall to XFS internal ATTR flags */
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if (flags & XATTR_CREATE)
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xflags |= ATTR_CREATE;
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if (flags & XATTR_REPLACE)
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xflags |= ATTR_REPLACE;
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if (!value)
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return -xfs_attr_remove(ip, name, xflags);
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return -xfs_attr_set(ip, name, (void *)value, size, xflags);
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}
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static int
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xfs_xattr_user_get(struct inode *inode, const char *name,
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void *value, size_t size)
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{
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return __xfs_xattr_get(inode, name, value, size, 0);
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}
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static int
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xfs_xattr_user_set(struct inode *inode, const char *name,
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const void *value, size_t size, int flags)
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{
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return __xfs_xattr_set(inode, name, value, size, flags, 0);
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}
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static struct xattr_handler xfs_xattr_user_handler = {
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.prefix = XATTR_USER_PREFIX,
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.get = xfs_xattr_user_get,
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.set = xfs_xattr_user_set,
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};
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static int
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xfs_xattr_trusted_get(struct inode *inode, const char *name,
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void *value, size_t size)
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{
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return __xfs_xattr_get(inode, name, value, size, ATTR_ROOT);
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}
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static int
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xfs_xattr_trusted_set(struct inode *inode, const char *name,
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const void *value, size_t size, int flags)
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{
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return __xfs_xattr_set(inode, name, value, size, flags, ATTR_ROOT);
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}
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static struct xattr_handler xfs_xattr_trusted_handler = {
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.prefix = XATTR_TRUSTED_PREFIX,
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.get = xfs_xattr_trusted_get,
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.set = xfs_xattr_trusted_set,
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};
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static int
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xfs_xattr_secure_get(struct inode *inode, const char *name,
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void *value, size_t size)
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{
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return __xfs_xattr_get(inode, name, value, size, ATTR_SECURE);
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}
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static int
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xfs_xattr_secure_set(struct inode *inode, const char *name,
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const void *value, size_t size, int flags)
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{
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return __xfs_xattr_set(inode, name, value, size, flags, ATTR_SECURE);
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}
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static struct xattr_handler xfs_xattr_security_handler = {
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.prefix = XATTR_SECURITY_PREFIX,
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.get = xfs_xattr_secure_get,
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.set = xfs_xattr_secure_set,
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};
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struct xattr_handler *xfs_xattr_handlers[] = {
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&xfs_xattr_user_handler,
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&xfs_xattr_trusted_handler,
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&xfs_xattr_security_handler,
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&xfs_xattr_system_handler,
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NULL
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};
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static unsigned int xfs_xattr_prefix_len(int flags)
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{
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if (flags & XFS_ATTR_SECURE)
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return sizeof("security");
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else if (flags & XFS_ATTR_ROOT)
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return sizeof("trusted");
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else
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return sizeof("user");
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}
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static const char *xfs_xattr_prefix(int flags)
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{
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if (flags & XFS_ATTR_SECURE)
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return xfs_xattr_security_handler.prefix;
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else if (flags & XFS_ATTR_ROOT)
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return xfs_xattr_trusted_handler.prefix;
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else
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return xfs_xattr_user_handler.prefix;
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}
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static int
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xfs_xattr_put_listent(struct xfs_attr_list_context *context, int flags,
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char *name, int namelen, int valuelen, char *value)
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{
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unsigned int prefix_len = xfs_xattr_prefix_len(flags);
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char *offset;
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int arraytop;
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ASSERT(context->count >= 0);
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/*
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* Only show root namespace entries if we are actually allowed to
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* see them.
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*/
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if ((flags & XFS_ATTR_ROOT) && !capable(CAP_SYS_ADMIN))
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return 0;
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arraytop = context->count + prefix_len + namelen + 1;
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if (arraytop > context->firstu) {
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context->count = -1; /* insufficient space */
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return 1;
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}
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offset = (char *)context->alist + context->count;
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strncpy(offset, xfs_xattr_prefix(flags), prefix_len);
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offset += prefix_len;
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strncpy(offset, name, namelen); /* real name */
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offset += namelen;
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*offset = '\0';
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context->count += prefix_len + namelen + 1;
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return 0;
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}
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static int
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xfs_xattr_put_listent_sizes(struct xfs_attr_list_context *context, int flags,
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char *name, int namelen, int valuelen, char *value)
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{
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context->count += xfs_xattr_prefix_len(flags) + namelen + 1;
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return 0;
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}
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static int
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list_one_attr(const char *name, const size_t len, void *data,
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size_t size, ssize_t *result)
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{
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char *p = data + *result;
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*result += len;
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if (!size)
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return 0;
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if (*result > size)
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return -ERANGE;
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strcpy(p, name);
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return 0;
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}
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ssize_t
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xfs_vn_listxattr(struct dentry *dentry, char *data, size_t size)
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{
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struct xfs_attr_list_context context;
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struct attrlist_cursor_kern cursor = { 0 };
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struct inode *inode = dentry->d_inode;
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int error;
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/*
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* First read the regular on-disk attributes.
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*/
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memset(&context, 0, sizeof(context));
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context.dp = XFS_I(inode);
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context.cursor = &cursor;
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context.resynch = 1;
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context.alist = data;
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context.bufsize = size;
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context.firstu = context.bufsize;
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if (size)
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context.put_listent = xfs_xattr_put_listent;
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else
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context.put_listent = xfs_xattr_put_listent_sizes;
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xfs_attr_list_int(&context);
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if (context.count < 0)
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return -ERANGE;
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/*
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* Then add the two synthetic ACL attributes.
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*/
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if (xfs_acl_vhasacl_access(inode)) {
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error = list_one_attr(POSIX_ACL_XATTR_ACCESS,
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strlen(POSIX_ACL_XATTR_ACCESS) + 1,
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data, size, &context.count);
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if (error)
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return error;
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}
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if (xfs_acl_vhasacl_default(inode)) {
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error = list_one_attr(POSIX_ACL_XATTR_DEFAULT,
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strlen(POSIX_ACL_XATTR_DEFAULT) + 1,
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data, size, &context.count);
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if (error)
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return error;
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}
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return context.count;
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}
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