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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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2401dc2975
Also don't bother to set up a .get_acl method for symlinks as we do not support access control (ACLs or even mode bits) for symlinks in Linux, and create inodes with the proper mode instead of fixing it up later. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Dave Chinner <dchinner@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
246 lines
5.7 KiB
C
246 lines
5.7 KiB
C
/*
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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_format.h"
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#include "xfs_log_format.h"
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#include "xfs_trans_resv.h"
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#include "xfs_sb.h"
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#include "xfs_ag.h"
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#include "xfs_mount.h"
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#include "xfs_da_format.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 <linux/posix_acl_xattr.h>
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#include <linux/xattr.h>
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static int
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xfs_xattr_get(struct dentry *dentry, 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(dentry->d_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, (unsigned char *)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 dentry *dentry, 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(dentry->d_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, (unsigned char *)name, xflags);
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return -xfs_attr_set(ip, (unsigned char *)name,
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(void *)value, size, xflags);
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}
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static const struct xattr_handler xfs_xattr_user_handler = {
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.prefix = XATTR_USER_PREFIX,
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.flags = 0, /* no flags implies user namespace */
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.get = xfs_xattr_get,
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.set = xfs_xattr_set,
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};
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static const struct xattr_handler xfs_xattr_trusted_handler = {
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.prefix = XATTR_TRUSTED_PREFIX,
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.flags = ATTR_ROOT,
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.get = xfs_xattr_get,
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.set = xfs_xattr_set,
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};
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static const struct xattr_handler xfs_xattr_security_handler = {
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.prefix = XATTR_SECURITY_PREFIX,
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.flags = ATTR_SECURE,
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.get = xfs_xattr_get,
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.set = xfs_xattr_set,
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};
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const 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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#ifdef CONFIG_XFS_POSIX_ACL
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&posix_acl_access_xattr_handler,
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&posix_acl_default_xattr_handler,
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#endif
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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(
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struct xfs_attr_list_context *context,
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int flags,
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unsigned char *name,
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int namelen,
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int valuelen,
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unsigned 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, (char *)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(
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struct xfs_attr_list_context *context,
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int flags,
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unsigned char *name,
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int namelen,
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int valuelen,
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unsigned 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 (posix_acl_access_exists(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 (posix_acl_default_exists(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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