forked from luck/tmp_suning_uos_patched
cf1d6c763f
This patch implements storing extended attributes both in inode or a single external block. We only store EA's in-inode when blocksize > 512 or that inode block has free space for it. When an EA's value is larger than 80 bytes, we will store the value via b-tree outside inode or block. Signed-off-by: Tiger Yang <tiger.yang@oracle.com> Signed-off-by: Mark Fasheh <mfasheh@suse.com>
95 lines
2.6 KiB
C
95 lines
2.6 KiB
C
/* -*- mode: c; c-basic-offset: 8; -*-
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* vim: noexpandtab sw=8 ts=8 sts=0:
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*
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* xattr_user.c
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*
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* Copyright (C) 2008 Oracle. All rights reserved.
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*
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* CREDITS:
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* Lots of code in this file is taken from ext3.
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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
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will 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 GNU
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* 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
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/string.h>
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#define MLOG_MASK_PREFIX ML_INODE
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#include <cluster/masklog.h>
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#include "ocfs2.h"
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#include "alloc.h"
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#include "dlmglue.h"
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#include "file.h"
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#include "ocfs2_fs.h"
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#include "xattr.h"
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#define XATTR_USER_PREFIX "user."
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static size_t ocfs2_xattr_user_list(struct inode *inode, char *list,
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size_t list_size, const char *name,
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size_t name_len)
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{
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const size_t prefix_len = sizeof(XATTR_USER_PREFIX) - 1;
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const size_t total_len = prefix_len + name_len + 1;
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struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
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if (osb->s_mount_opt & OCFS2_MOUNT_NOUSERXATTR)
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return 0;
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if (list && total_len <= list_size) {
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memcpy(list, XATTR_USER_PREFIX, prefix_len);
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memcpy(list + prefix_len, name, name_len);
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list[prefix_len + name_len] = '\0';
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}
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return total_len;
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}
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static int ocfs2_xattr_user_get(struct inode *inode, const char *name,
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void *buffer, size_t size)
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{
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struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
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if (strcmp(name, "") == 0)
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return -EINVAL;
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if (osb->s_mount_opt & OCFS2_MOUNT_NOUSERXATTR)
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return -EOPNOTSUPP;
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return ocfs2_xattr_get(inode, OCFS2_XATTR_INDEX_USER, name,
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buffer, size);
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}
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static int ocfs2_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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struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
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if (strcmp(name, "") == 0)
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return -EINVAL;
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if (osb->s_mount_opt & OCFS2_MOUNT_NOUSERXATTR)
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return -EOPNOTSUPP;
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return ocfs2_xattr_set(inode, OCFS2_XATTR_INDEX_USER, name, value,
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size, flags);
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}
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struct xattr_handler ocfs2_xattr_user_handler = {
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.prefix = XATTR_USER_PREFIX,
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.list = ocfs2_xattr_user_list,
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.get = ocfs2_xattr_user_get,
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.set = ocfs2_xattr_user_set,
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};
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