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ace1eae84c
Linux 3.11 add O_TMPFILE to open(2), which allow creating an unlinked file on supported filesystem. It's basically doing open(2) and unlink(2) atomically. The filesystem support is added through i_op->tmpfile. We basically copy the create operation except we get rid of the link and name related stuff and add the new node to unlinked set. We also add support for linkat(2) to link tmpfile. However, since all previous file operation will skip ZIL, we force a txg_wait_synced to make sure we are sync safe. Signed-off-by: Chunwei Chen <david.chen@osnexus.com>
76 lines
2.7 KiB
C
76 lines
2.7 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright 2010 Sun Microsystems, Inc. All rights reserved.
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* Use is subject to license terms.
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*/
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#ifndef _SYS_FS_ZFS_DIR_H
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#define _SYS_FS_ZFS_DIR_H
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#include <sys/pathname.h>
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#include <sys/dmu.h>
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#include <sys/zfs_znode.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* zfs_dirent_lock() flags */
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#define ZNEW 0x0001 /* entry should not exist */
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#define ZEXISTS 0x0002 /* entry should exist */
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#define ZSHARED 0x0004 /* shared access (zfs_dirlook()) */
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#define ZXATTR 0x0008 /* we want the xattr dir */
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#define ZRENAMING 0x0010 /* znode is being renamed */
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#define ZCILOOK 0x0020 /* case-insensitive lookup requested */
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#define ZCIEXACT 0x0040 /* c-i requires c-s match (rename) */
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#define ZHAVELOCK 0x0080 /* z_name_lock is already held */
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/* mknode flags */
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#define IS_ROOT_NODE 0x01 /* create a root node */
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#define IS_XATTR 0x02 /* create an extended attribute node */
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#define IS_TMPFILE 0x04 /* create a tmpfile */
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extern int zfs_dirent_lock(zfs_dirlock_t **, znode_t *, char *, znode_t **,
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int, int *, pathname_t *);
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extern void zfs_dirent_unlock(zfs_dirlock_t *);
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extern int zfs_link_create(zfs_dirlock_t *, znode_t *, dmu_tx_t *, int);
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extern int zfs_link_destroy(zfs_dirlock_t *, znode_t *, dmu_tx_t *, int,
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boolean_t *);
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extern int zfs_dirlook(znode_t *, char *, struct inode **, int, int *,
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pathname_t *);
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extern void zfs_mknode(znode_t *, vattr_t *, dmu_tx_t *, cred_t *,
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uint_t, znode_t **, zfs_acl_ids_t *);
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extern void zfs_rmnode(znode_t *);
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extern void zfs_dl_name_switch(zfs_dirlock_t *dl, char *new, char **old);
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extern boolean_t zfs_dirempty(znode_t *);
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extern void zfs_unlinked_add(znode_t *, dmu_tx_t *);
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extern void zfs_unlinked_drain(zfs_sb_t *);
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extern int zfs_sticky_remove_access(znode_t *, znode_t *, cred_t *cr);
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extern int zfs_get_xattrdir(znode_t *, struct inode **, cred_t *, int);
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extern int zfs_make_xattrdir(znode_t *, vattr_t *, struct inode **, cred_t *);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _SYS_FS_ZFS_DIR_H */
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