646 lines
15 KiB
C
646 lines
15 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 (C) 2011 Lawrence Livermore National Security, LLC.
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* Copyright (C) 2015 Jörg Thalheim.
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*/
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#ifndef _ZFS_VFS_H
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#define _ZFS_VFS_H
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#include <sys/taskq.h>
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#include <sys/cred.h>
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#include <linux/backing-dev.h>
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#include <linux/compat.h>
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/*
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* 2.6.28 API change,
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* Added insert_inode_locked() helper function, prior to this most callers
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* used insert_inode_hash(). The older method doesn't check for collisions
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* in the inode_hashtable but it still acceptable for use.
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*/
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#ifndef HAVE_INSERT_INODE_LOCKED
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static inline int
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insert_inode_locked(struct inode *ip)
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{
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insert_inode_hash(ip);
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return (0);
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}
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#endif /* HAVE_INSERT_INODE_LOCKED */
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/*
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* 2.6.35 API change,
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* Add truncate_setsize() if it is not exported by the Linux kernel.
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*
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* Truncate the inode and pages associated with the inode. The pages are
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* unmapped and removed from cache.
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*/
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#ifndef HAVE_TRUNCATE_SETSIZE
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static inline void
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truncate_setsize(struct inode *ip, loff_t new)
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{
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struct address_space *mapping = ip->i_mapping;
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i_size_write(ip, new);
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unmap_mapping_range(mapping, new + PAGE_SIZE - 1, 0, 1);
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truncate_inode_pages(mapping, new);
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unmap_mapping_range(mapping, new + PAGE_SIZE - 1, 0, 1);
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}
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#endif /* HAVE_TRUNCATE_SETSIZE */
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/*
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* 2.6.32 - 2.6.33, bdi_setup_and_register() is not available.
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* 2.6.34 - 3.19, bdi_setup_and_register() takes 3 arguments.
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* 4.0 - 4.11, bdi_setup_and_register() takes 2 arguments.
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* 4.12 - x.y, super_setup_bdi_name() new interface.
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*/
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#if defined(HAVE_SUPER_SETUP_BDI_NAME)
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extern atomic_long_t zfs_bdi_seq;
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static inline int
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zpl_bdi_setup(struct super_block *sb, char *name)
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{
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return super_setup_bdi_name(sb, "%.28s-%ld", name,
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atomic_long_inc_return(&zfs_bdi_seq));
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}
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static inline void
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zpl_bdi_destroy(struct super_block *sb)
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{
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}
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#elif defined(HAVE_2ARGS_BDI_SETUP_AND_REGISTER)
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static inline int
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zpl_bdi_setup(struct super_block *sb, char *name)
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{
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struct backing_dev_info *bdi;
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int error;
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bdi = kmem_zalloc(sizeof (struct backing_dev_info), KM_SLEEP);
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error = bdi_setup_and_register(bdi, name);
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if (error) {
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kmem_free(bdi, sizeof (struct backing_dev_info));
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return (error);
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}
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sb->s_bdi = bdi;
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return (0);
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}
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static inline void
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zpl_bdi_destroy(struct super_block *sb)
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{
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struct backing_dev_info *bdi = sb->s_bdi;
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bdi_destroy(bdi);
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kmem_free(bdi, sizeof (struct backing_dev_info));
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sb->s_bdi = NULL;
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}
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#elif defined(HAVE_3ARGS_BDI_SETUP_AND_REGISTER)
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static inline int
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zpl_bdi_setup(struct super_block *sb, char *name)
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{
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struct backing_dev_info *bdi;
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int error;
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bdi = kmem_zalloc(sizeof (struct backing_dev_info), KM_SLEEP);
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error = bdi_setup_and_register(bdi, name, BDI_CAP_MAP_COPY);
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if (error) {
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kmem_free(sb->s_bdi, sizeof (struct backing_dev_info));
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return (error);
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}
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sb->s_bdi = bdi;
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return (0);
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}
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static inline void
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zpl_bdi_destroy(struct super_block *sb)
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{
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struct backing_dev_info *bdi = sb->s_bdi;
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bdi_destroy(bdi);
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kmem_free(bdi, sizeof (struct backing_dev_info));
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sb->s_bdi = NULL;
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}
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#else
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extern atomic_long_t zfs_bdi_seq;
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static inline int
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zpl_bdi_setup(struct super_block *sb, char *name)
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{
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struct backing_dev_info *bdi;
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int error;
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bdi = kmem_zalloc(sizeof (struct backing_dev_info), KM_SLEEP);
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bdi->name = name;
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bdi->capabilities = BDI_CAP_MAP_COPY;
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error = bdi_init(bdi);
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if (error) {
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kmem_free(bdi, sizeof (struct backing_dev_info));
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return (error);
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}
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error = bdi_register(bdi, NULL, "%.28s-%ld", name,
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atomic_long_inc_return(&zfs_bdi_seq));
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if (error) {
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bdi_destroy(bdi);
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kmem_free(bdi, sizeof (struct backing_dev_info));
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return (error);
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}
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sb->s_bdi = bdi;
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return (0);
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}
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static inline void
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zpl_bdi_destroy(struct super_block *sb)
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{
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struct backing_dev_info *bdi = sb->s_bdi;
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bdi_destroy(bdi);
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kmem_free(bdi, sizeof (struct backing_dev_info));
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sb->s_bdi = NULL;
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}
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#endif
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/*
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* 4.14 adds SB_* flag definitions, define them to MS_* equivalents
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* if not set.
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*/
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#ifndef SB_RDONLY
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#define SB_RDONLY MS_RDONLY
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#endif
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#ifndef SB_SILENT
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#define SB_SILENT MS_SILENT
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#endif
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#ifndef SB_ACTIVE
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#define SB_ACTIVE MS_ACTIVE
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#endif
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#ifndef SB_POSIXACL
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#define SB_POSIXACL MS_POSIXACL
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#endif
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#ifndef SB_MANDLOCK
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#define SB_MANDLOCK MS_MANDLOCK
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#endif
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#ifndef SB_NOATIME
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#define SB_NOATIME MS_NOATIME
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#endif
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/*
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* 2.6.38 API change,
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* LOOKUP_RCU flag introduced to distinguish rcu-walk from ref-walk cases.
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*/
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#ifndef LOOKUP_RCU
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#define LOOKUP_RCU 0x0
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#endif /* LOOKUP_RCU */
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/*
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* 3.2-rc1 API change,
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* Add set_nlink() if it is not exported by the Linux kernel.
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*
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* i_nlink is read-only in Linux 3.2, but it can be set directly in
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* earlier kernels.
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*/
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#ifndef HAVE_SET_NLINK
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static inline void
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set_nlink(struct inode *inode, unsigned int nlink)
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{
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inode->i_nlink = nlink;
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}
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#endif /* HAVE_SET_NLINK */
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/*
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* 3.3 API change,
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* The VFS .create, .mkdir and .mknod callbacks were updated to take a
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* umode_t type rather than an int. To cleanly handle both definitions
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* the zpl_umode_t type is introduced and set accordingly.
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*/
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#ifdef HAVE_MKDIR_UMODE_T
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typedef umode_t zpl_umode_t;
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#else
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typedef int zpl_umode_t;
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#endif
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/*
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* 3.5 API change,
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* The clear_inode() function replaces end_writeback() and introduces an
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* ordering change regarding when the inode_sync_wait() occurs. See the
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* configure check in config/kernel-clear-inode.m4 for full details.
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*/
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#if defined(HAVE_EVICT_INODE) && !defined(HAVE_CLEAR_INODE)
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#define clear_inode(ip) end_writeback(ip)
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#endif /* HAVE_EVICT_INODE && !HAVE_CLEAR_INODE */
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/*
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* 3.6 API change,
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* The sget() helper function now takes the mount flags as an argument.
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*/
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#ifdef HAVE_5ARG_SGET
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#define zpl_sget(type, cmp, set, fl, mtd) sget(type, cmp, set, fl, mtd)
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#else
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#define zpl_sget(type, cmp, set, fl, mtd) sget(type, cmp, set, mtd)
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#endif /* HAVE_5ARG_SGET */
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#if defined(SEEK_HOLE) && defined(SEEK_DATA) && !defined(HAVE_LSEEK_EXECUTE)
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static inline loff_t
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lseek_execute(
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struct file *filp,
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struct inode *inode,
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loff_t offset,
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loff_t maxsize)
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{
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if (offset < 0 && !(filp->f_mode & FMODE_UNSIGNED_OFFSET))
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return (-EINVAL);
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if (offset > maxsize)
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return (-EINVAL);
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if (offset != filp->f_pos) {
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spin_lock(&filp->f_lock);
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filp->f_pos = offset;
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filp->f_version = 0;
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spin_unlock(&filp->f_lock);
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}
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return (offset);
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}
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#endif /* SEEK_HOLE && SEEK_DATA && !HAVE_LSEEK_EXECUTE */
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#if defined(CONFIG_FS_POSIX_ACL)
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/*
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* These functions safely approximates the behavior of posix_acl_release()
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* which cannot be used because it calls the GPL-only symbol kfree_rcu().
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* The in-kernel version, which can access the RCU, frees the ACLs after
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* the grace period expires. Because we're unsure how long that grace
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* period may be this implementation conservatively delays for 60 seconds.
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* This is several orders of magnitude larger than expected grace period.
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* At 60 seconds the kernel will also begin issuing RCU stall warnings.
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*/
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#include <linux/posix_acl.h>
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#if defined(HAVE_POSIX_ACL_RELEASE) && !defined(HAVE_POSIX_ACL_RELEASE_GPL_ONLY)
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#define zpl_posix_acl_release(arg) posix_acl_release(arg)
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#else
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void zpl_posix_acl_release_impl(struct posix_acl *);
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static inline void
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zpl_posix_acl_release(struct posix_acl *acl)
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{
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if ((acl == NULL) || (acl == ACL_NOT_CACHED))
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return;
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#ifdef HAVE_ACL_REFCOUNT
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if (refcount_dec_and_test(&acl->a_refcount))
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zpl_posix_acl_release_impl(acl);
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#else
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if (atomic_dec_and_test(&acl->a_refcount))
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zpl_posix_acl_release_impl(acl);
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#endif
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}
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#endif /* HAVE_POSIX_ACL_RELEASE */
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#ifdef HAVE_SET_CACHED_ACL_USABLE
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#define zpl_set_cached_acl(ip, ty, n) set_cached_acl(ip, ty, n)
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#define zpl_forget_cached_acl(ip, ty) forget_cached_acl(ip, ty)
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#else
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static inline void
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zpl_set_cached_acl(struct inode *ip, int type, struct posix_acl *newer)
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{
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struct posix_acl *older = NULL;
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spin_lock(&ip->i_lock);
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if ((newer != ACL_NOT_CACHED) && (newer != NULL))
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posix_acl_dup(newer);
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switch (type) {
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case ACL_TYPE_ACCESS:
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older = ip->i_acl;
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rcu_assign_pointer(ip->i_acl, newer);
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break;
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case ACL_TYPE_DEFAULT:
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older = ip->i_default_acl;
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rcu_assign_pointer(ip->i_default_acl, newer);
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break;
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}
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spin_unlock(&ip->i_lock);
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zpl_posix_acl_release(older);
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}
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static inline void
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zpl_forget_cached_acl(struct inode *ip, int type)
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{
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zpl_set_cached_acl(ip, type, (struct posix_acl *)ACL_NOT_CACHED);
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}
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#endif /* HAVE_SET_CACHED_ACL_USABLE */
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#ifndef HAVE___POSIX_ACL_CHMOD
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#ifdef HAVE_POSIX_ACL_CHMOD
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#define __posix_acl_chmod(acl, gfp, mode) posix_acl_chmod(acl, gfp, mode)
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#define __posix_acl_create(acl, gfp, mode) posix_acl_create(acl, gfp, mode)
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#else
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static inline int
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__posix_acl_chmod(struct posix_acl **acl, int flags, umode_t umode)
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{
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struct posix_acl *oldacl = *acl;
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mode_t mode = umode;
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int error;
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*acl = posix_acl_clone(*acl, flags);
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zpl_posix_acl_release(oldacl);
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if (!(*acl))
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return (-ENOMEM);
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error = posix_acl_chmod_masq(*acl, mode);
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if (error) {
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zpl_posix_acl_release(*acl);
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*acl = NULL;
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}
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return (error);
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}
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static inline int
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__posix_acl_create(struct posix_acl **acl, int flags, umode_t *umodep)
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{
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struct posix_acl *oldacl = *acl;
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mode_t mode = *umodep;
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int error;
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*acl = posix_acl_clone(*acl, flags);
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zpl_posix_acl_release(oldacl);
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if (!(*acl))
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return (-ENOMEM);
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error = posix_acl_create_masq(*acl, &mode);
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*umodep = mode;
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if (error < 0) {
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zpl_posix_acl_release(*acl);
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*acl = NULL;
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}
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return (error);
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}
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#endif /* HAVE_POSIX_ACL_CHMOD */
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#endif /* HAVE___POSIX_ACL_CHMOD */
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#ifdef HAVE_POSIX_ACL_EQUIV_MODE_UMODE_T
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typedef umode_t zpl_equivmode_t;
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#else
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typedef mode_t zpl_equivmode_t;
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#endif /* HAVE_POSIX_ACL_EQUIV_MODE_UMODE_T */
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/*
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* 4.8 API change,
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* posix_acl_valid() now must be passed a namespace, the namespace from
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* from super block associated with the given inode is used for this purpose.
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*/
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#ifdef HAVE_POSIX_ACL_VALID_WITH_NS
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#define zpl_posix_acl_valid(ip, acl) posix_acl_valid(ip->i_sb->s_user_ns, acl)
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#else
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#define zpl_posix_acl_valid(ip, acl) posix_acl_valid(acl)
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#endif
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#endif /* CONFIG_FS_POSIX_ACL */
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/*
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* 2.6.38 API change,
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* The is_owner_or_cap() function was renamed to inode_owner_or_capable().
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*/
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#ifdef HAVE_INODE_OWNER_OR_CAPABLE
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#define zpl_inode_owner_or_capable(ip) inode_owner_or_capable(ip)
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#else
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#define zpl_inode_owner_or_capable(ip) is_owner_or_cap(ip)
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#endif /* HAVE_INODE_OWNER_OR_CAPABLE */
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/*
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* 3.19 API change
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* struct access f->f_dentry->d_inode was replaced by accessor function
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* file_inode(f)
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*/
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#ifndef HAVE_FILE_INODE
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static inline struct inode *file_inode(const struct file *f)
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{
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return (f->f_dentry->d_inode);
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}
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#endif /* HAVE_FILE_INODE */
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/*
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* 4.1 API change
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* struct access file->f_path.dentry was replaced by accessor function
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* file_dentry(f)
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*/
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#ifndef HAVE_FILE_DENTRY
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static inline struct dentry *file_dentry(const struct file *f)
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{
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return (f->f_path.dentry);
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}
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#endif /* HAVE_FILE_DENTRY */
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#ifdef HAVE_KUID_HELPERS
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static inline uid_t zfs_uid_read_impl(struct inode *ip)
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{
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#ifdef HAVE_SUPER_USER_NS
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return (from_kuid(ip->i_sb->s_user_ns, ip->i_uid));
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#else
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return (from_kuid(kcred->user_ns, ip->i_uid));
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#endif
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}
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static inline uid_t zfs_uid_read(struct inode *ip)
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{
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return (zfs_uid_read_impl(ip));
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}
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static inline gid_t zfs_gid_read_impl(struct inode *ip)
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{
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#ifdef HAVE_SUPER_USER_NS
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return (from_kgid(ip->i_sb->s_user_ns, ip->i_gid));
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#else
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return (from_kgid(kcred->user_ns, ip->i_gid));
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#endif
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}
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static inline gid_t zfs_gid_read(struct inode *ip)
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{
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return (zfs_gid_read_impl(ip));
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}
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static inline void zfs_uid_write(struct inode *ip, uid_t uid)
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{
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#ifdef HAVE_SUPER_USER_NS
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ip->i_uid = make_kuid(ip->i_sb->s_user_ns, uid);
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#else
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ip->i_uid = make_kuid(kcred->user_ns, uid);
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#endif
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}
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static inline void zfs_gid_write(struct inode *ip, gid_t gid)
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{
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#ifdef HAVE_SUPER_USER_NS
|
|
ip->i_gid = make_kgid(ip->i_sb->s_user_ns, gid);
|
|
#else
|
|
ip->i_gid = make_kgid(kcred->user_ns, gid);
|
|
#endif
|
|
}
|
|
|
|
#else
|
|
static inline uid_t zfs_uid_read(struct inode *ip)
|
|
{
|
|
return (ip->i_uid);
|
|
}
|
|
|
|
static inline gid_t zfs_gid_read(struct inode *ip)
|
|
{
|
|
return (ip->i_gid);
|
|
}
|
|
|
|
static inline void zfs_uid_write(struct inode *ip, uid_t uid)
|
|
{
|
|
ip->i_uid = uid;
|
|
}
|
|
|
|
static inline void zfs_gid_write(struct inode *ip, gid_t gid)
|
|
{
|
|
ip->i_gid = gid;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* 2.6.38 API change
|
|
*/
|
|
#ifdef HAVE_FOLLOW_DOWN_ONE
|
|
#define zpl_follow_down_one(path) follow_down_one(path)
|
|
#define zpl_follow_up(path) follow_up(path)
|
|
#else
|
|
#define zpl_follow_down_one(path) follow_down(path)
|
|
#define zpl_follow_up(path) follow_up(path)
|
|
#endif
|
|
|
|
/*
|
|
* 4.9 API change
|
|
*/
|
|
#ifndef HAVE_SETATTR_PREPARE
|
|
static inline int
|
|
setattr_prepare(struct dentry *dentry, struct iattr *ia)
|
|
{
|
|
return (inode_change_ok(dentry->d_inode, ia));
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* 4.11 API change
|
|
* These macros are defined by kernel 4.11. We define them so that the same
|
|
* code builds under kernels < 4.11 and >= 4.11. The macros are set to 0 so
|
|
* that it will create obvious failures if they are accidentally used when built
|
|
* against a kernel >= 4.11.
|
|
*/
|
|
|
|
#ifndef STATX_BASIC_STATS
|
|
#define STATX_BASIC_STATS 0
|
|
#endif
|
|
|
|
#ifndef AT_STATX_SYNC_AS_STAT
|
|
#define AT_STATX_SYNC_AS_STAT 0
|
|
#endif
|
|
|
|
/*
|
|
* 4.11 API change
|
|
* 4.11 takes struct path *, < 4.11 takes vfsmount *
|
|
*/
|
|
|
|
#ifdef HAVE_VFSMOUNT_IOPS_GETATTR
|
|
#define ZPL_GETATTR_WRAPPER(func) \
|
|
static int \
|
|
func(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) \
|
|
{ \
|
|
struct path path = { .mnt = mnt, .dentry = dentry }; \
|
|
return func##_impl(&path, stat, STATX_BASIC_STATS, \
|
|
AT_STATX_SYNC_AS_STAT); \
|
|
}
|
|
#elif defined(HAVE_PATH_IOPS_GETATTR)
|
|
#define ZPL_GETATTR_WRAPPER(func) \
|
|
static int \
|
|
func(const struct path *path, struct kstat *stat, u32 request_mask, \
|
|
unsigned int query_flags) \
|
|
{ \
|
|
return (func##_impl(path, stat, request_mask, query_flags)); \
|
|
}
|
|
#else
|
|
#error
|
|
#endif
|
|
|
|
/*
|
|
* 4.9 API change
|
|
* Preferred interface to get the current FS time.
|
|
*/
|
|
#if !defined(HAVE_CURRENT_TIME)
|
|
static inline struct timespec
|
|
current_time(struct inode *ip)
|
|
{
|
|
return (timespec_trunc(current_kernel_time(), ip->i_sb->s_time_gran));
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* 4.16 API change
|
|
* Added iversion interface for managing inode version field.
|
|
*/
|
|
#ifdef HAVE_INODE_SET_IVERSION
|
|
#include <linux/iversion.h>
|
|
#else
|
|
static inline void
|
|
inode_set_iversion(struct inode *ip, u64 val)
|
|
{
|
|
ip->i_version = val;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Returns true when called in the context of a 32-bit system call.
|
|
*/
|
|
static inline int
|
|
zpl_is_32bit_api(void)
|
|
{
|
|
#ifdef CONFIG_COMPAT
|
|
#ifdef HAVE_IN_COMPAT_SYSCALL
|
|
return (in_compat_syscall());
|
|
#else
|
|
return (is_compat_task());
|
|
#endif
|
|
#else
|
|
return (BITS_PER_LONG == 32);
|
|
#endif
|
|
}
|
|
|
|
#endif /* _ZFS_VFS_H */
|