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066e825221
Increase the minimum supported kernel version from 2.6.32 to 3.10.
This removes support for the following Linux enterprise distributions.
Distribution | Kernel | End of Life
---------------- | ------ | -------------
Ubuntu 12.04 LTS | 3.2 | Apr 28, 2017
SLES 11 | 3.0 | Mar 32, 2019
RHEL / CentOS 6 | 2.6.32 | Nov 30, 2020
The following changes were made as part of removing support.
* Updated `configure` to enforce a minimum kernel version as
specified in the META file (Linux-Minimum: 3.10).
configure: error:
*** Cannot build against kernel version 2.6.32.
*** The minimum supported kernel version is 3.10.
* Removed all `configure` kABI checks and matching C code for
interfaces which solely predate the Linux 3.10 kernel.
* Updated all `configure` kABI checks to fail when an interface is
missing which was in the 3.10 kernel up to the latest 5.1 kernel.
Removed the HAVE_* preprocessor defines for these checks and
updated the code to unconditionally use the verified interface.
* Inverted the detection logic in several kABI checks to match
the new interface as it appears in 3.10 and newer and not the
legacy interface.
* Consolidated the following checks in to individual files. Due
the large number of changes in the checks it made sense to handle
this now. It would be desirable to group other related checks in
the same fashion, but this as left as future work.
- config/kernel-blkdev.m4 - Block device kABI checks
- config/kernel-blk-queue.m4 - Block queue kABI checks
- config/kernel-bio.m4 - Bio interface kABI checks
* Removed the kABI checks for sops->nr_cached_objects() and
sops->free_cached_objects(). These interfaces are currently unused.
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #9566
440 lines
10 KiB
C
440 lines
10 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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* 2.6.34 - 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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#error "Unsupported kernel"
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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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* 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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#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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/*
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* 3.1 API change,
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* posix_acl_chmod() was added as the preferred interface.
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*
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* 3.14 API change,
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* posix_acl_chmod() was changed to __posix_acl_chmod()
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*/
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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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#error "Unsupported kernel"
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#endif /* HAVE_POSIX_ACL_CHMOD */
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#endif /* HAVE___POSIX_ACL_CHMOD */
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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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* 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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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
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ip->i_gid = make_kgid(ip->i_sb->s_user_ns, gid);
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#else
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ip->i_gid = make_kgid(kcred->user_ns, gid);
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#endif
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}
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/*
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* 4.9 API change
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*/
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#ifndef HAVE_SETATTR_PREPARE
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static inline int
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setattr_prepare(struct dentry *dentry, struct iattr *ia)
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{
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return (inode_change_ok(dentry->d_inode, ia));
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}
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#endif
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/*
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* 4.11 API change
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* These macros are defined by kernel 4.11. We define them so that the same
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* code builds under kernels < 4.11 and >= 4.11. The macros are set to 0 so
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* that it will create obvious failures if they are accidentally used when built
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* against a kernel >= 4.11.
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*/
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#ifndef STATX_BASIC_STATS
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#define STATX_BASIC_STATS 0
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#endif
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#ifndef AT_STATX_SYNC_AS_STAT
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#define AT_STATX_SYNC_AS_STAT 0
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#endif
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/*
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* 4.11 API change
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* 4.11 takes struct path *, < 4.11 takes vfsmount *
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*/
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#ifdef HAVE_VFSMOUNT_IOPS_GETATTR
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#define ZPL_GETATTR_WRAPPER(func) \
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static int \
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func(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) \
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{ \
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struct path path = { .mnt = mnt, .dentry = dentry }; \
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return func##_impl(&path, stat, STATX_BASIC_STATS, \
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AT_STATX_SYNC_AS_STAT); \
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}
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#elif defined(HAVE_PATH_IOPS_GETATTR)
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#define ZPL_GETATTR_WRAPPER(func) \
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static int \
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func(const struct path *path, struct kstat *stat, u32 request_mask, \
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unsigned int query_flags) \
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{ \
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return (func##_impl(path, stat, request_mask, query_flags)); \
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}
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#else
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#error
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#endif
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/*
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* 4.9 API change
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* Preferred interface to get the current FS time.
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*/
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#if !defined(HAVE_CURRENT_TIME)
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static inline struct timespec
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current_time(struct inode *ip)
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{
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return (timespec_trunc(current_kernel_time(), ip->i_sb->s_time_gran));
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}
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#endif
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/*
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* 4.16 API change
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* Added iversion interface for managing inode version field.
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*/
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#ifdef HAVE_INODE_SET_IVERSION
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#include <linux/iversion.h>
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#else
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static inline void
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inode_set_iversion(struct inode *ip, u64 val)
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{
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ip->i_version = val;
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}
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#endif
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/*
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* Returns true when called in the context of a 32-bit system call.
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*/
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static inline int
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zpl_is_32bit_api(void)
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{
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#ifdef CONFIG_COMPAT
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#ifdef HAVE_IN_COMPAT_SYSCALL
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return (in_compat_syscall());
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#else
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return (is_compat_task());
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#endif
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#else
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return (BITS_PER_LONG == 32);
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#endif
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}
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#endif /* _ZFS_VFS_H */
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