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802e7b5feb
The approach taken was the rework zfs_holey() as little as possible and then just wrap the code as needed to ensure correct locking and error handling. Tested with xfstests 285 and 286. All tests pass except for 7-9 of 285 which try to reserve blocks first via fallocate(2) and fail because fallocate(2) is not yet supported. Note that the filp->f_lock spinlock did not exist prior to Linux 2.6.30, but we avoid the need for autotools check by virtue of the fact that SEEK_DATA/SEEK_HOLE support was not added until Linux 3.1. An autoconf check was added for lseek_execute() which is currently a private function but the expectation is that it will be exported perhaps as early as Linux 3.11. Reviewed-by: Richard Laager <rlaager@wiktel.com> Signed-off-by: Richard Yao <ryao@gentoo.org> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #1384
178 lines
4.7 KiB
C
178 lines
4.7 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 (C) 2011 Lawrence Livermore National Security, LLC.
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*/
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#ifndef _ZFS_VFS_H
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#define _ZFS_VFS_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 acceptible 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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#if defined(HAVE_BDI) && !defined(HAVE_BDI_SETUP_AND_REGISTER)
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/*
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* 2.6.34 API change,
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* Add bdi_setup_and_register() function if not yet provided by kernel.
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* It is used to quickly initialize and register a BDI for the filesystem.
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*/
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extern atomic_long_t zfs_bdi_seq;
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static inline int
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bdi_setup_and_register(struct backing_dev_info *bdi,char *name,unsigned int cap)
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{
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char tmp[32];
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int error;
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bdi->name = name;
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bdi->capabilities = cap;
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error = bdi_init(bdi);
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if (error)
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return (error);
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sprintf(tmp, "%.28s%s", name, "-%d");
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error = bdi_register(bdi, NULL, tmp,
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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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return (error);
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}
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return (error);
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}
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#endif /* HAVE_BDI && !HAVE_BDI_SETUP_AND_REGISTER */
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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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#define ZFS_IOC_GETFLAGS FS_IOC_GETFLAGS
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#define ZFS_IOC_SETFLAGS FS_IOC_SETFLAGS
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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(struct file *filp, struct inode *inode,
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loff_t offset, 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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#endif /* _ZFS_VFS_H */
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