322 lines
8.2 KiB
C
322 lines
8.2 KiB
C
/*
|
|
* CDDL HEADER START
|
|
*
|
|
* The contents of this file are subject to the terms of the
|
|
* Common Development and Distribution License (the "License").
|
|
* You may not use this file except in compliance with the License.
|
|
*
|
|
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
|
|
* or http://www.opensolaris.org/os/licensing.
|
|
* See the License for the specific language governing permissions
|
|
* and limitations under the License.
|
|
*
|
|
* When distributing Covered Code, include this CDDL HEADER in each
|
|
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
|
|
* If applicable, add the following below this CDDL HEADER, with the
|
|
* fields enclosed by brackets "[]" replaced with your own identifying
|
|
* information: Portions Copyright [yyyy] [name of copyright owner]
|
|
*
|
|
* CDDL HEADER END
|
|
*/
|
|
|
|
/*
|
|
* Copyright (C) 2011 Lawrence Livermore National Security, LLC.
|
|
*/
|
|
|
|
#ifndef _ZFS_VFS_H
|
|
#define _ZFS_VFS_H
|
|
|
|
/*
|
|
* 2.6.28 API change,
|
|
* Added insert_inode_locked() helper function, prior to this most callers
|
|
* used insert_inode_hash(). The older method doesn't check for collisions
|
|
* in the inode_hashtable but it still acceptible for use.
|
|
*/
|
|
#ifndef HAVE_INSERT_INODE_LOCKED
|
|
static inline int
|
|
insert_inode_locked(struct inode *ip)
|
|
{
|
|
insert_inode_hash(ip);
|
|
return (0);
|
|
}
|
|
#endif /* HAVE_INSERT_INODE_LOCKED */
|
|
|
|
/*
|
|
* 2.6.35 API change,
|
|
* Add truncate_setsize() if it is not exported by the Linux kernel.
|
|
*
|
|
* Truncate the inode and pages associated with the inode. The pages are
|
|
* unmapped and removed from cache.
|
|
*/
|
|
#ifndef HAVE_TRUNCATE_SETSIZE
|
|
static inline void
|
|
truncate_setsize(struct inode *ip, loff_t new)
|
|
{
|
|
struct address_space *mapping = ip->i_mapping;
|
|
|
|
i_size_write(ip, new);
|
|
|
|
unmap_mapping_range(mapping, new + PAGE_SIZE - 1, 0, 1);
|
|
truncate_inode_pages(mapping, new);
|
|
unmap_mapping_range(mapping, new + PAGE_SIZE - 1, 0, 1);
|
|
}
|
|
#endif /* HAVE_TRUNCATE_SETSIZE */
|
|
|
|
#if defined(HAVE_BDI) && !defined(HAVE_BDI_SETUP_AND_REGISTER)
|
|
/*
|
|
* 2.6.34 API change,
|
|
* Add bdi_setup_and_register() function if not yet provided by kernel.
|
|
* It is used to quickly initialize and register a BDI for the filesystem.
|
|
*/
|
|
extern atomic_long_t zfs_bdi_seq;
|
|
|
|
static inline int
|
|
bdi_setup_and_register(struct backing_dev_info *bdi,char *name,unsigned int cap)
|
|
{
|
|
char tmp[32];
|
|
int error;
|
|
|
|
bdi->name = name;
|
|
bdi->capabilities = cap;
|
|
error = bdi_init(bdi);
|
|
if (error)
|
|
return (error);
|
|
|
|
sprintf(tmp, "%.28s%s", name, "-%d");
|
|
error = bdi_register(bdi, NULL, tmp,
|
|
atomic_long_inc_return(&zfs_bdi_seq));
|
|
if (error) {
|
|
bdi_destroy(bdi);
|
|
return (error);
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
#endif /* HAVE_BDI && !HAVE_BDI_SETUP_AND_REGISTER */
|
|
|
|
/*
|
|
* 2.6.38 API change,
|
|
* LOOKUP_RCU flag introduced to distinguish rcu-walk from ref-walk cases.
|
|
*/
|
|
#ifndef LOOKUP_RCU
|
|
#define LOOKUP_RCU 0x0
|
|
#endif /* LOOKUP_RCU */
|
|
|
|
/*
|
|
* 3.2-rc1 API change,
|
|
* Add set_nlink() if it is not exported by the Linux kernel.
|
|
*
|
|
* i_nlink is read-only in Linux 3.2, but it can be set directly in
|
|
* earlier kernels.
|
|
*/
|
|
#ifndef HAVE_SET_NLINK
|
|
static inline void
|
|
set_nlink(struct inode *inode, unsigned int nlink)
|
|
{
|
|
inode->i_nlink = nlink;
|
|
}
|
|
#endif /* HAVE_SET_NLINK */
|
|
|
|
/*
|
|
* 3.3 API change,
|
|
* The VFS .create, .mkdir and .mknod callbacks were updated to take a
|
|
* umode_t type rather than an int. To cleanly handle both definitions
|
|
* the zpl_umode_t type is introduced and set accordingly.
|
|
*/
|
|
#ifdef HAVE_MKDIR_UMODE_T
|
|
typedef umode_t zpl_umode_t;
|
|
#else
|
|
typedef int zpl_umode_t;
|
|
#endif
|
|
|
|
/*
|
|
* 3.5 API change,
|
|
* The clear_inode() function replaces end_writeback() and introduces an
|
|
* ordering change regarding when the inode_sync_wait() occurs. See the
|
|
* configure check in config/kernel-clear-inode.m4 for full details.
|
|
*/
|
|
#if defined(HAVE_EVICT_INODE) && !defined(HAVE_CLEAR_INODE)
|
|
#define clear_inode(ip) end_writeback(ip)
|
|
#endif /* HAVE_EVICT_INODE && !HAVE_CLEAR_INODE */
|
|
|
|
/*
|
|
* 3.6 API change,
|
|
* The sget() helper function now takes the mount flags as an argument.
|
|
*/
|
|
#ifdef HAVE_5ARG_SGET
|
|
#define zpl_sget(type, cmp, set, fl, mtd) sget(type, cmp, set, fl, mtd)
|
|
#else
|
|
#define zpl_sget(type, cmp, set, fl, mtd) sget(type, cmp, set, mtd)
|
|
#endif /* HAVE_5ARG_SGET */
|
|
|
|
#define ZFS_IOC_GETFLAGS FS_IOC_GETFLAGS
|
|
#define ZFS_IOC_SETFLAGS FS_IOC_SETFLAGS
|
|
|
|
#if defined(SEEK_HOLE) && defined(SEEK_DATA) && !defined(HAVE_LSEEK_EXECUTE)
|
|
static inline loff_t
|
|
lseek_execute(struct file *filp, struct inode *inode,
|
|
loff_t offset, loff_t maxsize)
|
|
{
|
|
if (offset < 0 && !(filp->f_mode & FMODE_UNSIGNED_OFFSET))
|
|
return (-EINVAL);
|
|
|
|
if (offset > maxsize)
|
|
return (-EINVAL);
|
|
|
|
if (offset != filp->f_pos) {
|
|
spin_lock(&filp->f_lock);
|
|
filp->f_pos = offset;
|
|
filp->f_version = 0;
|
|
spin_unlock(&filp->f_lock);
|
|
}
|
|
|
|
return (offset);
|
|
}
|
|
#endif /* SEEK_HOLE && SEEK_DATA && !HAVE_LSEEK_EXECUTE */
|
|
|
|
#if defined(CONFIG_FS_POSIX_ACL)
|
|
/*
|
|
* These functions safely approximates the behavior of posix_acl_release()
|
|
* which cannot be used because it calls the GPL-only symbol kfree_rcu().
|
|
* The in-kernel version, which can access the RCU, frees the ACLs after
|
|
* the grace period expires. Because we're unsure how long that grace
|
|
* period may be this implementation conservatively delays for 60 seconds.
|
|
* This is several orders of magnitude larger than expected grace period.
|
|
* At 60 seconds the kernel will also begin issuing RCU stall warnings.
|
|
*/
|
|
#include <linux/posix_acl.h>
|
|
#ifndef HAVE_POSIX_ACL_CACHING
|
|
#define ACL_NOT_CACHED ((void *)(-1))
|
|
#endif /* HAVE_POSIX_ACL_CACHING */
|
|
|
|
#if defined(HAVE_POSIX_ACL_RELEASE) && !defined(HAVE_POSIX_ACL_RELEASE_GPL_ONLY)
|
|
|
|
#define zpl_posix_acl_release(arg) posix_acl_release(arg)
|
|
#define zpl_set_cached_acl(ip, ty, n) set_cached_acl(ip, ty, n)
|
|
#define zpl_forget_cached_acl(ip, ty) forget_cached_acl(ip, ty)
|
|
|
|
#else
|
|
|
|
static inline void
|
|
zpl_posix_acl_free(void *arg) {
|
|
kfree(arg);
|
|
}
|
|
|
|
static inline void
|
|
zpl_posix_acl_release(struct posix_acl *acl)
|
|
{
|
|
if ((acl == NULL) || (acl == ACL_NOT_CACHED))
|
|
return;
|
|
|
|
if (atomic_dec_and_test(&acl->a_refcount)) {
|
|
taskq_dispatch_delay(system_taskq, zpl_posix_acl_free, acl,
|
|
TQ_SLEEP, ddi_get_lbolt() + 60*HZ);
|
|
}
|
|
}
|
|
|
|
static inline void
|
|
zpl_set_cached_acl(struct inode *ip, int type, struct posix_acl *newer) {
|
|
#ifdef HAVE_POSIX_ACL_CACHING
|
|
struct posix_acl *older = NULL;
|
|
|
|
spin_lock(&ip->i_lock);
|
|
|
|
if ((newer != ACL_NOT_CACHED) && (newer != NULL))
|
|
posix_acl_dup(newer);
|
|
|
|
switch(type) {
|
|
case ACL_TYPE_ACCESS:
|
|
older = ip->i_acl;
|
|
rcu_assign_pointer(ip->i_acl,newer);
|
|
break;
|
|
case ACL_TYPE_DEFAULT:
|
|
older = ip->i_default_acl;
|
|
rcu_assign_pointer(ip->i_default_acl,newer);
|
|
break;
|
|
}
|
|
|
|
spin_unlock(&ip->i_lock);
|
|
|
|
zpl_posix_acl_release(older);
|
|
#endif /* HAVE_POSIX_ACL_CACHING */
|
|
}
|
|
|
|
static inline void
|
|
zpl_forget_cached_acl(struct inode *ip, int type) {
|
|
zpl_set_cached_acl(ip, type, (struct posix_acl *)ACL_NOT_CACHED);
|
|
}
|
|
#endif /* HAVE_POSIX_ACL_RELEASE */
|
|
|
|
/*
|
|
* 2.6.38 API change,
|
|
* The is_owner_or_cap() function was renamed to inode_owner_or_capable().
|
|
*/
|
|
#ifdef HAVE_INODE_OWNER_OR_CAPABLE
|
|
#define zpl_inode_owner_or_capable(ip) inode_owner_or_capable(ip)
|
|
#else
|
|
#define zpl_inode_owner_or_capable(ip) is_owner_or_cap(ip)
|
|
#endif /* HAVE_INODE_OWNER_OR_CAPABLE */
|
|
|
|
#ifndef HAVE_POSIX_ACL_CHMOD
|
|
static inline int
|
|
posix_acl_chmod(struct posix_acl **acl, int flags, umode_t umode) {
|
|
struct posix_acl *oldacl = *acl;
|
|
mode_t mode = umode;
|
|
int error;
|
|
|
|
*acl = posix_acl_clone(*acl, flags);
|
|
zpl_posix_acl_release(oldacl);
|
|
|
|
if (!(*acl))
|
|
return (-ENOMEM);
|
|
|
|
error = posix_acl_chmod_masq(*acl, mode);
|
|
if (error) {
|
|
zpl_posix_acl_release(*acl);
|
|
*acl = NULL;
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
|
|
static inline int
|
|
posix_acl_create(struct posix_acl** acl, int flags, umode_t* umodep) {
|
|
struct posix_acl *oldacl = *acl;
|
|
mode_t mode = *umodep;
|
|
int error;
|
|
|
|
*acl = posix_acl_clone(*acl, flags);
|
|
zpl_posix_acl_release(oldacl);
|
|
|
|
if (!(*acl))
|
|
return (-ENOMEM);
|
|
|
|
error = posix_acl_create_masq(*acl, &mode);
|
|
*umodep = mode;
|
|
|
|
if (error < 0) {
|
|
zpl_posix_acl_release(*acl);
|
|
*acl = NULL;
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
#endif /* HAVE_POSIX_ACL_CHMOD */
|
|
|
|
#ifndef HAVE_CURRENT_UMASK
|
|
static inline int
|
|
current_umask(void)
|
|
{
|
|
return (current->fs->umask);
|
|
}
|
|
#endif /* HAVE_CURRENT_UMASK */
|
|
|
|
#ifdef HAVE_POSIX_ACL_EQUIV_MODE_UMODE_T
|
|
typedef umode_t zpl_equivmode_t;
|
|
#else
|
|
typedef mode_t zpl_equivmode_t;
|
|
#endif /* HAVE_POSIX_ACL_EQUIV_MODE_UMODE_T */
|
|
#endif /* CONFIG_FS_POSIX_ACL */
|
|
|
|
#endif /* _ZFS_VFS_H */
|