9e2b2dc413
The patches that are intended to introduce copy-on-write credentials for 2.6.28 require abstraction of access to some fields of the task structure, particularly for the case of one task accessing another's credentials where RCU will have to be observed. Introduced here are trivial no-op versions of the desired accessors for current and other tasks so that other subsystems can start to be converted over more easily. Wrappers are introduced into a new header (linux/cred.h) for UID/GID, EUID/EGID, SUID/SGID, FSUID/FSGID, cap_effective and current's subscribed user_struct. These wrappers are macros because the ordering between header files mitigates against making them inline functions. linux/cred.h is #included from linux/sched.h. Further, XFS is modified such that it no longer defines and uses parameterised versions of current_fs[ug]id(), thus getting rid of the namespace collision otherwise incurred. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: James Morris <jmorris@namei.org>
309 lines
7.9 KiB
C
309 lines
7.9 KiB
C
/*
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* Copyright (c) 2000-2005 Silicon Graphics, Inc.
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* All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it would be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef __XFS_LINUX__
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#define __XFS_LINUX__
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#include <linux/types.h>
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/*
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* Some types are conditional depending on the target system.
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* XFS_BIG_BLKNOS needs block layer disk addresses to be 64 bits.
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* XFS_BIG_INUMS needs the VFS inode number to be 64 bits, as well
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* as requiring XFS_BIG_BLKNOS to be set.
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*/
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#if defined(CONFIG_LBD) || (BITS_PER_LONG == 64)
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# define XFS_BIG_BLKNOS 1
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# if BITS_PER_LONG == 64
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# define XFS_BIG_INUMS 1
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# else
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# define XFS_BIG_INUMS 0
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# endif
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#else
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# define XFS_BIG_BLKNOS 0
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# define XFS_BIG_INUMS 0
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#endif
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#include <xfs_types.h>
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#include <xfs_arch.h>
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#include <kmem.h>
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#include <mrlock.h>
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#include <sv.h>
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#include <mutex.h>
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#include <time.h>
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#include <support/ktrace.h>
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#include <support/debug.h>
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#include <support/uuid.h>
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#include <linux/semaphore.h>
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#include <linux/mm.h>
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#include <linux/kernel.h>
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#include <linux/blkdev.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/file.h>
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#include <linux/swap.h>
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#include <linux/errno.h>
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#include <linux/sched.h>
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#include <linux/bitops.h>
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#include <linux/major.h>
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#include <linux/pagemap.h>
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#include <linux/vfs.h>
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#include <linux/seq_file.h>
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#include <linux/init.h>
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#include <linux/list.h>
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#include <linux/proc_fs.h>
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#include <linux/sort.h>
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#include <linux/cpu.h>
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#include <linux/notifier.h>
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#include <linux/delay.h>
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#include <linux/log2.h>
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#include <linux/spinlock.h>
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#include <linux/random.h>
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#include <linux/ctype.h>
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#include <asm/page.h>
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#include <asm/div64.h>
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#include <asm/param.h>
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#include <asm/uaccess.h>
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#include <asm/byteorder.h>
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#include <asm/unaligned.h>
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#include <xfs_vfs.h>
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#include <xfs_cred.h>
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#include <xfs_vnode.h>
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#include <xfs_stats.h>
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#include <xfs_sysctl.h>
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#include <xfs_iops.h>
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#include <xfs_aops.h>
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#include <xfs_super.h>
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#include <xfs_globals.h>
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#include <xfs_fs_subr.h>
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#include <xfs_lrw.h>
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#include <xfs_buf.h>
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/*
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* Feature macros (disable/enable)
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*/
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#ifdef CONFIG_SMP
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#define HAVE_PERCPU_SB /* per cpu superblock counters are a 2.6 feature */
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#else
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#undef HAVE_PERCPU_SB /* per cpu superblock counters are a 2.6 feature */
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#endif
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#define restricted_chown xfs_params.restrict_chown.val
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#define irix_sgid_inherit xfs_params.sgid_inherit.val
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#define irix_symlink_mode xfs_params.symlink_mode.val
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#define xfs_panic_mask xfs_params.panic_mask.val
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#define xfs_error_level xfs_params.error_level.val
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#define xfs_syncd_centisecs xfs_params.syncd_timer.val
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#define xfs_stats_clear xfs_params.stats_clear.val
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#define xfs_inherit_sync xfs_params.inherit_sync.val
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#define xfs_inherit_nodump xfs_params.inherit_nodump.val
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#define xfs_inherit_noatime xfs_params.inherit_noatim.val
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#define xfs_buf_timer_centisecs xfs_params.xfs_buf_timer.val
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#define xfs_buf_age_centisecs xfs_params.xfs_buf_age.val
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#define xfs_inherit_nosymlinks xfs_params.inherit_nosym.val
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#define xfs_rotorstep xfs_params.rotorstep.val
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#define xfs_inherit_nodefrag xfs_params.inherit_nodfrg.val
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#define xfs_fstrm_centisecs xfs_params.fstrm_timer.val
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#define current_cpu() (raw_smp_processor_id())
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#define current_pid() (current->pid)
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#define current_test_flags(f) (current->flags & (f))
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#define current_set_flags_nested(sp, f) \
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(*(sp) = current->flags, current->flags |= (f))
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#define current_clear_flags_nested(sp, f) \
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(*(sp) = current->flags, current->flags &= ~(f))
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#define current_restore_flags_nested(sp, f) \
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(current->flags = ((current->flags & ~(f)) | (*(sp) & (f))))
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#define spinlock_destroy(lock)
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#define NBBY 8 /* number of bits per byte */
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/*
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* Size of block device i/o is parameterized here.
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* Currently the system supports page-sized i/o.
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*/
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#define BLKDEV_IOSHIFT PAGE_CACHE_SHIFT
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#define BLKDEV_IOSIZE (1<<BLKDEV_IOSHIFT)
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/* number of BB's per block device block */
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#define BLKDEV_BB BTOBB(BLKDEV_IOSIZE)
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#define ENOATTR ENODATA /* Attribute not found */
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#define EWRONGFS EINVAL /* Mount with wrong filesystem type */
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#define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */
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#define SYNCHRONIZE() barrier()
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#define __return_address __builtin_return_address(0)
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/*
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* IRIX (BSD) quotactl makes use of separate commands for user/group,
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* whereas on Linux the syscall encodes this information into the cmd
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* field (see the QCMD macro in quota.h). These macros help keep the
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* code portable - they are not visible from the syscall interface.
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*/
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#define Q_XSETGQLIM XQM_CMD(8) /* set groups disk limits */
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#define Q_XGETGQUOTA XQM_CMD(9) /* get groups disk limits */
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#define Q_XSETPQLIM XQM_CMD(10) /* set projects disk limits */
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#define Q_XGETPQUOTA XQM_CMD(11) /* get projects disk limits */
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#define dfltprid 0
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#define MAXPATHLEN 1024
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#define MIN(a,b) (min(a,b))
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#define MAX(a,b) (max(a,b))
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#define howmany(x, y) (((x)+((y)-1))/(y))
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/*
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* Various platform dependent calls that don't fit anywhere else
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*/
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#define xfs_sort(a,n,s,fn) sort(a,n,s,fn,NULL)
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#define xfs_stack_trace() dump_stack()
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#define xfs_itruncate_data(ip, off) \
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(-vmtruncate(VFS_I(ip), (off)))
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/* Move the kernel do_div definition off to one side */
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#if defined __i386__
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/* For ia32 we need to pull some tricks to get past various versions
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* of the compiler which do not like us using do_div in the middle
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* of large functions.
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*/
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static inline __u32 xfs_do_div(void *a, __u32 b, int n)
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{
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__u32 mod;
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switch (n) {
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case 4:
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mod = *(__u32 *)a % b;
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*(__u32 *)a = *(__u32 *)a / b;
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return mod;
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case 8:
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{
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unsigned long __upper, __low, __high, __mod;
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__u64 c = *(__u64 *)a;
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__upper = __high = c >> 32;
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__low = c;
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if (__high) {
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__upper = __high % (b);
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__high = __high / (b);
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}
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asm("divl %2":"=a" (__low), "=d" (__mod):"rm" (b), "0" (__low), "1" (__upper));
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asm("":"=A" (c):"a" (__low),"d" (__high));
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*(__u64 *)a = c;
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return __mod;
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}
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}
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/* NOTREACHED */
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return 0;
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}
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/* Side effect free 64 bit mod operation */
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static inline __u32 xfs_do_mod(void *a, __u32 b, int n)
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{
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switch (n) {
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case 4:
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return *(__u32 *)a % b;
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case 8:
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{
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unsigned long __upper, __low, __high, __mod;
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__u64 c = *(__u64 *)a;
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__upper = __high = c >> 32;
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__low = c;
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if (__high) {
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__upper = __high % (b);
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__high = __high / (b);
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}
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asm("divl %2":"=a" (__low), "=d" (__mod):"rm" (b), "0" (__low), "1" (__upper));
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asm("":"=A" (c):"a" (__low),"d" (__high));
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return __mod;
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}
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}
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/* NOTREACHED */
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return 0;
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}
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#else
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static inline __u32 xfs_do_div(void *a, __u32 b, int n)
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{
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__u32 mod;
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switch (n) {
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case 4:
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mod = *(__u32 *)a % b;
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*(__u32 *)a = *(__u32 *)a / b;
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return mod;
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case 8:
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mod = do_div(*(__u64 *)a, b);
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return mod;
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}
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/* NOTREACHED */
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return 0;
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}
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/* Side effect free 64 bit mod operation */
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static inline __u32 xfs_do_mod(void *a, __u32 b, int n)
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{
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switch (n) {
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case 4:
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return *(__u32 *)a % b;
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case 8:
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{
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__u64 c = *(__u64 *)a;
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return do_div(c, b);
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}
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}
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/* NOTREACHED */
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return 0;
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}
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#endif
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#undef do_div
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#define do_div(a, b) xfs_do_div(&(a), (b), sizeof(a))
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#define do_mod(a, b) xfs_do_mod(&(a), (b), sizeof(a))
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static inline __uint64_t roundup_64(__uint64_t x, __uint32_t y)
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{
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x += y - 1;
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do_div(x, y);
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return(x * y);
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}
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static inline __uint64_t howmany_64(__uint64_t x, __uint32_t y)
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{
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x += y - 1;
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do_div(x, y);
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return x;
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}
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/* ARM old ABI has some weird alignment/padding */
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#if defined(__arm__) && !defined(__ARM_EABI__)
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#define __arch_pack __attribute__((packed))
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#else
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#define __arch_pack
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#endif
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#endif /* __XFS_LINUX__ */
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