mirror of https://gitee.com/openkylin/linux.git
355 lines
9.8 KiB
C
355 lines
9.8 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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#include <linux/config.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 <spin.h>
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#include <sv.h>
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#include <mutex.h>
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#include <sema.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/move.h>
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#include <support/uuid.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 <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_behavior.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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#undef HAVE_REFCACHE /* reference cache not needed for NFS in 2.6 */
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#define HAVE_SENDFILE /* sendfile(2) exists in 2.6, but not in 2.4 */
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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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/*
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* State flag for unwritten extent buffers.
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*
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* We need to be able to distinguish between these and delayed
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* allocate buffers within XFS. The generic IO path code does
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* not need to distinguish - we use the BH_Delay flag for both
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* delalloc and these ondisk-uninitialised buffers.
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*/
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BUFFER_FNS(PrivateStart, unwritten);
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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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#ifndef raw_smp_processor_id
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#define raw_smp_processor_id() smp_processor_id()
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#endif
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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_fsuid(cred) (current->fsuid)
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#define current_fsgid(cred) (current->fsgid)
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#define NBPP PAGE_SIZE
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#define DPPSHFT (PAGE_SHIFT - 9)
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#define NDPP (1 << (PAGE_SHIFT - 9))
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#define dtop(DD) (((DD) + NDPP - 1) >> DPPSHFT)
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#define dtopt(DD) ((DD) >> DPPSHFT)
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#define dpoff(DD) ((DD) & (NDPP-1))
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#define NBBY 8 /* number of bits per byte */
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#define NBPC PAGE_SIZE /* Number of bytes per click */
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#define BPCSHIFT PAGE_SHIFT /* LOG2(NBPC) if exact */
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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 BPCSHIFT
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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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/* bytes to clicks */
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#define btoc(x) (((__psunsigned_t)(x)+(NBPC-1))>>BPCSHIFT)
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#define btoct(x) ((__psunsigned_t)(x)>>BPCSHIFT)
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#define btoc64(x) (((__uint64_t)(x)+(NBPC-1))>>BPCSHIFT)
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#define btoct64(x) ((__uint64_t)(x)>>BPCSHIFT)
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#define io_btoc(x) (((__psunsigned_t)(x)+(IO_NBPC-1))>>IO_BPCSHIFT)
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#define io_btoct(x) ((__psunsigned_t)(x)>>IO_BPCSHIFT)
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/* off_t bytes to clicks */
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#define offtoc(x) (((__uint64_t)(x)+(NBPC-1))>>BPCSHIFT)
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#define offtoct(x) ((xfs_off_t)(x)>>BPCSHIFT)
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/* clicks to off_t bytes */
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#define ctooff(x) ((xfs_off_t)(x)<<BPCSHIFT)
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/* clicks to bytes */
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#define ctob(x) ((__psunsigned_t)(x)<<BPCSHIFT)
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#define btoct(x) ((__psunsigned_t)(x)>>BPCSHIFT)
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#define ctob64(x) ((__uint64_t)(x)<<BPCSHIFT)
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#define io_ctob(x) ((__psunsigned_t)(x)<<IO_BPCSHIFT)
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/* bytes to clicks */
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#define btoc(x) (((__psunsigned_t)(x)+(NBPC-1))>>BPCSHIFT)
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#ifndef ENOATTR
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#define ENOATTR ENODATA /* Attribute not found */
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#endif
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/* Note: EWRONGFS never visible outside the kernel */
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#define EWRONGFS EINVAL /* Mount with wrong filesystem type */
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/*
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* XXX EFSCORRUPTED needs a real value in errno.h. asm-i386/errno.h won't
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* return codes out of its known range in errno.
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* XXX Also note: needs to be < 1000 and fairly unique on Linux (mustn't
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* conflict with any code we use already or any code a driver may use)
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* XXX Some options (currently we do #2):
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* 1/ New error code ["Filesystem is corrupted", _after_ glibc updated]
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* 2/ 990 ["Unknown error 990"]
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* 3/ EUCLEAN ["Structure needs cleaning"]
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* 4/ Convert EFSCORRUPTED to EIO [just prior to return into userspace]
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*/
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#define EFSCORRUPTED 990 /* 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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#define roundup(x, y) ((((x)+((y)-1))/(y))*(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(LINVFS_GET_IP(XFS_ITOV(ip)), (off)))
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#define xfs_statvfs_fsid(statp, mp) \
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({ u64 id = huge_encode_dev((mp)->m_ddev_targp->bt_dev); \
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__kernel_fsid_t *fsid = &(statp)->f_fsid; \
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(fsid->val[0] = (u32)id, fsid->val[1] = (u32)(id >> 32)); })
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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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#endif /* __XFS_LINUX__ */
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