/* * Copyright (c) 2000-2005 Silicon Graphics, Inc. * All Rights Reserved. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation. * * This program is distributed in the hope that it would be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */ #ifndef __XFS_LINUX__ #define __XFS_LINUX__ #include <linux/types.h> #include <linux/config.h> /* * Some types are conditional depending on the target system. * XFS_BIG_BLKNOS needs block layer disk addresses to be 64 bits. * XFS_BIG_INUMS needs the VFS inode number to be 64 bits, as well * as requiring XFS_BIG_BLKNOS to be set. */ #if defined(CONFIG_LBD) || (BITS_PER_LONG == 64) # define XFS_BIG_BLKNOS 1 # if BITS_PER_LONG == 64 # define XFS_BIG_INUMS 1 # else # define XFS_BIG_INUMS 0 # endif #else # define XFS_BIG_BLKNOS 0 # define XFS_BIG_INUMS 0 #endif #include <xfs_types.h> #include <xfs_arch.h> #include <kmem.h> #include <mrlock.h> #include <spin.h> #include <sv.h> #include <mutex.h> #include <sema.h> #include <time.h> #include <support/ktrace.h> #include <support/debug.h> #include <support/move.h> #include <support/uuid.h> #include <linux/mm.h> #include <linux/kernel.h> #include <linux/blkdev.h> #include <linux/slab.h> #include <linux/module.h> #include <linux/file.h> #include <linux/swap.h> #include <linux/errno.h> #include <linux/sched.h> #include <linux/bitops.h> #include <linux/major.h> #include <linux/pagemap.h> #include <linux/vfs.h> #include <linux/seq_file.h> #include <linux/init.h> #include <linux/list.h> #include <linux/proc_fs.h> #include <linux/sort.h> #include <linux/cpu.h> #include <linux/notifier.h> #include <linux/delay.h> #include <asm/page.h> #include <asm/div64.h> #include <asm/param.h> #include <asm/uaccess.h> #include <asm/byteorder.h> #include <asm/unaligned.h> #include <xfs_behavior.h> #include <xfs_vfs.h> #include <xfs_cred.h> #include <xfs_vnode.h> #include <xfs_stats.h> #include <xfs_sysctl.h> #include <xfs_iops.h> #include <xfs_aops.h> #include <xfs_super.h> #include <xfs_globals.h> #include <xfs_fs_subr.h> #include <xfs_lrw.h> #include <xfs_buf.h> /* * Feature macros (disable/enable) */ #undef HAVE_REFCACHE /* reference cache not needed for NFS in 2.6 */ #define HAVE_SENDFILE /* sendfile(2) exists in 2.6, but not in 2.4 */ #define HAVE_SPLICE /* a splice(2) exists in 2.6, but not in 2.4 */ #ifdef CONFIG_SMP #define HAVE_PERCPU_SB /* per cpu superblock counters are a 2.6 feature */ #else #undef HAVE_PERCPU_SB /* per cpu superblock counters are a 2.6 feature */ #endif /* * State flag for unwritten extent buffers. * * We need to be able to distinguish between these and delayed * allocate buffers within XFS. The generic IO path code does * not need to distinguish - we use the BH_Delay flag for both * delalloc and these ondisk-uninitialised buffers. */ BUFFER_FNS(PrivateStart, unwritten); #define restricted_chown xfs_params.restrict_chown.val #define irix_sgid_inherit xfs_params.sgid_inherit.val #define irix_symlink_mode xfs_params.symlink_mode.val #define xfs_panic_mask xfs_params.panic_mask.val #define xfs_error_level xfs_params.error_level.val #define xfs_syncd_centisecs xfs_params.syncd_timer.val #define xfs_stats_clear xfs_params.stats_clear.val #define xfs_inherit_sync xfs_params.inherit_sync.val #define xfs_inherit_nodump xfs_params.inherit_nodump.val #define xfs_inherit_noatime xfs_params.inherit_noatim.val #define xfs_buf_timer_centisecs xfs_params.xfs_buf_timer.val #define xfs_buf_age_centisecs xfs_params.xfs_buf_age.val #define xfs_inherit_nosymlinks xfs_params.inherit_nosym.val #define xfs_rotorstep xfs_params.rotorstep.val #ifndef raw_smp_processor_id #define raw_smp_processor_id() smp_processor_id() #endif #define current_cpu() raw_smp_processor_id() #define current_pid() (current->pid) #define current_fsuid(cred) (current->fsuid) #define current_fsgid(cred) (current->fsgid) #define NBPP PAGE_SIZE #define DPPSHFT (PAGE_SHIFT - 9) #define NDPP (1 << (PAGE_SHIFT - 9)) #define dtop(DD) (((DD) + NDPP - 1) >> DPPSHFT) #define dtopt(DD) ((DD) >> DPPSHFT) #define dpoff(DD) ((DD) & (NDPP-1)) #define NBBY 8 /* number of bits per byte */ #define NBPC PAGE_SIZE /* Number of bytes per click */ #define BPCSHIFT PAGE_SHIFT /* LOG2(NBPC) if exact */ /* * Size of block device i/o is parameterized here. * Currently the system supports page-sized i/o. */ #define BLKDEV_IOSHIFT BPCSHIFT #define BLKDEV_IOSIZE (1<<BLKDEV_IOSHIFT) /* number of BB's per block device block */ #define BLKDEV_BB BTOBB(BLKDEV_IOSIZE) /* bytes to clicks */ #define btoc(x) (((__psunsigned_t)(x)+(NBPC-1))>>BPCSHIFT) #define btoct(x) ((__psunsigned_t)(x)>>BPCSHIFT) #define btoc64(x) (((__uint64_t)(x)+(NBPC-1))>>BPCSHIFT) #define btoct64(x) ((__uint64_t)(x)>>BPCSHIFT) #define io_btoc(x) (((__psunsigned_t)(x)+(IO_NBPC-1))>>IO_BPCSHIFT) #define io_btoct(x) ((__psunsigned_t)(x)>>IO_BPCSHIFT) /* off_t bytes to clicks */ #define offtoc(x) (((__uint64_t)(x)+(NBPC-1))>>BPCSHIFT) #define offtoct(x) ((xfs_off_t)(x)>>BPCSHIFT) /* clicks to off_t bytes */ #define ctooff(x) ((xfs_off_t)(x)<<BPCSHIFT) /* clicks to bytes */ #define ctob(x) ((__psunsigned_t)(x)<<BPCSHIFT) #define btoct(x) ((__psunsigned_t)(x)>>BPCSHIFT) #define ctob64(x) ((__uint64_t)(x)<<BPCSHIFT) #define io_ctob(x) ((__psunsigned_t)(x)<<IO_BPCSHIFT) /* bytes to clicks */ #define btoc(x) (((__psunsigned_t)(x)+(NBPC-1))>>BPCSHIFT) #ifndef ENOATTR #define ENOATTR ENODATA /* Attribute not found */ #endif /* Note: EWRONGFS never visible outside the kernel */ #define EWRONGFS EINVAL /* Mount with wrong filesystem type */ /* * XXX EFSCORRUPTED needs a real value in errno.h. asm-i386/errno.h won't * return codes out of its known range in errno. * XXX Also note: needs to be < 1000 and fairly unique on Linux (mustn't * conflict with any code we use already or any code a driver may use) * XXX Some options (currently we do #2): * 1/ New error code ["Filesystem is corrupted", _after_ glibc updated] * 2/ 990 ["Unknown error 990"] * 3/ EUCLEAN ["Structure needs cleaning"] * 4/ Convert EFSCORRUPTED to EIO [just prior to return into userspace] */ #define EFSCORRUPTED 990 /* Filesystem is corrupted */ #define SYNCHRONIZE() barrier() #define __return_address __builtin_return_address(0) /* * IRIX (BSD) quotactl makes use of separate commands for user/group, * whereas on Linux the syscall encodes this information into the cmd * field (see the QCMD macro in quota.h). These macros help keep the * code portable - they are not visible from the syscall interface. */ #define Q_XSETGQLIM XQM_CMD(8) /* set groups disk limits */ #define Q_XGETGQUOTA XQM_CMD(9) /* get groups disk limits */ #define Q_XSETPQLIM XQM_CMD(10) /* set projects disk limits */ #define Q_XGETPQUOTA XQM_CMD(11) /* get projects disk limits */ #define dfltprid 0 #define MAXPATHLEN 1024 #define MIN(a,b) (min(a,b)) #define MAX(a,b) (max(a,b)) #define howmany(x, y) (((x)+((y)-1))/(y)) #define roundup(x, y) ((((x)+((y)-1))/(y))*(y)) /* * Various platform dependent calls that don't fit anywhere else */ #define xfs_sort(a,n,s,fn) sort(a,n,s,fn,NULL) #define xfs_stack_trace() dump_stack() #define xfs_itruncate_data(ip, off) \ (-vmtruncate(vn_to_inode(XFS_ITOV(ip)), (off))) #define xfs_statvfs_fsid(statp, mp) \ ({ u64 id = huge_encode_dev((mp)->m_ddev_targp->bt_dev); \ __kernel_fsid_t *fsid = &(statp)->f_fsid; \ (fsid->val[0] = (u32)id, fsid->val[1] = (u32)(id >> 32)); }) /* Move the kernel do_div definition off to one side */ #if defined __i386__ /* For ia32 we need to pull some tricks to get past various versions * of the compiler which do not like us using do_div in the middle * of large functions. */ static inline __u32 xfs_do_div(void *a, __u32 b, int n) { __u32 mod; switch (n) { case 4: mod = *(__u32 *)a % b; *(__u32 *)a = *(__u32 *)a / b; return mod; case 8: { unsigned long __upper, __low, __high, __mod; __u64 c = *(__u64 *)a; __upper = __high = c >> 32; __low = c; if (__high) { __upper = __high % (b); __high = __high / (b); } asm("divl %2":"=a" (__low), "=d" (__mod):"rm" (b), "0" (__low), "1" (__upper)); asm("":"=A" (c):"a" (__low),"d" (__high)); *(__u64 *)a = c; return __mod; } } /* NOTREACHED */ return 0; } /* Side effect free 64 bit mod operation */ static inline __u32 xfs_do_mod(void *a, __u32 b, int n) { switch (n) { case 4: return *(__u32 *)a % b; case 8: { unsigned long __upper, __low, __high, __mod; __u64 c = *(__u64 *)a; __upper = __high = c >> 32; __low = c; if (__high) { __upper = __high % (b); __high = __high / (b); } asm("divl %2":"=a" (__low), "=d" (__mod):"rm" (b), "0" (__low), "1" (__upper)); asm("":"=A" (c):"a" (__low),"d" (__high)); return __mod; } } /* NOTREACHED */ return 0; } #else static inline __u32 xfs_do_div(void *a, __u32 b, int n) { __u32 mod; switch (n) { case 4: mod = *(__u32 *)a % b; *(__u32 *)a = *(__u32 *)a / b; return mod; case 8: mod = do_div(*(__u64 *)a, b); return mod; } /* NOTREACHED */ return 0; } /* Side effect free 64 bit mod operation */ static inline __u32 xfs_do_mod(void *a, __u32 b, int n) { switch (n) { case 4: return *(__u32 *)a % b; case 8: { __u64 c = *(__u64 *)a; return do_div(c, b); } } /* NOTREACHED */ return 0; } #endif #undef do_div #define do_div(a, b) xfs_do_div(&(a), (b), sizeof(a)) #define do_mod(a, b) xfs_do_mod(&(a), (b), sizeof(a)) static inline __uint64_t roundup_64(__uint64_t x, __uint32_t y) { x += y - 1; do_div(x, y); return(x * y); } #endif /* __XFS_LINUX__ */