Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Nathan Scott | 7b71876 | 2005-11-02 14:58:39 +1100 | [diff] [blame] | 2 | * Copyright (c) 2000-2005 Silicon Graphics, Inc. |
| 3 | * All Rights Reserved. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | * |
Nathan Scott | 7b71876 | 2005-11-02 14:58:39 +1100 | [diff] [blame] | 5 | * This program is free software; you can redistribute it and/or |
| 6 | * modify it under the terms of the GNU General Public License as |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 7 | * published by the Free Software Foundation. |
| 8 | * |
Nathan Scott | 7b71876 | 2005-11-02 14:58:39 +1100 | [diff] [blame] | 9 | * This program is distributed in the hope that it would be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | * |
Nathan Scott | 7b71876 | 2005-11-02 14:58:39 +1100 | [diff] [blame] | 14 | * You should have received a copy of the GNU General Public License |
| 15 | * along with this program; if not, write the Free Software Foundation, |
| 16 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | */ |
| 18 | #ifndef __XFS_LINUX__ |
| 19 | #define __XFS_LINUX__ |
| 20 | |
| 21 | #include <linux/types.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | |
| 23 | /* |
| 24 | * Some types are conditional depending on the target system. |
| 25 | * XFS_BIG_BLKNOS needs block layer disk addresses to be 64 bits. |
| 26 | * XFS_BIG_INUMS needs the VFS inode number to be 64 bits, as well |
| 27 | * as requiring XFS_BIG_BLKNOS to be set. |
| 28 | */ |
| 29 | #if defined(CONFIG_LBD) || (BITS_PER_LONG == 64) |
| 30 | # define XFS_BIG_BLKNOS 1 |
| 31 | # if BITS_PER_LONG == 64 |
| 32 | # define XFS_BIG_INUMS 1 |
| 33 | # else |
| 34 | # define XFS_BIG_INUMS 0 |
| 35 | # endif |
| 36 | #else |
| 37 | # define XFS_BIG_BLKNOS 0 |
| 38 | # define XFS_BIG_INUMS 0 |
| 39 | #endif |
| 40 | |
| 41 | #include <xfs_types.h> |
| 42 | #include <xfs_arch.h> |
| 43 | |
| 44 | #include <kmem.h> |
| 45 | #include <mrlock.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | #include <sv.h> |
| 47 | #include <mutex.h> |
| 48 | #include <sema.h> |
| 49 | #include <time.h> |
| 50 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | #include <support/ktrace.h> |
| 52 | #include <support/debug.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | #include <support/uuid.h> |
| 54 | |
| 55 | #include <linux/mm.h> |
| 56 | #include <linux/kernel.h> |
| 57 | #include <linux/blkdev.h> |
| 58 | #include <linux/slab.h> |
| 59 | #include <linux/module.h> |
| 60 | #include <linux/file.h> |
| 61 | #include <linux/swap.h> |
| 62 | #include <linux/errno.h> |
| 63 | #include <linux/sched.h> |
| 64 | #include <linux/bitops.h> |
| 65 | #include <linux/major.h> |
| 66 | #include <linux/pagemap.h> |
| 67 | #include <linux/vfs.h> |
| 68 | #include <linux/seq_file.h> |
| 69 | #include <linux/init.h> |
| 70 | #include <linux/list.h> |
| 71 | #include <linux/proc_fs.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | #include <linux/sort.h> |
David Chinner | e8234a6 | 2006-03-14 13:23:52 +1100 | [diff] [blame] | 73 | #include <linux/cpu.h> |
| 74 | #include <linux/notifier.h> |
David Chinner | 01e1b69 | 2006-03-14 13:29:16 +1100 | [diff] [blame] | 75 | #include <linux/delay.h> |
Eric Sandeen | af3a2e8 | 2007-08-16 16:25:23 +1000 | [diff] [blame] | 76 | #include <linux/log2.h> |
Eric Sandeen | 007c61c | 2007-10-11 17:43:56 +1000 | [diff] [blame] | 77 | #include <linux/spinlock.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | |
| 79 | #include <asm/page.h> |
| 80 | #include <asm/div64.h> |
| 81 | #include <asm/param.h> |
| 82 | #include <asm/uaccess.h> |
| 83 | #include <asm/byteorder.h> |
| 84 | #include <asm/unaligned.h> |
| 85 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | #include <xfs_vfs.h> |
| 87 | #include <xfs_cred.h> |
| 88 | #include <xfs_vnode.h> |
| 89 | #include <xfs_stats.h> |
| 90 | #include <xfs_sysctl.h> |
| 91 | #include <xfs_iops.h> |
Christoph Hellwig | 0829c36 | 2005-09-02 16:58:49 +1000 | [diff] [blame] | 92 | #include <xfs_aops.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | #include <xfs_super.h> |
| 94 | #include <xfs_globals.h> |
| 95 | #include <xfs_fs_subr.h> |
| 96 | #include <xfs_lrw.h> |
| 97 | #include <xfs_buf.h> |
| 98 | |
| 99 | /* |
| 100 | * Feature macros (disable/enable) |
| 101 | */ |
Nathan Scott | d2c32ed | 2006-03-14 13:20:13 +1100 | [diff] [blame] | 102 | #ifdef CONFIG_SMP |
David Chinner | 8d280b9 | 2006-03-14 13:13:09 +1100 | [diff] [blame] | 103 | #define HAVE_PERCPU_SB /* per cpu superblock counters are a 2.6 feature */ |
| 104 | #else |
| 105 | #undef HAVE_PERCPU_SB /* per cpu superblock counters are a 2.6 feature */ |
| 106 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | #define restricted_chown xfs_params.restrict_chown.val |
| 109 | #define irix_sgid_inherit xfs_params.sgid_inherit.val |
| 110 | #define irix_symlink_mode xfs_params.symlink_mode.val |
| 111 | #define xfs_panic_mask xfs_params.panic_mask.val |
| 112 | #define xfs_error_level xfs_params.error_level.val |
| 113 | #define xfs_syncd_centisecs xfs_params.syncd_timer.val |
| 114 | #define xfs_stats_clear xfs_params.stats_clear.val |
| 115 | #define xfs_inherit_sync xfs_params.inherit_sync.val |
| 116 | #define xfs_inherit_nodump xfs_params.inherit_nodump.val |
| 117 | #define xfs_inherit_noatime xfs_params.inherit_noatim.val |
| 118 | #define xfs_buf_timer_centisecs xfs_params.xfs_buf_timer.val |
| 119 | #define xfs_buf_age_centisecs xfs_params.xfs_buf_age.val |
| 120 | #define xfs_inherit_nosymlinks xfs_params.inherit_nosym.val |
| 121 | #define xfs_rotorstep xfs_params.rotorstep.val |
Barry Naujok | d3446ea | 2006-06-09 14:54:19 +1000 | [diff] [blame] | 122 | #define xfs_inherit_nodefrag xfs_params.inherit_nodfrg.val |
David Chinner | 2a82b8b | 2007-07-11 11:09:12 +1000 | [diff] [blame] | 123 | #define xfs_fstrm_centisecs xfs_params.fstrm_timer.val |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | |
Nathan Scott | 59c1b08 | 2006-06-09 14:59:13 +1000 | [diff] [blame] | 125 | #define current_cpu() (raw_smp_processor_id()) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | #define current_pid() (current->pid) |
| 127 | #define current_fsuid(cred) (current->fsuid) |
| 128 | #define current_fsgid(cred) (current->fsgid) |
Nathan Scott | 59c1b08 | 2006-06-09 14:59:13 +1000 | [diff] [blame] | 129 | #define current_test_flags(f) (current->flags & (f)) |
Nathan Scott | 59c1b08 | 2006-06-09 14:59:13 +1000 | [diff] [blame] | 130 | #define current_set_flags_nested(sp, f) \ |
| 131 | (*(sp) = current->flags, current->flags |= (f)) |
| 132 | #define current_clear_flags_nested(sp, f) \ |
| 133 | (*(sp) = current->flags, current->flags &= ~(f)) |
| 134 | #define current_restore_flags_nested(sp, f) \ |
| 135 | (current->flags = ((current->flags & ~(f)) | (*(sp) & (f)))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | |
Eric Sandeen | 007c61c | 2007-10-11 17:43:56 +1000 | [diff] [blame] | 137 | #define spinlock_destroy(lock) |
| 138 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | #define NBBY 8 /* number of bits per byte */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | |
| 141 | /* |
| 142 | * Size of block device i/o is parameterized here. |
| 143 | * Currently the system supports page-sized i/o. |
| 144 | */ |
Tim Shimmin | e6a4b37 | 2007-11-23 16:30:42 +1100 | [diff] [blame] | 145 | #define BLKDEV_IOSHIFT PAGE_CACHE_SHIFT |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | #define BLKDEV_IOSIZE (1<<BLKDEV_IOSHIFT) |
| 147 | /* number of BB's per block device block */ |
| 148 | #define BLKDEV_BB BTOBB(BLKDEV_IOSIZE) |
| 149 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 150 | #define ENOATTR ENODATA /* Attribute not found */ |
Nathan Scott | da2f4d6 | 2006-06-20 13:01:38 +1000 | [diff] [blame] | 151 | #define EWRONGFS EINVAL /* Mount with wrong filesystem type */ |
| 152 | #define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | |
| 154 | #define SYNCHRONIZE() barrier() |
| 155 | #define __return_address __builtin_return_address(0) |
| 156 | |
| 157 | /* |
| 158 | * IRIX (BSD) quotactl makes use of separate commands for user/group, |
| 159 | * whereas on Linux the syscall encodes this information into the cmd |
| 160 | * field (see the QCMD macro in quota.h). These macros help keep the |
| 161 | * code portable - they are not visible from the syscall interface. |
| 162 | */ |
Nathan Scott | c8ad20f | 2005-06-21 15:38:48 +1000 | [diff] [blame] | 163 | #define Q_XSETGQLIM XQM_CMD(8) /* set groups disk limits */ |
| 164 | #define Q_XGETGQUOTA XQM_CMD(9) /* get groups disk limits */ |
| 165 | #define Q_XSETPQLIM XQM_CMD(10) /* set projects disk limits */ |
| 166 | #define Q_XGETPQUOTA XQM_CMD(11) /* get projects disk limits */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 167 | |
Nathan Scott | 6b3f6b5 | 2005-11-02 15:08:25 +1100 | [diff] [blame] | 168 | #define dfltprid 0 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 169 | #define MAXPATHLEN 1024 |
| 170 | |
| 171 | #define MIN(a,b) (min(a,b)) |
| 172 | #define MAX(a,b) (max(a,b)) |
| 173 | #define howmany(x, y) (((x)+((y)-1))/(y)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 174 | |
Nathan Scott | cde410a | 2005-09-05 11:47:01 +1000 | [diff] [blame] | 175 | /* |
| 176 | * Various platform dependent calls that don't fit anywhere else |
| 177 | */ |
Nathan Scott | 380b5dc | 2005-11-02 11:43:18 +1100 | [diff] [blame] | 178 | #define xfs_sort(a,n,s,fn) sort(a,n,s,fn,NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | #define xfs_stack_trace() dump_stack() |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | #define xfs_itruncate_data(ip, off) \ |
Nathan Scott | ec86dc0 | 2006-03-17 17:25:36 +1100 | [diff] [blame] | 181 | (-vmtruncate(vn_to_inode(XFS_ITOV(ip)), (off))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | |
| 183 | |
| 184 | /* Move the kernel do_div definition off to one side */ |
| 185 | |
| 186 | #if defined __i386__ |
| 187 | /* For ia32 we need to pull some tricks to get past various versions |
| 188 | * of the compiler which do not like us using do_div in the middle |
| 189 | * of large functions. |
| 190 | */ |
| 191 | static inline __u32 xfs_do_div(void *a, __u32 b, int n) |
| 192 | { |
| 193 | __u32 mod; |
| 194 | |
| 195 | switch (n) { |
| 196 | case 4: |
| 197 | mod = *(__u32 *)a % b; |
| 198 | *(__u32 *)a = *(__u32 *)a / b; |
| 199 | return mod; |
| 200 | case 8: |
| 201 | { |
| 202 | unsigned long __upper, __low, __high, __mod; |
| 203 | __u64 c = *(__u64 *)a; |
| 204 | __upper = __high = c >> 32; |
| 205 | __low = c; |
| 206 | if (__high) { |
| 207 | __upper = __high % (b); |
| 208 | __high = __high / (b); |
| 209 | } |
| 210 | asm("divl %2":"=a" (__low), "=d" (__mod):"rm" (b), "0" (__low), "1" (__upper)); |
| 211 | asm("":"=A" (c):"a" (__low),"d" (__high)); |
| 212 | *(__u64 *)a = c; |
| 213 | return __mod; |
| 214 | } |
| 215 | } |
| 216 | |
| 217 | /* NOTREACHED */ |
| 218 | return 0; |
| 219 | } |
| 220 | |
| 221 | /* Side effect free 64 bit mod operation */ |
| 222 | static inline __u32 xfs_do_mod(void *a, __u32 b, int n) |
| 223 | { |
| 224 | switch (n) { |
| 225 | case 4: |
| 226 | return *(__u32 *)a % b; |
| 227 | case 8: |
| 228 | { |
| 229 | unsigned long __upper, __low, __high, __mod; |
| 230 | __u64 c = *(__u64 *)a; |
| 231 | __upper = __high = c >> 32; |
| 232 | __low = c; |
| 233 | if (__high) { |
| 234 | __upper = __high % (b); |
| 235 | __high = __high / (b); |
| 236 | } |
| 237 | asm("divl %2":"=a" (__low), "=d" (__mod):"rm" (b), "0" (__low), "1" (__upper)); |
| 238 | asm("":"=A" (c):"a" (__low),"d" (__high)); |
| 239 | return __mod; |
| 240 | } |
| 241 | } |
| 242 | |
| 243 | /* NOTREACHED */ |
| 244 | return 0; |
| 245 | } |
| 246 | #else |
| 247 | static inline __u32 xfs_do_div(void *a, __u32 b, int n) |
| 248 | { |
| 249 | __u32 mod; |
| 250 | |
| 251 | switch (n) { |
| 252 | case 4: |
| 253 | mod = *(__u32 *)a % b; |
| 254 | *(__u32 *)a = *(__u32 *)a / b; |
| 255 | return mod; |
| 256 | case 8: |
| 257 | mod = do_div(*(__u64 *)a, b); |
| 258 | return mod; |
| 259 | } |
| 260 | |
| 261 | /* NOTREACHED */ |
| 262 | return 0; |
| 263 | } |
| 264 | |
| 265 | /* Side effect free 64 bit mod operation */ |
| 266 | static inline __u32 xfs_do_mod(void *a, __u32 b, int n) |
| 267 | { |
| 268 | switch (n) { |
| 269 | case 4: |
| 270 | return *(__u32 *)a % b; |
| 271 | case 8: |
| 272 | { |
| 273 | __u64 c = *(__u64 *)a; |
| 274 | return do_div(c, b); |
| 275 | } |
| 276 | } |
| 277 | |
| 278 | /* NOTREACHED */ |
| 279 | return 0; |
| 280 | } |
| 281 | #endif |
| 282 | |
| 283 | #undef do_div |
| 284 | #define do_div(a, b) xfs_do_div(&(a), (b), sizeof(a)) |
| 285 | #define do_mod(a, b) xfs_do_mod(&(a), (b), sizeof(a)) |
| 286 | |
| 287 | static inline __uint64_t roundup_64(__uint64_t x, __uint32_t y) |
| 288 | { |
| 289 | x += y - 1; |
| 290 | do_div(x, y); |
| 291 | return(x * y); |
| 292 | } |
| 293 | |
Nathan Scott | 68c3271 | 2006-09-28 11:03:53 +1000 | [diff] [blame] | 294 | static inline __uint64_t howmany_64(__uint64_t x, __uint32_t y) |
| 295 | { |
| 296 | x += y - 1; |
| 297 | do_div(x, y); |
| 298 | return x; |
| 299 | } |
| 300 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 301 | #endif /* __XFS_LINUX__ */ |