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> |
| 22 | #include <linux/config.h> |
| 23 | |
| 24 | /* |
| 25 | * Some types are conditional depending on the target system. |
| 26 | * XFS_BIG_BLKNOS needs block layer disk addresses to be 64 bits. |
| 27 | * XFS_BIG_INUMS needs the VFS inode number to be 64 bits, as well |
| 28 | * as requiring XFS_BIG_BLKNOS to be set. |
| 29 | */ |
| 30 | #if defined(CONFIG_LBD) || (BITS_PER_LONG == 64) |
| 31 | # define XFS_BIG_BLKNOS 1 |
| 32 | # if BITS_PER_LONG == 64 |
| 33 | # define XFS_BIG_INUMS 1 |
| 34 | # else |
| 35 | # define XFS_BIG_INUMS 0 |
| 36 | # endif |
| 37 | #else |
| 38 | # define XFS_BIG_BLKNOS 0 |
| 39 | # define XFS_BIG_INUMS 0 |
| 40 | #endif |
| 41 | |
| 42 | #include <xfs_types.h> |
| 43 | #include <xfs_arch.h> |
| 44 | |
| 45 | #include <kmem.h> |
| 46 | #include <mrlock.h> |
| 47 | #include <spin.h> |
| 48 | #include <sv.h> |
| 49 | #include <mutex.h> |
| 50 | #include <sema.h> |
| 51 | #include <time.h> |
| 52 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | #include <support/ktrace.h> |
| 54 | #include <support/debug.h> |
| 55 | #include <support/move.h> |
| 56 | #include <support/uuid.h> |
| 57 | |
| 58 | #include <linux/mm.h> |
| 59 | #include <linux/kernel.h> |
| 60 | #include <linux/blkdev.h> |
| 61 | #include <linux/slab.h> |
| 62 | #include <linux/module.h> |
| 63 | #include <linux/file.h> |
| 64 | #include <linux/swap.h> |
| 65 | #include <linux/errno.h> |
| 66 | #include <linux/sched.h> |
| 67 | #include <linux/bitops.h> |
| 68 | #include <linux/major.h> |
| 69 | #include <linux/pagemap.h> |
| 70 | #include <linux/vfs.h> |
| 71 | #include <linux/seq_file.h> |
| 72 | #include <linux/init.h> |
| 73 | #include <linux/list.h> |
| 74 | #include <linux/proc_fs.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | #include <linux/sort.h> |
David Chinner | e8234a6 | 2006-03-14 13:23:52 +1100 | [diff] [blame] | 76 | #include <linux/cpu.h> |
| 77 | #include <linux/notifier.h> |
David Chinner | 01e1b69 | 2006-03-14 13:29:16 +1100 | [diff] [blame] | 78 | #include <linux/delay.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | |
| 80 | #include <asm/page.h> |
| 81 | #include <asm/div64.h> |
| 82 | #include <asm/param.h> |
| 83 | #include <asm/uaccess.h> |
| 84 | #include <asm/byteorder.h> |
| 85 | #include <asm/unaligned.h> |
| 86 | |
| 87 | #include <xfs_behavior.h> |
| 88 | #include <xfs_vfs.h> |
| 89 | #include <xfs_cred.h> |
| 90 | #include <xfs_vnode.h> |
| 91 | #include <xfs_stats.h> |
| 92 | #include <xfs_sysctl.h> |
| 93 | #include <xfs_iops.h> |
Christoph Hellwig | 0829c36 | 2005-09-02 16:58:49 +1000 | [diff] [blame] | 94 | #include <xfs_aops.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | #include <xfs_super.h> |
| 96 | #include <xfs_globals.h> |
| 97 | #include <xfs_fs_subr.h> |
| 98 | #include <xfs_lrw.h> |
| 99 | #include <xfs_buf.h> |
| 100 | |
| 101 | /* |
| 102 | * Feature macros (disable/enable) |
| 103 | */ |
| 104 | #undef HAVE_REFCACHE /* reference cache not needed for NFS in 2.6 */ |
| 105 | #define HAVE_SENDFILE /* sendfile(2) exists in 2.6, but not in 2.4 */ |
Nathan Scott | d2c32ed | 2006-03-14 13:20:13 +1100 | [diff] [blame] | 106 | #ifdef CONFIG_SMP |
David Chinner | 8d280b9 | 2006-03-14 13:13:09 +1100 | [diff] [blame] | 107 | #define HAVE_PERCPU_SB /* per cpu superblock counters are a 2.6 feature */ |
| 108 | #else |
| 109 | #undef HAVE_PERCPU_SB /* per cpu superblock counters are a 2.6 feature */ |
| 110 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | |
| 112 | /* |
| 113 | * State flag for unwritten extent buffers. |
| 114 | * |
| 115 | * We need to be able to distinguish between these and delayed |
| 116 | * allocate buffers within XFS. The generic IO path code does |
| 117 | * not need to distinguish - we use the BH_Delay flag for both |
| 118 | * delalloc and these ondisk-uninitialised buffers. |
| 119 | */ |
| 120 | BUFFER_FNS(PrivateStart, unwritten); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | |
| 122 | #define restricted_chown xfs_params.restrict_chown.val |
| 123 | #define irix_sgid_inherit xfs_params.sgid_inherit.val |
| 124 | #define irix_symlink_mode xfs_params.symlink_mode.val |
| 125 | #define xfs_panic_mask xfs_params.panic_mask.val |
| 126 | #define xfs_error_level xfs_params.error_level.val |
| 127 | #define xfs_syncd_centisecs xfs_params.syncd_timer.val |
| 128 | #define xfs_stats_clear xfs_params.stats_clear.val |
| 129 | #define xfs_inherit_sync xfs_params.inherit_sync.val |
| 130 | #define xfs_inherit_nodump xfs_params.inherit_nodump.val |
| 131 | #define xfs_inherit_noatime xfs_params.inherit_noatim.val |
| 132 | #define xfs_buf_timer_centisecs xfs_params.xfs_buf_timer.val |
| 133 | #define xfs_buf_age_centisecs xfs_params.xfs_buf_age.val |
| 134 | #define xfs_inherit_nosymlinks xfs_params.inherit_nosym.val |
| 135 | #define xfs_rotorstep xfs_params.rotorstep.val |
| 136 | |
Ingo Molnar | 39c715b | 2005-06-21 17:14:34 -0700 | [diff] [blame] | 137 | #ifndef raw_smp_processor_id |
| 138 | #define raw_smp_processor_id() smp_processor_id() |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | #endif |
Ingo Molnar | 39c715b | 2005-06-21 17:14:34 -0700 | [diff] [blame] | 140 | #define current_cpu() raw_smp_processor_id() |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 141 | #define current_pid() (current->pid) |
| 142 | #define current_fsuid(cred) (current->fsuid) |
| 143 | #define current_fsgid(cred) (current->fsgid) |
| 144 | |
| 145 | #define NBPP PAGE_SIZE |
| 146 | #define DPPSHFT (PAGE_SHIFT - 9) |
| 147 | #define NDPP (1 << (PAGE_SHIFT - 9)) |
| 148 | #define dtop(DD) (((DD) + NDPP - 1) >> DPPSHFT) |
| 149 | #define dtopt(DD) ((DD) >> DPPSHFT) |
| 150 | #define dpoff(DD) ((DD) & (NDPP-1)) |
| 151 | |
| 152 | #define NBBY 8 /* number of bits per byte */ |
| 153 | #define NBPC PAGE_SIZE /* Number of bytes per click */ |
| 154 | #define BPCSHIFT PAGE_SHIFT /* LOG2(NBPC) if exact */ |
| 155 | |
| 156 | /* |
| 157 | * Size of block device i/o is parameterized here. |
| 158 | * Currently the system supports page-sized i/o. |
| 159 | */ |
| 160 | #define BLKDEV_IOSHIFT BPCSHIFT |
| 161 | #define BLKDEV_IOSIZE (1<<BLKDEV_IOSHIFT) |
| 162 | /* number of BB's per block device block */ |
| 163 | #define BLKDEV_BB BTOBB(BLKDEV_IOSIZE) |
| 164 | |
| 165 | /* bytes to clicks */ |
| 166 | #define btoc(x) (((__psunsigned_t)(x)+(NBPC-1))>>BPCSHIFT) |
| 167 | #define btoct(x) ((__psunsigned_t)(x)>>BPCSHIFT) |
| 168 | #define btoc64(x) (((__uint64_t)(x)+(NBPC-1))>>BPCSHIFT) |
| 169 | #define btoct64(x) ((__uint64_t)(x)>>BPCSHIFT) |
| 170 | #define io_btoc(x) (((__psunsigned_t)(x)+(IO_NBPC-1))>>IO_BPCSHIFT) |
| 171 | #define io_btoct(x) ((__psunsigned_t)(x)>>IO_BPCSHIFT) |
| 172 | |
| 173 | /* off_t bytes to clicks */ |
| 174 | #define offtoc(x) (((__uint64_t)(x)+(NBPC-1))>>BPCSHIFT) |
| 175 | #define offtoct(x) ((xfs_off_t)(x)>>BPCSHIFT) |
| 176 | |
| 177 | /* clicks to off_t bytes */ |
| 178 | #define ctooff(x) ((xfs_off_t)(x)<<BPCSHIFT) |
| 179 | |
| 180 | /* clicks to bytes */ |
| 181 | #define ctob(x) ((__psunsigned_t)(x)<<BPCSHIFT) |
| 182 | #define btoct(x) ((__psunsigned_t)(x)>>BPCSHIFT) |
| 183 | #define ctob64(x) ((__uint64_t)(x)<<BPCSHIFT) |
| 184 | #define io_ctob(x) ((__psunsigned_t)(x)<<IO_BPCSHIFT) |
| 185 | |
| 186 | /* bytes to clicks */ |
| 187 | #define btoc(x) (((__psunsigned_t)(x)+(NBPC-1))>>BPCSHIFT) |
| 188 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | #ifndef ENOATTR |
| 190 | #define ENOATTR ENODATA /* Attribute not found */ |
| 191 | #endif |
| 192 | |
| 193 | /* Note: EWRONGFS never visible outside the kernel */ |
| 194 | #define EWRONGFS EINVAL /* Mount with wrong filesystem type */ |
| 195 | |
| 196 | /* |
| 197 | * XXX EFSCORRUPTED needs a real value in errno.h. asm-i386/errno.h won't |
| 198 | * return codes out of its known range in errno. |
| 199 | * XXX Also note: needs to be < 1000 and fairly unique on Linux (mustn't |
| 200 | * conflict with any code we use already or any code a driver may use) |
| 201 | * XXX Some options (currently we do #2): |
| 202 | * 1/ New error code ["Filesystem is corrupted", _after_ glibc updated] |
| 203 | * 2/ 990 ["Unknown error 990"] |
| 204 | * 3/ EUCLEAN ["Structure needs cleaning"] |
| 205 | * 4/ Convert EFSCORRUPTED to EIO [just prior to return into userspace] |
| 206 | */ |
| 207 | #define EFSCORRUPTED 990 /* Filesystem is corrupted */ |
| 208 | |
| 209 | #define SYNCHRONIZE() barrier() |
| 210 | #define __return_address __builtin_return_address(0) |
| 211 | |
| 212 | /* |
| 213 | * IRIX (BSD) quotactl makes use of separate commands for user/group, |
| 214 | * whereas on Linux the syscall encodes this information into the cmd |
| 215 | * field (see the QCMD macro in quota.h). These macros help keep the |
| 216 | * code portable - they are not visible from the syscall interface. |
| 217 | */ |
Nathan Scott | c8ad20f | 2005-06-21 15:38:48 +1000 | [diff] [blame] | 218 | #define Q_XSETGQLIM XQM_CMD(8) /* set groups disk limits */ |
| 219 | #define Q_XGETGQUOTA XQM_CMD(9) /* get groups disk limits */ |
| 220 | #define Q_XSETPQLIM XQM_CMD(10) /* set projects disk limits */ |
| 221 | #define Q_XGETPQUOTA XQM_CMD(11) /* get projects disk limits */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 222 | |
Nathan Scott | 6b3f6b5 | 2005-11-02 15:08:25 +1100 | [diff] [blame] | 223 | #define dfltprid 0 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 224 | #define MAXPATHLEN 1024 |
| 225 | |
| 226 | #define MIN(a,b) (min(a,b)) |
| 227 | #define MAX(a,b) (max(a,b)) |
| 228 | #define howmany(x, y) (((x)+((y)-1))/(y)) |
| 229 | #define roundup(x, y) ((((x)+((y)-1))/(y))*(y)) |
| 230 | |
Nathan Scott | cde410a | 2005-09-05 11:47:01 +1000 | [diff] [blame] | 231 | /* |
| 232 | * Various platform dependent calls that don't fit anywhere else |
| 233 | */ |
Nathan Scott | 380b5dc | 2005-11-02 11:43:18 +1100 | [diff] [blame] | 234 | #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] | 235 | #define xfs_stack_trace() dump_stack() |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 236 | #define xfs_itruncate_data(ip, off) \ |
Nathan Scott | ec86dc0 | 2006-03-17 17:25:36 +1100 | [diff] [blame] | 237 | (-vmtruncate(vn_to_inode(XFS_ITOV(ip)), (off))) |
Nathan Scott | cde410a | 2005-09-05 11:47:01 +1000 | [diff] [blame] | 238 | #define xfs_statvfs_fsid(statp, mp) \ |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 239 | ({ u64 id = huge_encode_dev((mp)->m_ddev_targp->bt_dev); \ |
Nathan Scott | cde410a | 2005-09-05 11:47:01 +1000 | [diff] [blame] | 240 | __kernel_fsid_t *fsid = &(statp)->f_fsid; \ |
| 241 | (fsid->val[0] = (u32)id, fsid->val[1] = (u32)(id >> 32)); }) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 242 | |
| 243 | |
| 244 | /* Move the kernel do_div definition off to one side */ |
| 245 | |
| 246 | #if defined __i386__ |
| 247 | /* For ia32 we need to pull some tricks to get past various versions |
| 248 | * of the compiler which do not like us using do_div in the middle |
| 249 | * of large functions. |
| 250 | */ |
| 251 | static inline __u32 xfs_do_div(void *a, __u32 b, int n) |
| 252 | { |
| 253 | __u32 mod; |
| 254 | |
| 255 | switch (n) { |
| 256 | case 4: |
| 257 | mod = *(__u32 *)a % b; |
| 258 | *(__u32 *)a = *(__u32 *)a / b; |
| 259 | return mod; |
| 260 | case 8: |
| 261 | { |
| 262 | unsigned long __upper, __low, __high, __mod; |
| 263 | __u64 c = *(__u64 *)a; |
| 264 | __upper = __high = c >> 32; |
| 265 | __low = c; |
| 266 | if (__high) { |
| 267 | __upper = __high % (b); |
| 268 | __high = __high / (b); |
| 269 | } |
| 270 | asm("divl %2":"=a" (__low), "=d" (__mod):"rm" (b), "0" (__low), "1" (__upper)); |
| 271 | asm("":"=A" (c):"a" (__low),"d" (__high)); |
| 272 | *(__u64 *)a = c; |
| 273 | return __mod; |
| 274 | } |
| 275 | } |
| 276 | |
| 277 | /* NOTREACHED */ |
| 278 | return 0; |
| 279 | } |
| 280 | |
| 281 | /* Side effect free 64 bit mod operation */ |
| 282 | static inline __u32 xfs_do_mod(void *a, __u32 b, int n) |
| 283 | { |
| 284 | switch (n) { |
| 285 | case 4: |
| 286 | return *(__u32 *)a % b; |
| 287 | case 8: |
| 288 | { |
| 289 | unsigned long __upper, __low, __high, __mod; |
| 290 | __u64 c = *(__u64 *)a; |
| 291 | __upper = __high = c >> 32; |
| 292 | __low = c; |
| 293 | if (__high) { |
| 294 | __upper = __high % (b); |
| 295 | __high = __high / (b); |
| 296 | } |
| 297 | asm("divl %2":"=a" (__low), "=d" (__mod):"rm" (b), "0" (__low), "1" (__upper)); |
| 298 | asm("":"=A" (c):"a" (__low),"d" (__high)); |
| 299 | return __mod; |
| 300 | } |
| 301 | } |
| 302 | |
| 303 | /* NOTREACHED */ |
| 304 | return 0; |
| 305 | } |
| 306 | #else |
| 307 | static inline __u32 xfs_do_div(void *a, __u32 b, int n) |
| 308 | { |
| 309 | __u32 mod; |
| 310 | |
| 311 | switch (n) { |
| 312 | case 4: |
| 313 | mod = *(__u32 *)a % b; |
| 314 | *(__u32 *)a = *(__u32 *)a / b; |
| 315 | return mod; |
| 316 | case 8: |
| 317 | mod = do_div(*(__u64 *)a, b); |
| 318 | return mod; |
| 319 | } |
| 320 | |
| 321 | /* NOTREACHED */ |
| 322 | return 0; |
| 323 | } |
| 324 | |
| 325 | /* Side effect free 64 bit mod operation */ |
| 326 | static inline __u32 xfs_do_mod(void *a, __u32 b, int n) |
| 327 | { |
| 328 | switch (n) { |
| 329 | case 4: |
| 330 | return *(__u32 *)a % b; |
| 331 | case 8: |
| 332 | { |
| 333 | __u64 c = *(__u64 *)a; |
| 334 | return do_div(c, b); |
| 335 | } |
| 336 | } |
| 337 | |
| 338 | /* NOTREACHED */ |
| 339 | return 0; |
| 340 | } |
| 341 | #endif |
| 342 | |
| 343 | #undef do_div |
| 344 | #define do_div(a, b) xfs_do_div(&(a), (b), sizeof(a)) |
| 345 | #define do_mod(a, b) xfs_do_mod(&(a), (b), sizeof(a)) |
| 346 | |
| 347 | static inline __uint64_t roundup_64(__uint64_t x, __uint32_t y) |
| 348 | { |
| 349 | x += y - 1; |
| 350 | do_div(x, y); |
| 351 | return(x * y); |
| 352 | } |
| 353 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 | #endif /* __XFS_LINUX__ */ |