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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Copyright (c) 2000-2004 Silicon Graphics, Inc. All Rights Reserved.
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of version 2 of the GNU General Public License as
6 * published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it would be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
11 *
12 * Further, this software is distributed without any warranty that it is
13 * free of the rightful claim of any third person regarding infringement
14 * or the like. Any license provided herein, whether implied or
15 * otherwise, applies only to this software file. Patent licenses, if
16 * any, provided herein do not apply to combinations of this program with
17 * other software, or any other product whatsoever.
18 *
19 * You should have received a copy of the GNU General Public License along
20 * with this program; if not, write the Free Software Foundation, Inc., 59
21 * Temple Place - Suite 330, Boston MA 02111-1307, USA.
22 *
23 * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
24 * Mountain View, CA 94043, or:
25 *
26 * http://www.sgi.com
27 *
28 * For further information regarding this notice, see:
29 *
30 * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
31 */
32#ifndef __XFS_LINUX__
33#define __XFS_LINUX__
34
35#include <linux/types.h>
36#include <linux/config.h>
37
38/*
39 * Some types are conditional depending on the target system.
40 * XFS_BIG_BLKNOS needs block layer disk addresses to be 64 bits.
41 * XFS_BIG_INUMS needs the VFS inode number to be 64 bits, as well
42 * as requiring XFS_BIG_BLKNOS to be set.
43 */
44#if defined(CONFIG_LBD) || (BITS_PER_LONG == 64)
45# define XFS_BIG_BLKNOS 1
46# if BITS_PER_LONG == 64
47# define XFS_BIG_INUMS 1
48# else
49# define XFS_BIG_INUMS 0
50# endif
51#else
52# define XFS_BIG_BLKNOS 0
53# define XFS_BIG_INUMS 0
54#endif
55
56#include <xfs_types.h>
57#include <xfs_arch.h>
58
59#include <kmem.h>
60#include <mrlock.h>
61#include <spin.h>
62#include <sv.h>
63#include <mutex.h>
64#include <sema.h>
65#include <time.h>
66
Linus Torvalds1da177e2005-04-16 15:20:36 -070067#include <support/ktrace.h>
68#include <support/debug.h>
69#include <support/move.h>
70#include <support/uuid.h>
71
72#include <linux/mm.h>
73#include <linux/kernel.h>
74#include <linux/blkdev.h>
75#include <linux/slab.h>
76#include <linux/module.h>
77#include <linux/file.h>
78#include <linux/swap.h>
79#include <linux/errno.h>
80#include <linux/sched.h>
81#include <linux/bitops.h>
82#include <linux/major.h>
83#include <linux/pagemap.h>
84#include <linux/vfs.h>
85#include <linux/seq_file.h>
86#include <linux/init.h>
87#include <linux/list.h>
88#include <linux/proc_fs.h>
89#include <linux/version.h>
90#include <linux/sort.h>
91
92#include <asm/page.h>
93#include <asm/div64.h>
94#include <asm/param.h>
95#include <asm/uaccess.h>
96#include <asm/byteorder.h>
97#include <asm/unaligned.h>
98
99#include <xfs_behavior.h>
100#include <xfs_vfs.h>
101#include <xfs_cred.h>
102#include <xfs_vnode.h>
103#include <xfs_stats.h>
104#include <xfs_sysctl.h>
105#include <xfs_iops.h>
Christoph Hellwig0829c362005-09-02 16:58:49 +1000106#include <xfs_aops.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107#include <xfs_super.h>
108#include <xfs_globals.h>
109#include <xfs_fs_subr.h>
110#include <xfs_lrw.h>
111#include <xfs_buf.h>
112
113/*
114 * Feature macros (disable/enable)
115 */
116#undef HAVE_REFCACHE /* reference cache not needed for NFS in 2.6 */
117#define HAVE_SENDFILE /* sendfile(2) exists in 2.6, but not in 2.4 */
118
119/*
120 * State flag for unwritten extent buffers.
121 *
122 * We need to be able to distinguish between these and delayed
123 * allocate buffers within XFS. The generic IO path code does
124 * not need to distinguish - we use the BH_Delay flag for both
125 * delalloc and these ondisk-uninitialised buffers.
126 */
127BUFFER_FNS(PrivateStart, unwritten);
128static inline void set_buffer_unwritten_io(struct buffer_head *bh)
129{
130 bh->b_end_io = linvfs_unwritten_done;
131}
132
133#define restricted_chown xfs_params.restrict_chown.val
134#define irix_sgid_inherit xfs_params.sgid_inherit.val
135#define irix_symlink_mode xfs_params.symlink_mode.val
136#define xfs_panic_mask xfs_params.panic_mask.val
137#define xfs_error_level xfs_params.error_level.val
138#define xfs_syncd_centisecs xfs_params.syncd_timer.val
139#define xfs_stats_clear xfs_params.stats_clear.val
140#define xfs_inherit_sync xfs_params.inherit_sync.val
141#define xfs_inherit_nodump xfs_params.inherit_nodump.val
142#define xfs_inherit_noatime xfs_params.inherit_noatim.val
143#define xfs_buf_timer_centisecs xfs_params.xfs_buf_timer.val
144#define xfs_buf_age_centisecs xfs_params.xfs_buf_age.val
145#define xfs_inherit_nosymlinks xfs_params.inherit_nosym.val
146#define xfs_rotorstep xfs_params.rotorstep.val
147
Ingo Molnar39c715b2005-06-21 17:14:34 -0700148#ifndef raw_smp_processor_id
149#define raw_smp_processor_id() smp_processor_id()
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150#endif
Ingo Molnar39c715b2005-06-21 17:14:34 -0700151#define current_cpu() raw_smp_processor_id()
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152#define current_pid() (current->pid)
153#define current_fsuid(cred) (current->fsuid)
154#define current_fsgid(cred) (current->fsgid)
155
156#define NBPP PAGE_SIZE
157#define DPPSHFT (PAGE_SHIFT - 9)
158#define NDPP (1 << (PAGE_SHIFT - 9))
159#define dtop(DD) (((DD) + NDPP - 1) >> DPPSHFT)
160#define dtopt(DD) ((DD) >> DPPSHFT)
161#define dpoff(DD) ((DD) & (NDPP-1))
162
163#define NBBY 8 /* number of bits per byte */
164#define NBPC PAGE_SIZE /* Number of bytes per click */
165#define BPCSHIFT PAGE_SHIFT /* LOG2(NBPC) if exact */
166
167/*
168 * Size of block device i/o is parameterized here.
169 * Currently the system supports page-sized i/o.
170 */
171#define BLKDEV_IOSHIFT BPCSHIFT
172#define BLKDEV_IOSIZE (1<<BLKDEV_IOSHIFT)
173/* number of BB's per block device block */
174#define BLKDEV_BB BTOBB(BLKDEV_IOSIZE)
175
176/* bytes to clicks */
177#define btoc(x) (((__psunsigned_t)(x)+(NBPC-1))>>BPCSHIFT)
178#define btoct(x) ((__psunsigned_t)(x)>>BPCSHIFT)
179#define btoc64(x) (((__uint64_t)(x)+(NBPC-1))>>BPCSHIFT)
180#define btoct64(x) ((__uint64_t)(x)>>BPCSHIFT)
181#define io_btoc(x) (((__psunsigned_t)(x)+(IO_NBPC-1))>>IO_BPCSHIFT)
182#define io_btoct(x) ((__psunsigned_t)(x)>>IO_BPCSHIFT)
183
184/* off_t bytes to clicks */
185#define offtoc(x) (((__uint64_t)(x)+(NBPC-1))>>BPCSHIFT)
186#define offtoct(x) ((xfs_off_t)(x)>>BPCSHIFT)
187
188/* clicks to off_t bytes */
189#define ctooff(x) ((xfs_off_t)(x)<<BPCSHIFT)
190
191/* clicks to bytes */
192#define ctob(x) ((__psunsigned_t)(x)<<BPCSHIFT)
193#define btoct(x) ((__psunsigned_t)(x)>>BPCSHIFT)
194#define ctob64(x) ((__uint64_t)(x)<<BPCSHIFT)
195#define io_ctob(x) ((__psunsigned_t)(x)<<IO_BPCSHIFT)
196
197/* bytes to clicks */
198#define btoc(x) (((__psunsigned_t)(x)+(NBPC-1))>>BPCSHIFT)
199
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200#ifndef ENOATTR
201#define ENOATTR ENODATA /* Attribute not found */
202#endif
203
204/* Note: EWRONGFS never visible outside the kernel */
205#define EWRONGFS EINVAL /* Mount with wrong filesystem type */
206
207/*
208 * XXX EFSCORRUPTED needs a real value in errno.h. asm-i386/errno.h won't
209 * return codes out of its known range in errno.
210 * XXX Also note: needs to be < 1000 and fairly unique on Linux (mustn't
211 * conflict with any code we use already or any code a driver may use)
212 * XXX Some options (currently we do #2):
213 * 1/ New error code ["Filesystem is corrupted", _after_ glibc updated]
214 * 2/ 990 ["Unknown error 990"]
215 * 3/ EUCLEAN ["Structure needs cleaning"]
216 * 4/ Convert EFSCORRUPTED to EIO [just prior to return into userspace]
217 */
218#define EFSCORRUPTED 990 /* Filesystem is corrupted */
219
220#define SYNCHRONIZE() barrier()
221#define __return_address __builtin_return_address(0)
222
223/*
224 * IRIX (BSD) quotactl makes use of separate commands for user/group,
225 * whereas on Linux the syscall encodes this information into the cmd
226 * field (see the QCMD macro in quota.h). These macros help keep the
227 * code portable - they are not visible from the syscall interface.
228 */
Nathan Scottc8ad20f2005-06-21 15:38:48 +1000229#define Q_XSETGQLIM XQM_CMD(8) /* set groups disk limits */
230#define Q_XGETGQUOTA XQM_CMD(9) /* get groups disk limits */
231#define Q_XSETPQLIM XQM_CMD(10) /* set projects disk limits */
232#define Q_XGETPQUOTA XQM_CMD(11) /* get projects disk limits */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233
234/* IRIX uses a dynamic sizing algorithm (ndquot = 200 + numprocs*2) */
235/* we may well need to fine-tune this if it ever becomes an issue. */
236#define DQUOT_MAX_HEURISTIC 1024 /* NR_DQUOTS */
237#define ndquot DQUOT_MAX_HEURISTIC
238
239/* IRIX uses the current size of the name cache to guess a good value */
240/* - this isn't the same but is a good enough starting point for now. */
241#define DQUOT_HASH_HEURISTIC files_stat.nr_files
242
243/* IRIX inodes maintain the project ID also, zero this field on Linux */
244#define DEFAULT_PROJID 0
245#define dfltprid DEFAULT_PROJID
246
247#define MAXPATHLEN 1024
248
249#define MIN(a,b) (min(a,b))
250#define MAX(a,b) (max(a,b))
251#define howmany(x, y) (((x)+((y)-1))/(y))
252#define roundup(x, y) ((((x)+((y)-1))/(y))*(y))
253
Nathan Scottcde410a2005-09-05 11:47:01 +1000254/*
255 * Various platform dependent calls that don't fit anywhere else
256 */
Nathan Scott380b5dc2005-11-02 11:43:18 +1100257#define xfs_sort(a,n,s,fn) sort(a,n,s,fn,NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258#define xfs_stack_trace() dump_stack()
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259#define xfs_itruncate_data(ip, off) \
260 (-vmtruncate(LINVFS_GET_IP(XFS_ITOV(ip)), (off)))
Nathan Scottcde410a2005-09-05 11:47:01 +1000261#define xfs_statvfs_fsid(statp, mp) \
262 ({ u64 id = huge_encode_dev((mp)->m_dev); \
263 __kernel_fsid_t *fsid = &(statp)->f_fsid; \
264 (fsid->val[0] = (u32)id, fsid->val[1] = (u32)(id >> 32)); })
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265
266
267/* Move the kernel do_div definition off to one side */
268
269#if defined __i386__
270/* For ia32 we need to pull some tricks to get past various versions
271 * of the compiler which do not like us using do_div in the middle
272 * of large functions.
273 */
274static inline __u32 xfs_do_div(void *a, __u32 b, int n)
275{
276 __u32 mod;
277
278 switch (n) {
279 case 4:
280 mod = *(__u32 *)a % b;
281 *(__u32 *)a = *(__u32 *)a / b;
282 return mod;
283 case 8:
284 {
285 unsigned long __upper, __low, __high, __mod;
286 __u64 c = *(__u64 *)a;
287 __upper = __high = c >> 32;
288 __low = c;
289 if (__high) {
290 __upper = __high % (b);
291 __high = __high / (b);
292 }
293 asm("divl %2":"=a" (__low), "=d" (__mod):"rm" (b), "0" (__low), "1" (__upper));
294 asm("":"=A" (c):"a" (__low),"d" (__high));
295 *(__u64 *)a = c;
296 return __mod;
297 }
298 }
299
300 /* NOTREACHED */
301 return 0;
302}
303
304/* Side effect free 64 bit mod operation */
305static inline __u32 xfs_do_mod(void *a, __u32 b, int n)
306{
307 switch (n) {
308 case 4:
309 return *(__u32 *)a % b;
310 case 8:
311 {
312 unsigned long __upper, __low, __high, __mod;
313 __u64 c = *(__u64 *)a;
314 __upper = __high = c >> 32;
315 __low = c;
316 if (__high) {
317 __upper = __high % (b);
318 __high = __high / (b);
319 }
320 asm("divl %2":"=a" (__low), "=d" (__mod):"rm" (b), "0" (__low), "1" (__upper));
321 asm("":"=A" (c):"a" (__low),"d" (__high));
322 return __mod;
323 }
324 }
325
326 /* NOTREACHED */
327 return 0;
328}
329#else
330static inline __u32 xfs_do_div(void *a, __u32 b, int n)
331{
332 __u32 mod;
333
334 switch (n) {
335 case 4:
336 mod = *(__u32 *)a % b;
337 *(__u32 *)a = *(__u32 *)a / b;
338 return mod;
339 case 8:
340 mod = do_div(*(__u64 *)a, b);
341 return mod;
342 }
343
344 /* NOTREACHED */
345 return 0;
346}
347
348/* Side effect free 64 bit mod operation */
349static inline __u32 xfs_do_mod(void *a, __u32 b, int n)
350{
351 switch (n) {
352 case 4:
353 return *(__u32 *)a % b;
354 case 8:
355 {
356 __u64 c = *(__u64 *)a;
357 return do_div(c, b);
358 }
359 }
360
361 /* NOTREACHED */
362 return 0;
363}
364#endif
365
366#undef do_div
367#define do_div(a, b) xfs_do_div(&(a), (b), sizeof(a))
368#define do_mod(a, b) xfs_do_mod(&(a), (b), sizeof(a))
369
370static inline __uint64_t roundup_64(__uint64_t x, __uint32_t y)
371{
372 x += y - 1;
373 do_div(x, y);
374 return(x * y);
375}
376
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377#endif /* __XFS_LINUX__ */