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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Nathan Scott7b718762005-11-02 14:58:39 +11002 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
3 * All Rights Reserved.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 *
Nathan Scott7b718762005-11-02 14:58:39 +11005 * 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 Torvalds1da177e2005-04-16 15:20:36 -07007 * published by the Free Software Foundation.
8 *
Nathan Scott7b718762005-11-02 14:58:39 +11009 * 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 Torvalds1da177e2005-04-16 15:20:36 -070013 *
Nathan Scott7b718762005-11-02 14:58:39 +110014 * 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 Torvalds1da177e2005-04-16 15:20:36 -070017 */
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 Torvalds1da177e2005-04-16 15:20:36 -070053#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 Torvalds1da177e2005-04-16 15:20:36 -070075#include <linux/sort.h>
David Chinnere8234a62006-03-14 13:23:52 +110076#include <linux/cpu.h>
77#include <linux/notifier.h>
David Chinner01e1b692006-03-14 13:29:16 +110078#include <linux/delay.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070079
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 Hellwig0829c362005-09-02 16:58:49 +100094#include <xfs_aops.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070095#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 Scott1b895842006-03-31 13:08:59 +1000106#define HAVE_SPLICE /* a splice(2) exists in 2.6, but not in 2.4 */
Nathan Scottd2c32ed2006-03-14 13:20:13 +1100107#ifdef CONFIG_SMP
David Chinner8d280b92006-03-14 13:13:09 +1100108#define HAVE_PERCPU_SB /* per cpu superblock counters are a 2.6 feature */
109#else
110#undef HAVE_PERCPU_SB /* per cpu superblock counters are a 2.6 feature */
111#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112
113/*
114 * State flag for unwritten extent buffers.
115 *
116 * We need to be able to distinguish between these and delayed
117 * allocate buffers within XFS. The generic IO path code does
118 * not need to distinguish - we use the BH_Delay flag for both
119 * delalloc and these ondisk-uninitialised buffers.
120 */
121BUFFER_FNS(PrivateStart, unwritten);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122
123#define restricted_chown xfs_params.restrict_chown.val
124#define irix_sgid_inherit xfs_params.sgid_inherit.val
125#define irix_symlink_mode xfs_params.symlink_mode.val
126#define xfs_panic_mask xfs_params.panic_mask.val
127#define xfs_error_level xfs_params.error_level.val
128#define xfs_syncd_centisecs xfs_params.syncd_timer.val
129#define xfs_stats_clear xfs_params.stats_clear.val
130#define xfs_inherit_sync xfs_params.inherit_sync.val
131#define xfs_inherit_nodump xfs_params.inherit_nodump.val
132#define xfs_inherit_noatime xfs_params.inherit_noatim.val
133#define xfs_buf_timer_centisecs xfs_params.xfs_buf_timer.val
134#define xfs_buf_age_centisecs xfs_params.xfs_buf_age.val
135#define xfs_inherit_nosymlinks xfs_params.inherit_nosym.val
136#define xfs_rotorstep xfs_params.rotorstep.val
137
Ingo Molnar39c715b2005-06-21 17:14:34 -0700138#ifndef raw_smp_processor_id
139#define raw_smp_processor_id() smp_processor_id()
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140#endif
Ingo Molnar39c715b2005-06-21 17:14:34 -0700141#define current_cpu() raw_smp_processor_id()
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142#define current_pid() (current->pid)
143#define current_fsuid(cred) (current->fsuid)
144#define current_fsgid(cred) (current->fsgid)
145
146#define NBPP PAGE_SIZE
147#define DPPSHFT (PAGE_SHIFT - 9)
148#define NDPP (1 << (PAGE_SHIFT - 9))
149#define dtop(DD) (((DD) + NDPP - 1) >> DPPSHFT)
150#define dtopt(DD) ((DD) >> DPPSHFT)
151#define dpoff(DD) ((DD) & (NDPP-1))
152
153#define NBBY 8 /* number of bits per byte */
154#define NBPC PAGE_SIZE /* Number of bytes per click */
155#define BPCSHIFT PAGE_SHIFT /* LOG2(NBPC) if exact */
156
157/*
158 * Size of block device i/o is parameterized here.
159 * Currently the system supports page-sized i/o.
160 */
161#define BLKDEV_IOSHIFT BPCSHIFT
162#define BLKDEV_IOSIZE (1<<BLKDEV_IOSHIFT)
163/* number of BB's per block device block */
164#define BLKDEV_BB BTOBB(BLKDEV_IOSIZE)
165
166/* bytes to clicks */
167#define btoc(x) (((__psunsigned_t)(x)+(NBPC-1))>>BPCSHIFT)
168#define btoct(x) ((__psunsigned_t)(x)>>BPCSHIFT)
169#define btoc64(x) (((__uint64_t)(x)+(NBPC-1))>>BPCSHIFT)
170#define btoct64(x) ((__uint64_t)(x)>>BPCSHIFT)
171#define io_btoc(x) (((__psunsigned_t)(x)+(IO_NBPC-1))>>IO_BPCSHIFT)
172#define io_btoct(x) ((__psunsigned_t)(x)>>IO_BPCSHIFT)
173
174/* off_t bytes to clicks */
175#define offtoc(x) (((__uint64_t)(x)+(NBPC-1))>>BPCSHIFT)
176#define offtoct(x) ((xfs_off_t)(x)>>BPCSHIFT)
177
178/* clicks to off_t bytes */
179#define ctooff(x) ((xfs_off_t)(x)<<BPCSHIFT)
180
181/* clicks to bytes */
182#define ctob(x) ((__psunsigned_t)(x)<<BPCSHIFT)
183#define btoct(x) ((__psunsigned_t)(x)>>BPCSHIFT)
184#define ctob64(x) ((__uint64_t)(x)<<BPCSHIFT)
185#define io_ctob(x) ((__psunsigned_t)(x)<<IO_BPCSHIFT)
186
187/* bytes to clicks */
188#define btoc(x) (((__psunsigned_t)(x)+(NBPC-1))>>BPCSHIFT)
189
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190#ifndef ENOATTR
191#define ENOATTR ENODATA /* Attribute not found */
192#endif
193
194/* Note: EWRONGFS never visible outside the kernel */
195#define EWRONGFS EINVAL /* Mount with wrong filesystem type */
196
197/*
198 * XXX EFSCORRUPTED needs a real value in errno.h. asm-i386/errno.h won't
199 * return codes out of its known range in errno.
200 * XXX Also note: needs to be < 1000 and fairly unique on Linux (mustn't
201 * conflict with any code we use already or any code a driver may use)
202 * XXX Some options (currently we do #2):
203 * 1/ New error code ["Filesystem is corrupted", _after_ glibc updated]
204 * 2/ 990 ["Unknown error 990"]
205 * 3/ EUCLEAN ["Structure needs cleaning"]
206 * 4/ Convert EFSCORRUPTED to EIO [just prior to return into userspace]
207 */
208#define EFSCORRUPTED 990 /* Filesystem is corrupted */
209
210#define SYNCHRONIZE() barrier()
211#define __return_address __builtin_return_address(0)
212
213/*
214 * IRIX (BSD) quotactl makes use of separate commands for user/group,
215 * whereas on Linux the syscall encodes this information into the cmd
216 * field (see the QCMD macro in quota.h). These macros help keep the
217 * code portable - they are not visible from the syscall interface.
218 */
Nathan Scottc8ad20f2005-06-21 15:38:48 +1000219#define Q_XSETGQLIM XQM_CMD(8) /* set groups disk limits */
220#define Q_XGETGQUOTA XQM_CMD(9) /* get groups disk limits */
221#define Q_XSETPQLIM XQM_CMD(10) /* set projects disk limits */
222#define Q_XGETPQUOTA XQM_CMD(11) /* get projects disk limits */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223
Nathan Scott6b3f6b52005-11-02 15:08:25 +1100224#define dfltprid 0
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225#define MAXPATHLEN 1024
226
227#define MIN(a,b) (min(a,b))
228#define MAX(a,b) (max(a,b))
229#define howmany(x, y) (((x)+((y)-1))/(y))
230#define roundup(x, y) ((((x)+((y)-1))/(y))*(y))
231
Nathan Scottcde410a2005-09-05 11:47:01 +1000232/*
233 * Various platform dependent calls that don't fit anywhere else
234 */
Nathan Scott380b5dc2005-11-02 11:43:18 +1100235#define xfs_sort(a,n,s,fn) sort(a,n,s,fn,NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236#define xfs_stack_trace() dump_stack()
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237#define xfs_itruncate_data(ip, off) \
Nathan Scottec86dc02006-03-17 17:25:36 +1100238 (-vmtruncate(vn_to_inode(XFS_ITOV(ip)), (off)))
Nathan Scottcde410a2005-09-05 11:47:01 +1000239#define xfs_statvfs_fsid(statp, mp) \
Nathan Scottce8e9222006-01-11 15:39:08 +1100240 ({ u64 id = huge_encode_dev((mp)->m_ddev_targp->bt_dev); \
Nathan Scottcde410a2005-09-05 11:47:01 +1000241 __kernel_fsid_t *fsid = &(statp)->f_fsid; \
242 (fsid->val[0] = (u32)id, fsid->val[1] = (u32)(id >> 32)); })
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243
244
245/* Move the kernel do_div definition off to one side */
246
247#if defined __i386__
248/* For ia32 we need to pull some tricks to get past various versions
249 * of the compiler which do not like us using do_div in the middle
250 * of large functions.
251 */
252static inline __u32 xfs_do_div(void *a, __u32 b, int n)
253{
254 __u32 mod;
255
256 switch (n) {
257 case 4:
258 mod = *(__u32 *)a % b;
259 *(__u32 *)a = *(__u32 *)a / b;
260 return mod;
261 case 8:
262 {
263 unsigned long __upper, __low, __high, __mod;
264 __u64 c = *(__u64 *)a;
265 __upper = __high = c >> 32;
266 __low = c;
267 if (__high) {
268 __upper = __high % (b);
269 __high = __high / (b);
270 }
271 asm("divl %2":"=a" (__low), "=d" (__mod):"rm" (b), "0" (__low), "1" (__upper));
272 asm("":"=A" (c):"a" (__low),"d" (__high));
273 *(__u64 *)a = c;
274 return __mod;
275 }
276 }
277
278 /* NOTREACHED */
279 return 0;
280}
281
282/* Side effect free 64 bit mod operation */
283static inline __u32 xfs_do_mod(void *a, __u32 b, int n)
284{
285 switch (n) {
286 case 4:
287 return *(__u32 *)a % b;
288 case 8:
289 {
290 unsigned long __upper, __low, __high, __mod;
291 __u64 c = *(__u64 *)a;
292 __upper = __high = c >> 32;
293 __low = c;
294 if (__high) {
295 __upper = __high % (b);
296 __high = __high / (b);
297 }
298 asm("divl %2":"=a" (__low), "=d" (__mod):"rm" (b), "0" (__low), "1" (__upper));
299 asm("":"=A" (c):"a" (__low),"d" (__high));
300 return __mod;
301 }
302 }
303
304 /* NOTREACHED */
305 return 0;
306}
307#else
308static inline __u32 xfs_do_div(void *a, __u32 b, int n)
309{
310 __u32 mod;
311
312 switch (n) {
313 case 4:
314 mod = *(__u32 *)a % b;
315 *(__u32 *)a = *(__u32 *)a / b;
316 return mod;
317 case 8:
318 mod = do_div(*(__u64 *)a, b);
319 return mod;
320 }
321
322 /* NOTREACHED */
323 return 0;
324}
325
326/* Side effect free 64 bit mod operation */
327static inline __u32 xfs_do_mod(void *a, __u32 b, int n)
328{
329 switch (n) {
330 case 4:
331 return *(__u32 *)a % b;
332 case 8:
333 {
334 __u64 c = *(__u64 *)a;
335 return do_div(c, b);
336 }
337 }
338
339 /* NOTREACHED */
340 return 0;
341}
342#endif
343
344#undef do_div
345#define do_div(a, b) xfs_do_div(&(a), (b), sizeof(a))
346#define do_mod(a, b) xfs_do_mod(&(a), (b), sizeof(a))
347
348static inline __uint64_t roundup_64(__uint64_t x, __uint32_t y)
349{
350 x += y - 1;
351 do_div(x, y);
352 return(x * y);
353}
354
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355#endif /* __XFS_LINUX__ */