2 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
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
7 * published by the Free Software Foundation.
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.
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
21 #include <linux/types.h>
22 #include <linux/config.h>
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.
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
35 # define XFS_BIG_INUMS 0
38 # define XFS_BIG_BLKNOS 0
39 # define XFS_BIG_INUMS 0
42 #include <xfs_types.h>
53 #include <support/ktrace.h>
54 #include <support/debug.h>
55 #include <support/move.h>
56 #include <support/uuid.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>
75 #include <linux/sort.h>
76 #include <linux/cpu.h>
77 #include <linux/notifier.h>
78 #include <linux/delay.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>
87 #include <xfs_behavior.h>
90 #include <xfs_vnode.h>
91 #include <xfs_stats.h>
92 #include <xfs_sysctl.h>
95 #include <xfs_super.h>
96 #include <xfs_globals.h>
97 #include <xfs_fs_subr.h>
102 * Feature macros (disable/enable)
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 */
107 #define HAVE_PERCPU_SB /* per cpu superblock counters are a 2.6 feature */
109 #undef HAVE_PERCPU_SB /* per cpu superblock counters are a 2.6 feature */
113 * State flag for unwritten extent buffers.
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.
120 BUFFER_FNS(PrivateStart, unwritten);
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
137 #ifndef raw_smp_processor_id
138 #define raw_smp_processor_id() smp_processor_id()
140 #define current_cpu() raw_smp_processor_id()
141 #define current_pid() (current->pid)
142 #define current_fsuid(cred) (current->fsuid)
143 #define current_fsgid(cred) (current->fsgid)
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))
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 */
157 * Size of block device i/o is parameterized here.
158 * Currently the system supports page-sized i/o.
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)
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)
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)
177 /* clicks to off_t bytes */
178 #define ctooff(x) ((xfs_off_t)(x)<<BPCSHIFT)
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)
186 /* bytes to clicks */
187 #define btoc(x) (((__psunsigned_t)(x)+(NBPC-1))>>BPCSHIFT)
190 #define ENOATTR ENODATA /* Attribute not found */
193 /* Note: EWRONGFS never visible outside the kernel */
194 #define EWRONGFS EINVAL /* Mount with wrong filesystem type */
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]
207 #define EFSCORRUPTED 990 /* Filesystem is corrupted */
209 #define SYNCHRONIZE() barrier()
210 #define __return_address __builtin_return_address(0)
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.
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 */
224 #define MAXPATHLEN 1024
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))
232 * Various platform dependent calls that don't fit anywhere else
234 #define xfs_sort(a,n,s,fn) sort(a,n,s,fn,NULL)
235 #define xfs_stack_trace() dump_stack()
236 #define xfs_itruncate_data(ip, off) \
237 (-vmtruncate(vn_to_inode(XFS_ITOV(ip)), (off)))
238 #define xfs_statvfs_fsid(statp, mp) \
239 ({ u64 id = huge_encode_dev((mp)->m_ddev_targp->bt_dev); \
240 __kernel_fsid_t *fsid = &(statp)->f_fsid; \
241 (fsid->val[0] = (u32)id, fsid->val[1] = (u32)(id >> 32)); })
244 /* Move the kernel do_div definition off to one side */
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.
251 static inline __u32 xfs_do_div(void *a, __u32 b, int n)
257 mod = *(__u32 *)a % b;
258 *(__u32 *)a = *(__u32 *)a / b;
262 unsigned long __upper, __low, __high, __mod;
263 __u64 c = *(__u64 *)a;
264 __upper = __high = c >> 32;
267 __upper = __high % (b);
268 __high = __high / (b);
270 asm("divl %2":"=a" (__low), "=d" (__mod):"rm" (b), "0" (__low), "1" (__upper));
271 asm("":"=A" (c):"a" (__low),"d" (__high));
281 /* Side effect free 64 bit mod operation */
282 static inline __u32 xfs_do_mod(void *a, __u32 b, int n)
286 return *(__u32 *)a % b;
289 unsigned long __upper, __low, __high, __mod;
290 __u64 c = *(__u64 *)a;
291 __upper = __high = c >> 32;
294 __upper = __high % (b);
295 __high = __high / (b);
297 asm("divl %2":"=a" (__low), "=d" (__mod):"rm" (b), "0" (__low), "1" (__upper));
298 asm("":"=A" (c):"a" (__low),"d" (__high));
307 static inline __u32 xfs_do_div(void *a, __u32 b, int n)
313 mod = *(__u32 *)a % b;
314 *(__u32 *)a = *(__u32 *)a / b;
317 mod = do_div(*(__u64 *)a, b);
325 /* Side effect free 64 bit mod operation */
326 static inline __u32 xfs_do_mod(void *a, __u32 b, int n)
330 return *(__u32 *)a % b;
333 __u64 c = *(__u64 *)a;
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))
347 static inline __uint64_t roundup_64(__uint64_t x, __uint32_t y)
354 #endif /* __XFS_LINUX__ */