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>
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.
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
34 # define XFS_BIG_INUMS 0
37 # define XFS_BIG_BLKNOS 0
38 # define XFS_BIG_INUMS 0
41 #include <xfs_types.h>
52 #include <support/ktrace.h>
53 #include <support/debug.h>
54 #include <support/move.h>
55 #include <support/uuid.h>
58 #include <linux/kernel.h>
59 #include <linux/blkdev.h>
60 #include <linux/slab.h>
61 #include <linux/module.h>
62 #include <linux/file.h>
63 #include <linux/swap.h>
64 #include <linux/errno.h>
65 #include <linux/sched.h>
66 #include <linux/bitops.h>
67 #include <linux/major.h>
68 #include <linux/pagemap.h>
69 #include <linux/vfs.h>
70 #include <linux/seq_file.h>
71 #include <linux/init.h>
72 #include <linux/list.h>
73 #include <linux/proc_fs.h>
74 #include <linux/sort.h>
75 #include <linux/cpu.h>
76 #include <linux/notifier.h>
77 #include <linux/delay.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>
86 #include <xfs_behavior.h>
89 #include <xfs_vnode.h>
90 #include <xfs_stats.h>
91 #include <xfs_sysctl.h>
94 #include <xfs_super.h>
95 #include <xfs_globals.h>
96 #include <xfs_fs_subr.h>
101 * Feature macros (disable/enable)
103 #undef HAVE_REFCACHE /* reference cache not needed for NFS in 2.6 */
104 #define HAVE_SENDFILE /* sendfile(2) exists in 2.6, but not in 2.4 */
105 #define HAVE_SPLICE /* a splice(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
136 #define xfs_inherit_nodefrag xfs_params.inherit_nodfrg.val
138 #define current_cpu() (raw_smp_processor_id())
139 #define current_pid() (current->pid)
140 #define current_fsuid(cred) (current->fsuid)
141 #define current_fsgid(cred) (current->fsgid)
142 #define current_test_flags(f) (current->flags & (f))
143 #define current_set_flags_nested(sp, f) \
144 (*(sp) = current->flags, current->flags |= (f))
145 #define current_clear_flags_nested(sp, f) \
146 (*(sp) = current->flags, current->flags &= ~(f))
147 #define current_restore_flags_nested(sp, f) \
148 (current->flags = ((current->flags & ~(f)) | (*(sp) & (f))))
150 #define NBPP PAGE_SIZE
151 #define DPPSHFT (PAGE_SHIFT - 9)
152 #define NDPP (1 << (PAGE_SHIFT - 9))
153 #define dtop(DD) (((DD) + NDPP - 1) >> DPPSHFT)
154 #define dtopt(DD) ((DD) >> DPPSHFT)
155 #define dpoff(DD) ((DD) & (NDPP-1))
157 #define NBBY 8 /* number of bits per byte */
158 #define NBPC PAGE_SIZE /* Number of bytes per click */
159 #define BPCSHIFT PAGE_SHIFT /* LOG2(NBPC) if exact */
162 * Size of block device i/o is parameterized here.
163 * Currently the system supports page-sized i/o.
165 #define BLKDEV_IOSHIFT BPCSHIFT
166 #define BLKDEV_IOSIZE (1<<BLKDEV_IOSHIFT)
167 /* number of BB's per block device block */
168 #define BLKDEV_BB BTOBB(BLKDEV_IOSIZE)
170 /* bytes to clicks */
171 #define btoc(x) (((__psunsigned_t)(x)+(NBPC-1))>>BPCSHIFT)
172 #define btoct(x) ((__psunsigned_t)(x)>>BPCSHIFT)
173 #define btoc64(x) (((__uint64_t)(x)+(NBPC-1))>>BPCSHIFT)
174 #define btoct64(x) ((__uint64_t)(x)>>BPCSHIFT)
175 #define io_btoc(x) (((__psunsigned_t)(x)+(IO_NBPC-1))>>IO_BPCSHIFT)
176 #define io_btoct(x) ((__psunsigned_t)(x)>>IO_BPCSHIFT)
178 /* off_t bytes to clicks */
179 #define offtoc(x) (((__uint64_t)(x)+(NBPC-1))>>BPCSHIFT)
180 #define offtoct(x) ((xfs_off_t)(x)>>BPCSHIFT)
182 /* clicks to off_t bytes */
183 #define ctooff(x) ((xfs_off_t)(x)<<BPCSHIFT)
185 /* clicks to bytes */
186 #define ctob(x) ((__psunsigned_t)(x)<<BPCSHIFT)
187 #define btoct(x) ((__psunsigned_t)(x)>>BPCSHIFT)
188 #define ctob64(x) ((__uint64_t)(x)<<BPCSHIFT)
189 #define io_ctob(x) ((__psunsigned_t)(x)<<IO_BPCSHIFT)
191 /* bytes to clicks */
192 #define btoc(x) (((__psunsigned_t)(x)+(NBPC-1))>>BPCSHIFT)
194 #define ENOATTR ENODATA /* Attribute not found */
195 #define EWRONGFS EINVAL /* Mount with wrong filesystem type */
196 #define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */
198 #define SYNCHRONIZE() barrier()
199 #define __return_address __builtin_return_address(0)
202 * IRIX (BSD) quotactl makes use of separate commands for user/group,
203 * whereas on Linux the syscall encodes this information into the cmd
204 * field (see the QCMD macro in quota.h). These macros help keep the
205 * code portable - they are not visible from the syscall interface.
207 #define Q_XSETGQLIM XQM_CMD(8) /* set groups disk limits */
208 #define Q_XGETGQUOTA XQM_CMD(9) /* get groups disk limits */
209 #define Q_XSETPQLIM XQM_CMD(10) /* set projects disk limits */
210 #define Q_XGETPQUOTA XQM_CMD(11) /* get projects disk limits */
213 #define MAXPATHLEN 1024
215 #define MIN(a,b) (min(a,b))
216 #define MAX(a,b) (max(a,b))
217 #define howmany(x, y) (((x)+((y)-1))/(y))
218 #define roundup(x, y) ((((x)+((y)-1))/(y))*(y))
221 * Various platform dependent calls that don't fit anywhere else
223 #define xfs_sort(a,n,s,fn) sort(a,n,s,fn,NULL)
224 #define xfs_stack_trace() dump_stack()
225 #define xfs_itruncate_data(ip, off) \
226 (-vmtruncate(vn_to_inode(XFS_ITOV(ip)), (off)))
227 #define xfs_statvfs_fsid(statp, mp) \
228 ({ u64 id = huge_encode_dev((mp)->m_ddev_targp->bt_dev); \
229 __kernel_fsid_t *fsid = &(statp)->f_fsid; \
230 (fsid->val[0] = (u32)id, fsid->val[1] = (u32)(id >> 32)); })
233 /* Move the kernel do_div definition off to one side */
236 /* For ia32 we need to pull some tricks to get past various versions
237 * of the compiler which do not like us using do_div in the middle
238 * of large functions.
240 static inline __u32 xfs_do_div(void *a, __u32 b, int n)
246 mod = *(__u32 *)a % b;
247 *(__u32 *)a = *(__u32 *)a / b;
251 unsigned long __upper, __low, __high, __mod;
252 __u64 c = *(__u64 *)a;
253 __upper = __high = c >> 32;
256 __upper = __high % (b);
257 __high = __high / (b);
259 asm("divl %2":"=a" (__low), "=d" (__mod):"rm" (b), "0" (__low), "1" (__upper));
260 asm("":"=A" (c):"a" (__low),"d" (__high));
270 /* Side effect free 64 bit mod operation */
271 static inline __u32 xfs_do_mod(void *a, __u32 b, int n)
275 return *(__u32 *)a % b;
278 unsigned long __upper, __low, __high, __mod;
279 __u64 c = *(__u64 *)a;
280 __upper = __high = c >> 32;
283 __upper = __high % (b);
284 __high = __high / (b);
286 asm("divl %2":"=a" (__low), "=d" (__mod):"rm" (b), "0" (__low), "1" (__upper));
287 asm("":"=A" (c):"a" (__low),"d" (__high));
296 static inline __u32 xfs_do_div(void *a, __u32 b, int n)
302 mod = *(__u32 *)a % b;
303 *(__u32 *)a = *(__u32 *)a / b;
306 mod = do_div(*(__u64 *)a, b);
314 /* Side effect free 64 bit mod operation */
315 static inline __u32 xfs_do_mod(void *a, __u32 b, int n)
319 return *(__u32 *)a % b;
322 __u64 c = *(__u64 *)a;
333 #define do_div(a, b) xfs_do_div(&(a), (b), sizeof(a))
334 #define do_mod(a, b) xfs_do_mod(&(a), (b), sizeof(a))
336 static inline __uint64_t roundup_64(__uint64_t x, __uint32_t y)
343 #endif /* __XFS_LINUX__ */