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/version.h>
76 #include <linux/sort.h>
79 #include <asm/div64.h>
80 #include <asm/param.h>
81 #include <asm/uaccess.h>
82 #include <asm/byteorder.h>
83 #include <asm/unaligned.h>
85 #include <xfs_behavior.h>
88 #include <xfs_vnode.h>
89 #include <xfs_stats.h>
90 #include <xfs_sysctl.h>
93 #include <xfs_super.h>
94 #include <xfs_globals.h>
95 #include <xfs_fs_subr.h>
100 * Feature macros (disable/enable)
102 #undef HAVE_REFCACHE /* reference cache not needed for NFS in 2.6 */
103 #define HAVE_SENDFILE /* sendfile(2) exists in 2.6, but not in 2.4 */
106 * State flag for unwritten extent buffers.
108 * We need to be able to distinguish between these and delayed
109 * allocate buffers within XFS. The generic IO path code does
110 * not need to distinguish - we use the BH_Delay flag for both
111 * delalloc and these ondisk-uninitialised buffers.
113 BUFFER_FNS(PrivateStart, unwritten);
114 static inline void set_buffer_unwritten_io(struct buffer_head *bh)
116 bh->b_end_io = linvfs_unwritten_done;
119 #define restricted_chown xfs_params.restrict_chown.val
120 #define irix_sgid_inherit xfs_params.sgid_inherit.val
121 #define irix_symlink_mode xfs_params.symlink_mode.val
122 #define xfs_panic_mask xfs_params.panic_mask.val
123 #define xfs_error_level xfs_params.error_level.val
124 #define xfs_syncd_centisecs xfs_params.syncd_timer.val
125 #define xfs_stats_clear xfs_params.stats_clear.val
126 #define xfs_inherit_sync xfs_params.inherit_sync.val
127 #define xfs_inherit_nodump xfs_params.inherit_nodump.val
128 #define xfs_inherit_noatime xfs_params.inherit_noatim.val
129 #define xfs_buf_timer_centisecs xfs_params.xfs_buf_timer.val
130 #define xfs_buf_age_centisecs xfs_params.xfs_buf_age.val
131 #define xfs_inherit_nosymlinks xfs_params.inherit_nosym.val
132 #define xfs_rotorstep xfs_params.rotorstep.val
134 #ifndef raw_smp_processor_id
135 #define raw_smp_processor_id() smp_processor_id()
137 #define current_cpu() raw_smp_processor_id()
138 #define current_pid() (current->pid)
139 #define current_fsuid(cred) (current->fsuid)
140 #define current_fsgid(cred) (current->fsgid)
142 #define NBPP PAGE_SIZE
143 #define DPPSHFT (PAGE_SHIFT - 9)
144 #define NDPP (1 << (PAGE_SHIFT - 9))
145 #define dtop(DD) (((DD) + NDPP - 1) >> DPPSHFT)
146 #define dtopt(DD) ((DD) >> DPPSHFT)
147 #define dpoff(DD) ((DD) & (NDPP-1))
149 #define NBBY 8 /* number of bits per byte */
150 #define NBPC PAGE_SIZE /* Number of bytes per click */
151 #define BPCSHIFT PAGE_SHIFT /* LOG2(NBPC) if exact */
154 * Size of block device i/o is parameterized here.
155 * Currently the system supports page-sized i/o.
157 #define BLKDEV_IOSHIFT BPCSHIFT
158 #define BLKDEV_IOSIZE (1<<BLKDEV_IOSHIFT)
159 /* number of BB's per block device block */
160 #define BLKDEV_BB BTOBB(BLKDEV_IOSIZE)
162 /* bytes to clicks */
163 #define btoc(x) (((__psunsigned_t)(x)+(NBPC-1))>>BPCSHIFT)
164 #define btoct(x) ((__psunsigned_t)(x)>>BPCSHIFT)
165 #define btoc64(x) (((__uint64_t)(x)+(NBPC-1))>>BPCSHIFT)
166 #define btoct64(x) ((__uint64_t)(x)>>BPCSHIFT)
167 #define io_btoc(x) (((__psunsigned_t)(x)+(IO_NBPC-1))>>IO_BPCSHIFT)
168 #define io_btoct(x) ((__psunsigned_t)(x)>>IO_BPCSHIFT)
170 /* off_t bytes to clicks */
171 #define offtoc(x) (((__uint64_t)(x)+(NBPC-1))>>BPCSHIFT)
172 #define offtoct(x) ((xfs_off_t)(x)>>BPCSHIFT)
174 /* clicks to off_t bytes */
175 #define ctooff(x) ((xfs_off_t)(x)<<BPCSHIFT)
177 /* clicks to bytes */
178 #define ctob(x) ((__psunsigned_t)(x)<<BPCSHIFT)
179 #define btoct(x) ((__psunsigned_t)(x)>>BPCSHIFT)
180 #define ctob64(x) ((__uint64_t)(x)<<BPCSHIFT)
181 #define io_ctob(x) ((__psunsigned_t)(x)<<IO_BPCSHIFT)
183 /* bytes to clicks */
184 #define btoc(x) (((__psunsigned_t)(x)+(NBPC-1))>>BPCSHIFT)
187 #define ENOATTR ENODATA /* Attribute not found */
190 /* Note: EWRONGFS never visible outside the kernel */
191 #define EWRONGFS EINVAL /* Mount with wrong filesystem type */
194 * XXX EFSCORRUPTED needs a real value in errno.h. asm-i386/errno.h won't
195 * return codes out of its known range in errno.
196 * XXX Also note: needs to be < 1000 and fairly unique on Linux (mustn't
197 * conflict with any code we use already or any code a driver may use)
198 * XXX Some options (currently we do #2):
199 * 1/ New error code ["Filesystem is corrupted", _after_ glibc updated]
200 * 2/ 990 ["Unknown error 990"]
201 * 3/ EUCLEAN ["Structure needs cleaning"]
202 * 4/ Convert EFSCORRUPTED to EIO [just prior to return into userspace]
204 #define EFSCORRUPTED 990 /* Filesystem is corrupted */
206 #define SYNCHRONIZE() barrier()
207 #define __return_address __builtin_return_address(0)
210 * IRIX (BSD) quotactl makes use of separate commands for user/group,
211 * whereas on Linux the syscall encodes this information into the cmd
212 * field (see the QCMD macro in quota.h). These macros help keep the
213 * code portable - they are not visible from the syscall interface.
215 #define Q_XSETGQLIM XQM_CMD(8) /* set groups disk limits */
216 #define Q_XGETGQUOTA XQM_CMD(9) /* get groups disk limits */
217 #define Q_XSETPQLIM XQM_CMD(10) /* set projects disk limits */
218 #define Q_XGETPQUOTA XQM_CMD(11) /* get projects disk limits */
221 #define MAXPATHLEN 1024
223 #define MIN(a,b) (min(a,b))
224 #define MAX(a,b) (max(a,b))
225 #define howmany(x, y) (((x)+((y)-1))/(y))
226 #define roundup(x, y) ((((x)+((y)-1))/(y))*(y))
229 * Various platform dependent calls that don't fit anywhere else
231 #define xfs_sort(a,n,s,fn) sort(a,n,s,fn,NULL)
232 #define xfs_stack_trace() dump_stack()
233 #define xfs_itruncate_data(ip, off) \
234 (-vmtruncate(LINVFS_GET_IP(XFS_ITOV(ip)), (off)))
235 #define xfs_statvfs_fsid(statp, mp) \
236 ({ u64 id = huge_encode_dev((mp)->m_dev); \
237 __kernel_fsid_t *fsid = &(statp)->f_fsid; \
238 (fsid->val[0] = (u32)id, fsid->val[1] = (u32)(id >> 32)); })
241 /* Move the kernel do_div definition off to one side */
244 /* For ia32 we need to pull some tricks to get past various versions
245 * of the compiler which do not like us using do_div in the middle
246 * of large functions.
248 static inline __u32 xfs_do_div(void *a, __u32 b, int n)
254 mod = *(__u32 *)a % b;
255 *(__u32 *)a = *(__u32 *)a / b;
259 unsigned long __upper, __low, __high, __mod;
260 __u64 c = *(__u64 *)a;
261 __upper = __high = c >> 32;
264 __upper = __high % (b);
265 __high = __high / (b);
267 asm("divl %2":"=a" (__low), "=d" (__mod):"rm" (b), "0" (__low), "1" (__upper));
268 asm("":"=A" (c):"a" (__low),"d" (__high));
278 /* Side effect free 64 bit mod operation */
279 static inline __u32 xfs_do_mod(void *a, __u32 b, int n)
283 return *(__u32 *)a % b;
286 unsigned long __upper, __low, __high, __mod;
287 __u64 c = *(__u64 *)a;
288 __upper = __high = c >> 32;
291 __upper = __high % (b);
292 __high = __high / (b);
294 asm("divl %2":"=a" (__low), "=d" (__mod):"rm" (b), "0" (__low), "1" (__upper));
295 asm("":"=A" (c):"a" (__low),"d" (__high));
304 static inline __u32 xfs_do_div(void *a, __u32 b, int n)
310 mod = *(__u32 *)a % b;
311 *(__u32 *)a = *(__u32 *)a / b;
314 mod = do_div(*(__u64 *)a, b);
322 /* Side effect free 64 bit mod operation */
323 static inline __u32 xfs_do_mod(void *a, __u32 b, int n)
327 return *(__u32 *)a % b;
330 __u64 c = *(__u64 *)a;
341 #define do_div(a, b) xfs_do_div(&(a), (b), sizeof(a))
342 #define do_mod(a, b) xfs_do_mod(&(a), (b), sizeof(a))
344 static inline __uint64_t roundup_64(__uint64_t x, __uint32_t y)
351 #endif /* __XFS_LINUX__ */