2 * Copyright (c) 2000-2003 Silicon Graphics, Inc. All Rights Reserved.
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.
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.
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.
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.
23 * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
24 * Mountain View, CA 94043, or:
28 * For further information regarding this notice, see:
30 * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
35 #include <linux/types.h>
36 #include <linux/config.h>
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.
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
49 # define XFS_BIG_INUMS 0
52 # define XFS_BIG_BLKNOS 0
53 # define XFS_BIG_INUMS 0
56 #include <xfs_types.h>
67 #include <support/qsort.h>
68 #include <support/ktrace.h>
69 #include <support/debug.h>
70 #include <support/move.h>
71 #include <support/uuid.h>
74 #include <linux/kernel.h>
75 #include <linux/blkdev.h>
76 #include <linux/slab.h>
77 #include <linux/module.h>
78 #include <linux/file.h>
79 #include <linux/swap.h>
80 #include <linux/errno.h>
81 #include <linux/sched.h>
82 #include <linux/bitops.h>
83 #include <linux/major.h>
84 #include <linux/pagemap.h>
85 #include <linux/vfs.h>
86 #include <linux/seq_file.h>
87 #include <linux/init.h>
88 #include <linux/proc_fs.h>
89 #include <linux/version.h>
92 #include <asm/div64.h>
93 #include <asm/param.h>
94 #include <asm/uaccess.h>
95 #include <asm/byteorder.h>
96 #include <asm/unaligned.h>
98 #include <xfs_behavior.h>
100 #include <xfs_cred.h>
101 #include <xfs_vnode.h>
102 #include <xfs_stats.h>
103 #include <xfs_sysctl.h>
104 #include <xfs_iops.h>
105 #include <xfs_super.h>
106 #include <xfs_globals.h>
107 #include <xfs_fs_subr.h>
112 * Feature macros (disable/enable)
114 #undef HAVE_REFCACHE /* reference cache not needed for NFS in 2.6 */
115 #define HAVE_SENDFILE /* sendfile(2) exists in 2.6, but not in 2.4 */
118 * State flag for unwritten extent buffers.
120 * We need to be able to distinguish between these and delayed
121 * allocate buffers within XFS. The generic IO path code does
122 * not need to distinguish - we use the BH_Delay flag for both
123 * delalloc and these ondisk-uninitialised buffers.
125 BUFFER_FNS(PrivateStart, unwritten);
126 static inline void set_buffer_unwritten_io(struct buffer_head *bh)
128 bh->b_end_io = linvfs_unwritten_done;
131 #define xfs_refcache_size xfs_params.refcache_size.val
132 #define xfs_refcache_purge_count xfs_params.refcache_purge.val
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_interval (xfs_params.sync_interval.val * HZ / USER_HZ)
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_flush_interval (xfs_params.flush_interval.val * HZ / USER_HZ)
144 #define xfs_age_buffer (xfs_params.age_buffer.val * HZ / USER_HZ)
146 #define current_cpu() smp_processor_id()
147 #define current_pid() (current->pid)
148 #define current_fsuid(cred) (current->fsuid)
149 #define current_fsgid(cred) (current->fsgid)
151 #define NBPP PAGE_SIZE
152 #define DPPSHFT (PAGE_SHIFT - 9)
153 #define NDPP (1 << (PAGE_SHIFT - 9))
154 #define dtop(DD) (((DD) + NDPP - 1) >> DPPSHFT)
155 #define dtopt(DD) ((DD) >> DPPSHFT)
156 #define dpoff(DD) ((DD) & (NDPP-1))
158 #define NBBY 8 /* number of bits per byte */
159 #define NBPC PAGE_SIZE /* Number of bytes per click */
160 #define BPCSHIFT PAGE_SHIFT /* LOG2(NBPC) if exact */
163 * Size of block device i/o is parameterized here.
164 * Currently the system supports page-sized i/o.
166 #define BLKDEV_IOSHIFT BPCSHIFT
167 #define BLKDEV_IOSIZE (1<<BLKDEV_IOSHIFT)
168 /* number of BB's per block device block */
169 #define BLKDEV_BB BTOBB(BLKDEV_IOSIZE)
171 /* bytes to clicks */
172 #define btoc(x) (((__psunsigned_t)(x)+(NBPC-1))>>BPCSHIFT)
173 #define btoct(x) ((__psunsigned_t)(x)>>BPCSHIFT)
174 #define btoc64(x) (((__uint64_t)(x)+(NBPC-1))>>BPCSHIFT)
175 #define btoct64(x) ((__uint64_t)(x)>>BPCSHIFT)
176 #define io_btoc(x) (((__psunsigned_t)(x)+(IO_NBPC-1))>>IO_BPCSHIFT)
177 #define io_btoct(x) ((__psunsigned_t)(x)>>IO_BPCSHIFT)
179 /* off_t bytes to clicks */
180 #define offtoc(x) (((__uint64_t)(x)+(NBPC-1))>>BPCSHIFT)
181 #define offtoct(x) ((xfs_off_t)(x)>>BPCSHIFT)
183 /* clicks to off_t bytes */
184 #define ctooff(x) ((xfs_off_t)(x)<<BPCSHIFT)
186 /* clicks to bytes */
187 #define ctob(x) ((__psunsigned_t)(x)<<BPCSHIFT)
188 #define btoct(x) ((__psunsigned_t)(x)>>BPCSHIFT)
189 #define ctob64(x) ((__uint64_t)(x)<<BPCSHIFT)
190 #define io_ctob(x) ((__psunsigned_t)(x)<<IO_BPCSHIFT)
192 /* bytes to clicks */
193 #define btoc(x) (((__psunsigned_t)(x)+(NBPC-1))>>BPCSHIFT)
196 #define FSC_NOTIFY_NAME_CHANGED(vp)
200 #define ENOATTR ENODATA /* Attribute not found */
203 /* Note: EWRONGFS never visible outside the kernel */
204 #define EWRONGFS EINVAL /* Mount with wrong filesystem type */
207 * XXX EFSCORRUPTED needs a real value in errno.h. asm-i386/errno.h won't
208 * return codes out of its known range in errno.
209 * XXX Also note: needs to be < 1000 and fairly unique on Linux (mustn't
210 * conflict with any code we use already or any code a driver may use)
211 * XXX Some options (currently we do #2):
212 * 1/ New error code ["Filesystem is corrupted", _after_ glibc updated]
213 * 2/ 990 ["Unknown error 990"]
214 * 3/ EUCLEAN ["Structure needs cleaning"]
215 * 4/ Convert EFSCORRUPTED to EIO [just prior to return into userspace]
217 #define EFSCORRUPTED 990 /* Filesystem is corrupted */
219 #define SYNCHRONIZE() barrier()
220 #define __return_address __builtin_return_address(0)
223 * IRIX (BSD) quotactl makes use of separate commands for user/group,
224 * whereas on Linux the syscall encodes this information into the cmd
225 * field (see the QCMD macro in quota.h). These macros help keep the
226 * code portable - they are not visible from the syscall interface.
228 #define Q_XSETGQLIM XQM_CMD(0x8) /* set groups disk limits */
229 #define Q_XGETGQUOTA XQM_CMD(0x9) /* get groups disk limits */
231 /* IRIX uses a dynamic sizing algorithm (ndquot = 200 + numprocs*2) */
232 /* we may well need to fine-tune this if it ever becomes an issue. */
233 #define DQUOT_MAX_HEURISTIC 1024 /* NR_DQUOTS */
234 #define ndquot DQUOT_MAX_HEURISTIC
236 /* IRIX uses the current size of the name cache to guess a good value */
237 /* - this isn't the same but is a good enough starting point for now. */
238 #define DQUOT_HASH_HEURISTIC files_stat.nr_files
240 /* IRIX inodes maintain the project ID also, zero this field on Linux */
241 #define DEFAULT_PROJID 0
242 #define dfltprid DEFAULT_PROJID
244 #define MAXPATHLEN 1024
246 #define MIN(a,b) (min(a,b))
247 #define MAX(a,b) (max(a,b))
248 #define howmany(x, y) (((x)+((y)-1))/(y))
249 #define roundup(x, y) ((((x)+((y)-1))/(y))*(y))
251 #define xfs_stack_trace() dump_stack()
253 #define xfs_itruncate_data(ip, off) \
254 (-vmtruncate(LINVFS_GET_IP(XFS_ITOV(ip)), (off)))
257 /* Move the kernel do_div definition off to one side */
260 /* For ia32 we need to pull some tricks to get past various versions
261 * of the compiler which do not like us using do_div in the middle
262 * of large functions.
264 static inline __u32 xfs_do_div(void *a, __u32 b, int n)
270 mod = *(__u32 *)a % b;
271 *(__u32 *)a = *(__u32 *)a / b;
275 unsigned long __upper, __low, __high, __mod;
276 __u64 c = *(__u64 *)a;
277 __upper = __high = c >> 32;
280 __upper = __high % (b);
281 __high = __high / (b);
283 asm("divl %2":"=a" (__low), "=d" (__mod):"rm" (b), "0" (__low), "1" (__upper));
284 asm("":"=A" (c):"a" (__low),"d" (__high));
294 /* Side effect free 64 bit mod operation */
295 static inline __u32 xfs_do_mod(void *a, __u32 b, int n)
299 return *(__u32 *)a % b;
302 unsigned long __upper, __low, __high, __mod;
303 __u64 c = *(__u64 *)a;
304 __upper = __high = c >> 32;
307 __upper = __high % (b);
308 __high = __high / (b);
310 asm("divl %2":"=a" (__low), "=d" (__mod):"rm" (b), "0" (__low), "1" (__upper));
311 asm("":"=A" (c):"a" (__low),"d" (__high));
320 static inline __u32 xfs_do_div(void *a, __u32 b, int n)
326 mod = *(__u32 *)a % b;
327 *(__u32 *)a = *(__u32 *)a / b;
330 mod = do_div(*(__u64 *)a, b);
338 /* Side effect free 64 bit mod operation */
339 static inline __u32 xfs_do_mod(void *a, __u32 b, int n)
343 return *(__u32 *)a % b;
346 __u64 c = *(__u64 *)a;
357 #define do_div(a, b) xfs_do_div(&(a), (b), sizeof(a))
358 #define do_mod(a, b) xfs_do_mod(&(a), (b), sizeof(a))
360 static inline __uint64_t roundup_64(__uint64_t x, __uint32_t y)
367 #endif /* __XFS_LINUX__ */