2 * Copyright (c) 2000-2004 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/list.h>
89 #include <linux/proc_fs.h>
90 #include <linux/version.h>
93 #include <asm/div64.h>
94 #include <asm/param.h>
95 #include <asm/uaccess.h>
96 #include <asm/byteorder.h>
97 #include <asm/unaligned.h>
99 #include <xfs_behavior.h>
101 #include <xfs_cred.h>
102 #include <xfs_vnode.h>
103 #include <xfs_stats.h>
104 #include <xfs_sysctl.h>
105 #include <xfs_iops.h>
106 #include <xfs_super.h>
107 #include <xfs_globals.h>
108 #include <xfs_fs_subr.h>
113 * Feature macros (disable/enable)
115 #undef HAVE_REFCACHE /* reference cache not needed for NFS in 2.6 */
116 #define HAVE_SENDFILE /* sendfile(2) exists in 2.6, but not in 2.4 */
119 * State flag for unwritten extent buffers.
121 * We need to be able to distinguish between these and delayed
122 * allocate buffers within XFS. The generic IO path code does
123 * not need to distinguish - we use the BH_Delay flag for both
124 * delalloc and these ondisk-uninitialised buffers.
126 BUFFER_FNS(PrivateStart, unwritten);
127 static inline void set_buffer_unwritten_io(struct buffer_head *bh)
129 bh->b_end_io = linvfs_unwritten_done;
132 #define restricted_chown xfs_params.restrict_chown.val
133 #define irix_sgid_inherit xfs_params.sgid_inherit.val
134 #define irix_symlink_mode xfs_params.symlink_mode.val
135 #define xfs_panic_mask xfs_params.panic_mask.val
136 #define xfs_error_level xfs_params.error_level.val
137 #define xfs_syncd_centisecs xfs_params.syncd_timer.val
138 #define xfs_stats_clear xfs_params.stats_clear.val
139 #define xfs_inherit_sync xfs_params.inherit_sync.val
140 #define xfs_inherit_nodump xfs_params.inherit_nodump.val
141 #define xfs_inherit_noatime xfs_params.inherit_noatim.val
142 #define xfs_buf_timer_centisecs xfs_params.xfs_buf_timer.val
143 #define xfs_buf_age_centisecs xfs_params.xfs_buf_age.val
144 #define xfs_inherit_nosymlinks xfs_params.inherit_nosym.val
145 #define xfs_rotorstep xfs_params.rotorstep.val
147 #define current_cpu() smp_processor_id()
148 #define current_pid() (current->pid)
149 #define current_fsuid(cred) (current->fsuid)
150 #define current_fsgid(cred) (current->fsgid)
152 #define NBPP PAGE_SIZE
153 #define DPPSHFT (PAGE_SHIFT - 9)
154 #define NDPP (1 << (PAGE_SHIFT - 9))
155 #define dtop(DD) (((DD) + NDPP - 1) >> DPPSHFT)
156 #define dtopt(DD) ((DD) >> DPPSHFT)
157 #define dpoff(DD) ((DD) & (NDPP-1))
159 #define NBBY 8 /* number of bits per byte */
160 #define NBPC PAGE_SIZE /* Number of bytes per click */
161 #define BPCSHIFT PAGE_SHIFT /* LOG2(NBPC) if exact */
164 * Size of block device i/o is parameterized here.
165 * Currently the system supports page-sized i/o.
167 #define BLKDEV_IOSHIFT BPCSHIFT
168 #define BLKDEV_IOSIZE (1<<BLKDEV_IOSHIFT)
169 /* number of BB's per block device block */
170 #define BLKDEV_BB BTOBB(BLKDEV_IOSIZE)
172 /* bytes to clicks */
173 #define btoc(x) (((__psunsigned_t)(x)+(NBPC-1))>>BPCSHIFT)
174 #define btoct(x) ((__psunsigned_t)(x)>>BPCSHIFT)
175 #define btoc64(x) (((__uint64_t)(x)+(NBPC-1))>>BPCSHIFT)
176 #define btoct64(x) ((__uint64_t)(x)>>BPCSHIFT)
177 #define io_btoc(x) (((__psunsigned_t)(x)+(IO_NBPC-1))>>IO_BPCSHIFT)
178 #define io_btoct(x) ((__psunsigned_t)(x)>>IO_BPCSHIFT)
180 /* off_t bytes to clicks */
181 #define offtoc(x) (((__uint64_t)(x)+(NBPC-1))>>BPCSHIFT)
182 #define offtoct(x) ((xfs_off_t)(x)>>BPCSHIFT)
184 /* clicks to off_t bytes */
185 #define ctooff(x) ((xfs_off_t)(x)<<BPCSHIFT)
187 /* clicks to bytes */
188 #define ctob(x) ((__psunsigned_t)(x)<<BPCSHIFT)
189 #define btoct(x) ((__psunsigned_t)(x)>>BPCSHIFT)
190 #define ctob64(x) ((__uint64_t)(x)<<BPCSHIFT)
191 #define io_ctob(x) ((__psunsigned_t)(x)<<IO_BPCSHIFT)
193 /* bytes to clicks */
194 #define btoc(x) (((__psunsigned_t)(x)+(NBPC-1))>>BPCSHIFT)
197 #define FSC_NOTIFY_NAME_CHANGED(vp)
201 #define ENOATTR ENODATA /* Attribute not found */
204 /* Note: EWRONGFS never visible outside the kernel */
205 #define EWRONGFS EINVAL /* Mount with wrong filesystem type */
208 * XXX EFSCORRUPTED needs a real value in errno.h. asm-i386/errno.h won't
209 * return codes out of its known range in errno.
210 * XXX Also note: needs to be < 1000 and fairly unique on Linux (mustn't
211 * conflict with any code we use already or any code a driver may use)
212 * XXX Some options (currently we do #2):
213 * 1/ New error code ["Filesystem is corrupted", _after_ glibc updated]
214 * 2/ 990 ["Unknown error 990"]
215 * 3/ EUCLEAN ["Structure needs cleaning"]
216 * 4/ Convert EFSCORRUPTED to EIO [just prior to return into userspace]
218 #define EFSCORRUPTED 990 /* Filesystem is corrupted */
220 #define SYNCHRONIZE() barrier()
221 #define __return_address __builtin_return_address(0)
224 * IRIX (BSD) quotactl makes use of separate commands for user/group,
225 * whereas on Linux the syscall encodes this information into the cmd
226 * field (see the QCMD macro in quota.h). These macros help keep the
227 * code portable - they are not visible from the syscall interface.
229 #define Q_XSETGQLIM XQM_CMD(0x8) /* set groups disk limits */
230 #define Q_XGETGQUOTA XQM_CMD(0x9) /* get groups disk limits */
232 /* IRIX uses a dynamic sizing algorithm (ndquot = 200 + numprocs*2) */
233 /* we may well need to fine-tune this if it ever becomes an issue. */
234 #define DQUOT_MAX_HEURISTIC 1024 /* NR_DQUOTS */
235 #define ndquot DQUOT_MAX_HEURISTIC
237 /* IRIX uses the current size of the name cache to guess a good value */
238 /* - this isn't the same but is a good enough starting point for now. */
239 #define DQUOT_HASH_HEURISTIC files_stat.nr_files
241 /* IRIX inodes maintain the project ID also, zero this field on Linux */
242 #define DEFAULT_PROJID 0
243 #define dfltprid DEFAULT_PROJID
245 #define MAXPATHLEN 1024
247 #define MIN(a,b) (min(a,b))
248 #define MAX(a,b) (max(a,b))
249 #define howmany(x, y) (((x)+((y)-1))/(y))
250 #define roundup(x, y) ((((x)+((y)-1))/(y))*(y))
252 #define xfs_stack_trace() dump_stack()
254 #define xfs_itruncate_data(ip, off) \
255 (-vmtruncate(LINVFS_GET_IP(XFS_ITOV(ip)), (off)))
258 /* Move the kernel do_div definition off to one side */
261 /* For ia32 we need to pull some tricks to get past various versions
262 * of the compiler which do not like us using do_div in the middle
263 * of large functions.
265 static inline __u32 xfs_do_div(void *a, __u32 b, int n)
271 mod = *(__u32 *)a % b;
272 *(__u32 *)a = *(__u32 *)a / b;
276 unsigned long __upper, __low, __high, __mod;
277 __u64 c = *(__u64 *)a;
278 __upper = __high = c >> 32;
281 __upper = __high % (b);
282 __high = __high / (b);
284 asm("divl %2":"=a" (__low), "=d" (__mod):"rm" (b), "0" (__low), "1" (__upper));
285 asm("":"=A" (c):"a" (__low),"d" (__high));
295 /* Side effect free 64 bit mod operation */
296 static inline __u32 xfs_do_mod(void *a, __u32 b, int n)
300 return *(__u32 *)a % b;
303 unsigned long __upper, __low, __high, __mod;
304 __u64 c = *(__u64 *)a;
305 __upper = __high = c >> 32;
308 __upper = __high % (b);
309 __high = __high / (b);
311 asm("divl %2":"=a" (__low), "=d" (__mod):"rm" (b), "0" (__low), "1" (__upper));
312 asm("":"=A" (c):"a" (__low),"d" (__high));
321 static inline __u32 xfs_do_div(void *a, __u32 b, int n)
327 mod = *(__u32 *)a % b;
328 *(__u32 *)a = *(__u32 *)a / b;
331 mod = do_div(*(__u64 *)a, b);
339 /* Side effect free 64 bit mod operation */
340 static inline __u32 xfs_do_mod(void *a, __u32 b, int n)
344 return *(__u32 *)a % b;
347 __u64 c = *(__u64 *)a;
358 #define do_div(a, b) xfs_do_div(&(a), (b), sizeof(a))
359 #define do_mod(a, b) xfs_do_mod(&(a), (b), sizeof(a))
361 static inline __uint64_t roundup_64(__uint64_t x, __uint32_t y)
368 #endif /* __XFS_LINUX__ */