1 /* 2 * Copyright (c) 2000-2005 Silicon Graphics, Inc. 3 * All Rights Reserved. 4 * 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. 8 * 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. 13 * 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 17 */ 18 #ifndef __XFS_LINUX__ 19 #define __XFS_LINUX__ 20 21 #include <linux/types.h> 22 #include <linux/uuid.h> 23 24 /* 25 * Kernel specific type declarations for XFS 26 */ 27 28 typedef __s64 xfs_off_t; /* <file offset> type */ 29 typedef unsigned long long xfs_ino_t; /* <inode> type */ 30 typedef __s64 xfs_daddr_t; /* <disk address> type */ 31 typedef __u32 xfs_dev_t; 32 typedef __u32 xfs_nlink_t; 33 34 #include "xfs_types.h" 35 36 #include "kmem.h" 37 #include "mrlock.h" 38 39 #include <linux/semaphore.h> 40 #include <linux/mm.h> 41 #include <linux/kernel.h> 42 #include <linux/blkdev.h> 43 #include <linux/slab.h> 44 #include <linux/crc32c.h> 45 #include <linux/module.h> 46 #include <linux/mutex.h> 47 #include <linux/file.h> 48 #include <linux/swap.h> 49 #include <linux/errno.h> 50 #include <linux/sched/signal.h> 51 #include <linux/bitops.h> 52 #include <linux/major.h> 53 #include <linux/pagemap.h> 54 #include <linux/vfs.h> 55 #include <linux/seq_file.h> 56 #include <linux/init.h> 57 #include <linux/list.h> 58 #include <linux/proc_fs.h> 59 #include <linux/sort.h> 60 #include <linux/cpu.h> 61 #include <linux/notifier.h> 62 #include <linux/delay.h> 63 #include <linux/log2.h> 64 #include <linux/spinlock.h> 65 #include <linux/random.h> 66 #include <linux/ctype.h> 67 #include <linux/writeback.h> 68 #include <linux/capability.h> 69 #include <linux/kthread.h> 70 #include <linux/freezer.h> 71 #include <linux/list_sort.h> 72 #include <linux/ratelimit.h> 73 #include <linux/rhashtable.h> 74 75 #include <asm/page.h> 76 #include <asm/div64.h> 77 #include <asm/param.h> 78 #include <linux/uaccess.h> 79 #include <asm/byteorder.h> 80 #include <asm/unaligned.h> 81 82 #include "xfs_fs.h" 83 #include "xfs_stats.h" 84 #include "xfs_sysctl.h" 85 #include "xfs_iops.h" 86 #include "xfs_aops.h" 87 #include "xfs_super.h" 88 #include "xfs_cksum.h" 89 #include "xfs_buf.h" 90 #include "xfs_message.h" 91 92 #ifdef __BIG_ENDIAN 93 #define XFS_NATIVE_HOST 1 94 #else 95 #undef XFS_NATIVE_HOST 96 #endif 97 98 #define irix_sgid_inherit xfs_params.sgid_inherit.val 99 #define irix_symlink_mode xfs_params.symlink_mode.val 100 #define xfs_panic_mask xfs_params.panic_mask.val 101 #define xfs_error_level xfs_params.error_level.val 102 #define xfs_syncd_centisecs xfs_params.syncd_timer.val 103 #define xfs_stats_clear xfs_params.stats_clear.val 104 #define xfs_inherit_sync xfs_params.inherit_sync.val 105 #define xfs_inherit_nodump xfs_params.inherit_nodump.val 106 #define xfs_inherit_noatime xfs_params.inherit_noatim.val 107 #define xfs_inherit_nosymlinks xfs_params.inherit_nosym.val 108 #define xfs_rotorstep xfs_params.rotorstep.val 109 #define xfs_inherit_nodefrag xfs_params.inherit_nodfrg.val 110 #define xfs_fstrm_centisecs xfs_params.fstrm_timer.val 111 #define xfs_eofb_secs xfs_params.eofb_timer.val 112 #define xfs_cowb_secs xfs_params.cowb_timer.val 113 114 #define current_cpu() (raw_smp_processor_id()) 115 #define current_pid() (current->pid) 116 #define current_test_flags(f) (current->flags & (f)) 117 #define current_set_flags_nested(sp, f) \ 118 (*(sp) = current->flags, current->flags |= (f)) 119 #define current_clear_flags_nested(sp, f) \ 120 (*(sp) = current->flags, current->flags &= ~(f)) 121 #define current_restore_flags_nested(sp, f) \ 122 (current->flags = ((current->flags & ~(f)) | (*(sp) & (f)))) 123 124 #define spinlock_destroy(lock) 125 126 #define NBBY 8 /* number of bits per byte */ 127 128 /* 129 * Size of block device i/o is parameterized here. 130 * Currently the system supports page-sized i/o. 131 */ 132 #define BLKDEV_IOSHIFT PAGE_SHIFT 133 #define BLKDEV_IOSIZE (1<<BLKDEV_IOSHIFT) 134 /* number of BB's per block device block */ 135 #define BLKDEV_BB BTOBB(BLKDEV_IOSIZE) 136 137 #define ENOATTR ENODATA /* Attribute not found */ 138 #define EWRONGFS EINVAL /* Mount with wrong filesystem type */ 139 #define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */ 140 #define EFSBADCRC EBADMSG /* Bad CRC detected */ 141 142 #define SYNCHRONIZE() barrier() 143 #define __return_address __builtin_return_address(0) 144 145 /* 146 * Return the address of a label. Use barrier() so that the optimizer 147 * won't reorder code to refactor the error jumpouts into a single 148 * return, which throws off the reported address. 149 */ 150 #define __this_address ({ __label__ __here; __here: barrier(); &&__here; }) 151 152 #define XFS_PROJID_DEFAULT 0 153 154 #define MIN(a,b) (min(a,b)) 155 #define MAX(a,b) (max(a,b)) 156 #define howmany(x, y) (((x)+((y)-1))/(y)) 157 158 static inline void delay(long ticks) 159 { 160 schedule_timeout_uninterruptible(ticks); 161 } 162 163 /* 164 * XFS wrapper structure for sysfs support. It depends on external data 165 * structures and is embedded in various internal data structures to implement 166 * the XFS sysfs object heirarchy. Define it here for broad access throughout 167 * the codebase. 168 */ 169 struct xfs_kobj { 170 struct kobject kobject; 171 struct completion complete; 172 }; 173 174 struct xstats { 175 struct xfsstats __percpu *xs_stats; 176 struct xfs_kobj xs_kobj; 177 }; 178 179 extern struct xstats xfsstats; 180 181 /* Kernel uid/gid conversion. These are used to convert to/from the on disk 182 * uid_t/gid_t types to the kuid_t/kgid_t types that the kernel uses internally. 183 * The conversion here is type only, the value will remain the same since we 184 * are converting to the init_user_ns. The uid is later mapped to a particular 185 * user namespace value when crossing the kernel/user boundary. 186 */ 187 static inline uint32_t xfs_kuid_to_uid(kuid_t uid) 188 { 189 return from_kuid(&init_user_ns, uid); 190 } 191 192 static inline kuid_t xfs_uid_to_kuid(uint32_t uid) 193 { 194 return make_kuid(&init_user_ns, uid); 195 } 196 197 static inline uint32_t xfs_kgid_to_gid(kgid_t gid) 198 { 199 return from_kgid(&init_user_ns, gid); 200 } 201 202 static inline kgid_t xfs_gid_to_kgid(uint32_t gid) 203 { 204 return make_kgid(&init_user_ns, gid); 205 } 206 207 static inline dev_t xfs_to_linux_dev_t(xfs_dev_t dev) 208 { 209 return MKDEV(sysv_major(dev) & 0x1ff, sysv_minor(dev)); 210 } 211 212 static inline xfs_dev_t linux_to_xfs_dev_t(dev_t dev) 213 { 214 return sysv_encode_dev(dev); 215 } 216 217 /* 218 * Various platform dependent calls that don't fit anywhere else 219 */ 220 #define xfs_sort(a,n,s,fn) sort(a,n,s,fn,NULL) 221 #define xfs_stack_trace() dump_stack() 222 223 /* Side effect free 64 bit mod operation */ 224 static inline __u32 xfs_do_mod(void *a, __u32 b, int n) 225 { 226 switch (n) { 227 case 4: 228 return *(__u32 *)a % b; 229 case 8: 230 { 231 __u64 c = *(__u64 *)a; 232 return do_div(c, b); 233 } 234 } 235 236 /* NOTREACHED */ 237 return 0; 238 } 239 240 #define do_mod(a, b) xfs_do_mod(&(a), (b), sizeof(a)) 241 242 static inline uint64_t roundup_64(uint64_t x, uint32_t y) 243 { 244 x += y - 1; 245 do_div(x, y); 246 return x * y; 247 } 248 249 static inline uint64_t howmany_64(uint64_t x, uint32_t y) 250 { 251 x += y - 1; 252 do_div(x, y); 253 return x; 254 } 255 256 #define ASSERT_ALWAYS(expr) \ 257 (likely(expr) ? (void)0 : assfail(#expr, __FILE__, __LINE__)) 258 259 #ifdef DEBUG 260 #define ASSERT(expr) \ 261 (likely(expr) ? (void)0 : assfail(#expr, __FILE__, __LINE__)) 262 263 #else /* !DEBUG */ 264 265 #ifdef XFS_WARN 266 267 #define ASSERT(expr) \ 268 (likely(expr) ? (void)0 : asswarn(#expr, __FILE__, __LINE__)) 269 270 #else /* !DEBUG && !XFS_WARN */ 271 272 #define ASSERT(expr) ((void)0) 273 274 #endif /* XFS_WARN */ 275 #endif /* DEBUG */ 276 277 #define STATIC static noinline 278 279 #ifdef CONFIG_XFS_RT 280 281 /* 282 * make sure we ignore the inode flag if the filesystem doesn't have a 283 * configured realtime device. 284 */ 285 #define XFS_IS_REALTIME_INODE(ip) \ 286 (((ip)->i_d.di_flags & XFS_DIFLAG_REALTIME) && \ 287 (ip)->i_mount->m_rtdev_targp) 288 #define XFS_IS_REALTIME_MOUNT(mp) ((mp)->m_rtdev_targp ? 1 : 0) 289 #else 290 #define XFS_IS_REALTIME_INODE(ip) (0) 291 #define XFS_IS_REALTIME_MOUNT(mp) (0) 292 #endif 293 294 /* 295 * Starting in Linux 4.15, the %p (raw pointer value) printk modifier 296 * prints a hashed version of the pointer to avoid leaking kernel 297 * pointers into dmesg. If we're trying to debug the kernel we want the 298 * raw values, so override this behavior as best we can. 299 */ 300 #ifdef DEBUG 301 # define PTR_FMT "%px" 302 #else 303 # define PTR_FMT "%p" 304 #endif 305 306 #endif /* __XFS_LINUX__ */ 307