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Linux/fs/xfs/xfs_linux.h

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  * Copyright (c) 2000-2005 Silicon Graphics, Inc.
  4  * All Rights Reserved.
  5  */
  6 #ifndef __XFS_LINUX__
  7 #define __XFS_LINUX__
  8 
  9 #include <linux/types.h>
 10 #include <linux/uuid.h>
 11 
 12 /*
 13  * Kernel specific type declarations for XFS
 14  */
 15 
 16 typedef __s64                   xfs_off_t;      /* <file offset> type */
 17 typedef unsigned long long      xfs_ino_t;      /* <inode> type */
 18 typedef __s64                   xfs_daddr_t;    /* <disk address> type */
 19 typedef __u32                   xfs_dev_t;
 20 typedef __u32                   xfs_nlink_t;
 21 
 22 #include "xfs_types.h"
 23 
 24 #include "kmem.h"
 25 #include "mrlock.h"
 26 
 27 #include <linux/semaphore.h>
 28 #include <linux/mm.h>
 29 #include <linux/sched/mm.h>
 30 #include <linux/kernel.h>
 31 #include <linux/blkdev.h>
 32 #include <linux/slab.h>
 33 #include <linux/crc32c.h>
 34 #include <linux/module.h>
 35 #include <linux/mutex.h>
 36 #include <linux/file.h>
 37 #include <linux/swap.h>
 38 #include <linux/errno.h>
 39 #include <linux/sched/signal.h>
 40 #include <linux/bitops.h>
 41 #include <linux/major.h>
 42 #include <linux/pagemap.h>
 43 #include <linux/vfs.h>
 44 #include <linux/seq_file.h>
 45 #include <linux/init.h>
 46 #include <linux/list.h>
 47 #include <linux/proc_fs.h>
 48 #include <linux/sort.h>
 49 #include <linux/cpu.h>
 50 #include <linux/notifier.h>
 51 #include <linux/delay.h>
 52 #include <linux/log2.h>
 53 #include <linux/spinlock.h>
 54 #include <linux/random.h>
 55 #include <linux/ctype.h>
 56 #include <linux/writeback.h>
 57 #include <linux/capability.h>
 58 #include <linux/kthread.h>
 59 #include <linux/freezer.h>
 60 #include <linux/list_sort.h>
 61 #include <linux/ratelimit.h>
 62 #include <linux/rhashtable.h>
 63 
 64 #include <asm/page.h>
 65 #include <asm/div64.h>
 66 #include <asm/param.h>
 67 #include <linux/uaccess.h>
 68 #include <asm/byteorder.h>
 69 #include <asm/unaligned.h>
 70 
 71 #include "xfs_fs.h"
 72 #include "xfs_stats.h"
 73 #include "xfs_sysctl.h"
 74 #include "xfs_iops.h"
 75 #include "xfs_aops.h"
 76 #include "xfs_super.h"
 77 #include "xfs_cksum.h"
 78 #include "xfs_buf.h"
 79 #include "xfs_message.h"
 80 
 81 #ifdef __BIG_ENDIAN
 82 #define XFS_NATIVE_HOST 1
 83 #else
 84 #undef XFS_NATIVE_HOST
 85 #endif
 86 
 87 #define irix_sgid_inherit       xfs_params.sgid_inherit.val
 88 #define irix_symlink_mode       xfs_params.symlink_mode.val
 89 #define xfs_panic_mask          xfs_params.panic_mask.val
 90 #define xfs_error_level         xfs_params.error_level.val
 91 #define xfs_syncd_centisecs     xfs_params.syncd_timer.val
 92 #define xfs_stats_clear         xfs_params.stats_clear.val
 93 #define xfs_inherit_sync        xfs_params.inherit_sync.val
 94 #define xfs_inherit_nodump      xfs_params.inherit_nodump.val
 95 #define xfs_inherit_noatime     xfs_params.inherit_noatim.val
 96 #define xfs_inherit_nosymlinks  xfs_params.inherit_nosym.val
 97 #define xfs_rotorstep           xfs_params.rotorstep.val
 98 #define xfs_inherit_nodefrag    xfs_params.inherit_nodfrg.val
 99 #define xfs_fstrm_centisecs     xfs_params.fstrm_timer.val
100 #define xfs_eofb_secs           xfs_params.eofb_timer.val
101 #define xfs_cowb_secs           xfs_params.cowb_timer.val
102 
103 #define current_cpu()           (raw_smp_processor_id())
104 #define current_pid()           (current->pid)
105 #define current_test_flags(f)   (current->flags & (f))
106 #define current_set_flags_nested(sp, f)         \
107                 (*(sp) = current->flags, current->flags |= (f))
108 #define current_clear_flags_nested(sp, f)       \
109                 (*(sp) = current->flags, current->flags &= ~(f))
110 #define current_restore_flags_nested(sp, f)     \
111                 (current->flags = ((current->flags & ~(f)) | (*(sp) & (f))))
112 
113 #define NBBY            8               /* number of bits per byte */
114 
115 /*
116  * Size of block device i/o is parameterized here.
117  * Currently the system supports page-sized i/o.
118  */
119 #define BLKDEV_IOSHIFT          PAGE_SHIFT
120 #define BLKDEV_IOSIZE           (1<<BLKDEV_IOSHIFT)
121 /* number of BB's per block device block */
122 #define BLKDEV_BB               BTOBB(BLKDEV_IOSIZE)
123 
124 #define ENOATTR         ENODATA         /* Attribute not found */
125 #define EWRONGFS        EINVAL          /* Mount with wrong filesystem type */
126 #define EFSCORRUPTED    EUCLEAN         /* Filesystem is corrupted */
127 #define EFSBADCRC       EBADMSG         /* Bad CRC detected */
128 
129 #define SYNCHRONIZE()   barrier()
130 #define __return_address __builtin_return_address(0)
131 
132 /*
133  * Return the address of a label.  Use barrier() so that the optimizer
134  * won't reorder code to refactor the error jumpouts into a single
135  * return, which throws off the reported address.
136  */
137 #define __this_address  ({ __label__ __here; __here: barrier(); &&__here; })
138 
139 #define XFS_PROJID_DEFAULT      0
140 
141 #define howmany(x, y)   (((x)+((y)-1))/(y))
142 
143 static inline void delay(long ticks)
144 {
145         schedule_timeout_uninterruptible(ticks);
146 }
147 
148 /*
149  * XFS wrapper structure for sysfs support. It depends on external data
150  * structures and is embedded in various internal data structures to implement
151  * the XFS sysfs object heirarchy. Define it here for broad access throughout
152  * the codebase.
153  */
154 struct xfs_kobj {
155         struct kobject          kobject;
156         struct completion       complete;
157 };
158 
159 struct xstats {
160         struct xfsstats __percpu        *xs_stats;
161         struct xfs_kobj                 xs_kobj;
162 };
163 
164 extern struct xstats xfsstats;
165 
166 /* Kernel uid/gid conversion. These are used to convert to/from the on disk
167  * uid_t/gid_t types to the kuid_t/kgid_t types that the kernel uses internally.
168  * The conversion here is type only, the value will remain the same since we
169  * are converting to the init_user_ns. The uid is later mapped to a particular
170  * user namespace value when crossing the kernel/user boundary.
171  */
172 static inline uint32_t xfs_kuid_to_uid(kuid_t uid)
173 {
174         return from_kuid(&init_user_ns, uid);
175 }
176 
177 static inline kuid_t xfs_uid_to_kuid(uint32_t uid)
178 {
179         return make_kuid(&init_user_ns, uid);
180 }
181 
182 static inline uint32_t xfs_kgid_to_gid(kgid_t gid)
183 {
184         return from_kgid(&init_user_ns, gid);
185 }
186 
187 static inline kgid_t xfs_gid_to_kgid(uint32_t gid)
188 {
189         return make_kgid(&init_user_ns, gid);
190 }
191 
192 static inline dev_t xfs_to_linux_dev_t(xfs_dev_t dev)
193 {
194         return MKDEV(sysv_major(dev) & 0x1ff, sysv_minor(dev));
195 }
196 
197 static inline xfs_dev_t linux_to_xfs_dev_t(dev_t dev)
198 {
199         return sysv_encode_dev(dev);
200 }
201 
202 /*
203  * Various platform dependent calls that don't fit anywhere else
204  */
205 #define xfs_sort(a,n,s,fn)      sort(a,n,s,fn,NULL)
206 #define xfs_stack_trace()       dump_stack()
207 
208 static inline uint64_t roundup_64(uint64_t x, uint32_t y)
209 {
210         x += y - 1;
211         do_div(x, y);
212         return x * y;
213 }
214 
215 static inline uint64_t howmany_64(uint64_t x, uint32_t y)
216 {
217         x += y - 1;
218         do_div(x, y);
219         return x;
220 }
221 
222 int xfs_rw_bdev(struct block_device *bdev, sector_t sector, unsigned int count,
223                 char *data, unsigned int op);
224 
225 #define ASSERT_ALWAYS(expr)     \
226         (likely(expr) ? (void)0 : assfail(#expr, __FILE__, __LINE__))
227 
228 #ifdef DEBUG
229 #define ASSERT(expr)    \
230         (likely(expr) ? (void)0 : assfail(#expr, __FILE__, __LINE__))
231 
232 #else   /* !DEBUG */
233 
234 #ifdef XFS_WARN
235 
236 #define ASSERT(expr)    \
237         (likely(expr) ? (void)0 : asswarn(#expr, __FILE__, __LINE__))
238 
239 #else   /* !DEBUG && !XFS_WARN */
240 
241 #define ASSERT(expr)    ((void)0)
242 
243 #endif /* XFS_WARN */
244 #endif /* DEBUG */
245 
246 #define STATIC static noinline
247 
248 #ifdef CONFIG_XFS_RT
249 
250 /*
251  * make sure we ignore the inode flag if the filesystem doesn't have a
252  * configured realtime device.
253  */
254 #define XFS_IS_REALTIME_INODE(ip)                       \
255         (((ip)->i_d.di_flags & XFS_DIFLAG_REALTIME) &&  \
256          (ip)->i_mount->m_rtdev_targp)
257 #define XFS_IS_REALTIME_MOUNT(mp) ((mp)->m_rtdev_targp ? 1 : 0)
258 #else
259 #define XFS_IS_REALTIME_INODE(ip) (0)
260 #define XFS_IS_REALTIME_MOUNT(mp) (0)
261 #endif
262 
263 /*
264  * Starting in Linux 4.15, the %p (raw pointer value) printk modifier
265  * prints a hashed version of the pointer to avoid leaking kernel
266  * pointers into dmesg.  If we're trying to debug the kernel we want the
267  * raw values, so override this behavior as best we can.
268  */
269 #ifdef DEBUG
270 # define PTR_FMT "%px"
271 #else
272 # define PTR_FMT "%p"
273 #endif
274 
275 #endif /* __XFS_LINUX__ */
276 

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