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NFS: Cleanup of NFS write code in preparation for asynchronous o_direct
[deliverable/linux.git] / include / linux / nfs_fs.h
CommitLineData
1da177e4
LT		 1/*
2 * linux/include/linux/nfs_fs.h
3 *
4 * Copyright (C) 1992 Rick Sladkey
5 *
6 * OS-specific nfs filesystem definitions and declarations
7 */
8
9#ifndef _LINUX_NFS_FS_H
10#define _LINUX_NFS_FS_H
11
12#include <linux/config.h>
13#include <linux/in.h>
14#include <linux/mm.h>
15#include <linux/pagemap.h>
16#include <linux/rwsem.h>
17#include <linux/wait.h>
1da177e4
LT		 18
19#include <linux/nfs_fs_sb.h>
20
21#include <linux/sunrpc/debug.h>
22#include <linux/sunrpc/auth.h>
23#include <linux/sunrpc/clnt.h>
24
25#include <linux/nfs.h>
26#include <linux/nfs2.h>
27#include <linux/nfs3.h>
28#include <linux/nfs4.h>
29#include <linux/nfs_xdr.h>
30#include <linux/rwsem.h>
1da177e4
LT		 31#include <linux/mempool.h>
32
33/*
34 * Enable debugging support for nfs client.
35 * Requires RPC_DEBUG.
36 */
37#ifdef RPC_DEBUG
38# define NFS_DEBUG
39#endif
40
03bf4b70
CL		 41/* Default timeout values */
42#define NFS_MAX_UDP_TIMEOUT (60*HZ)
43#define NFS_MAX_TCP_TIMEOUT (600*HZ)
44
1da177e4
LT		 45/*
46 * superblock magic number for NFS
47 */
48#define NFS_SUPER_MAGIC 0x6969
49
50/*
51 * These are the default flags for swap requests
52 */
53#define NFS_RPC_SWAPFLAGS (RPC_TASK_SWAPPER|RPC_TASK_ROOTCREDS)
54
1da177e4
LT		 55/*
56 * When flushing a cluster of dirty pages, there can be different
57 * strategies:
58 */
59#define FLUSH_AGING 0 /* only flush old buffers */
60#define FLUSH_SYNC 1 /* file being synced, or contention */
61#define FLUSH_WAIT 2 /* wait for completion */
62#define FLUSH_STABLE 4 /* commit to stable storage */
63#define FLUSH_LOWPRI 8 /* low priority background flush */
64#define FLUSH_HIGHPRI 16 /* high priority memory reclaim flush */
70b9ecbd 65#define FLUSH_NOCOMMIT 32 /* Don't send the NFSv3/v4 COMMIT */
1da177e4
LT		 66
67#ifdef __KERNEL__
68
69/*
70 * NFSv3/v4 Access mode cache entry
71 */
72struct nfs_access_entry {
73 unsigned long jiffies;
74 struct rpc_cred * cred;
75 int mask;
76};
77
78struct nfs4_state;
79struct nfs_open_context {
80 atomic_t count;
b92dccf6 81 struct vfsmount *vfsmnt;
1da177e4
LT		 82 struct dentry *dentry;
83 struct rpc_cred *cred;
84 struct nfs4_state *state;
85 fl_owner_t lockowner;
86 int mode;
87 int error;
88
89 struct list_head list;
00a92642 90
00a92642 91 __u64 dir_cookie;
1da177e4
LT		 92};
93
94/*
95 * NFSv4 delegation
96 */
97struct nfs_delegation;
98
5c6a9f7d
AG		 99struct posix_acl;
100
1da177e4
LT		 101/*
102 * nfs fs inode data in memory
103 */
104struct nfs_inode {
105 /*
106 * The 64bit 'inode number'
107 */
108 __u64 fileid;
109
110 /*
111 * NFS file handle
112 */
113 struct nfs_fh fh;
114
115 /*
116 * Various flags
117 */
412d582e
CL		 118 unsigned long flags; /* atomic bit ops */
119 unsigned long cache_validity; /* bit mask */
1da177e4
LT		 120
121 /*
24bd68f4 122 * read_cache_jiffies is when we started read-caching this inode.
1da177e4
LT		 123 * attrtimeo is for how long the cached information is assumed
124 * to be valid. A successful attribute revalidation doubles
125 * attrtimeo (up to acregmax/acdirmax), a failure resets it to
126 * acregmin/acdirmin.
127 *
128 * We need to revalidate the cached attrs for this inode if
129 *
130 * jiffies - read_cache_jiffies > attrtimeo
1da177e4 131 */
1da177e4
LT		 132 unsigned long read_cache_jiffies;
133 unsigned long attrtimeo;
134 unsigned long attrtimeo_timestamp;
135 __u64 change_attr; /* v4 only */
136
33801147 137 unsigned long last_updated;
1da177e4
LT		 138 /* "Generation counter" for the attribute cache. This is
139 * bumped whenever we update the metadata on the
140 * server.
141 */
142 unsigned long cache_change_attribute;
143 /*
144 * Counter indicating the number of outstanding requests that
145 * will cause a file data update.
146 */
147 atomic_t data_updates;
148
149 struct nfs_access_entry cache_access;
5c6a9f7d
AG		 150#ifdef CONFIG_NFS_V3_ACL
151 struct posix_acl *acl_access;
152 struct posix_acl *acl_default;
153#endif
1da177e4
LT		 154
155 /*
156 * This is the cookie verifier used for NFSv3 readdir
157 * operations
158 */
159 __u32 cookieverf[2];
160
161 /*
162 * This is the list of dirty unwritten pages.
163 */
164 spinlock_t req_lock;
165 struct list_head dirty;
166 struct list_head commit;
167 struct radix_tree_root nfs_page_tree;
168
169 unsigned int ndirty,
170 ncommit,
171 npages;
172
173 /* Open contexts for shared mmap writes */
174 struct list_head open_files;
175
1da177e4 176#ifdef CONFIG_NFS_V4
e50a1c2e 177 struct nfs4_cached_acl *nfs4_acl;
1da177e4
LT		 178 /* NFSv4 state */
179 struct list_head open_states;
180 struct nfs_delegation *delegation;
181 int delegation_state;
182 struct rw_semaphore rwsem;
183#endif /* CONFIG_NFS_V4*/
1da177e4
LT		 184 struct inode vfs_inode;
185};
186
187/*
55296809 188 * Cache validity bit flags
1da177e4 189 */
55296809
CL		 190#define NFS_INO_INVALID_ATTR 0x0001 /* cached attrs are invalid */
191#define NFS_INO_INVALID_DATA 0x0002 /* cached data is invalid */
192#define NFS_INO_INVALID_ATIME 0x0004 /* cached atime is invalid */
193#define NFS_INO_INVALID_ACCESS 0x0008 /* cached access cred invalid */
194#define NFS_INO_INVALID_ACL 0x0010 /* cached acls are invalid */
195#define NFS_INO_REVAL_PAGECACHE 0x0020 /* must revalidate pagecache */
196
197/*
412d582e 198 * Bit offsets in flags field
55296809 199 */
412d582e
CL		 200#define NFS_INO_REVALIDATING (0) /* revalidating attrs */
201#define NFS_INO_ADVISE_RDPLUS (1) /* advise readdirplus */
202#define NFS_INO_STALE (2) /* possible stale inode */
1da177e4
LT		 203
204static inline struct nfs_inode *NFS_I(struct inode *inode)
205{
206 return container_of(inode, struct nfs_inode, vfs_inode);
207}
208#define NFS_SB(s) ((struct nfs_server *)(s->s_fs_info))
209
210#define NFS_FH(inode) (&NFS_I(inode)->fh)
211#define NFS_SERVER(inode) (NFS_SB(inode->i_sb))
212#define NFS_CLIENT(inode) (NFS_SERVER(inode)->client)
213#define NFS_PROTO(inode) (NFS_SERVER(inode)->rpc_ops)
214#define NFS_ADDR(inode) (RPC_PEERADDR(NFS_CLIENT(inode)))
215#define NFS_COOKIEVERF(inode) (NFS_I(inode)->cookieverf)
216#define NFS_READTIME(inode) (NFS_I(inode)->read_cache_jiffies)
217#define NFS_CHANGE_ATTR(inode) (NFS_I(inode)->change_attr)
218#define NFS_ATTRTIMEO(inode) (NFS_I(inode)->attrtimeo)
219#define NFS_MINATTRTIMEO(inode) \
220 (S_ISDIR(inode->i_mode)? NFS_SERVER(inode)->acdirmin \
221 : NFS_SERVER(inode)->acregmin)
222#define NFS_MAXATTRTIMEO(inode) \
223 (S_ISDIR(inode->i_mode)? NFS_SERVER(inode)->acdirmax \
224 : NFS_SERVER(inode)->acregmax)
225#define NFS_ATTRTIMEO_UPDATE(inode) (NFS_I(inode)->attrtimeo_timestamp)
226
227#define NFS_FLAGS(inode) (NFS_I(inode)->flags)
412d582e 228#define NFS_STALE(inode) (test_bit(NFS_INO_STALE, &NFS_FLAGS(inode)))
1da177e4
LT		 229
230#define NFS_FILEID(inode) (NFS_I(inode)->fileid)
231
232static inline int nfs_caches_unstable(struct inode *inode)
233{
234 return atomic_read(&NFS_I(inode)->data_updates) != 0;
235}
236
decf491f
TM		 237static inline void nfs_mark_for_revalidate(struct inode *inode)
238{
239 spin_lock(&inode->i_lock);
240 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS;
241 spin_unlock(&inode->i_lock);
242}
243
1da177e4
LT		 244static inline void NFS_CACHEINV(struct inode *inode)
245{
decf491f
TM		 246 if (!nfs_caches_unstable(inode))
247 nfs_mark_for_revalidate(inode);
1da177e4
LT		 248}
249
250static inline int nfs_server_capable(struct inode *inode, int cap)
251{
252 return NFS_SERVER(inode)->caps & cap;
253}
254
255static inline int NFS_USE_READDIRPLUS(struct inode *inode)
256{
412d582e 257 return test_bit(NFS_INO_ADVISE_RDPLUS, &NFS_FLAGS(inode));
1da177e4
LT		 258}
259
260/**
261 * nfs_save_change_attribute - Returns the inode attribute change cookie
262 * @inode - pointer to inode
263 * The "change attribute" is updated every time we finish an operation
264 * that will result in a metadata change on the server.
265 */
266static inline long nfs_save_change_attribute(struct inode *inode)
267{
268 return NFS_I(inode)->cache_change_attribute;
269}
270
271/**
272 * nfs_verify_change_attribute - Detects NFS inode cache updates
273 * @inode - pointer to inode
274 * @chattr - previously saved change attribute
275 * Return "false" if metadata has been updated (or is in the process of
276 * being updated) since the change attribute was saved.
277 */
278static inline int nfs_verify_change_attribute(struct inode *inode, unsigned long chattr)
279{
280 return !nfs_caches_unstable(inode)
913a70fc 281 && time_after_eq(chattr, NFS_I(inode)->cache_change_attribute);
1da177e4
LT		 282}
283
284/*
285 * linux/fs/nfs/inode.c
286 */
29884df0 287extern int nfs_sync_mapping(struct address_space *mapping);
1da177e4
LT		 288extern void nfs_zap_caches(struct inode *);
289extern struct inode *nfs_fhget(struct super_block *, struct nfs_fh *,
290 struct nfs_fattr *);
291extern int nfs_refresh_inode(struct inode *, struct nfs_fattr *);
decf491f 292extern int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr);
1da177e4
LT		 293extern int nfs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
294extern int nfs_permission(struct inode *, int, struct nameidata *);
295extern int nfs_access_get_cached(struct inode *, struct rpc_cred *, struct nfs_access_entry *);
296extern void nfs_access_add_cache(struct inode *, struct nfs_access_entry *);
297extern int nfs_open(struct inode *, struct file *);
298extern int nfs_release(struct inode *, struct file *);
299extern int nfs_attribute_timeout(struct inode *inode);
300extern int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode);
301extern int __nfs_revalidate_inode(struct nfs_server *, struct inode *);
7d52e862 302extern void nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping);
1da177e4 303extern int nfs_setattr(struct dentry *, struct iattr *);
65e4308d 304extern void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr);
1da177e4
LT		 305extern void nfs_begin_attr_update(struct inode *);
306extern void nfs_end_attr_update(struct inode *);
307extern void nfs_begin_data_update(struct inode *);
308extern void nfs_end_data_update(struct inode *);
1da177e4
LT		 309extern struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx);
310extern void put_nfs_open_context(struct nfs_open_context *ctx);
d530838b 311extern struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, int mode);
1da177e4
LT		 312
313/* linux/net/ipv4/ipconfig.c: trims ip addr off front of name, too. */
314extern u32 root_nfs_parse_addr(char *name); /*__init*/
315
0e574af1
TM		 316static inline void nfs_fattr_init(struct nfs_fattr *fattr)
317{
318 fattr->valid = 0;
33801147 319 fattr->time_start = jiffies;
0e574af1
TM		 320}
321
1da177e4
LT		 322/*
323 * linux/fs/nfs/file.c
324 */
325extern struct inode_operations nfs_file_inode_operations;
b7fa0554
AG		 326#ifdef CONFIG_NFS_V3
327extern struct inode_operations nfs3_file_inode_operations;
328#endif /* CONFIG_NFS_V3 */
1da177e4
LT		 329extern struct file_operations nfs_file_operations;
330extern struct address_space_operations nfs_file_aops;
331
332static inline struct rpc_cred *nfs_file_cred(struct file *file)
333{
334 if (file != NULL) {
335 struct nfs_open_context *ctx;
336
337 ctx = (struct nfs_open_context*)file->private_data;
338 return ctx->cred;
339 }
340 return NULL;
341}
342
b7fa0554
AG		 343/*
344 * linux/fs/nfs/xattr.c
345 */
346#ifdef CONFIG_NFS_V3_ACL
347extern ssize_t nfs3_listxattr(struct dentry *, char *, size_t);
348extern ssize_t nfs3_getxattr(struct dentry *, const char *, void *, size_t);
349extern int nfs3_setxattr(struct dentry *, const char *,
350 const void *, size_t, int);
351extern int nfs3_removexattr (struct dentry *, const char *name);
352#else
353# define nfs3_listxattr NULL
354# define nfs3_getxattr NULL
355# define nfs3_setxattr NULL
356# define nfs3_removexattr NULL
357#endif
358
1da177e4
LT		 359/*
360 * linux/fs/nfs/direct.c
361 */
362extern ssize_t nfs_direct_IO(int, struct kiocb *, const struct iovec *, loff_t,
363 unsigned long);
364extern ssize_t nfs_file_direct_read(struct kiocb *iocb, char __user *buf,
365 size_t count, loff_t pos);
366extern ssize_t nfs_file_direct_write(struct kiocb *iocb, const char __user *buf,
367 size_t count, loff_t pos);
368
369/*
370 * linux/fs/nfs/dir.c
371 */
372extern struct inode_operations nfs_dir_inode_operations;
b7fa0554
AG		 373#ifdef CONFIG_NFS_V3
374extern struct inode_operations nfs3_dir_inode_operations;
375#endif /* CONFIG_NFS_V3 */
1da177e4
LT		 376extern struct file_operations nfs_dir_operations;
377extern struct dentry_operations nfs_dentry_operations;
378
379extern int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fh, struct nfs_fattr *fattr);
380
381/*
382 * linux/fs/nfs/symlink.c
383 */
384extern struct inode_operations nfs_symlink_inode_operations;
385
a72b4422
TM		 386/*
387 * linux/fs/nfs/sysctl.c
388 */
389#ifdef CONFIG_SYSCTL
390extern int nfs_register_sysctl(void);
391extern void nfs_unregister_sysctl(void);
392#else
7fd105e7 393#define nfs_register_sysctl() 0
a72b4422
TM		 394#define nfs_unregister_sysctl() do { } while(0)
395#endif
396
1da177e4
LT		 397/*
398 * linux/fs/nfs/unlink.c
399 */
400extern int nfs_async_unlink(struct dentry *);
401extern void nfs_complete_unlink(struct dentry *);
402
403/*
404 * linux/fs/nfs/write.c
405 */
406extern int nfs_writepage(struct page *page, struct writeback_control *wbc);
407extern int nfs_writepages(struct address_space *, struct writeback_control *);
408extern int nfs_flush_incompatible(struct file *file, struct page *page);
409extern int nfs_updatepage(struct file *, struct page *, unsigned int, unsigned int);
1da177e4
LT		 410
411/*
412 * Try to write back everything synchronously (but check the
413 * return value!)
414 */
415extern int nfs_sync_inode(struct inode *, unsigned long, unsigned int, int);
416#if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
3da28eb1 417extern int nfs_commit_inode(struct inode *, int);
1da177e4
LT		 418#else
419static inline int
3da28eb1 420nfs_commit_inode(struct inode *inode, int how)
1da177e4
LT		 421{
422 return 0;
423}
424#endif
425
426static inline int
427nfs_have_writebacks(struct inode *inode)
428{
429 return NFS_I(inode)->npages != 0;
430}
431
432static inline int
433nfs_wb_all(struct inode *inode)
434{
435 int error = nfs_sync_inode(inode, 0, 0, FLUSH_WAIT);
436 return (error < 0) ? error : 0;
437}
438
439/*
440 * Write back all requests on one page - we do this before reading it.
441 */
442static inline int nfs_wb_page_priority(struct inode *inode, struct page* page, int how)
443{
444 int error = nfs_sync_inode(inode, page->index, 1,
445 how | FLUSH_WAIT | FLUSH_STABLE);
446 return (error < 0) ? error : 0;
447}
448
449static inline int nfs_wb_page(struct inode *inode, struct page* page)
450{
451 return nfs_wb_page_priority(inode, page, 0);
452}
453
454/*
455 * Allocate and free nfs_write_data structures
456 */
457extern mempool_t *nfs_wdata_mempool;
458
40859d7e 459static inline struct nfs_write_data *nfs_writedata_alloc(unsigned int pagecount)
1da177e4
LT		 460{
461 struct nfs_write_data *p = mempool_alloc(nfs_wdata_mempool, SLAB_NOFS);
40859d7e 462
1da177e4
LT		 463 if (p) {
464 memset(p, 0, sizeof(*p));
465 INIT_LIST_HEAD(&p->pages);
40859d7e
CL		 466 if (pagecount < NFS_PAGEVEC_SIZE)
467 p->pagevec = &p->page_array[0];
468 else {
469 size_t size = ++pagecount * sizeof(struct page *);
470 p->pagevec = kmalloc(size, GFP_NOFS);
471 if (p->pagevec) {
472 memset(p->pagevec, 0, size);
473 } else {
474 mempool_free(p, nfs_wdata_mempool);
475 p = NULL;
476 }
477 }
1da177e4
LT		 478 }
479 return p;
480}
481
482static inline void nfs_writedata_free(struct nfs_write_data *p)
483{
40859d7e
CL		 484 if (p && (p->pagevec != &p->page_array[0]))
485 kfree(p->pagevec);
1da177e4
LT		 486 mempool_free(p, nfs_wdata_mempool);
487}
488
1da177e4
LT		 489/*
490 * linux/fs/nfs/read.c
491 */
492extern int nfs_readpage(struct file *, struct page *);
493extern int nfs_readpages(struct file *, struct address_space *,
494 struct list_head *, unsigned);
963d8fe5
TM		 495extern void nfs_readpage_result(struct rpc_task *, void *);
496extern void nfs_readdata_release(void *data);
497
1da177e4
LT		 498
499/*
500 * Allocate and free nfs_read_data structures
501 */
502extern mempool_t *nfs_rdata_mempool;
503
40859d7e 504static inline struct nfs_read_data *nfs_readdata_alloc(unsigned int pagecount)
1da177e4
LT		 505{
506 struct nfs_read_data *p = mempool_alloc(nfs_rdata_mempool, SLAB_NOFS);
40859d7e
CL		 507
508 if (p) {
1da177e4 509 memset(p, 0, sizeof(*p));
40859d7e
CL		 510 INIT_LIST_HEAD(&p->pages);
511 if (pagecount < NFS_PAGEVEC_SIZE)
512 p->pagevec = &p->page_array[0];
513 else {
514 size_t size = ++pagecount * sizeof(struct page *);
515 p->pagevec = kmalloc(size, GFP_NOFS);
516 if (p->pagevec) {
517 memset(p->pagevec, 0, size);
518 } else {
519 mempool_free(p, nfs_rdata_mempool);
520 p = NULL;
521 }
522 }
523 }
1da177e4
LT		 524 return p;
525}
526
527static inline void nfs_readdata_free(struct nfs_read_data *p)
528{
40859d7e
CL		 529 if (p && (p->pagevec != &p->page_array[0]))
530 kfree(p->pagevec);
1da177e4
LT		 531 mempool_free(p, nfs_rdata_mempool);
532}
533
b7fa0554
AG		 534/*
535 * linux/fs/nfs3proc.c
536 */
537#ifdef CONFIG_NFS_V3_ACL
538extern struct posix_acl *nfs3_proc_getacl(struct inode *inode, int type);
539extern int nfs3_proc_setacl(struct inode *inode, int type,
540 struct posix_acl *acl);
055ffbea
AG		 541extern int nfs3_proc_set_default_acl(struct inode *dir, struct inode *inode,
542 mode_t mode);
5c6a9f7d 543extern void nfs3_forget_cached_acls(struct inode *inode);
055ffbea
AG		 544#else
545static inline int nfs3_proc_set_default_acl(struct inode *dir,
546 struct inode *inode,
547 mode_t mode)
548{
549 return 0;
550}
5c6a9f7d
AG		 551
552static inline void nfs3_forget_cached_acls(struct inode *inode)
553{
554}
b7fa0554
AG		 555#endif /* CONFIG_NFS_V3_ACL */
556
1da177e4
LT		 557/*
558 * linux/fs/mount_clnt.c
559 * (Used only by nfsroot module)
560 */
561extern int nfsroot_mount(struct sockaddr_in *, char *, struct nfs_fh *,
562 int, int);
563
564/*
565 * inline functions
566 */
567
568static inline loff_t
569nfs_size_to_loff_t(__u64 size)
570{
571 loff_t maxsz = (((loff_t) ULONG_MAX) << PAGE_CACHE_SHIFT) + PAGE_CACHE_SIZE - 1;
572 if (size > maxsz)
573 return maxsz;
574 return (loff_t) size;
575}
576
577static inline ino_t
578nfs_fileid_to_ino_t(u64 fileid)
579{
580 ino_t ino = (ino_t) fileid;
581 if (sizeof(ino_t) < sizeof(u64))
582 ino ^= fileid >> (sizeof(u64)-sizeof(ino_t)) * 8;
583 return ino;
584}
585
586/* NFS root */
587
588extern void * nfs_root_data(void);
589
590#define nfs_wait_event(clnt, wq, condition) \
591({ \
592 int __retval = 0; \
593 if (clnt->cl_intr) { \
594 sigset_t oldmask; \
595 rpc_clnt_sigmask(clnt, &oldmask); \
596 __retval = wait_event_interruptible(wq, condition); \
597 rpc_clnt_sigunmask(clnt, &oldmask); \
598 } else \
599 wait_event(wq, condition); \
600 __retval; \
601})
602
603#define NFS_JUKEBOX_RETRY_TIME (5 * HZ)
604
1da177e4
LT		 605#endif /* __KERNEL__ */
606
607/*
608 * NFS debug flags
609 */
610#define NFSDBG_VFS 0x0001
611#define NFSDBG_DIRCACHE 0x0002
612#define NFSDBG_LOOKUPCACHE 0x0004
613#define NFSDBG_PAGECACHE 0x0008
614#define NFSDBG_PROC 0x0010
615#define NFSDBG_XDR 0x0020
616#define NFSDBG_FILE 0x0040
617#define NFSDBG_ROOT 0x0080
618#define NFSDBG_CALLBACK 0x0100
619#define NFSDBG_ALL 0xFFFF
620
621#ifdef __KERNEL__
622# undef ifdebug
623# ifdef NFS_DEBUG
624# define ifdebug(fac) if (unlikely(nfs_debug & NFSDBG_##fac))
625# else
626# define ifdebug(fac) if (0)
627# endif
628#endif /* __KERNEL */
629
630#endif
Linux kernel - Deliverables
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