1 /* Kernel compatibility routines
3 * This file contains definitions to provide compatibility between different
4 * versions of the Linux kernel. It is an ifdef maze, but the idea is that
5 * by concentrating the horror here, the rest of the tree may remaing a
9 #ifndef AFS_LINUX_OSI_COMPAT_H
10 #define AFS_LINUX_OSI_COMPAT_H
12 #if defined(HAVE_LINUX_FREEZER_H)
13 # include <linux/freezer.h>
16 #if defined(LINUX_KEYRING_SUPPORT)
17 # include <linux/rwsem.h>
18 # include <linux/key.h>
19 # if defined(HAVE_LINUX_KEY_TYPE_H)
20 # include <linux/key-type.h>
22 # ifndef KEY_ALLOC_IN_QUOTA
23 /* Before these flags were added in Linux commit v2.6.18-rc1~816,
24 * key_alloc just took a boolean not_in_quota */
25 # define KEY_ALLOC_IN_QUOTA 0
26 # define KEY_ALLOC_NOT_IN_QUOTA 1
30 #if defined(STRUCT_DENTRY_OPERATIONS_HAS_D_AUTOMOUNT) && !defined(DCACHE_NEED_AUTOMOUNT)
31 # define DCACHE_NEED_AUTOMOUNT DMANAGED_AUTOMOUNT
34 #ifdef HAVE_LINUX_STRUCT_VFS_PATH
35 typedef struct vfs_path afs_linux_path_t;
37 typedef struct path afs_linux_path_t;
40 #ifndef HAVE_LINUX_DO_SYNC_READ
42 do_sync_read(struct file *fp, char *buf, size_t count, loff_t *offp) {
43 return generic_file_read(fp, buf, count, offp);
47 do_sync_write(struct file *fp, char *buf, size_t count, loff_t *offp) {
48 return generic_file_write(fp, buf, count, offp);
51 #endif /* DO_SYNC_READ */
54 afs_posix_lock_file(struct file *fp, struct file_lock *flp) {
55 #ifdef POSIX_LOCK_FILE_WAIT_ARG
56 return posix_lock_file(fp, flp, NULL);
58 flp->fl_flags &=~ FL_SLEEP;
59 return posix_lock_file(fp, flp);
64 afs_posix_test_lock(struct file *fp, struct file_lock *flp) {
65 #if defined(POSIX_TEST_LOCK_CONFLICT_ARG)
66 struct file_lock conflict;
67 if (posix_test_lock(fp, flp, &conflict)) {
68 locks_copy_lock(flp, &conflict);
69 flp->fl_type = F_UNLCK;
71 #elif defined(POSIX_TEST_LOCK_RETURNS_CONFLICT)
72 struct file_lock *conflict;
73 conflict = posix_test_lock(fp, flp);
75 locks_copy_lock(flp, conflict);
76 flp->fl_type = F_UNLCK;
79 posix_test_lock(fp, flp);
83 #ifdef DCACHE_NFSFS_RENAMED
85 afs_linux_clear_nfsfs_renamed(struct dentry *dp) {
86 spin_lock(&dp->d_lock);
87 dp->d_flags &= ~DCACHE_NFSFS_RENAMED;
88 spin_unlock(&dp->d_lock);
92 afs_linux_set_nfsfs_renamed(struct dentry *dp) {
93 spin_lock(&dp->d_lock);
94 dp->d_flags |= DCACHE_NFSFS_RENAMED;
95 spin_unlock(&dp->d_lock);
99 afs_linux_nfsfs_renamed(struct dentry *dp) {
100 return dp->d_flags & DCACHE_NFSFS_RENAMED;
104 static inline void afs_linux_clear_nfsfs_renamed(void) { return; }
105 static inline void afs_linux_set_nfsfs_renamed(void) { return; }
108 #ifndef HAVE_LINUX_HLIST_UNHASHED
110 hlist_unhashed(const struct hlist_node *h) {
111 return (!h->pprev == NULL);
115 #if defined(WRITEPAGE_ACTIVATE)
116 #define AOP_WRITEPAGE_ACTIVATE WRITEPAGE_ACTIVATE
119 #if defined(STRUCT_ADDRESS_SPACE_OPERATIONS_HAS_WRITE_BEGIN) && !defined(HAVE_LINUX_GRAB_CACHE_PAGE_WRITE_BEGIN)
120 static inline struct page *
121 grab_cache_page_write_begin(struct address_space *mapping, pgoff_t index,
122 unsigned int flags) {
123 return __grab_cache_page(mapping, index);
127 #if defined(HAVE_KMEM_CACHE_T)
128 #define afs_kmem_cache_t kmem_cache_t
130 #define afs_kmem_cache_t struct kmem_cache
133 extern void init_once(void *);
134 #if defined(HAVE_KMEM_CACHE_T)
136 init_once_func(void * foo, kmem_cache_t * cachep, unsigned long flags) {
137 #if defined(SLAB_CTOR_VERIFY)
138 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
139 SLAB_CTOR_CONSTRUCTOR)
143 #elif defined(KMEM_CACHE_INIT)
145 init_once_func(struct kmem_cache * cachep, void * foo) {
148 #elif !defined(KMEM_CACHE_CTOR_TAKES_VOID)
150 init_once_func(void * foo, struct kmem_cache * cachep, unsigned long flags) {
151 #if defined(SLAB_CTOR_VERIFY)
152 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
153 SLAB_CTOR_CONSTRUCTOR)
159 init_once_func(void * foo) {
164 #ifndef SLAB_RECLAIM_ACCOUNT
165 #define SLAB_RECLAIM_ACCOUNT 0
168 #if defined(SLAB_KERNEL)
169 #define KALLOC_TYPE SLAB_KERNEL
171 #define KALLOC_TYPE GFP_KERNEL
174 #ifdef LINUX_KEYRING_SUPPORT
175 static inline struct key *
176 afs_linux_key_alloc(struct key_type *type, const char *desc, afs_kuid_t uid,
177 afs_kgid_t gid, key_perm_t perm, unsigned long flags)
179 # if defined(KEY_ALLOC_NEEDS_STRUCT_TASK)
180 return key_alloc(type, desc, uid, gid, current, perm, flags);
181 # elif defined(KEY_ALLOC_NEEDS_CRED) && defined(HAVE_LINUX_KUID_T) && \
182 !defined(STRUCT_KEY_UID_IS_KUID_T)
183 /* In this case, uid and gid are specified relative to
185 return key_alloc(type, desc,
186 from_kuid(afs_current_user_ns(), uid),
187 from_guid(afs_current_user_ns(), gid),
188 current_cred(), perm, flags);
189 # elif defined(KEY_ALLOC_NEEDS_CRED)
190 return key_alloc(type, desc, uid, gid, current_cred(), perm, flags);
192 return key_alloc(type, desc, uid, gid, perm, flags);
196 # if defined(STRUCT_TASK_STRUCT_HAS_CRED)
197 static inline struct key *
198 afs_session_keyring(afs_ucred_t *cred)
200 # if defined(STRUCT_CRED_HAS_SESSION_KEYRING)
201 return cred->session_keyring;
203 return cred->tgcred->session_keyring;
207 static inline struct key*
208 afs_linux_search_keyring(afs_ucred_t *cred, struct key_type *type)
212 if (afs_session_keyring(cred)) {
213 key_ref = keyring_search(
214 make_key_ref(afs_session_keyring(cred), 1),
217 return ERR_CAST(key_ref);
219 return key_ref_to_ptr(key_ref);
222 return ERR_PTR(-ENOKEY);
225 static inline struct key*
226 afs_linux_search_keyring(afs_ucred_t *cred, struct key_type *type)
228 return request_key(type, "_pag", NULL);
230 # endif /* STRUCT_TASK_STRUCT_HAS_CRED */
232 static_inline struct key *
233 afs_set_session_keyring(struct key *keyring)
236 #if defined(STRUCT_CRED_HAS_SESSION_KEYRING)
237 struct cred *new_creds;
238 old = current_session_keyring();
239 new_creds = prepare_creds();
240 rcu_assign_pointer(new_creds->session_keyring, keyring);
241 commit_creds(new_creds);
243 spin_lock_irq(¤t->sighand->siglock);
244 old = task_session_keyring(current);
246 task_session_keyring(current) = keyring;
247 spin_unlock_irq(¤t->sighand->siglock);
251 #endif /* LINUX_KEYRING_SUPPORT */
253 #ifdef STRUCT_TASK_STRUCT_HAS_CRED
255 afs_linux_cred_is_current(afs_ucred_t *cred)
257 return (cred == current_cred());
261 afs_linux_cred_is_current(afs_ucred_t *cred)
267 #ifndef HAVE_LINUX_PAGE_OFFSET
269 page_offset(struct page *pp)
271 return (((loff_t) pp->index) << PAGE_CACHE_SHIFT);
275 #ifndef HAVE_LINUX_ZERO_USER_SEGMENTS
277 zero_user_segments(struct page *pp, unsigned int from1, unsigned int to1,
278 unsigned int from2, unsigned int to2)
280 void *base = kmap_atomic(pp, KM_USER0);
283 memset(base + from1, 0, to1 - from1);
286 memset(base + from2, 0, to2 - from2);
288 flush_dcache_page(pp);
289 kunmap_atomic(base, KM_USER0);
293 zero_user_segment(struct page *pp, unsigned int from1, unsigned int to1)
295 zero_user_segments(pp, from1, to1, 0, 0);
299 #ifndef HAVE_LINUX_KERNEL_SETSOCKOPT
300 /* Available from 2.6.19 */
303 kernel_setsockopt(struct socket *sockp, int level, int name, char *val,
305 mm_segment_t old_fs = get_fs();
309 ret = sockp->ops->setsockopt(sockp, level, name, val, len);
316 kernel_getsockopt(struct socket *sockp, int level, int name, char *val,
318 mm_segment_t old_fs = get_fs();
322 ret = sockp->ops->getsockopt(sockp, level, name, val, len);
329 #ifdef HAVE_TRY_TO_FREEZE
331 afs_try_to_freeze(void) {
332 # ifdef LINUX_REFRIGERATOR_TAKES_PF_FREEZE
333 return try_to_freeze(PF_FREEZE);
335 return try_to_freeze();
340 afs_try_to_freeze(void) {
342 if (current->flags & PF_FREEZE) {
343 refrigerator(PF_FREEZE);
351 /* The commit which changed refrigerator so that it takes no arguments
352 * also added freezing(), so if LINUX_REFRIGERATOR_TAKES_PF_FREEZE is
353 * true, the kernel doesn't have a freezing() function.
355 #ifdef LINUX_REFRIGERATOR_TAKES_PF_FREEZE
357 freezing(struct task_struct *p)
360 return p->flags & PF_FREEZE;
367 #if !defined(HAVE_LINUX_PAGECHECKED)
368 # if defined(HAVE_LINUX_PAGEFSMISC)
369 # include <linux/page-flags.h>
371 # define PageChecked(p) PageFsMisc((p))
372 # define SetPageChecked(p) SetPageFsMisc((p))
373 # define ClearPageChecked(p) ClearPageFsMisc((p))
378 #if !defined(NEW_EXPORT_OPS)
379 extern struct export_operations export_op_default;
382 static inline struct dentry *
383 afs_get_dentry_from_fh(struct super_block *afs_cacheSBp, afs_dcache_id_t *ainode,
384 int cache_fh_len, int cache_fh_type,
385 int (*afs_fh_acceptable)(void *, struct dentry *)) {
386 #if defined(NEW_EXPORT_OPS)
387 return afs_cacheSBp->s_export_op->fh_to_dentry(afs_cacheSBp, &ainode->ufs.fh,
388 cache_fh_len, cache_fh_type);
390 if (afs_cacheSBp->s_export_op && afs_cacheSBp->s_export_op->decode_fh)
391 return afs_cacheSBp->s_export_op->decode_fh(afs_cacheSBp, ainode->ufs.raw,
392 cache_fh_len, cache_fh_type, afs_fh_acceptable, NULL);
394 return export_op_default.decode_fh(afs_cacheSBp, ainode->ufs.raw,
395 cache_fh_len, cache_fh_type, afs_fh_acceptable, NULL);
400 afs_get_fh_from_dentry(struct dentry *dp, afs_ufs_dcache_id_t *ainode, int *max_lenp) {
401 if (dp->d_sb->s_export_op->encode_fh)
402 #if defined(EXPORT_OP_ENCODE_FH_TAKES_INODES)
403 return dp->d_sb->s_export_op->encode_fh(dp->d_inode, &ainode->raw[0], max_lenp, NULL);
405 return dp->d_sb->s_export_op->encode_fh(dp, &ainode->raw[0], max_lenp, 0);
407 #if defined(NEW_EXPORT_OPS)
408 /* If fs doesn't provide an encode_fh method, assume the default INO32 type */
409 *max_lenp = sizeof(struct fid)/4;
410 ainode->fh.i32.ino = dp->d_inode->i_ino;
411 ainode->fh.i32.gen = dp->d_inode->i_generation;
412 return FILEID_INO32_GEN;
414 /* or call the default encoding function for the old API */
415 return export_op_default.encode_fh(dp, &ainode->raw[0], max_lenp, 0);
420 afs_init_sb_export_ops(struct super_block *sb) {
421 #if !defined(NEW_EXPORT_OPS)
423 * decode_fh will call this function. If not defined for this FS, make
424 * sure it points to the default
426 if (!sb->s_export_op->find_exported_dentry) {
427 /* Some kernels (at least 2.6.9) do not prototype find_exported_dentry,
428 * even though it is exported, so prototype it ourselves. Newer
429 * kernels do prototype it, but as long as our protoype matches the
430 * real one (the signature never changed before NEW_EXPORT_OPS came
431 * into play), there should be no problems. */
432 extern struct dentry * find_exported_dentry(struct super_block *sb, void *obj, void *parent,
433 int (*acceptable)(void *context, struct dentry *de),
435 sb->s_export_op->find_exported_dentry = find_exported_dentry;
441 afs_linux_lock_inode(struct inode *ip) {
442 #ifdef STRUCT_INODE_HAS_I_MUTEX
443 mutex_lock(&ip->i_mutex);
450 afs_linux_unlock_inode(struct inode *ip) {
451 #ifdef STRUCT_INODE_HAS_I_MUTEX
452 mutex_unlock(&ip->i_mutex);
459 afs_inode_setattr(struct osi_file *afile, struct iattr *newattrs) {
462 struct inode *inode = OSIFILE_INODE(afile);
463 #if !defined(HAVE_LINUX_INODE_SETATTR)
464 code = inode->i_op->setattr(afile->filp->f_dentry, newattrs);
465 #elif defined(INODE_SETATTR_NOT_VOID)
466 if (inode->i_op && inode->i_op->setattr)
467 code = inode->i_op->setattr(afile->filp->f_dentry, newattrs);
469 code = inode_setattr(inode, newattrs);
471 inode_setattr(inode, newattrs);
476 #if defined(HAVE_LINUX_PATH_LOOKUP)
478 afs_kern_path(char *aname, int flags, struct nameidata *nd) {
479 return path_lookup(aname, flags, nd);
483 afs_kern_path(char *aname, int flags, afs_linux_path_t *path) {
484 return kern_path(aname, flags, path);
489 #if defined(HAVE_LINUX_PATH_LOOKUP)
490 afs_get_dentry_ref(struct nameidata *nd, struct vfsmount **mnt, struct dentry **dpp) {
492 afs_get_dentry_ref(afs_linux_path_t *path, struct vfsmount **mnt, struct dentry **dpp) {
494 #if defined(STRUCT_NAMEIDATA_HAS_PATH)
495 # if defined(HAVE_LINUX_PATH_LOOKUP)
496 *dpp = dget(nd->path.dentry);
498 *mnt = mntget(nd->path.mnt);
501 *dpp = dget(path->dentry);
503 *mnt = mntget(path->mnt);
507 *dpp = dget(nd->dentry);
509 *mnt = mntget(nd->mnt);
514 /* wait_event_freezable appeared with 2.6.24 */
516 /* These implement the original AFS wait behaviour, with respect to the
517 * refrigerator, rather than the behaviour of the current wait_event_freezable
521 #ifndef wait_event_freezable
522 # define wait_event_freezable(waitqueue, condition) \
526 _ret = wait_event_interruptible(waitqueue, \
527 (condition) || freezing(current)); \
528 if (_ret && !freezing(current)) \
530 else if (!(condition)) \
532 } while (afs_try_to_freeze()); \
536 # define wait_event_freezable_timeout(waitqueue, condition, timeout) \
540 _ret = wait_event_interruptible_timeout(waitqueue, \
542 freezing(current)), \
544 } while (afs_try_to_freeze()); \
549 #if defined(STRUCT_TASK_STRUCT_HAS_CRED)
550 static inline struct file *
551 afs_dentry_open(struct dentry *dp, struct vfsmount *mnt, int flags, const struct cred *creds) {
552 #if defined(DENTRY_OPEN_TAKES_PATH)
553 afs_linux_path_t path;
557 /* note that dentry_open will path_get for us */
558 filp = dentry_open(&path, flags, creds);
561 return dentry_open(dget(dp), mntget(mnt), flags, creds);
566 #if !defined(STRUCT_FILENAME_HAS_NAME)
567 typedef char *afs_name_t;
570 afs_name_to_string(afs_name_t s) {
575 afs_putname(afs_name_t name) {
576 putname((char *)name);
579 typedef struct filename *afs_name_t;
582 afs_name_to_string(afs_name_t s) {
583 return (char *)s->name;
587 afs_putname(afs_name_t name) {
588 kmem_cache_free(names_cachep, (void *)name);
593 afs_truncate(struct inode *inode, int len)
596 #if defined(STRUCT_INODE_OPERATIONS_HAS_TRUNCATE)
597 code = vmtruncate(inode, len);
599 code = inode_newsize_ok(inode, len);
601 truncate_setsize(inode, len);
606 static inline struct proc_dir_entry *
607 afs_proc_create(char *name, umode_t mode, struct proc_dir_entry *parent, struct file_operations *fops) {
608 #if defined(HAVE_LINUX_PROC_CREATE)
609 return proc_create(name, mode, parent, fops);
611 struct proc_dir_entry *entry;
612 entry = create_proc_entry(name, mode, parent);
614 entry->proc_fops = fops;
620 afs_dentry_count(struct dentry *dp)
622 #if defined(HAVE_LINUX_D_COUNT)
624 #elif defined(D_COUNT_INT)
627 return atomic_read(&dp->d_count);
632 afs_maybe_shrink_dcache(struct dentry *dp)
634 #if defined(HAVE_LINUX_D_COUNT) || defined(D_COUNT_INT)
635 spin_lock(&dp->d_lock);
636 if (afs_dentry_count(dp) > 1) {
637 spin_unlock(&dp->d_lock);
638 shrink_dcache_parent(dp);
640 spin_unlock(&dp->d_lock);
642 if (afs_dentry_count(dp) > 1)
643 shrink_dcache_parent(dp);
647 #endif /* AFS_LINUX_OSI_COMPAT_H */