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 #ifndef HAVE_LINUX_DO_SYNC_READ
18 do_sync_read(struct file *fp, char *buf, size_t count, loff_t *offp) {
19 return generic_file_read(fp, buf, count, offp);
23 do_sync_write(struct file *fp, char *buf, size_t count, loff_t *offp) {
24 return generic_file_write(fp, buf, count, offp);
27 #endif /* DO_SYNC_READ */
30 afs_posix_lock_file(struct file *fp, struct file_lock *flp) {
31 #ifdef POSIX_LOCK_FILE_WAIT_ARG
32 return posix_lock_file(fp, flp, NULL);
34 flp->fl_flags &=~ FL_SLEEP;
35 return posix_lock_file(fp, flp);
40 afs_posix_test_lock(struct file *fp, struct file_lock *flp) {
41 #if defined(POSIX_TEST_LOCK_CONFLICT_ARG)
42 struct file_lock conflict;
43 if (posix_test_lock(fp, flp, &conflict)) {
44 locks_copy_lock(flp, &conflict);
45 flp->fl_type = F_UNLCK;
47 #elif defined(POSIX_TEST_LOCK_RETURNS_CONFLICT)
48 struct file_lock *conflict;
49 conflict = posix_test_lock(fp, flp);
51 locks_copy_lock(flp, conflict);
52 flp->fl_type = F_UNLCK;
55 posix_test_lock(fp, flp);
59 #ifdef DCACHE_NFSFS_RENAMED
61 afs_linux_clear_nfsfs_renamed(struct dentry *dp) {
62 spin_lock(&dp->d_lock);
63 dp->d_flags &= ~DCACHE_NFSFS_RENAMED;
64 spin_unlock(&dp->d_lock);
68 afs_linux_set_nfsfs_renamed(struct dentry *dp) {
69 spin_lock(&dp->d_lock);
70 dp->d_flags |= DCACHE_NFSFS_RENAMED;
71 spin_unlock(&dp->d_lock);
75 afs_linux_nfsfs_renamed(struct dentry *dp) {
76 return dp->d_flags & DCACHE_NFSFS_RENAMED;
80 static inline void afs_linux_clear_nfsfs_renamed(void) { return; }
81 static inline void afs_linux_set_nfsfs_renamed(void) { return; }
84 #ifndef HAVE_LINUX_HLIST_UNHASHED
86 hlist_unhashed(const struct hlist_node *h) {
87 return (!h->pprev == NULL);
91 #if defined(WRITEPAGE_ACTIVATE)
92 #define AOP_WRITEPAGE_ACTIVATE WRITEPAGE_ACTIVATE
95 #if defined(STRUCT_ADDRESS_SPACE_OPERATIONS_HAS_WRITE_BEGIN) && !defined(HAVE_LINUX_GRAB_CACHE_PAGE_WRITE_BEGIN)
96 static inline struct page *
97 grab_cache_page_write_begin(struct address_space *mapping, pgoff_t index,
99 return __grab_cache_page(mapping, index);
103 #if defined(HAVE_KMEM_CACHE_T)
104 #define afs_kmem_cache_t kmem_cache_t
106 #define afs_kmem_cache_t struct kmem_cache
109 extern void init_once(void *);
110 #if defined(HAVE_KMEM_CACHE_T)
112 init_once_func(void * foo, kmem_cache_t * cachep, unsigned long flags) {
113 #if defined(SLAB_CTOR_VERIFY)
114 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
115 SLAB_CTOR_CONSTRUCTOR)
119 #elif defined(KMEM_CACHE_INIT)
121 init_once_func(struct kmem_cache * cachep, void * foo) {
124 #elif !defined(KMEM_CACHE_CTOR_TAKES_VOID)
126 init_once_func(void * foo, struct kmem_cache * cachep, unsigned long flags) {
127 #if defined(SLAB_CTOR_VERIFY)
128 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
129 SLAB_CTOR_CONSTRUCTOR)
135 init_once_func(void * foo) {
140 #ifndef SLAB_RECLAIM_ACCOUNT
141 #define SLAB_RECLAIM_ACCOUNT 0
144 #if defined(SLAB_KERNEL)
145 #define KALLOC_TYPE SLAB_KERNEL
147 #define KALLOC_TYPE GFP_KERNEL
150 static inline struct key *
151 afs_linux_key_alloc(struct key_type *type, const char *desc, uid_t uid,
152 gid_t gid, key_perm_t perm, unsigned long flags)
154 #if defined(KEY_ALLOC_NEEDS_STRUCT_TASK)
155 return key_alloc(type, desc, uid, gid, current, perm, flags);
156 #elif defined(KEY_ALLOC_NEEDS_CRED)
157 return key_alloc(type, desc, uid, gid, current_cred(), perm, flags);
159 return key_alloc(type, desc, uid, gid, perm, flags);
163 #if defined(STRUCT_TASK_STRUCT_HAS_CRED)
164 static inline struct key*
165 afs_linux_search_keyring(afs_ucred_t *cred, struct key_type *type)
169 if (cred->tgcred->session_keyring) {
170 key_ref = keyring_search(
171 make_key_ref(cred->tgcred->session_keyring, 1),
174 return ERR_CAST(key_ref);
176 return key_ref_to_ptr(key_ref);
179 return ERR_PTR(-ENOKEY);
183 afs_linux_cred_is_current(afs_ucred_t *cred)
185 return (cred == current_cred());
189 static inline struct key*
190 afs_linux_search_keyring(afs_ucred_t *cred, struct key_type *type)
192 return request_key(type, "_pag", NULL);
196 afs_linux_cred_is_current(afs_ucred_t *cred)
202 #ifdef LINUX_KEYRING_SUPPORT
203 # ifndef KEY_ALLOC_NOT_IN_QUOTA
204 # define KEY_ALLOC_NOT_IN_QUOTA 1
206 # ifndef KEY_ALLOC_IN_QUOTA
207 # define KEY_ALLOC_IN_QUOTA 0
212 #ifndef HAVE_LINUX_PAGE_OFFSET
214 page_offset(struct page *pp)
216 return (((loff_t) pp->index) << PAGE_CACHE_SHIFT);
220 #ifndef HAVE_LINUX_ZERO_USER_SEGMENTS
222 zero_user_segments(struct page *pp, unsigned int from1, unsigned int to1,
223 unsigned int from2, unsigned int to2)
225 void *base = kmap_atomic(pp, KM_USER0);
228 memset(base + from1, 0, to1 - from1);
231 memset(base + from2, 0, to2 - from2);
233 flush_dcache_page(pp);
234 kunmap_atomic(base, KM_USER0);
238 zero_user_segment(struct page *pp, unsigned int from1, unsigned int to1)
240 zero_user_segments(pp, from1, to1, 0, 0);
244 #ifndef HAVE_LINUX_KERNEL_SETSOCKOPT
245 /* Available from 2.6.19 */
248 kernel_setsockopt(struct socket *sockp, int level, int name, char *val,
250 mm_segment_t old_fs = get_fs();
254 ret = sockp->ops->setsockopt(sockp, level, name, val, len);
261 kernel_getsockopt(struct socket *sockp, int level, int name, char *val,
263 mm_segment_t old_fs = get_fs();
267 ret = sockp->ops->getsockopt(sockp, level, name, val, len);
274 #ifdef HAVE_TRY_TO_FREEZE
276 afs_try_to_freeze(void) {
277 # ifdef LINUX_REFRIGERATOR_TAKES_PF_FREEZE
278 try_to_freeze(PF_FREEZE);
285 afs_try_to_freeze(void) {
287 if (current->flags & PF_FREEZE) {
288 refrigerator(PF_FREEZE);
294 #if !defined(HAVE_LINUX_PAGECHECKED)
295 # if defined(HAVE_LINUX_PAGEFSMISC)
296 # include <linux/page-flags.h>
298 # define PageChecked(p) PageFsMisc((p))
299 # define SetPageChecked(p) SetPageFsMisc((p))
300 # define ClearPageChecked(p) ClearPageFsMisc((p))
305 #if !defined(NEW_EXPORT_OPS)
306 extern struct export_operations export_op_default;
309 static inline struct dentry *
310 afs_get_dentry_from_fh(struct super_block *afs_cacheSBp, afs_dcache_id_t *ainode,
311 int cache_fh_len, int cache_fh_type,
312 int (*afs_fh_acceptable)(void *, struct dentry *)) {
313 #if defined(NEW_EXPORT_OPS)
314 return afs_cacheSBp->s_export_op->fh_to_dentry(afs_cacheSBp, &ainode->ufs.fh,
315 cache_fh_len, cache_fh_type);
317 if (afs_cacheSBp->s_export_op && afs_cacheSBp->s_export_op->decode_fh)
318 return afs_cacheSBp->s_export_op->decode_fh(afs_cacheSBp, ainode->ufs.raw,
319 cache_fh_len, cache_fh_type, afs_fh_acceptable, NULL);
321 return export_op_default.decode_fh(afs_cacheSBp, ainode->ufs.raw,
322 cache_fh_len, cache_fh_type, afs_fh_acceptable, NULL);
327 afs_get_fh_from_dentry(struct dentry *dp, afs_ufs_dcache_id_t *ainode, int *max_lenp) {
328 if (dp->d_sb->s_export_op->encode_fh)
329 return dp->d_sb->s_export_op->encode_fh(dp, &ainode->raw[0], max_lenp, 0);
330 #if defined(NEW_EXPORT_OPS)
331 /* If fs doesn't provide an encode_fh method, assume the default INO32 type */
332 *max_lenp = sizeof(struct fid)/4;
333 ainode->fh.i32.ino = dp->d_inode->i_ino;
334 ainode->fh.i32.gen = dp->d_inode->i_generation;
335 return FILEID_INO32_GEN;
337 /* or call the default encoding function for the old API */
338 return export_op_default.encode_fh(dp, &ainode->raw[0], max_lenp, 0);
343 afs_init_sb_export_ops(struct super_block *sb) {
344 #if !defined(NEW_EXPORT_OPS)
346 * decode_fh will call this function. If not defined for this FS, make
347 * sure it points to the default
349 if (!sb->s_export_op->find_exported_dentry) {
350 /* Some kernels (at least 2.6.9) do not prototype find_exported_dentry,
351 * even though it is exported, so prototype it ourselves. Newer
352 * kernels do prototype it, but as long as our protoype matches the
353 * real one (the signature never changed before NEW_EXPORT_OPS came
354 * into play), there should be no problems. */
355 extern struct dentry * find_exported_dentry(struct super_block *sb, void *obj, void *parent,
356 int (*acceptable)(void *context, struct dentry *de),
358 sb->s_export_op->find_exported_dentry = find_exported_dentry;
364 afs_linux_lock_inode(struct inode *ip) {
365 #ifdef STRUCT_INODE_HAS_I_MUTEX
366 mutex_lock(&ip->i_mutex);
373 afs_linux_unlock_inode(struct inode *ip) {
374 #ifdef STRUCT_INODE_HAS_I_MUTEX
375 mutex_unlock(&ip->i_mutex);
382 afs_inode_setattr(struct osi_file *afile, struct iattr *newattrs) {
385 struct inode *inode = OSIFILE_INODE(afile);
386 #if !defined(HAVE_LINUX_INODE_SETATTR)
387 code = inode->i_op->setattr(afile->filp->f_dentry, newattrs);
388 #elif defined(INODE_SETATTR_NOT_VOID)
389 if (inode->i_op && inode->i_op->setattr)
390 code = inode->i_op->setattr(afile->filp->f_dentry, newattrs);
392 code = inode_setattr(inode, newattrs);
394 inode_setattr(inode, newattrs);