4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
23 * Copyright (C) 2011 Lawrence Livermore National Security, LLC.
24 * Copyright (C) 2015 Jörg Thalheim.
30 #include <sys/taskq.h>
32 #include <linux/backing-dev.h>
36 * Added insert_inode_locked() helper function, prior to this most callers
37 * used insert_inode_hash(). The older method doesn't check for collisions
38 * in the inode_hashtable but it still acceptible for use.
40 #ifndef HAVE_INSERT_INODE_LOCKED
42 insert_inode_locked(struct inode *ip)
44 insert_inode_hash(ip);
47 #endif /* HAVE_INSERT_INODE_LOCKED */
51 * Add truncate_setsize() if it is not exported by the Linux kernel.
53 * Truncate the inode and pages associated with the inode. The pages are
54 * unmapped and removed from cache.
56 #ifndef HAVE_TRUNCATE_SETSIZE
58 truncate_setsize(struct inode *ip, loff_t new)
60 struct address_space *mapping = ip->i_mapping;
62 i_size_write(ip, new);
64 unmap_mapping_range(mapping, new + PAGE_SIZE - 1, 0, 1);
65 truncate_inode_pages(mapping, new);
66 unmap_mapping_range(mapping, new + PAGE_SIZE - 1, 0, 1);
68 #endif /* HAVE_TRUNCATE_SETSIZE */
71 * 2.6.32 - 2.6.33, bdi_setup_and_register() is not available.
72 * 2.6.34 - 3.19, bdi_setup_and_register() takes 3 arguments.
73 * 4.0 - x.y, bdi_setup_and_register() takes 2 arguments.
75 #if defined(HAVE_2ARGS_BDI_SETUP_AND_REGISTER)
77 zpl_bdi_setup_and_register(struct backing_dev_info *bdi, char *name)
79 return (bdi_setup_and_register(bdi, name));
81 #elif defined(HAVE_3ARGS_BDI_SETUP_AND_REGISTER)
83 zpl_bdi_setup_and_register(struct backing_dev_info *bdi, char *name)
85 return (bdi_setup_and_register(bdi, name, BDI_CAP_MAP_COPY));
88 extern atomic_long_t zfs_bdi_seq;
91 zpl_bdi_setup_and_register(struct backing_dev_info *bdi, char *name)
97 bdi->capabilities = BDI_CAP_MAP_COPY;
99 error = bdi_init(bdi);
103 sprintf(tmp, "%.28s%s", name, "-%d");
104 error = bdi_register(bdi, NULL, tmp,
105 atomic_long_inc_return(&zfs_bdi_seq));
117 * LOOKUP_RCU flag introduced to distinguish rcu-walk from ref-walk cases.
120 #define LOOKUP_RCU 0x0
121 #endif /* LOOKUP_RCU */
124 * 3.2-rc1 API change,
125 * Add set_nlink() if it is not exported by the Linux kernel.
127 * i_nlink is read-only in Linux 3.2, but it can be set directly in
130 #ifndef HAVE_SET_NLINK
132 set_nlink(struct inode *inode, unsigned int nlink)
134 inode->i_nlink = nlink;
136 #endif /* HAVE_SET_NLINK */
140 * The VFS .create, .mkdir and .mknod callbacks were updated to take a
141 * umode_t type rather than an int. To cleanly handle both definitions
142 * the zpl_umode_t type is introduced and set accordingly.
144 #ifdef HAVE_MKDIR_UMODE_T
145 typedef umode_t zpl_umode_t;
147 typedef int zpl_umode_t;
152 * The clear_inode() function replaces end_writeback() and introduces an
153 * ordering change regarding when the inode_sync_wait() occurs. See the
154 * configure check in config/kernel-clear-inode.m4 for full details.
156 #if defined(HAVE_EVICT_INODE) && !defined(HAVE_CLEAR_INODE)
157 #define clear_inode(ip) end_writeback(ip)
158 #endif /* HAVE_EVICT_INODE && !HAVE_CLEAR_INODE */
162 * The sget() helper function now takes the mount flags as an argument.
164 #ifdef HAVE_5ARG_SGET
165 #define zpl_sget(type, cmp, set, fl, mtd) sget(type, cmp, set, fl, mtd)
167 #define zpl_sget(type, cmp, set, fl, mtd) sget(type, cmp, set, mtd)
168 #endif /* HAVE_5ARG_SGET */
170 #if defined(SEEK_HOLE) && defined(SEEK_DATA) && !defined(HAVE_LSEEK_EXECUTE)
178 if (offset < 0 && !(filp->f_mode & FMODE_UNSIGNED_OFFSET))
181 if (offset > maxsize)
184 if (offset != filp->f_pos) {
185 spin_lock(&filp->f_lock);
186 filp->f_pos = offset;
188 spin_unlock(&filp->f_lock);
193 #endif /* SEEK_HOLE && SEEK_DATA && !HAVE_LSEEK_EXECUTE */
195 #if defined(CONFIG_FS_POSIX_ACL)
197 * These functions safely approximates the behavior of posix_acl_release()
198 * which cannot be used because it calls the GPL-only symbol kfree_rcu().
199 * The in-kernel version, which can access the RCU, frees the ACLs after
200 * the grace period expires. Because we're unsure how long that grace
201 * period may be this implementation conservatively delays for 60 seconds.
202 * This is several orders of magnitude larger than expected grace period.
203 * At 60 seconds the kernel will also begin issuing RCU stall warnings.
205 #include <linux/posix_acl.h>
207 #if defined(HAVE_POSIX_ACL_RELEASE) && !defined(HAVE_POSIX_ACL_RELEASE_GPL_ONLY)
208 #define zpl_posix_acl_release(arg) posix_acl_release(arg)
210 void zpl_posix_acl_release_impl(struct posix_acl *);
213 zpl_posix_acl_release(struct posix_acl *acl)
215 if ((acl == NULL) || (acl == ACL_NOT_CACHED))
218 if (atomic_dec_and_test(&acl->a_refcount))
219 zpl_posix_acl_release_impl(acl);
221 #endif /* HAVE_POSIX_ACL_RELEASE */
223 #ifdef HAVE_SET_CACHED_ACL_USABLE
224 #define zpl_set_cached_acl(ip, ty, n) set_cached_acl(ip, ty, n)
225 #define zpl_forget_cached_acl(ip, ty) forget_cached_acl(ip, ty)
228 zpl_set_cached_acl(struct inode *ip, int type, struct posix_acl *newer)
230 struct posix_acl *older = NULL;
232 spin_lock(&ip->i_lock);
234 if ((newer != ACL_NOT_CACHED) && (newer != NULL))
235 posix_acl_dup(newer);
238 case ACL_TYPE_ACCESS:
240 rcu_assign_pointer(ip->i_acl, newer);
242 case ACL_TYPE_DEFAULT:
243 older = ip->i_default_acl;
244 rcu_assign_pointer(ip->i_default_acl, newer);
248 spin_unlock(&ip->i_lock);
250 zpl_posix_acl_release(older);
254 zpl_forget_cached_acl(struct inode *ip, int type)
256 zpl_set_cached_acl(ip, type, (struct posix_acl *)ACL_NOT_CACHED);
258 #endif /* HAVE_SET_CACHED_ACL_USABLE */
260 #ifndef HAVE___POSIX_ACL_CHMOD
261 #ifdef HAVE_POSIX_ACL_CHMOD
262 #define __posix_acl_chmod(acl, gfp, mode) posix_acl_chmod(acl, gfp, mode)
263 #define __posix_acl_create(acl, gfp, mode) posix_acl_create(acl, gfp, mode)
266 __posix_acl_chmod(struct posix_acl **acl, int flags, umode_t umode)
268 struct posix_acl *oldacl = *acl;
272 *acl = posix_acl_clone(*acl, flags);
273 zpl_posix_acl_release(oldacl);
278 error = posix_acl_chmod_masq(*acl, mode);
280 zpl_posix_acl_release(*acl);
288 __posix_acl_create(struct posix_acl **acl, int flags, umode_t *umodep)
290 struct posix_acl *oldacl = *acl;
291 mode_t mode = *umodep;
294 *acl = posix_acl_clone(*acl, flags);
295 zpl_posix_acl_release(oldacl);
300 error = posix_acl_create_masq(*acl, &mode);
304 zpl_posix_acl_release(*acl);
310 #endif /* HAVE_POSIX_ACL_CHMOD */
311 #endif /* HAVE___POSIX_ACL_CHMOD */
313 #ifdef HAVE_POSIX_ACL_EQUIV_MODE_UMODE_T
314 typedef umode_t zpl_equivmode_t;
316 typedef mode_t zpl_equivmode_t;
317 #endif /* HAVE_POSIX_ACL_EQUIV_MODE_UMODE_T */
321 * posix_acl_valid() now must be passed a namespace, the namespace from
322 * from super block associated with the given inode is used for this purpose.
324 #ifdef HAVE_POSIX_ACL_VALID_WITH_NS
325 #define zpl_posix_acl_valid(ip, acl) posix_acl_valid(ip->i_sb->s_user_ns, acl)
327 #define zpl_posix_acl_valid(ip, acl) posix_acl_valid(acl)
330 #endif /* CONFIG_FS_POSIX_ACL */
334 * The is_owner_or_cap() function was renamed to inode_owner_or_capable().
336 #ifdef HAVE_INODE_OWNER_OR_CAPABLE
337 #define zpl_inode_owner_or_capable(ip) inode_owner_or_capable(ip)
339 #define zpl_inode_owner_or_capable(ip) is_owner_or_cap(ip)
340 #endif /* HAVE_INODE_OWNER_OR_CAPABLE */
344 * struct access f->f_dentry->d_inode was replaced by accessor function
347 #ifndef HAVE_FILE_INODE
348 static inline struct inode *file_inode(const struct file *f)
350 return (f->f_dentry->d_inode);
352 #endif /* HAVE_FILE_INODE */
356 * struct access file->f_path.dentry was replaced by accessor function
359 #ifndef HAVE_FILE_DENTRY
360 static inline struct dentry *file_dentry(const struct file *f)
362 return (f->f_path.dentry);
364 #endif /* HAVE_FILE_DENTRY */
366 #ifdef HAVE_KUID_HELPERS
367 static inline uid_t zfs_uid_read_impl(struct inode *ip)
369 #ifdef HAVE_SUPER_USER_NS
370 return (from_kuid(ip->i_sb->s_user_ns, ip->i_uid));
372 return (from_kuid(kcred->user_ns, ip->i_uid));
376 static inline uid_t zfs_uid_read(struct inode *ip)
378 return (zfs_uid_read_impl(ip));
381 static inline gid_t zfs_gid_read_impl(struct inode *ip)
383 #ifdef HAVE_SUPER_USER_NS
384 return (from_kgid(ip->i_sb->s_user_ns, ip->i_gid));
386 return (from_kgid(kcred->user_ns, ip->i_gid));
390 static inline gid_t zfs_gid_read(struct inode *ip)
392 return (zfs_gid_read_impl(ip));
395 static inline void zfs_uid_write(struct inode *ip, uid_t uid)
397 #ifdef HAVE_SUPER_USER_NS
398 ip->i_uid = make_kuid(ip->i_sb->s_user_ns, uid);
400 ip->i_uid = make_kuid(kcred->user_ns, uid);
404 static inline void zfs_gid_write(struct inode *ip, gid_t gid)
406 #ifdef HAVE_SUPER_USER_NS
407 ip->i_gid = make_kgid(ip->i_sb->s_user_ns, gid);
409 ip->i_gid = make_kgid(kcred->user_ns, gid);
414 static inline uid_t zfs_uid_read(struct inode *ip)
419 static inline gid_t zfs_gid_read(struct inode *ip)
424 static inline void zfs_uid_write(struct inode *ip, uid_t uid)
429 static inline void zfs_gid_write(struct inode *ip, gid_t gid)
438 #ifdef HAVE_FOLLOW_DOWN_ONE
439 #define zpl_follow_down_one(path) follow_down_one(path)
440 #define zpl_follow_up(path) follow_up(path)
442 #define zpl_follow_down_one(path) follow_down(path)
443 #define zpl_follow_up(path) follow_up(path)
449 #ifndef HAVE_SETATTR_PREPARE
451 setattr_prepare(struct dentry *dentry, struct iattr *ia)
453 return (inode_change_ok(dentry->d_inode, ia));
457 #endif /* _ZFS_VFS_H */