/*
* Copyright (C) 2011 Lawrence Livermore National Security, LLC.
+ * Copyright (C) 2015 Jörg Thalheim.
*/
#ifndef _ZFS_VFS_H
-#define _ZFS_VFS_H
+#define _ZFS_VFS_H
+
+#include <sys/taskq.h>
+
+/*
+ * 2.6.28 API change,
+ * Added insert_inode_locked() helper function, prior to this most callers
+ * used insert_inode_hash(). The older method doesn't check for collisions
+ * in the inode_hashtable but it still acceptible for use.
+ */
+#ifndef HAVE_INSERT_INODE_LOCKED
+static inline int
+insert_inode_locked(struct inode *ip)
+{
+ insert_inode_hash(ip);
+ return (0);
+}
+#endif /* HAVE_INSERT_INODE_LOCKED */
/*
* 2.6.35 API change,
- * The dentry argument to the .fsync() vfs hook was deemed unused by
- * all filesystem consumers and dropped. Add a compatibility prototype
- * to ensure correct usage when defining this callback.
+ * Add truncate_setsize() if it is not exported by the Linux kernel.
+ *
+ * Truncate the inode and pages associated with the inode. The pages are
+ * unmapped and removed from cache.
+ */
+#ifndef HAVE_TRUNCATE_SETSIZE
+static inline void
+truncate_setsize(struct inode *ip, loff_t new)
+{
+ struct address_space *mapping = ip->i_mapping;
+
+ i_size_write(ip, new);
+
+ unmap_mapping_range(mapping, new + PAGE_SIZE - 1, 0, 1);
+ truncate_inode_pages(mapping, new);
+ unmap_mapping_range(mapping, new + PAGE_SIZE - 1, 0, 1);
+}
+#endif /* HAVE_TRUNCATE_SETSIZE */
+
+/*
+ * 2.6.32 - 2.6.33, bdi_setup_and_register() is not available.
+ * 2.6.34 - 3.19, bdi_setup_and_register() takes 3 arguments.
+ * 4.0 - x.y, bdi_setup_and_register() takes 2 arguments.
*/
-#ifdef HAVE_2ARGS_FSYNC
-#define ZPL_FSYNC_PROTO(fn, x, y, z) static int fn(struct file *x, int z)
+#if defined(HAVE_2ARGS_BDI_SETUP_AND_REGISTER)
+static inline int
+zpl_bdi_setup_and_register(struct backing_dev_info *bdi, char *name)
+{
+ return (bdi_setup_and_register(bdi, name));
+}
+#elif defined(HAVE_3ARGS_BDI_SETUP_AND_REGISTER)
+static inline int
+zpl_bdi_setup_and_register(struct backing_dev_info *bdi, char *name)
+{
+ return (bdi_setup_and_register(bdi, name, BDI_CAP_MAP_COPY));
+}
#else
-#define ZPL_FSYNC_PROTO(fn, x, y, z) static int fn(struct file *x, \
- struct dentry *y, int z)
+extern atomic_long_t zfs_bdi_seq;
+
+static inline int
+zpl_bdi_setup_and_register(struct backing_dev_info *bdi, char *name)
+{
+ char tmp[32];
+ int error;
+
+ bdi->name = name;
+ bdi->capabilities = BDI_CAP_MAP_COPY;
+
+ error = bdi_init(bdi);
+ if (error)
+ return (error);
+
+ sprintf(tmp, "%.28s%s", name, "-%d");
+ error = bdi_register(bdi, NULL, tmp,
+ atomic_long_inc_return(&zfs_bdi_seq));
+ if (error) {
+ bdi_destroy(bdi);
+ return (error);
+ }
+
+ return (error);
+}
#endif
+/*
+ * 2.6.38 API change,
+ * LOOKUP_RCU flag introduced to distinguish rcu-walk from ref-walk cases.
+ */
+#ifndef LOOKUP_RCU
+#define LOOKUP_RCU 0x0
+#endif /* LOOKUP_RCU */
+
+/*
+ * 3.2-rc1 API change,
+ * Add set_nlink() if it is not exported by the Linux kernel.
+ *
+ * i_nlink is read-only in Linux 3.2, but it can be set directly in
+ * earlier kernels.
+ */
+#ifndef HAVE_SET_NLINK
+static inline void
+set_nlink(struct inode *inode, unsigned int nlink)
+{
+ inode->i_nlink = nlink;
+}
+#endif /* HAVE_SET_NLINK */
+
+/*
+ * 3.3 API change,
+ * The VFS .create, .mkdir and .mknod callbacks were updated to take a
+ * umode_t type rather than an int. To cleanly handle both definitions
+ * the zpl_umode_t type is introduced and set accordingly.
+ */
+#ifdef HAVE_MKDIR_UMODE_T
+typedef umode_t zpl_umode_t;
+#else
+typedef int zpl_umode_t;
+#endif
+
+/*
+ * 3.5 API change,
+ * The clear_inode() function replaces end_writeback() and introduces an
+ * ordering change regarding when the inode_sync_wait() occurs. See the
+ * configure check in config/kernel-clear-inode.m4 for full details.
+ */
+#if defined(HAVE_EVICT_INODE) && !defined(HAVE_CLEAR_INODE)
+#define clear_inode(ip) end_writeback(ip)
+#endif /* HAVE_EVICT_INODE && !HAVE_CLEAR_INODE */
+
+/*
+ * 3.6 API change,
+ * The sget() helper function now takes the mount flags as an argument.
+ */
+#ifdef HAVE_5ARG_SGET
+#define zpl_sget(type, cmp, set, fl, mtd) sget(type, cmp, set, fl, mtd)
+#else
+#define zpl_sget(type, cmp, set, fl, mtd) sget(type, cmp, set, mtd)
+#endif /* HAVE_5ARG_SGET */
+
+#if defined(SEEK_HOLE) && defined(SEEK_DATA) && !defined(HAVE_LSEEK_EXECUTE)
+static inline loff_t
+lseek_execute(
+ struct file *filp,
+ struct inode *inode,
+ loff_t offset,
+ loff_t maxsize)
+{
+ if (offset < 0 && !(filp->f_mode & FMODE_UNSIGNED_OFFSET))
+ return (-EINVAL);
+
+ if (offset > maxsize)
+ return (-EINVAL);
+
+ if (offset != filp->f_pos) {
+ spin_lock(&filp->f_lock);
+ filp->f_pos = offset;
+ filp->f_version = 0;
+ spin_unlock(&filp->f_lock);
+ }
+
+ return (offset);
+}
+#endif /* SEEK_HOLE && SEEK_DATA && !HAVE_LSEEK_EXECUTE */
+
+#if defined(CONFIG_FS_POSIX_ACL)
+/*
+ * These functions safely approximates the behavior of posix_acl_release()
+ * which cannot be used because it calls the GPL-only symbol kfree_rcu().
+ * The in-kernel version, which can access the RCU, frees the ACLs after
+ * the grace period expires. Because we're unsure how long that grace
+ * period may be this implementation conservatively delays for 60 seconds.
+ * This is several orders of magnitude larger than expected grace period.
+ * At 60 seconds the kernel will also begin issuing RCU stall warnings.
+ */
+#include <linux/posix_acl.h>
+#ifndef HAVE_POSIX_ACL_CACHING
+#define ACL_NOT_CACHED ((void *)(-1))
+#endif /* HAVE_POSIX_ACL_CACHING */
+
+#if defined(HAVE_POSIX_ACL_RELEASE) && !defined(HAVE_POSIX_ACL_RELEASE_GPL_ONLY)
+
+#define zpl_posix_acl_release(arg) posix_acl_release(arg)
+#define zpl_set_cached_acl(ip, ty, n) set_cached_acl(ip, ty, n)
+#define zpl_forget_cached_acl(ip, ty) forget_cached_acl(ip, ty)
+
+#else
+
+static inline void
+zpl_posix_acl_free(void *arg) {
+ kfree(arg);
+}
+
+static inline void
+zpl_posix_acl_release(struct posix_acl *acl)
+{
+ if ((acl == NULL) || (acl == ACL_NOT_CACHED))
+ return;
+
+ if (atomic_dec_and_test(&acl->a_refcount)) {
+ taskq_dispatch_delay(system_taskq, zpl_posix_acl_free, acl,
+ TQ_SLEEP, ddi_get_lbolt() + 60*HZ);
+ }
+}
+
+static inline void
+zpl_set_cached_acl(struct inode *ip, int type, struct posix_acl *newer) {
+#ifdef HAVE_POSIX_ACL_CACHING
+ struct posix_acl *older = NULL;
+
+ spin_lock(&ip->i_lock);
+
+ if ((newer != ACL_NOT_CACHED) && (newer != NULL))
+ posix_acl_dup(newer);
+
+ switch (type) {
+ case ACL_TYPE_ACCESS:
+ older = ip->i_acl;
+ rcu_assign_pointer(ip->i_acl, newer);
+ break;
+ case ACL_TYPE_DEFAULT:
+ older = ip->i_default_acl;
+ rcu_assign_pointer(ip->i_default_acl, newer);
+ break;
+ }
+
+ spin_unlock(&ip->i_lock);
+
+ zpl_posix_acl_release(older);
+#endif /* HAVE_POSIX_ACL_CACHING */
+}
+
+static inline void
+zpl_forget_cached_acl(struct inode *ip, int type) {
+ zpl_set_cached_acl(ip, type, (struct posix_acl *)ACL_NOT_CACHED);
+}
+#endif /* HAVE_POSIX_ACL_RELEASE */
+
+#ifndef HAVE___POSIX_ACL_CHMOD
+#ifdef HAVE_POSIX_ACL_CHMOD
+#define __posix_acl_chmod(acl, gfp, mode) posix_acl_chmod(acl, gfp, mode)
+#define __posix_acl_create(acl, gfp, mode) posix_acl_create(acl, gfp, mode)
+#else
+static inline int
+__posix_acl_chmod(struct posix_acl **acl, int flags, umode_t umode) {
+ struct posix_acl *oldacl = *acl;
+ mode_t mode = umode;
+ int error;
+
+ *acl = posix_acl_clone(*acl, flags);
+ zpl_posix_acl_release(oldacl);
+
+ if (!(*acl))
+ return (-ENOMEM);
+
+ error = posix_acl_chmod_masq(*acl, mode);
+ if (error) {
+ zpl_posix_acl_release(*acl);
+ *acl = NULL;
+ }
+
+ return (error);
+}
+
+static inline int
+__posix_acl_create(struct posix_acl **acl, int flags, umode_t *umodep) {
+ struct posix_acl *oldacl = *acl;
+ mode_t mode = *umodep;
+ int error;
+
+ *acl = posix_acl_clone(*acl, flags);
+ zpl_posix_acl_release(oldacl);
+
+ if (!(*acl))
+ return (-ENOMEM);
+
+ error = posix_acl_create_masq(*acl, &mode);
+ *umodep = mode;
+
+ if (error < 0) {
+ zpl_posix_acl_release(*acl);
+ *acl = NULL;
+ }
+
+ return (error);
+}
+#endif /* HAVE_POSIX_ACL_CHMOD */
+#endif /* HAVE___POSIX_ACL_CHMOD */
+
+#ifdef HAVE_POSIX_ACL_EQUIV_MODE_UMODE_T
+typedef umode_t zpl_equivmode_t;
+#else
+typedef mode_t zpl_equivmode_t;
+#endif /* HAVE_POSIX_ACL_EQUIV_MODE_UMODE_T */
+#endif /* CONFIG_FS_POSIX_ACL */
+
+#ifndef HAVE_CURRENT_UMASK
+static inline int
+current_umask(void)
+{
+ return (current->fs->umask);
+}
+#endif /* HAVE_CURRENT_UMASK */
+
+/*
+ * 2.6.38 API change,
+ * The is_owner_or_cap() function was renamed to inode_owner_or_capable().
+ */
+#ifdef HAVE_INODE_OWNER_OR_CAPABLE
+#define zpl_inode_owner_or_capable(ip) inode_owner_or_capable(ip)
+#else
+#define zpl_inode_owner_or_capable(ip) is_owner_or_cap(ip)
+#endif /* HAVE_INODE_OWNER_OR_CAPABLE */
+
+/*
+ * 3.19 API change
+ * struct access f->f_dentry->d_inode was replaced by accessor function
+ * file_inode(f)
+ */
+#ifndef HAVE_FILE_INODE
+static inline struct inode *file_inode(const struct file *f)
+{
+ return (f->f_dentry->d_inode);
+}
+#endif /* HAVE_FILE_INODE */
+
#endif /* _ZFS_VFS_H */
projects / mirror_zfs-debian.git / blobdiff