LU-10805 ldlm: convert ACCESS_ONCE() to READ_ONCE()

[fs/lustre-release.git] / lustre / include / lustre_compat.h

diff --git a/lustre/include/lustre_compat.h b/lustre/include/lustre_compat.h
index 5a4a591..158bbb3 100644 (file)
--- a/lustre/include/lustre_compat.h
+++ b/lustre/include/lustre_compat.h
@@ -33,13 +33,16 @@
 #ifndef _LUSTRE_COMPAT_H
 #define _LUSTRE_COMPAT_H
 
+#include <linux/aio.h>
+#include <linux/fs.h>
 #include <linux/fs_struct.h>
 #include <linux/namei.h>
 #include <linux/pagemap.h>
 #include <linux/bio.h>
 #include <linux/xattr.h>
+#include <linux/workqueue.h>
 
-#include <libcfs/libcfs.h>
+#include <libcfs/linux/linux-fs.h>
 #include <lustre_patchless_compat.h>
 #include <obd_support.h>
 
@@ -51,22 +54,31 @@
 # define UNLOCK_FS_STRUCT(fs)  spin_unlock(&(fs)->lock)
 #endif
 
+#ifdef HAVE_FS_STRUCT_SEQCOUNT
+# define WRITE_FS_SEQ_BEGIN(fs)        write_seqcount_begin(&(fs)->seq)
+# define WRITE_FS_SEQ_END(fs)  write_seqcount_end(&(fs)->seq)
+#else
+# define WRITE_FS_SEQ_BEGIN(fs)
+# define WRITE_FS_SEQ_END(fs)
+#endif
 static inline void ll_set_fs_pwd(struct fs_struct *fs, struct vfsmount *mnt,
                                  struct dentry *dentry)
 {
-        struct path path;
-        struct path old_pwd;
-
-        path.mnt = mnt;
-        path.dentry = dentry;
-        LOCK_FS_STRUCT(fs);
-        old_pwd = fs->pwd;
-        path_get(&path);
-        fs->pwd = path;
-        UNLOCK_FS_STRUCT(fs);
-
-        if (old_pwd.dentry)
-                path_put(&old_pwd);
+       struct path path;
+       struct path old_pwd;
+
+       path.mnt = mnt;
+       path.dentry = dentry;
+       path_get(&path);
+       LOCK_FS_STRUCT(fs);
+       WRITE_FS_SEQ_BEGIN(fs);
+       old_pwd = fs->pwd;
+       fs->pwd = path;
+       WRITE_FS_SEQ_END(fs);
+       UNLOCK_FS_STRUCT(fs);
+
+       if (old_pwd.dentry)
+               path_put(&old_pwd);
 }
 
 /*
@@ -381,6 +393,16 @@ static inline void truncate_inode_pages_final(struct address_space *map)
 }
 #endif
 
+#ifndef HAVE_PTR_ERR_OR_ZERO
+static inline int __must_check PTR_ERR_OR_ZERO(__force const void *ptr)
+{
+       if (IS_ERR(ptr))
+               return PTR_ERR(ptr);
+       else
+               return 0;
+}
+#endif
+
 #ifndef SIZE_MAX
 #define SIZE_MAX       (~(size_t)0)
 #endif
@@ -447,37 +469,30 @@ int ll_removexattr(struct dentry *dentry, const char *name);
 #ifndef HAVE_VFS_SETXATTR
 const struct xattr_handler *get_xattr_type(const char *name);
 
-#ifdef HAVE_XATTR_HANDLER_FLAGS
 static inline int
 __vfs_setxattr(struct dentry *dentry, struct inode *inode, const char *name,
               const void *value, size_t size, int flags)
 {
+# ifdef HAVE_XATTR_HANDLER_FLAGS
        const struct xattr_handler *handler;
        int rc;
 
        handler = get_xattr_type(name);
        if (!handler)
-               return -ENXIO;
-
-#if defined(HAVE_XATTR_HANDLER_INODE_PARAM)
-       rc = handler->set(handler, dentry, inode, name, value, size,
-                         XATTR_CREATE);
-#elif defined(HAVE_XATTR_HANDLER_SIMPLIFIED)
-       rc = handler->set(handler, dentry, name, value, size, XATTR_CREATE);
-#else
-       rc = handler->set(dentry, name, value, size, XATTR_CREATE,
-                         handler->flags);
-#endif /* !HAVE_XATTR_HANDLER_INODE_PARAM */
+               return -EOPNOTSUPP;
+
+#  if defined(HAVE_XATTR_HANDLER_INODE_PARAM)
+       rc = handler->set(handler, dentry, inode, name, value, size, flags);
+#  elif defined(HAVE_XATTR_HANDLER_SIMPLIFIED)
+       rc = handler->set(handler, dentry, name, value, size, flags);
+#  else
+       rc = handler->set(dentry, name, value, size, flags, handler->flags);
+#  endif /* !HAVE_XATTR_HANDLER_INODE_PARAM */
        return rc;
-}
-#else /* !HAVE_XATTR_HANDLER_FLAGS */
-static inline int
-__vfs_setxattr(struct dentry *dentry, struct inode *inode, const char *name,
-              const void *value, size_t size, int flags)
-{
+# else /* !HAVE_XATTR_HANDLER_FLAGS */
        return ll_setxattr(dentry, name, value, size, flags);
+# endif /* HAVE_XATTR_HANDLER_FLAGS */
 }
-#endif /* HAVE_XATTR_HANDLER_FLAGS */
 #endif /* HAVE_VFS_SETXATTR */
 
 #ifdef HAVE_IOP_SET_ACL
@@ -667,6 +682,19 @@ static inline struct timespec current_time(struct inode *inode)
  */
 #define time_after32(a, b)     ((s32)((u32)(b) - (u32)(a)) < 0)
 #define time_before32(b, a)    time_after32(a, b)
+
+#endif
+
+#ifndef __GFP_COLD
+#define __GFP_COLD 0
+#endif
+
+#ifndef alloc_workqueue
+#define alloc_workqueue(name, flags, max_active) create_workqueue(name)
+#endif
+
+#ifndef READ_ONCE
+#define READ_ONCE ACCESS_ONCE
 #endif
 
 #endif /* _LUSTRE_COMPAT_H */