nfsd4: don't check ip address in setclientid

[safe/jmp/linux-2.6] / fs / sync.c

diff --git a/fs/sync.c b/fs/sync.c
index 2f97576..a16d53e 100644 (file)
--- a/fs/sync.c
+++ b/fs/sync.c
@@ -36,7 +36,7 @@ static void do_sync(unsigned long wait)
                laptop_sync_completion();
 }
 
-asmlinkage long sys_sync(void)
+SYSCALL_DEFINE0(sync)
 {
        do_sync(1);
        return 0;
@@ -64,7 +64,7 @@ int file_fsync(struct file *filp, struct dentry *dentry, int datasync)
        /* sync the superblock to buffers */
        sb = inode->i_sb;
        lock_super(sb);
-       if (sb->s_op->write_super)
+       if (sb->s_dirt && sb->s_op->write_super)
                sb->s_op->write_super(sb);
        unlock_super(sb);
 
@@ -75,14 +75,39 @@ int file_fsync(struct file *filp, struct dentry *dentry, int datasync)
        return ret;
 }
 
-long do_fsync(struct file *file, int datasync)
+/**
+ * vfs_fsync - perform a fsync or fdatasync on a file
+ * @file:              file to sync
+ * @dentry:            dentry of @file
+ * @data:              only perform a fdatasync operation
+ *
+ * Write back data and metadata for @file to disk.  If @datasync is
+ * set only metadata needed to access modified file data is written.
+ *
+ * In case this function is called from nfsd @file may be %NULL and
+ * only @dentry is set.  This can only happen when the filesystem
+ * implements the export_operations API.
+ */
+int vfs_fsync(struct file *file, struct dentry *dentry, int datasync)
 {
-       int ret;
-       int err;
-       struct address_space *mapping = file->f_mapping;
+       const struct file_operations *fop;
+       struct address_space *mapping;
+       int err, ret;
+
+       /*
+        * Get mapping and operations from the file in case we have
+        * as file, or get the default values for them in case we
+        * don't have a struct file available.  Damn nfsd..
+        */
+       if (file) {
+               mapping = file->f_mapping;
+               fop = file->f_op;
+       } else {
+               mapping = dentry->d_inode->i_mapping;
+               fop = dentry->d_inode->i_fop;
+       }
 
-       if (!file->f_op || !file->f_op->fsync) {
-               /* Why?  We can still call filemap_fdatawrite */
+       if (!fop || !fop->fsync) {
                ret = -EINVAL;
                goto out;
        }
@@ -94,7 +119,7 @@ long do_fsync(struct file *file, int datasync)
         * livelocks in fsync_buffers_list().
         */
        mutex_lock(&mapping->host->i_mutex);
-       err = file->f_op->fsync(file, file->f_path.dentry, datasync);
+       err = fop->fsync(file, dentry, datasync);
        if (!ret)
                ret = err;
        mutex_unlock(&mapping->host->i_mutex);
@@ -104,28 +129,29 @@ long do_fsync(struct file *file, int datasync)
 out:
        return ret;
 }
+EXPORT_SYMBOL(vfs_fsync);
 
-static long __do_fsync(unsigned int fd, int datasync)
+static int do_fsync(unsigned int fd, int datasync)
 {
        struct file *file;
        int ret = -EBADF;
 
        file = fget(fd);
        if (file) {
-               ret = do_fsync(file, datasync);
+               ret = vfs_fsync(file, file->f_path.dentry, datasync);
                fput(file);
        }
        return ret;
 }
 
-asmlinkage long sys_fsync(unsigned int fd)
+SYSCALL_DEFINE1(fsync, unsigned int, fd)
 {
-       return __do_fsync(fd, 0);
+       return do_fsync(fd, 0);
 }
 
-asmlinkage long sys_fdatasync(unsigned int fd)
+SYSCALL_DEFINE1(fdatasync, unsigned int, fd)
 {
-       return __do_fsync(fd, 1);
+       return do_fsync(fd, 1);
 }
 
 /*
@@ -139,7 +165,8 @@ asmlinkage long sys_fdatasync(unsigned int fd)
  * before performing the write.
  *
  * SYNC_FILE_RANGE_WRITE: initiate writeout of all those dirty pages in the
- * range which are not presently under writeback.
+ * range which are not presently under writeback. Note that this may block for
+ * significant periods due to exhaustion of disk request structures.
  *
  * SYNC_FILE_RANGE_WAIT_AFTER: wait upon writeout of all pages in the range
  * after performing the write.
@@ -174,8 +201,8 @@ asmlinkage long sys_fdatasync(unsigned int fd)
  * already-instantiated disk blocks, there are no guarantees here that the data
  * will be available after a crash.
  */
-asmlinkage long sys_sync_file_range(int fd, loff_t offset, loff_t nbytes,
-                                       unsigned int flags)
+SYSCALL_DEFINE(sync_file_range)(int fd, loff_t offset, loff_t nbytes,
+                               unsigned int flags)
 {
        int ret;
        struct file *file;
@@ -235,6 +262,32 @@ out_put:
 out:
        return ret;
 }
+#ifdef CONFIG_HAVE_SYSCALL_WRAPPERS
+asmlinkage long SyS_sync_file_range(long fd, loff_t offset, loff_t nbytes,
+                                   long flags)
+{
+       return SYSC_sync_file_range((int) fd, offset, nbytes,
+                                   (unsigned int) flags);
+}
+SYSCALL_ALIAS(sys_sync_file_range, SyS_sync_file_range);
+#endif
+
+/* It would be nice if people remember that not all the world's an i386
+   when they introduce new system calls */
+SYSCALL_DEFINE(sync_file_range2)(int fd, unsigned int flags,
+                                loff_t offset, loff_t nbytes)
+{
+       return sys_sync_file_range(fd, offset, nbytes, flags);
+}
+#ifdef CONFIG_HAVE_SYSCALL_WRAPPERS
+asmlinkage long SyS_sync_file_range2(long fd, long flags,
+                                    loff_t offset, loff_t nbytes)
+{
+       return SYSC_sync_file_range2((int) fd, (unsigned int) flags,
+                                    offset, nbytes);
+}
+SYSCALL_ALIAS(sys_sync_file_range2, SyS_sync_file_range2);
+#endif
 
 /*
  * `endbyte' is inclusive
@@ -260,7 +313,7 @@ int do_sync_mapping_range(struct address_space *mapping, loff_t offset,
 
        if (flags & SYNC_FILE_RANGE_WRITE) {
                ret = __filemap_fdatawrite_range(mapping, offset, endbyte,
-                                               WB_SYNC_NONE);
+                                               WB_SYNC_ALL);
                if (ret < 0)
                        goto out;
        }