btrfs: switch to ->write_iter()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index 39014d5..17e7393 100644 (file)
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -447,7 +447,7 @@ static noinline int btrfs_copy_from_user(loff_t pos, int num_pages,
                write_bytes -= copied;
                total_copied += copied;
 
-               /* Return to btrfs_file_aio_write to fault page */
+               /* Return to btrfs_file_write_iter to fault page */
                if (unlikely(copied == 0))
                        break;
 
@@ -1708,9 +1708,8 @@ static void update_time_for_write(struct inode *inode)
                inode_inc_iversion(inode);
 }
 
-static ssize_t btrfs_file_aio_write(struct kiocb *iocb,
-                                   const struct iovec *iov,
-                                   unsigned long nr_segs, loff_t pos)
+static ssize_t btrfs_file_write_iter(struct kiocb *iocb,
+                                   struct iov_iter *from)
 {
        struct file *file = iocb->ki_filp;
        struct inode *inode = file_inode(file);
@@ -1719,15 +1718,12 @@ static ssize_t btrfs_file_aio_write(struct kiocb *iocb,
        u64 end_pos;
        ssize_t num_written = 0;
        ssize_t err = 0;
-       size_t count;
+       size_t count = iov_iter_count(from);
        bool sync = (file->f_flags & O_DSYNC) || IS_SYNC(file->f_mapping->host);
-       struct iov_iter i;
+       loff_t pos = iocb->ki_pos;
 
        mutex_lock(&inode->i_mutex);
 
-       count = iov_length(iov, nr_segs);
-       iov_iter_init(&i, WRITE, iov, nr_segs, count);
-
        current->backing_dev_info = inode->i_mapping->backing_dev_info;
        err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode));
        if (err) {
@@ -1740,7 +1736,7 @@ static ssize_t btrfs_file_aio_write(struct kiocb *iocb,
                goto out;
        }
 
-       iov_iter_truncate(&i, count);
+       iov_iter_truncate(from, count);
 
        err = file_remove_suid(file);
        if (err) {
@@ -1783,9 +1779,9 @@ static ssize_t btrfs_file_aio_write(struct kiocb *iocb,
                atomic_inc(&BTRFS_I(inode)->sync_writers);
 
        if (unlikely(file->f_flags & O_DIRECT)) {
-               num_written = __btrfs_direct_write(iocb, &i, pos);
+               num_written = __btrfs_direct_write(iocb, from, pos);
        } else {
-               num_written = __btrfs_buffered_write(file, &i, pos);
+               num_written = __btrfs_buffered_write(file, from, pos);
                if (num_written > 0)
                        iocb->ki_pos = pos + num_written;
        }
@@ -2623,10 +2619,10 @@ out:
 const struct file_operations btrfs_file_operations = {
        .llseek         = btrfs_file_llseek,
        .read           = new_sync_read,
-       .write          = do_sync_write,
+       .write          = new_sync_write,
        .read_iter      = generic_file_read_iter,
        .splice_read    = generic_file_splice_read,
-       .aio_write      = btrfs_file_aio_write,
+       .write_iter     = btrfs_file_write_iter,
        .mmap           = btrfs_file_mmap,
        .open           = generic_file_open,
        .release        = btrfs_release_file,