write_iter variants of {__,}generic_file_aio_write()
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/mm/filemap.c b/mm/filemap.c
index c0404b7..d2d9eee 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -2542,10 +2542,9 @@
EXPORT_SYMBOL(generic_perform_write);
/**
- * __generic_file_aio_write - write data to a file
+ * __generic_file_write_iter - write data to a file
* @iocb: IO state structure (file, offset, etc.)
- * @iov: vector with data to write
- * @nr_segs: number of segments in the vector
+ * @from: iov_iter with data to write
*
* This function does all the work needed for actually writing data to a
* file. It does all basic checks, removes SUID from the file, updates
@@ -2559,21 +2558,16 @@
* A caller has to handle it. This is mainly due to the fact that we want to
* avoid syncing under i_mutex.
*/
-ssize_t __generic_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
- unsigned long nr_segs)
+ssize_t __generic_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
{
struct file *file = iocb->ki_filp;
struct address_space * mapping = file->f_mapping;
- size_t count; /* after file limit checks */
struct inode *inode = mapping->host;
loff_t pos = iocb->ki_pos;
ssize_t written = 0;
ssize_t err;
ssize_t status;
- struct iov_iter from;
-
- count = iov_length(iov, nr_segs);
- iov_iter_init(&from, WRITE, iov, nr_segs, count);
+ size_t count = iov_iter_count(from);
/* We can write back this queue in page reclaim */
current->backing_dev_info = mapping->backing_dev_info;
@@ -2584,7 +2578,7 @@
if (count == 0)
goto out;
- iov_iter_truncate(&from, count);
+ iov_iter_truncate(from, count);
err = file_remove_suid(file);
if (err)
@@ -2598,7 +2592,7 @@
if (unlikely(file->f_flags & O_DIRECT)) {
loff_t endbyte;
- written = generic_file_direct_write(iocb, &from, pos);
+ written = generic_file_direct_write(iocb, from, pos);
if (written < 0 || written == count)
goto out;
@@ -2609,7 +2603,7 @@
pos += written;
count -= written;
- status = generic_perform_write(file, &from, pos);
+ status = generic_perform_write(file, from, pos);
/*
* If generic_perform_write() returned a synchronous error
* then we want to return the number of bytes which were
@@ -2641,7 +2635,7 @@
*/
}
} else {
- written = generic_perform_write(file, &from, pos);
+ written = generic_perform_write(file, from, pos);
if (likely(written >= 0))
iocb->ki_pos = pos + written;
}
@@ -2649,30 +2643,36 @@
current->backing_dev_info = NULL;
return written ? written : err;
}
+EXPORT_SYMBOL(__generic_file_write_iter);
+
+ssize_t __generic_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
+ unsigned long nr_segs)
+{
+ size_t count = iov_length(iov, nr_segs);
+ struct iov_iter from;
+
+ iov_iter_init(&from, WRITE, iov, nr_segs, count);
+ return __generic_file_write_iter(iocb, &from);
+}
EXPORT_SYMBOL(__generic_file_aio_write);
/**
- * generic_file_aio_write - write data to a file
+ * generic_file_write_iter - write data to a file
* @iocb: IO state structure
- * @iov: vector with data to write
- * @nr_segs: number of segments in the vector
- * @pos: position in file where to write
+ * @from: iov_iter with data to write
*
- * This is a wrapper around __generic_file_aio_write() to be used by most
+ * This is a wrapper around __generic_file_write_iter() to be used by most
* filesystems. It takes care of syncing the file in case of O_SYNC file
* and acquires i_mutex as needed.
*/
-ssize_t generic_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
- unsigned long nr_segs, loff_t pos)
+ssize_t generic_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
{
struct file *file = iocb->ki_filp;
struct inode *inode = file->f_mapping->host;
ssize_t ret;
- BUG_ON(iocb->ki_pos != pos);
-
mutex_lock(&inode->i_mutex);
- ret = __generic_file_aio_write(iocb, iov, nr_segs);
+ ret = __generic_file_write_iter(iocb, from);
mutex_unlock(&inode->i_mutex);
if (ret > 0) {
@@ -2684,6 +2684,19 @@
}
return ret;
}
+EXPORT_SYMBOL(generic_file_write_iter);
+
+ssize_t generic_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
+ unsigned long nr_segs, loff_t pos)
+{
+ size_t count = iov_length(iov, nr_segs);
+ struct iov_iter from;
+
+ BUG_ON(iocb->ki_pos != pos);
+
+ iov_iter_init(&from, WRITE, iov, nr_segs, count);
+ return generic_file_write_iter(iocb, &from);
+}
EXPORT_SYMBOL(generic_file_aio_write);
/**