Add a helper dealing with handling the syncing of a buffered write fallback
for direct I/O.
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
---
fs/libfs.c | 36 ++++++++++++++++++++++++++++
include/linux/fs.h | 2 ++
mm/filemap.c | 59 ++++++++++------------------------------------
3 files changed, 50 insertions(+), 47 deletions(-)
diff --git a/fs/libfs.c b/fs/libfs.c
index 4eda519c30022f..a530d36e0d1a3d 100644
--- a/fs/libfs.c
+++ b/fs/libfs.c
@@ -1618,3 +1618,39 @@ u64 inode_query_iversion(struct inode *inode)
return cur >> I_VERSION_QUERIED_SHIFT;
}
EXPORT_SYMBOL(inode_query_iversion);
+
+ssize_t direct_write_fallback(struct kiocb *iocb, struct iov_iter *iter,
+ ssize_t direct_written, ssize_t buffered_written)
+{
+ struct address_space *mapping = iocb->ki_filp->f_mapping;
+ loff_t pos = iocb->ki_pos, end;
+ int err;
+
+ /*
+ * If the buffered write fallback returned an error, we want to return
+ * the number of bytes which were written by direct I/O, or the error
+ * code if that was zero.
+ *
+ * Note that this differs from normal direct-io semantics, which will
+ * return -EFOO even if some bytes were written.
+ */
+ if (unlikely(buffered_written < 0))
+ return buffered_written;
+
+ /*
+ * We need to ensure that the page cache pages are written to disk and
+ * invalidated to preserve the expected O_DIRECT semantics.
+ */
+ end = pos + buffered_written - 1;
+ err = filemap_write_and_wait_range(mapping, pos, end);
+ if (err < 0) {
+ /*
+ * We don't know how much we wrote, so just return the number of
+ * bytes which were direct-written
+ */
+ return err;
+ }
+ invalidate_mapping_pages(mapping, pos >> PAGE_SHIFT, end >> PAGE_SHIFT);
+ return direct_written + buffered_written;
+}
+EXPORT_SYMBOL_GPL(direct_write_fallback);
diff --git a/include/linux/fs.h b/include/linux/fs.h
index b8ca376e606255..337afdb5024dcb 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -2719,6 +2719,8 @@ extern ssize_t __generic_file_write_iter(struct kiocb *, struct iov_iter *);
extern ssize_t generic_file_write_iter(struct kiocb *, struct iov_iter *);
extern ssize_t generic_file_direct_write(struct kiocb *, struct iov_iter *);
ssize_t generic_perform_write(struct kiocb *, struct iov_iter *);
+ssize_t direct_write_fallback(struct kiocb *iocb, struct iov_iter *iter,
+ ssize_t direct_written, ssize_t buffered_written);
ssize_t vfs_iter_read(struct file *file, struct iov_iter *iter, loff_t *ppos,
rwf_t flags);
diff --git a/mm/filemap.c b/mm/filemap.c
index 8c5196cf93a454..bb769746f78b08 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -4009,25 +4009,21 @@ 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;
- struct inode *inode = mapping->host;
- ssize_t written = 0;
- ssize_t err;
- ssize_t status;
+ struct inode *inode = mapping->host;
+ ssize_t ret;
/* We can write back this queue in page reclaim */
current->backing_dev_info = inode_to_bdi(inode);
- err = file_remove_privs(file);
- if (err)
+ ret = file_remove_privs(file);
+ if (ret)
goto out;
- err = file_update_time(file);
- if (err)
+ ret = file_update_time(file);
+ if (ret)
goto out;
if (iocb->ki_flags & IOCB_DIRECT) {
- loff_t pos, endbyte;
-
- written = generic_file_direct_write(iocb, from);
+ ret = generic_file_direct_write(iocb, from);
/*
* If the write stopped short of completing, fall back to
* buffered writes. Some filesystems do this for writes to
@@ -4035,46 +4031,15 @@ ssize_t __generic_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
* not succeed (even if it did, DAX does not handle dirty
* page-cache pages correctly).
*/
- if (written < 0 || !iov_iter_count(from) || IS_DAX(inode))
- goto out;
-
- pos = iocb->ki_pos;
- status = generic_perform_write(iocb, from);
- /*
- * If generic_perform_write() returned a synchronous error
- * then we want to return the number of bytes which were
- * direct-written, or the error code if that was zero. Note
- * that this differs from normal direct-io semantics, which
- * will return -EFOO even if some bytes were written.
- */
- if (unlikely(status < 0)) {
- err = status;
- goto out;
- }
- /*
- * We need to ensure that the page cache pages are written to
- * disk and invalidated to preserve the expected O_DIRECT
- * semantics.
- */
- endbyte = pos + status - 1;
- err = filemap_write_and_wait_range(mapping, pos, endbyte);
- if (err == 0) {
- written += status;
- invalidate_mapping_pages(mapping,
- pos >> PAGE_SHIFT,
- endbyte >> PAGE_SHIFT);
- } else {
- /*
- * We don't know how much we wrote, so just return
- * the number of bytes which were direct-written
- */
- }
+ if (ret >= 0 && iov_iter_count(from) && !IS_DAX(inode))
+ ret = direct_write_fallback(iocb, from, ret,
+ generic_perform_write(iocb, from));
} else {
- written = generic_perform_write(iocb, from);
+ ret = generic_perform_write(iocb, from);
}
out:
current->backing_dev_info = NULL;
- return written ? written : err;
+ return ret;
}
EXPORT_SYMBOL(__generic_file_write_iter);
--
2.39.2
