When an inode only has a single chunk then we can support memmap for
it.
Signed-off-by: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
---
fs/ramfs.c | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
diff --git a/fs/ramfs.c b/fs/ramfs.c
index ebe03de736..84aa56f83e 100644
--- a/fs/ramfs.c
+++ b/fs/ramfs.c
@@ -387,6 +387,25 @@ static int ramfs_truncate(struct device_d *dev, FILE *f, loff_t size)
return 0;
}
+static int ramfs_memmap(struct device_d *_dev, FILE *f, void **map, int flags)
+{
+ struct inode *inode = f->f_inode;
+ struct ramfs_inode *node = to_ramfs_inode(inode);
+ struct ramfs_chunk *data;
+
+ if (list_empty(&node->data))
+ return -EINVAL;
+
+ if (!list_is_singular(&node->data))
+ return -EINVAL;
+
+ data = list_first_entry(&node->data, struct ramfs_chunk, list);
+
+ *map = data->data;
+
+ return 0;
+}
+
static struct inode *ramfs_alloc_inode(struct super_block *sb)
{
struct ramfs_inode *node;
@@ -434,6 +453,7 @@ static void ramfs_remove(struct device_d *dev)
static struct fs_driver_d ramfs_driver = {
.read = ramfs_read,
.write = ramfs_write,
+ .memmap = ramfs_memmap,
.truncate = ramfs_truncate,
.flags = FS_DRIVER_NO_DEV,
.drv = {
--
2.27.0
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