ext4: implement exists() for ext4fs
This hooks into the generic "file exists" support added in an earlier
patch, and provides an implementation for the ext4 filesystem.
Signed-off-by: Stephen Warren <swarren@nvidia.com>
Acked-by: Simon Glass <sjg@chromium.org>
diff --git a/fs/ext4/ext4fs.c b/fs/ext4/ext4fs.c
index 735b256..417ce7b 100644
--- a/fs/ext4/ext4fs.c
+++ b/fs/ext4/ext4fs.c
@@ -174,6 +174,14 @@
return 0;
}
+int ext4fs_exists(const char *filename)
+{
+ int file_len;
+
+ file_len = ext4fs_open(filename);
+ return file_len >= 0;
+}
+
int ext4fs_read(char *buf, unsigned len)
{
if (ext4fs_root == NULL || ext4fs_file == NULL)
diff --git a/fs/fs.c b/fs/fs.c
index 2e60f57..4e9b162 100644
--- a/fs/fs.c
+++ b/fs/fs.c
@@ -102,7 +102,7 @@
.probe = ext4fs_probe,
.close = ext4fs_close,
.ls = ext4fs_ls,
- .exists = fs_exists_unsupported,
+ .exists = ext4fs_exists,
.read = ext4_read_file,
.write = fs_write_unsupported,
},
diff --git a/include/ext4fs.h b/include/ext4fs.h
index 2429380..aacb147 100644
--- a/include/ext4fs.h
+++ b/include/ext4fs.h
@@ -134,6 +134,7 @@
int ext4fs_mount(unsigned part_length);
void ext4fs_close(void);
int ext4fs_ls(const char *dirname);
+int ext4fs_exists(const char *filename);
void ext4fs_free_node(struct ext2fs_node *node, struct ext2fs_node *currroot);
int ext4fs_devread(lbaint_t sector, int byte_offset, int byte_len, char *buf);
void ext4fs_set_blk_dev(block_dev_desc_t *rbdd, disk_partition_t *info);