fs:ext4:write:fix: Reinitialize global variables after updating a file

This bug shows up when file stored on the ext4 file system is updated.

The ext4fs_delete_file() is responsible for deleting file's (e.g. uImage)
data.
However some global data (especially ext4fs_indir2_block), which is used
during file deletion are left unchanged.

The ext4fs_indir2_block pointer stores reference to old ext4 double
indirect allocated blocks. When it is unchanged, after file deletion,
ext4fs_write_file() uses the same pointer (since it is already initialized
- i.e. not NULL) to return number of blocks to write. This trunks larger
file when previous one was smaller.

Lets consider following scenario:

1. Flash target with ext4 formatted boot.img (which has uImage [*] on itself)
2. Developer wants to upload their custom uImage [**]
	- When new uImage [**] is smaller than the [*] - everything works
	correctly - we are able to store the whole smaller file with corrupted
	ext4fs_indir2_block pointer
	- When new uImage [**] is larger than the [*] - theCRC is corrupted,
	since truncation on data stored at eMMC was done.
3. When uImage CRC error appears, then reboot and LTHOR/DFU reflashing causes
	proper setting of ext4fs_indir2_block() and after that uImage[**]
	is successfully stored (correct uImage [*] metadata is stored at an
	eMMC on the first flashing).

Due to above the bug was very difficult to reproduce.
This patch sets default values for all ext4fs_indir* pointers/variables.

Signed-off-by: Lukasz Majewski <l.majewski@samsung.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/fs/ext4/ext4_write.c b/fs/ext4/ext4_write.c
index 3db22f8f93..c42add9a7e 100644
--- a/fs/ext4/ext4_write.c
+++ b/fs/ext4/ext4_write.c
@@ -562,6 +562,7 @@ static int ext4fs_delete_file(int inodeno)
 
 	ext4fs_update();
 	ext4fs_deinit();
+	ext4fs_reinit_global();
 
 	if (ext4fs_init() != 0) {
 		printf("error in File System init\n");