When I want to remove a directory using "rm -rf <dir>" command, a error message
"The directory is not empty" occurs and serveral files in the directory are not deleted.
I traced into the code and found that yaffs_readdir() could be called serveral times by
one time execution of "rm".Also, the file->f_pos are increased if a child(file) of this
directory was found.
"rm" unlink the file read from directory entry:
rm->unlink()-> yaffs_unlink()-> yaffs_Unlink() ->yaffs_UnlinkWorker() ->
yaffs_UnlinkFile()->yaffs_ChangeObjectName()->yaffs_AddObjectToDirectory(), the unlinked
file will be add to "unlinked directory", in this case, this file is removed from its old
parent directory's children list(obj->variant.directoryVariant.children) but added to the
children of unlinked dir. (Is it right???)
The question is when "rm" has to call readdir() again because of low buffer, file->f_pos
is not 0 but a large number, the following code in yaffs_readdir() will bypass serveral
files:
offset = f->f_pos;
....
curoffs = 1;
list_for_each(i,&obj->variant.directoryVariant.children)
{
curoffs++;
if(curoffs >= offset)
{
curoffs have to increase until it reaches f->f_pos, so readdir() miss serveral files in
the front of obj->variant.directoryVariant.children
As a result, serveral files in the directory are not able to be unlinked, consequently,
direcotry can not be removed.
I wonder if my traces are right, how could I fix my problem ? I delete a single file or
directory with a small number of files, it is all right.
My arm Kernel is 2.4.18 running on samsung S3C2410. Nand Flash is samsung 128Mb with 2k
Large page.
Thanks a Lot!!
--Zhen Feng
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