Jan Kara 608620c3e7
udf: Fix deadlock when converting file from in-ICB one to normal one ...
commit d2eb8c359309ec45d6bf5b147303ab8e13be86ea upstream.
During BKL removal in 2.6.38, conversion of files from in-ICB format to normal
format got broken. We call ->writepage with i_data_sem held but udf_get_block()
also acquires i_data_sem thus creating A-A deadlock.
We fix the problem by dropping i_data_sem before calling ->writepage() which is
safe since i_mutex still protects us against any changes in the file. Also fix
pagelock - i_data_sem lock inversion in udf_expand_file_adinicb() by dropping
i_data_sem before calling find_or_create_page().
Reported-by: Matthias Matiak <netzpython@mail-on.us >
Tested-by: Matthias Matiak <netzpython@mail-on.us >
Reviewed-by: Namjae Jeon <linkinjeon@gmail.com >
Signed-off-by: Jan Kara <jack@suse.cz >
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de >
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608620c3e7