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authorJan Kara <jack@suse.cz>2011-12-10 02:30:48 +0100
committerJan Kara <jack@suse.cz>2012-01-09 13:52:08 +0100
commitd2eb8c359309ec45d6bf5b147303ab8e13be86ea (patch)
tree4725da2f9f5728b41960cff7b628d0997812504c /block
parent7b0b0933a3ff6052addf4d49ea99f75ab27df2d0 (diff)
udf: Fix deadlock when converting file from in-ICB one to normal one
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(). CC: stable@kernel.org 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>
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