path: root/fs/udf/file.c
diff options
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 /fs/udf/file.c
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>
Diffstat (limited to 'fs/udf/file.c')
1 files changed, 3 insertions, 3 deletions
diff --git a/fs/udf/file.c b/fs/udf/file.c
index d8ffa7cc661d..dca0c3881e82 100644
--- a/fs/udf/file.c
+++ b/fs/udf/file.c
@@ -125,7 +125,6 @@ static ssize_t udf_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
err = udf_expand_file_adinicb(inode);
if (err) {
udf_debug("udf_expand_adinicb: err=%d\n", err);
- up_write(&iinfo->i_data_sem);
return err;
} else {
@@ -133,9 +132,10 @@ static ssize_t udf_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
iinfo->i_lenAlloc = pos + count;
iinfo->i_lenAlloc = inode->i_size;
+ up_write(&iinfo->i_data_sem);
- }
- up_write(&iinfo->i_data_sem);
+ } else
+ up_write(&iinfo->i_data_sem);
retval = generic_file_aio_write(iocb, iov, nr_segs, ppos);
if (retval > 0)