ext4: fix incorrect locking in move_extent_per_page
If we have to copy data we must drop i_data_sem because of get_blocks() will be called inside mext_page_mkuptodate(), but later we must reacquire it again because we are about to change extent's tree Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org> Signed-off-by: Theodore Ts'o <tytso@mit.edu> Reviewed-by: Jan Kara <jack@suse.cz>
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@ -1013,10 +1013,11 @@ data_copy:
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*err = -EBUSY;
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goto unlock_pages;
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}
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ext4_double_down_write_data_sem(orig_inode, donor_inode);
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replaced_count = mext_replace_branches(handle, orig_inode, donor_inode,
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orig_blk_offset,
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block_len_in_page, err);
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ext4_double_up_write_data_sem(orig_inode, donor_inode);
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if (*err) {
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if (replaced_count) {
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block_len_in_page = replaced_count;
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