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reiserfs: don't preallocate blocks for extended attributes
Most extended attributes will fit in a single block. More importantly, we drop the reference to the inode while holding the transaction open so the preallocated blocks aren't released. As a result, the inode may be evicted before it's removed from the transaction's prealloc list which can cause memory corruption. Signed-off-by: Jeff Mahoney <jeffm@suse.com> Signed-off-by: Jan Kara <jack@suse.cz>
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