btrfs: fix several uncheck memory allocations
To make btrfs more stable, add several missing necessary memory allocation checks, and when no memory, return proper errno. We've checked that some of those -ENOMEM errors will be returned to userspace, and some will be catched by BUG_ON() in the upper callers, and none will be ignored silently. Signed-off-by: NLiu Bo <liubo2009@cn.fujitsu.com> Signed-off-by: NChris Mason <chris.mason@oracle.com>
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