Xiang Xiao 1e5bfa623a fs: file_dup2 shouldn't hold the file list lock
the argument passed to file_dup2 doesn't always come from task file list
so it doesn't make sense to hold the file list lock and then it is better
to do the protection in the new function files_dupfd2

Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
Change-Id: Ibf02cea9b0b275e7472f9c04fd66b9242285b957
2021-01-13 16:39:45 +08:00
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