vfs: add the sb_start_intwrite_trylock() helper
Needed by ext4 to test frozen fs before updating s_last_mounted. Signed-off-by: NAmir Goldstein <amir73il@gmail.com> Signed-off-by: NTheodore Ts'o <tytso@mit.edu> Reviewed-by: NJan Kara <jack@suse.cz>
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