vfs: wrap write f_ops with file_{start,end}_write()
Before calling write f_ops, call file_start_write() instead of sb_start_write(). Replace {sb,file}_start_write() for {copy,clone}_file_range() and for fallocate(). Beyond correct semantics, this avoids freeze protection to sb when operating on special inodes, such as fallocate() on a blockdev. Reviewed-by: NJan Kara <jack@suse.cz> Signed-off-by: NAmir Goldstein <amir73il@gmail.com> Reviewed-by: NChristoph Hellwig <hch@lst.de> Signed-off-by: NMiklos Szeredi <mszeredi@redhat.com>
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