fs: have setattr_copy handle multigrain timestamps appropriately

The setattr codepath is still using coarse-grained timestamps, even on
multigrain filesystems. To fix this, fetch the timestamp for ctime
updates later, at the point where the assignment occurs in setattr_copy.

On a multigrain inode, ignore the ia_ctime in the attrs, and always
update the ctime to the current clock value. Update the atime and mtime
with the same value (if needed) unless they are being set to other
specific values, a'la utimes().

Do not do this universally however, as some filesystems (e.g. most
networked fs) want to do an explicit update elsewhere before updating
the local inode.

Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Tested-by: Randy Dunlap <rdunlap@infradead.org> # documentation bits
Signed-off-by: Jeff Layton <jlayton@kernel.org>
Link: https://lore.kernel.org/r/20241002-mgtime-v10-4-d1c4717f5284@kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>

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