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Merge branch 'md-next' of https://git./linux/kernel/git/song/md into for-5.13/drivers
Pull MD updates from Song:
"The major changes are:
1. Performance improvement for raid10 discard requests, from Xiao Ni.
2. Fix missing information of /proc/mdstat, from Jan Glauber."
* 'md-next' of https://git.kernel.org/pub/scm/linux/kernel/git/song/md:
md: Fix missing unused status line of /proc/mdstat
md/raid10: improve discard request for far layout
md/raid10: improve raid10 discard request
md/raid10: pull the code that wait for blocked dev into one function
md/raid10: extend r10bio devs to raid disks
md: add md_submit_discard_bio() for submitting discard bio