btrfs: explictly delete unused block groups in close_ctree and ro-remount

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The cleaner thread may already be sleeping by the time we enter
close_ctree.  If that's the case, we'll skip removing any unused
block groups queued for removal, even during a normal umount.
They'll be cleaned up automatically at next mount, but users
expect a umount to be a clean synchronization point, especially
when used on thin-provisioned storage with -odiscard.  We also
explicitly remove unused block groups in the ro-remount path
for the same reason.

Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Reviewed-by: Filipe Manana <fdmanana@suse.com>
Tested-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: Chris Mason <clm@fb.com>

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Jeff Mahoney 2015-06-15 09:41:18 -04:00 • committed by Chris Mason

parent 499f377f49

commit e44163e177

2 changed files with 20 additions and 0 deletions

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9

fs/btrfs/disk-io.c

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11

fs/btrfs/super.c

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