btrfs: zoned: fix API misuse of zone finish waiting

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commit d5b81ced74 upstream.

The commit 2ce543f478 ("btrfs: zoned: wait until zone is finished when
allocation didn't progress") implemented a zone finish waiting mechanism
to the write path of zoned mode. However, using
wait_var_event()/wake_up_all() on fs_info->zone_finish_wait is wrong and
wait_var_event() just hangs because no one ever wakes it up once it goes
into sleep.

Instead, we can simply use wait_on_bit_io() and clear_and_wake_up_bit()
on fs_info->flags with a proper barrier installed.

Fixes: 2ce543f478 ("btrfs: zoned: wait until zone is finished when allocation didn't progress")
CC: stable@vger.kernel.org # 5.16+
Signed-off-by: Naohiro Aota <naohiro.aota@wdc.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

This commit is contained in:

Naohiro Aota 2022-08-31 13:55:48 +09:00 • committed by Greg Kroah-Hartman

parent 9a196afce1

commit fddebf9a35

4 changed files with 4 additions and 9 deletions

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2

fs/btrfs/ctree.h

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1

fs/btrfs/disk-io.c

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7

fs/btrfs/inode.c

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3

fs/btrfs/zoned.c

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