btrfs: introduce try-lock semantics for exclusive op start

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Add try-lock for exclusive operation start to allow callers to do more
checks. The same operation must already be running. The try-lock and
unlock must pair and are a substitute for btrfs_exclop_start, thus it
must also pair with btrfs_exclop_finish to release the exclop context.

Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>

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David Sterba 2021-05-18 21:05:52 +02:00

parent 907d2710d7

commit 578bda9e17

2 changed files with 29 additions and 0 deletions

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3

fs/btrfs/ctree.h

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26

fs/btrfs/ioctl.c

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