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btrfs-progs: docs: document paused balance

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Signed-off-by: David Sterba <dsterba@suse.com>
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David Sterba 2022-05-12 20:33:03 +02:00
parent 908a46085c
commit 1a431b0837
1 changed files with 6 additions and 1 deletions
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Documentation/btrfs-man5.rst
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@ -196,12 +196,14 @@ FILESYSTEM EXCLUSIVE OPERATIONS
-------------------------------
There are several operations that affect the whole filesystem and cannot be run
in parallel. Attempt to start one while another is running will fail.
in parallel. Attempt to start one while another is running will fail (see
exceptions below).
Since kernel 5.10 the currently running operation can be obtained from
*/sys/fs/UUID/exclusive_operation* with following values and operations:
* balance
* balance paused (since 5.17)
* device add
* device delete
* device replace
@ -212,6 +214,9 @@ Since kernel 5.10 the currently running operation can be obtained from
Enqueuing is supported for several btrfs subcommands so they can be started
at once and then serialized.
There's an exception when a paused balance allows to start a device add
operation as they don't really collide and this can be used to add more space
for the balance to finish.
FILESYSTEM LIMITS
-----------------