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btrfs-progs: docs: document fs exclusive operations

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Signed-off-by: David Sterba <dsterba@suse.com>
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David Sterba 2020-12-10 17:06:36 +01:00
parent e198c6674a
commit ffd1601236
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Documentation/btrfs-man5.asciidoc
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@ -13,6 +13,7 @@ tools. Currently covers:
. mount options
. filesystem features
. checksum algorithms
. filesystem exclusive operations
. filesystem limits
. bootloader support
. file attributes
@ -737,6 +738,27 @@ h| Digest h| Cycles/4KiB h| Ratio
|================================
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.
Since kernel 5.10 the currently running operation can be obtained from
`/sys/fs/UUID/exclusive_operation` with following values and operations:
- balance
- device add
- device delete
- device replace
- resize
- swapfile activate
- none
Enqueuing is supported for several btrfs subcommands so they can be started
at once and then serialized.
FILESYSTEM LIMITS
-----------------