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69de6d7a74
We consistently enter scoutfs_data_wait_check when len == 0 from scoutfs_aio_write() which directly passes the i_size_read() value, and for cases where we `echo >> $FILE` this is always reached. This can cause the wrapping check to fail since `0 + (0 - 1) < 0` which triggers the WARN_ON_ONCE wrap check that needs updating to allow certain operations on huge files. More importantly we can just omit all these checks if `len == 0` anyway, since they should always succeed and never should require taking all the locks. Signed-off-by: Auke Kok <auke.kok@versity.com>
Introduction
scoutfs is a clustered in-kernel Linux filesystem designed to support large archival systems. It features additional interfaces and metadata so that archive agents can perform their maintenance workflows without walking all the files in the namespace. Its cluster support lets deployments add nodes to satisfy archival tier bandwidth targets.
The design goal is to reach file populations in the trillions, with the archival bandwidth to match, while remaining operational and responsive.
Highlights of the design and implementation include:
- Fully consistent POSIX semantics between nodes
- Atomic transactions to maintain consistent persistent structures
- Integrated archival metadata replaces syncing to external databases
- Dynamic seperation of resources lets nodes write in parallel
- 64bit throughout; no limits on file or directory sizes or counts
- Open GPLv2 implementation
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