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Diffstat (limited to 'Documentation/filesystems')
| -rw-r--r-- | Documentation/filesystems/f2fs.rst | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/Documentation/filesystems/f2fs.rst b/Documentation/filesystems/f2fs.rst index ec8d99703ecb..0f37c7443d5c 100644 --- a/Documentation/filesystems/f2fs.rst +++ b/Documentation/filesystems/f2fs.rst @@ -772,3 +772,18 @@ Compress metadata layout:: +-------------+-------------+----------+----------------------------+ | data length | data chksum | reserved | compressed data | +-------------+-------------+----------+----------------------------+ + +NVMe Zoned Namespace devices +---------------------------- + +- ZNS defines a per-zone capacity which can be equal or less than the + zone-size. Zone-capacity is the number of usable blocks in the zone. + F2fs checks if zone-capacity is less than zone-size, if it is, then any + segment which starts after the zone-capacity is marked as not-free in + the free segment bitmap at initial mount time. These segments are marked + as permanently used so they are not allocated for writes and + consequently are not needed to be garbage collected. In case the + zone-capacity is not aligned to default segment size(2MB), then a segment + can start before the zone-capacity and span across zone-capacity boundary. + Such spanning segments are also considered as usable segments. All blocks + past the zone-capacity are considered unusable in these segments. |