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xfs: improve the comments in xfs_max_open_zones

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Describe the rationale for the decisions a bit better.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Carlos Maiolino <cem@kernel.org>
This commit is contained in:
Christoph Hellwig
2025-07-16 14:54:06 +02:00
committed by Carlos Maiolino
parent 86e6ddf1d0
commit 7cbbfd27a9
1 changed files with 9 additions and 6 deletions
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15
fs/xfs/xfs_zone_alloc.c
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@@ -1114,24 +1114,27 @@ xfs_get_zone_info_cb(
}
/*
* Calculate the max open zone limit based on the of number of
* backing zones available
* Calculate the max open zone limit based on the of number of backing zones
* available.
*/
static inline uint32_t
xfs_max_open_zones(
struct xfs_mount *mp)
{
unsigned int max_open, max_open_data_zones;
/*
* We need two zones for every open data zone,
* one in reserve as we don't reclaim open zones. One data zone
* and its spare is included in XFS_MIN_ZONES.
* We need two zones for every open data zone, one in reserve as we
* don't reclaim open zones. One data zone and its spare is included
* in XFS_MIN_ZONES to support at least one user data writer.
*/
max_open_data_zones = (mp->m_sb.sb_rgcount - XFS_MIN_ZONES) / 2 + 1;
max_open = max_open_data_zones + XFS_OPEN_GC_ZONES;
/*
* Cap the max open limit to 1/4 of available space
* Cap the max open limit to 1/4 of available space. Without this we'd
* run out of easy reclaim targets too quickly and storage devices don't
* handle huge numbers of concurrent write streams overly well.
*/
max_open = min(max_open, mp->m_sb.sb_rgcount / 4);