Quelle  xfs_zones.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (c) 2023-2025 Christoph Hellwig.
 * Copyright (c) 2024-2025, Western Digital Corporation or its affiliates.
 */
#include "xfs.h"
#include "xfs_fs.h"
#include "xfs_shared.h"
#include "xfs_format.h"
#include "xfs_log_format.h"
#include "xfs_trans_resv.h"
#include "xfs_mount.h"
#include "xfs_inode.h"
#include "xfs_rtgroup.h"
#include "xfs_zones.h"

static bool
xfs_zone_validate_empty(
 struct blk_zone  *zone,
 struct xfs_rtgroup *rtg,
 xfs_rgblock_t  *write_pointer)
{
 struct xfs_mount *mp = rtg_mount(rtg);

 if (rtg_rmap(rtg)->i_used_blocks > 0) {
  xfs_warn(mp, "empty zone %u has non-zero used counter (0x%x).",
    rtg_rgno(rtg), rtg_rmap(rtg)->i_used_blocks);
  return false;
 }

 *write_pointer = 0;
 return true;
}

static bool
xfs_zone_validate_wp(
 struct blk_zone  *zone,
 struct xfs_rtgroup *rtg,
 xfs_rgblock_t  *write_pointer)
{
 struct xfs_mount *mp = rtg_mount(rtg);
 xfs_rtblock_t  wp_fsb = xfs_daddr_to_rtb(mp, zone->wp);

 if (rtg_rmap(rtg)->i_used_blocks > rtg->rtg_extents) {
  xfs_warn(mp, "zone %u has too large used counter (0x%x).",
    rtg_rgno(rtg), rtg_rmap(rtg)->i_used_blocks);
  return false;
 }

 if (xfs_rtb_to_rgno(mp, wp_fsb) != rtg_rgno(rtg)) {
  xfs_warn(mp, "zone %u write pointer (0x%llx) outside of zone.",
    rtg_rgno(rtg), wp_fsb);
  return false;
 }

 *write_pointer = xfs_rtb_to_rgbno(mp, wp_fsb);
 if (*write_pointer >= rtg->rtg_extents) {
  xfs_warn(mp, "zone %u has invalid write pointer (0x%x).",
    rtg_rgno(rtg), *write_pointer);
  return false;
 }

 return true;
}

static bool
xfs_zone_validate_full(
 struct blk_zone  *zone,
 struct xfs_rtgroup *rtg,
 xfs_rgblock_t  *write_pointer)
{
 struct xfs_mount *mp = rtg_mount(rtg);

 if (rtg_rmap(rtg)->i_used_blocks > rtg->rtg_extents) {
  xfs_warn(mp, "zone %u has too large used counter (0x%x).",
    rtg_rgno(rtg), rtg_rmap(rtg)->i_used_blocks);
  return false;
 }

 *write_pointer = rtg->rtg_extents;
 return true;
}

static bool
xfs_zone_validate_seq(
 struct blk_zone  *zone,
 struct xfs_rtgroup *rtg,
 xfs_rgblock_t  *write_pointer)
{
 struct xfs_mount *mp = rtg_mount(rtg);

 switch (zone->cond) {
 case BLK_ZONE_COND_EMPTY:
  return xfs_zone_validate_empty(zone, rtg, write_pointer);
 case BLK_ZONE_COND_IMP_OPEN:
 case BLK_ZONE_COND_EXP_OPEN:
 case BLK_ZONE_COND_CLOSED:
  return xfs_zone_validate_wp(zone, rtg, write_pointer);
 case BLK_ZONE_COND_FULL:
  return xfs_zone_validate_full(zone, rtg, write_pointer);
 case BLK_ZONE_COND_NOT_WP:
 case BLK_ZONE_COND_OFFLINE:
 case BLK_ZONE_COND_READONLY:
  xfs_warn(mp, "zone %u has unsupported zone condition 0x%x.",
   rtg_rgno(rtg), zone->cond);
  return false;
 default:
  xfs_warn(mp, "zone %u has unknown zone condition 0x%x.",
   rtg_rgno(rtg), zone->cond);
  return false;
 }
}

static bool
xfs_zone_validate_conv(
 struct blk_zone  *zone,
 struct xfs_rtgroup *rtg)
{
 struct xfs_mount *mp = rtg_mount(rtg);

 switch (zone->cond) {
 case BLK_ZONE_COND_NOT_WP:
  return true;
 default:
  xfs_warn(mp,
"conventional zone %u has unsupported zone condition 0x%x.",
    rtg_rgno(rtg), zone->cond);
  return false;
 }
}

bool
xfs_zone_validate(
 struct blk_zone  *zone,
 struct xfs_rtgroup *rtg,
 xfs_rgblock_t  *write_pointer)
{
 struct xfs_mount *mp = rtg_mount(rtg);
 struct xfs_groups *g = &mp->m_groups[XG_TYPE_RTG];
 uint32_t  expected_size;

 /*
 * Check that the zone capacity matches the rtgroup size stored in the
 * superblock.  Note that all zones including the last one must have a
 * uniform capacity.
 */
 if (XFS_BB_TO_FSB(mp, zone->capacity) != g->blocks) {
  xfs_warn(mp,
"zone %u capacity (0x%llx) does not match RT group size (0x%x).",
   rtg_rgno(rtg), XFS_BB_TO_FSB(mp, zone->capacity),
   g->blocks);
  return false;
 }

 if (g->has_daddr_gaps) {
  expected_size = 1 << g->blklog;
 } else {
  if (zone->len != zone->capacity) {
   xfs_warn(mp,
"zone %u has capacity != size ((0x%llx vs 0x%llx)",
    rtg_rgno(rtg),
    XFS_BB_TO_FSB(mp, zone->len),
    XFS_BB_TO_FSB(mp, zone->capacity));
   return false;
  }
  expected_size = g->blocks;
 }

 if (XFS_BB_TO_FSB(mp, zone->len) != expected_size) {
  xfs_warn(mp,
"zone %u length (0x%llx) does match geometry (0x%x).",
   rtg_rgno(rtg), XFS_BB_TO_FSB(mp, zone->len),
   expected_size);
 }

 switch (zone->type) {
 case BLK_ZONE_TYPE_CONVENTIONAL:
  return xfs_zone_validate_conv(zone, rtg);
 case BLK_ZONE_TYPE_SEQWRITE_REQ:
  return xfs_zone_validate_seq(zone, rtg, write_pointer);
 default:
  xfs_warn(mp, "zoned %u has unsupported type 0x%x.",
   rtg_rgno(rtg), zone->type);
  return false;
 }
}