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/* SPDX-License-Identifier: GPL-2.0+ */
/*
* Copyright (C) 2019 Oracle. All Rights Reserved.
* Author: Darrick J. Wong <darrick.wong@oracle.com>
*/
#ifndef __XFS_HEALTH_H__
#define __XFS_HEALTH_H__
/*
* In-Core Filesystem Health Assessments
* =====================================
*
* We'd like to be able to summarize the current health status of the
* filesystem so that the administrator knows when it's necessary to schedule
* some downtime for repairs. Until then, we would also like to avoid abrupt
* shutdowns due to corrupt metadata.
*
* The online scrub feature evaluates the health of all filesystem metadata.
* When scrub detects corruption in a piece of metadata it will set the
* corresponding sickness flag, and repair will clear it if successful. If
* problems remain at unmount time, we can also request manual intervention by
* logging a notice to run xfs_repair.
*
* Each health tracking group uses a pair of fields for reporting. The
* "checked" field tell us if a given piece of metadata has ever been examined,
* and the "sick" field tells us if that piece was found to need repairs.
* Therefore we can conclude that for a given sick flag value:
*
* - checked && sick => metadata needs repair
* - checked && !sick => metadata is ok
* - !checked && sick => errors have been observed during normal operation,
* but the metadata has not been checked thoroughly
* - !checked && !sick => has not been examined since mount
*
* Evidence of health problems can be sorted into three basic categories:
*
* a) Primary evidence, which signals that something is defective within the
* general grouping of metadata.
*
* b) Secondary evidence, which are side effects of primary problem but are
* not themselves problems. These can be forgotten when the primary
* health problems are addressed.
*
* c) Indirect evidence, which points to something being wrong in another
* group, but we had to release resources and this is all that's left of
* that state.
*/
struct xfs_mount;
struct xfs_perag;
struct xfs_inode;
struct xfs_fsop_geom;
struct xfs_btree_cur;
struct xfs_da_args;
/* Observable health issues for metadata spanning the entire filesystem. */
#define XFS_SICK_FS_COUNTERS (1 << 0) /* summary counters */
#define XFS_SICK_FS_UQUOTA (1 << 1) /* user quota */
#define XFS_SICK_FS_GQUOTA (1 << 2) /* group quota */
#define XFS_SICK_FS_PQUOTA (1 << 3) /* project quota */
#define XFS_SICK_FS_QUOTACHECK (1 << 4) /* quota counts */
#define XFS_SICK_FS_NLINKS (1 << 5) /* inode link counts */
/* Observable health issues for realtime volume metadata. */
#define XFS_SICK_RT_BITMAP (1 << 0) /* realtime bitmap */
#define XFS_SICK_RT_SUMMARY (1 << 1) /* realtime summary */
/* Observable health issues for AG metadata. */
#define XFS_SICK_AG_SB (1 << 0) /* superblock */
#define XFS_SICK_AG_AGF (1 << 1) /* AGF header */
#define XFS_SICK_AG_AGFL (1 << 2) /* AGFL header */
#define XFS_SICK_AG_AGI (1 << 3) /* AGI header */
#define XFS_SICK_AG_BNOBT (1 << 4) /* free space by block */
#define XFS_SICK_AG_CNTBT (1 << 5) /* free space by length */
#define XFS_SICK_AG_INOBT (1 << 6) /* inode index */
#define XFS_SICK_AG_FINOBT (1 << 7) /* free inode index */
#define XFS_SICK_AG_RMAPBT (1 << 8) /* reverse mappings */
#define XFS_SICK_AG_REFCNTBT (1 << 9) /* reference counts */
/* Observable health issues for inode metadata. */
#define XFS_SICK_INO_CORE (1 << 0) /* inode core */
#define XFS_SICK_INO_BMBTD (1 << 1) /* data fork */
#define XFS_SICK_INO_BMBTA (1 << 2) /* attr fork */
#define XFS_SICK_INO_BMBTC (1 << 3) /* cow fork */
#define XFS_SICK_INO_DIR (1 << 4) /* directory */
#define XFS_SICK_INO_XATTR (1 << 5) /* extended attributes */
#define XFS_SICK_INO_SYMLINK (1 << 6) /* symbolic link remote target */
#define XFS_SICK_INO_PARENT (1 << 7) /* parent pointers */
#define XFS_SICK_INO_BMBTD_ZAPPED (1 << 8) /* data fork erased */
#define XFS_SICK_INO_BMBTA_ZAPPED (1 << 9) /* attr fork erased */
#define XFS_SICK_INO_DIR_ZAPPED (1 << 10) /* directory erased */
#define XFS_SICK_INO_SYMLINK_ZAPPED (1 << 11) /* symlink erased */
/* Primary evidence of health problems in a given group. */
#define XFS_SICK_FS_PRIMARY (XFS_SICK_FS_COUNTERS | \
XFS_SICK_FS_UQUOTA | \
XFS_SICK_FS_GQUOTA | \
XFS_SICK_FS_PQUOTA | \
XFS_SICK_FS_QUOTACHECK | \
XFS_SICK_FS_NLINKS)
#define XFS_SICK_RT_PRIMARY (XFS_SICK_RT_BITMAP | \
XFS_SICK_RT_SUMMARY)
#define XFS_SICK_AG_PRIMARY (XFS_SICK_AG_SB | \
XFS_SICK_AG_AGF | \
XFS_SICK_AG_AGFL | \
XFS_SICK_AG_AGI | \
XFS_SICK_AG_BNOBT | \
XFS_SICK_AG_CNTBT | \
XFS_SICK_AG_INOBT | \
XFS_SICK_AG_FINOBT | \
XFS_SICK_AG_RMAPBT | \
XFS_SICK_AG_REFCNTBT)
#define XFS_SICK_INO_PRIMARY (XFS_SICK_INO_CORE | \
XFS_SICK_INO_BMBTD | \
XFS_SICK_INO_BMBTA | \
XFS_SICK_INO_BMBTC | \
XFS_SICK_INO_DIR | \
XFS_SICK_INO_XATTR | \
XFS_SICK_INO_SYMLINK | \
XFS_SICK_INO_PARENT)
#define XFS_SICK_INO_ZAPPED (XFS_SICK_INO_BMBTD_ZAPPED | \
XFS_SICK_INO_BMBTA_ZAPPED | \
XFS_SICK_INO_DIR_ZAPPED | \
XFS_SICK_INO_SYMLINK_ZAPPED)
/* Secondary state related to (but not primary evidence of) health problems. */
#define XFS_SICK_FS_SECONDARY (0)
#define XFS_SICK_RT_SECONDARY (0)
#define XFS_SICK_AG_SECONDARY (0)
#define XFS_SICK_INO_SECONDARY (0)
/* Evidence of health problems elsewhere. */
#define XFS_SICK_FS_INDIRECT (0)
#define XFS_SICK_RT_INDIRECT (0)
#define XFS_SICK_AG_INDIRECT (0)
#define XFS_SICK_INO_INDIRECT (0)
/* All health masks. */
#define XFS_SICK_FS_ALL (XFS_SICK_FS_PRIMARY | \
XFS_SICK_FS_SECONDARY | \
XFS_SICK_FS_INDIRECT)
#define XFS_SICK_RT_ALL (XFS_SICK_RT_PRIMARY | \
XFS_SICK_RT_SECONDARY | \
XFS_SICK_RT_INDIRECT)
#define XFS_SICK_AG_ALL (XFS_SICK_AG_PRIMARY | \
XFS_SICK_AG_SECONDARY | \
XFS_SICK_AG_INDIRECT)
#define XFS_SICK_INO_ALL (XFS_SICK_INO_PRIMARY | \
XFS_SICK_INO_SECONDARY | \
XFS_SICK_INO_INDIRECT | \
XFS_SICK_INO_ZAPPED)
/*
* These functions must be provided by the xfs implementation. Function
* behavior with respect to the first argument should be as follows:
*
* xfs_*_mark_sick: Set the sick flags and do not set checked flags.
* Runtime code should call this upon encountering
* a corruption.
*
* xfs_*_mark_corrupt: Set the sick and checked flags simultaneously.
* Fsck tools should call this when corruption is
* found.
*
* xfs_*_mark_healthy: Clear the sick flags and set the checked flags.
* Fsck tools should call this after correcting errors.
*
* xfs_*_measure_sickness: Return the sick and check status in the provided
* out parameters.
*/
void xfs_fs_mark_sick(struct xfs_mount *mp, unsigned int mask);
void xfs_fs_mark_corrupt(struct xfs_mount *mp, unsigned int mask);
void xfs_fs_mark_healthy(struct xfs_mount *mp, unsigned int mask);
void xfs_fs_measure_sickness(struct xfs_mount *mp, unsigned int *sick,
unsigned int *checked);
void xfs_rt_mark_sick(struct xfs_mount *mp, unsigned int mask);
void xfs_rt_mark_corrupt(struct xfs_mount *mp, unsigned int mask);
void xfs_rt_mark_healthy(struct xfs_mount *mp, unsigned int mask);
void xfs_rt_measure_sickness(struct xfs_mount *mp, unsigned int *sick,
unsigned int *checked);
void xfs_agno_mark_sick(struct xfs_mount *mp, xfs_agnumber_t agno,
unsigned int mask);
void xfs_ag_mark_sick(struct xfs_perag *pag, unsigned int mask);
void xfs_ag_mark_corrupt(struct xfs_perag *pag, unsigned int mask);
void xfs_ag_mark_healthy(struct xfs_perag *pag, unsigned int mask);
void xfs_ag_measure_sickness(struct xfs_perag *pag, unsigned int *sick,
unsigned int *checked);
void xfs_inode_mark_sick(struct xfs_inode *ip, unsigned int mask);
void xfs_inode_mark_corrupt(struct xfs_inode *ip, unsigned int mask);
void xfs_inode_mark_healthy(struct xfs_inode *ip, unsigned int mask);
void xfs_inode_measure_sickness(struct xfs_inode *ip, unsigned int *sick,
unsigned int *checked);
void xfs_health_unmount(struct xfs_mount *mp);
void xfs_bmap_mark_sick(struct xfs_inode *ip, int whichfork);
void xfs_btree_mark_sick(struct xfs_btree_cur *cur);
void xfs_dirattr_mark_sick(struct xfs_inode *ip, int whichfork);
void xfs_da_mark_sick(struct xfs_da_args *args);
/* Now some helpers. */
static inline bool
xfs_fs_has_sickness(struct xfs_mount *mp, unsigned int mask)
{
unsigned int sick, checked;
xfs_fs_measure_sickness(mp, &sick, &checked);
return sick & mask;
}
static inline bool
xfs_rt_has_sickness(struct xfs_mount *mp, unsigned int mask)
{
unsigned int sick, checked;
xfs_rt_measure_sickness(mp, &sick, &checked);
return sick & mask;
}
static inline bool
xfs_ag_has_sickness(struct xfs_perag *pag, unsigned int mask)
{
unsigned int sick, checked;
xfs_ag_measure_sickness(pag, &sick, &checked);
return sick & mask;
}
static inline bool
xfs_inode_has_sickness(struct xfs_inode *ip, unsigned int mask)
{
unsigned int sick, checked;
xfs_inode_measure_sickness(ip, &sick, &checked);
return sick & mask;
}
static inline bool
xfs_fs_is_healthy(struct xfs_mount *mp)
{
return !xfs_fs_has_sickness(mp, -1U);
}
static inline bool
xfs_rt_is_healthy(struct xfs_mount *mp)
{
return !xfs_rt_has_sickness(mp, -1U);
}
static inline bool
xfs_ag_is_healthy(struct xfs_perag *pag)
{
return !xfs_ag_has_sickness(pag, -1U);
}
static inline bool
xfs_inode_is_healthy(struct xfs_inode *ip)
{
return !xfs_inode_has_sickness(ip, -1U);
}
void xfs_fsop_geom_health(struct xfs_mount *mp, struct xfs_fsop_geom *geo);
void xfs_ag_geom_health(struct xfs_perag *pag, struct xfs_ag_geometry *ageo);
void xfs_bulkstat_health(struct xfs_inode *ip, struct xfs_bulkstat *bs);
#define xfs_metadata_is_sick(error) \
(unlikely((error) == -EFSCORRUPTED || (error) == -EFSBADCRC))
#endif /* __XFS_HEALTH_H__ */
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