1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright (C) 2017-2023 Oracle. All Rights Reserved. 4 * Author: Darrick J. Wong <djwong@kernel.org> 5 */ 6 #ifndef __XFS_SCRUB_SCRUB_H__ 7 #define __XFS_SCRUB_SCRUB_H__ 8 9 struct xfs_scrub; 10 11 /* 12 * Standard flags for allocating memory within scrub. NOFS context is 13 * configured by the process allocation scope. Scrub and repair must be able 14 * to back out gracefully if there isn't enough memory. Force-cast to avoid 15 * complaints from static checkers. 16 */ 17 #define XCHK_GFP_FLAGS ((__force gfp_t)(GFP_KERNEL | __GFP_NOWARN | \ 18 __GFP_RETRY_MAYFAIL)) 19 20 /* Type info and names for the scrub types. */ 21 enum xchk_type { 22 ST_NONE = 1, /* disabled */ 23 ST_PERAG, /* per-AG metadata */ 24 ST_FS, /* per-FS metadata */ 25 ST_INODE, /* per-inode metadata */ 26 }; 27 28 struct xchk_meta_ops { 29 /* Acquire whatever resources are needed for the operation. */ 30 int (*setup)(struct xfs_scrub *sc); 31 32 /* Examine metadata for errors. */ 33 int (*scrub)(struct xfs_scrub *); 34 35 /* Repair or optimize the metadata. */ 36 int (*repair)(struct xfs_scrub *); 37 38 /* Decide if we even have this piece of metadata. */ 39 bool (*has)(struct xfs_mount *); 40 41 /* type describing required/allowed inputs */ 42 enum xchk_type type; 43 }; 44 45 /* Buffer pointers and btree cursors for an entire AG. */ 46 struct xchk_ag { 47 struct xfs_perag *pag; 48 49 /* AG btree roots */ 50 struct xfs_buf *agf_bp; 51 struct xfs_buf *agi_bp; 52 53 /* AG btrees */ 54 struct xfs_btree_cur *bno_cur; 55 struct xfs_btree_cur *cnt_cur; 56 struct xfs_btree_cur *ino_cur; 57 struct xfs_btree_cur *fino_cur; 58 struct xfs_btree_cur *rmap_cur; 59 struct xfs_btree_cur *refc_cur; 60 }; 61 62 struct xfs_scrub { 63 /* General scrub state. */ 64 struct xfs_mount *mp; 65 struct xfs_scrub_metadata *sm; 66 const struct xchk_meta_ops *ops; 67 struct xfs_trans *tp; 68 69 /* File that scrub was called with. */ 70 struct file *file; 71 72 /* 73 * File that is undergoing the scrub operation. This can differ from 74 * the file that scrub was called with if we're checking file-based fs 75 * metadata (e.g. rt bitmaps) or if we're doing a scrub-by-handle for 76 * something that can't be opened directly (e.g. symlinks). 77 */ 78 struct xfs_inode *ip; 79 80 /* Kernel memory buffer used by scrubbers; freed at teardown. */ 81 void *buf; 82 83 /* 84 * Clean up resources owned by whatever is in the buffer. Cleanup can 85 * be deferred with this hook as a means for scrub functions to pass 86 * data to repair functions. This function must not free the buffer 87 * itself. 88 */ 89 void (*buf_cleanup)(void *buf); 90 91 uint ilock_flags; 92 93 /* See the XCHK/XREP state flags below. */ 94 unsigned int flags; 95 96 /* 97 * The XFS_SICK_* flags that correspond to the metadata being scrubbed 98 * or repaired. We will use this mask to update the in-core fs health 99 * status with whatever we find. 100 */ 101 unsigned int sick_mask; 102 103 /* State tracking for single-AG operations. */ 104 struct xchk_ag sa; 105 }; 106 107 /* XCHK state flags grow up from zero, XREP state flags grown down from 2^31 */ 108 #define XCHK_TRY_HARDER (1 << 0) /* can't get resources, try again */ 109 #define XCHK_REAPING_DISABLED (1 << 1) /* background block reaping paused */ 110 #define XCHK_FSGATES_DRAIN (1 << 2) /* defer ops draining enabled */ 111 #define XCHK_NEED_DRAIN (1 << 3) /* scrub needs to drain defer ops */ 112 #define XREP_ALREADY_FIXED (1 << 31) /* checking our repair work */ 113 114 /* 115 * The XCHK_FSGATES* flags reflect functionality in the main filesystem that 116 * are only enabled for this particular online fsck. When not in use, the 117 * features are gated off via dynamic code patching, which is why the state 118 * must be enabled during scrub setup and can only be torn down afterwards. 119 */ 120 #define XCHK_FSGATES_ALL (XCHK_FSGATES_DRAIN) 121 122 /* Metadata scrubbers */ 123 int xchk_tester(struct xfs_scrub *sc); 124 int xchk_superblock(struct xfs_scrub *sc); 125 int xchk_agf(struct xfs_scrub *sc); 126 int xchk_agfl(struct xfs_scrub *sc); 127 int xchk_agi(struct xfs_scrub *sc); 128 int xchk_bnobt(struct xfs_scrub *sc); 129 int xchk_cntbt(struct xfs_scrub *sc); 130 int xchk_inobt(struct xfs_scrub *sc); 131 int xchk_finobt(struct xfs_scrub *sc); 132 int xchk_rmapbt(struct xfs_scrub *sc); 133 int xchk_refcountbt(struct xfs_scrub *sc); 134 int xchk_inode(struct xfs_scrub *sc); 135 int xchk_bmap_data(struct xfs_scrub *sc); 136 int xchk_bmap_attr(struct xfs_scrub *sc); 137 int xchk_bmap_cow(struct xfs_scrub *sc); 138 int xchk_directory(struct xfs_scrub *sc); 139 int xchk_xattr(struct xfs_scrub *sc); 140 int xchk_symlink(struct xfs_scrub *sc); 141 int xchk_parent(struct xfs_scrub *sc); 142 #ifdef CONFIG_XFS_RT 143 int xchk_rtbitmap(struct xfs_scrub *sc); 144 int xchk_rtsummary(struct xfs_scrub *sc); 145 #else 146 static inline int 147 xchk_rtbitmap(struct xfs_scrub *sc) 148 { 149 return -ENOENT; 150 } 151 static inline int 152 xchk_rtsummary(struct xfs_scrub *sc) 153 { 154 return -ENOENT; 155 } 156 #endif 157 #ifdef CONFIG_XFS_QUOTA 158 int xchk_quota(struct xfs_scrub *sc); 159 #else 160 static inline int 161 xchk_quota(struct xfs_scrub *sc) 162 { 163 return -ENOENT; 164 } 165 #endif 166 int xchk_fscounters(struct xfs_scrub *sc); 167 168 /* cross-referencing helpers */ 169 void xchk_xref_is_used_space(struct xfs_scrub *sc, xfs_agblock_t agbno, 170 xfs_extlen_t len); 171 void xchk_xref_is_not_inode_chunk(struct xfs_scrub *sc, xfs_agblock_t agbno, 172 xfs_extlen_t len); 173 void xchk_xref_is_inode_chunk(struct xfs_scrub *sc, xfs_agblock_t agbno, 174 xfs_extlen_t len); 175 void xchk_xref_is_only_owned_by(struct xfs_scrub *sc, xfs_agblock_t agbno, 176 xfs_extlen_t len, const struct xfs_owner_info *oinfo); 177 void xchk_xref_is_not_owned_by(struct xfs_scrub *sc, xfs_agblock_t agbno, 178 xfs_extlen_t len, const struct xfs_owner_info *oinfo); 179 void xchk_xref_has_no_owner(struct xfs_scrub *sc, xfs_agblock_t agbno, 180 xfs_extlen_t len); 181 void xchk_xref_is_cow_staging(struct xfs_scrub *sc, xfs_agblock_t bno, 182 xfs_extlen_t len); 183 void xchk_xref_is_not_shared(struct xfs_scrub *sc, xfs_agblock_t bno, 184 xfs_extlen_t len); 185 void xchk_xref_is_not_cow_staging(struct xfs_scrub *sc, xfs_agblock_t bno, 186 xfs_extlen_t len); 187 #ifdef CONFIG_XFS_RT 188 void xchk_xref_is_used_rt_space(struct xfs_scrub *sc, xfs_rtblock_t rtbno, 189 xfs_extlen_t len); 190 #else 191 # define xchk_xref_is_used_rt_space(sc, rtbno, len) do { } while (0) 192 #endif 193 194 #endif /* __XFS_SCRUB_SCRUB_H__ */ 195