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 /* 39 * Re-scrub the metadata we repaired, in case there's extra work that 40 * we need to do to check our repair work. If this is NULL, we'll use 41 * the ->scrub function pointer, assuming that the regular scrub is 42 * sufficient. 43 */ 44 int (*repair_eval)(struct xfs_scrub *sc); 45 46 /* Decide if we even have this piece of metadata. */ 47 bool (*has)(struct xfs_mount *); 48 49 /* type describing required/allowed inputs */ 50 enum xchk_type type; 51 }; 52 53 /* Buffer pointers and btree cursors for an entire AG. */ 54 struct xchk_ag { 55 struct xfs_perag *pag; 56 57 /* AG btree roots */ 58 struct xfs_buf *agf_bp; 59 struct xfs_buf *agi_bp; 60 61 /* AG btrees */ 62 struct xfs_btree_cur *bno_cur; 63 struct xfs_btree_cur *cnt_cur; 64 struct xfs_btree_cur *ino_cur; 65 struct xfs_btree_cur *fino_cur; 66 struct xfs_btree_cur *rmap_cur; 67 struct xfs_btree_cur *refc_cur; 68 }; 69 70 struct xfs_scrub { 71 /* General scrub state. */ 72 struct xfs_mount *mp; 73 struct xfs_scrub_metadata *sm; 74 const struct xchk_meta_ops *ops; 75 struct xfs_trans *tp; 76 77 /* File that scrub was called with. */ 78 struct file *file; 79 80 /* 81 * File that is undergoing the scrub operation. This can differ from 82 * the file that scrub was called with if we're checking file-based fs 83 * metadata (e.g. rt bitmaps) or if we're doing a scrub-by-handle for 84 * something that can't be opened directly (e.g. symlinks). 85 */ 86 struct xfs_inode *ip; 87 88 /* Kernel memory buffer used by scrubbers; freed at teardown. */ 89 void *buf; 90 91 /* 92 * Clean up resources owned by whatever is in the buffer. Cleanup can 93 * be deferred with this hook as a means for scrub functions to pass 94 * data to repair functions. This function must not free the buffer 95 * itself. 96 */ 97 void (*buf_cleanup)(void *buf); 98 99 /* xfile used by the scrubbers; freed at teardown. */ 100 struct xfile *xfile; 101 102 /* buffer target for in-memory btrees; also freed at teardown. */ 103 struct xfs_buftarg *xmbtp; 104 105 /* Lock flags for @ip. */ 106 uint ilock_flags; 107 108 /* See the XCHK/XREP state flags below. */ 109 unsigned int flags; 110 111 /* 112 * The XFS_SICK_* flags that correspond to the metadata being scrubbed 113 * or repaired. We will use this mask to update the in-core fs health 114 * status with whatever we find. 115 */ 116 unsigned int sick_mask; 117 118 /* State tracking for single-AG operations. */ 119 struct xchk_ag sa; 120 }; 121 122 /* XCHK state flags grow up from zero, XREP state flags grown down from 2^31 */ 123 #define XCHK_TRY_HARDER (1U << 0) /* can't get resources, try again */ 124 #define XCHK_HAVE_FREEZE_PROT (1U << 1) /* do we have freeze protection? */ 125 #define XCHK_FSGATES_DRAIN (1U << 2) /* defer ops draining enabled */ 126 #define XCHK_NEED_DRAIN (1U << 3) /* scrub needs to drain defer ops */ 127 #define XCHK_FSGATES_QUOTA (1U << 4) /* quota live update enabled */ 128 #define XCHK_FSGATES_DIRENTS (1U << 5) /* directory live update enabled */ 129 #define XREP_RESET_PERAG_RESV (1U << 30) /* must reset AG space reservation */ 130 #define XREP_ALREADY_FIXED (1U << 31) /* checking our repair work */ 131 132 /* 133 * The XCHK_FSGATES* flags reflect functionality in the main filesystem that 134 * are only enabled for this particular online fsck. When not in use, the 135 * features are gated off via dynamic code patching, which is why the state 136 * must be enabled during scrub setup and can only be torn down afterwards. 137 */ 138 #define XCHK_FSGATES_ALL (XCHK_FSGATES_DRAIN | \ 139 XCHK_FSGATES_QUOTA | \ 140 XCHK_FSGATES_DIRENTS) 141 142 /* Metadata scrubbers */ 143 int xchk_tester(struct xfs_scrub *sc); 144 int xchk_superblock(struct xfs_scrub *sc); 145 int xchk_agf(struct xfs_scrub *sc); 146 int xchk_agfl(struct xfs_scrub *sc); 147 int xchk_agi(struct xfs_scrub *sc); 148 int xchk_allocbt(struct xfs_scrub *sc); 149 int xchk_iallocbt(struct xfs_scrub *sc); 150 int xchk_rmapbt(struct xfs_scrub *sc); 151 int xchk_refcountbt(struct xfs_scrub *sc); 152 int xchk_inode(struct xfs_scrub *sc); 153 int xchk_bmap_data(struct xfs_scrub *sc); 154 int xchk_bmap_attr(struct xfs_scrub *sc); 155 int xchk_bmap_cow(struct xfs_scrub *sc); 156 int xchk_directory(struct xfs_scrub *sc); 157 int xchk_xattr(struct xfs_scrub *sc); 158 int xchk_symlink(struct xfs_scrub *sc); 159 int xchk_parent(struct xfs_scrub *sc); 160 #ifdef CONFIG_XFS_RT 161 int xchk_rtbitmap(struct xfs_scrub *sc); 162 int xchk_rtsummary(struct xfs_scrub *sc); 163 #else 164 static inline int 165 xchk_rtbitmap(struct xfs_scrub *sc) 166 { 167 return -ENOENT; 168 } 169 static inline int 170 xchk_rtsummary(struct xfs_scrub *sc) 171 { 172 return -ENOENT; 173 } 174 #endif 175 #ifdef CONFIG_XFS_QUOTA 176 int xchk_quota(struct xfs_scrub *sc); 177 int xchk_quotacheck(struct xfs_scrub *sc); 178 #else 179 static inline int 180 xchk_quota(struct xfs_scrub *sc) 181 { 182 return -ENOENT; 183 } 184 static inline int 185 xchk_quotacheck(struct xfs_scrub *sc) 186 { 187 return -ENOENT; 188 } 189 #endif 190 int xchk_fscounters(struct xfs_scrub *sc); 191 int xchk_nlinks(struct xfs_scrub *sc); 192 193 /* cross-referencing helpers */ 194 void xchk_xref_is_used_space(struct xfs_scrub *sc, xfs_agblock_t agbno, 195 xfs_extlen_t len); 196 void xchk_xref_is_not_inode_chunk(struct xfs_scrub *sc, xfs_agblock_t agbno, 197 xfs_extlen_t len); 198 void xchk_xref_is_inode_chunk(struct xfs_scrub *sc, xfs_agblock_t agbno, 199 xfs_extlen_t len); 200 void xchk_xref_is_only_owned_by(struct xfs_scrub *sc, xfs_agblock_t agbno, 201 xfs_extlen_t len, const struct xfs_owner_info *oinfo); 202 void xchk_xref_is_not_owned_by(struct xfs_scrub *sc, xfs_agblock_t agbno, 203 xfs_extlen_t len, const struct xfs_owner_info *oinfo); 204 void xchk_xref_has_no_owner(struct xfs_scrub *sc, xfs_agblock_t agbno, 205 xfs_extlen_t len); 206 void xchk_xref_is_cow_staging(struct xfs_scrub *sc, xfs_agblock_t bno, 207 xfs_extlen_t len); 208 void xchk_xref_is_not_shared(struct xfs_scrub *sc, xfs_agblock_t bno, 209 xfs_extlen_t len); 210 void xchk_xref_is_not_cow_staging(struct xfs_scrub *sc, xfs_agblock_t bno, 211 xfs_extlen_t len); 212 #ifdef CONFIG_XFS_RT 213 void xchk_xref_is_used_rt_space(struct xfs_scrub *sc, xfs_rtblock_t rtbno, 214 xfs_extlen_t len); 215 #else 216 # define xchk_xref_is_used_rt_space(sc, rtbno, len) do { } while (0) 217 #endif 218 219 #endif /* __XFS_SCRUB_SCRUB_H__ */ 220