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1// SPDX-License-Identifier: GPL-2.02/*3 * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.4 * All Rights Reserved.5 */6#ifndef __XFS_INODE_FORK_H__7#define __XFS_INODE_FORK_H__8 9struct xfs_inode_log_item;10struct xfs_dinode;11 12/*13 * File incore extent information, present for each of data & attr forks.14 */15struct xfs_ifork {16 int64_t if_bytes; /* bytes in if_data */17 struct xfs_btree_block *if_broot; /* file's incore btree root */18 unsigned int if_seq; /* fork mod counter */19 int if_height; /* height of the extent tree */20 void *if_data; /* extent tree root or21 inline data */22 xfs_extnum_t if_nextents; /* # of extents in this fork */23 short if_broot_bytes; /* bytes allocated for root */24 int8_t if_format; /* format of this fork */25 uint8_t if_needextents; /* extents have not been read */26};27 28/*29 * Worst-case increase in the fork extent count when we're adding a single30 * extent to a fork and there's no possibility of splitting an existing mapping.31 */32#define XFS_IEXT_ADD_NOSPLIT_CNT (1)33 34/*35 * Punching out an extent from the middle of an existing extent can cause the36 * extent count to increase by 1.37 * i.e. | Old extent | Hole | Old extent |38 */39#define XFS_IEXT_PUNCH_HOLE_CNT (1)40 41/*42 * Adding/removing an xattr can cause XFS_DA_NODE_MAXDEPTH extents to43 * be added. One extra extent for dabtree in case a local attr is44 * large enough to cause a double split. It can also cause extent45 * count to increase proportional to the size of a remote xattr's46 * value.47 */48#define XFS_IEXT_ATTR_MANIP_CNT(rmt_blks) \49 (XFS_DA_NODE_MAXDEPTH + max(1, rmt_blks))50 51/*52 * A write to a sub-interval of an existing unwritten extent causes the original53 * extent to be split into 3 extents54 * i.e. | Unwritten | Real | Unwritten |55 * Hence extent count can increase by 2.56 */57#define XFS_IEXT_WRITE_UNWRITTEN_CNT (2)58 59 60/*61 * Moving an extent to data fork can cause a sub-interval of an existing extent62 * to be unmapped. This will increase extent count by 1. Mapping in the new63 * extent can increase the extent count by 1 again i.e.64 * | Old extent | New extent | Old extent |65 * Hence number of extents increases by 2.66 */67#define XFS_IEXT_REFLINK_END_COW_CNT (2)68 69/*70 * Removing an initial range of source/donor file's extent and adding a new71 * extent (from donor/source file) in its place will cause extent count to72 * increase by 1.73 */74#define XFS_IEXT_SWAP_RMAP_CNT (1)75 76/*77 * Fork handling.78 */79#define XFS_IFORK_MAXEXT(ip, w) \80 (xfs_inode_fork_size(ip, w) / sizeof(xfs_bmbt_rec_t))81 82static inline bool xfs_ifork_has_extents(struct xfs_ifork *ifp)83{84 return ifp->if_format == XFS_DINODE_FMT_EXTENTS ||85 ifp->if_format == XFS_DINODE_FMT_BTREE;86}87 88static inline xfs_extnum_t xfs_ifork_nextents(struct xfs_ifork *ifp)89{90 if (!ifp)91 return 0;92 return ifp->if_nextents;93}94 95static inline int8_t xfs_ifork_format(struct xfs_ifork *ifp)96{97 if (!ifp)98 return XFS_DINODE_FMT_EXTENTS;99 return ifp->if_format;100}101 102static inline xfs_extnum_t xfs_iext_max_nextents(bool has_large_extent_counts,103 int whichfork)104{105 switch (whichfork) {106 case XFS_DATA_FORK:107 case XFS_COW_FORK:108 if (has_large_extent_counts)109 return XFS_MAX_EXTCNT_DATA_FORK_LARGE;110 return XFS_MAX_EXTCNT_DATA_FORK_SMALL;111 112 case XFS_ATTR_FORK:113 if (has_large_extent_counts)114 return XFS_MAX_EXTCNT_ATTR_FORK_LARGE;115 return XFS_MAX_EXTCNT_ATTR_FORK_SMALL;116 117 default:118 ASSERT(0);119 return 0;120 }121}122 123static inline xfs_extnum_t124xfs_dfork_data_extents(125 struct xfs_dinode *dip)126{127 if (xfs_dinode_has_large_extent_counts(dip))128 return be64_to_cpu(dip->di_big_nextents);129 130 return be32_to_cpu(dip->di_nextents);131}132 133static inline xfs_extnum_t134xfs_dfork_attr_extents(135 struct xfs_dinode *dip)136{137 if (xfs_dinode_has_large_extent_counts(dip))138 return be32_to_cpu(dip->di_big_anextents);139 140 return be16_to_cpu(dip->di_anextents);141}142 143static inline xfs_extnum_t144xfs_dfork_nextents(145 struct xfs_dinode *dip,146 int whichfork)147{148 switch (whichfork) {149 case XFS_DATA_FORK:150 return xfs_dfork_data_extents(dip);151 case XFS_ATTR_FORK:152 return xfs_dfork_attr_extents(dip);153 default:154 ASSERT(0);155 break;156 }157 158 return 0;159}160 161void xfs_ifork_zap_attr(struct xfs_inode *ip);162void xfs_ifork_init_attr(struct xfs_inode *ip, enum xfs_dinode_fmt format,163 xfs_extnum_t nextents);164struct xfs_ifork *xfs_iext_state_to_fork(struct xfs_inode *ip, int state);165 166int xfs_iformat_data_fork(struct xfs_inode *, struct xfs_dinode *);167int xfs_iformat_attr_fork(struct xfs_inode *, struct xfs_dinode *);168void xfs_iflush_fork(struct xfs_inode *, struct xfs_dinode *,169 struct xfs_inode_log_item *, int);170void xfs_idestroy_fork(struct xfs_ifork *ifp);171void * xfs_idata_realloc(struct xfs_inode *ip, int64_t byte_diff,172 int whichfork);173void xfs_iroot_realloc(struct xfs_inode *, int, int);174int xfs_iread_extents(struct xfs_trans *, struct xfs_inode *, int);175int xfs_iextents_copy(struct xfs_inode *, struct xfs_bmbt_rec *,176 int);177void xfs_init_local_fork(struct xfs_inode *ip, int whichfork,178 const void *data, int64_t size);179 180xfs_extnum_t xfs_iext_count(struct xfs_ifork *ifp);181void xfs_iext_insert_raw(struct xfs_ifork *ifp,182 struct xfs_iext_cursor *cur,183 struct xfs_bmbt_irec *irec);184void xfs_iext_insert(struct xfs_inode *, struct xfs_iext_cursor *cur,185 struct xfs_bmbt_irec *, int);186void xfs_iext_remove(struct xfs_inode *, struct xfs_iext_cursor *,187 int);188void xfs_iext_destroy(struct xfs_ifork *);189 190bool xfs_iext_lookup_extent(struct xfs_inode *ip,191 struct xfs_ifork *ifp, xfs_fileoff_t bno,192 struct xfs_iext_cursor *cur,193 struct xfs_bmbt_irec *gotp);194bool xfs_iext_lookup_extent_before(struct xfs_inode *ip,195 struct xfs_ifork *ifp, xfs_fileoff_t *end,196 struct xfs_iext_cursor *cur,197 struct xfs_bmbt_irec *gotp);198bool xfs_iext_get_extent(struct xfs_ifork *ifp,199 struct xfs_iext_cursor *cur,200 struct xfs_bmbt_irec *gotp);201void xfs_iext_update_extent(struct xfs_inode *ip, int state,202 struct xfs_iext_cursor *cur,203 struct xfs_bmbt_irec *gotp);204 205void xfs_iext_first(struct xfs_ifork *, struct xfs_iext_cursor *);206void xfs_iext_last(struct xfs_ifork *, struct xfs_iext_cursor *);207void xfs_iext_next(struct xfs_ifork *, struct xfs_iext_cursor *);208void xfs_iext_prev(struct xfs_ifork *, struct xfs_iext_cursor *);209 210static inline bool xfs_iext_next_extent(struct xfs_ifork *ifp,211 struct xfs_iext_cursor *cur, struct xfs_bmbt_irec *gotp)212{213 xfs_iext_next(ifp, cur);214 return xfs_iext_get_extent(ifp, cur, gotp);215}216 217static inline bool xfs_iext_prev_extent(struct xfs_ifork *ifp,218 struct xfs_iext_cursor *cur, struct xfs_bmbt_irec *gotp)219{220 xfs_iext_prev(ifp, cur);221 return xfs_iext_get_extent(ifp, cur, gotp);222}223 224/*225 * Return the extent after cur in gotp without updating the cursor.226 */227static inline bool xfs_iext_peek_next_extent(struct xfs_ifork *ifp,228 struct xfs_iext_cursor *cur, struct xfs_bmbt_irec *gotp)229{230 struct xfs_iext_cursor ncur = *cur;231 232 xfs_iext_next(ifp, &ncur);233 return xfs_iext_get_extent(ifp, &ncur, gotp);234}235 236/*237 * Return the extent before cur in gotp without updating the cursor.238 */239static inline bool xfs_iext_peek_prev_extent(struct xfs_ifork *ifp,240 struct xfs_iext_cursor *cur, struct xfs_bmbt_irec *gotp)241{242 struct xfs_iext_cursor ncur = *cur;243 244 xfs_iext_prev(ifp, &ncur);245 return xfs_iext_get_extent(ifp, &ncur, gotp);246}247 248#define for_each_xfs_iext(ifp, ext, got) \249 for (xfs_iext_first((ifp), (ext)); \250 xfs_iext_get_extent((ifp), (ext), (got)); \251 xfs_iext_next((ifp), (ext)))252 253extern struct kmem_cache *xfs_ifork_cache;254 255extern void xfs_ifork_init_cow(struct xfs_inode *ip);256 257int xfs_ifork_verify_local_data(struct xfs_inode *ip);258int xfs_ifork_verify_local_attr(struct xfs_inode *ip);259int xfs_iext_count_extend(struct xfs_trans *tp, struct xfs_inode *ip,260 int whichfork, uint nr_to_add);261bool xfs_ifork_is_realtime(struct xfs_inode *ip, int whichfork);262 263/* returns true if the fork has extents but they are not read in yet. */264static inline bool xfs_need_iread_extents(const struct xfs_ifork *ifp)265{266 /* see xfs_iformat_{data,attr}_fork() for needextents semantics */267 return smp_load_acquire(&ifp->if_needextents) != 0;268}269 270#endif /* __XFS_INODE_FORK_H__ */271