10b61f8a4SDave Chinner // SPDX-License-Identifier: GPL-2.0+ 2bdf28630SDarrick J. Wong /* 3bdf28630SDarrick J. Wong * Copyright (C) 2016 Oracle. All Rights Reserved. 4bdf28630SDarrick J. Wong * Author: Darrick J. Wong <darrick.wong@oracle.com> 5bdf28630SDarrick J. Wong */ 6bdf28630SDarrick J. Wong #include "xfs.h" 7bdf28630SDarrick J. Wong #include "xfs_fs.h" 8bdf28630SDarrick J. Wong #include "xfs_shared.h" 9bdf28630SDarrick J. Wong #include "xfs_format.h" 10bdf28630SDarrick J. Wong #include "xfs_log_format.h" 11bdf28630SDarrick J. Wong #include "xfs_trans_resv.h" 12bdf28630SDarrick J. Wong #include "xfs_mount.h" 13bdf28630SDarrick J. Wong #include "xfs_defer.h" 14bdf28630SDarrick J. Wong #include "xfs_btree.h" 15bdf28630SDarrick J. Wong #include "xfs_bmap.h" 16bdf28630SDarrick J. Wong #include "xfs_refcount_btree.h" 17bdf28630SDarrick J. Wong #include "xfs_alloc.h" 18e9e899a2SDarrick J. Wong #include "xfs_errortag.h" 19bdf28630SDarrick J. Wong #include "xfs_error.h" 20bdf28630SDarrick J. Wong #include "xfs_trace.h" 21bdf28630SDarrick J. Wong #include "xfs_trans.h" 22bdf28630SDarrick J. Wong #include "xfs_bit.h" 23bdf28630SDarrick J. Wong #include "xfs_refcount.h" 24174edb0eSDarrick J. Wong #include "xfs_rmap.h" 25a81a0621SDave Chinner #include "xfs_ag.h" 26bdf28630SDarrick J. Wong 27f3c799c2SDarrick J. Wong struct kmem_cache *xfs_refcount_intent_cache; 28f3c799c2SDarrick J. Wong 2931727258SDarrick J. Wong /* Allowable refcount adjustment amounts. */ 3031727258SDarrick J. Wong enum xfs_refc_adjust_op { 3131727258SDarrick J. Wong XFS_REFCOUNT_ADJUST_INCREASE = 1, 3231727258SDarrick J. Wong XFS_REFCOUNT_ADJUST_DECREASE = -1, 33174edb0eSDarrick J. Wong XFS_REFCOUNT_ADJUST_COW_ALLOC = 0, 34174edb0eSDarrick J. Wong XFS_REFCOUNT_ADJUST_COW_FREE = -1, 3531727258SDarrick J. Wong }; 3631727258SDarrick J. Wong 37174edb0eSDarrick J. Wong STATIC int __xfs_refcount_cow_alloc(struct xfs_btree_cur *rcur, 380f37d178SBrian Foster xfs_agblock_t agbno, xfs_extlen_t aglen); 39174edb0eSDarrick J. Wong STATIC int __xfs_refcount_cow_free(struct xfs_btree_cur *rcur, 400f37d178SBrian Foster xfs_agblock_t agbno, xfs_extlen_t aglen); 41174edb0eSDarrick J. Wong 42bdf28630SDarrick J. Wong /* 43bdf28630SDarrick J. Wong * Look up the first record less than or equal to [bno, len] in the btree 44bdf28630SDarrick J. Wong * given by cur. 45bdf28630SDarrick J. Wong */ 46bdf28630SDarrick J. Wong int 47bdf28630SDarrick J. Wong xfs_refcount_lookup_le( 48bdf28630SDarrick J. Wong struct xfs_btree_cur *cur, 49bdf28630SDarrick J. Wong xfs_agblock_t bno, 50bdf28630SDarrick J. Wong int *stat) 51bdf28630SDarrick J. Wong { 5250f02fe3SDave Chinner trace_xfs_refcount_lookup(cur->bc_mp, cur->bc_ag.pag->pag_agno, bno, 53bdf28630SDarrick J. Wong XFS_LOOKUP_LE); 54bdf28630SDarrick J. Wong cur->bc_rec.rc.rc_startblock = bno; 55bdf28630SDarrick J. Wong cur->bc_rec.rc.rc_blockcount = 0; 56bdf28630SDarrick J. Wong return xfs_btree_lookup(cur, XFS_LOOKUP_LE, stat); 57bdf28630SDarrick J. Wong } 58bdf28630SDarrick J. Wong 59bdf28630SDarrick J. Wong /* 60bdf28630SDarrick J. Wong * Look up the first record greater than or equal to [bno, len] in the btree 61bdf28630SDarrick J. Wong * given by cur. 62bdf28630SDarrick J. Wong */ 63bdf28630SDarrick J. Wong int 64bdf28630SDarrick J. Wong xfs_refcount_lookup_ge( 65bdf28630SDarrick J. Wong struct xfs_btree_cur *cur, 66bdf28630SDarrick J. Wong xfs_agblock_t bno, 67bdf28630SDarrick J. Wong int *stat) 68bdf28630SDarrick J. Wong { 6950f02fe3SDave Chinner trace_xfs_refcount_lookup(cur->bc_mp, cur->bc_ag.pag->pag_agno, bno, 70bdf28630SDarrick J. Wong XFS_LOOKUP_GE); 71bdf28630SDarrick J. Wong cur->bc_rec.rc.rc_startblock = bno; 72bdf28630SDarrick J. Wong cur->bc_rec.rc.rc_blockcount = 0; 73bdf28630SDarrick J. Wong return xfs_btree_lookup(cur, XFS_LOOKUP_GE, stat); 74bdf28630SDarrick J. Wong } 75bdf28630SDarrick J. Wong 7608daa3ccSDarrick J. Wong /* 7708daa3ccSDarrick J. Wong * Look up the first record equal to [bno, len] in the btree 7808daa3ccSDarrick J. Wong * given by cur. 7908daa3ccSDarrick J. Wong */ 8008daa3ccSDarrick J. Wong int 8108daa3ccSDarrick J. Wong xfs_refcount_lookup_eq( 8208daa3ccSDarrick J. Wong struct xfs_btree_cur *cur, 8308daa3ccSDarrick J. Wong xfs_agblock_t bno, 8408daa3ccSDarrick J. Wong int *stat) 8508daa3ccSDarrick J. Wong { 8650f02fe3SDave Chinner trace_xfs_refcount_lookup(cur->bc_mp, cur->bc_ag.pag->pag_agno, bno, 8708daa3ccSDarrick J. Wong XFS_LOOKUP_LE); 8808daa3ccSDarrick J. Wong cur->bc_rec.rc.rc_startblock = bno; 8908daa3ccSDarrick J. Wong cur->bc_rec.rc.rc_blockcount = 0; 9008daa3ccSDarrick J. Wong return xfs_btree_lookup(cur, XFS_LOOKUP_EQ, stat); 9108daa3ccSDarrick J. Wong } 9208daa3ccSDarrick J. Wong 93174edb0eSDarrick J. Wong /* Convert on-disk record to in-core format. */ 947f8f1313SDarrick J. Wong void 95174edb0eSDarrick J. Wong xfs_refcount_btrec_to_irec( 96159eb69dSDarrick J. Wong const union xfs_btree_rec *rec, 97174edb0eSDarrick J. Wong struct xfs_refcount_irec *irec) 98174edb0eSDarrick J. Wong { 99174edb0eSDarrick J. Wong irec->rc_startblock = be32_to_cpu(rec->refc.rc_startblock); 100174edb0eSDarrick J. Wong irec->rc_blockcount = be32_to_cpu(rec->refc.rc_blockcount); 101174edb0eSDarrick J. Wong irec->rc_refcount = be32_to_cpu(rec->refc.rc_refcount); 102174edb0eSDarrick J. Wong } 103174edb0eSDarrick J. Wong 104bdf28630SDarrick J. Wong /* 105bdf28630SDarrick J. Wong * Get the data from the pointed-to record. 106bdf28630SDarrick J. Wong */ 107bdf28630SDarrick J. Wong int 108bdf28630SDarrick J. Wong xfs_refcount_get_rec( 109bdf28630SDarrick J. Wong struct xfs_btree_cur *cur, 110bdf28630SDarrick J. Wong struct xfs_refcount_irec *irec, 111bdf28630SDarrick J. Wong int *stat) 112bdf28630SDarrick J. Wong { 1139e6c08d4SDave Chinner struct xfs_mount *mp = cur->bc_mp; 11450f02fe3SDave Chinner xfs_agnumber_t agno = cur->bc_ag.pag->pag_agno; 115bdf28630SDarrick J. Wong union xfs_btree_rec *rec; 116bdf28630SDarrick J. Wong int error; 1179e6c08d4SDave Chinner xfs_agblock_t realstart; 118bdf28630SDarrick J. Wong 119bdf28630SDarrick J. Wong error = xfs_btree_get_rec(cur, &rec, stat); 1209e6c08d4SDave Chinner if (error || !*stat) 121bdf28630SDarrick J. Wong return error; 1229e6c08d4SDave Chinner 1239e6c08d4SDave Chinner xfs_refcount_btrec_to_irec(rec, irec); 1249e6c08d4SDave Chinner 12550f02fe3SDave Chinner agno = cur->bc_ag.pag->pag_agno; 1269e6c08d4SDave Chinner if (irec->rc_blockcount == 0 || irec->rc_blockcount > MAXREFCEXTLEN) 1279e6c08d4SDave Chinner goto out_bad_rec; 1289e6c08d4SDave Chinner 1299e6c08d4SDave Chinner /* handle special COW-staging state */ 1309e6c08d4SDave Chinner realstart = irec->rc_startblock; 1319e6c08d4SDave Chinner if (realstart & XFS_REFC_COW_START) { 1329e6c08d4SDave Chinner if (irec->rc_refcount != 1) 1339e6c08d4SDave Chinner goto out_bad_rec; 1349e6c08d4SDave Chinner realstart &= ~XFS_REFC_COW_START; 1359e6c08d4SDave Chinner } else if (irec->rc_refcount < 2) { 1369e6c08d4SDave Chinner goto out_bad_rec; 1379e6c08d4SDave Chinner } 1389e6c08d4SDave Chinner 1399e6c08d4SDave Chinner /* check for valid extent range, including overflow */ 1409e6c08d4SDave Chinner if (!xfs_verify_agbno(mp, agno, realstart)) 1419e6c08d4SDave Chinner goto out_bad_rec; 1429e6c08d4SDave Chinner if (realstart > realstart + irec->rc_blockcount) 1439e6c08d4SDave Chinner goto out_bad_rec; 1449e6c08d4SDave Chinner if (!xfs_verify_agbno(mp, agno, realstart + irec->rc_blockcount - 1)) 1459e6c08d4SDave Chinner goto out_bad_rec; 1469e6c08d4SDave Chinner 1479e6c08d4SDave Chinner if (irec->rc_refcount == 0 || irec->rc_refcount > MAXREFCOUNT) 1489e6c08d4SDave Chinner goto out_bad_rec; 1499e6c08d4SDave Chinner 15050f02fe3SDave Chinner trace_xfs_refcount_get(cur->bc_mp, cur->bc_ag.pag->pag_agno, irec); 1519e6c08d4SDave Chinner return 0; 1529e6c08d4SDave Chinner 1539e6c08d4SDave Chinner out_bad_rec: 1549e6c08d4SDave Chinner xfs_warn(mp, 1559e6c08d4SDave Chinner "Refcount BTree record corruption in AG %d detected!", agno); 1569e6c08d4SDave Chinner xfs_warn(mp, 1579e6c08d4SDave Chinner "Start block 0x%x, block count 0x%x, references 0x%x", 1589e6c08d4SDave Chinner irec->rc_startblock, irec->rc_blockcount, irec->rc_refcount); 1599e6c08d4SDave Chinner return -EFSCORRUPTED; 160bdf28630SDarrick J. Wong } 161bdf28630SDarrick J. Wong 162bdf28630SDarrick J. Wong /* 163bdf28630SDarrick J. Wong * Update the record referred to by cur to the value given 164bdf28630SDarrick J. Wong * by [bno, len, refcount]. 165bdf28630SDarrick J. Wong * This either works (return 0) or gets an EFSCORRUPTED error. 166bdf28630SDarrick J. Wong */ 167bdf28630SDarrick J. Wong STATIC int 168bdf28630SDarrick J. Wong xfs_refcount_update( 169bdf28630SDarrick J. Wong struct xfs_btree_cur *cur, 170bdf28630SDarrick J. Wong struct xfs_refcount_irec *irec) 171bdf28630SDarrick J. Wong { 172bdf28630SDarrick J. Wong union xfs_btree_rec rec; 173bdf28630SDarrick J. Wong int error; 174bdf28630SDarrick J. Wong 17550f02fe3SDave Chinner trace_xfs_refcount_update(cur->bc_mp, cur->bc_ag.pag->pag_agno, irec); 176bdf28630SDarrick J. Wong rec.refc.rc_startblock = cpu_to_be32(irec->rc_startblock); 177bdf28630SDarrick J. Wong rec.refc.rc_blockcount = cpu_to_be32(irec->rc_blockcount); 178bdf28630SDarrick J. Wong rec.refc.rc_refcount = cpu_to_be32(irec->rc_refcount); 179bdf28630SDarrick J. Wong error = xfs_btree_update(cur, &rec); 180bdf28630SDarrick J. Wong if (error) 181bdf28630SDarrick J. Wong trace_xfs_refcount_update_error(cur->bc_mp, 18250f02fe3SDave Chinner cur->bc_ag.pag->pag_agno, error, _RET_IP_); 183bdf28630SDarrick J. Wong return error; 184bdf28630SDarrick J. Wong } 185bdf28630SDarrick J. Wong 186bdf28630SDarrick J. Wong /* 187bdf28630SDarrick J. Wong * Insert the record referred to by cur to the value given 188bdf28630SDarrick J. Wong * by [bno, len, refcount]. 189bdf28630SDarrick J. Wong * This either works (return 0) or gets an EFSCORRUPTED error. 190bdf28630SDarrick J. Wong */ 1917f8f1313SDarrick J. Wong int 192bdf28630SDarrick J. Wong xfs_refcount_insert( 193bdf28630SDarrick J. Wong struct xfs_btree_cur *cur, 194bdf28630SDarrick J. Wong struct xfs_refcount_irec *irec, 195bdf28630SDarrick J. Wong int *i) 196bdf28630SDarrick J. Wong { 197bdf28630SDarrick J. Wong int error; 198bdf28630SDarrick J. Wong 19950f02fe3SDave Chinner trace_xfs_refcount_insert(cur->bc_mp, cur->bc_ag.pag->pag_agno, irec); 200bdf28630SDarrick J. Wong cur->bc_rec.rc.rc_startblock = irec->rc_startblock; 201bdf28630SDarrick J. Wong cur->bc_rec.rc.rc_blockcount = irec->rc_blockcount; 202bdf28630SDarrick J. Wong cur->bc_rec.rc.rc_refcount = irec->rc_refcount; 203bdf28630SDarrick J. Wong error = xfs_btree_insert(cur, i); 20416858f7cSDave Chinner if (error) 20516858f7cSDave Chinner goto out_error; 206f9e03706SDarrick J. Wong if (XFS_IS_CORRUPT(cur->bc_mp, *i != 1)) { 207f9e03706SDarrick J. Wong error = -EFSCORRUPTED; 208f9e03706SDarrick J. Wong goto out_error; 209f9e03706SDarrick J. Wong } 21016858f7cSDave Chinner 211bdf28630SDarrick J. Wong out_error: 212bdf28630SDarrick J. Wong if (error) 213bdf28630SDarrick J. Wong trace_xfs_refcount_insert_error(cur->bc_mp, 21450f02fe3SDave Chinner cur->bc_ag.pag->pag_agno, error, _RET_IP_); 215bdf28630SDarrick J. Wong return error; 216bdf28630SDarrick J. Wong } 217bdf28630SDarrick J. Wong 218bdf28630SDarrick J. Wong /* 219bdf28630SDarrick J. Wong * Remove the record referred to by cur, then set the pointer to the spot 220bdf28630SDarrick J. Wong * where the record could be re-inserted, in case we want to increment or 221bdf28630SDarrick J. Wong * decrement the cursor. 222bdf28630SDarrick J. Wong * This either works (return 0) or gets an EFSCORRUPTED error. 223bdf28630SDarrick J. Wong */ 224bdf28630SDarrick J. Wong STATIC int 225bdf28630SDarrick J. Wong xfs_refcount_delete( 226bdf28630SDarrick J. Wong struct xfs_btree_cur *cur, 227bdf28630SDarrick J. Wong int *i) 228bdf28630SDarrick J. Wong { 229bdf28630SDarrick J. Wong struct xfs_refcount_irec irec; 230bdf28630SDarrick J. Wong int found_rec; 231bdf28630SDarrick J. Wong int error; 232bdf28630SDarrick J. Wong 233bdf28630SDarrick J. Wong error = xfs_refcount_get_rec(cur, &irec, &found_rec); 234bdf28630SDarrick J. Wong if (error) 235bdf28630SDarrick J. Wong goto out_error; 236f9e03706SDarrick J. Wong if (XFS_IS_CORRUPT(cur->bc_mp, found_rec != 1)) { 237f9e03706SDarrick J. Wong error = -EFSCORRUPTED; 238f9e03706SDarrick J. Wong goto out_error; 239f9e03706SDarrick J. Wong } 24050f02fe3SDave Chinner trace_xfs_refcount_delete(cur->bc_mp, cur->bc_ag.pag->pag_agno, &irec); 241bdf28630SDarrick J. Wong error = xfs_btree_delete(cur, i); 242f9e03706SDarrick J. Wong if (XFS_IS_CORRUPT(cur->bc_mp, *i != 1)) { 243f9e03706SDarrick J. Wong error = -EFSCORRUPTED; 244f9e03706SDarrick J. Wong goto out_error; 245f9e03706SDarrick J. Wong } 246bdf28630SDarrick J. Wong if (error) 247bdf28630SDarrick J. Wong goto out_error; 248bdf28630SDarrick J. Wong error = xfs_refcount_lookup_ge(cur, irec.rc_startblock, &found_rec); 249bdf28630SDarrick J. Wong out_error: 250bdf28630SDarrick J. Wong if (error) 251bdf28630SDarrick J. Wong trace_xfs_refcount_delete_error(cur->bc_mp, 25250f02fe3SDave Chinner cur->bc_ag.pag->pag_agno, error, _RET_IP_); 253bdf28630SDarrick J. Wong return error; 254bdf28630SDarrick J. Wong } 25531727258SDarrick J. Wong 25631727258SDarrick J. Wong /* 25731727258SDarrick J. Wong * Adjusting the Reference Count 25831727258SDarrick J. Wong * 25931727258SDarrick J. Wong * As stated elsewhere, the reference count btree (refcbt) stores 26031727258SDarrick J. Wong * >1 reference counts for extents of physical blocks. In this 26131727258SDarrick J. Wong * operation, we're either raising or lowering the reference count of 26231727258SDarrick J. Wong * some subrange stored in the tree: 26331727258SDarrick J. Wong * 26431727258SDarrick J. Wong * <------ adjustment range ------> 26531727258SDarrick J. Wong * ----+ +---+-----+ +--+--------+--------- 26631727258SDarrick J. Wong * 2 | | 3 | 4 | |17| 55 | 10 26731727258SDarrick J. Wong * ----+ +---+-----+ +--+--------+--------- 26831727258SDarrick J. Wong * X axis is physical blocks number; 26931727258SDarrick J. Wong * reference counts are the numbers inside the rectangles 27031727258SDarrick J. Wong * 27131727258SDarrick J. Wong * The first thing we need to do is to ensure that there are no 27231727258SDarrick J. Wong * refcount extents crossing either boundary of the range to be 27331727258SDarrick J. Wong * adjusted. For any extent that does cross a boundary, split it into 27431727258SDarrick J. Wong * two extents so that we can increment the refcount of one of the 27531727258SDarrick J. Wong * pieces later: 27631727258SDarrick J. Wong * 27731727258SDarrick J. Wong * <------ adjustment range ------> 27831727258SDarrick J. Wong * ----+ +---+-----+ +--+--------+----+---- 27931727258SDarrick J. Wong * 2 | | 3 | 2 | |17| 55 | 10 | 10 28031727258SDarrick J. Wong * ----+ +---+-----+ +--+--------+----+---- 28131727258SDarrick J. Wong * 28231727258SDarrick J. Wong * For this next step, let's assume that all the physical blocks in 28331727258SDarrick J. Wong * the adjustment range are mapped to a file and are therefore in use 28431727258SDarrick J. Wong * at least once. Therefore, we can infer that any gap in the 28531727258SDarrick J. Wong * refcount tree within the adjustment range represents a physical 28631727258SDarrick J. Wong * extent with refcount == 1: 28731727258SDarrick J. Wong * 28831727258SDarrick J. Wong * <------ adjustment range ------> 28931727258SDarrick J. Wong * ----+---+---+-----+-+--+--------+----+---- 29031727258SDarrick J. Wong * 2 |"1"| 3 | 2 |1|17| 55 | 10 | 10 29131727258SDarrick J. Wong * ----+---+---+-----+-+--+--------+----+---- 29231727258SDarrick J. Wong * ^ 29331727258SDarrick J. Wong * 29431727258SDarrick J. Wong * For each extent that falls within the interval range, figure out 29531727258SDarrick J. Wong * which extent is to the left or the right of that extent. Now we 29631727258SDarrick J. Wong * have a left, current, and right extent. If the new reference count 29731727258SDarrick J. Wong * of the center extent enables us to merge left, center, and right 29831727258SDarrick J. Wong * into one record covering all three, do so. If the center extent is 29931727258SDarrick J. Wong * at the left end of the range, abuts the left extent, and its new 30031727258SDarrick J. Wong * reference count matches the left extent's record, then merge them. 30131727258SDarrick J. Wong * If the center extent is at the right end of the range, abuts the 30231727258SDarrick J. Wong * right extent, and the reference counts match, merge those. In the 30331727258SDarrick J. Wong * example, we can left merge (assuming an increment operation): 30431727258SDarrick J. Wong * 30531727258SDarrick J. Wong * <------ adjustment range ------> 30631727258SDarrick J. Wong * --------+---+-----+-+--+--------+----+---- 30731727258SDarrick J. Wong * 2 | 3 | 2 |1|17| 55 | 10 | 10 30831727258SDarrick J. Wong * --------+---+-----+-+--+--------+----+---- 30931727258SDarrick J. Wong * ^ 31031727258SDarrick J. Wong * 31131727258SDarrick J. Wong * For all other extents within the range, adjust the reference count 31231727258SDarrick J. Wong * or delete it if the refcount falls below 2. If we were 31331727258SDarrick J. Wong * incrementing, the end result looks like this: 31431727258SDarrick J. Wong * 31531727258SDarrick J. Wong * <------ adjustment range ------> 31631727258SDarrick J. Wong * --------+---+-----+-+--+--------+----+---- 31731727258SDarrick J. Wong * 2 | 4 | 3 |2|18| 56 | 11 | 10 31831727258SDarrick J. Wong * --------+---+-----+-+--+--------+----+---- 31931727258SDarrick J. Wong * 32031727258SDarrick J. Wong * The result of a decrement operation looks as such: 32131727258SDarrick J. Wong * 32231727258SDarrick J. Wong * <------ adjustment range ------> 32331727258SDarrick J. Wong * ----+ +---+ +--+--------+----+---- 32431727258SDarrick J. Wong * 2 | | 2 | |16| 54 | 9 | 10 32531727258SDarrick J. Wong * ----+ +---+ +--+--------+----+---- 32631727258SDarrick J. Wong * DDDD 111111DD 32731727258SDarrick J. Wong * 32831727258SDarrick J. Wong * The blocks marked "D" are freed; the blocks marked "1" are only 32931727258SDarrick J. Wong * referenced once and therefore the record is removed from the 33031727258SDarrick J. Wong * refcount btree. 33131727258SDarrick J. Wong */ 33231727258SDarrick J. Wong 33331727258SDarrick J. Wong /* Next block after this extent. */ 33431727258SDarrick J. Wong static inline xfs_agblock_t 33531727258SDarrick J. Wong xfs_refc_next( 33631727258SDarrick J. Wong struct xfs_refcount_irec *rc) 33731727258SDarrick J. Wong { 33831727258SDarrick J. Wong return rc->rc_startblock + rc->rc_blockcount; 33931727258SDarrick J. Wong } 34031727258SDarrick J. Wong 34131727258SDarrick J. Wong /* 34231727258SDarrick J. Wong * Split a refcount extent that crosses agbno. 34331727258SDarrick J. Wong */ 34431727258SDarrick J. Wong STATIC int 34531727258SDarrick J. Wong xfs_refcount_split_extent( 34631727258SDarrick J. Wong struct xfs_btree_cur *cur, 34731727258SDarrick J. Wong xfs_agblock_t agbno, 34831727258SDarrick J. Wong bool *shape_changed) 34931727258SDarrick J. Wong { 35031727258SDarrick J. Wong struct xfs_refcount_irec rcext, tmp; 35131727258SDarrick J. Wong int found_rec; 35231727258SDarrick J. Wong int error; 35331727258SDarrick J. Wong 35431727258SDarrick J. Wong *shape_changed = false; 35531727258SDarrick J. Wong error = xfs_refcount_lookup_le(cur, agbno, &found_rec); 35631727258SDarrick J. Wong if (error) 35731727258SDarrick J. Wong goto out_error; 35831727258SDarrick J. Wong if (!found_rec) 35931727258SDarrick J. Wong return 0; 36031727258SDarrick J. Wong 36131727258SDarrick J. Wong error = xfs_refcount_get_rec(cur, &rcext, &found_rec); 36231727258SDarrick J. Wong if (error) 36331727258SDarrick J. Wong goto out_error; 364f9e03706SDarrick J. Wong if (XFS_IS_CORRUPT(cur->bc_mp, found_rec != 1)) { 365f9e03706SDarrick J. Wong error = -EFSCORRUPTED; 366f9e03706SDarrick J. Wong goto out_error; 367f9e03706SDarrick J. Wong } 36831727258SDarrick J. Wong if (rcext.rc_startblock == agbno || xfs_refc_next(&rcext) <= agbno) 36931727258SDarrick J. Wong return 0; 37031727258SDarrick J. Wong 37131727258SDarrick J. Wong *shape_changed = true; 37250f02fe3SDave Chinner trace_xfs_refcount_split_extent(cur->bc_mp, cur->bc_ag.pag->pag_agno, 37331727258SDarrick J. Wong &rcext, agbno); 37431727258SDarrick J. Wong 37531727258SDarrick J. Wong /* Establish the right extent. */ 37631727258SDarrick J. Wong tmp = rcext; 37731727258SDarrick J. Wong tmp.rc_startblock = agbno; 37831727258SDarrick J. Wong tmp.rc_blockcount -= (agbno - rcext.rc_startblock); 37931727258SDarrick J. Wong error = xfs_refcount_update(cur, &tmp); 38031727258SDarrick J. Wong if (error) 38131727258SDarrick J. Wong goto out_error; 38231727258SDarrick J. Wong 38331727258SDarrick J. Wong /* Insert the left extent. */ 38431727258SDarrick J. Wong tmp = rcext; 38531727258SDarrick J. Wong tmp.rc_blockcount = agbno - rcext.rc_startblock; 38631727258SDarrick J. Wong error = xfs_refcount_insert(cur, &tmp, &found_rec); 38731727258SDarrick J. Wong if (error) 38831727258SDarrick J. Wong goto out_error; 389f9e03706SDarrick J. Wong if (XFS_IS_CORRUPT(cur->bc_mp, found_rec != 1)) { 390f9e03706SDarrick J. Wong error = -EFSCORRUPTED; 391f9e03706SDarrick J. Wong goto out_error; 392f9e03706SDarrick J. Wong } 39331727258SDarrick J. Wong return error; 39431727258SDarrick J. Wong 39531727258SDarrick J. Wong out_error: 39631727258SDarrick J. Wong trace_xfs_refcount_split_extent_error(cur->bc_mp, 39750f02fe3SDave Chinner cur->bc_ag.pag->pag_agno, error, _RET_IP_); 39831727258SDarrick J. Wong return error; 39931727258SDarrick J. Wong } 40031727258SDarrick J. Wong 40131727258SDarrick J. Wong /* 40231727258SDarrick J. Wong * Merge the left, center, and right extents. 40331727258SDarrick J. Wong */ 40431727258SDarrick J. Wong STATIC int 40531727258SDarrick J. Wong xfs_refcount_merge_center_extents( 40631727258SDarrick J. Wong struct xfs_btree_cur *cur, 40731727258SDarrick J. Wong struct xfs_refcount_irec *left, 40831727258SDarrick J. Wong struct xfs_refcount_irec *center, 40931727258SDarrick J. Wong struct xfs_refcount_irec *right, 41031727258SDarrick J. Wong unsigned long long extlen, 41131727258SDarrick J. Wong xfs_extlen_t *aglen) 41231727258SDarrick J. Wong { 41331727258SDarrick J. Wong int error; 41431727258SDarrick J. Wong int found_rec; 41531727258SDarrick J. Wong 41631727258SDarrick J. Wong trace_xfs_refcount_merge_center_extents(cur->bc_mp, 41750f02fe3SDave Chinner cur->bc_ag.pag->pag_agno, left, center, right); 41831727258SDarrick J. Wong 41931727258SDarrick J. Wong /* 42031727258SDarrick J. Wong * Make sure the center and right extents are not in the btree. 42131727258SDarrick J. Wong * If the center extent was synthesized, the first delete call 42231727258SDarrick J. Wong * removes the right extent and we skip the second deletion. 42331727258SDarrick J. Wong * If center and right were in the btree, then the first delete 42431727258SDarrick J. Wong * call removes the center and the second one removes the right 42531727258SDarrick J. Wong * extent. 42631727258SDarrick J. Wong */ 42731727258SDarrick J. Wong error = xfs_refcount_lookup_ge(cur, center->rc_startblock, 42831727258SDarrick J. Wong &found_rec); 42931727258SDarrick J. Wong if (error) 43031727258SDarrick J. Wong goto out_error; 431f9e03706SDarrick J. Wong if (XFS_IS_CORRUPT(cur->bc_mp, found_rec != 1)) { 432f9e03706SDarrick J. Wong error = -EFSCORRUPTED; 433f9e03706SDarrick J. Wong goto out_error; 434f9e03706SDarrick J. Wong } 43531727258SDarrick J. Wong 43631727258SDarrick J. Wong error = xfs_refcount_delete(cur, &found_rec); 43731727258SDarrick J. Wong if (error) 43831727258SDarrick J. Wong goto out_error; 439f9e03706SDarrick J. Wong if (XFS_IS_CORRUPT(cur->bc_mp, found_rec != 1)) { 440f9e03706SDarrick J. Wong error = -EFSCORRUPTED; 441f9e03706SDarrick J. Wong goto out_error; 442f9e03706SDarrick J. Wong } 44331727258SDarrick J. Wong 44431727258SDarrick J. Wong if (center->rc_refcount > 1) { 44531727258SDarrick J. Wong error = xfs_refcount_delete(cur, &found_rec); 44631727258SDarrick J. Wong if (error) 44731727258SDarrick J. Wong goto out_error; 448f9e03706SDarrick J. Wong if (XFS_IS_CORRUPT(cur->bc_mp, found_rec != 1)) { 449f9e03706SDarrick J. Wong error = -EFSCORRUPTED; 450f9e03706SDarrick J. Wong goto out_error; 451f9e03706SDarrick J. Wong } 45231727258SDarrick J. Wong } 45331727258SDarrick J. Wong 45431727258SDarrick J. Wong /* Enlarge the left extent. */ 45531727258SDarrick J. Wong error = xfs_refcount_lookup_le(cur, left->rc_startblock, 45631727258SDarrick J. Wong &found_rec); 45731727258SDarrick J. Wong if (error) 45831727258SDarrick J. Wong goto out_error; 459f9e03706SDarrick J. Wong if (XFS_IS_CORRUPT(cur->bc_mp, found_rec != 1)) { 460f9e03706SDarrick J. Wong error = -EFSCORRUPTED; 461f9e03706SDarrick J. Wong goto out_error; 462f9e03706SDarrick J. Wong } 46331727258SDarrick J. Wong 46431727258SDarrick J. Wong left->rc_blockcount = extlen; 46531727258SDarrick J. Wong error = xfs_refcount_update(cur, left); 46631727258SDarrick J. Wong if (error) 46731727258SDarrick J. Wong goto out_error; 46831727258SDarrick J. Wong 46931727258SDarrick J. Wong *aglen = 0; 47031727258SDarrick J. Wong return error; 47131727258SDarrick J. Wong 47231727258SDarrick J. Wong out_error: 47331727258SDarrick J. Wong trace_xfs_refcount_merge_center_extents_error(cur->bc_mp, 47450f02fe3SDave Chinner cur->bc_ag.pag->pag_agno, error, _RET_IP_); 47531727258SDarrick J. Wong return error; 47631727258SDarrick J. Wong } 47731727258SDarrick J. Wong 47831727258SDarrick J. Wong /* 47931727258SDarrick J. Wong * Merge with the left extent. 48031727258SDarrick J. Wong */ 48131727258SDarrick J. Wong STATIC int 48231727258SDarrick J. Wong xfs_refcount_merge_left_extent( 48331727258SDarrick J. Wong struct xfs_btree_cur *cur, 48431727258SDarrick J. Wong struct xfs_refcount_irec *left, 48531727258SDarrick J. Wong struct xfs_refcount_irec *cleft, 48631727258SDarrick J. Wong xfs_agblock_t *agbno, 48731727258SDarrick J. Wong xfs_extlen_t *aglen) 48831727258SDarrick J. Wong { 48931727258SDarrick J. Wong int error; 49031727258SDarrick J. Wong int found_rec; 49131727258SDarrick J. Wong 49231727258SDarrick J. Wong trace_xfs_refcount_merge_left_extent(cur->bc_mp, 49350f02fe3SDave Chinner cur->bc_ag.pag->pag_agno, left, cleft); 49431727258SDarrick J. Wong 49531727258SDarrick J. Wong /* If the extent at agbno (cleft) wasn't synthesized, remove it. */ 49631727258SDarrick J. Wong if (cleft->rc_refcount > 1) { 49731727258SDarrick J. Wong error = xfs_refcount_lookup_le(cur, cleft->rc_startblock, 49831727258SDarrick J. Wong &found_rec); 49931727258SDarrick J. Wong if (error) 50031727258SDarrick J. Wong goto out_error; 501f9e03706SDarrick J. Wong if (XFS_IS_CORRUPT(cur->bc_mp, found_rec != 1)) { 502f9e03706SDarrick J. Wong error = -EFSCORRUPTED; 503f9e03706SDarrick J. Wong goto out_error; 504f9e03706SDarrick J. Wong } 50531727258SDarrick J. Wong 50631727258SDarrick J. Wong error = xfs_refcount_delete(cur, &found_rec); 50731727258SDarrick J. Wong if (error) 50831727258SDarrick J. Wong goto out_error; 509f9e03706SDarrick J. Wong if (XFS_IS_CORRUPT(cur->bc_mp, found_rec != 1)) { 510f9e03706SDarrick J. Wong error = -EFSCORRUPTED; 511f9e03706SDarrick J. Wong goto out_error; 512f9e03706SDarrick J. Wong } 51331727258SDarrick J. Wong } 51431727258SDarrick J. Wong 51531727258SDarrick J. Wong /* Enlarge the left extent. */ 51631727258SDarrick J. Wong error = xfs_refcount_lookup_le(cur, left->rc_startblock, 51731727258SDarrick J. Wong &found_rec); 51831727258SDarrick J. Wong if (error) 51931727258SDarrick J. Wong goto out_error; 520f9e03706SDarrick J. Wong if (XFS_IS_CORRUPT(cur->bc_mp, found_rec != 1)) { 521f9e03706SDarrick J. Wong error = -EFSCORRUPTED; 522f9e03706SDarrick J. Wong goto out_error; 523f9e03706SDarrick J. Wong } 52431727258SDarrick J. Wong 52531727258SDarrick J. Wong left->rc_blockcount += cleft->rc_blockcount; 52631727258SDarrick J. Wong error = xfs_refcount_update(cur, left); 52731727258SDarrick J. Wong if (error) 52831727258SDarrick J. Wong goto out_error; 52931727258SDarrick J. Wong 53031727258SDarrick J. Wong *agbno += cleft->rc_blockcount; 53131727258SDarrick J. Wong *aglen -= cleft->rc_blockcount; 53231727258SDarrick J. Wong return error; 53331727258SDarrick J. Wong 53431727258SDarrick J. Wong out_error: 53531727258SDarrick J. Wong trace_xfs_refcount_merge_left_extent_error(cur->bc_mp, 53650f02fe3SDave Chinner cur->bc_ag.pag->pag_agno, error, _RET_IP_); 53731727258SDarrick J. Wong return error; 53831727258SDarrick J. Wong } 53931727258SDarrick J. Wong 54031727258SDarrick J. Wong /* 54131727258SDarrick J. Wong * Merge with the right extent. 54231727258SDarrick J. Wong */ 54331727258SDarrick J. Wong STATIC int 54431727258SDarrick J. Wong xfs_refcount_merge_right_extent( 54531727258SDarrick J. Wong struct xfs_btree_cur *cur, 54631727258SDarrick J. Wong struct xfs_refcount_irec *right, 54731727258SDarrick J. Wong struct xfs_refcount_irec *cright, 54831727258SDarrick J. Wong xfs_extlen_t *aglen) 54931727258SDarrick J. Wong { 55031727258SDarrick J. Wong int error; 55131727258SDarrick J. Wong int found_rec; 55231727258SDarrick J. Wong 55331727258SDarrick J. Wong trace_xfs_refcount_merge_right_extent(cur->bc_mp, 55450f02fe3SDave Chinner cur->bc_ag.pag->pag_agno, cright, right); 55531727258SDarrick J. Wong 55631727258SDarrick J. Wong /* 55731727258SDarrick J. Wong * If the extent ending at agbno+aglen (cright) wasn't synthesized, 55831727258SDarrick J. Wong * remove it. 55931727258SDarrick J. Wong */ 56031727258SDarrick J. Wong if (cright->rc_refcount > 1) { 56131727258SDarrick J. Wong error = xfs_refcount_lookup_le(cur, cright->rc_startblock, 56231727258SDarrick J. Wong &found_rec); 56331727258SDarrick J. Wong if (error) 56431727258SDarrick J. Wong goto out_error; 565f9e03706SDarrick J. Wong if (XFS_IS_CORRUPT(cur->bc_mp, found_rec != 1)) { 566f9e03706SDarrick J. Wong error = -EFSCORRUPTED; 567f9e03706SDarrick J. Wong goto out_error; 568f9e03706SDarrick J. Wong } 56931727258SDarrick J. Wong 57031727258SDarrick J. Wong error = xfs_refcount_delete(cur, &found_rec); 57131727258SDarrick J. Wong if (error) 57231727258SDarrick J. Wong goto out_error; 573f9e03706SDarrick J. Wong if (XFS_IS_CORRUPT(cur->bc_mp, found_rec != 1)) { 574f9e03706SDarrick J. Wong error = -EFSCORRUPTED; 575f9e03706SDarrick J. Wong goto out_error; 576f9e03706SDarrick J. Wong } 57731727258SDarrick J. Wong } 57831727258SDarrick J. Wong 57931727258SDarrick J. Wong /* Enlarge the right extent. */ 58031727258SDarrick J. Wong error = xfs_refcount_lookup_le(cur, right->rc_startblock, 58131727258SDarrick J. Wong &found_rec); 58231727258SDarrick J. Wong if (error) 58331727258SDarrick J. Wong goto out_error; 584f9e03706SDarrick J. Wong if (XFS_IS_CORRUPT(cur->bc_mp, found_rec != 1)) { 585f9e03706SDarrick J. Wong error = -EFSCORRUPTED; 586f9e03706SDarrick J. Wong goto out_error; 587f9e03706SDarrick J. Wong } 58831727258SDarrick J. Wong 58931727258SDarrick J. Wong right->rc_startblock -= cright->rc_blockcount; 59031727258SDarrick J. Wong right->rc_blockcount += cright->rc_blockcount; 59131727258SDarrick J. Wong error = xfs_refcount_update(cur, right); 59231727258SDarrick J. Wong if (error) 59331727258SDarrick J. Wong goto out_error; 59431727258SDarrick J. Wong 59531727258SDarrick J. Wong *aglen -= cright->rc_blockcount; 59631727258SDarrick J. Wong return error; 59731727258SDarrick J. Wong 59831727258SDarrick J. Wong out_error: 59931727258SDarrick J. Wong trace_xfs_refcount_merge_right_extent_error(cur->bc_mp, 60050f02fe3SDave Chinner cur->bc_ag.pag->pag_agno, error, _RET_IP_); 60131727258SDarrick J. Wong return error; 60231727258SDarrick J. Wong } 60331727258SDarrick J. Wong 604174edb0eSDarrick J. Wong #define XFS_FIND_RCEXT_SHARED 1 605174edb0eSDarrick J. Wong #define XFS_FIND_RCEXT_COW 2 60631727258SDarrick J. Wong /* 60731727258SDarrick J. Wong * Find the left extent and the one after it (cleft). This function assumes 60831727258SDarrick J. Wong * that we've already split any extent crossing agbno. 60931727258SDarrick J. Wong */ 61031727258SDarrick J. Wong STATIC int 61131727258SDarrick J. Wong xfs_refcount_find_left_extents( 61231727258SDarrick J. Wong struct xfs_btree_cur *cur, 61331727258SDarrick J. Wong struct xfs_refcount_irec *left, 61431727258SDarrick J. Wong struct xfs_refcount_irec *cleft, 61531727258SDarrick J. Wong xfs_agblock_t agbno, 616174edb0eSDarrick J. Wong xfs_extlen_t aglen, 617174edb0eSDarrick J. Wong int flags) 61831727258SDarrick J. Wong { 61931727258SDarrick J. Wong struct xfs_refcount_irec tmp; 62031727258SDarrick J. Wong int error; 62131727258SDarrick J. Wong int found_rec; 62231727258SDarrick J. Wong 62331727258SDarrick J. Wong left->rc_startblock = cleft->rc_startblock = NULLAGBLOCK; 62431727258SDarrick J. Wong error = xfs_refcount_lookup_le(cur, agbno - 1, &found_rec); 62531727258SDarrick J. Wong if (error) 62631727258SDarrick J. Wong goto out_error; 62731727258SDarrick J. Wong if (!found_rec) 62831727258SDarrick J. Wong return 0; 62931727258SDarrick J. Wong 63031727258SDarrick J. Wong error = xfs_refcount_get_rec(cur, &tmp, &found_rec); 63131727258SDarrick J. Wong if (error) 63231727258SDarrick J. Wong goto out_error; 633f9e03706SDarrick J. Wong if (XFS_IS_CORRUPT(cur->bc_mp, found_rec != 1)) { 634f9e03706SDarrick J. Wong error = -EFSCORRUPTED; 635f9e03706SDarrick J. Wong goto out_error; 636f9e03706SDarrick J. Wong } 63731727258SDarrick J. Wong 63831727258SDarrick J. Wong if (xfs_refc_next(&tmp) != agbno) 63931727258SDarrick J. Wong return 0; 640174edb0eSDarrick J. Wong if ((flags & XFS_FIND_RCEXT_SHARED) && tmp.rc_refcount < 2) 641174edb0eSDarrick J. Wong return 0; 642174edb0eSDarrick J. Wong if ((flags & XFS_FIND_RCEXT_COW) && tmp.rc_refcount > 1) 643174edb0eSDarrick J. Wong return 0; 64431727258SDarrick J. Wong /* We have a left extent; retrieve (or invent) the next right one */ 64531727258SDarrick J. Wong *left = tmp; 64631727258SDarrick J. Wong 64731727258SDarrick J. Wong error = xfs_btree_increment(cur, 0, &found_rec); 64831727258SDarrick J. Wong if (error) 64931727258SDarrick J. Wong goto out_error; 65031727258SDarrick J. Wong if (found_rec) { 65131727258SDarrick J. Wong error = xfs_refcount_get_rec(cur, &tmp, &found_rec); 65231727258SDarrick J. Wong if (error) 65331727258SDarrick J. Wong goto out_error; 654f9e03706SDarrick J. Wong if (XFS_IS_CORRUPT(cur->bc_mp, found_rec != 1)) { 655f9e03706SDarrick J. Wong error = -EFSCORRUPTED; 656f9e03706SDarrick J. Wong goto out_error; 657f9e03706SDarrick J. Wong } 65831727258SDarrick J. Wong 65931727258SDarrick J. Wong /* if tmp starts at the end of our range, just use that */ 66031727258SDarrick J. Wong if (tmp.rc_startblock == agbno) 66131727258SDarrick J. Wong *cleft = tmp; 66231727258SDarrick J. Wong else { 66331727258SDarrick J. Wong /* 66431727258SDarrick J. Wong * There's a gap in the refcntbt at the start of the 66531727258SDarrick J. Wong * range we're interested in (refcount == 1) so 66631727258SDarrick J. Wong * synthesize the implied extent and pass it back. 66731727258SDarrick J. Wong * We assume here that the agbno/aglen range was 66831727258SDarrick J. Wong * passed in from a data fork extent mapping and 66931727258SDarrick J. Wong * therefore is allocated to exactly one owner. 67031727258SDarrick J. Wong */ 67131727258SDarrick J. Wong cleft->rc_startblock = agbno; 67231727258SDarrick J. Wong cleft->rc_blockcount = min(aglen, 67331727258SDarrick J. Wong tmp.rc_startblock - agbno); 67431727258SDarrick J. Wong cleft->rc_refcount = 1; 67531727258SDarrick J. Wong } 67631727258SDarrick J. Wong } else { 67731727258SDarrick J. Wong /* 67831727258SDarrick J. Wong * No extents, so pretend that there's one covering the whole 67931727258SDarrick J. Wong * range. 68031727258SDarrick J. Wong */ 68131727258SDarrick J. Wong cleft->rc_startblock = agbno; 68231727258SDarrick J. Wong cleft->rc_blockcount = aglen; 68331727258SDarrick J. Wong cleft->rc_refcount = 1; 68431727258SDarrick J. Wong } 68550f02fe3SDave Chinner trace_xfs_refcount_find_left_extent(cur->bc_mp, cur->bc_ag.pag->pag_agno, 68631727258SDarrick J. Wong left, cleft, agbno); 68731727258SDarrick J. Wong return error; 68831727258SDarrick J. Wong 68931727258SDarrick J. Wong out_error: 69031727258SDarrick J. Wong trace_xfs_refcount_find_left_extent_error(cur->bc_mp, 69150f02fe3SDave Chinner cur->bc_ag.pag->pag_agno, error, _RET_IP_); 69231727258SDarrick J. Wong return error; 69331727258SDarrick J. Wong } 69431727258SDarrick J. Wong 69531727258SDarrick J. Wong /* 69631727258SDarrick J. Wong * Find the right extent and the one before it (cright). This function 69731727258SDarrick J. Wong * assumes that we've already split any extents crossing agbno + aglen. 69831727258SDarrick J. Wong */ 69931727258SDarrick J. Wong STATIC int 70031727258SDarrick J. Wong xfs_refcount_find_right_extents( 70131727258SDarrick J. Wong struct xfs_btree_cur *cur, 70231727258SDarrick J. Wong struct xfs_refcount_irec *right, 70331727258SDarrick J. Wong struct xfs_refcount_irec *cright, 70431727258SDarrick J. Wong xfs_agblock_t agbno, 705174edb0eSDarrick J. Wong xfs_extlen_t aglen, 706174edb0eSDarrick J. Wong int flags) 70731727258SDarrick J. Wong { 70831727258SDarrick J. Wong struct xfs_refcount_irec tmp; 70931727258SDarrick J. Wong int error; 71031727258SDarrick J. Wong int found_rec; 71131727258SDarrick J. Wong 71231727258SDarrick J. Wong right->rc_startblock = cright->rc_startblock = NULLAGBLOCK; 71331727258SDarrick J. Wong error = xfs_refcount_lookup_ge(cur, agbno + aglen, &found_rec); 71431727258SDarrick J. Wong if (error) 71531727258SDarrick J. Wong goto out_error; 71631727258SDarrick J. Wong if (!found_rec) 71731727258SDarrick J. Wong return 0; 71831727258SDarrick J. Wong 71931727258SDarrick J. Wong error = xfs_refcount_get_rec(cur, &tmp, &found_rec); 72031727258SDarrick J. Wong if (error) 72131727258SDarrick J. Wong goto out_error; 722f9e03706SDarrick J. Wong if (XFS_IS_CORRUPT(cur->bc_mp, found_rec != 1)) { 723f9e03706SDarrick J. Wong error = -EFSCORRUPTED; 724f9e03706SDarrick J. Wong goto out_error; 725f9e03706SDarrick J. Wong } 72631727258SDarrick J. Wong 72731727258SDarrick J. Wong if (tmp.rc_startblock != agbno + aglen) 72831727258SDarrick J. Wong return 0; 729174edb0eSDarrick J. Wong if ((flags & XFS_FIND_RCEXT_SHARED) && tmp.rc_refcount < 2) 730174edb0eSDarrick J. Wong return 0; 731174edb0eSDarrick J. Wong if ((flags & XFS_FIND_RCEXT_COW) && tmp.rc_refcount > 1) 732174edb0eSDarrick J. Wong return 0; 73331727258SDarrick J. Wong /* We have a right extent; retrieve (or invent) the next left one */ 73431727258SDarrick J. Wong *right = tmp; 73531727258SDarrick J. Wong 73631727258SDarrick J. Wong error = xfs_btree_decrement(cur, 0, &found_rec); 73731727258SDarrick J. Wong if (error) 73831727258SDarrick J. Wong goto out_error; 73931727258SDarrick J. Wong if (found_rec) { 74031727258SDarrick J. Wong error = xfs_refcount_get_rec(cur, &tmp, &found_rec); 74131727258SDarrick J. Wong if (error) 74231727258SDarrick J. Wong goto out_error; 743f9e03706SDarrick J. Wong if (XFS_IS_CORRUPT(cur->bc_mp, found_rec != 1)) { 744f9e03706SDarrick J. Wong error = -EFSCORRUPTED; 745f9e03706SDarrick J. Wong goto out_error; 746f9e03706SDarrick J. Wong } 74731727258SDarrick J. Wong 74831727258SDarrick J. Wong /* if tmp ends at the end of our range, just use that */ 74931727258SDarrick J. Wong if (xfs_refc_next(&tmp) == agbno + aglen) 75031727258SDarrick J. Wong *cright = tmp; 75131727258SDarrick J. Wong else { 75231727258SDarrick J. Wong /* 75331727258SDarrick J. Wong * There's a gap in the refcntbt at the end of the 75431727258SDarrick J. Wong * range we're interested in (refcount == 1) so 75531727258SDarrick J. Wong * create the implied extent and pass it back. 75631727258SDarrick J. Wong * We assume here that the agbno/aglen range was 75731727258SDarrick J. Wong * passed in from a data fork extent mapping and 75831727258SDarrick J. Wong * therefore is allocated to exactly one owner. 75931727258SDarrick J. Wong */ 76031727258SDarrick J. Wong cright->rc_startblock = max(agbno, xfs_refc_next(&tmp)); 76131727258SDarrick J. Wong cright->rc_blockcount = right->rc_startblock - 76231727258SDarrick J. Wong cright->rc_startblock; 76331727258SDarrick J. Wong cright->rc_refcount = 1; 76431727258SDarrick J. Wong } 76531727258SDarrick J. Wong } else { 76631727258SDarrick J. Wong /* 76731727258SDarrick J. Wong * No extents, so pretend that there's one covering the whole 76831727258SDarrick J. Wong * range. 76931727258SDarrick J. Wong */ 77031727258SDarrick J. Wong cright->rc_startblock = agbno; 77131727258SDarrick J. Wong cright->rc_blockcount = aglen; 77231727258SDarrick J. Wong cright->rc_refcount = 1; 77331727258SDarrick J. Wong } 77450f02fe3SDave Chinner trace_xfs_refcount_find_right_extent(cur->bc_mp, cur->bc_ag.pag->pag_agno, 77531727258SDarrick J. Wong cright, right, agbno + aglen); 77631727258SDarrick J. Wong return error; 77731727258SDarrick J. Wong 77831727258SDarrick J. Wong out_error: 77931727258SDarrick J. Wong trace_xfs_refcount_find_right_extent_error(cur->bc_mp, 78050f02fe3SDave Chinner cur->bc_ag.pag->pag_agno, error, _RET_IP_); 78131727258SDarrick J. Wong return error; 78231727258SDarrick J. Wong } 78331727258SDarrick J. Wong 78431727258SDarrick J. Wong /* Is this extent valid? */ 78531727258SDarrick J. Wong static inline bool 78631727258SDarrick J. Wong xfs_refc_valid( 78731727258SDarrick J. Wong struct xfs_refcount_irec *rc) 78831727258SDarrick J. Wong { 78931727258SDarrick J. Wong return rc->rc_startblock != NULLAGBLOCK; 79031727258SDarrick J. Wong } 79131727258SDarrick J. Wong 79231727258SDarrick J. Wong /* 79331727258SDarrick J. Wong * Try to merge with any extents on the boundaries of the adjustment range. 79431727258SDarrick J. Wong */ 79531727258SDarrick J. Wong STATIC int 79631727258SDarrick J. Wong xfs_refcount_merge_extents( 79731727258SDarrick J. Wong struct xfs_btree_cur *cur, 79831727258SDarrick J. Wong xfs_agblock_t *agbno, 79931727258SDarrick J. Wong xfs_extlen_t *aglen, 80031727258SDarrick J. Wong enum xfs_refc_adjust_op adjust, 801174edb0eSDarrick J. Wong int flags, 80231727258SDarrick J. Wong bool *shape_changed) 80331727258SDarrick J. Wong { 80431727258SDarrick J. Wong struct xfs_refcount_irec left = {0}, cleft = {0}; 80531727258SDarrick J. Wong struct xfs_refcount_irec cright = {0}, right = {0}; 80631727258SDarrick J. Wong int error; 80731727258SDarrick J. Wong unsigned long long ulen; 80831727258SDarrick J. Wong bool cequal; 80931727258SDarrick J. Wong 81031727258SDarrick J. Wong *shape_changed = false; 81131727258SDarrick J. Wong /* 81231727258SDarrick J. Wong * Find the extent just below agbno [left], just above agbno [cleft], 81331727258SDarrick J. Wong * just below (agbno + aglen) [cright], and just above (agbno + aglen) 81431727258SDarrick J. Wong * [right]. 81531727258SDarrick J. Wong */ 81631727258SDarrick J. Wong error = xfs_refcount_find_left_extents(cur, &left, &cleft, *agbno, 817174edb0eSDarrick J. Wong *aglen, flags); 81831727258SDarrick J. Wong if (error) 81931727258SDarrick J. Wong return error; 82031727258SDarrick J. Wong error = xfs_refcount_find_right_extents(cur, &right, &cright, *agbno, 821174edb0eSDarrick J. Wong *aglen, flags); 82231727258SDarrick J. Wong if (error) 82331727258SDarrick J. Wong return error; 82431727258SDarrick J. Wong 82531727258SDarrick J. Wong /* No left or right extent to merge; exit. */ 82631727258SDarrick J. Wong if (!xfs_refc_valid(&left) && !xfs_refc_valid(&right)) 82731727258SDarrick J. Wong return 0; 82831727258SDarrick J. Wong 82931727258SDarrick J. Wong cequal = (cleft.rc_startblock == cright.rc_startblock) && 83031727258SDarrick J. Wong (cleft.rc_blockcount == cright.rc_blockcount); 83131727258SDarrick J. Wong 83231727258SDarrick J. Wong /* Try to merge left, cleft, and right. cleft must == cright. */ 83331727258SDarrick J. Wong ulen = (unsigned long long)left.rc_blockcount + cleft.rc_blockcount + 83431727258SDarrick J. Wong right.rc_blockcount; 83531727258SDarrick J. Wong if (xfs_refc_valid(&left) && xfs_refc_valid(&right) && 83631727258SDarrick J. Wong xfs_refc_valid(&cleft) && xfs_refc_valid(&cright) && cequal && 83731727258SDarrick J. Wong left.rc_refcount == cleft.rc_refcount + adjust && 83831727258SDarrick J. Wong right.rc_refcount == cleft.rc_refcount + adjust && 83931727258SDarrick J. Wong ulen < MAXREFCEXTLEN) { 84031727258SDarrick J. Wong *shape_changed = true; 84131727258SDarrick J. Wong return xfs_refcount_merge_center_extents(cur, &left, &cleft, 842a1f69417SEric Sandeen &right, ulen, aglen); 84331727258SDarrick J. Wong } 84431727258SDarrick J. Wong 84531727258SDarrick J. Wong /* Try to merge left and cleft. */ 84631727258SDarrick J. Wong ulen = (unsigned long long)left.rc_blockcount + cleft.rc_blockcount; 84731727258SDarrick J. Wong if (xfs_refc_valid(&left) && xfs_refc_valid(&cleft) && 84831727258SDarrick J. Wong left.rc_refcount == cleft.rc_refcount + adjust && 84931727258SDarrick J. Wong ulen < MAXREFCEXTLEN) { 85031727258SDarrick J. Wong *shape_changed = true; 85131727258SDarrick J. Wong error = xfs_refcount_merge_left_extent(cur, &left, &cleft, 85231727258SDarrick J. Wong agbno, aglen); 85331727258SDarrick J. Wong if (error) 85431727258SDarrick J. Wong return error; 85531727258SDarrick J. Wong 85631727258SDarrick J. Wong /* 85731727258SDarrick J. Wong * If we just merged left + cleft and cleft == cright, 85831727258SDarrick J. Wong * we no longer have a cright to merge with right. We're done. 85931727258SDarrick J. Wong */ 86031727258SDarrick J. Wong if (cequal) 86131727258SDarrick J. Wong return 0; 86231727258SDarrick J. Wong } 86331727258SDarrick J. Wong 86431727258SDarrick J. Wong /* Try to merge cright and right. */ 86531727258SDarrick J. Wong ulen = (unsigned long long)right.rc_blockcount + cright.rc_blockcount; 86631727258SDarrick J. Wong if (xfs_refc_valid(&right) && xfs_refc_valid(&cright) && 86731727258SDarrick J. Wong right.rc_refcount == cright.rc_refcount + adjust && 86831727258SDarrick J. Wong ulen < MAXREFCEXTLEN) { 86931727258SDarrick J. Wong *shape_changed = true; 87031727258SDarrick J. Wong return xfs_refcount_merge_right_extent(cur, &right, &cright, 871a1f69417SEric Sandeen aglen); 87231727258SDarrick J. Wong } 87331727258SDarrick J. Wong 87431727258SDarrick J. Wong return error; 87531727258SDarrick J. Wong } 87631727258SDarrick J. Wong 87731727258SDarrick J. Wong /* 87831727258SDarrick J. Wong * XXX: This is a pretty hand-wavy estimate. The penalty for guessing 87931727258SDarrick J. Wong * true incorrectly is a shutdown FS; the penalty for guessing false 88031727258SDarrick J. Wong * incorrectly is more transaction rolls than might be necessary. 88131727258SDarrick J. Wong * Be conservative here. 88231727258SDarrick J. Wong */ 88331727258SDarrick J. Wong static bool 88431727258SDarrick J. Wong xfs_refcount_still_have_space( 88531727258SDarrick J. Wong struct xfs_btree_cur *cur) 88631727258SDarrick J. Wong { 88731727258SDarrick J. Wong unsigned long overhead; 88831727258SDarrick J. Wong 889b037c4eeSDarrick J. Wong /* 890b037c4eeSDarrick J. Wong * Worst case estimate: full splits of the free space and rmap btrees 891b037c4eeSDarrick J. Wong * to handle each of the shape changes to the refcount btree. 892b037c4eeSDarrick J. Wong */ 8936ed7e509SDarrick J. Wong overhead = xfs_allocfree_block_count(cur->bc_mp, 894b037c4eeSDarrick J. Wong cur->bc_ag.refc.shape_changes); 895b037c4eeSDarrick J. Wong overhead += cur->bc_mp->m_refc_maxlevels; 89631727258SDarrick J. Wong overhead *= cur->bc_mp->m_sb.sb_blocksize; 89731727258SDarrick J. Wong 89831727258SDarrick J. Wong /* 89931727258SDarrick J. Wong * Only allow 2 refcount extent updates per transaction if the 90031727258SDarrick J. Wong * refcount continue update "error" has been injected. 90131727258SDarrick J. Wong */ 902c4aa10d0SDave Chinner if (cur->bc_ag.refc.nr_ops > 2 && 90331727258SDarrick J. Wong XFS_TEST_ERROR(false, cur->bc_mp, 9049e24cfd0SDarrick J. Wong XFS_ERRTAG_REFCOUNT_CONTINUE_UPDATE)) 90531727258SDarrick J. Wong return false; 90631727258SDarrick J. Wong 907c4aa10d0SDave Chinner if (cur->bc_ag.refc.nr_ops == 0) 90831727258SDarrick J. Wong return true; 90931727258SDarrick J. Wong else if (overhead > cur->bc_tp->t_log_res) 91031727258SDarrick J. Wong return false; 91131727258SDarrick J. Wong return cur->bc_tp->t_log_res - overhead > 912c4aa10d0SDave Chinner cur->bc_ag.refc.nr_ops * XFS_REFCOUNT_ITEM_OVERHEAD; 91331727258SDarrick J. Wong } 91431727258SDarrick J. Wong 91531727258SDarrick J. Wong /* 91631727258SDarrick J. Wong * Adjust the refcounts of middle extents. At this point we should have 91731727258SDarrick J. Wong * split extents that crossed the adjustment range; merged with adjacent 91831727258SDarrick J. Wong * extents; and updated agbno/aglen to reflect the merges. Therefore, 91931727258SDarrick J. Wong * all we have to do is update the extents inside [agbno, agbno + aglen]. 92031727258SDarrick J. Wong */ 92131727258SDarrick J. Wong STATIC int 92231727258SDarrick J. Wong xfs_refcount_adjust_extents( 92331727258SDarrick J. Wong struct xfs_btree_cur *cur, 92431727258SDarrick J. Wong xfs_agblock_t *agbno, 92531727258SDarrick J. Wong xfs_extlen_t *aglen, 926c04c51c5SDarrick J. Wong enum xfs_refc_adjust_op adj) 92731727258SDarrick J. Wong { 92831727258SDarrick J. Wong struct xfs_refcount_irec ext, tmp; 92931727258SDarrick J. Wong int error; 93031727258SDarrick J. Wong int found_rec, found_tmp; 93131727258SDarrick J. Wong xfs_fsblock_t fsbno; 93231727258SDarrick J. Wong 93331727258SDarrick J. Wong /* Merging did all the work already. */ 93431727258SDarrick J. Wong if (*aglen == 0) 93531727258SDarrick J. Wong return 0; 93631727258SDarrick J. Wong 93731727258SDarrick J. Wong error = xfs_refcount_lookup_ge(cur, *agbno, &found_rec); 93831727258SDarrick J. Wong if (error) 93931727258SDarrick J. Wong goto out_error; 94031727258SDarrick J. Wong 94131727258SDarrick J. Wong while (*aglen > 0 && xfs_refcount_still_have_space(cur)) { 94231727258SDarrick J. Wong error = xfs_refcount_get_rec(cur, &ext, &found_rec); 94331727258SDarrick J. Wong if (error) 94431727258SDarrick J. Wong goto out_error; 94531727258SDarrick J. Wong if (!found_rec) { 94631727258SDarrick J. Wong ext.rc_startblock = cur->bc_mp->m_sb.sb_agblocks; 94731727258SDarrick J. Wong ext.rc_blockcount = 0; 94831727258SDarrick J. Wong ext.rc_refcount = 0; 94931727258SDarrick J. Wong } 95031727258SDarrick J. Wong 95131727258SDarrick J. Wong /* 95231727258SDarrick J. Wong * Deal with a hole in the refcount tree; if a file maps to 95331727258SDarrick J. Wong * these blocks and there's no refcountbt record, pretend that 95431727258SDarrick J. Wong * there is one with refcount == 1. 95531727258SDarrick J. Wong */ 95631727258SDarrick J. Wong if (ext.rc_startblock != *agbno) { 95731727258SDarrick J. Wong tmp.rc_startblock = *agbno; 95831727258SDarrick J. Wong tmp.rc_blockcount = min(*aglen, 95931727258SDarrick J. Wong ext.rc_startblock - *agbno); 96031727258SDarrick J. Wong tmp.rc_refcount = 1 + adj; 96131727258SDarrick J. Wong trace_xfs_refcount_modify_extent(cur->bc_mp, 96250f02fe3SDave Chinner cur->bc_ag.pag->pag_agno, &tmp); 96331727258SDarrick J. Wong 96431727258SDarrick J. Wong /* 96531727258SDarrick J. Wong * Either cover the hole (increment) or 96631727258SDarrick J. Wong * delete the range (decrement). 96731727258SDarrick J. Wong */ 968c47260d4SDarrick J. Wong cur->bc_ag.refc.nr_ops++; 96931727258SDarrick J. Wong if (tmp.rc_refcount) { 97031727258SDarrick J. Wong error = xfs_refcount_insert(cur, &tmp, 97131727258SDarrick J. Wong &found_tmp); 97231727258SDarrick J. Wong if (error) 97331727258SDarrick J. Wong goto out_error; 974f9e03706SDarrick J. Wong if (XFS_IS_CORRUPT(cur->bc_mp, 975f9e03706SDarrick J. Wong found_tmp != 1)) { 976f9e03706SDarrick J. Wong error = -EFSCORRUPTED; 977f9e03706SDarrick J. Wong goto out_error; 978f9e03706SDarrick J. Wong } 97931727258SDarrick J. Wong } else { 98031727258SDarrick J. Wong fsbno = XFS_AGB_TO_FSB(cur->bc_mp, 98150f02fe3SDave Chinner cur->bc_ag.pag->pag_agno, 98231727258SDarrick J. Wong tmp.rc_startblock); 983c201d9caSDarrick J. Wong xfs_free_extent_later(cur->bc_tp, fsbno, 984c04c51c5SDarrick J. Wong tmp.rc_blockcount, NULL); 98531727258SDarrick J. Wong } 98631727258SDarrick J. Wong 98731727258SDarrick J. Wong (*agbno) += tmp.rc_blockcount; 98831727258SDarrick J. Wong (*aglen) -= tmp.rc_blockcount; 98931727258SDarrick J. Wong 99031727258SDarrick J. Wong error = xfs_refcount_lookup_ge(cur, *agbno, 99131727258SDarrick J. Wong &found_rec); 99231727258SDarrick J. Wong if (error) 99331727258SDarrick J. Wong goto out_error; 99431727258SDarrick J. Wong } 99531727258SDarrick J. Wong 99631727258SDarrick J. Wong /* Stop if there's nothing left to modify */ 99731727258SDarrick J. Wong if (*aglen == 0 || !xfs_refcount_still_have_space(cur)) 99831727258SDarrick J. Wong break; 99931727258SDarrick J. Wong 100031727258SDarrick J. Wong /* 100131727258SDarrick J. Wong * Adjust the reference count and either update the tree 100231727258SDarrick J. Wong * (incr) or free the blocks (decr). 100331727258SDarrick J. Wong */ 100431727258SDarrick J. Wong if (ext.rc_refcount == MAXREFCOUNT) 100531727258SDarrick J. Wong goto skip; 100631727258SDarrick J. Wong ext.rc_refcount += adj; 100731727258SDarrick J. Wong trace_xfs_refcount_modify_extent(cur->bc_mp, 100850f02fe3SDave Chinner cur->bc_ag.pag->pag_agno, &ext); 1009c47260d4SDarrick J. Wong cur->bc_ag.refc.nr_ops++; 101031727258SDarrick J. Wong if (ext.rc_refcount > 1) { 101131727258SDarrick J. Wong error = xfs_refcount_update(cur, &ext); 101231727258SDarrick J. Wong if (error) 101331727258SDarrick J. Wong goto out_error; 101431727258SDarrick J. Wong } else if (ext.rc_refcount == 1) { 101531727258SDarrick J. Wong error = xfs_refcount_delete(cur, &found_rec); 101631727258SDarrick J. Wong if (error) 101731727258SDarrick J. Wong goto out_error; 1018f9e03706SDarrick J. Wong if (XFS_IS_CORRUPT(cur->bc_mp, found_rec != 1)) { 1019f9e03706SDarrick J. Wong error = -EFSCORRUPTED; 1020f9e03706SDarrick J. Wong goto out_error; 1021f9e03706SDarrick J. Wong } 102231727258SDarrick J. Wong goto advloop; 102331727258SDarrick J. Wong } else { 102431727258SDarrick J. Wong fsbno = XFS_AGB_TO_FSB(cur->bc_mp, 102550f02fe3SDave Chinner cur->bc_ag.pag->pag_agno, 102631727258SDarrick J. Wong ext.rc_startblock); 1027c04c51c5SDarrick J. Wong xfs_free_extent_later(cur->bc_tp, fsbno, 1028c04c51c5SDarrick J. Wong ext.rc_blockcount, NULL); 102931727258SDarrick J. Wong } 103031727258SDarrick J. Wong 103131727258SDarrick J. Wong skip: 103231727258SDarrick J. Wong error = xfs_btree_increment(cur, 0, &found_rec); 103331727258SDarrick J. Wong if (error) 103431727258SDarrick J. Wong goto out_error; 103531727258SDarrick J. Wong 103631727258SDarrick J. Wong advloop: 103731727258SDarrick J. Wong (*agbno) += ext.rc_blockcount; 103831727258SDarrick J. Wong (*aglen) -= ext.rc_blockcount; 103931727258SDarrick J. Wong } 104031727258SDarrick J. Wong 104131727258SDarrick J. Wong return error; 104231727258SDarrick J. Wong out_error: 104331727258SDarrick J. Wong trace_xfs_refcount_modify_extent_error(cur->bc_mp, 104450f02fe3SDave Chinner cur->bc_ag.pag->pag_agno, error, _RET_IP_); 104531727258SDarrick J. Wong return error; 104631727258SDarrick J. Wong } 104731727258SDarrick J. Wong 104831727258SDarrick J. Wong /* Adjust the reference count of a range of AG blocks. */ 104931727258SDarrick J. Wong STATIC int 105031727258SDarrick J. Wong xfs_refcount_adjust( 105131727258SDarrick J. Wong struct xfs_btree_cur *cur, 105231727258SDarrick J. Wong xfs_agblock_t agbno, 105331727258SDarrick J. Wong xfs_extlen_t aglen, 105431727258SDarrick J. Wong xfs_agblock_t *new_agbno, 105531727258SDarrick J. Wong xfs_extlen_t *new_aglen, 1056c04c51c5SDarrick J. Wong enum xfs_refc_adjust_op adj) 105731727258SDarrick J. Wong { 105831727258SDarrick J. Wong bool shape_changed; 105931727258SDarrick J. Wong int shape_changes = 0; 106031727258SDarrick J. Wong int error; 106131727258SDarrick J. Wong 106231727258SDarrick J. Wong *new_agbno = agbno; 106331727258SDarrick J. Wong *new_aglen = aglen; 106431727258SDarrick J. Wong if (adj == XFS_REFCOUNT_ADJUST_INCREASE) 106550f02fe3SDave Chinner trace_xfs_refcount_increase(cur->bc_mp, cur->bc_ag.pag->pag_agno, 106631727258SDarrick J. Wong agbno, aglen); 106731727258SDarrick J. Wong else 106850f02fe3SDave Chinner trace_xfs_refcount_decrease(cur->bc_mp, cur->bc_ag.pag->pag_agno, 106931727258SDarrick J. Wong agbno, aglen); 107031727258SDarrick J. Wong 107131727258SDarrick J. Wong /* 107231727258SDarrick J. Wong * Ensure that no rcextents cross the boundary of the adjustment range. 107331727258SDarrick J. Wong */ 107431727258SDarrick J. Wong error = xfs_refcount_split_extent(cur, agbno, &shape_changed); 107531727258SDarrick J. Wong if (error) 107631727258SDarrick J. Wong goto out_error; 107731727258SDarrick J. Wong if (shape_changed) 107831727258SDarrick J. Wong shape_changes++; 107931727258SDarrick J. Wong 108031727258SDarrick J. Wong error = xfs_refcount_split_extent(cur, agbno + aglen, &shape_changed); 108131727258SDarrick J. Wong if (error) 108231727258SDarrick J. Wong goto out_error; 108331727258SDarrick J. Wong if (shape_changed) 108431727258SDarrick J. Wong shape_changes++; 108531727258SDarrick J. Wong 108631727258SDarrick J. Wong /* 108731727258SDarrick J. Wong * Try to merge with the left or right extents of the range. 108831727258SDarrick J. Wong */ 108931727258SDarrick J. Wong error = xfs_refcount_merge_extents(cur, new_agbno, new_aglen, adj, 1090174edb0eSDarrick J. Wong XFS_FIND_RCEXT_SHARED, &shape_changed); 109131727258SDarrick J. Wong if (error) 109231727258SDarrick J. Wong goto out_error; 109331727258SDarrick J. Wong if (shape_changed) 109431727258SDarrick J. Wong shape_changes++; 109531727258SDarrick J. Wong if (shape_changes) 1096c4aa10d0SDave Chinner cur->bc_ag.refc.shape_changes++; 109731727258SDarrick J. Wong 109831727258SDarrick J. Wong /* Now that we've taken care of the ends, adjust the middle extents */ 1099c04c51c5SDarrick J. Wong error = xfs_refcount_adjust_extents(cur, new_agbno, new_aglen, adj); 110031727258SDarrick J. Wong if (error) 110131727258SDarrick J. Wong goto out_error; 110231727258SDarrick J. Wong 110331727258SDarrick J. Wong return 0; 110431727258SDarrick J. Wong 110531727258SDarrick J. Wong out_error: 110650f02fe3SDave Chinner trace_xfs_refcount_adjust_error(cur->bc_mp, cur->bc_ag.pag->pag_agno, 110731727258SDarrick J. Wong error, _RET_IP_); 110831727258SDarrick J. Wong return error; 110931727258SDarrick J. Wong } 111033ba6129SDarrick J. Wong 111133ba6129SDarrick J. Wong /* Clean up after calling xfs_refcount_finish_one. */ 111233ba6129SDarrick J. Wong void 111333ba6129SDarrick J. Wong xfs_refcount_finish_one_cleanup( 111433ba6129SDarrick J. Wong struct xfs_trans *tp, 111533ba6129SDarrick J. Wong struct xfs_btree_cur *rcur, 111633ba6129SDarrick J. Wong int error) 111733ba6129SDarrick J. Wong { 111833ba6129SDarrick J. Wong struct xfs_buf *agbp; 111933ba6129SDarrick J. Wong 112033ba6129SDarrick J. Wong if (rcur == NULL) 112133ba6129SDarrick J. Wong return; 1122576af732SDave Chinner agbp = rcur->bc_ag.agbp; 11230b04b6b8SDarrick J. Wong xfs_btree_del_cursor(rcur, error); 112433ba6129SDarrick J. Wong if (error) 112533ba6129SDarrick J. Wong xfs_trans_brelse(tp, agbp); 112633ba6129SDarrick J. Wong } 112733ba6129SDarrick J. Wong 112833ba6129SDarrick J. Wong /* 112933ba6129SDarrick J. Wong * Process one of the deferred refcount operations. We pass back the 113033ba6129SDarrick J. Wong * btree cursor to maintain our lock on the btree between calls. 113133ba6129SDarrick J. Wong * This saves time and eliminates a buffer deadlock between the 113233ba6129SDarrick J. Wong * superblock and the AGF because we'll always grab them in the same 113333ba6129SDarrick J. Wong * order. 113433ba6129SDarrick J. Wong */ 113533ba6129SDarrick J. Wong int 113633ba6129SDarrick J. Wong xfs_refcount_finish_one( 113733ba6129SDarrick J. Wong struct xfs_trans *tp, 113833ba6129SDarrick J. Wong enum xfs_refcount_intent_type type, 113933ba6129SDarrick J. Wong xfs_fsblock_t startblock, 114033ba6129SDarrick J. Wong xfs_extlen_t blockcount, 114133ba6129SDarrick J. Wong xfs_fsblock_t *new_fsb, 114233ba6129SDarrick J. Wong xfs_extlen_t *new_len, 114333ba6129SDarrick J. Wong struct xfs_btree_cur **pcur) 114433ba6129SDarrick J. Wong { 114533ba6129SDarrick J. Wong struct xfs_mount *mp = tp->t_mountp; 114633ba6129SDarrick J. Wong struct xfs_btree_cur *rcur; 114733ba6129SDarrick J. Wong struct xfs_buf *agbp = NULL; 114833ba6129SDarrick J. Wong int error = 0; 114933ba6129SDarrick J. Wong xfs_agblock_t bno; 115033ba6129SDarrick J. Wong xfs_agblock_t new_agbno; 115133ba6129SDarrick J. Wong unsigned long nr_ops = 0; 115233ba6129SDarrick J. Wong int shape_changes = 0; 1153a81a0621SDave Chinner struct xfs_perag *pag; 115433ba6129SDarrick J. Wong 1155a81a0621SDave Chinner pag = xfs_perag_get(mp, XFS_FSB_TO_AGNO(mp, startblock)); 115633ba6129SDarrick J. Wong bno = XFS_FSB_TO_AGBNO(mp, startblock); 115733ba6129SDarrick J. Wong 115833ba6129SDarrick J. Wong trace_xfs_refcount_deferred(mp, XFS_FSB_TO_AGNO(mp, startblock), 115933ba6129SDarrick J. Wong type, XFS_FSB_TO_AGBNO(mp, startblock), 116033ba6129SDarrick J. Wong blockcount); 116133ba6129SDarrick J. Wong 1162a81a0621SDave Chinner if (XFS_TEST_ERROR(false, mp, XFS_ERRTAG_REFCOUNT_FINISH_ONE)) { 1163a81a0621SDave Chinner error = -EIO; 1164a81a0621SDave Chinner goto out_drop; 1165a81a0621SDave Chinner } 116633ba6129SDarrick J. Wong 116733ba6129SDarrick J. Wong /* 116833ba6129SDarrick J. Wong * If we haven't gotten a cursor or the cursor AG doesn't match 116933ba6129SDarrick J. Wong * the startblock, get one now. 117033ba6129SDarrick J. Wong */ 117133ba6129SDarrick J. Wong rcur = *pcur; 1172a81a0621SDave Chinner if (rcur != NULL && rcur->bc_ag.pag != pag) { 1173c4aa10d0SDave Chinner nr_ops = rcur->bc_ag.refc.nr_ops; 1174c4aa10d0SDave Chinner shape_changes = rcur->bc_ag.refc.shape_changes; 117533ba6129SDarrick J. Wong xfs_refcount_finish_one_cleanup(tp, rcur, 0); 117633ba6129SDarrick J. Wong rcur = NULL; 117733ba6129SDarrick J. Wong *pcur = NULL; 117833ba6129SDarrick J. Wong } 117933ba6129SDarrick J. Wong if (rcur == NULL) { 1180*08d3e84fSDave Chinner error = xfs_alloc_read_agf(pag, tp, XFS_ALLOC_FLAG_FREEING, 1181*08d3e84fSDave Chinner &agbp); 118233ba6129SDarrick J. Wong if (error) 1183a81a0621SDave Chinner goto out_drop; 118433ba6129SDarrick J. Wong 1185a81a0621SDave Chinner rcur = xfs_refcountbt_init_cursor(mp, tp, agbp, pag); 1186c4aa10d0SDave Chinner rcur->bc_ag.refc.nr_ops = nr_ops; 1187c4aa10d0SDave Chinner rcur->bc_ag.refc.shape_changes = shape_changes; 118833ba6129SDarrick J. Wong } 118933ba6129SDarrick J. Wong *pcur = rcur; 119033ba6129SDarrick J. Wong 119133ba6129SDarrick J. Wong switch (type) { 119233ba6129SDarrick J. Wong case XFS_REFCOUNT_INCREASE: 119333ba6129SDarrick J. Wong error = xfs_refcount_adjust(rcur, bno, blockcount, &new_agbno, 1194c04c51c5SDarrick J. Wong new_len, XFS_REFCOUNT_ADJUST_INCREASE); 1195a81a0621SDave Chinner *new_fsb = XFS_AGB_TO_FSB(mp, pag->pag_agno, new_agbno); 119633ba6129SDarrick J. Wong break; 119733ba6129SDarrick J. Wong case XFS_REFCOUNT_DECREASE: 119833ba6129SDarrick J. Wong error = xfs_refcount_adjust(rcur, bno, blockcount, &new_agbno, 1199c04c51c5SDarrick J. Wong new_len, XFS_REFCOUNT_ADJUST_DECREASE); 1200a81a0621SDave Chinner *new_fsb = XFS_AGB_TO_FSB(mp, pag->pag_agno, new_agbno); 120133ba6129SDarrick J. Wong break; 1202174edb0eSDarrick J. Wong case XFS_REFCOUNT_ALLOC_COW: 1203174edb0eSDarrick J. Wong *new_fsb = startblock + blockcount; 1204174edb0eSDarrick J. Wong *new_len = 0; 12050f37d178SBrian Foster error = __xfs_refcount_cow_alloc(rcur, bno, blockcount); 1206174edb0eSDarrick J. Wong break; 1207174edb0eSDarrick J. Wong case XFS_REFCOUNT_FREE_COW: 1208174edb0eSDarrick J. Wong *new_fsb = startblock + blockcount; 1209174edb0eSDarrick J. Wong *new_len = 0; 12100f37d178SBrian Foster error = __xfs_refcount_cow_free(rcur, bno, blockcount); 1211174edb0eSDarrick J. Wong break; 121233ba6129SDarrick J. Wong default: 121333ba6129SDarrick J. Wong ASSERT(0); 121433ba6129SDarrick J. Wong error = -EFSCORRUPTED; 121533ba6129SDarrick J. Wong } 121633ba6129SDarrick J. Wong if (!error && *new_len > 0) 1217a81a0621SDave Chinner trace_xfs_refcount_finish_one_leftover(mp, pag->pag_agno, type, 121833ba6129SDarrick J. Wong bno, blockcount, new_agbno, *new_len); 1219a81a0621SDave Chinner out_drop: 1220a81a0621SDave Chinner xfs_perag_put(pag); 122133ba6129SDarrick J. Wong return error; 122233ba6129SDarrick J. Wong } 122333ba6129SDarrick J. Wong 122433ba6129SDarrick J. Wong /* 122533ba6129SDarrick J. Wong * Record a refcount intent for later processing. 122633ba6129SDarrick J. Wong */ 122774b4c5d4SDarrick J. Wong static void 122833ba6129SDarrick J. Wong __xfs_refcount_add( 12290f37d178SBrian Foster struct xfs_trans *tp, 123033ba6129SDarrick J. Wong enum xfs_refcount_intent_type type, 123133ba6129SDarrick J. Wong xfs_fsblock_t startblock, 123233ba6129SDarrick J. Wong xfs_extlen_t blockcount) 123333ba6129SDarrick J. Wong { 123433ba6129SDarrick J. Wong struct xfs_refcount_intent *ri; 123533ba6129SDarrick J. Wong 12360f37d178SBrian Foster trace_xfs_refcount_defer(tp->t_mountp, 12370f37d178SBrian Foster XFS_FSB_TO_AGNO(tp->t_mountp, startblock), 12380f37d178SBrian Foster type, XFS_FSB_TO_AGBNO(tp->t_mountp, startblock), 123933ba6129SDarrick J. Wong blockcount); 124033ba6129SDarrick J. Wong 1241f3c799c2SDarrick J. Wong ri = kmem_cache_alloc(xfs_refcount_intent_cache, 1242f3c799c2SDarrick J. Wong GFP_NOFS | __GFP_NOFAIL); 124333ba6129SDarrick J. Wong INIT_LIST_HEAD(&ri->ri_list); 124433ba6129SDarrick J. Wong ri->ri_type = type; 124533ba6129SDarrick J. Wong ri->ri_startblock = startblock; 124633ba6129SDarrick J. Wong ri->ri_blockcount = blockcount; 124733ba6129SDarrick J. Wong 12480f37d178SBrian Foster xfs_defer_add(tp, XFS_DEFER_OPS_TYPE_REFCOUNT, &ri->ri_list); 124933ba6129SDarrick J. Wong } 125033ba6129SDarrick J. Wong 125133ba6129SDarrick J. Wong /* 125233ba6129SDarrick J. Wong * Increase the reference count of the blocks backing a file's extent. 125333ba6129SDarrick J. Wong */ 125474b4c5d4SDarrick J. Wong void 125533ba6129SDarrick J. Wong xfs_refcount_increase_extent( 12560f37d178SBrian Foster struct xfs_trans *tp, 125733ba6129SDarrick J. Wong struct xfs_bmbt_irec *PREV) 125833ba6129SDarrick J. Wong { 1259ebd9027dSDave Chinner if (!xfs_has_reflink(tp->t_mountp)) 126074b4c5d4SDarrick J. Wong return; 126133ba6129SDarrick J. Wong 126274b4c5d4SDarrick J. Wong __xfs_refcount_add(tp, XFS_REFCOUNT_INCREASE, PREV->br_startblock, 126374b4c5d4SDarrick J. Wong PREV->br_blockcount); 126433ba6129SDarrick J. Wong } 126533ba6129SDarrick J. Wong 126633ba6129SDarrick J. Wong /* 126733ba6129SDarrick J. Wong * Decrease the reference count of the blocks backing a file's extent. 126833ba6129SDarrick J. Wong */ 126974b4c5d4SDarrick J. Wong void 127033ba6129SDarrick J. Wong xfs_refcount_decrease_extent( 12710f37d178SBrian Foster struct xfs_trans *tp, 127233ba6129SDarrick J. Wong struct xfs_bmbt_irec *PREV) 127333ba6129SDarrick J. Wong { 1274ebd9027dSDave Chinner if (!xfs_has_reflink(tp->t_mountp)) 127574b4c5d4SDarrick J. Wong return; 127633ba6129SDarrick J. Wong 127774b4c5d4SDarrick J. Wong __xfs_refcount_add(tp, XFS_REFCOUNT_DECREASE, PREV->br_startblock, 127874b4c5d4SDarrick J. Wong PREV->br_blockcount); 127933ba6129SDarrick J. Wong } 1280350a27a6SDarrick J. Wong 1281350a27a6SDarrick J. Wong /* 1282350a27a6SDarrick J. Wong * Given an AG extent, find the lowest-numbered run of shared blocks 1283350a27a6SDarrick J. Wong * within that range and return the range in fbno/flen. If 1284350a27a6SDarrick J. Wong * find_end_of_shared is set, return the longest contiguous extent of 1285350a27a6SDarrick J. Wong * shared blocks; if not, just return the first extent we find. If no 1286350a27a6SDarrick J. Wong * shared blocks are found, fbno and flen will be set to NULLAGBLOCK 1287350a27a6SDarrick J. Wong * and 0, respectively. 1288350a27a6SDarrick J. Wong */ 1289350a27a6SDarrick J. Wong int 1290350a27a6SDarrick J. Wong xfs_refcount_find_shared( 1291350a27a6SDarrick J. Wong struct xfs_btree_cur *cur, 1292350a27a6SDarrick J. Wong xfs_agblock_t agbno, 1293350a27a6SDarrick J. Wong xfs_extlen_t aglen, 1294350a27a6SDarrick J. Wong xfs_agblock_t *fbno, 1295350a27a6SDarrick J. Wong xfs_extlen_t *flen, 1296350a27a6SDarrick J. Wong bool find_end_of_shared) 1297350a27a6SDarrick J. Wong { 1298350a27a6SDarrick J. Wong struct xfs_refcount_irec tmp; 1299350a27a6SDarrick J. Wong int i; 1300350a27a6SDarrick J. Wong int have; 1301350a27a6SDarrick J. Wong int error; 1302350a27a6SDarrick J. Wong 130350f02fe3SDave Chinner trace_xfs_refcount_find_shared(cur->bc_mp, cur->bc_ag.pag->pag_agno, 1304350a27a6SDarrick J. Wong agbno, aglen); 1305350a27a6SDarrick J. Wong 1306350a27a6SDarrick J. Wong /* By default, skip the whole range */ 1307350a27a6SDarrick J. Wong *fbno = NULLAGBLOCK; 1308350a27a6SDarrick J. Wong *flen = 0; 1309350a27a6SDarrick J. Wong 1310350a27a6SDarrick J. Wong /* Try to find a refcount extent that crosses the start */ 1311350a27a6SDarrick J. Wong error = xfs_refcount_lookup_le(cur, agbno, &have); 1312350a27a6SDarrick J. Wong if (error) 1313350a27a6SDarrick J. Wong goto out_error; 1314350a27a6SDarrick J. Wong if (!have) { 1315350a27a6SDarrick J. Wong /* No left extent, look at the next one */ 1316350a27a6SDarrick J. Wong error = xfs_btree_increment(cur, 0, &have); 1317350a27a6SDarrick J. Wong if (error) 1318350a27a6SDarrick J. Wong goto out_error; 1319350a27a6SDarrick J. Wong if (!have) 1320350a27a6SDarrick J. Wong goto done; 1321350a27a6SDarrick J. Wong } 1322350a27a6SDarrick J. Wong error = xfs_refcount_get_rec(cur, &tmp, &i); 1323350a27a6SDarrick J. Wong if (error) 1324350a27a6SDarrick J. Wong goto out_error; 1325f9e03706SDarrick J. Wong if (XFS_IS_CORRUPT(cur->bc_mp, i != 1)) { 1326f9e03706SDarrick J. Wong error = -EFSCORRUPTED; 1327f9e03706SDarrick J. Wong goto out_error; 1328f9e03706SDarrick J. Wong } 1329350a27a6SDarrick J. Wong 1330350a27a6SDarrick J. Wong /* If the extent ends before the start, look at the next one */ 1331350a27a6SDarrick J. Wong if (tmp.rc_startblock + tmp.rc_blockcount <= agbno) { 1332350a27a6SDarrick J. Wong error = xfs_btree_increment(cur, 0, &have); 1333350a27a6SDarrick J. Wong if (error) 1334350a27a6SDarrick J. Wong goto out_error; 1335350a27a6SDarrick J. Wong if (!have) 1336350a27a6SDarrick J. Wong goto done; 1337350a27a6SDarrick J. Wong error = xfs_refcount_get_rec(cur, &tmp, &i); 1338350a27a6SDarrick J. Wong if (error) 1339350a27a6SDarrick J. Wong goto out_error; 1340f9e03706SDarrick J. Wong if (XFS_IS_CORRUPT(cur->bc_mp, i != 1)) { 1341f9e03706SDarrick J. Wong error = -EFSCORRUPTED; 1342f9e03706SDarrick J. Wong goto out_error; 1343f9e03706SDarrick J. Wong } 1344350a27a6SDarrick J. Wong } 1345350a27a6SDarrick J. Wong 1346350a27a6SDarrick J. Wong /* If the extent starts after the range we want, bail out */ 1347350a27a6SDarrick J. Wong if (tmp.rc_startblock >= agbno + aglen) 1348350a27a6SDarrick J. Wong goto done; 1349350a27a6SDarrick J. Wong 1350350a27a6SDarrick J. Wong /* We found the start of a shared extent! */ 1351350a27a6SDarrick J. Wong if (tmp.rc_startblock < agbno) { 1352350a27a6SDarrick J. Wong tmp.rc_blockcount -= (agbno - tmp.rc_startblock); 1353350a27a6SDarrick J. Wong tmp.rc_startblock = agbno; 1354350a27a6SDarrick J. Wong } 1355350a27a6SDarrick J. Wong 1356350a27a6SDarrick J. Wong *fbno = tmp.rc_startblock; 1357350a27a6SDarrick J. Wong *flen = min(tmp.rc_blockcount, agbno + aglen - *fbno); 1358350a27a6SDarrick J. Wong if (!find_end_of_shared) 1359350a27a6SDarrick J. Wong goto done; 1360350a27a6SDarrick J. Wong 1361350a27a6SDarrick J. Wong /* Otherwise, find the end of this shared extent */ 1362350a27a6SDarrick J. Wong while (*fbno + *flen < agbno + aglen) { 1363350a27a6SDarrick J. Wong error = xfs_btree_increment(cur, 0, &have); 1364350a27a6SDarrick J. Wong if (error) 1365350a27a6SDarrick J. Wong goto out_error; 1366350a27a6SDarrick J. Wong if (!have) 1367350a27a6SDarrick J. Wong break; 1368350a27a6SDarrick J. Wong error = xfs_refcount_get_rec(cur, &tmp, &i); 1369350a27a6SDarrick J. Wong if (error) 1370350a27a6SDarrick J. Wong goto out_error; 1371f9e03706SDarrick J. Wong if (XFS_IS_CORRUPT(cur->bc_mp, i != 1)) { 1372f9e03706SDarrick J. Wong error = -EFSCORRUPTED; 1373f9e03706SDarrick J. Wong goto out_error; 1374f9e03706SDarrick J. Wong } 1375350a27a6SDarrick J. Wong if (tmp.rc_startblock >= agbno + aglen || 1376350a27a6SDarrick J. Wong tmp.rc_startblock != *fbno + *flen) 1377350a27a6SDarrick J. Wong break; 1378350a27a6SDarrick J. Wong *flen = min(*flen + tmp.rc_blockcount, agbno + aglen - *fbno); 1379350a27a6SDarrick J. Wong } 1380350a27a6SDarrick J. Wong 1381350a27a6SDarrick J. Wong done: 1382350a27a6SDarrick J. Wong trace_xfs_refcount_find_shared_result(cur->bc_mp, 138350f02fe3SDave Chinner cur->bc_ag.pag->pag_agno, *fbno, *flen); 1384350a27a6SDarrick J. Wong 1385350a27a6SDarrick J. Wong out_error: 1386350a27a6SDarrick J. Wong if (error) 1387350a27a6SDarrick J. Wong trace_xfs_refcount_find_shared_error(cur->bc_mp, 138850f02fe3SDave Chinner cur->bc_ag.pag->pag_agno, error, _RET_IP_); 1389350a27a6SDarrick J. Wong return error; 1390350a27a6SDarrick J. Wong } 1391174edb0eSDarrick J. Wong 1392174edb0eSDarrick J. Wong /* 1393174edb0eSDarrick J. Wong * Recovering CoW Blocks After a Crash 1394174edb0eSDarrick J. Wong * 1395174edb0eSDarrick J. Wong * Due to the way that the copy on write mechanism works, there's a window of 1396174edb0eSDarrick J. Wong * opportunity in which we can lose track of allocated blocks during a crash. 1397174edb0eSDarrick J. Wong * Because CoW uses delayed allocation in the in-core CoW fork, writeback 1398174edb0eSDarrick J. Wong * causes blocks to be allocated and stored in the CoW fork. The blocks are 1399174edb0eSDarrick J. Wong * no longer in the free space btree but are not otherwise recorded anywhere 1400174edb0eSDarrick J. Wong * until the write completes and the blocks are mapped into the file. A crash 1401174edb0eSDarrick J. Wong * in between allocation and remapping results in the replacement blocks being 1402174edb0eSDarrick J. Wong * lost. This situation is exacerbated by the CoW extent size hint because 1403174edb0eSDarrick J. Wong * allocations can hang around for long time. 1404174edb0eSDarrick J. Wong * 1405174edb0eSDarrick J. Wong * However, there is a place where we can record these allocations before they 1406174edb0eSDarrick J. Wong * become mappings -- the reference count btree. The btree does not record 1407174edb0eSDarrick J. Wong * extents with refcount == 1, so we can record allocations with a refcount of 1408174edb0eSDarrick J. Wong * 1. Blocks being used for CoW writeout cannot be shared, so there should be 1409174edb0eSDarrick J. Wong * no conflict with shared block records. These mappings should be created 1410174edb0eSDarrick J. Wong * when we allocate blocks to the CoW fork and deleted when they're removed 1411174edb0eSDarrick J. Wong * from the CoW fork. 1412174edb0eSDarrick J. Wong * 1413174edb0eSDarrick J. Wong * Minor nit: records for in-progress CoW allocations and records for shared 1414174edb0eSDarrick J. Wong * extents must never be merged, to preserve the property that (except for CoW 1415174edb0eSDarrick J. Wong * allocations) there are no refcount btree entries with refcount == 1. The 1416174edb0eSDarrick J. Wong * only time this could potentially happen is when unsharing a block that's 1417174edb0eSDarrick J. Wong * adjacent to CoW allocations, so we must be careful to avoid this. 1418174edb0eSDarrick J. Wong * 1419174edb0eSDarrick J. Wong * At mount time we recover lost CoW allocations by searching the refcount 1420174edb0eSDarrick J. Wong * btree for these refcount == 1 mappings. These represent CoW allocations 1421174edb0eSDarrick J. Wong * that were in progress at the time the filesystem went down, so we can free 1422174edb0eSDarrick J. Wong * them to get the space back. 1423174edb0eSDarrick J. Wong * 1424174edb0eSDarrick J. Wong * This mechanism is superior to creating EFIs for unmapped CoW extents for 1425174edb0eSDarrick J. Wong * several reasons -- first, EFIs pin the tail of the log and would have to be 1426174edb0eSDarrick J. Wong * periodically relogged to avoid filling up the log. Second, CoW completions 1427174edb0eSDarrick J. Wong * will have to file an EFD and create new EFIs for whatever remains in the 1428174edb0eSDarrick J. Wong * CoW fork; this partially takes care of (1) but extent-size reservations 1429174edb0eSDarrick J. Wong * will have to periodically relog even if there's no writeout in progress. 1430174edb0eSDarrick J. Wong * This can happen if the CoW extent size hint is set, which you really want. 1431174edb0eSDarrick J. Wong * Third, EFIs cannot currently be automatically relogged into newer 1432174edb0eSDarrick J. Wong * transactions to advance the log tail. Fourth, stuffing the log full of 1433174edb0eSDarrick J. Wong * EFIs places an upper bound on the number of CoW allocations that can be 1434174edb0eSDarrick J. Wong * held filesystem-wide at any given time. Recording them in the refcount 1435174edb0eSDarrick J. Wong * btree doesn't require us to maintain any state in memory and doesn't pin 1436174edb0eSDarrick J. Wong * the log. 1437174edb0eSDarrick J. Wong */ 1438174edb0eSDarrick J. Wong /* 1439174edb0eSDarrick J. Wong * Adjust the refcounts of CoW allocations. These allocations are "magic" 1440174edb0eSDarrick J. Wong * in that they're not referenced anywhere else in the filesystem, so we 1441174edb0eSDarrick J. Wong * stash them in the refcount btree with a refcount of 1 until either file 1442174edb0eSDarrick J. Wong * remapping (or CoW cancellation) happens. 1443174edb0eSDarrick J. Wong */ 1444174edb0eSDarrick J. Wong STATIC int 1445174edb0eSDarrick J. Wong xfs_refcount_adjust_cow_extents( 1446174edb0eSDarrick J. Wong struct xfs_btree_cur *cur, 1447174edb0eSDarrick J. Wong xfs_agblock_t agbno, 1448174edb0eSDarrick J. Wong xfs_extlen_t aglen, 1449a1f69417SEric Sandeen enum xfs_refc_adjust_op adj) 1450174edb0eSDarrick J. Wong { 1451174edb0eSDarrick J. Wong struct xfs_refcount_irec ext, tmp; 1452174edb0eSDarrick J. Wong int error; 1453174edb0eSDarrick J. Wong int found_rec, found_tmp; 1454174edb0eSDarrick J. Wong 1455174edb0eSDarrick J. Wong if (aglen == 0) 1456174edb0eSDarrick J. Wong return 0; 1457174edb0eSDarrick J. Wong 1458174edb0eSDarrick J. Wong /* Find any overlapping refcount records */ 1459174edb0eSDarrick J. Wong error = xfs_refcount_lookup_ge(cur, agbno, &found_rec); 1460174edb0eSDarrick J. Wong if (error) 1461174edb0eSDarrick J. Wong goto out_error; 1462174edb0eSDarrick J. Wong error = xfs_refcount_get_rec(cur, &ext, &found_rec); 1463174edb0eSDarrick J. Wong if (error) 1464174edb0eSDarrick J. Wong goto out_error; 1465174edb0eSDarrick J. Wong if (!found_rec) { 1466174edb0eSDarrick J. Wong ext.rc_startblock = cur->bc_mp->m_sb.sb_agblocks + 1467174edb0eSDarrick J. Wong XFS_REFC_COW_START; 1468174edb0eSDarrick J. Wong ext.rc_blockcount = 0; 1469174edb0eSDarrick J. Wong ext.rc_refcount = 0; 1470174edb0eSDarrick J. Wong } 1471174edb0eSDarrick J. Wong 1472174edb0eSDarrick J. Wong switch (adj) { 1473174edb0eSDarrick J. Wong case XFS_REFCOUNT_ADJUST_COW_ALLOC: 1474174edb0eSDarrick J. Wong /* Adding a CoW reservation, there should be nothing here. */ 1475f9e03706SDarrick J. Wong if (XFS_IS_CORRUPT(cur->bc_mp, 1476f9e03706SDarrick J. Wong agbno + aglen > ext.rc_startblock)) { 1477f9e03706SDarrick J. Wong error = -EFSCORRUPTED; 1478f9e03706SDarrick J. Wong goto out_error; 1479f9e03706SDarrick J. Wong } 1480174edb0eSDarrick J. Wong 1481174edb0eSDarrick J. Wong tmp.rc_startblock = agbno; 1482174edb0eSDarrick J. Wong tmp.rc_blockcount = aglen; 1483174edb0eSDarrick J. Wong tmp.rc_refcount = 1; 1484174edb0eSDarrick J. Wong trace_xfs_refcount_modify_extent(cur->bc_mp, 148550f02fe3SDave Chinner cur->bc_ag.pag->pag_agno, &tmp); 1486174edb0eSDarrick J. Wong 1487174edb0eSDarrick J. Wong error = xfs_refcount_insert(cur, &tmp, 1488174edb0eSDarrick J. Wong &found_tmp); 1489174edb0eSDarrick J. Wong if (error) 1490174edb0eSDarrick J. Wong goto out_error; 1491f9e03706SDarrick J. Wong if (XFS_IS_CORRUPT(cur->bc_mp, found_tmp != 1)) { 1492f9e03706SDarrick J. Wong error = -EFSCORRUPTED; 1493f9e03706SDarrick J. Wong goto out_error; 1494f9e03706SDarrick J. Wong } 1495174edb0eSDarrick J. Wong break; 1496174edb0eSDarrick J. Wong case XFS_REFCOUNT_ADJUST_COW_FREE: 1497174edb0eSDarrick J. Wong /* Removing a CoW reservation, there should be one extent. */ 1498f9e03706SDarrick J. Wong if (XFS_IS_CORRUPT(cur->bc_mp, ext.rc_startblock != agbno)) { 1499f9e03706SDarrick J. Wong error = -EFSCORRUPTED; 1500f9e03706SDarrick J. Wong goto out_error; 1501f9e03706SDarrick J. Wong } 1502f9e03706SDarrick J. Wong if (XFS_IS_CORRUPT(cur->bc_mp, ext.rc_blockcount != aglen)) { 1503f9e03706SDarrick J. Wong error = -EFSCORRUPTED; 1504f9e03706SDarrick J. Wong goto out_error; 1505f9e03706SDarrick J. Wong } 1506f9e03706SDarrick J. Wong if (XFS_IS_CORRUPT(cur->bc_mp, ext.rc_refcount != 1)) { 1507f9e03706SDarrick J. Wong error = -EFSCORRUPTED; 1508f9e03706SDarrick J. Wong goto out_error; 1509f9e03706SDarrick J. Wong } 1510174edb0eSDarrick J. Wong 1511174edb0eSDarrick J. Wong ext.rc_refcount = 0; 1512174edb0eSDarrick J. Wong trace_xfs_refcount_modify_extent(cur->bc_mp, 151350f02fe3SDave Chinner cur->bc_ag.pag->pag_agno, &ext); 1514174edb0eSDarrick J. Wong error = xfs_refcount_delete(cur, &found_rec); 1515174edb0eSDarrick J. Wong if (error) 1516174edb0eSDarrick J. Wong goto out_error; 1517f9e03706SDarrick J. Wong if (XFS_IS_CORRUPT(cur->bc_mp, found_rec != 1)) { 1518f9e03706SDarrick J. Wong error = -EFSCORRUPTED; 1519f9e03706SDarrick J. Wong goto out_error; 1520f9e03706SDarrick J. Wong } 1521174edb0eSDarrick J. Wong break; 1522174edb0eSDarrick J. Wong default: 1523174edb0eSDarrick J. Wong ASSERT(0); 1524174edb0eSDarrick J. Wong } 1525174edb0eSDarrick J. Wong 1526174edb0eSDarrick J. Wong return error; 1527174edb0eSDarrick J. Wong out_error: 1528174edb0eSDarrick J. Wong trace_xfs_refcount_modify_extent_error(cur->bc_mp, 152950f02fe3SDave Chinner cur->bc_ag.pag->pag_agno, error, _RET_IP_); 1530174edb0eSDarrick J. Wong return error; 1531174edb0eSDarrick J. Wong } 1532174edb0eSDarrick J. Wong 1533174edb0eSDarrick J. Wong /* 1534174edb0eSDarrick J. Wong * Add or remove refcount btree entries for CoW reservations. 1535174edb0eSDarrick J. Wong */ 1536174edb0eSDarrick J. Wong STATIC int 1537174edb0eSDarrick J. Wong xfs_refcount_adjust_cow( 1538174edb0eSDarrick J. Wong struct xfs_btree_cur *cur, 1539174edb0eSDarrick J. Wong xfs_agblock_t agbno, 1540174edb0eSDarrick J. Wong xfs_extlen_t aglen, 1541a1f69417SEric Sandeen enum xfs_refc_adjust_op adj) 1542174edb0eSDarrick J. Wong { 1543174edb0eSDarrick J. Wong bool shape_changed; 1544174edb0eSDarrick J. Wong int error; 1545174edb0eSDarrick J. Wong 1546174edb0eSDarrick J. Wong agbno += XFS_REFC_COW_START; 1547174edb0eSDarrick J. Wong 1548174edb0eSDarrick J. Wong /* 1549174edb0eSDarrick J. Wong * Ensure that no rcextents cross the boundary of the adjustment range. 1550174edb0eSDarrick J. Wong */ 1551174edb0eSDarrick J. Wong error = xfs_refcount_split_extent(cur, agbno, &shape_changed); 1552174edb0eSDarrick J. Wong if (error) 1553174edb0eSDarrick J. Wong goto out_error; 1554174edb0eSDarrick J. Wong 1555174edb0eSDarrick J. Wong error = xfs_refcount_split_extent(cur, agbno + aglen, &shape_changed); 1556174edb0eSDarrick J. Wong if (error) 1557174edb0eSDarrick J. Wong goto out_error; 1558174edb0eSDarrick J. Wong 1559174edb0eSDarrick J. Wong /* 1560174edb0eSDarrick J. Wong * Try to merge with the left or right extents of the range. 1561174edb0eSDarrick J. Wong */ 1562174edb0eSDarrick J. Wong error = xfs_refcount_merge_extents(cur, &agbno, &aglen, adj, 1563174edb0eSDarrick J. Wong XFS_FIND_RCEXT_COW, &shape_changed); 1564174edb0eSDarrick J. Wong if (error) 1565174edb0eSDarrick J. Wong goto out_error; 1566174edb0eSDarrick J. Wong 1567174edb0eSDarrick J. Wong /* Now that we've taken care of the ends, adjust the middle extents */ 1568a1f69417SEric Sandeen error = xfs_refcount_adjust_cow_extents(cur, agbno, aglen, adj); 1569174edb0eSDarrick J. Wong if (error) 1570174edb0eSDarrick J. Wong goto out_error; 1571174edb0eSDarrick J. Wong 1572174edb0eSDarrick J. Wong return 0; 1573174edb0eSDarrick J. Wong 1574174edb0eSDarrick J. Wong out_error: 157550f02fe3SDave Chinner trace_xfs_refcount_adjust_cow_error(cur->bc_mp, cur->bc_ag.pag->pag_agno, 1576174edb0eSDarrick J. Wong error, _RET_IP_); 1577174edb0eSDarrick J. Wong return error; 1578174edb0eSDarrick J. Wong } 1579174edb0eSDarrick J. Wong 1580174edb0eSDarrick J. Wong /* 1581174edb0eSDarrick J. Wong * Record a CoW allocation in the refcount btree. 1582174edb0eSDarrick J. Wong */ 1583174edb0eSDarrick J. Wong STATIC int 1584174edb0eSDarrick J. Wong __xfs_refcount_cow_alloc( 1585174edb0eSDarrick J. Wong struct xfs_btree_cur *rcur, 1586174edb0eSDarrick J. Wong xfs_agblock_t agbno, 15870f37d178SBrian Foster xfs_extlen_t aglen) 1588174edb0eSDarrick J. Wong { 158950f02fe3SDave Chinner trace_xfs_refcount_cow_increase(rcur->bc_mp, rcur->bc_ag.pag->pag_agno, 1590174edb0eSDarrick J. Wong agbno, aglen); 1591174edb0eSDarrick J. Wong 1592174edb0eSDarrick J. Wong /* Add refcount btree reservation */ 15930525e952SDarrick J. Wong return xfs_refcount_adjust_cow(rcur, agbno, aglen, 1594a1f69417SEric Sandeen XFS_REFCOUNT_ADJUST_COW_ALLOC); 1595174edb0eSDarrick J. Wong } 1596174edb0eSDarrick J. Wong 1597174edb0eSDarrick J. Wong /* 1598174edb0eSDarrick J. Wong * Remove a CoW allocation from the refcount btree. 1599174edb0eSDarrick J. Wong */ 1600174edb0eSDarrick J. Wong STATIC int 1601174edb0eSDarrick J. Wong __xfs_refcount_cow_free( 1602174edb0eSDarrick J. Wong struct xfs_btree_cur *rcur, 1603174edb0eSDarrick J. Wong xfs_agblock_t agbno, 16040f37d178SBrian Foster xfs_extlen_t aglen) 1605174edb0eSDarrick J. Wong { 160650f02fe3SDave Chinner trace_xfs_refcount_cow_decrease(rcur->bc_mp, rcur->bc_ag.pag->pag_agno, 1607174edb0eSDarrick J. Wong agbno, aglen); 1608174edb0eSDarrick J. Wong 1609174edb0eSDarrick J. Wong /* Remove refcount btree reservation */ 16100525e952SDarrick J. Wong return xfs_refcount_adjust_cow(rcur, agbno, aglen, 1611a1f69417SEric Sandeen XFS_REFCOUNT_ADJUST_COW_FREE); 1612174edb0eSDarrick J. Wong } 1613174edb0eSDarrick J. Wong 1614174edb0eSDarrick J. Wong /* Record a CoW staging extent in the refcount btree. */ 161574b4c5d4SDarrick J. Wong void 1616174edb0eSDarrick J. Wong xfs_refcount_alloc_cow_extent( 16170f37d178SBrian Foster struct xfs_trans *tp, 1618174edb0eSDarrick J. Wong xfs_fsblock_t fsb, 1619174edb0eSDarrick J. Wong xfs_extlen_t len) 1620174edb0eSDarrick J. Wong { 16210f37d178SBrian Foster struct xfs_mount *mp = tp->t_mountp; 16220525e952SDarrick J. Wong 1623ebd9027dSDave Chinner if (!xfs_has_reflink(mp)) 162474b4c5d4SDarrick J. Wong return; 1625174edb0eSDarrick J. Wong 162674b4c5d4SDarrick J. Wong __xfs_refcount_add(tp, XFS_REFCOUNT_ALLOC_COW, fsb, len); 16270525e952SDarrick J. Wong 16280525e952SDarrick J. Wong /* Add rmap entry */ 1629bc46ac64SDarrick J. Wong xfs_rmap_alloc_extent(tp, XFS_FSB_TO_AGNO(mp, fsb), 16300525e952SDarrick J. Wong XFS_FSB_TO_AGBNO(mp, fsb), len, XFS_RMAP_OWN_COW); 1631174edb0eSDarrick J. Wong } 1632174edb0eSDarrick J. Wong 1633174edb0eSDarrick J. Wong /* Forget a CoW staging event in the refcount btree. */ 163474b4c5d4SDarrick J. Wong void 1635174edb0eSDarrick J. Wong xfs_refcount_free_cow_extent( 16360f37d178SBrian Foster struct xfs_trans *tp, 1637174edb0eSDarrick J. Wong xfs_fsblock_t fsb, 1638174edb0eSDarrick J. Wong xfs_extlen_t len) 1639174edb0eSDarrick J. Wong { 16400f37d178SBrian Foster struct xfs_mount *mp = tp->t_mountp; 16410525e952SDarrick J. Wong 1642ebd9027dSDave Chinner if (!xfs_has_reflink(mp)) 164374b4c5d4SDarrick J. Wong return; 1644174edb0eSDarrick J. Wong 16450525e952SDarrick J. Wong /* Remove rmap entry */ 1646bc46ac64SDarrick J. Wong xfs_rmap_free_extent(tp, XFS_FSB_TO_AGNO(mp, fsb), 16470525e952SDarrick J. Wong XFS_FSB_TO_AGBNO(mp, fsb), len, XFS_RMAP_OWN_COW); 164874b4c5d4SDarrick J. Wong __xfs_refcount_add(tp, XFS_REFCOUNT_FREE_COW, fsb, len); 1649174edb0eSDarrick J. Wong } 1650174edb0eSDarrick J. Wong 1651174edb0eSDarrick J. Wong struct xfs_refcount_recovery { 1652174edb0eSDarrick J. Wong struct list_head rr_list; 1653174edb0eSDarrick J. Wong struct xfs_refcount_irec rr_rrec; 1654174edb0eSDarrick J. Wong }; 1655174edb0eSDarrick J. Wong 1656174edb0eSDarrick J. Wong /* Stuff an extent on the recovery list. */ 1657174edb0eSDarrick J. Wong STATIC int 1658174edb0eSDarrick J. Wong xfs_refcount_recover_extent( 1659174edb0eSDarrick J. Wong struct xfs_btree_cur *cur, 1660159eb69dSDarrick J. Wong const union xfs_btree_rec *rec, 1661174edb0eSDarrick J. Wong void *priv) 1662174edb0eSDarrick J. Wong { 1663174edb0eSDarrick J. Wong struct list_head *debris = priv; 1664174edb0eSDarrick J. Wong struct xfs_refcount_recovery *rr; 1665174edb0eSDarrick J. Wong 1666a71895c5SDarrick J. Wong if (XFS_IS_CORRUPT(cur->bc_mp, 1667a71895c5SDarrick J. Wong be32_to_cpu(rec->refc.rc_refcount) != 1)) 1668174edb0eSDarrick J. Wong return -EFSCORRUPTED; 1669174edb0eSDarrick J. Wong 1670707e0ddaSTetsuo Handa rr = kmem_alloc(sizeof(struct xfs_refcount_recovery), 0); 1671174edb0eSDarrick J. Wong xfs_refcount_btrec_to_irec(rec, &rr->rr_rrec); 1672174edb0eSDarrick J. Wong list_add_tail(&rr->rr_list, debris); 1673174edb0eSDarrick J. Wong 1674174edb0eSDarrick J. Wong return 0; 1675174edb0eSDarrick J. Wong } 1676174edb0eSDarrick J. Wong 1677174edb0eSDarrick J. Wong /* Find and remove leftover CoW reservations. */ 1678174edb0eSDarrick J. Wong int 1679174edb0eSDarrick J. Wong xfs_refcount_recover_cow_leftovers( 1680174edb0eSDarrick J. Wong struct xfs_mount *mp, 1681a81a0621SDave Chinner struct xfs_perag *pag) 1682174edb0eSDarrick J. Wong { 1683174edb0eSDarrick J. Wong struct xfs_trans *tp; 1684174edb0eSDarrick J. Wong struct xfs_btree_cur *cur; 1685174edb0eSDarrick J. Wong struct xfs_buf *agbp; 1686174edb0eSDarrick J. Wong struct xfs_refcount_recovery *rr, *n; 1687174edb0eSDarrick J. Wong struct list_head debris; 1688174edb0eSDarrick J. Wong union xfs_btree_irec low; 1689174edb0eSDarrick J. Wong union xfs_btree_irec high; 1690174edb0eSDarrick J. Wong xfs_fsblock_t fsb; 1691174edb0eSDarrick J. Wong xfs_agblock_t agbno; 1692174edb0eSDarrick J. Wong int error; 1693174edb0eSDarrick J. Wong 1694174edb0eSDarrick J. Wong if (mp->m_sb.sb_agblocks >= XFS_REFC_COW_START) 1695174edb0eSDarrick J. Wong return -EOPNOTSUPP; 1696174edb0eSDarrick J. Wong 16973ecb3ac7SDarrick J. Wong INIT_LIST_HEAD(&debris); 16983ecb3ac7SDarrick J. Wong 16993ecb3ac7SDarrick J. Wong /* 17003ecb3ac7SDarrick J. Wong * In this first part, we use an empty transaction to gather up 17013ecb3ac7SDarrick J. Wong * all the leftover CoW extents so that we can subsequently 17023ecb3ac7SDarrick J. Wong * delete them. The empty transaction is used to avoid 17033ecb3ac7SDarrick J. Wong * a buffer lock deadlock if there happens to be a loop in the 17043ecb3ac7SDarrick J. Wong * refcountbt because we're allowed to re-grab a buffer that is 17053ecb3ac7SDarrick J. Wong * already attached to our transaction. When we're done 17063ecb3ac7SDarrick J. Wong * recording the CoW debris we cancel the (empty) transaction 17073ecb3ac7SDarrick J. Wong * and everything goes away cleanly. 17083ecb3ac7SDarrick J. Wong */ 17093ecb3ac7SDarrick J. Wong error = xfs_trans_alloc_empty(mp, &tp); 1710174edb0eSDarrick J. Wong if (error) 1711174edb0eSDarrick J. Wong return error; 17123ecb3ac7SDarrick J. Wong 1713*08d3e84fSDave Chinner error = xfs_alloc_read_agf(pag, tp, 0, &agbp); 17143ecb3ac7SDarrick J. Wong if (error) 17153ecb3ac7SDarrick J. Wong goto out_trans; 1716a81a0621SDave Chinner cur = xfs_refcountbt_init_cursor(mp, tp, agbp, pag); 1717174edb0eSDarrick J. Wong 1718174edb0eSDarrick J. Wong /* Find all the leftover CoW staging extents. */ 1719174edb0eSDarrick J. Wong memset(&low, 0, sizeof(low)); 1720174edb0eSDarrick J. Wong memset(&high, 0, sizeof(high)); 1721174edb0eSDarrick J. Wong low.rc.rc_startblock = XFS_REFC_COW_START; 1722174edb0eSDarrick J. Wong high.rc.rc_startblock = -1U; 1723174edb0eSDarrick J. Wong error = xfs_btree_query_range(cur, &low, &high, 1724174edb0eSDarrick J. Wong xfs_refcount_recover_extent, &debris); 1725ef97ef26SDarrick J. Wong xfs_btree_del_cursor(cur, error); 17263ecb3ac7SDarrick J. Wong xfs_trans_brelse(tp, agbp); 17273ecb3ac7SDarrick J. Wong xfs_trans_cancel(tp); 1728ef97ef26SDarrick J. Wong if (error) 1729ef97ef26SDarrick J. Wong goto out_free; 1730174edb0eSDarrick J. Wong 1731174edb0eSDarrick J. Wong /* Now iterate the list to free the leftovers */ 17323ecb3ac7SDarrick J. Wong list_for_each_entry_safe(rr, n, &debris, rr_list) { 1733174edb0eSDarrick J. Wong /* Set up transaction. */ 1734174edb0eSDarrick J. Wong error = xfs_trans_alloc(mp, &M_RES(mp)->tr_write, 0, 0, 0, &tp); 1735174edb0eSDarrick J. Wong if (error) 1736174edb0eSDarrick J. Wong goto out_free; 1737174edb0eSDarrick J. Wong 1738a81a0621SDave Chinner trace_xfs_refcount_recover_extent(mp, pag->pag_agno, 1739a81a0621SDave Chinner &rr->rr_rrec); 1740174edb0eSDarrick J. Wong 1741174edb0eSDarrick J. Wong /* Free the orphan record */ 1742174edb0eSDarrick J. Wong agbno = rr->rr_rrec.rc_startblock - XFS_REFC_COW_START; 1743a81a0621SDave Chinner fsb = XFS_AGB_TO_FSB(mp, pag->pag_agno, agbno); 174474b4c5d4SDarrick J. Wong xfs_refcount_free_cow_extent(tp, fsb, 1745174edb0eSDarrick J. Wong rr->rr_rrec.rc_blockcount); 1746174edb0eSDarrick J. Wong 1747174edb0eSDarrick J. Wong /* Free the block. */ 1748c201d9caSDarrick J. Wong xfs_free_extent_later(tp, fsb, rr->rr_rrec.rc_blockcount, NULL); 1749174edb0eSDarrick J. Wong 1750174edb0eSDarrick J. Wong error = xfs_trans_commit(tp); 1751174edb0eSDarrick J. Wong if (error) 1752174edb0eSDarrick J. Wong goto out_free; 17533ecb3ac7SDarrick J. Wong 17543ecb3ac7SDarrick J. Wong list_del(&rr->rr_list); 17553ecb3ac7SDarrick J. Wong kmem_free(rr); 17566f97077fSDarrick J. Wong } 1757174edb0eSDarrick J. Wong 17583ecb3ac7SDarrick J. Wong return error; 17593ecb3ac7SDarrick J. Wong out_trans: 17603ecb3ac7SDarrick J. Wong xfs_trans_cancel(tp); 1761174edb0eSDarrick J. Wong out_free: 1762174edb0eSDarrick J. Wong /* Free the leftover list */ 1763174edb0eSDarrick J. Wong list_for_each_entry_safe(rr, n, &debris, rr_list) { 1764174edb0eSDarrick J. Wong list_del(&rr->rr_list); 1765174edb0eSDarrick J. Wong kmem_free(rr); 1766174edb0eSDarrick J. Wong } 1767174edb0eSDarrick J. Wong return error; 1768174edb0eSDarrick J. Wong } 176949db55ecSDarrick J. Wong 177049db55ecSDarrick J. Wong /* Is there a record covering a given extent? */ 177149db55ecSDarrick J. Wong int 177249db55ecSDarrick J. Wong xfs_refcount_has_record( 177349db55ecSDarrick J. Wong struct xfs_btree_cur *cur, 177449db55ecSDarrick J. Wong xfs_agblock_t bno, 177549db55ecSDarrick J. Wong xfs_extlen_t len, 177649db55ecSDarrick J. Wong bool *exists) 177749db55ecSDarrick J. Wong { 177849db55ecSDarrick J. Wong union xfs_btree_irec low; 177949db55ecSDarrick J. Wong union xfs_btree_irec high; 178049db55ecSDarrick J. Wong 178149db55ecSDarrick J. Wong memset(&low, 0, sizeof(low)); 178249db55ecSDarrick J. Wong low.rc.rc_startblock = bno; 178349db55ecSDarrick J. Wong memset(&high, 0xFF, sizeof(high)); 178449db55ecSDarrick J. Wong high.rc.rc_startblock = bno + len - 1; 178549db55ecSDarrick J. Wong 178649db55ecSDarrick J. Wong return xfs_btree_has_record(cur, &low, &high, exists); 178749db55ecSDarrick J. Wong } 1788f3c799c2SDarrick J. Wong 1789f3c799c2SDarrick J. Wong int __init 1790f3c799c2SDarrick J. Wong xfs_refcount_intent_init_cache(void) 1791f3c799c2SDarrick J. Wong { 1792f3c799c2SDarrick J. Wong xfs_refcount_intent_cache = kmem_cache_create("xfs_refc_intent", 1793f3c799c2SDarrick J. Wong sizeof(struct xfs_refcount_intent), 1794f3c799c2SDarrick J. Wong 0, 0, NULL); 1795f3c799c2SDarrick J. Wong 1796f3c799c2SDarrick J. Wong return xfs_refcount_intent_cache != NULL ? 0 : -ENOMEM; 1797f3c799c2SDarrick J. Wong } 1798f3c799c2SDarrick J. Wong 1799f3c799c2SDarrick J. Wong void 1800f3c799c2SDarrick J. Wong xfs_refcount_intent_destroy_cache(void) 1801f3c799c2SDarrick J. Wong { 1802f3c799c2SDarrick J. Wong kmem_cache_destroy(xfs_refcount_intent_cache); 1803f3c799c2SDarrick J. Wong xfs_refcount_intent_cache = NULL; 1804f3c799c2SDarrick J. Wong } 1805