1bdf28630SDarrick J. Wong /* 2bdf28630SDarrick J. Wong * Copyright (C) 2016 Oracle. All Rights Reserved. 3bdf28630SDarrick J. Wong * 4bdf28630SDarrick J. Wong * Author: Darrick J. Wong <darrick.wong@oracle.com> 5bdf28630SDarrick J. Wong * 6bdf28630SDarrick J. Wong * This program is free software; you can redistribute it and/or 7bdf28630SDarrick J. Wong * modify it under the terms of the GNU General Public License 8bdf28630SDarrick J. Wong * as published by the Free Software Foundation; either version 2 9bdf28630SDarrick J. Wong * of the License, or (at your option) any later version. 10bdf28630SDarrick J. Wong * 11bdf28630SDarrick J. Wong * This program is distributed in the hope that it would be useful, 12bdf28630SDarrick J. Wong * but WITHOUT ANY WARRANTY; without even the implied warranty of 13bdf28630SDarrick J. Wong * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14bdf28630SDarrick J. Wong * GNU General Public License for more details. 15bdf28630SDarrick J. Wong * 16bdf28630SDarrick J. Wong * You should have received a copy of the GNU General Public License 17bdf28630SDarrick J. Wong * along with this program; if not, write the Free Software Foundation, 18bdf28630SDarrick J. Wong * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. 19bdf28630SDarrick J. Wong */ 20bdf28630SDarrick J. Wong #include "xfs.h" 21bdf28630SDarrick J. Wong #include "xfs_fs.h" 22bdf28630SDarrick J. Wong #include "xfs_shared.h" 23bdf28630SDarrick J. Wong #include "xfs_format.h" 24bdf28630SDarrick J. Wong #include "xfs_log_format.h" 25bdf28630SDarrick J. Wong #include "xfs_trans_resv.h" 26bdf28630SDarrick J. Wong #include "xfs_sb.h" 27bdf28630SDarrick J. Wong #include "xfs_mount.h" 28bdf28630SDarrick J. Wong #include "xfs_defer.h" 29bdf28630SDarrick J. Wong #include "xfs_btree.h" 30bdf28630SDarrick J. Wong #include "xfs_bmap.h" 31bdf28630SDarrick J. Wong #include "xfs_refcount_btree.h" 32bdf28630SDarrick J. Wong #include "xfs_alloc.h" 33bdf28630SDarrick J. Wong #include "xfs_error.h" 34bdf28630SDarrick J. Wong #include "xfs_trace.h" 35bdf28630SDarrick J. Wong #include "xfs_cksum.h" 36bdf28630SDarrick J. Wong #include "xfs_trans.h" 37bdf28630SDarrick J. Wong #include "xfs_bit.h" 38bdf28630SDarrick J. Wong #include "xfs_refcount.h" 39174edb0eSDarrick J. Wong #include "xfs_rmap.h" 40bdf28630SDarrick J. Wong 4131727258SDarrick J. Wong /* Allowable refcount adjustment amounts. */ 4231727258SDarrick J. Wong enum xfs_refc_adjust_op { 4331727258SDarrick J. Wong XFS_REFCOUNT_ADJUST_INCREASE = 1, 4431727258SDarrick J. Wong XFS_REFCOUNT_ADJUST_DECREASE = -1, 45174edb0eSDarrick J. Wong XFS_REFCOUNT_ADJUST_COW_ALLOC = 0, 46174edb0eSDarrick J. Wong XFS_REFCOUNT_ADJUST_COW_FREE = -1, 4731727258SDarrick J. Wong }; 4831727258SDarrick J. Wong 49174edb0eSDarrick J. Wong STATIC int __xfs_refcount_cow_alloc(struct xfs_btree_cur *rcur, 50174edb0eSDarrick J. Wong xfs_agblock_t agbno, xfs_extlen_t aglen, 51174edb0eSDarrick J. Wong struct xfs_defer_ops *dfops); 52174edb0eSDarrick J. Wong STATIC int __xfs_refcount_cow_free(struct xfs_btree_cur *rcur, 53174edb0eSDarrick J. Wong xfs_agblock_t agbno, xfs_extlen_t aglen, 54174edb0eSDarrick J. Wong struct xfs_defer_ops *dfops); 55174edb0eSDarrick J. Wong 56bdf28630SDarrick J. Wong /* 57bdf28630SDarrick J. Wong * Look up the first record less than or equal to [bno, len] in the btree 58bdf28630SDarrick J. Wong * given by cur. 59bdf28630SDarrick J. Wong */ 60bdf28630SDarrick J. Wong int 61bdf28630SDarrick J. Wong xfs_refcount_lookup_le( 62bdf28630SDarrick J. Wong struct xfs_btree_cur *cur, 63bdf28630SDarrick J. Wong xfs_agblock_t bno, 64bdf28630SDarrick J. Wong int *stat) 65bdf28630SDarrick J. Wong { 66bdf28630SDarrick J. Wong trace_xfs_refcount_lookup(cur->bc_mp, cur->bc_private.a.agno, bno, 67bdf28630SDarrick J. Wong XFS_LOOKUP_LE); 68bdf28630SDarrick J. Wong cur->bc_rec.rc.rc_startblock = bno; 69bdf28630SDarrick J. Wong cur->bc_rec.rc.rc_blockcount = 0; 70bdf28630SDarrick J. Wong return xfs_btree_lookup(cur, XFS_LOOKUP_LE, stat); 71bdf28630SDarrick J. Wong } 72bdf28630SDarrick J. Wong 73bdf28630SDarrick J. Wong /* 74bdf28630SDarrick J. Wong * Look up the first record greater than or equal to [bno, len] in the btree 75bdf28630SDarrick J. Wong * given by cur. 76bdf28630SDarrick J. Wong */ 77bdf28630SDarrick J. Wong int 78bdf28630SDarrick J. Wong xfs_refcount_lookup_ge( 79bdf28630SDarrick J. Wong struct xfs_btree_cur *cur, 80bdf28630SDarrick J. Wong xfs_agblock_t bno, 81bdf28630SDarrick J. Wong int *stat) 82bdf28630SDarrick J. Wong { 83bdf28630SDarrick J. Wong trace_xfs_refcount_lookup(cur->bc_mp, cur->bc_private.a.agno, bno, 84bdf28630SDarrick J. Wong XFS_LOOKUP_GE); 85bdf28630SDarrick J. Wong cur->bc_rec.rc.rc_startblock = bno; 86bdf28630SDarrick J. Wong cur->bc_rec.rc.rc_blockcount = 0; 87bdf28630SDarrick J. Wong return xfs_btree_lookup(cur, XFS_LOOKUP_GE, stat); 88bdf28630SDarrick J. Wong } 89bdf28630SDarrick J. Wong 90174edb0eSDarrick J. Wong /* Convert on-disk record to in-core format. */ 91174edb0eSDarrick J. Wong static inline void 92174edb0eSDarrick J. Wong xfs_refcount_btrec_to_irec( 93174edb0eSDarrick J. Wong union xfs_btree_rec *rec, 94174edb0eSDarrick J. Wong struct xfs_refcount_irec *irec) 95174edb0eSDarrick J. Wong { 96174edb0eSDarrick J. Wong irec->rc_startblock = be32_to_cpu(rec->refc.rc_startblock); 97174edb0eSDarrick J. Wong irec->rc_blockcount = be32_to_cpu(rec->refc.rc_blockcount); 98174edb0eSDarrick J. Wong irec->rc_refcount = be32_to_cpu(rec->refc.rc_refcount); 99174edb0eSDarrick J. Wong } 100174edb0eSDarrick J. Wong 101bdf28630SDarrick J. Wong /* 102bdf28630SDarrick J. Wong * Get the data from the pointed-to record. 103bdf28630SDarrick J. Wong */ 104bdf28630SDarrick J. Wong int 105bdf28630SDarrick J. Wong xfs_refcount_get_rec( 106bdf28630SDarrick J. Wong struct xfs_btree_cur *cur, 107bdf28630SDarrick J. Wong struct xfs_refcount_irec *irec, 108bdf28630SDarrick J. Wong int *stat) 109bdf28630SDarrick J. Wong { 110bdf28630SDarrick J. Wong union xfs_btree_rec *rec; 111bdf28630SDarrick J. Wong int error; 112bdf28630SDarrick J. Wong 113bdf28630SDarrick J. Wong error = xfs_btree_get_rec(cur, &rec, stat); 114bdf28630SDarrick J. Wong if (!error && *stat == 1) { 115174edb0eSDarrick J. Wong xfs_refcount_btrec_to_irec(rec, irec); 116bdf28630SDarrick J. Wong trace_xfs_refcount_get(cur->bc_mp, cur->bc_private.a.agno, 117bdf28630SDarrick J. Wong irec); 118bdf28630SDarrick J. Wong } 119bdf28630SDarrick J. Wong return error; 120bdf28630SDarrick J. Wong } 121bdf28630SDarrick J. Wong 122bdf28630SDarrick J. Wong /* 123bdf28630SDarrick J. Wong * Update the record referred to by cur to the value given 124bdf28630SDarrick J. Wong * by [bno, len, refcount]. 125bdf28630SDarrick J. Wong * This either works (return 0) or gets an EFSCORRUPTED error. 126bdf28630SDarrick J. Wong */ 127bdf28630SDarrick J. Wong STATIC int 128bdf28630SDarrick J. Wong xfs_refcount_update( 129bdf28630SDarrick J. Wong struct xfs_btree_cur *cur, 130bdf28630SDarrick J. Wong struct xfs_refcount_irec *irec) 131bdf28630SDarrick J. Wong { 132bdf28630SDarrick J. Wong union xfs_btree_rec rec; 133bdf28630SDarrick J. Wong int error; 134bdf28630SDarrick J. Wong 135bdf28630SDarrick J. Wong trace_xfs_refcount_update(cur->bc_mp, cur->bc_private.a.agno, irec); 136bdf28630SDarrick J. Wong rec.refc.rc_startblock = cpu_to_be32(irec->rc_startblock); 137bdf28630SDarrick J. Wong rec.refc.rc_blockcount = cpu_to_be32(irec->rc_blockcount); 138bdf28630SDarrick J. Wong rec.refc.rc_refcount = cpu_to_be32(irec->rc_refcount); 139bdf28630SDarrick J. Wong error = xfs_btree_update(cur, &rec); 140bdf28630SDarrick J. Wong if (error) 141bdf28630SDarrick J. Wong trace_xfs_refcount_update_error(cur->bc_mp, 142bdf28630SDarrick J. Wong cur->bc_private.a.agno, error, _RET_IP_); 143bdf28630SDarrick J. Wong return error; 144bdf28630SDarrick J. Wong } 145bdf28630SDarrick J. Wong 146bdf28630SDarrick J. Wong /* 147bdf28630SDarrick J. Wong * Insert the record referred to by cur to the value given 148bdf28630SDarrick J. Wong * by [bno, len, refcount]. 149bdf28630SDarrick J. Wong * This either works (return 0) or gets an EFSCORRUPTED error. 150bdf28630SDarrick J. Wong */ 151bdf28630SDarrick J. Wong STATIC int 152bdf28630SDarrick J. Wong xfs_refcount_insert( 153bdf28630SDarrick J. Wong struct xfs_btree_cur *cur, 154bdf28630SDarrick J. Wong struct xfs_refcount_irec *irec, 155bdf28630SDarrick J. Wong int *i) 156bdf28630SDarrick J. Wong { 157bdf28630SDarrick J. Wong int error; 158bdf28630SDarrick J. Wong 159bdf28630SDarrick J. Wong trace_xfs_refcount_insert(cur->bc_mp, cur->bc_private.a.agno, irec); 160bdf28630SDarrick J. Wong cur->bc_rec.rc.rc_startblock = irec->rc_startblock; 161bdf28630SDarrick J. Wong cur->bc_rec.rc.rc_blockcount = irec->rc_blockcount; 162bdf28630SDarrick J. Wong cur->bc_rec.rc.rc_refcount = irec->rc_refcount; 163bdf28630SDarrick J. Wong error = xfs_btree_insert(cur, i); 164bdf28630SDarrick J. Wong XFS_WANT_CORRUPTED_GOTO(cur->bc_mp, *i == 1, out_error); 165bdf28630SDarrick J. Wong out_error: 166bdf28630SDarrick J. Wong if (error) 167bdf28630SDarrick J. Wong trace_xfs_refcount_insert_error(cur->bc_mp, 168bdf28630SDarrick J. Wong cur->bc_private.a.agno, error, _RET_IP_); 169bdf28630SDarrick J. Wong return error; 170bdf28630SDarrick J. Wong } 171bdf28630SDarrick J. Wong 172bdf28630SDarrick J. Wong /* 173bdf28630SDarrick J. Wong * Remove the record referred to by cur, then set the pointer to the spot 174bdf28630SDarrick J. Wong * where the record could be re-inserted, in case we want to increment or 175bdf28630SDarrick J. Wong * decrement the cursor. 176bdf28630SDarrick J. Wong * This either works (return 0) or gets an EFSCORRUPTED error. 177bdf28630SDarrick J. Wong */ 178bdf28630SDarrick J. Wong STATIC int 179bdf28630SDarrick J. Wong xfs_refcount_delete( 180bdf28630SDarrick J. Wong struct xfs_btree_cur *cur, 181bdf28630SDarrick J. Wong int *i) 182bdf28630SDarrick J. Wong { 183bdf28630SDarrick J. Wong struct xfs_refcount_irec irec; 184bdf28630SDarrick J. Wong int found_rec; 185bdf28630SDarrick J. Wong int error; 186bdf28630SDarrick J. Wong 187bdf28630SDarrick J. Wong error = xfs_refcount_get_rec(cur, &irec, &found_rec); 188bdf28630SDarrick J. Wong if (error) 189bdf28630SDarrick J. Wong goto out_error; 190bdf28630SDarrick J. Wong XFS_WANT_CORRUPTED_GOTO(cur->bc_mp, found_rec == 1, out_error); 191bdf28630SDarrick J. Wong trace_xfs_refcount_delete(cur->bc_mp, cur->bc_private.a.agno, &irec); 192bdf28630SDarrick J. Wong error = xfs_btree_delete(cur, i); 193bdf28630SDarrick J. Wong XFS_WANT_CORRUPTED_GOTO(cur->bc_mp, *i == 1, out_error); 194bdf28630SDarrick J. Wong if (error) 195bdf28630SDarrick J. Wong goto out_error; 196bdf28630SDarrick J. Wong error = xfs_refcount_lookup_ge(cur, irec.rc_startblock, &found_rec); 197bdf28630SDarrick J. Wong out_error: 198bdf28630SDarrick J. Wong if (error) 199bdf28630SDarrick J. Wong trace_xfs_refcount_delete_error(cur->bc_mp, 200bdf28630SDarrick J. Wong cur->bc_private.a.agno, error, _RET_IP_); 201bdf28630SDarrick J. Wong return error; 202bdf28630SDarrick J. Wong } 20331727258SDarrick J. Wong 20431727258SDarrick J. Wong /* 20531727258SDarrick J. Wong * Adjusting the Reference Count 20631727258SDarrick J. Wong * 20731727258SDarrick J. Wong * As stated elsewhere, the reference count btree (refcbt) stores 20831727258SDarrick J. Wong * >1 reference counts for extents of physical blocks. In this 20931727258SDarrick J. Wong * operation, we're either raising or lowering the reference count of 21031727258SDarrick J. Wong * some subrange stored in the tree: 21131727258SDarrick J. Wong * 21231727258SDarrick J. Wong * <------ adjustment range ------> 21331727258SDarrick J. Wong * ----+ +---+-----+ +--+--------+--------- 21431727258SDarrick J. Wong * 2 | | 3 | 4 | |17| 55 | 10 21531727258SDarrick J. Wong * ----+ +---+-----+ +--+--------+--------- 21631727258SDarrick J. Wong * X axis is physical blocks number; 21731727258SDarrick J. Wong * reference counts are the numbers inside the rectangles 21831727258SDarrick J. Wong * 21931727258SDarrick J. Wong * The first thing we need to do is to ensure that there are no 22031727258SDarrick J. Wong * refcount extents crossing either boundary of the range to be 22131727258SDarrick J. Wong * adjusted. For any extent that does cross a boundary, split it into 22231727258SDarrick J. Wong * two extents so that we can increment the refcount of one of the 22331727258SDarrick J. Wong * pieces later: 22431727258SDarrick J. Wong * 22531727258SDarrick J. Wong * <------ adjustment range ------> 22631727258SDarrick J. Wong * ----+ +---+-----+ +--+--------+----+---- 22731727258SDarrick J. Wong * 2 | | 3 | 2 | |17| 55 | 10 | 10 22831727258SDarrick J. Wong * ----+ +---+-----+ +--+--------+----+---- 22931727258SDarrick J. Wong * 23031727258SDarrick J. Wong * For this next step, let's assume that all the physical blocks in 23131727258SDarrick J. Wong * the adjustment range are mapped to a file and are therefore in use 23231727258SDarrick J. Wong * at least once. Therefore, we can infer that any gap in the 23331727258SDarrick J. Wong * refcount tree within the adjustment range represents a physical 23431727258SDarrick J. Wong * extent with refcount == 1: 23531727258SDarrick J. Wong * 23631727258SDarrick J. Wong * <------ adjustment range ------> 23731727258SDarrick J. Wong * ----+---+---+-----+-+--+--------+----+---- 23831727258SDarrick J. Wong * 2 |"1"| 3 | 2 |1|17| 55 | 10 | 10 23931727258SDarrick J. Wong * ----+---+---+-----+-+--+--------+----+---- 24031727258SDarrick J. Wong * ^ 24131727258SDarrick J. Wong * 24231727258SDarrick J. Wong * For each extent that falls within the interval range, figure out 24331727258SDarrick J. Wong * which extent is to the left or the right of that extent. Now we 24431727258SDarrick J. Wong * have a left, current, and right extent. If the new reference count 24531727258SDarrick J. Wong * of the center extent enables us to merge left, center, and right 24631727258SDarrick J. Wong * into one record covering all three, do so. If the center extent is 24731727258SDarrick J. Wong * at the left end of the range, abuts the left extent, and its new 24831727258SDarrick J. Wong * reference count matches the left extent's record, then merge them. 24931727258SDarrick J. Wong * If the center extent is at the right end of the range, abuts the 25031727258SDarrick J. Wong * right extent, and the reference counts match, merge those. In the 25131727258SDarrick J. Wong * example, we can left merge (assuming an increment operation): 25231727258SDarrick J. Wong * 25331727258SDarrick J. Wong * <------ adjustment range ------> 25431727258SDarrick J. Wong * --------+---+-----+-+--+--------+----+---- 25531727258SDarrick J. Wong * 2 | 3 | 2 |1|17| 55 | 10 | 10 25631727258SDarrick J. Wong * --------+---+-----+-+--+--------+----+---- 25731727258SDarrick J. Wong * ^ 25831727258SDarrick J. Wong * 25931727258SDarrick J. Wong * For all other extents within the range, adjust the reference count 26031727258SDarrick J. Wong * or delete it if the refcount falls below 2. If we were 26131727258SDarrick J. Wong * incrementing, the end result looks like this: 26231727258SDarrick J. Wong * 26331727258SDarrick J. Wong * <------ adjustment range ------> 26431727258SDarrick J. Wong * --------+---+-----+-+--+--------+----+---- 26531727258SDarrick J. Wong * 2 | 4 | 3 |2|18| 56 | 11 | 10 26631727258SDarrick J. Wong * --------+---+-----+-+--+--------+----+---- 26731727258SDarrick J. Wong * 26831727258SDarrick J. Wong * The result of a decrement operation looks as such: 26931727258SDarrick J. Wong * 27031727258SDarrick J. Wong * <------ adjustment range ------> 27131727258SDarrick J. Wong * ----+ +---+ +--+--------+----+---- 27231727258SDarrick J. Wong * 2 | | 2 | |16| 54 | 9 | 10 27331727258SDarrick J. Wong * ----+ +---+ +--+--------+----+---- 27431727258SDarrick J. Wong * DDDD 111111DD 27531727258SDarrick J. Wong * 27631727258SDarrick J. Wong * The blocks marked "D" are freed; the blocks marked "1" are only 27731727258SDarrick J. Wong * referenced once and therefore the record is removed from the 27831727258SDarrick J. Wong * refcount btree. 27931727258SDarrick J. Wong */ 28031727258SDarrick J. Wong 28131727258SDarrick J. Wong /* Next block after this extent. */ 28231727258SDarrick J. Wong static inline xfs_agblock_t 28331727258SDarrick J. Wong xfs_refc_next( 28431727258SDarrick J. Wong struct xfs_refcount_irec *rc) 28531727258SDarrick J. Wong { 28631727258SDarrick J. Wong return rc->rc_startblock + rc->rc_blockcount; 28731727258SDarrick J. Wong } 28831727258SDarrick J. Wong 28931727258SDarrick J. Wong /* 29031727258SDarrick J. Wong * Split a refcount extent that crosses agbno. 29131727258SDarrick J. Wong */ 29231727258SDarrick J. Wong STATIC int 29331727258SDarrick J. Wong xfs_refcount_split_extent( 29431727258SDarrick J. Wong struct xfs_btree_cur *cur, 29531727258SDarrick J. Wong xfs_agblock_t agbno, 29631727258SDarrick J. Wong bool *shape_changed) 29731727258SDarrick J. Wong { 29831727258SDarrick J. Wong struct xfs_refcount_irec rcext, tmp; 29931727258SDarrick J. Wong int found_rec; 30031727258SDarrick J. Wong int error; 30131727258SDarrick J. Wong 30231727258SDarrick J. Wong *shape_changed = false; 30331727258SDarrick J. Wong error = xfs_refcount_lookup_le(cur, agbno, &found_rec); 30431727258SDarrick J. Wong if (error) 30531727258SDarrick J. Wong goto out_error; 30631727258SDarrick J. Wong if (!found_rec) 30731727258SDarrick J. Wong return 0; 30831727258SDarrick J. Wong 30931727258SDarrick J. Wong error = xfs_refcount_get_rec(cur, &rcext, &found_rec); 31031727258SDarrick J. Wong if (error) 31131727258SDarrick J. Wong goto out_error; 31231727258SDarrick J. Wong XFS_WANT_CORRUPTED_GOTO(cur->bc_mp, found_rec == 1, out_error); 31331727258SDarrick J. Wong if (rcext.rc_startblock == agbno || xfs_refc_next(&rcext) <= agbno) 31431727258SDarrick J. Wong return 0; 31531727258SDarrick J. Wong 31631727258SDarrick J. Wong *shape_changed = true; 31731727258SDarrick J. Wong trace_xfs_refcount_split_extent(cur->bc_mp, cur->bc_private.a.agno, 31831727258SDarrick J. Wong &rcext, agbno); 31931727258SDarrick J. Wong 32031727258SDarrick J. Wong /* Establish the right extent. */ 32131727258SDarrick J. Wong tmp = rcext; 32231727258SDarrick J. Wong tmp.rc_startblock = agbno; 32331727258SDarrick J. Wong tmp.rc_blockcount -= (agbno - rcext.rc_startblock); 32431727258SDarrick J. Wong error = xfs_refcount_update(cur, &tmp); 32531727258SDarrick J. Wong if (error) 32631727258SDarrick J. Wong goto out_error; 32731727258SDarrick J. Wong 32831727258SDarrick J. Wong /* Insert the left extent. */ 32931727258SDarrick J. Wong tmp = rcext; 33031727258SDarrick J. Wong tmp.rc_blockcount = agbno - rcext.rc_startblock; 33131727258SDarrick J. Wong error = xfs_refcount_insert(cur, &tmp, &found_rec); 33231727258SDarrick J. Wong if (error) 33331727258SDarrick J. Wong goto out_error; 33431727258SDarrick J. Wong XFS_WANT_CORRUPTED_GOTO(cur->bc_mp, found_rec == 1, out_error); 33531727258SDarrick J. Wong return error; 33631727258SDarrick J. Wong 33731727258SDarrick J. Wong out_error: 33831727258SDarrick J. Wong trace_xfs_refcount_split_extent_error(cur->bc_mp, 33931727258SDarrick J. Wong cur->bc_private.a.agno, error, _RET_IP_); 34031727258SDarrick J. Wong return error; 34131727258SDarrick J. Wong } 34231727258SDarrick J. Wong 34331727258SDarrick J. Wong /* 34431727258SDarrick J. Wong * Merge the left, center, and right extents. 34531727258SDarrick J. Wong */ 34631727258SDarrick J. Wong STATIC int 34731727258SDarrick J. Wong xfs_refcount_merge_center_extents( 34831727258SDarrick J. Wong struct xfs_btree_cur *cur, 34931727258SDarrick J. Wong struct xfs_refcount_irec *left, 35031727258SDarrick J. Wong struct xfs_refcount_irec *center, 35131727258SDarrick J. Wong struct xfs_refcount_irec *right, 35231727258SDarrick J. Wong unsigned long long extlen, 35331727258SDarrick J. Wong xfs_agblock_t *agbno, 35431727258SDarrick J. Wong xfs_extlen_t *aglen) 35531727258SDarrick J. Wong { 35631727258SDarrick J. Wong int error; 35731727258SDarrick J. Wong int found_rec; 35831727258SDarrick J. Wong 35931727258SDarrick J. Wong trace_xfs_refcount_merge_center_extents(cur->bc_mp, 36031727258SDarrick J. Wong cur->bc_private.a.agno, left, center, right); 36131727258SDarrick J. Wong 36231727258SDarrick J. Wong /* 36331727258SDarrick J. Wong * Make sure the center and right extents are not in the btree. 36431727258SDarrick J. Wong * If the center extent was synthesized, the first delete call 36531727258SDarrick J. Wong * removes the right extent and we skip the second deletion. 36631727258SDarrick J. Wong * If center and right were in the btree, then the first delete 36731727258SDarrick J. Wong * call removes the center and the second one removes the right 36831727258SDarrick J. Wong * extent. 36931727258SDarrick J. Wong */ 37031727258SDarrick J. Wong error = xfs_refcount_lookup_ge(cur, center->rc_startblock, 37131727258SDarrick J. Wong &found_rec); 37231727258SDarrick J. Wong if (error) 37331727258SDarrick J. Wong goto out_error; 37431727258SDarrick J. Wong XFS_WANT_CORRUPTED_GOTO(cur->bc_mp, found_rec == 1, out_error); 37531727258SDarrick J. Wong 37631727258SDarrick J. Wong error = xfs_refcount_delete(cur, &found_rec); 37731727258SDarrick J. Wong if (error) 37831727258SDarrick J. Wong goto out_error; 37931727258SDarrick J. Wong XFS_WANT_CORRUPTED_GOTO(cur->bc_mp, found_rec == 1, out_error); 38031727258SDarrick J. Wong 38131727258SDarrick J. Wong if (center->rc_refcount > 1) { 38231727258SDarrick J. Wong error = xfs_refcount_delete(cur, &found_rec); 38331727258SDarrick J. Wong if (error) 38431727258SDarrick J. Wong goto out_error; 38531727258SDarrick J. Wong XFS_WANT_CORRUPTED_GOTO(cur->bc_mp, found_rec == 1, 38631727258SDarrick J. Wong out_error); 38731727258SDarrick J. Wong } 38831727258SDarrick J. Wong 38931727258SDarrick J. Wong /* Enlarge the left extent. */ 39031727258SDarrick J. Wong error = xfs_refcount_lookup_le(cur, left->rc_startblock, 39131727258SDarrick J. Wong &found_rec); 39231727258SDarrick J. Wong if (error) 39331727258SDarrick J. Wong goto out_error; 39431727258SDarrick J. Wong XFS_WANT_CORRUPTED_GOTO(cur->bc_mp, found_rec == 1, out_error); 39531727258SDarrick J. Wong 39631727258SDarrick J. Wong left->rc_blockcount = extlen; 39731727258SDarrick J. Wong error = xfs_refcount_update(cur, left); 39831727258SDarrick J. Wong if (error) 39931727258SDarrick J. Wong goto out_error; 40031727258SDarrick J. Wong 40131727258SDarrick J. Wong *aglen = 0; 40231727258SDarrick J. Wong return error; 40331727258SDarrick J. Wong 40431727258SDarrick J. Wong out_error: 40531727258SDarrick J. Wong trace_xfs_refcount_merge_center_extents_error(cur->bc_mp, 40631727258SDarrick J. Wong cur->bc_private.a.agno, error, _RET_IP_); 40731727258SDarrick J. Wong return error; 40831727258SDarrick J. Wong } 40931727258SDarrick J. Wong 41031727258SDarrick J. Wong /* 41131727258SDarrick J. Wong * Merge with the left extent. 41231727258SDarrick J. Wong */ 41331727258SDarrick J. Wong STATIC int 41431727258SDarrick J. Wong xfs_refcount_merge_left_extent( 41531727258SDarrick J. Wong struct xfs_btree_cur *cur, 41631727258SDarrick J. Wong struct xfs_refcount_irec *left, 41731727258SDarrick J. Wong struct xfs_refcount_irec *cleft, 41831727258SDarrick J. Wong xfs_agblock_t *agbno, 41931727258SDarrick J. Wong xfs_extlen_t *aglen) 42031727258SDarrick J. Wong { 42131727258SDarrick J. Wong int error; 42231727258SDarrick J. Wong int found_rec; 42331727258SDarrick J. Wong 42431727258SDarrick J. Wong trace_xfs_refcount_merge_left_extent(cur->bc_mp, 42531727258SDarrick J. Wong cur->bc_private.a.agno, left, cleft); 42631727258SDarrick J. Wong 42731727258SDarrick J. Wong /* If the extent at agbno (cleft) wasn't synthesized, remove it. */ 42831727258SDarrick J. Wong if (cleft->rc_refcount > 1) { 42931727258SDarrick J. Wong error = xfs_refcount_lookup_le(cur, cleft->rc_startblock, 43031727258SDarrick J. Wong &found_rec); 43131727258SDarrick J. Wong if (error) 43231727258SDarrick J. Wong goto out_error; 43331727258SDarrick J. Wong XFS_WANT_CORRUPTED_GOTO(cur->bc_mp, found_rec == 1, 43431727258SDarrick J. Wong out_error); 43531727258SDarrick J. Wong 43631727258SDarrick J. Wong error = xfs_refcount_delete(cur, &found_rec); 43731727258SDarrick J. Wong if (error) 43831727258SDarrick J. Wong goto out_error; 43931727258SDarrick J. Wong XFS_WANT_CORRUPTED_GOTO(cur->bc_mp, found_rec == 1, 44031727258SDarrick J. Wong out_error); 44131727258SDarrick J. Wong } 44231727258SDarrick J. Wong 44331727258SDarrick J. Wong /* Enlarge the left extent. */ 44431727258SDarrick J. Wong error = xfs_refcount_lookup_le(cur, left->rc_startblock, 44531727258SDarrick J. Wong &found_rec); 44631727258SDarrick J. Wong if (error) 44731727258SDarrick J. Wong goto out_error; 44831727258SDarrick J. Wong XFS_WANT_CORRUPTED_GOTO(cur->bc_mp, found_rec == 1, out_error); 44931727258SDarrick J. Wong 45031727258SDarrick J. Wong left->rc_blockcount += cleft->rc_blockcount; 45131727258SDarrick J. Wong error = xfs_refcount_update(cur, left); 45231727258SDarrick J. Wong if (error) 45331727258SDarrick J. Wong goto out_error; 45431727258SDarrick J. Wong 45531727258SDarrick J. Wong *agbno += cleft->rc_blockcount; 45631727258SDarrick J. Wong *aglen -= cleft->rc_blockcount; 45731727258SDarrick J. Wong return error; 45831727258SDarrick J. Wong 45931727258SDarrick J. Wong out_error: 46031727258SDarrick J. Wong trace_xfs_refcount_merge_left_extent_error(cur->bc_mp, 46131727258SDarrick J. Wong cur->bc_private.a.agno, error, _RET_IP_); 46231727258SDarrick J. Wong return error; 46331727258SDarrick J. Wong } 46431727258SDarrick J. Wong 46531727258SDarrick J. Wong /* 46631727258SDarrick J. Wong * Merge with the right extent. 46731727258SDarrick J. Wong */ 46831727258SDarrick J. Wong STATIC int 46931727258SDarrick J. Wong xfs_refcount_merge_right_extent( 47031727258SDarrick J. Wong struct xfs_btree_cur *cur, 47131727258SDarrick J. Wong struct xfs_refcount_irec *right, 47231727258SDarrick J. Wong struct xfs_refcount_irec *cright, 47331727258SDarrick J. Wong xfs_agblock_t *agbno, 47431727258SDarrick J. Wong xfs_extlen_t *aglen) 47531727258SDarrick J. Wong { 47631727258SDarrick J. Wong int error; 47731727258SDarrick J. Wong int found_rec; 47831727258SDarrick J. Wong 47931727258SDarrick J. Wong trace_xfs_refcount_merge_right_extent(cur->bc_mp, 48031727258SDarrick J. Wong cur->bc_private.a.agno, cright, right); 48131727258SDarrick J. Wong 48231727258SDarrick J. Wong /* 48331727258SDarrick J. Wong * If the extent ending at agbno+aglen (cright) wasn't synthesized, 48431727258SDarrick J. Wong * remove it. 48531727258SDarrick J. Wong */ 48631727258SDarrick J. Wong if (cright->rc_refcount > 1) { 48731727258SDarrick J. Wong error = xfs_refcount_lookup_le(cur, cright->rc_startblock, 48831727258SDarrick J. Wong &found_rec); 48931727258SDarrick J. Wong if (error) 49031727258SDarrick J. Wong goto out_error; 49131727258SDarrick J. Wong XFS_WANT_CORRUPTED_GOTO(cur->bc_mp, found_rec == 1, 49231727258SDarrick J. Wong out_error); 49331727258SDarrick J. Wong 49431727258SDarrick J. Wong error = xfs_refcount_delete(cur, &found_rec); 49531727258SDarrick J. Wong if (error) 49631727258SDarrick J. Wong goto out_error; 49731727258SDarrick J. Wong XFS_WANT_CORRUPTED_GOTO(cur->bc_mp, found_rec == 1, 49831727258SDarrick J. Wong out_error); 49931727258SDarrick J. Wong } 50031727258SDarrick J. Wong 50131727258SDarrick J. Wong /* Enlarge the right extent. */ 50231727258SDarrick J. Wong error = xfs_refcount_lookup_le(cur, right->rc_startblock, 50331727258SDarrick J. Wong &found_rec); 50431727258SDarrick J. Wong if (error) 50531727258SDarrick J. Wong goto out_error; 50631727258SDarrick J. Wong XFS_WANT_CORRUPTED_GOTO(cur->bc_mp, found_rec == 1, out_error); 50731727258SDarrick J. Wong 50831727258SDarrick J. Wong right->rc_startblock -= cright->rc_blockcount; 50931727258SDarrick J. Wong right->rc_blockcount += cright->rc_blockcount; 51031727258SDarrick J. Wong error = xfs_refcount_update(cur, right); 51131727258SDarrick J. Wong if (error) 51231727258SDarrick J. Wong goto out_error; 51331727258SDarrick J. Wong 51431727258SDarrick J. Wong *aglen -= cright->rc_blockcount; 51531727258SDarrick J. Wong return error; 51631727258SDarrick J. Wong 51731727258SDarrick J. Wong out_error: 51831727258SDarrick J. Wong trace_xfs_refcount_merge_right_extent_error(cur->bc_mp, 51931727258SDarrick J. Wong cur->bc_private.a.agno, error, _RET_IP_); 52031727258SDarrick J. Wong return error; 52131727258SDarrick J. Wong } 52231727258SDarrick J. Wong 523174edb0eSDarrick J. Wong #define XFS_FIND_RCEXT_SHARED 1 524174edb0eSDarrick J. Wong #define XFS_FIND_RCEXT_COW 2 52531727258SDarrick J. Wong /* 52631727258SDarrick J. Wong * Find the left extent and the one after it (cleft). This function assumes 52731727258SDarrick J. Wong * that we've already split any extent crossing agbno. 52831727258SDarrick J. Wong */ 52931727258SDarrick J. Wong STATIC int 53031727258SDarrick J. Wong xfs_refcount_find_left_extents( 53131727258SDarrick J. Wong struct xfs_btree_cur *cur, 53231727258SDarrick J. Wong struct xfs_refcount_irec *left, 53331727258SDarrick J. Wong struct xfs_refcount_irec *cleft, 53431727258SDarrick J. Wong xfs_agblock_t agbno, 535174edb0eSDarrick J. Wong xfs_extlen_t aglen, 536174edb0eSDarrick J. Wong int flags) 53731727258SDarrick J. Wong { 53831727258SDarrick J. Wong struct xfs_refcount_irec tmp; 53931727258SDarrick J. Wong int error; 54031727258SDarrick J. Wong int found_rec; 54131727258SDarrick J. Wong 54231727258SDarrick J. Wong left->rc_startblock = cleft->rc_startblock = NULLAGBLOCK; 54331727258SDarrick J. Wong error = xfs_refcount_lookup_le(cur, agbno - 1, &found_rec); 54431727258SDarrick J. Wong if (error) 54531727258SDarrick J. Wong goto out_error; 54631727258SDarrick J. Wong if (!found_rec) 54731727258SDarrick J. Wong return 0; 54831727258SDarrick J. Wong 54931727258SDarrick J. Wong error = xfs_refcount_get_rec(cur, &tmp, &found_rec); 55031727258SDarrick J. Wong if (error) 55131727258SDarrick J. Wong goto out_error; 55231727258SDarrick J. Wong XFS_WANT_CORRUPTED_GOTO(cur->bc_mp, found_rec == 1, out_error); 55331727258SDarrick J. Wong 55431727258SDarrick J. Wong if (xfs_refc_next(&tmp) != agbno) 55531727258SDarrick J. Wong return 0; 556174edb0eSDarrick J. Wong if ((flags & XFS_FIND_RCEXT_SHARED) && tmp.rc_refcount < 2) 557174edb0eSDarrick J. Wong return 0; 558174edb0eSDarrick J. Wong if ((flags & XFS_FIND_RCEXT_COW) && tmp.rc_refcount > 1) 559174edb0eSDarrick J. Wong return 0; 56031727258SDarrick J. Wong /* We have a left extent; retrieve (or invent) the next right one */ 56131727258SDarrick J. Wong *left = tmp; 56231727258SDarrick J. Wong 56331727258SDarrick J. Wong error = xfs_btree_increment(cur, 0, &found_rec); 56431727258SDarrick J. Wong if (error) 56531727258SDarrick J. Wong goto out_error; 56631727258SDarrick J. Wong if (found_rec) { 56731727258SDarrick J. Wong error = xfs_refcount_get_rec(cur, &tmp, &found_rec); 56831727258SDarrick J. Wong if (error) 56931727258SDarrick J. Wong goto out_error; 57031727258SDarrick J. Wong XFS_WANT_CORRUPTED_GOTO(cur->bc_mp, found_rec == 1, 57131727258SDarrick J. Wong out_error); 57231727258SDarrick J. Wong 57331727258SDarrick J. Wong /* if tmp starts at the end of our range, just use that */ 57431727258SDarrick J. Wong if (tmp.rc_startblock == agbno) 57531727258SDarrick J. Wong *cleft = tmp; 57631727258SDarrick J. Wong else { 57731727258SDarrick J. Wong /* 57831727258SDarrick J. Wong * There's a gap in the refcntbt at the start of the 57931727258SDarrick J. Wong * range we're interested in (refcount == 1) so 58031727258SDarrick J. Wong * synthesize the implied extent and pass it back. 58131727258SDarrick J. Wong * We assume here that the agbno/aglen range was 58231727258SDarrick J. Wong * passed in from a data fork extent mapping and 58331727258SDarrick J. Wong * therefore is allocated to exactly one owner. 58431727258SDarrick J. Wong */ 58531727258SDarrick J. Wong cleft->rc_startblock = agbno; 58631727258SDarrick J. Wong cleft->rc_blockcount = min(aglen, 58731727258SDarrick J. Wong tmp.rc_startblock - agbno); 58831727258SDarrick J. Wong cleft->rc_refcount = 1; 58931727258SDarrick J. Wong } 59031727258SDarrick J. Wong } else { 59131727258SDarrick J. Wong /* 59231727258SDarrick J. Wong * No extents, so pretend that there's one covering the whole 59331727258SDarrick J. Wong * range. 59431727258SDarrick J. Wong */ 59531727258SDarrick J. Wong cleft->rc_startblock = agbno; 59631727258SDarrick J. Wong cleft->rc_blockcount = aglen; 59731727258SDarrick J. Wong cleft->rc_refcount = 1; 59831727258SDarrick J. Wong } 59931727258SDarrick J. Wong trace_xfs_refcount_find_left_extent(cur->bc_mp, cur->bc_private.a.agno, 60031727258SDarrick J. Wong left, cleft, agbno); 60131727258SDarrick J. Wong return error; 60231727258SDarrick J. Wong 60331727258SDarrick J. Wong out_error: 60431727258SDarrick J. Wong trace_xfs_refcount_find_left_extent_error(cur->bc_mp, 60531727258SDarrick J. Wong cur->bc_private.a.agno, error, _RET_IP_); 60631727258SDarrick J. Wong return error; 60731727258SDarrick J. Wong } 60831727258SDarrick J. Wong 60931727258SDarrick J. Wong /* 61031727258SDarrick J. Wong * Find the right extent and the one before it (cright). This function 61131727258SDarrick J. Wong * assumes that we've already split any extents crossing agbno + aglen. 61231727258SDarrick J. Wong */ 61331727258SDarrick J. Wong STATIC int 61431727258SDarrick J. Wong xfs_refcount_find_right_extents( 61531727258SDarrick J. Wong struct xfs_btree_cur *cur, 61631727258SDarrick J. Wong struct xfs_refcount_irec *right, 61731727258SDarrick J. Wong struct xfs_refcount_irec *cright, 61831727258SDarrick J. Wong xfs_agblock_t agbno, 619174edb0eSDarrick J. Wong xfs_extlen_t aglen, 620174edb0eSDarrick J. Wong int flags) 62131727258SDarrick J. Wong { 62231727258SDarrick J. Wong struct xfs_refcount_irec tmp; 62331727258SDarrick J. Wong int error; 62431727258SDarrick J. Wong int found_rec; 62531727258SDarrick J. Wong 62631727258SDarrick J. Wong right->rc_startblock = cright->rc_startblock = NULLAGBLOCK; 62731727258SDarrick J. Wong error = xfs_refcount_lookup_ge(cur, agbno + aglen, &found_rec); 62831727258SDarrick J. Wong if (error) 62931727258SDarrick J. Wong goto out_error; 63031727258SDarrick J. Wong if (!found_rec) 63131727258SDarrick J. Wong return 0; 63231727258SDarrick J. Wong 63331727258SDarrick J. Wong error = xfs_refcount_get_rec(cur, &tmp, &found_rec); 63431727258SDarrick J. Wong if (error) 63531727258SDarrick J. Wong goto out_error; 63631727258SDarrick J. Wong XFS_WANT_CORRUPTED_GOTO(cur->bc_mp, found_rec == 1, out_error); 63731727258SDarrick J. Wong 63831727258SDarrick J. Wong if (tmp.rc_startblock != agbno + aglen) 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 right extent; retrieve (or invent) the next left one */ 64531727258SDarrick J. Wong *right = tmp; 64631727258SDarrick J. Wong 64731727258SDarrick J. Wong error = xfs_btree_decrement(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; 65431727258SDarrick J. Wong XFS_WANT_CORRUPTED_GOTO(cur->bc_mp, found_rec == 1, 65531727258SDarrick J. Wong out_error); 65631727258SDarrick J. Wong 65731727258SDarrick J. Wong /* if tmp ends at the end of our range, just use that */ 65831727258SDarrick J. Wong if (xfs_refc_next(&tmp) == agbno + aglen) 65931727258SDarrick J. Wong *cright = tmp; 66031727258SDarrick J. Wong else { 66131727258SDarrick J. Wong /* 66231727258SDarrick J. Wong * There's a gap in the refcntbt at the end of the 66331727258SDarrick J. Wong * range we're interested in (refcount == 1) so 66431727258SDarrick J. Wong * create the implied extent and pass it back. 66531727258SDarrick J. Wong * We assume here that the agbno/aglen range was 66631727258SDarrick J. Wong * passed in from a data fork extent mapping and 66731727258SDarrick J. Wong * therefore is allocated to exactly one owner. 66831727258SDarrick J. Wong */ 66931727258SDarrick J. Wong cright->rc_startblock = max(agbno, xfs_refc_next(&tmp)); 67031727258SDarrick J. Wong cright->rc_blockcount = right->rc_startblock - 67131727258SDarrick J. Wong cright->rc_startblock; 67231727258SDarrick J. Wong cright->rc_refcount = 1; 67331727258SDarrick J. Wong } 67431727258SDarrick J. Wong } else { 67531727258SDarrick J. Wong /* 67631727258SDarrick J. Wong * No extents, so pretend that there's one covering the whole 67731727258SDarrick J. Wong * range. 67831727258SDarrick J. Wong */ 67931727258SDarrick J. Wong cright->rc_startblock = agbno; 68031727258SDarrick J. Wong cright->rc_blockcount = aglen; 68131727258SDarrick J. Wong cright->rc_refcount = 1; 68231727258SDarrick J. Wong } 68331727258SDarrick J. Wong trace_xfs_refcount_find_right_extent(cur->bc_mp, cur->bc_private.a.agno, 68431727258SDarrick J. Wong cright, right, agbno + aglen); 68531727258SDarrick J. Wong return error; 68631727258SDarrick J. Wong 68731727258SDarrick J. Wong out_error: 68831727258SDarrick J. Wong trace_xfs_refcount_find_right_extent_error(cur->bc_mp, 68931727258SDarrick J. Wong cur->bc_private.a.agno, error, _RET_IP_); 69031727258SDarrick J. Wong return error; 69131727258SDarrick J. Wong } 69231727258SDarrick J. Wong 69331727258SDarrick J. Wong /* Is this extent valid? */ 69431727258SDarrick J. Wong static inline bool 69531727258SDarrick J. Wong xfs_refc_valid( 69631727258SDarrick J. Wong struct xfs_refcount_irec *rc) 69731727258SDarrick J. Wong { 69831727258SDarrick J. Wong return rc->rc_startblock != NULLAGBLOCK; 69931727258SDarrick J. Wong } 70031727258SDarrick J. Wong 70131727258SDarrick J. Wong /* 70231727258SDarrick J. Wong * Try to merge with any extents on the boundaries of the adjustment range. 70331727258SDarrick J. Wong */ 70431727258SDarrick J. Wong STATIC int 70531727258SDarrick J. Wong xfs_refcount_merge_extents( 70631727258SDarrick J. Wong struct xfs_btree_cur *cur, 70731727258SDarrick J. Wong xfs_agblock_t *agbno, 70831727258SDarrick J. Wong xfs_extlen_t *aglen, 70931727258SDarrick J. Wong enum xfs_refc_adjust_op adjust, 710174edb0eSDarrick J. Wong int flags, 71131727258SDarrick J. Wong bool *shape_changed) 71231727258SDarrick J. Wong { 71331727258SDarrick J. Wong struct xfs_refcount_irec left = {0}, cleft = {0}; 71431727258SDarrick J. Wong struct xfs_refcount_irec cright = {0}, right = {0}; 71531727258SDarrick J. Wong int error; 71631727258SDarrick J. Wong unsigned long long ulen; 71731727258SDarrick J. Wong bool cequal; 71831727258SDarrick J. Wong 71931727258SDarrick J. Wong *shape_changed = false; 72031727258SDarrick J. Wong /* 72131727258SDarrick J. Wong * Find the extent just below agbno [left], just above agbno [cleft], 72231727258SDarrick J. Wong * just below (agbno + aglen) [cright], and just above (agbno + aglen) 72331727258SDarrick J. Wong * [right]. 72431727258SDarrick J. Wong */ 72531727258SDarrick J. Wong error = xfs_refcount_find_left_extents(cur, &left, &cleft, *agbno, 726174edb0eSDarrick J. Wong *aglen, flags); 72731727258SDarrick J. Wong if (error) 72831727258SDarrick J. Wong return error; 72931727258SDarrick J. Wong error = xfs_refcount_find_right_extents(cur, &right, &cright, *agbno, 730174edb0eSDarrick J. Wong *aglen, flags); 73131727258SDarrick J. Wong if (error) 73231727258SDarrick J. Wong return error; 73331727258SDarrick J. Wong 73431727258SDarrick J. Wong /* No left or right extent to merge; exit. */ 73531727258SDarrick J. Wong if (!xfs_refc_valid(&left) && !xfs_refc_valid(&right)) 73631727258SDarrick J. Wong return 0; 73731727258SDarrick J. Wong 73831727258SDarrick J. Wong cequal = (cleft.rc_startblock == cright.rc_startblock) && 73931727258SDarrick J. Wong (cleft.rc_blockcount == cright.rc_blockcount); 74031727258SDarrick J. Wong 74131727258SDarrick J. Wong /* Try to merge left, cleft, and right. cleft must == cright. */ 74231727258SDarrick J. Wong ulen = (unsigned long long)left.rc_blockcount + cleft.rc_blockcount + 74331727258SDarrick J. Wong right.rc_blockcount; 74431727258SDarrick J. Wong if (xfs_refc_valid(&left) && xfs_refc_valid(&right) && 74531727258SDarrick J. Wong xfs_refc_valid(&cleft) && xfs_refc_valid(&cright) && cequal && 74631727258SDarrick J. Wong left.rc_refcount == cleft.rc_refcount + adjust && 74731727258SDarrick J. Wong right.rc_refcount == cleft.rc_refcount + adjust && 74831727258SDarrick J. Wong ulen < MAXREFCEXTLEN) { 74931727258SDarrick J. Wong *shape_changed = true; 75031727258SDarrick J. Wong return xfs_refcount_merge_center_extents(cur, &left, &cleft, 75131727258SDarrick J. Wong &right, ulen, agbno, aglen); 75231727258SDarrick J. Wong } 75331727258SDarrick J. Wong 75431727258SDarrick J. Wong /* Try to merge left and cleft. */ 75531727258SDarrick J. Wong ulen = (unsigned long long)left.rc_blockcount + cleft.rc_blockcount; 75631727258SDarrick J. Wong if (xfs_refc_valid(&left) && xfs_refc_valid(&cleft) && 75731727258SDarrick J. Wong left.rc_refcount == cleft.rc_refcount + adjust && 75831727258SDarrick J. Wong ulen < MAXREFCEXTLEN) { 75931727258SDarrick J. Wong *shape_changed = true; 76031727258SDarrick J. Wong error = xfs_refcount_merge_left_extent(cur, &left, &cleft, 76131727258SDarrick J. Wong agbno, aglen); 76231727258SDarrick J. Wong if (error) 76331727258SDarrick J. Wong return error; 76431727258SDarrick J. Wong 76531727258SDarrick J. Wong /* 76631727258SDarrick J. Wong * If we just merged left + cleft and cleft == cright, 76731727258SDarrick J. Wong * we no longer have a cright to merge with right. We're done. 76831727258SDarrick J. Wong */ 76931727258SDarrick J. Wong if (cequal) 77031727258SDarrick J. Wong return 0; 77131727258SDarrick J. Wong } 77231727258SDarrick J. Wong 77331727258SDarrick J. Wong /* Try to merge cright and right. */ 77431727258SDarrick J. Wong ulen = (unsigned long long)right.rc_blockcount + cright.rc_blockcount; 77531727258SDarrick J. Wong if (xfs_refc_valid(&right) && xfs_refc_valid(&cright) && 77631727258SDarrick J. Wong right.rc_refcount == cright.rc_refcount + adjust && 77731727258SDarrick J. Wong ulen < MAXREFCEXTLEN) { 77831727258SDarrick J. Wong *shape_changed = true; 77931727258SDarrick J. Wong return xfs_refcount_merge_right_extent(cur, &right, &cright, 78031727258SDarrick J. Wong agbno, aglen); 78131727258SDarrick J. Wong } 78231727258SDarrick J. Wong 78331727258SDarrick J. Wong return error; 78431727258SDarrick J. Wong } 78531727258SDarrick J. Wong 78631727258SDarrick J. Wong /* 78731727258SDarrick J. Wong * While we're adjusting the refcounts records of an extent, we have 78831727258SDarrick J. Wong * to keep an eye on the number of extents we're dirtying -- run too 78931727258SDarrick J. Wong * many in a single transaction and we'll exceed the transaction's 79031727258SDarrick J. Wong * reservation and crash the fs. Each record adds 12 bytes to the 79131727258SDarrick J. Wong * log (plus any key updates) so we'll conservatively assume 24 bytes 79231727258SDarrick J. Wong * per record. We must also leave space for btree splits on both ends 79331727258SDarrick J. Wong * of the range and space for the CUD and a new CUI. 79431727258SDarrick J. Wong * 79531727258SDarrick J. Wong * XXX: This is a pretty hand-wavy estimate. The penalty for guessing 79631727258SDarrick J. Wong * true incorrectly is a shutdown FS; the penalty for guessing false 79731727258SDarrick J. Wong * incorrectly is more transaction rolls than might be necessary. 79831727258SDarrick J. Wong * Be conservative here. 79931727258SDarrick J. Wong */ 80031727258SDarrick J. Wong static bool 80131727258SDarrick J. Wong xfs_refcount_still_have_space( 80231727258SDarrick J. Wong struct xfs_btree_cur *cur) 80331727258SDarrick J. Wong { 80431727258SDarrick J. Wong unsigned long overhead; 80531727258SDarrick J. Wong 80631727258SDarrick J. Wong overhead = cur->bc_private.a.priv.refc.shape_changes * 80731727258SDarrick J. Wong xfs_allocfree_log_count(cur->bc_mp, 1); 80831727258SDarrick J. Wong overhead *= cur->bc_mp->m_sb.sb_blocksize; 80931727258SDarrick J. Wong 81031727258SDarrick J. Wong /* 81131727258SDarrick J. Wong * Only allow 2 refcount extent updates per transaction if the 81231727258SDarrick J. Wong * refcount continue update "error" has been injected. 81331727258SDarrick J. Wong */ 81431727258SDarrick J. Wong if (cur->bc_private.a.priv.refc.nr_ops > 2 && 81531727258SDarrick J. Wong XFS_TEST_ERROR(false, cur->bc_mp, 81631727258SDarrick J. Wong XFS_ERRTAG_REFCOUNT_CONTINUE_UPDATE, 81731727258SDarrick J. Wong XFS_RANDOM_REFCOUNT_CONTINUE_UPDATE)) 81831727258SDarrick J. Wong return false; 81931727258SDarrick J. Wong 82031727258SDarrick J. Wong if (cur->bc_private.a.priv.refc.nr_ops == 0) 82131727258SDarrick J. Wong return true; 82231727258SDarrick J. Wong else if (overhead > cur->bc_tp->t_log_res) 82331727258SDarrick J. Wong return false; 82431727258SDarrick J. Wong return cur->bc_tp->t_log_res - overhead > 82531727258SDarrick J. Wong cur->bc_private.a.priv.refc.nr_ops * 32; 82631727258SDarrick J. Wong } 82731727258SDarrick J. Wong 82831727258SDarrick J. Wong /* 82931727258SDarrick J. Wong * Adjust the refcounts of middle extents. At this point we should have 83031727258SDarrick J. Wong * split extents that crossed the adjustment range; merged with adjacent 83131727258SDarrick J. Wong * extents; and updated agbno/aglen to reflect the merges. Therefore, 83231727258SDarrick J. Wong * all we have to do is update the extents inside [agbno, agbno + aglen]. 83331727258SDarrick J. Wong */ 83431727258SDarrick J. Wong STATIC int 83531727258SDarrick J. Wong xfs_refcount_adjust_extents( 83631727258SDarrick J. Wong struct xfs_btree_cur *cur, 83731727258SDarrick J. Wong xfs_agblock_t *agbno, 83831727258SDarrick J. Wong xfs_extlen_t *aglen, 83931727258SDarrick J. Wong enum xfs_refc_adjust_op adj, 84031727258SDarrick J. Wong struct xfs_defer_ops *dfops, 84131727258SDarrick J. Wong struct xfs_owner_info *oinfo) 84231727258SDarrick J. Wong { 84331727258SDarrick J. Wong struct xfs_refcount_irec ext, tmp; 84431727258SDarrick J. Wong int error; 84531727258SDarrick J. Wong int found_rec, found_tmp; 84631727258SDarrick J. Wong xfs_fsblock_t fsbno; 84731727258SDarrick J. Wong 84831727258SDarrick J. Wong /* Merging did all the work already. */ 84931727258SDarrick J. Wong if (*aglen == 0) 85031727258SDarrick J. Wong return 0; 85131727258SDarrick J. Wong 85231727258SDarrick J. Wong error = xfs_refcount_lookup_ge(cur, *agbno, &found_rec); 85331727258SDarrick J. Wong if (error) 85431727258SDarrick J. Wong goto out_error; 85531727258SDarrick J. Wong 85631727258SDarrick J. Wong while (*aglen > 0 && xfs_refcount_still_have_space(cur)) { 85731727258SDarrick J. Wong error = xfs_refcount_get_rec(cur, &ext, &found_rec); 85831727258SDarrick J. Wong if (error) 85931727258SDarrick J. Wong goto out_error; 86031727258SDarrick J. Wong if (!found_rec) { 86131727258SDarrick J. Wong ext.rc_startblock = cur->bc_mp->m_sb.sb_agblocks; 86231727258SDarrick J. Wong ext.rc_blockcount = 0; 86331727258SDarrick J. Wong ext.rc_refcount = 0; 86431727258SDarrick J. Wong } 86531727258SDarrick J. Wong 86631727258SDarrick J. Wong /* 86731727258SDarrick J. Wong * Deal with a hole in the refcount tree; if a file maps to 86831727258SDarrick J. Wong * these blocks and there's no refcountbt record, pretend that 86931727258SDarrick J. Wong * there is one with refcount == 1. 87031727258SDarrick J. Wong */ 87131727258SDarrick J. Wong if (ext.rc_startblock != *agbno) { 87231727258SDarrick J. Wong tmp.rc_startblock = *agbno; 87331727258SDarrick J. Wong tmp.rc_blockcount = min(*aglen, 87431727258SDarrick J. Wong ext.rc_startblock - *agbno); 87531727258SDarrick J. Wong tmp.rc_refcount = 1 + adj; 87631727258SDarrick J. Wong trace_xfs_refcount_modify_extent(cur->bc_mp, 87731727258SDarrick J. Wong cur->bc_private.a.agno, &tmp); 87831727258SDarrick J. Wong 87931727258SDarrick J. Wong /* 88031727258SDarrick J. Wong * Either cover the hole (increment) or 88131727258SDarrick J. Wong * delete the range (decrement). 88231727258SDarrick J. Wong */ 88331727258SDarrick J. Wong if (tmp.rc_refcount) { 88431727258SDarrick J. Wong error = xfs_refcount_insert(cur, &tmp, 88531727258SDarrick J. Wong &found_tmp); 88631727258SDarrick J. Wong if (error) 88731727258SDarrick J. Wong goto out_error; 88831727258SDarrick J. Wong XFS_WANT_CORRUPTED_GOTO(cur->bc_mp, 88931727258SDarrick J. Wong found_tmp == 1, out_error); 89031727258SDarrick J. Wong cur->bc_private.a.priv.refc.nr_ops++; 89131727258SDarrick J. Wong } else { 89231727258SDarrick J. Wong fsbno = XFS_AGB_TO_FSB(cur->bc_mp, 89331727258SDarrick J. Wong cur->bc_private.a.agno, 89431727258SDarrick J. Wong tmp.rc_startblock); 89531727258SDarrick J. Wong xfs_bmap_add_free(cur->bc_mp, dfops, fsbno, 89631727258SDarrick J. Wong tmp.rc_blockcount, oinfo); 89731727258SDarrick J. Wong } 89831727258SDarrick J. Wong 89931727258SDarrick J. Wong (*agbno) += tmp.rc_blockcount; 90031727258SDarrick J. Wong (*aglen) -= tmp.rc_blockcount; 90131727258SDarrick J. Wong 90231727258SDarrick J. Wong error = xfs_refcount_lookup_ge(cur, *agbno, 90331727258SDarrick J. Wong &found_rec); 90431727258SDarrick J. Wong if (error) 90531727258SDarrick J. Wong goto out_error; 90631727258SDarrick J. Wong } 90731727258SDarrick J. Wong 90831727258SDarrick J. Wong /* Stop if there's nothing left to modify */ 90931727258SDarrick J. Wong if (*aglen == 0 || !xfs_refcount_still_have_space(cur)) 91031727258SDarrick J. Wong break; 91131727258SDarrick J. Wong 91231727258SDarrick J. Wong /* 91331727258SDarrick J. Wong * Adjust the reference count and either update the tree 91431727258SDarrick J. Wong * (incr) or free the blocks (decr). 91531727258SDarrick J. Wong */ 91631727258SDarrick J. Wong if (ext.rc_refcount == MAXREFCOUNT) 91731727258SDarrick J. Wong goto skip; 91831727258SDarrick J. Wong ext.rc_refcount += adj; 91931727258SDarrick J. Wong trace_xfs_refcount_modify_extent(cur->bc_mp, 92031727258SDarrick J. Wong cur->bc_private.a.agno, &ext); 92131727258SDarrick J. Wong if (ext.rc_refcount > 1) { 92231727258SDarrick J. Wong error = xfs_refcount_update(cur, &ext); 92331727258SDarrick J. Wong if (error) 92431727258SDarrick J. Wong goto out_error; 92531727258SDarrick J. Wong cur->bc_private.a.priv.refc.nr_ops++; 92631727258SDarrick J. Wong } else if (ext.rc_refcount == 1) { 92731727258SDarrick J. Wong error = xfs_refcount_delete(cur, &found_rec); 92831727258SDarrick J. Wong if (error) 92931727258SDarrick J. Wong goto out_error; 93031727258SDarrick J. Wong XFS_WANT_CORRUPTED_GOTO(cur->bc_mp, 93131727258SDarrick J. Wong found_rec == 1, out_error); 93231727258SDarrick J. Wong cur->bc_private.a.priv.refc.nr_ops++; 93331727258SDarrick J. Wong goto advloop; 93431727258SDarrick J. Wong } else { 93531727258SDarrick J. Wong fsbno = XFS_AGB_TO_FSB(cur->bc_mp, 93631727258SDarrick J. Wong cur->bc_private.a.agno, 93731727258SDarrick J. Wong ext.rc_startblock); 93831727258SDarrick J. Wong xfs_bmap_add_free(cur->bc_mp, dfops, fsbno, 93931727258SDarrick J. Wong ext.rc_blockcount, oinfo); 94031727258SDarrick J. Wong } 94131727258SDarrick J. Wong 94231727258SDarrick J. Wong skip: 94331727258SDarrick J. Wong error = xfs_btree_increment(cur, 0, &found_rec); 94431727258SDarrick J. Wong if (error) 94531727258SDarrick J. Wong goto out_error; 94631727258SDarrick J. Wong 94731727258SDarrick J. Wong advloop: 94831727258SDarrick J. Wong (*agbno) += ext.rc_blockcount; 94931727258SDarrick J. Wong (*aglen) -= ext.rc_blockcount; 95031727258SDarrick J. Wong } 95131727258SDarrick J. Wong 95231727258SDarrick J. Wong return error; 95331727258SDarrick J. Wong out_error: 95431727258SDarrick J. Wong trace_xfs_refcount_modify_extent_error(cur->bc_mp, 95531727258SDarrick J. Wong cur->bc_private.a.agno, error, _RET_IP_); 95631727258SDarrick J. Wong return error; 95731727258SDarrick J. Wong } 95831727258SDarrick J. Wong 95931727258SDarrick J. Wong /* Adjust the reference count of a range of AG blocks. */ 96031727258SDarrick J. Wong STATIC int 96131727258SDarrick J. Wong xfs_refcount_adjust( 96231727258SDarrick J. Wong struct xfs_btree_cur *cur, 96331727258SDarrick J. Wong xfs_agblock_t agbno, 96431727258SDarrick J. Wong xfs_extlen_t aglen, 96531727258SDarrick J. Wong xfs_agblock_t *new_agbno, 96631727258SDarrick J. Wong xfs_extlen_t *new_aglen, 96731727258SDarrick J. Wong enum xfs_refc_adjust_op adj, 96831727258SDarrick J. Wong struct xfs_defer_ops *dfops, 96931727258SDarrick J. Wong struct xfs_owner_info *oinfo) 97031727258SDarrick J. Wong { 97131727258SDarrick J. Wong bool shape_changed; 97231727258SDarrick J. Wong int shape_changes = 0; 97331727258SDarrick J. Wong int error; 97431727258SDarrick J. Wong 97531727258SDarrick J. Wong *new_agbno = agbno; 97631727258SDarrick J. Wong *new_aglen = aglen; 97731727258SDarrick J. Wong if (adj == XFS_REFCOUNT_ADJUST_INCREASE) 97831727258SDarrick J. Wong trace_xfs_refcount_increase(cur->bc_mp, cur->bc_private.a.agno, 97931727258SDarrick J. Wong agbno, aglen); 98031727258SDarrick J. Wong else 98131727258SDarrick J. Wong trace_xfs_refcount_decrease(cur->bc_mp, cur->bc_private.a.agno, 98231727258SDarrick J. Wong agbno, aglen); 98331727258SDarrick J. Wong 98431727258SDarrick J. Wong /* 98531727258SDarrick J. Wong * Ensure that no rcextents cross the boundary of the adjustment range. 98631727258SDarrick J. Wong */ 98731727258SDarrick J. Wong error = xfs_refcount_split_extent(cur, agbno, &shape_changed); 98831727258SDarrick J. Wong if (error) 98931727258SDarrick J. Wong goto out_error; 99031727258SDarrick J. Wong if (shape_changed) 99131727258SDarrick J. Wong shape_changes++; 99231727258SDarrick J. Wong 99331727258SDarrick J. Wong error = xfs_refcount_split_extent(cur, agbno + aglen, &shape_changed); 99431727258SDarrick J. Wong if (error) 99531727258SDarrick J. Wong goto out_error; 99631727258SDarrick J. Wong if (shape_changed) 99731727258SDarrick J. Wong shape_changes++; 99831727258SDarrick J. Wong 99931727258SDarrick J. Wong /* 100031727258SDarrick J. Wong * Try to merge with the left or right extents of the range. 100131727258SDarrick J. Wong */ 100231727258SDarrick J. Wong error = xfs_refcount_merge_extents(cur, new_agbno, new_aglen, adj, 1003174edb0eSDarrick J. Wong XFS_FIND_RCEXT_SHARED, &shape_changed); 100431727258SDarrick J. Wong if (error) 100531727258SDarrick J. Wong goto out_error; 100631727258SDarrick J. Wong if (shape_changed) 100731727258SDarrick J. Wong shape_changes++; 100831727258SDarrick J. Wong if (shape_changes) 100931727258SDarrick J. Wong cur->bc_private.a.priv.refc.shape_changes++; 101031727258SDarrick J. Wong 101131727258SDarrick J. Wong /* Now that we've taken care of the ends, adjust the middle extents */ 101231727258SDarrick J. Wong error = xfs_refcount_adjust_extents(cur, new_agbno, new_aglen, 101331727258SDarrick J. Wong adj, dfops, oinfo); 101431727258SDarrick J. Wong if (error) 101531727258SDarrick J. Wong goto out_error; 101631727258SDarrick J. Wong 101731727258SDarrick J. Wong return 0; 101831727258SDarrick J. Wong 101931727258SDarrick J. Wong out_error: 102031727258SDarrick J. Wong trace_xfs_refcount_adjust_error(cur->bc_mp, cur->bc_private.a.agno, 102131727258SDarrick J. Wong error, _RET_IP_); 102231727258SDarrick J. Wong return error; 102331727258SDarrick J. Wong } 102433ba6129SDarrick J. Wong 102533ba6129SDarrick J. Wong /* Clean up after calling xfs_refcount_finish_one. */ 102633ba6129SDarrick J. Wong void 102733ba6129SDarrick J. Wong xfs_refcount_finish_one_cleanup( 102833ba6129SDarrick J. Wong struct xfs_trans *tp, 102933ba6129SDarrick J. Wong struct xfs_btree_cur *rcur, 103033ba6129SDarrick J. Wong int error) 103133ba6129SDarrick J. Wong { 103233ba6129SDarrick J. Wong struct xfs_buf *agbp; 103333ba6129SDarrick J. Wong 103433ba6129SDarrick J. Wong if (rcur == NULL) 103533ba6129SDarrick J. Wong return; 103633ba6129SDarrick J. Wong agbp = rcur->bc_private.a.agbp; 103733ba6129SDarrick J. Wong xfs_btree_del_cursor(rcur, error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR); 103833ba6129SDarrick J. Wong if (error) 103933ba6129SDarrick J. Wong xfs_trans_brelse(tp, agbp); 104033ba6129SDarrick J. Wong } 104133ba6129SDarrick J. Wong 104233ba6129SDarrick J. Wong /* 104333ba6129SDarrick J. Wong * Process one of the deferred refcount operations. We pass back the 104433ba6129SDarrick J. Wong * btree cursor to maintain our lock on the btree between calls. 104533ba6129SDarrick J. Wong * This saves time and eliminates a buffer deadlock between the 104633ba6129SDarrick J. Wong * superblock and the AGF because we'll always grab them in the same 104733ba6129SDarrick J. Wong * order. 104833ba6129SDarrick J. Wong */ 104933ba6129SDarrick J. Wong int 105033ba6129SDarrick J. Wong xfs_refcount_finish_one( 105133ba6129SDarrick J. Wong struct xfs_trans *tp, 105233ba6129SDarrick J. Wong struct xfs_defer_ops *dfops, 105333ba6129SDarrick J. Wong enum xfs_refcount_intent_type type, 105433ba6129SDarrick J. Wong xfs_fsblock_t startblock, 105533ba6129SDarrick J. Wong xfs_extlen_t blockcount, 105633ba6129SDarrick J. Wong xfs_fsblock_t *new_fsb, 105733ba6129SDarrick J. Wong xfs_extlen_t *new_len, 105833ba6129SDarrick J. Wong struct xfs_btree_cur **pcur) 105933ba6129SDarrick J. Wong { 106033ba6129SDarrick J. Wong struct xfs_mount *mp = tp->t_mountp; 106133ba6129SDarrick J. Wong struct xfs_btree_cur *rcur; 106233ba6129SDarrick J. Wong struct xfs_buf *agbp = NULL; 106333ba6129SDarrick J. Wong int error = 0; 106433ba6129SDarrick J. Wong xfs_agnumber_t agno; 106533ba6129SDarrick J. Wong xfs_agblock_t bno; 106633ba6129SDarrick J. Wong xfs_agblock_t new_agbno; 106733ba6129SDarrick J. Wong unsigned long nr_ops = 0; 106833ba6129SDarrick J. Wong int shape_changes = 0; 106933ba6129SDarrick J. Wong 107033ba6129SDarrick J. Wong agno = XFS_FSB_TO_AGNO(mp, startblock); 107133ba6129SDarrick J. Wong ASSERT(agno != NULLAGNUMBER); 107233ba6129SDarrick J. Wong bno = XFS_FSB_TO_AGBNO(mp, startblock); 107333ba6129SDarrick J. Wong 107433ba6129SDarrick J. Wong trace_xfs_refcount_deferred(mp, XFS_FSB_TO_AGNO(mp, startblock), 107533ba6129SDarrick J. Wong type, XFS_FSB_TO_AGBNO(mp, startblock), 107633ba6129SDarrick J. Wong blockcount); 107733ba6129SDarrick J. Wong 107833ba6129SDarrick J. Wong if (XFS_TEST_ERROR(false, mp, 107933ba6129SDarrick J. Wong XFS_ERRTAG_REFCOUNT_FINISH_ONE, 108033ba6129SDarrick J. Wong XFS_RANDOM_REFCOUNT_FINISH_ONE)) 108133ba6129SDarrick J. Wong return -EIO; 108233ba6129SDarrick J. Wong 108333ba6129SDarrick J. Wong /* 108433ba6129SDarrick J. Wong * If we haven't gotten a cursor or the cursor AG doesn't match 108533ba6129SDarrick J. Wong * the startblock, get one now. 108633ba6129SDarrick J. Wong */ 108733ba6129SDarrick J. Wong rcur = *pcur; 108833ba6129SDarrick J. Wong if (rcur != NULL && rcur->bc_private.a.agno != agno) { 108933ba6129SDarrick J. Wong nr_ops = rcur->bc_private.a.priv.refc.nr_ops; 109033ba6129SDarrick J. Wong shape_changes = rcur->bc_private.a.priv.refc.shape_changes; 109133ba6129SDarrick J. Wong xfs_refcount_finish_one_cleanup(tp, rcur, 0); 109233ba6129SDarrick J. Wong rcur = NULL; 109333ba6129SDarrick J. Wong *pcur = NULL; 109433ba6129SDarrick J. Wong } 109533ba6129SDarrick J. Wong if (rcur == NULL) { 109633ba6129SDarrick J. Wong error = xfs_alloc_read_agf(tp->t_mountp, tp, agno, 109733ba6129SDarrick J. Wong XFS_ALLOC_FLAG_FREEING, &agbp); 109833ba6129SDarrick J. Wong if (error) 109933ba6129SDarrick J. Wong return error; 110033ba6129SDarrick J. Wong if (!agbp) 110133ba6129SDarrick J. Wong return -EFSCORRUPTED; 110233ba6129SDarrick J. Wong 110333ba6129SDarrick J. Wong rcur = xfs_refcountbt_init_cursor(mp, tp, agbp, agno, dfops); 110433ba6129SDarrick J. Wong if (!rcur) { 110533ba6129SDarrick J. Wong error = -ENOMEM; 110633ba6129SDarrick J. Wong goto out_cur; 110733ba6129SDarrick J. Wong } 110833ba6129SDarrick J. Wong rcur->bc_private.a.priv.refc.nr_ops = nr_ops; 110933ba6129SDarrick J. Wong rcur->bc_private.a.priv.refc.shape_changes = shape_changes; 111033ba6129SDarrick J. Wong } 111133ba6129SDarrick J. Wong *pcur = rcur; 111233ba6129SDarrick J. Wong 111333ba6129SDarrick J. Wong switch (type) { 111433ba6129SDarrick J. Wong case XFS_REFCOUNT_INCREASE: 111533ba6129SDarrick J. Wong error = xfs_refcount_adjust(rcur, bno, blockcount, &new_agbno, 111633ba6129SDarrick J. Wong new_len, XFS_REFCOUNT_ADJUST_INCREASE, dfops, NULL); 111733ba6129SDarrick J. Wong *new_fsb = XFS_AGB_TO_FSB(mp, agno, new_agbno); 111833ba6129SDarrick J. Wong break; 111933ba6129SDarrick J. Wong case XFS_REFCOUNT_DECREASE: 112033ba6129SDarrick J. Wong error = xfs_refcount_adjust(rcur, bno, blockcount, &new_agbno, 112133ba6129SDarrick J. Wong new_len, XFS_REFCOUNT_ADJUST_DECREASE, dfops, NULL); 112233ba6129SDarrick J. Wong *new_fsb = XFS_AGB_TO_FSB(mp, agno, new_agbno); 112333ba6129SDarrick J. Wong break; 1124174edb0eSDarrick J. Wong case XFS_REFCOUNT_ALLOC_COW: 1125174edb0eSDarrick J. Wong *new_fsb = startblock + blockcount; 1126174edb0eSDarrick J. Wong *new_len = 0; 1127174edb0eSDarrick J. Wong error = __xfs_refcount_cow_alloc(rcur, bno, blockcount, dfops); 1128174edb0eSDarrick J. Wong break; 1129174edb0eSDarrick J. Wong case XFS_REFCOUNT_FREE_COW: 1130174edb0eSDarrick J. Wong *new_fsb = startblock + blockcount; 1131174edb0eSDarrick J. Wong *new_len = 0; 1132174edb0eSDarrick J. Wong error = __xfs_refcount_cow_free(rcur, bno, blockcount, dfops); 1133174edb0eSDarrick J. Wong break; 113433ba6129SDarrick J. Wong default: 113533ba6129SDarrick J. Wong ASSERT(0); 113633ba6129SDarrick J. Wong error = -EFSCORRUPTED; 113733ba6129SDarrick J. Wong } 113833ba6129SDarrick J. Wong if (!error && *new_len > 0) 113933ba6129SDarrick J. Wong trace_xfs_refcount_finish_one_leftover(mp, agno, type, 114033ba6129SDarrick J. Wong bno, blockcount, new_agbno, *new_len); 114133ba6129SDarrick J. Wong return error; 114233ba6129SDarrick J. Wong 114333ba6129SDarrick J. Wong out_cur: 114433ba6129SDarrick J. Wong xfs_trans_brelse(tp, agbp); 114533ba6129SDarrick J. Wong 114633ba6129SDarrick J. Wong return error; 114733ba6129SDarrick J. Wong } 114833ba6129SDarrick J. Wong 114933ba6129SDarrick J. Wong /* 115033ba6129SDarrick J. Wong * Record a refcount intent for later processing. 115133ba6129SDarrick J. Wong */ 115233ba6129SDarrick J. Wong static int 115333ba6129SDarrick J. Wong __xfs_refcount_add( 115433ba6129SDarrick J. Wong struct xfs_mount *mp, 115533ba6129SDarrick J. Wong struct xfs_defer_ops *dfops, 115633ba6129SDarrick J. Wong enum xfs_refcount_intent_type type, 115733ba6129SDarrick J. Wong xfs_fsblock_t startblock, 115833ba6129SDarrick J. Wong xfs_extlen_t blockcount) 115933ba6129SDarrick J. Wong { 116033ba6129SDarrick J. Wong struct xfs_refcount_intent *ri; 116133ba6129SDarrick J. Wong 116233ba6129SDarrick J. Wong trace_xfs_refcount_defer(mp, XFS_FSB_TO_AGNO(mp, startblock), 116333ba6129SDarrick J. Wong type, XFS_FSB_TO_AGBNO(mp, startblock), 116433ba6129SDarrick J. Wong blockcount); 116533ba6129SDarrick J. Wong 116633ba6129SDarrick J. Wong ri = kmem_alloc(sizeof(struct xfs_refcount_intent), 116733ba6129SDarrick J. Wong KM_SLEEP | KM_NOFS); 116833ba6129SDarrick J. Wong INIT_LIST_HEAD(&ri->ri_list); 116933ba6129SDarrick J. Wong ri->ri_type = type; 117033ba6129SDarrick J. Wong ri->ri_startblock = startblock; 117133ba6129SDarrick J. Wong ri->ri_blockcount = blockcount; 117233ba6129SDarrick J. Wong 117333ba6129SDarrick J. Wong xfs_defer_add(dfops, XFS_DEFER_OPS_TYPE_REFCOUNT, &ri->ri_list); 117433ba6129SDarrick J. Wong return 0; 117533ba6129SDarrick J. Wong } 117633ba6129SDarrick J. Wong 117733ba6129SDarrick J. Wong /* 117833ba6129SDarrick J. Wong * Increase the reference count of the blocks backing a file's extent. 117933ba6129SDarrick J. Wong */ 118033ba6129SDarrick J. Wong int 118133ba6129SDarrick J. Wong xfs_refcount_increase_extent( 118233ba6129SDarrick J. Wong struct xfs_mount *mp, 118333ba6129SDarrick J. Wong struct xfs_defer_ops *dfops, 118433ba6129SDarrick J. Wong struct xfs_bmbt_irec *PREV) 118533ba6129SDarrick J. Wong { 118633ba6129SDarrick J. Wong if (!xfs_sb_version_hasreflink(&mp->m_sb)) 118733ba6129SDarrick J. Wong return 0; 118833ba6129SDarrick J. Wong 118933ba6129SDarrick J. Wong return __xfs_refcount_add(mp, dfops, XFS_REFCOUNT_INCREASE, 119033ba6129SDarrick J. Wong PREV->br_startblock, PREV->br_blockcount); 119133ba6129SDarrick J. Wong } 119233ba6129SDarrick J. Wong 119333ba6129SDarrick J. Wong /* 119433ba6129SDarrick J. Wong * Decrease the reference count of the blocks backing a file's extent. 119533ba6129SDarrick J. Wong */ 119633ba6129SDarrick J. Wong int 119733ba6129SDarrick J. Wong xfs_refcount_decrease_extent( 119833ba6129SDarrick J. Wong struct xfs_mount *mp, 119933ba6129SDarrick J. Wong struct xfs_defer_ops *dfops, 120033ba6129SDarrick J. Wong struct xfs_bmbt_irec *PREV) 120133ba6129SDarrick J. Wong { 120233ba6129SDarrick J. Wong if (!xfs_sb_version_hasreflink(&mp->m_sb)) 120333ba6129SDarrick J. Wong return 0; 120433ba6129SDarrick J. Wong 120533ba6129SDarrick J. Wong return __xfs_refcount_add(mp, dfops, XFS_REFCOUNT_DECREASE, 120633ba6129SDarrick J. Wong PREV->br_startblock, PREV->br_blockcount); 120733ba6129SDarrick J. Wong } 1208350a27a6SDarrick J. Wong 1209350a27a6SDarrick J. Wong /* 1210350a27a6SDarrick J. Wong * Given an AG extent, find the lowest-numbered run of shared blocks 1211350a27a6SDarrick J. Wong * within that range and return the range in fbno/flen. If 1212350a27a6SDarrick J. Wong * find_end_of_shared is set, return the longest contiguous extent of 1213350a27a6SDarrick J. Wong * shared blocks; if not, just return the first extent we find. If no 1214350a27a6SDarrick J. Wong * shared blocks are found, fbno and flen will be set to NULLAGBLOCK 1215350a27a6SDarrick J. Wong * and 0, respectively. 1216350a27a6SDarrick J. Wong */ 1217350a27a6SDarrick J. Wong int 1218350a27a6SDarrick J. Wong xfs_refcount_find_shared( 1219350a27a6SDarrick J. Wong struct xfs_btree_cur *cur, 1220350a27a6SDarrick J. Wong xfs_agblock_t agbno, 1221350a27a6SDarrick J. Wong xfs_extlen_t aglen, 1222350a27a6SDarrick J. Wong xfs_agblock_t *fbno, 1223350a27a6SDarrick J. Wong xfs_extlen_t *flen, 1224350a27a6SDarrick J. Wong bool find_end_of_shared) 1225350a27a6SDarrick J. Wong { 1226350a27a6SDarrick J. Wong struct xfs_refcount_irec tmp; 1227350a27a6SDarrick J. Wong int i; 1228350a27a6SDarrick J. Wong int have; 1229350a27a6SDarrick J. Wong int error; 1230350a27a6SDarrick J. Wong 1231350a27a6SDarrick J. Wong trace_xfs_refcount_find_shared(cur->bc_mp, cur->bc_private.a.agno, 1232350a27a6SDarrick J. Wong agbno, aglen); 1233350a27a6SDarrick J. Wong 1234350a27a6SDarrick J. Wong /* By default, skip the whole range */ 1235350a27a6SDarrick J. Wong *fbno = NULLAGBLOCK; 1236350a27a6SDarrick J. Wong *flen = 0; 1237350a27a6SDarrick J. Wong 1238350a27a6SDarrick J. Wong /* Try to find a refcount extent that crosses the start */ 1239350a27a6SDarrick J. Wong error = xfs_refcount_lookup_le(cur, agbno, &have); 1240350a27a6SDarrick J. Wong if (error) 1241350a27a6SDarrick J. Wong goto out_error; 1242350a27a6SDarrick J. Wong if (!have) { 1243350a27a6SDarrick J. Wong /* No left extent, look at the next one */ 1244350a27a6SDarrick J. Wong error = xfs_btree_increment(cur, 0, &have); 1245350a27a6SDarrick J. Wong if (error) 1246350a27a6SDarrick J. Wong goto out_error; 1247350a27a6SDarrick J. Wong if (!have) 1248350a27a6SDarrick J. Wong goto done; 1249350a27a6SDarrick J. Wong } 1250350a27a6SDarrick J. Wong error = xfs_refcount_get_rec(cur, &tmp, &i); 1251350a27a6SDarrick J. Wong if (error) 1252350a27a6SDarrick J. Wong goto out_error; 1253350a27a6SDarrick J. Wong XFS_WANT_CORRUPTED_GOTO(cur->bc_mp, i == 1, out_error); 1254350a27a6SDarrick J. Wong 1255350a27a6SDarrick J. Wong /* If the extent ends before the start, look at the next one */ 1256350a27a6SDarrick J. Wong if (tmp.rc_startblock + tmp.rc_blockcount <= agbno) { 1257350a27a6SDarrick J. Wong error = xfs_btree_increment(cur, 0, &have); 1258350a27a6SDarrick J. Wong if (error) 1259350a27a6SDarrick J. Wong goto out_error; 1260350a27a6SDarrick J. Wong if (!have) 1261350a27a6SDarrick J. Wong goto done; 1262350a27a6SDarrick J. Wong error = xfs_refcount_get_rec(cur, &tmp, &i); 1263350a27a6SDarrick J. Wong if (error) 1264350a27a6SDarrick J. Wong goto out_error; 1265350a27a6SDarrick J. Wong XFS_WANT_CORRUPTED_GOTO(cur->bc_mp, i == 1, out_error); 1266350a27a6SDarrick J. Wong } 1267350a27a6SDarrick J. Wong 1268350a27a6SDarrick J. Wong /* If the extent starts after the range we want, bail out */ 1269350a27a6SDarrick J. Wong if (tmp.rc_startblock >= agbno + aglen) 1270350a27a6SDarrick J. Wong goto done; 1271350a27a6SDarrick J. Wong 1272350a27a6SDarrick J. Wong /* We found the start of a shared extent! */ 1273350a27a6SDarrick J. Wong if (tmp.rc_startblock < agbno) { 1274350a27a6SDarrick J. Wong tmp.rc_blockcount -= (agbno - tmp.rc_startblock); 1275350a27a6SDarrick J. Wong tmp.rc_startblock = agbno; 1276350a27a6SDarrick J. Wong } 1277350a27a6SDarrick J. Wong 1278350a27a6SDarrick J. Wong *fbno = tmp.rc_startblock; 1279350a27a6SDarrick J. Wong *flen = min(tmp.rc_blockcount, agbno + aglen - *fbno); 1280350a27a6SDarrick J. Wong if (!find_end_of_shared) 1281350a27a6SDarrick J. Wong goto done; 1282350a27a6SDarrick J. Wong 1283350a27a6SDarrick J. Wong /* Otherwise, find the end of this shared extent */ 1284350a27a6SDarrick J. Wong while (*fbno + *flen < agbno + aglen) { 1285350a27a6SDarrick J. Wong error = xfs_btree_increment(cur, 0, &have); 1286350a27a6SDarrick J. Wong if (error) 1287350a27a6SDarrick J. Wong goto out_error; 1288350a27a6SDarrick J. Wong if (!have) 1289350a27a6SDarrick J. Wong break; 1290350a27a6SDarrick J. Wong error = xfs_refcount_get_rec(cur, &tmp, &i); 1291350a27a6SDarrick J. Wong if (error) 1292350a27a6SDarrick J. Wong goto out_error; 1293350a27a6SDarrick J. Wong XFS_WANT_CORRUPTED_GOTO(cur->bc_mp, i == 1, out_error); 1294350a27a6SDarrick J. Wong if (tmp.rc_startblock >= agbno + aglen || 1295350a27a6SDarrick J. Wong tmp.rc_startblock != *fbno + *flen) 1296350a27a6SDarrick J. Wong break; 1297350a27a6SDarrick J. Wong *flen = min(*flen + tmp.rc_blockcount, agbno + aglen - *fbno); 1298350a27a6SDarrick J. Wong } 1299350a27a6SDarrick J. Wong 1300350a27a6SDarrick J. Wong done: 1301350a27a6SDarrick J. Wong trace_xfs_refcount_find_shared_result(cur->bc_mp, 1302350a27a6SDarrick J. Wong cur->bc_private.a.agno, *fbno, *flen); 1303350a27a6SDarrick J. Wong 1304350a27a6SDarrick J. Wong out_error: 1305350a27a6SDarrick J. Wong if (error) 1306350a27a6SDarrick J. Wong trace_xfs_refcount_find_shared_error(cur->bc_mp, 1307350a27a6SDarrick J. Wong cur->bc_private.a.agno, error, _RET_IP_); 1308350a27a6SDarrick J. Wong return error; 1309350a27a6SDarrick J. Wong } 1310174edb0eSDarrick J. Wong 1311174edb0eSDarrick J. Wong /* 1312174edb0eSDarrick J. Wong * Recovering CoW Blocks After a Crash 1313174edb0eSDarrick J. Wong * 1314174edb0eSDarrick J. Wong * Due to the way that the copy on write mechanism works, there's a window of 1315174edb0eSDarrick J. Wong * opportunity in which we can lose track of allocated blocks during a crash. 1316174edb0eSDarrick J. Wong * Because CoW uses delayed allocation in the in-core CoW fork, writeback 1317174edb0eSDarrick J. Wong * causes blocks to be allocated and stored in the CoW fork. The blocks are 1318174edb0eSDarrick J. Wong * no longer in the free space btree but are not otherwise recorded anywhere 1319174edb0eSDarrick J. Wong * until the write completes and the blocks are mapped into the file. A crash 1320174edb0eSDarrick J. Wong * in between allocation and remapping results in the replacement blocks being 1321174edb0eSDarrick J. Wong * lost. This situation is exacerbated by the CoW extent size hint because 1322174edb0eSDarrick J. Wong * allocations can hang around for long time. 1323174edb0eSDarrick J. Wong * 1324174edb0eSDarrick J. Wong * However, there is a place where we can record these allocations before they 1325174edb0eSDarrick J. Wong * become mappings -- the reference count btree. The btree does not record 1326174edb0eSDarrick J. Wong * extents with refcount == 1, so we can record allocations with a refcount of 1327174edb0eSDarrick J. Wong * 1. Blocks being used for CoW writeout cannot be shared, so there should be 1328174edb0eSDarrick J. Wong * no conflict with shared block records. These mappings should be created 1329174edb0eSDarrick J. Wong * when we allocate blocks to the CoW fork and deleted when they're removed 1330174edb0eSDarrick J. Wong * from the CoW fork. 1331174edb0eSDarrick J. Wong * 1332174edb0eSDarrick J. Wong * Minor nit: records for in-progress CoW allocations and records for shared 1333174edb0eSDarrick J. Wong * extents must never be merged, to preserve the property that (except for CoW 1334174edb0eSDarrick J. Wong * allocations) there are no refcount btree entries with refcount == 1. The 1335174edb0eSDarrick J. Wong * only time this could potentially happen is when unsharing a block that's 1336174edb0eSDarrick J. Wong * adjacent to CoW allocations, so we must be careful to avoid this. 1337174edb0eSDarrick J. Wong * 1338174edb0eSDarrick J. Wong * At mount time we recover lost CoW allocations by searching the refcount 1339174edb0eSDarrick J. Wong * btree for these refcount == 1 mappings. These represent CoW allocations 1340174edb0eSDarrick J. Wong * that were in progress at the time the filesystem went down, so we can free 1341174edb0eSDarrick J. Wong * them to get the space back. 1342174edb0eSDarrick J. Wong * 1343174edb0eSDarrick J. Wong * This mechanism is superior to creating EFIs for unmapped CoW extents for 1344174edb0eSDarrick J. Wong * several reasons -- first, EFIs pin the tail of the log and would have to be 1345174edb0eSDarrick J. Wong * periodically relogged to avoid filling up the log. Second, CoW completions 1346174edb0eSDarrick J. Wong * will have to file an EFD and create new EFIs for whatever remains in the 1347174edb0eSDarrick J. Wong * CoW fork; this partially takes care of (1) but extent-size reservations 1348174edb0eSDarrick J. Wong * will have to periodically relog even if there's no writeout in progress. 1349174edb0eSDarrick J. Wong * This can happen if the CoW extent size hint is set, which you really want. 1350174edb0eSDarrick J. Wong * Third, EFIs cannot currently be automatically relogged into newer 1351174edb0eSDarrick J. Wong * transactions to advance the log tail. Fourth, stuffing the log full of 1352174edb0eSDarrick J. Wong * EFIs places an upper bound on the number of CoW allocations that can be 1353174edb0eSDarrick J. Wong * held filesystem-wide at any given time. Recording them in the refcount 1354174edb0eSDarrick J. Wong * btree doesn't require us to maintain any state in memory and doesn't pin 1355174edb0eSDarrick J. Wong * the log. 1356174edb0eSDarrick J. Wong */ 1357174edb0eSDarrick J. Wong /* 1358174edb0eSDarrick J. Wong * Adjust the refcounts of CoW allocations. These allocations are "magic" 1359174edb0eSDarrick J. Wong * in that they're not referenced anywhere else in the filesystem, so we 1360174edb0eSDarrick J. Wong * stash them in the refcount btree with a refcount of 1 until either file 1361174edb0eSDarrick J. Wong * remapping (or CoW cancellation) happens. 1362174edb0eSDarrick J. Wong */ 1363174edb0eSDarrick J. Wong STATIC int 1364174edb0eSDarrick J. Wong xfs_refcount_adjust_cow_extents( 1365174edb0eSDarrick J. Wong struct xfs_btree_cur *cur, 1366174edb0eSDarrick J. Wong xfs_agblock_t agbno, 1367174edb0eSDarrick J. Wong xfs_extlen_t aglen, 1368174edb0eSDarrick J. Wong enum xfs_refc_adjust_op adj, 1369174edb0eSDarrick J. Wong struct xfs_defer_ops *dfops, 1370174edb0eSDarrick J. Wong struct xfs_owner_info *oinfo) 1371174edb0eSDarrick J. Wong { 1372174edb0eSDarrick J. Wong struct xfs_refcount_irec ext, tmp; 1373174edb0eSDarrick J. Wong int error; 1374174edb0eSDarrick J. Wong int found_rec, found_tmp; 1375174edb0eSDarrick J. Wong 1376174edb0eSDarrick J. Wong if (aglen == 0) 1377174edb0eSDarrick J. Wong return 0; 1378174edb0eSDarrick J. Wong 1379174edb0eSDarrick J. Wong /* Find any overlapping refcount records */ 1380174edb0eSDarrick J. Wong error = xfs_refcount_lookup_ge(cur, agbno, &found_rec); 1381174edb0eSDarrick J. Wong if (error) 1382174edb0eSDarrick J. Wong goto out_error; 1383174edb0eSDarrick J. Wong error = xfs_refcount_get_rec(cur, &ext, &found_rec); 1384174edb0eSDarrick J. Wong if (error) 1385174edb0eSDarrick J. Wong goto out_error; 1386174edb0eSDarrick J. Wong if (!found_rec) { 1387174edb0eSDarrick J. Wong ext.rc_startblock = cur->bc_mp->m_sb.sb_agblocks + 1388174edb0eSDarrick J. Wong XFS_REFC_COW_START; 1389174edb0eSDarrick J. Wong ext.rc_blockcount = 0; 1390174edb0eSDarrick J. Wong ext.rc_refcount = 0; 1391174edb0eSDarrick J. Wong } 1392174edb0eSDarrick J. Wong 1393174edb0eSDarrick J. Wong switch (adj) { 1394174edb0eSDarrick J. Wong case XFS_REFCOUNT_ADJUST_COW_ALLOC: 1395174edb0eSDarrick J. Wong /* Adding a CoW reservation, there should be nothing here. */ 1396174edb0eSDarrick J. Wong XFS_WANT_CORRUPTED_GOTO(cur->bc_mp, 1397174edb0eSDarrick J. Wong ext.rc_startblock >= agbno + aglen, out_error); 1398174edb0eSDarrick J. Wong 1399174edb0eSDarrick J. Wong tmp.rc_startblock = agbno; 1400174edb0eSDarrick J. Wong tmp.rc_blockcount = aglen; 1401174edb0eSDarrick J. Wong tmp.rc_refcount = 1; 1402174edb0eSDarrick J. Wong trace_xfs_refcount_modify_extent(cur->bc_mp, 1403174edb0eSDarrick J. Wong cur->bc_private.a.agno, &tmp); 1404174edb0eSDarrick J. Wong 1405174edb0eSDarrick J. Wong error = xfs_refcount_insert(cur, &tmp, 1406174edb0eSDarrick J. Wong &found_tmp); 1407174edb0eSDarrick J. Wong if (error) 1408174edb0eSDarrick J. Wong goto out_error; 1409174edb0eSDarrick J. Wong XFS_WANT_CORRUPTED_GOTO(cur->bc_mp, 1410174edb0eSDarrick J. Wong found_tmp == 1, out_error); 1411174edb0eSDarrick J. Wong break; 1412174edb0eSDarrick J. Wong case XFS_REFCOUNT_ADJUST_COW_FREE: 1413174edb0eSDarrick J. Wong /* Removing a CoW reservation, there should be one extent. */ 1414174edb0eSDarrick J. Wong XFS_WANT_CORRUPTED_GOTO(cur->bc_mp, 1415174edb0eSDarrick J. Wong ext.rc_startblock == agbno, out_error); 1416174edb0eSDarrick J. Wong XFS_WANT_CORRUPTED_GOTO(cur->bc_mp, 1417174edb0eSDarrick J. Wong ext.rc_blockcount == aglen, out_error); 1418174edb0eSDarrick J. Wong XFS_WANT_CORRUPTED_GOTO(cur->bc_mp, 1419174edb0eSDarrick J. Wong ext.rc_refcount == 1, out_error); 1420174edb0eSDarrick J. Wong 1421174edb0eSDarrick J. Wong ext.rc_refcount = 0; 1422174edb0eSDarrick J. Wong trace_xfs_refcount_modify_extent(cur->bc_mp, 1423174edb0eSDarrick J. Wong cur->bc_private.a.agno, &ext); 1424174edb0eSDarrick J. Wong error = xfs_refcount_delete(cur, &found_rec); 1425174edb0eSDarrick J. Wong if (error) 1426174edb0eSDarrick J. Wong goto out_error; 1427174edb0eSDarrick J. Wong XFS_WANT_CORRUPTED_GOTO(cur->bc_mp, 1428174edb0eSDarrick J. Wong found_rec == 1, out_error); 1429174edb0eSDarrick J. Wong break; 1430174edb0eSDarrick J. Wong default: 1431174edb0eSDarrick J. Wong ASSERT(0); 1432174edb0eSDarrick J. Wong } 1433174edb0eSDarrick J. Wong 1434174edb0eSDarrick J. Wong return error; 1435174edb0eSDarrick J. Wong out_error: 1436174edb0eSDarrick J. Wong trace_xfs_refcount_modify_extent_error(cur->bc_mp, 1437174edb0eSDarrick J. Wong cur->bc_private.a.agno, error, _RET_IP_); 1438174edb0eSDarrick J. Wong return error; 1439174edb0eSDarrick J. Wong } 1440174edb0eSDarrick J. Wong 1441174edb0eSDarrick J. Wong /* 1442174edb0eSDarrick J. Wong * Add or remove refcount btree entries for CoW reservations. 1443174edb0eSDarrick J. Wong */ 1444174edb0eSDarrick J. Wong STATIC int 1445174edb0eSDarrick J. Wong xfs_refcount_adjust_cow( 1446174edb0eSDarrick J. Wong struct xfs_btree_cur *cur, 1447174edb0eSDarrick J. Wong xfs_agblock_t agbno, 1448174edb0eSDarrick J. Wong xfs_extlen_t aglen, 1449174edb0eSDarrick J. Wong enum xfs_refc_adjust_op adj, 1450174edb0eSDarrick J. Wong struct xfs_defer_ops *dfops) 1451174edb0eSDarrick J. Wong { 1452174edb0eSDarrick J. Wong bool shape_changed; 1453174edb0eSDarrick J. Wong int error; 1454174edb0eSDarrick J. Wong 1455174edb0eSDarrick J. Wong agbno += XFS_REFC_COW_START; 1456174edb0eSDarrick J. Wong 1457174edb0eSDarrick J. Wong /* 1458174edb0eSDarrick J. Wong * Ensure that no rcextents cross the boundary of the adjustment range. 1459174edb0eSDarrick J. Wong */ 1460174edb0eSDarrick J. Wong error = xfs_refcount_split_extent(cur, agbno, &shape_changed); 1461174edb0eSDarrick J. Wong if (error) 1462174edb0eSDarrick J. Wong goto out_error; 1463174edb0eSDarrick J. Wong 1464174edb0eSDarrick J. Wong error = xfs_refcount_split_extent(cur, agbno + aglen, &shape_changed); 1465174edb0eSDarrick J. Wong if (error) 1466174edb0eSDarrick J. Wong goto out_error; 1467174edb0eSDarrick J. Wong 1468174edb0eSDarrick J. Wong /* 1469174edb0eSDarrick J. Wong * Try to merge with the left or right extents of the range. 1470174edb0eSDarrick J. Wong */ 1471174edb0eSDarrick J. Wong error = xfs_refcount_merge_extents(cur, &agbno, &aglen, adj, 1472174edb0eSDarrick J. Wong XFS_FIND_RCEXT_COW, &shape_changed); 1473174edb0eSDarrick J. Wong if (error) 1474174edb0eSDarrick J. Wong goto out_error; 1475174edb0eSDarrick J. Wong 1476174edb0eSDarrick J. Wong /* Now that we've taken care of the ends, adjust the middle extents */ 1477174edb0eSDarrick J. Wong error = xfs_refcount_adjust_cow_extents(cur, agbno, aglen, adj, 1478174edb0eSDarrick J. Wong dfops, NULL); 1479174edb0eSDarrick J. Wong if (error) 1480174edb0eSDarrick J. Wong goto out_error; 1481174edb0eSDarrick J. Wong 1482174edb0eSDarrick J. Wong return 0; 1483174edb0eSDarrick J. Wong 1484174edb0eSDarrick J. Wong out_error: 1485174edb0eSDarrick J. Wong trace_xfs_refcount_adjust_cow_error(cur->bc_mp, cur->bc_private.a.agno, 1486174edb0eSDarrick J. Wong error, _RET_IP_); 1487174edb0eSDarrick J. Wong return error; 1488174edb0eSDarrick J. Wong } 1489174edb0eSDarrick J. Wong 1490174edb0eSDarrick J. Wong /* 1491174edb0eSDarrick J. Wong * Record a CoW allocation in the refcount btree. 1492174edb0eSDarrick J. Wong */ 1493174edb0eSDarrick J. Wong STATIC int 1494174edb0eSDarrick J. Wong __xfs_refcount_cow_alloc( 1495174edb0eSDarrick J. Wong struct xfs_btree_cur *rcur, 1496174edb0eSDarrick J. Wong xfs_agblock_t agbno, 1497174edb0eSDarrick J. Wong xfs_extlen_t aglen, 1498174edb0eSDarrick J. Wong struct xfs_defer_ops *dfops) 1499174edb0eSDarrick J. Wong { 1500174edb0eSDarrick J. Wong int error; 1501174edb0eSDarrick J. Wong 1502174edb0eSDarrick J. Wong trace_xfs_refcount_cow_increase(rcur->bc_mp, rcur->bc_private.a.agno, 1503174edb0eSDarrick J. Wong agbno, aglen); 1504174edb0eSDarrick J. Wong 1505174edb0eSDarrick J. Wong /* Add refcount btree reservation */ 1506174edb0eSDarrick J. Wong error = xfs_refcount_adjust_cow(rcur, agbno, aglen, 1507174edb0eSDarrick J. Wong XFS_REFCOUNT_ADJUST_COW_ALLOC, dfops); 1508174edb0eSDarrick J. Wong if (error) 1509174edb0eSDarrick J. Wong return error; 1510174edb0eSDarrick J. Wong 1511174edb0eSDarrick J. Wong /* Add rmap entry */ 1512174edb0eSDarrick J. Wong if (xfs_sb_version_hasrmapbt(&rcur->bc_mp->m_sb)) { 1513174edb0eSDarrick J. Wong error = xfs_rmap_alloc_extent(rcur->bc_mp, dfops, 1514174edb0eSDarrick J. Wong rcur->bc_private.a.agno, 1515174edb0eSDarrick J. Wong agbno, aglen, XFS_RMAP_OWN_COW); 1516174edb0eSDarrick J. Wong if (error) 1517174edb0eSDarrick J. Wong return error; 1518174edb0eSDarrick J. Wong } 1519174edb0eSDarrick J. Wong 1520174edb0eSDarrick J. Wong return error; 1521174edb0eSDarrick J. Wong } 1522174edb0eSDarrick J. Wong 1523174edb0eSDarrick J. Wong /* 1524174edb0eSDarrick J. Wong * Remove a CoW allocation from the refcount btree. 1525174edb0eSDarrick J. Wong */ 1526174edb0eSDarrick J. Wong STATIC int 1527174edb0eSDarrick J. Wong __xfs_refcount_cow_free( 1528174edb0eSDarrick J. Wong struct xfs_btree_cur *rcur, 1529174edb0eSDarrick J. Wong xfs_agblock_t agbno, 1530174edb0eSDarrick J. Wong xfs_extlen_t aglen, 1531174edb0eSDarrick J. Wong struct xfs_defer_ops *dfops) 1532174edb0eSDarrick J. Wong { 1533174edb0eSDarrick J. Wong int error; 1534174edb0eSDarrick J. Wong 1535174edb0eSDarrick J. Wong trace_xfs_refcount_cow_decrease(rcur->bc_mp, rcur->bc_private.a.agno, 1536174edb0eSDarrick J. Wong agbno, aglen); 1537174edb0eSDarrick J. Wong 1538174edb0eSDarrick J. Wong /* Remove refcount btree reservation */ 1539174edb0eSDarrick J. Wong error = xfs_refcount_adjust_cow(rcur, agbno, aglen, 1540174edb0eSDarrick J. Wong XFS_REFCOUNT_ADJUST_COW_FREE, dfops); 1541174edb0eSDarrick J. Wong if (error) 1542174edb0eSDarrick J. Wong return error; 1543174edb0eSDarrick J. Wong 1544174edb0eSDarrick J. Wong /* Remove rmap entry */ 1545174edb0eSDarrick J. Wong if (xfs_sb_version_hasrmapbt(&rcur->bc_mp->m_sb)) { 1546174edb0eSDarrick J. Wong error = xfs_rmap_free_extent(rcur->bc_mp, dfops, 1547174edb0eSDarrick J. Wong rcur->bc_private.a.agno, 1548174edb0eSDarrick J. Wong agbno, aglen, XFS_RMAP_OWN_COW); 1549174edb0eSDarrick J. Wong if (error) 1550174edb0eSDarrick J. Wong return error; 1551174edb0eSDarrick J. Wong } 1552174edb0eSDarrick J. Wong 1553174edb0eSDarrick J. Wong return error; 1554174edb0eSDarrick J. Wong } 1555174edb0eSDarrick J. Wong 1556174edb0eSDarrick J. Wong /* Record a CoW staging extent in the refcount btree. */ 1557174edb0eSDarrick J. Wong int 1558174edb0eSDarrick J. Wong xfs_refcount_alloc_cow_extent( 1559174edb0eSDarrick J. Wong struct xfs_mount *mp, 1560174edb0eSDarrick J. Wong struct xfs_defer_ops *dfops, 1561174edb0eSDarrick J. Wong xfs_fsblock_t fsb, 1562174edb0eSDarrick J. Wong xfs_extlen_t len) 1563174edb0eSDarrick J. Wong { 1564174edb0eSDarrick J. Wong if (!xfs_sb_version_hasreflink(&mp->m_sb)) 1565174edb0eSDarrick J. Wong return 0; 1566174edb0eSDarrick J. Wong 1567174edb0eSDarrick J. Wong return __xfs_refcount_add(mp, dfops, XFS_REFCOUNT_ALLOC_COW, 1568174edb0eSDarrick J. Wong fsb, len); 1569174edb0eSDarrick J. Wong } 1570174edb0eSDarrick J. Wong 1571174edb0eSDarrick J. Wong /* Forget a CoW staging event in the refcount btree. */ 1572174edb0eSDarrick J. Wong int 1573174edb0eSDarrick J. Wong xfs_refcount_free_cow_extent( 1574174edb0eSDarrick J. Wong struct xfs_mount *mp, 1575174edb0eSDarrick J. Wong struct xfs_defer_ops *dfops, 1576174edb0eSDarrick J. Wong xfs_fsblock_t fsb, 1577174edb0eSDarrick J. Wong xfs_extlen_t len) 1578174edb0eSDarrick J. Wong { 1579174edb0eSDarrick J. Wong if (!xfs_sb_version_hasreflink(&mp->m_sb)) 1580174edb0eSDarrick J. Wong return 0; 1581174edb0eSDarrick J. Wong 1582174edb0eSDarrick J. Wong return __xfs_refcount_add(mp, dfops, XFS_REFCOUNT_FREE_COW, 1583174edb0eSDarrick J. Wong fsb, len); 1584174edb0eSDarrick J. Wong } 1585174edb0eSDarrick J. Wong 1586174edb0eSDarrick J. Wong struct xfs_refcount_recovery { 1587174edb0eSDarrick J. Wong struct list_head rr_list; 1588174edb0eSDarrick J. Wong struct xfs_refcount_irec rr_rrec; 1589174edb0eSDarrick J. Wong }; 1590174edb0eSDarrick J. Wong 1591174edb0eSDarrick J. Wong /* Stuff an extent on the recovery list. */ 1592174edb0eSDarrick J. Wong STATIC int 1593174edb0eSDarrick J. Wong xfs_refcount_recover_extent( 1594174edb0eSDarrick J. Wong struct xfs_btree_cur *cur, 1595174edb0eSDarrick J. Wong union xfs_btree_rec *rec, 1596174edb0eSDarrick J. Wong void *priv) 1597174edb0eSDarrick J. Wong { 1598174edb0eSDarrick J. Wong struct list_head *debris = priv; 1599174edb0eSDarrick J. Wong struct xfs_refcount_recovery *rr; 1600174edb0eSDarrick J. Wong 1601174edb0eSDarrick J. Wong if (be32_to_cpu(rec->refc.rc_refcount) != 1) 1602174edb0eSDarrick J. Wong return -EFSCORRUPTED; 1603174edb0eSDarrick J. Wong 1604174edb0eSDarrick J. Wong rr = kmem_alloc(sizeof(struct xfs_refcount_recovery), KM_SLEEP); 1605174edb0eSDarrick J. Wong xfs_refcount_btrec_to_irec(rec, &rr->rr_rrec); 1606174edb0eSDarrick J. Wong list_add_tail(&rr->rr_list, debris); 1607174edb0eSDarrick J. Wong 1608174edb0eSDarrick J. Wong return 0; 1609174edb0eSDarrick J. Wong } 1610174edb0eSDarrick J. Wong 1611174edb0eSDarrick J. Wong /* Find and remove leftover CoW reservations. */ 1612174edb0eSDarrick J. Wong int 1613174edb0eSDarrick J. Wong xfs_refcount_recover_cow_leftovers( 1614174edb0eSDarrick J. Wong struct xfs_mount *mp, 1615174edb0eSDarrick J. Wong xfs_agnumber_t agno) 1616174edb0eSDarrick J. Wong { 1617174edb0eSDarrick J. Wong struct xfs_trans *tp; 1618174edb0eSDarrick J. Wong struct xfs_btree_cur *cur; 1619174edb0eSDarrick J. Wong struct xfs_buf *agbp; 1620174edb0eSDarrick J. Wong struct xfs_refcount_recovery *rr, *n; 1621174edb0eSDarrick J. Wong struct list_head debris; 1622174edb0eSDarrick J. Wong union xfs_btree_irec low; 1623174edb0eSDarrick J. Wong union xfs_btree_irec high; 1624174edb0eSDarrick J. Wong struct xfs_defer_ops dfops; 1625174edb0eSDarrick J. Wong xfs_fsblock_t fsb; 1626174edb0eSDarrick J. Wong xfs_agblock_t agbno; 1627174edb0eSDarrick J. Wong int error; 1628174edb0eSDarrick J. Wong 1629174edb0eSDarrick J. Wong if (mp->m_sb.sb_agblocks >= XFS_REFC_COW_START) 1630174edb0eSDarrick J. Wong return -EOPNOTSUPP; 1631174edb0eSDarrick J. Wong 1632174edb0eSDarrick J. Wong error = xfs_alloc_read_agf(mp, NULL, agno, 0, &agbp); 1633174edb0eSDarrick J. Wong if (error) 1634174edb0eSDarrick J. Wong return error; 1635174edb0eSDarrick J. Wong cur = xfs_refcountbt_init_cursor(mp, NULL, agbp, agno, NULL); 1636174edb0eSDarrick J. Wong 1637174edb0eSDarrick J. Wong /* Find all the leftover CoW staging extents. */ 1638174edb0eSDarrick J. Wong INIT_LIST_HEAD(&debris); 1639174edb0eSDarrick J. Wong memset(&low, 0, sizeof(low)); 1640174edb0eSDarrick J. Wong memset(&high, 0, sizeof(high)); 1641174edb0eSDarrick J. Wong low.rc.rc_startblock = XFS_REFC_COW_START; 1642174edb0eSDarrick J. Wong high.rc.rc_startblock = -1U; 1643174edb0eSDarrick J. Wong error = xfs_btree_query_range(cur, &low, &high, 1644174edb0eSDarrick J. Wong xfs_refcount_recover_extent, &debris); 1645174edb0eSDarrick J. Wong if (error) 1646174edb0eSDarrick J. Wong goto out_error; 1647174edb0eSDarrick J. Wong xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR); 1648174edb0eSDarrick J. Wong xfs_buf_relse(agbp); 1649174edb0eSDarrick J. Wong 1650174edb0eSDarrick J. Wong /* Now iterate the list to free the leftovers */ 1651174edb0eSDarrick J. Wong list_for_each_entry(rr, &debris, rr_list) { 1652174edb0eSDarrick J. Wong /* Set up transaction. */ 1653174edb0eSDarrick J. Wong error = xfs_trans_alloc(mp, &M_RES(mp)->tr_write, 0, 0, 0, &tp); 1654174edb0eSDarrick J. Wong if (error) 1655174edb0eSDarrick J. Wong goto out_free; 1656174edb0eSDarrick J. Wong 1657174edb0eSDarrick J. Wong trace_xfs_refcount_recover_extent(mp, agno, &rr->rr_rrec); 1658174edb0eSDarrick J. Wong 1659174edb0eSDarrick J. Wong /* Free the orphan record */ 1660174edb0eSDarrick J. Wong xfs_defer_init(&dfops, &fsb); 1661174edb0eSDarrick J. Wong agbno = rr->rr_rrec.rc_startblock - XFS_REFC_COW_START; 1662174edb0eSDarrick J. Wong fsb = XFS_AGB_TO_FSB(mp, agno, agbno); 1663174edb0eSDarrick J. Wong error = xfs_refcount_free_cow_extent(mp, &dfops, fsb, 1664174edb0eSDarrick J. Wong rr->rr_rrec.rc_blockcount); 1665174edb0eSDarrick J. Wong if (error) 1666174edb0eSDarrick J. Wong goto out_defer; 1667174edb0eSDarrick J. Wong 1668174edb0eSDarrick J. Wong /* Free the block. */ 1669174edb0eSDarrick J. Wong xfs_bmap_add_free(mp, &dfops, fsb, 1670174edb0eSDarrick J. Wong rr->rr_rrec.rc_blockcount, NULL); 1671174edb0eSDarrick J. Wong 1672174edb0eSDarrick J. Wong error = xfs_defer_finish(&tp, &dfops, NULL); 1673174edb0eSDarrick J. Wong if (error) 1674174edb0eSDarrick J. Wong goto out_defer; 1675174edb0eSDarrick J. Wong 1676174edb0eSDarrick J. Wong error = xfs_trans_commit(tp); 1677174edb0eSDarrick J. Wong if (error) 1678174edb0eSDarrick J. Wong goto out_cancel; 1679174edb0eSDarrick J. Wong } 1680174edb0eSDarrick J. Wong goto out_free; 1681174edb0eSDarrick J. Wong 1682174edb0eSDarrick J. Wong out_defer: 1683174edb0eSDarrick J. Wong xfs_defer_cancel(&dfops); 1684174edb0eSDarrick J. Wong out_cancel: 1685174edb0eSDarrick J. Wong xfs_trans_cancel(tp); 1686174edb0eSDarrick J. Wong 1687174edb0eSDarrick J. Wong out_free: 1688174edb0eSDarrick J. Wong /* Free the leftover list */ 1689174edb0eSDarrick J. Wong list_for_each_entry_safe(rr, n, &debris, rr_list) { 1690174edb0eSDarrick J. Wong list_del(&rr->rr_list); 1691174edb0eSDarrick J. Wong kmem_free(rr); 1692174edb0eSDarrick J. Wong } 1693174edb0eSDarrick J. Wong 1694174edb0eSDarrick J. Wong return error; 1695174edb0eSDarrick J. Wong 1696174edb0eSDarrick J. Wong out_error: 1697174edb0eSDarrick J. Wong xfs_btree_del_cursor(cur, XFS_BTREE_ERROR); 1698174edb0eSDarrick J. Wong xfs_buf_relse(agbp); 1699174edb0eSDarrick J. Wong return error; 1700174edb0eSDarrick J. Wong } 1701