diff options
Diffstat (limited to 'fs/xfs/libxfs/xfs_refcount.c')
| -rw-r--r-- | fs/xfs/libxfs/xfs_refcount.c | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/fs/xfs/libxfs/xfs_refcount.c b/fs/xfs/libxfs/xfs_refcount.c new file mode 100644 index 000000000000..de1340652933 --- /dev/null +++ b/fs/xfs/libxfs/xfs_refcount.c @@ -0,0 +1,177 @@ +/* + * Copyright (C) 2016 Oracle. All Rights Reserved. + * + * Author: Darrick J. Wong <darrick.wong@oracle.com> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it would be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. + */ +#include "xfs.h" +#include "xfs_fs.h" +#include "xfs_shared.h" +#include "xfs_format.h" +#include "xfs_log_format.h" +#include "xfs_trans_resv.h" +#include "xfs_sb.h" +#include "xfs_mount.h" +#include "xfs_defer.h" +#include "xfs_btree.h" +#include "xfs_bmap.h" +#include "xfs_refcount_btree.h" +#include "xfs_alloc.h" +#include "xfs_error.h" +#include "xfs_trace.h" +#include "xfs_cksum.h" +#include "xfs_trans.h" +#include "xfs_bit.h" +#include "xfs_refcount.h" + +/* + * Look up the first record less than or equal to [bno, len] in the btree + * given by cur. + */ +int +xfs_refcount_lookup_le( + struct xfs_btree_cur *cur, + xfs_agblock_t bno, + int *stat) +{ + trace_xfs_refcount_lookup(cur->bc_mp, cur->bc_private.a.agno, bno, + XFS_LOOKUP_LE); + cur->bc_rec.rc.rc_startblock = bno; + cur->bc_rec.rc.rc_blockcount = 0; + return xfs_btree_lookup(cur, XFS_LOOKUP_LE, stat); +} + +/* + * Look up the first record greater than or equal to [bno, len] in the btree + * given by cur. + */ +int +xfs_refcount_lookup_ge( + struct xfs_btree_cur *cur, + xfs_agblock_t bno, + int *stat) +{ + trace_xfs_refcount_lookup(cur->bc_mp, cur->bc_private.a.agno, bno, + XFS_LOOKUP_GE); + cur->bc_rec.rc.rc_startblock = bno; + cur->bc_rec.rc.rc_blockcount = 0; + return xfs_btree_lookup(cur, XFS_LOOKUP_GE, stat); +} + +/* + * Get the data from the pointed-to record. + */ +int +xfs_refcount_get_rec( + struct xfs_btree_cur *cur, + struct xfs_refcount_irec *irec, + int *stat) +{ + union xfs_btree_rec *rec; + int error; + + error = xfs_btree_get_rec(cur, &rec, stat); + if (!error && *stat == 1) { + irec->rc_startblock = be32_to_cpu(rec->refc.rc_startblock); + irec->rc_blockcount = be32_to_cpu(rec->refc.rc_blockcount); + irec->rc_refcount = be32_to_cpu(rec->refc.rc_refcount); + trace_xfs_refcount_get(cur->bc_mp, cur->bc_private.a.agno, + irec); + } + return error; +} + +/* + * Update the record referred to by cur to the value given + * by [bno, len, refcount]. + * This either works (return 0) or gets an EFSCORRUPTED error. + */ +STATIC int +xfs_refcount_update( + struct xfs_btree_cur *cur, + struct xfs_refcount_irec *irec) +{ + union xfs_btree_rec rec; + int error; + + trace_xfs_refcount_update(cur->bc_mp, cur->bc_private.a.agno, irec); + rec.refc.rc_startblock = cpu_to_be32(irec->rc_startblock); + rec.refc.rc_blockcount = cpu_to_be32(irec->rc_blockcount); + rec.refc.rc_refcount = cpu_to_be32(irec->rc_refcount); + error = xfs_btree_update(cur, &rec); + if (error) + trace_xfs_refcount_update_error(cur->bc_mp, + cur->bc_private.a.agno, error, _RET_IP_); + return error; +} + +/* + * Insert the record referred to by cur to the value given + * by [bno, len, refcount]. + * This either works (return 0) or gets an EFSCORRUPTED error. + */ +STATIC int +xfs_refcount_insert( + struct xfs_btree_cur *cur, + struct xfs_refcount_irec *irec, + int *i) +{ + int error; + + trace_xfs_refcount_insert(cur->bc_mp, cur->bc_private.a.agno, irec); + cur->bc_rec.rc.rc_startblock = irec->rc_startblock; + cur->bc_rec.rc.rc_blockcount = irec->rc_blockcount; + cur->bc_rec.rc.rc_refcount = irec->rc_refcount; + error = xfs_btree_insert(cur, i); + XFS_WANT_CORRUPTED_GOTO(cur->bc_mp, *i == 1, out_error); +out_error: + if (error) + trace_xfs_refcount_insert_error(cur->bc_mp, + cur->bc_private.a.agno, error, _RET_IP_); + return error; +} + +/* + * Remove the record referred to by cur, then set the pointer to the spot + * where the record could be re-inserted, in case we want to increment or + * decrement the cursor. + * This either works (return 0) or gets an EFSCORRUPTED error. + */ +STATIC int +xfs_refcount_delete( + struct xfs_btree_cur *cur, + int *i) +{ + struct xfs_refcount_irec irec; + int found_rec; + int error; + + error = xfs_refcount_get_rec(cur, &irec, &found_rec); + if (error) + goto out_error; + XFS_WANT_CORRUPTED_GOTO(cur->bc_mp, found_rec == 1, out_error); + trace_xfs_refcount_delete(cur->bc_mp, cur->bc_private.a.agno, &irec); + error = xfs_btree_delete(cur, i); + XFS_WANT_CORRUPTED_GOTO(cur->bc_mp, *i == 1, out_error); + if (error) + goto out_error; + error = xfs_refcount_lookup_ge(cur, irec.rc_startblock, &found_rec); +out_error: + if (error) + trace_xfs_refcount_delete_error(cur->bc_mp, + cur->bc_private.a.agno, error, _RET_IP_); + return error; +} |