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![Darrick J. Wong](/assets/img/avatar_default.png)
Use the AG btree height limits that we precomputed into the xfs_mount to validate the AG headers instead of using XFS_BTREE_MAXLEVELS. Signed-off-by: Darrick J. Wong <djwong@kernel.org> Reviewed-by: Christoph Hellwig <hch@lst.de>
2971 lines
80 KiB
C
2971 lines
80 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2000-2002,2005 Silicon Graphics, Inc.
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* All Rights Reserved.
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*/
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#include "xfs.h"
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#include "xfs_fs.h"
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#include "xfs_shared.h"
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#include "xfs_format.h"
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#include "xfs_log_format.h"
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#include "xfs_trans_resv.h"
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#include "xfs_bit.h"
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#include "xfs_sb.h"
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#include "xfs_mount.h"
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#include "xfs_inode.h"
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#include "xfs_btree.h"
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#include "xfs_ialloc.h"
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#include "xfs_ialloc_btree.h"
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#include "xfs_alloc.h"
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#include "xfs_errortag.h"
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#include "xfs_error.h"
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#include "xfs_bmap.h"
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#include "xfs_trans.h"
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#include "xfs_buf_item.h"
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#include "xfs_icreate_item.h"
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#include "xfs_icache.h"
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#include "xfs_trace.h"
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#include "xfs_log.h"
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#include "xfs_rmap.h"
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/*
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* Lookup a record by ino in the btree given by cur.
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*/
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int /* error */
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xfs_inobt_lookup(
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struct xfs_btree_cur *cur, /* btree cursor */
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xfs_agino_t ino, /* starting inode of chunk */
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xfs_lookup_t dir, /* <=, >=, == */
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int *stat) /* success/failure */
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{
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cur->bc_rec.i.ir_startino = ino;
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cur->bc_rec.i.ir_holemask = 0;
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cur->bc_rec.i.ir_count = 0;
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cur->bc_rec.i.ir_freecount = 0;
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cur->bc_rec.i.ir_free = 0;
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return xfs_btree_lookup(cur, dir, stat);
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}
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/*
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* Update the record referred to by cur to the value given.
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* This either works (return 0) or gets an EFSCORRUPTED error.
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*/
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STATIC int /* error */
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xfs_inobt_update(
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struct xfs_btree_cur *cur, /* btree cursor */
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xfs_inobt_rec_incore_t *irec) /* btree record */
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{
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union xfs_btree_rec rec;
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rec.inobt.ir_startino = cpu_to_be32(irec->ir_startino);
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if (xfs_sb_version_hassparseinodes(&cur->bc_mp->m_sb)) {
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rec.inobt.ir_u.sp.ir_holemask = cpu_to_be16(irec->ir_holemask);
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rec.inobt.ir_u.sp.ir_count = irec->ir_count;
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rec.inobt.ir_u.sp.ir_freecount = irec->ir_freecount;
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} else {
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/* ir_holemask/ir_count not supported on-disk */
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rec.inobt.ir_u.f.ir_freecount = cpu_to_be32(irec->ir_freecount);
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}
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rec.inobt.ir_free = cpu_to_be64(irec->ir_free);
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return xfs_btree_update(cur, &rec);
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}
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/* Convert on-disk btree record to incore inobt record. */
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void
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xfs_inobt_btrec_to_irec(
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struct xfs_mount *mp,
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union xfs_btree_rec *rec,
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struct xfs_inobt_rec_incore *irec)
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{
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irec->ir_startino = be32_to_cpu(rec->inobt.ir_startino);
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if (xfs_sb_version_hassparseinodes(&mp->m_sb)) {
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irec->ir_holemask = be16_to_cpu(rec->inobt.ir_u.sp.ir_holemask);
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irec->ir_count = rec->inobt.ir_u.sp.ir_count;
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irec->ir_freecount = rec->inobt.ir_u.sp.ir_freecount;
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} else {
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/*
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* ir_holemask/ir_count not supported on-disk. Fill in hardcoded
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* values for full inode chunks.
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*/
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irec->ir_holemask = XFS_INOBT_HOLEMASK_FULL;
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irec->ir_count = XFS_INODES_PER_CHUNK;
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irec->ir_freecount =
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be32_to_cpu(rec->inobt.ir_u.f.ir_freecount);
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}
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irec->ir_free = be64_to_cpu(rec->inobt.ir_free);
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}
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/*
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* Get the data from the pointed-to record.
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*/
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int
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xfs_inobt_get_rec(
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struct xfs_btree_cur *cur,
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struct xfs_inobt_rec_incore *irec,
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int *stat)
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{
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struct xfs_mount *mp = cur->bc_mp;
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xfs_agnumber_t agno = cur->bc_ag.agno;
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union xfs_btree_rec *rec;
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int error;
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uint64_t realfree;
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error = xfs_btree_get_rec(cur, &rec, stat);
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if (error || *stat == 0)
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return error;
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xfs_inobt_btrec_to_irec(mp, rec, irec);
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if (!xfs_verify_agino(mp, agno, irec->ir_startino))
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goto out_bad_rec;
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if (irec->ir_count < XFS_INODES_PER_HOLEMASK_BIT ||
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irec->ir_count > XFS_INODES_PER_CHUNK)
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goto out_bad_rec;
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if (irec->ir_freecount > XFS_INODES_PER_CHUNK)
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goto out_bad_rec;
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/* if there are no holes, return the first available offset */
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if (!xfs_inobt_issparse(irec->ir_holemask))
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realfree = irec->ir_free;
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else
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realfree = irec->ir_free & xfs_inobt_irec_to_allocmask(irec);
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if (hweight64(realfree) != irec->ir_freecount)
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goto out_bad_rec;
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return 0;
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out_bad_rec:
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xfs_warn(mp,
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"%s Inode BTree record corruption in AG %d detected!",
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cur->bc_btnum == XFS_BTNUM_INO ? "Used" : "Free", agno);
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xfs_warn(mp,
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"start inode 0x%x, count 0x%x, free 0x%x freemask 0x%llx, holemask 0x%x",
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irec->ir_startino, irec->ir_count, irec->ir_freecount,
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irec->ir_free, irec->ir_holemask);
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return -EFSCORRUPTED;
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}
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/*
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* Insert a single inobt record. Cursor must already point to desired location.
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*/
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int
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xfs_inobt_insert_rec(
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struct xfs_btree_cur *cur,
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uint16_t holemask,
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uint8_t count,
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int32_t freecount,
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xfs_inofree_t free,
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int *stat)
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{
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cur->bc_rec.i.ir_holemask = holemask;
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cur->bc_rec.i.ir_count = count;
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cur->bc_rec.i.ir_freecount = freecount;
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cur->bc_rec.i.ir_free = free;
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return xfs_btree_insert(cur, stat);
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}
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/*
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* Insert records describing a newly allocated inode chunk into the inobt.
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*/
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STATIC int
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xfs_inobt_insert(
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struct xfs_mount *mp,
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struct xfs_trans *tp,
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struct xfs_buf *agbp,
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xfs_agino_t newino,
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xfs_agino_t newlen,
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xfs_btnum_t btnum)
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{
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struct xfs_btree_cur *cur;
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struct xfs_agi *agi = agbp->b_addr;
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xfs_agnumber_t agno = be32_to_cpu(agi->agi_seqno);
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xfs_agino_t thisino;
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int i;
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int error;
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cur = xfs_inobt_init_cursor(mp, tp, agbp, agno, btnum);
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for (thisino = newino;
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thisino < newino + newlen;
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thisino += XFS_INODES_PER_CHUNK) {
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error = xfs_inobt_lookup(cur, thisino, XFS_LOOKUP_EQ, &i);
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if (error) {
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xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
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return error;
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}
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ASSERT(i == 0);
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error = xfs_inobt_insert_rec(cur, XFS_INOBT_HOLEMASK_FULL,
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XFS_INODES_PER_CHUNK,
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XFS_INODES_PER_CHUNK,
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XFS_INOBT_ALL_FREE, &i);
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if (error) {
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xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
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return error;
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}
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ASSERT(i == 1);
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}
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xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
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return 0;
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}
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/*
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* Verify that the number of free inodes in the AGI is correct.
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*/
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#ifdef DEBUG
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STATIC int
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xfs_check_agi_freecount(
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struct xfs_btree_cur *cur,
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struct xfs_agi *agi)
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{
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if (cur->bc_nlevels == 1) {
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xfs_inobt_rec_incore_t rec;
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int freecount = 0;
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int error;
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int i;
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error = xfs_inobt_lookup(cur, 0, XFS_LOOKUP_GE, &i);
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if (error)
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return error;
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do {
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error = xfs_inobt_get_rec(cur, &rec, &i);
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if (error)
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return error;
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if (i) {
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freecount += rec.ir_freecount;
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error = xfs_btree_increment(cur, 0, &i);
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if (error)
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return error;
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}
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} while (i == 1);
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if (!XFS_FORCED_SHUTDOWN(cur->bc_mp))
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ASSERT(freecount == be32_to_cpu(agi->agi_freecount));
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}
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return 0;
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}
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#else
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#define xfs_check_agi_freecount(cur, agi) 0
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#endif
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/*
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* Initialise a new set of inodes. When called without a transaction context
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* (e.g. from recovery) we initiate a delayed write of the inode buffers rather
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* than logging them (which in a transaction context puts them into the AIL
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* for writeback rather than the xfsbufd queue).
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*/
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int
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xfs_ialloc_inode_init(
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struct xfs_mount *mp,
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struct xfs_trans *tp,
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struct list_head *buffer_list,
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int icount,
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xfs_agnumber_t agno,
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xfs_agblock_t agbno,
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xfs_agblock_t length,
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unsigned int gen)
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{
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struct xfs_buf *fbuf;
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struct xfs_dinode *free;
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int nbufs;
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int version;
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int i, j;
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xfs_daddr_t d;
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xfs_ino_t ino = 0;
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int error;
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/*
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* Loop over the new block(s), filling in the inodes. For small block
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* sizes, manipulate the inodes in buffers which are multiples of the
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* blocks size.
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*/
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nbufs = length / M_IGEO(mp)->blocks_per_cluster;
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/*
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* Figure out what version number to use in the inodes we create. If
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* the superblock version has caught up to the one that supports the new
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* inode format, then use the new inode version. Otherwise use the old
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* version so that old kernels will continue to be able to use the file
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* system.
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*
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* For v3 inodes, we also need to write the inode number into the inode,
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* so calculate the first inode number of the chunk here as
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* XFS_AGB_TO_AGINO() only works within a filesystem block, not
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* across multiple filesystem blocks (such as a cluster) and so cannot
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* be used in the cluster buffer loop below.
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*
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* Further, because we are writing the inode directly into the buffer
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* and calculating a CRC on the entire inode, we have ot log the entire
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* inode so that the entire range the CRC covers is present in the log.
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* That means for v3 inode we log the entire buffer rather than just the
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* inode cores.
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*/
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if (xfs_sb_version_has_v3inode(&mp->m_sb)) {
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version = 3;
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ino = XFS_AGINO_TO_INO(mp, agno, XFS_AGB_TO_AGINO(mp, agbno));
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/*
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* log the initialisation that is about to take place as an
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* logical operation. This means the transaction does not
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* need to log the physical changes to the inode buffers as log
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* recovery will know what initialisation is actually needed.
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* Hence we only need to log the buffers as "ordered" buffers so
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* they track in the AIL as if they were physically logged.
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*/
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if (tp)
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xfs_icreate_log(tp, agno, agbno, icount,
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mp->m_sb.sb_inodesize, length, gen);
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} else
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version = 2;
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for (j = 0; j < nbufs; j++) {
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/*
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* Get the block.
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*/
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d = XFS_AGB_TO_DADDR(mp, agno, agbno +
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(j * M_IGEO(mp)->blocks_per_cluster));
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error = xfs_trans_get_buf(tp, mp->m_ddev_targp, d,
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mp->m_bsize * M_IGEO(mp)->blocks_per_cluster,
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XBF_UNMAPPED, &fbuf);
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if (error)
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return error;
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/* Initialize the inode buffers and log them appropriately. */
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fbuf->b_ops = &xfs_inode_buf_ops;
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xfs_buf_zero(fbuf, 0, BBTOB(fbuf->b_length));
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for (i = 0; i < M_IGEO(mp)->inodes_per_cluster; i++) {
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int ioffset = i << mp->m_sb.sb_inodelog;
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uint isize = XFS_DINODE_SIZE(&mp->m_sb);
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free = xfs_make_iptr(mp, fbuf, i);
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free->di_magic = cpu_to_be16(XFS_DINODE_MAGIC);
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free->di_version = version;
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free->di_gen = cpu_to_be32(gen);
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free->di_next_unlinked = cpu_to_be32(NULLAGINO);
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if (version == 3) {
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free->di_ino = cpu_to_be64(ino);
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ino++;
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uuid_copy(&free->di_uuid,
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&mp->m_sb.sb_meta_uuid);
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xfs_dinode_calc_crc(mp, free);
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} else if (tp) {
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/* just log the inode core */
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xfs_trans_log_buf(tp, fbuf, ioffset,
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ioffset + isize - 1);
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}
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}
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if (tp) {
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/*
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* Mark the buffer as an inode allocation buffer so it
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* sticks in AIL at the point of this allocation
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* transaction. This ensures the they are on disk before
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* the tail of the log can be moved past this
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* transaction (i.e. by preventing relogging from moving
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* it forward in the log).
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*/
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xfs_trans_inode_alloc_buf(tp, fbuf);
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if (version == 3) {
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/*
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* Mark the buffer as ordered so that they are
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* not physically logged in the transaction but
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* still tracked in the AIL as part of the
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* transaction and pin the log appropriately.
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*/
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xfs_trans_ordered_buf(tp, fbuf);
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}
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} else {
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fbuf->b_flags |= XBF_DONE;
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xfs_buf_delwri_queue(fbuf, buffer_list);
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xfs_buf_relse(fbuf);
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}
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}
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return 0;
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}
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/*
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* Align startino and allocmask for a recently allocated sparse chunk such that
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* they are fit for insertion (or merge) into the on-disk inode btrees.
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*
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* Background:
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*
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* When enabled, sparse inode support increases the inode alignment from cluster
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* size to inode chunk size. This means that the minimum range between two
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* non-adjacent inode records in the inobt is large enough for a full inode
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* record. This allows for cluster sized, cluster aligned block allocation
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* without need to worry about whether the resulting inode record overlaps with
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* another record in the tree. Without this basic rule, we would have to deal
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* with the consequences of overlap by potentially undoing recent allocations in
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* the inode allocation codepath.
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*
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* Because of this alignment rule (which is enforced on mount), there are two
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* inobt possibilities for newly allocated sparse chunks. One is that the
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* aligned inode record for the chunk covers a range of inodes not already
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* covered in the inobt (i.e., it is safe to insert a new sparse record). The
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* other is that a record already exists at the aligned startino that considers
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* the newly allocated range as sparse. In the latter case, record content is
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* merged in hope that sparse inode chunks fill to full chunks over time.
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*/
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STATIC void
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xfs_align_sparse_ino(
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struct xfs_mount *mp,
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xfs_agino_t *startino,
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uint16_t *allocmask)
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{
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xfs_agblock_t agbno;
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xfs_agblock_t mod;
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int offset;
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agbno = XFS_AGINO_TO_AGBNO(mp, *startino);
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mod = agbno % mp->m_sb.sb_inoalignmt;
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if (!mod)
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return;
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/* calculate the inode offset and align startino */
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offset = XFS_AGB_TO_AGINO(mp, mod);
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*startino -= offset;
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/*
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* Since startino has been aligned down, left shift allocmask such that
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* it continues to represent the same physical inodes relative to the
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* new startino.
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*/
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*allocmask <<= offset / XFS_INODES_PER_HOLEMASK_BIT;
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}
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/*
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* Determine whether the source inode record can merge into the target. Both
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* records must be sparse, the inode ranges must match and there must be no
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* allocation overlap between the records.
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*/
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STATIC bool
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__xfs_inobt_can_merge(
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struct xfs_inobt_rec_incore *trec, /* tgt record */
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struct xfs_inobt_rec_incore *srec) /* src record */
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{
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uint64_t talloc;
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uint64_t salloc;
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/* records must cover the same inode range */
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if (trec->ir_startino != srec->ir_startino)
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return false;
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|
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/* both records must be sparse */
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if (!xfs_inobt_issparse(trec->ir_holemask) ||
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!xfs_inobt_issparse(srec->ir_holemask))
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return false;
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|
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/* both records must track some inodes */
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|
if (!trec->ir_count || !srec->ir_count)
|
|
return false;
|
|
|
|
/* can't exceed capacity of a full record */
|
|
if (trec->ir_count + srec->ir_count > XFS_INODES_PER_CHUNK)
|
|
return false;
|
|
|
|
/* verify there is no allocation overlap */
|
|
talloc = xfs_inobt_irec_to_allocmask(trec);
|
|
salloc = xfs_inobt_irec_to_allocmask(srec);
|
|
if (talloc & salloc)
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
/*
|
|
* Merge the source inode record into the target. The caller must call
|
|
* __xfs_inobt_can_merge() to ensure the merge is valid.
|
|
*/
|
|
STATIC void
|
|
__xfs_inobt_rec_merge(
|
|
struct xfs_inobt_rec_incore *trec, /* target */
|
|
struct xfs_inobt_rec_incore *srec) /* src */
|
|
{
|
|
ASSERT(trec->ir_startino == srec->ir_startino);
|
|
|
|
/* combine the counts */
|
|
trec->ir_count += srec->ir_count;
|
|
trec->ir_freecount += srec->ir_freecount;
|
|
|
|
/*
|
|
* Merge the holemask and free mask. For both fields, 0 bits refer to
|
|
* allocated inodes. We combine the allocated ranges with bitwise AND.
|
|
*/
|
|
trec->ir_holemask &= srec->ir_holemask;
|
|
trec->ir_free &= srec->ir_free;
|
|
}
|
|
|
|
/*
|
|
* Insert a new sparse inode chunk into the associated inode btree. The inode
|
|
* record for the sparse chunk is pre-aligned to a startino that should match
|
|
* any pre-existing sparse inode record in the tree. This allows sparse chunks
|
|
* to fill over time.
|
|
*
|
|
* This function supports two modes of handling preexisting records depending on
|
|
* the merge flag. If merge is true, the provided record is merged with the
|
|
* existing record and updated in place. The merged record is returned in nrec.
|
|
* If merge is false, an existing record is replaced with the provided record.
|
|
* If no preexisting record exists, the provided record is always inserted.
|
|
*
|
|
* It is considered corruption if a merge is requested and not possible. Given
|
|
* the sparse inode alignment constraints, this should never happen.
|
|
*/
|
|
STATIC int
|
|
xfs_inobt_insert_sprec(
|
|
struct xfs_mount *mp,
|
|
struct xfs_trans *tp,
|
|
struct xfs_buf *agbp,
|
|
int btnum,
|
|
struct xfs_inobt_rec_incore *nrec, /* in/out: new/merged rec. */
|
|
bool merge) /* merge or replace */
|
|
{
|
|
struct xfs_btree_cur *cur;
|
|
struct xfs_agi *agi = agbp->b_addr;
|
|
xfs_agnumber_t agno = be32_to_cpu(agi->agi_seqno);
|
|
int error;
|
|
int i;
|
|
struct xfs_inobt_rec_incore rec;
|
|
|
|
cur = xfs_inobt_init_cursor(mp, tp, agbp, agno, btnum);
|
|
|
|
/* the new record is pre-aligned so we know where to look */
|
|
error = xfs_inobt_lookup(cur, nrec->ir_startino, XFS_LOOKUP_EQ, &i);
|
|
if (error)
|
|
goto error;
|
|
/* if nothing there, insert a new record and return */
|
|
if (i == 0) {
|
|
error = xfs_inobt_insert_rec(cur, nrec->ir_holemask,
|
|
nrec->ir_count, nrec->ir_freecount,
|
|
nrec->ir_free, &i);
|
|
if (error)
|
|
goto error;
|
|
if (XFS_IS_CORRUPT(mp, i != 1)) {
|
|
error = -EFSCORRUPTED;
|
|
goto error;
|
|
}
|
|
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* A record exists at this startino. Merge or replace the record
|
|
* depending on what we've been asked to do.
|
|
*/
|
|
if (merge) {
|
|
error = xfs_inobt_get_rec(cur, &rec, &i);
|
|
if (error)
|
|
goto error;
|
|
if (XFS_IS_CORRUPT(mp, i != 1)) {
|
|
error = -EFSCORRUPTED;
|
|
goto error;
|
|
}
|
|
if (XFS_IS_CORRUPT(mp, rec.ir_startino != nrec->ir_startino)) {
|
|
error = -EFSCORRUPTED;
|
|
goto error;
|
|
}
|
|
|
|
/*
|
|
* This should never fail. If we have coexisting records that
|
|
* cannot merge, something is seriously wrong.
|
|
*/
|
|
if (XFS_IS_CORRUPT(mp, !__xfs_inobt_can_merge(nrec, &rec))) {
|
|
error = -EFSCORRUPTED;
|
|
goto error;
|
|
}
|
|
|
|
trace_xfs_irec_merge_pre(mp, agno, rec.ir_startino,
|
|
rec.ir_holemask, nrec->ir_startino,
|
|
nrec->ir_holemask);
|
|
|
|
/* merge to nrec to output the updated record */
|
|
__xfs_inobt_rec_merge(nrec, &rec);
|
|
|
|
trace_xfs_irec_merge_post(mp, agno, nrec->ir_startino,
|
|
nrec->ir_holemask);
|
|
|
|
error = xfs_inobt_rec_check_count(mp, nrec);
|
|
if (error)
|
|
goto error;
|
|
}
|
|
|
|
error = xfs_inobt_update(cur, nrec);
|
|
if (error)
|
|
goto error;
|
|
|
|
out:
|
|
xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
|
|
return 0;
|
|
error:
|
|
xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Allocate new inodes in the allocation group specified by agbp.
|
|
* Returns 0 if inodes were allocated in this AG; 1 if there was no space
|
|
* in this AG; or the usual negative error code.
|
|
*/
|
|
STATIC int
|
|
xfs_ialloc_ag_alloc(
|
|
struct xfs_trans *tp,
|
|
struct xfs_buf *agbp)
|
|
{
|
|
struct xfs_agi *agi;
|
|
struct xfs_alloc_arg args;
|
|
xfs_agnumber_t agno;
|
|
int error;
|
|
xfs_agino_t newino; /* new first inode's number */
|
|
xfs_agino_t newlen; /* new number of inodes */
|
|
int isaligned = 0; /* inode allocation at stripe */
|
|
/* unit boundary */
|
|
/* init. to full chunk */
|
|
uint16_t allocmask = (uint16_t) -1;
|
|
struct xfs_inobt_rec_incore rec;
|
|
struct xfs_perag *pag;
|
|
struct xfs_ino_geometry *igeo = M_IGEO(tp->t_mountp);
|
|
int do_sparse = 0;
|
|
|
|
memset(&args, 0, sizeof(args));
|
|
args.tp = tp;
|
|
args.mp = tp->t_mountp;
|
|
args.fsbno = NULLFSBLOCK;
|
|
args.oinfo = XFS_RMAP_OINFO_INODES;
|
|
|
|
#ifdef DEBUG
|
|
/* randomly do sparse inode allocations */
|
|
if (xfs_sb_version_hassparseinodes(&tp->t_mountp->m_sb) &&
|
|
igeo->ialloc_min_blks < igeo->ialloc_blks)
|
|
do_sparse = prandom_u32() & 1;
|
|
#endif
|
|
|
|
/*
|
|
* Locking will ensure that we don't have two callers in here
|
|
* at one time.
|
|
*/
|
|
newlen = igeo->ialloc_inos;
|
|
if (igeo->maxicount &&
|
|
percpu_counter_read_positive(&args.mp->m_icount) + newlen >
|
|
igeo->maxicount)
|
|
return -ENOSPC;
|
|
args.minlen = args.maxlen = igeo->ialloc_blks;
|
|
/*
|
|
* First try to allocate inodes contiguous with the last-allocated
|
|
* chunk of inodes. If the filesystem is striped, this will fill
|
|
* an entire stripe unit with inodes.
|
|
*/
|
|
agi = agbp->b_addr;
|
|
newino = be32_to_cpu(agi->agi_newino);
|
|
agno = be32_to_cpu(agi->agi_seqno);
|
|
args.agbno = XFS_AGINO_TO_AGBNO(args.mp, newino) +
|
|
igeo->ialloc_blks;
|
|
if (do_sparse)
|
|
goto sparse_alloc;
|
|
if (likely(newino != NULLAGINO &&
|
|
(args.agbno < be32_to_cpu(agi->agi_length)))) {
|
|
args.fsbno = XFS_AGB_TO_FSB(args.mp, agno, args.agbno);
|
|
args.type = XFS_ALLOCTYPE_THIS_BNO;
|
|
args.prod = 1;
|
|
|
|
/*
|
|
* We need to take into account alignment here to ensure that
|
|
* we don't modify the free list if we fail to have an exact
|
|
* block. If we don't have an exact match, and every oher
|
|
* attempt allocation attempt fails, we'll end up cancelling
|
|
* a dirty transaction and shutting down.
|
|
*
|
|
* For an exact allocation, alignment must be 1,
|
|
* however we need to take cluster alignment into account when
|
|
* fixing up the freelist. Use the minalignslop field to
|
|
* indicate that extra blocks might be required for alignment,
|
|
* but not to use them in the actual exact allocation.
|
|
*/
|
|
args.alignment = 1;
|
|
args.minalignslop = igeo->cluster_align - 1;
|
|
|
|
/* Allow space for the inode btree to split. */
|
|
args.minleft = igeo->inobt_maxlevels;
|
|
if ((error = xfs_alloc_vextent(&args)))
|
|
return error;
|
|
|
|
/*
|
|
* This request might have dirtied the transaction if the AG can
|
|
* satisfy the request, but the exact block was not available.
|
|
* If the allocation did fail, subsequent requests will relax
|
|
* the exact agbno requirement and increase the alignment
|
|
* instead. It is critical that the total size of the request
|
|
* (len + alignment + slop) does not increase from this point
|
|
* on, so reset minalignslop to ensure it is not included in
|
|
* subsequent requests.
|
|
*/
|
|
args.minalignslop = 0;
|
|
}
|
|
|
|
if (unlikely(args.fsbno == NULLFSBLOCK)) {
|
|
/*
|
|
* Set the alignment for the allocation.
|
|
* If stripe alignment is turned on then align at stripe unit
|
|
* boundary.
|
|
* If the cluster size is smaller than a filesystem block
|
|
* then we're doing I/O for inodes in filesystem block size
|
|
* pieces, so don't need alignment anyway.
|
|
*/
|
|
isaligned = 0;
|
|
if (igeo->ialloc_align) {
|
|
ASSERT(!(args.mp->m_flags & XFS_MOUNT_NOALIGN));
|
|
args.alignment = args.mp->m_dalign;
|
|
isaligned = 1;
|
|
} else
|
|
args.alignment = igeo->cluster_align;
|
|
/*
|
|
* Need to figure out where to allocate the inode blocks.
|
|
* Ideally they should be spaced out through the a.g.
|
|
* For now, just allocate blocks up front.
|
|
*/
|
|
args.agbno = be32_to_cpu(agi->agi_root);
|
|
args.fsbno = XFS_AGB_TO_FSB(args.mp, agno, args.agbno);
|
|
/*
|
|
* Allocate a fixed-size extent of inodes.
|
|
*/
|
|
args.type = XFS_ALLOCTYPE_NEAR_BNO;
|
|
args.prod = 1;
|
|
/*
|
|
* Allow space for the inode btree to split.
|
|
*/
|
|
args.minleft = igeo->inobt_maxlevels;
|
|
if ((error = xfs_alloc_vextent(&args)))
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* If stripe alignment is turned on, then try again with cluster
|
|
* alignment.
|
|
*/
|
|
if (isaligned && args.fsbno == NULLFSBLOCK) {
|
|
args.type = XFS_ALLOCTYPE_NEAR_BNO;
|
|
args.agbno = be32_to_cpu(agi->agi_root);
|
|
args.fsbno = XFS_AGB_TO_FSB(args.mp, agno, args.agbno);
|
|
args.alignment = igeo->cluster_align;
|
|
if ((error = xfs_alloc_vextent(&args)))
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Finally, try a sparse allocation if the filesystem supports it and
|
|
* the sparse allocation length is smaller than a full chunk.
|
|
*/
|
|
if (xfs_sb_version_hassparseinodes(&args.mp->m_sb) &&
|
|
igeo->ialloc_min_blks < igeo->ialloc_blks &&
|
|
args.fsbno == NULLFSBLOCK) {
|
|
sparse_alloc:
|
|
args.type = XFS_ALLOCTYPE_NEAR_BNO;
|
|
args.agbno = be32_to_cpu(agi->agi_root);
|
|
args.fsbno = XFS_AGB_TO_FSB(args.mp, agno, args.agbno);
|
|
args.alignment = args.mp->m_sb.sb_spino_align;
|
|
args.prod = 1;
|
|
|
|
args.minlen = igeo->ialloc_min_blks;
|
|
args.maxlen = args.minlen;
|
|
|
|
/*
|
|
* The inode record will be aligned to full chunk size. We must
|
|
* prevent sparse allocation from AG boundaries that result in
|
|
* invalid inode records, such as records that start at agbno 0
|
|
* or extend beyond the AG.
|
|
*
|
|
* Set min agbno to the first aligned, non-zero agbno and max to
|
|
* the last aligned agbno that is at least one full chunk from
|
|
* the end of the AG.
|
|
*/
|
|
args.min_agbno = args.mp->m_sb.sb_inoalignmt;
|
|
args.max_agbno = round_down(args.mp->m_sb.sb_agblocks,
|
|
args.mp->m_sb.sb_inoalignmt) -
|
|
igeo->ialloc_blks;
|
|
|
|
error = xfs_alloc_vextent(&args);
|
|
if (error)
|
|
return error;
|
|
|
|
newlen = XFS_AGB_TO_AGINO(args.mp, args.len);
|
|
ASSERT(newlen <= XFS_INODES_PER_CHUNK);
|
|
allocmask = (1 << (newlen / XFS_INODES_PER_HOLEMASK_BIT)) - 1;
|
|
}
|
|
|
|
if (args.fsbno == NULLFSBLOCK)
|
|
return 1;
|
|
|
|
ASSERT(args.len == args.minlen);
|
|
|
|
/*
|
|
* Stamp and write the inode buffers.
|
|
*
|
|
* Seed the new inode cluster with a random generation number. This
|
|
* prevents short-term reuse of generation numbers if a chunk is
|
|
* freed and then immediately reallocated. We use random numbers
|
|
* rather than a linear progression to prevent the next generation
|
|
* number from being easily guessable.
|
|
*/
|
|
error = xfs_ialloc_inode_init(args.mp, tp, NULL, newlen, agno,
|
|
args.agbno, args.len, prandom_u32());
|
|
|
|
if (error)
|
|
return error;
|
|
/*
|
|
* Convert the results.
|
|
*/
|
|
newino = XFS_AGB_TO_AGINO(args.mp, args.agbno);
|
|
|
|
if (xfs_inobt_issparse(~allocmask)) {
|
|
/*
|
|
* We've allocated a sparse chunk. Align the startino and mask.
|
|
*/
|
|
xfs_align_sparse_ino(args.mp, &newino, &allocmask);
|
|
|
|
rec.ir_startino = newino;
|
|
rec.ir_holemask = ~allocmask;
|
|
rec.ir_count = newlen;
|
|
rec.ir_freecount = newlen;
|
|
rec.ir_free = XFS_INOBT_ALL_FREE;
|
|
|
|
/*
|
|
* Insert the sparse record into the inobt and allow for a merge
|
|
* if necessary. If a merge does occur, rec is updated to the
|
|
* merged record.
|
|
*/
|
|
error = xfs_inobt_insert_sprec(args.mp, tp, agbp, XFS_BTNUM_INO,
|
|
&rec, true);
|
|
if (error == -EFSCORRUPTED) {
|
|
xfs_alert(args.mp,
|
|
"invalid sparse inode record: ino 0x%llx holemask 0x%x count %u",
|
|
XFS_AGINO_TO_INO(args.mp, agno,
|
|
rec.ir_startino),
|
|
rec.ir_holemask, rec.ir_count);
|
|
xfs_force_shutdown(args.mp, SHUTDOWN_CORRUPT_INCORE);
|
|
}
|
|
if (error)
|
|
return error;
|
|
|
|
/*
|
|
* We can't merge the part we've just allocated as for the inobt
|
|
* due to finobt semantics. The original record may or may not
|
|
* exist independent of whether physical inodes exist in this
|
|
* sparse chunk.
|
|
*
|
|
* We must update the finobt record based on the inobt record.
|
|
* rec contains the fully merged and up to date inobt record
|
|
* from the previous call. Set merge false to replace any
|
|
* existing record with this one.
|
|
*/
|
|
if (xfs_sb_version_hasfinobt(&args.mp->m_sb)) {
|
|
error = xfs_inobt_insert_sprec(args.mp, tp, agbp,
|
|
XFS_BTNUM_FINO, &rec,
|
|
false);
|
|
if (error)
|
|
return error;
|
|
}
|
|
} else {
|
|
/* full chunk - insert new records to both btrees */
|
|
error = xfs_inobt_insert(args.mp, tp, agbp, newino, newlen,
|
|
XFS_BTNUM_INO);
|
|
if (error)
|
|
return error;
|
|
|
|
if (xfs_sb_version_hasfinobt(&args.mp->m_sb)) {
|
|
error = xfs_inobt_insert(args.mp, tp, agbp, newino,
|
|
newlen, XFS_BTNUM_FINO);
|
|
if (error)
|
|
return error;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Update AGI counts and newino.
|
|
*/
|
|
be32_add_cpu(&agi->agi_count, newlen);
|
|
be32_add_cpu(&agi->agi_freecount, newlen);
|
|
pag = agbp->b_pag;
|
|
pag->pagi_freecount += newlen;
|
|
pag->pagi_count += newlen;
|
|
agi->agi_newino = cpu_to_be32(newino);
|
|
|
|
/*
|
|
* Log allocation group header fields
|
|
*/
|
|
xfs_ialloc_log_agi(tp, agbp,
|
|
XFS_AGI_COUNT | XFS_AGI_FREECOUNT | XFS_AGI_NEWINO);
|
|
/*
|
|
* Modify/log superblock values for inode count and inode free count.
|
|
*/
|
|
xfs_trans_mod_sb(tp, XFS_TRANS_SB_ICOUNT, (long)newlen);
|
|
xfs_trans_mod_sb(tp, XFS_TRANS_SB_IFREE, (long)newlen);
|
|
return 0;
|
|
}
|
|
|
|
STATIC xfs_agnumber_t
|
|
xfs_ialloc_next_ag(
|
|
xfs_mount_t *mp)
|
|
{
|
|
xfs_agnumber_t agno;
|
|
|
|
spin_lock(&mp->m_agirotor_lock);
|
|
agno = mp->m_agirotor;
|
|
if (++mp->m_agirotor >= mp->m_maxagi)
|
|
mp->m_agirotor = 0;
|
|
spin_unlock(&mp->m_agirotor_lock);
|
|
|
|
return agno;
|
|
}
|
|
|
|
/*
|
|
* Select an allocation group to look for a free inode in, based on the parent
|
|
* inode and the mode. Return the allocation group buffer.
|
|
*/
|
|
STATIC xfs_agnumber_t
|
|
xfs_ialloc_ag_select(
|
|
xfs_trans_t *tp, /* transaction pointer */
|
|
xfs_ino_t parent, /* parent directory inode number */
|
|
umode_t mode) /* bits set to indicate file type */
|
|
{
|
|
xfs_agnumber_t agcount; /* number of ag's in the filesystem */
|
|
xfs_agnumber_t agno; /* current ag number */
|
|
int flags; /* alloc buffer locking flags */
|
|
xfs_extlen_t ineed; /* blocks needed for inode allocation */
|
|
xfs_extlen_t longest = 0; /* longest extent available */
|
|
xfs_mount_t *mp; /* mount point structure */
|
|
int needspace; /* file mode implies space allocated */
|
|
xfs_perag_t *pag; /* per allocation group data */
|
|
xfs_agnumber_t pagno; /* parent (starting) ag number */
|
|
int error;
|
|
|
|
/*
|
|
* Files of these types need at least one block if length > 0
|
|
* (and they won't fit in the inode, but that's hard to figure out).
|
|
*/
|
|
needspace = S_ISDIR(mode) || S_ISREG(mode) || S_ISLNK(mode);
|
|
mp = tp->t_mountp;
|
|
agcount = mp->m_maxagi;
|
|
if (S_ISDIR(mode))
|
|
pagno = xfs_ialloc_next_ag(mp);
|
|
else {
|
|
pagno = XFS_INO_TO_AGNO(mp, parent);
|
|
if (pagno >= agcount)
|
|
pagno = 0;
|
|
}
|
|
|
|
ASSERT(pagno < agcount);
|
|
|
|
/*
|
|
* Loop through allocation groups, looking for one with a little
|
|
* free space in it. Note we don't look for free inodes, exactly.
|
|
* Instead, we include whether there is a need to allocate inodes
|
|
* to mean that blocks must be allocated for them,
|
|
* if none are currently free.
|
|
*/
|
|
agno = pagno;
|
|
flags = XFS_ALLOC_FLAG_TRYLOCK;
|
|
for (;;) {
|
|
pag = xfs_perag_get(mp, agno);
|
|
if (!pag->pagi_inodeok) {
|
|
xfs_ialloc_next_ag(mp);
|
|
goto nextag;
|
|
}
|
|
|
|
if (!pag->pagi_init) {
|
|
error = xfs_ialloc_pagi_init(mp, tp, agno);
|
|
if (error)
|
|
goto nextag;
|
|
}
|
|
|
|
if (pag->pagi_freecount) {
|
|
xfs_perag_put(pag);
|
|
return agno;
|
|
}
|
|
|
|
if (!pag->pagf_init) {
|
|
error = xfs_alloc_pagf_init(mp, tp, agno, flags);
|
|
if (error)
|
|
goto nextag;
|
|
}
|
|
|
|
/*
|
|
* Check that there is enough free space for the file plus a
|
|
* chunk of inodes if we need to allocate some. If this is the
|
|
* first pass across the AGs, take into account the potential
|
|
* space needed for alignment of inode chunks when checking the
|
|
* longest contiguous free space in the AG - this prevents us
|
|
* from getting ENOSPC because we have free space larger than
|
|
* ialloc_blks but alignment constraints prevent us from using
|
|
* it.
|
|
*
|
|
* If we can't find an AG with space for full alignment slack to
|
|
* be taken into account, we must be near ENOSPC in all AGs.
|
|
* Hence we don't include alignment for the second pass and so
|
|
* if we fail allocation due to alignment issues then it is most
|
|
* likely a real ENOSPC condition.
|
|
*/
|
|
ineed = M_IGEO(mp)->ialloc_min_blks;
|
|
if (flags && ineed > 1)
|
|
ineed += M_IGEO(mp)->cluster_align;
|
|
longest = pag->pagf_longest;
|
|
if (!longest)
|
|
longest = pag->pagf_flcount > 0;
|
|
|
|
if (pag->pagf_freeblks >= needspace + ineed &&
|
|
longest >= ineed) {
|
|
xfs_perag_put(pag);
|
|
return agno;
|
|
}
|
|
nextag:
|
|
xfs_perag_put(pag);
|
|
/*
|
|
* No point in iterating over the rest, if we're shutting
|
|
* down.
|
|
*/
|
|
if (XFS_FORCED_SHUTDOWN(mp))
|
|
return NULLAGNUMBER;
|
|
agno++;
|
|
if (agno >= agcount)
|
|
agno = 0;
|
|
if (agno == pagno) {
|
|
if (flags == 0)
|
|
return NULLAGNUMBER;
|
|
flags = 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Try to retrieve the next record to the left/right from the current one.
|
|
*/
|
|
STATIC int
|
|
xfs_ialloc_next_rec(
|
|
struct xfs_btree_cur *cur,
|
|
xfs_inobt_rec_incore_t *rec,
|
|
int *done,
|
|
int left)
|
|
{
|
|
int error;
|
|
int i;
|
|
|
|
if (left)
|
|
error = xfs_btree_decrement(cur, 0, &i);
|
|
else
|
|
error = xfs_btree_increment(cur, 0, &i);
|
|
|
|
if (error)
|
|
return error;
|
|
*done = !i;
|
|
if (i) {
|
|
error = xfs_inobt_get_rec(cur, rec, &i);
|
|
if (error)
|
|
return error;
|
|
if (XFS_IS_CORRUPT(cur->bc_mp, i != 1))
|
|
return -EFSCORRUPTED;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
STATIC int
|
|
xfs_ialloc_get_rec(
|
|
struct xfs_btree_cur *cur,
|
|
xfs_agino_t agino,
|
|
xfs_inobt_rec_incore_t *rec,
|
|
int *done)
|
|
{
|
|
int error;
|
|
int i;
|
|
|
|
error = xfs_inobt_lookup(cur, agino, XFS_LOOKUP_EQ, &i);
|
|
if (error)
|
|
return error;
|
|
*done = !i;
|
|
if (i) {
|
|
error = xfs_inobt_get_rec(cur, rec, &i);
|
|
if (error)
|
|
return error;
|
|
if (XFS_IS_CORRUPT(cur->bc_mp, i != 1))
|
|
return -EFSCORRUPTED;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Return the offset of the first free inode in the record. If the inode chunk
|
|
* is sparsely allocated, we convert the record holemask to inode granularity
|
|
* and mask off the unallocated regions from the inode free mask.
|
|
*/
|
|
STATIC int
|
|
xfs_inobt_first_free_inode(
|
|
struct xfs_inobt_rec_incore *rec)
|
|
{
|
|
xfs_inofree_t realfree;
|
|
|
|
/* if there are no holes, return the first available offset */
|
|
if (!xfs_inobt_issparse(rec->ir_holemask))
|
|
return xfs_lowbit64(rec->ir_free);
|
|
|
|
realfree = xfs_inobt_irec_to_allocmask(rec);
|
|
realfree &= rec->ir_free;
|
|
|
|
return xfs_lowbit64(realfree);
|
|
}
|
|
|
|
/*
|
|
* Allocate an inode using the inobt-only algorithm.
|
|
*/
|
|
STATIC int
|
|
xfs_dialloc_ag_inobt(
|
|
struct xfs_trans *tp,
|
|
struct xfs_buf *agbp,
|
|
xfs_ino_t parent,
|
|
xfs_ino_t *inop)
|
|
{
|
|
struct xfs_mount *mp = tp->t_mountp;
|
|
struct xfs_agi *agi = agbp->b_addr;
|
|
xfs_agnumber_t agno = be32_to_cpu(agi->agi_seqno);
|
|
xfs_agnumber_t pagno = XFS_INO_TO_AGNO(mp, parent);
|
|
xfs_agino_t pagino = XFS_INO_TO_AGINO(mp, parent);
|
|
struct xfs_perag *pag = agbp->b_pag;
|
|
struct xfs_btree_cur *cur, *tcur;
|
|
struct xfs_inobt_rec_incore rec, trec;
|
|
xfs_ino_t ino;
|
|
int error;
|
|
int offset;
|
|
int i, j;
|
|
int searchdistance = 10;
|
|
|
|
ASSERT(pag->pagi_init);
|
|
ASSERT(pag->pagi_inodeok);
|
|
ASSERT(pag->pagi_freecount > 0);
|
|
|
|
restart_pagno:
|
|
cur = xfs_inobt_init_cursor(mp, tp, agbp, agno, XFS_BTNUM_INO);
|
|
/*
|
|
* If pagino is 0 (this is the root inode allocation) use newino.
|
|
* This must work because we've just allocated some.
|
|
*/
|
|
if (!pagino)
|
|
pagino = be32_to_cpu(agi->agi_newino);
|
|
|
|
error = xfs_check_agi_freecount(cur, agi);
|
|
if (error)
|
|
goto error0;
|
|
|
|
/*
|
|
* If in the same AG as the parent, try to get near the parent.
|
|
*/
|
|
if (pagno == agno) {
|
|
int doneleft; /* done, to the left */
|
|
int doneright; /* done, to the right */
|
|
|
|
error = xfs_inobt_lookup(cur, pagino, XFS_LOOKUP_LE, &i);
|
|
if (error)
|
|
goto error0;
|
|
if (XFS_IS_CORRUPT(mp, i != 1)) {
|
|
error = -EFSCORRUPTED;
|
|
goto error0;
|
|
}
|
|
|
|
error = xfs_inobt_get_rec(cur, &rec, &j);
|
|
if (error)
|
|
goto error0;
|
|
if (XFS_IS_CORRUPT(mp, j != 1)) {
|
|
error = -EFSCORRUPTED;
|
|
goto error0;
|
|
}
|
|
|
|
if (rec.ir_freecount > 0) {
|
|
/*
|
|
* Found a free inode in the same chunk
|
|
* as the parent, done.
|
|
*/
|
|
goto alloc_inode;
|
|
}
|
|
|
|
|
|
/*
|
|
* In the same AG as parent, but parent's chunk is full.
|
|
*/
|
|
|
|
/* duplicate the cursor, search left & right simultaneously */
|
|
error = xfs_btree_dup_cursor(cur, &tcur);
|
|
if (error)
|
|
goto error0;
|
|
|
|
/*
|
|
* Skip to last blocks looked up if same parent inode.
|
|
*/
|
|
if (pagino != NULLAGINO &&
|
|
pag->pagl_pagino == pagino &&
|
|
pag->pagl_leftrec != NULLAGINO &&
|
|
pag->pagl_rightrec != NULLAGINO) {
|
|
error = xfs_ialloc_get_rec(tcur, pag->pagl_leftrec,
|
|
&trec, &doneleft);
|
|
if (error)
|
|
goto error1;
|
|
|
|
error = xfs_ialloc_get_rec(cur, pag->pagl_rightrec,
|
|
&rec, &doneright);
|
|
if (error)
|
|
goto error1;
|
|
} else {
|
|
/* search left with tcur, back up 1 record */
|
|
error = xfs_ialloc_next_rec(tcur, &trec, &doneleft, 1);
|
|
if (error)
|
|
goto error1;
|
|
|
|
/* search right with cur, go forward 1 record. */
|
|
error = xfs_ialloc_next_rec(cur, &rec, &doneright, 0);
|
|
if (error)
|
|
goto error1;
|
|
}
|
|
|
|
/*
|
|
* Loop until we find an inode chunk with a free inode.
|
|
*/
|
|
while (--searchdistance > 0 && (!doneleft || !doneright)) {
|
|
int useleft; /* using left inode chunk this time */
|
|
|
|
/* figure out the closer block if both are valid. */
|
|
if (!doneleft && !doneright) {
|
|
useleft = pagino -
|
|
(trec.ir_startino + XFS_INODES_PER_CHUNK - 1) <
|
|
rec.ir_startino - pagino;
|
|
} else {
|
|
useleft = !doneleft;
|
|
}
|
|
|
|
/* free inodes to the left? */
|
|
if (useleft && trec.ir_freecount) {
|
|
xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
|
|
cur = tcur;
|
|
|
|
pag->pagl_leftrec = trec.ir_startino;
|
|
pag->pagl_rightrec = rec.ir_startino;
|
|
pag->pagl_pagino = pagino;
|
|
rec = trec;
|
|
goto alloc_inode;
|
|
}
|
|
|
|
/* free inodes to the right? */
|
|
if (!useleft && rec.ir_freecount) {
|
|
xfs_btree_del_cursor(tcur, XFS_BTREE_NOERROR);
|
|
|
|
pag->pagl_leftrec = trec.ir_startino;
|
|
pag->pagl_rightrec = rec.ir_startino;
|
|
pag->pagl_pagino = pagino;
|
|
goto alloc_inode;
|
|
}
|
|
|
|
/* get next record to check */
|
|
if (useleft) {
|
|
error = xfs_ialloc_next_rec(tcur, &trec,
|
|
&doneleft, 1);
|
|
} else {
|
|
error = xfs_ialloc_next_rec(cur, &rec,
|
|
&doneright, 0);
|
|
}
|
|
if (error)
|
|
goto error1;
|
|
}
|
|
|
|
if (searchdistance <= 0) {
|
|
/*
|
|
* Not in range - save last search
|
|
* location and allocate a new inode
|
|
*/
|
|
xfs_btree_del_cursor(tcur, XFS_BTREE_NOERROR);
|
|
pag->pagl_leftrec = trec.ir_startino;
|
|
pag->pagl_rightrec = rec.ir_startino;
|
|
pag->pagl_pagino = pagino;
|
|
|
|
} else {
|
|
/*
|
|
* We've reached the end of the btree. because
|
|
* we are only searching a small chunk of the
|
|
* btree each search, there is obviously free
|
|
* inodes closer to the parent inode than we
|
|
* are now. restart the search again.
|
|
*/
|
|
pag->pagl_pagino = NULLAGINO;
|
|
pag->pagl_leftrec = NULLAGINO;
|
|
pag->pagl_rightrec = NULLAGINO;
|
|
xfs_btree_del_cursor(tcur, XFS_BTREE_NOERROR);
|
|
xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
|
|
goto restart_pagno;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* In a different AG from the parent.
|
|
* See if the most recently allocated block has any free.
|
|
*/
|
|
if (agi->agi_newino != cpu_to_be32(NULLAGINO)) {
|
|
error = xfs_inobt_lookup(cur, be32_to_cpu(agi->agi_newino),
|
|
XFS_LOOKUP_EQ, &i);
|
|
if (error)
|
|
goto error0;
|
|
|
|
if (i == 1) {
|
|
error = xfs_inobt_get_rec(cur, &rec, &j);
|
|
if (error)
|
|
goto error0;
|
|
|
|
if (j == 1 && rec.ir_freecount > 0) {
|
|
/*
|
|
* The last chunk allocated in the group
|
|
* still has a free inode.
|
|
*/
|
|
goto alloc_inode;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* None left in the last group, search the whole AG
|
|
*/
|
|
error = xfs_inobt_lookup(cur, 0, XFS_LOOKUP_GE, &i);
|
|
if (error)
|
|
goto error0;
|
|
if (XFS_IS_CORRUPT(mp, i != 1)) {
|
|
error = -EFSCORRUPTED;
|
|
goto error0;
|
|
}
|
|
|
|
for (;;) {
|
|
error = xfs_inobt_get_rec(cur, &rec, &i);
|
|
if (error)
|
|
goto error0;
|
|
if (XFS_IS_CORRUPT(mp, i != 1)) {
|
|
error = -EFSCORRUPTED;
|
|
goto error0;
|
|
}
|
|
if (rec.ir_freecount > 0)
|
|
break;
|
|
error = xfs_btree_increment(cur, 0, &i);
|
|
if (error)
|
|
goto error0;
|
|
if (XFS_IS_CORRUPT(mp, i != 1)) {
|
|
error = -EFSCORRUPTED;
|
|
goto error0;
|
|
}
|
|
}
|
|
|
|
alloc_inode:
|
|
offset = xfs_inobt_first_free_inode(&rec);
|
|
ASSERT(offset >= 0);
|
|
ASSERT(offset < XFS_INODES_PER_CHUNK);
|
|
ASSERT((XFS_AGINO_TO_OFFSET(mp, rec.ir_startino) %
|
|
XFS_INODES_PER_CHUNK) == 0);
|
|
ino = XFS_AGINO_TO_INO(mp, agno, rec.ir_startino + offset);
|
|
rec.ir_free &= ~XFS_INOBT_MASK(offset);
|
|
rec.ir_freecount--;
|
|
error = xfs_inobt_update(cur, &rec);
|
|
if (error)
|
|
goto error0;
|
|
be32_add_cpu(&agi->agi_freecount, -1);
|
|
xfs_ialloc_log_agi(tp, agbp, XFS_AGI_FREECOUNT);
|
|
pag->pagi_freecount--;
|
|
|
|
error = xfs_check_agi_freecount(cur, agi);
|
|
if (error)
|
|
goto error0;
|
|
|
|
xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
|
|
xfs_trans_mod_sb(tp, XFS_TRANS_SB_IFREE, -1);
|
|
*inop = ino;
|
|
return 0;
|
|
error1:
|
|
xfs_btree_del_cursor(tcur, XFS_BTREE_ERROR);
|
|
error0:
|
|
xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Use the free inode btree to allocate an inode based on distance from the
|
|
* parent. Note that the provided cursor may be deleted and replaced.
|
|
*/
|
|
STATIC int
|
|
xfs_dialloc_ag_finobt_near(
|
|
xfs_agino_t pagino,
|
|
struct xfs_btree_cur **ocur,
|
|
struct xfs_inobt_rec_incore *rec)
|
|
{
|
|
struct xfs_btree_cur *lcur = *ocur; /* left search cursor */
|
|
struct xfs_btree_cur *rcur; /* right search cursor */
|
|
struct xfs_inobt_rec_incore rrec;
|
|
int error;
|
|
int i, j;
|
|
|
|
error = xfs_inobt_lookup(lcur, pagino, XFS_LOOKUP_LE, &i);
|
|
if (error)
|
|
return error;
|
|
|
|
if (i == 1) {
|
|
error = xfs_inobt_get_rec(lcur, rec, &i);
|
|
if (error)
|
|
return error;
|
|
if (XFS_IS_CORRUPT(lcur->bc_mp, i != 1))
|
|
return -EFSCORRUPTED;
|
|
|
|
/*
|
|
* See if we've landed in the parent inode record. The finobt
|
|
* only tracks chunks with at least one free inode, so record
|
|
* existence is enough.
|
|
*/
|
|
if (pagino >= rec->ir_startino &&
|
|
pagino < (rec->ir_startino + XFS_INODES_PER_CHUNK))
|
|
return 0;
|
|
}
|
|
|
|
error = xfs_btree_dup_cursor(lcur, &rcur);
|
|
if (error)
|
|
return error;
|
|
|
|
error = xfs_inobt_lookup(rcur, pagino, XFS_LOOKUP_GE, &j);
|
|
if (error)
|
|
goto error_rcur;
|
|
if (j == 1) {
|
|
error = xfs_inobt_get_rec(rcur, &rrec, &j);
|
|
if (error)
|
|
goto error_rcur;
|
|
if (XFS_IS_CORRUPT(lcur->bc_mp, j != 1)) {
|
|
error = -EFSCORRUPTED;
|
|
goto error_rcur;
|
|
}
|
|
}
|
|
|
|
if (XFS_IS_CORRUPT(lcur->bc_mp, i != 1 && j != 1)) {
|
|
error = -EFSCORRUPTED;
|
|
goto error_rcur;
|
|
}
|
|
if (i == 1 && j == 1) {
|
|
/*
|
|
* Both the left and right records are valid. Choose the closer
|
|
* inode chunk to the target.
|
|
*/
|
|
if ((pagino - rec->ir_startino + XFS_INODES_PER_CHUNK - 1) >
|
|
(rrec.ir_startino - pagino)) {
|
|
*rec = rrec;
|
|
xfs_btree_del_cursor(lcur, XFS_BTREE_NOERROR);
|
|
*ocur = rcur;
|
|
} else {
|
|
xfs_btree_del_cursor(rcur, XFS_BTREE_NOERROR);
|
|
}
|
|
} else if (j == 1) {
|
|
/* only the right record is valid */
|
|
*rec = rrec;
|
|
xfs_btree_del_cursor(lcur, XFS_BTREE_NOERROR);
|
|
*ocur = rcur;
|
|
} else if (i == 1) {
|
|
/* only the left record is valid */
|
|
xfs_btree_del_cursor(rcur, XFS_BTREE_NOERROR);
|
|
}
|
|
|
|
return 0;
|
|
|
|
error_rcur:
|
|
xfs_btree_del_cursor(rcur, XFS_BTREE_ERROR);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Use the free inode btree to find a free inode based on a newino hint. If
|
|
* the hint is NULL, find the first free inode in the AG.
|
|
*/
|
|
STATIC int
|
|
xfs_dialloc_ag_finobt_newino(
|
|
struct xfs_agi *agi,
|
|
struct xfs_btree_cur *cur,
|
|
struct xfs_inobt_rec_incore *rec)
|
|
{
|
|
int error;
|
|
int i;
|
|
|
|
if (agi->agi_newino != cpu_to_be32(NULLAGINO)) {
|
|
error = xfs_inobt_lookup(cur, be32_to_cpu(agi->agi_newino),
|
|
XFS_LOOKUP_EQ, &i);
|
|
if (error)
|
|
return error;
|
|
if (i == 1) {
|
|
error = xfs_inobt_get_rec(cur, rec, &i);
|
|
if (error)
|
|
return error;
|
|
if (XFS_IS_CORRUPT(cur->bc_mp, i != 1))
|
|
return -EFSCORRUPTED;
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Find the first inode available in the AG.
|
|
*/
|
|
error = xfs_inobt_lookup(cur, 0, XFS_LOOKUP_GE, &i);
|
|
if (error)
|
|
return error;
|
|
if (XFS_IS_CORRUPT(cur->bc_mp, i != 1))
|
|
return -EFSCORRUPTED;
|
|
|
|
error = xfs_inobt_get_rec(cur, rec, &i);
|
|
if (error)
|
|
return error;
|
|
if (XFS_IS_CORRUPT(cur->bc_mp, i != 1))
|
|
return -EFSCORRUPTED;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Update the inobt based on a modification made to the finobt. Also ensure that
|
|
* the records from both trees are equivalent post-modification.
|
|
*/
|
|
STATIC int
|
|
xfs_dialloc_ag_update_inobt(
|
|
struct xfs_btree_cur *cur, /* inobt cursor */
|
|
struct xfs_inobt_rec_incore *frec, /* finobt record */
|
|
int offset) /* inode offset */
|
|
{
|
|
struct xfs_inobt_rec_incore rec;
|
|
int error;
|
|
int i;
|
|
|
|
error = xfs_inobt_lookup(cur, frec->ir_startino, XFS_LOOKUP_EQ, &i);
|
|
if (error)
|
|
return error;
|
|
if (XFS_IS_CORRUPT(cur->bc_mp, i != 1))
|
|
return -EFSCORRUPTED;
|
|
|
|
error = xfs_inobt_get_rec(cur, &rec, &i);
|
|
if (error)
|
|
return error;
|
|
if (XFS_IS_CORRUPT(cur->bc_mp, i != 1))
|
|
return -EFSCORRUPTED;
|
|
ASSERT((XFS_AGINO_TO_OFFSET(cur->bc_mp, rec.ir_startino) %
|
|
XFS_INODES_PER_CHUNK) == 0);
|
|
|
|
rec.ir_free &= ~XFS_INOBT_MASK(offset);
|
|
rec.ir_freecount--;
|
|
|
|
if (XFS_IS_CORRUPT(cur->bc_mp,
|
|
rec.ir_free != frec->ir_free ||
|
|
rec.ir_freecount != frec->ir_freecount))
|
|
return -EFSCORRUPTED;
|
|
|
|
return xfs_inobt_update(cur, &rec);
|
|
}
|
|
|
|
/*
|
|
* Allocate an inode using the free inode btree, if available. Otherwise, fall
|
|
* back to the inobt search algorithm.
|
|
*
|
|
* The caller selected an AG for us, and made sure that free inodes are
|
|
* available.
|
|
*/
|
|
int
|
|
xfs_dialloc_ag(
|
|
struct xfs_trans *tp,
|
|
struct xfs_buf *agbp,
|
|
xfs_ino_t parent,
|
|
xfs_ino_t *inop)
|
|
{
|
|
struct xfs_mount *mp = tp->t_mountp;
|
|
struct xfs_agi *agi = agbp->b_addr;
|
|
xfs_agnumber_t agno = be32_to_cpu(agi->agi_seqno);
|
|
xfs_agnumber_t pagno = XFS_INO_TO_AGNO(mp, parent);
|
|
xfs_agino_t pagino = XFS_INO_TO_AGINO(mp, parent);
|
|
struct xfs_btree_cur *cur; /* finobt cursor */
|
|
struct xfs_btree_cur *icur; /* inobt cursor */
|
|
struct xfs_inobt_rec_incore rec;
|
|
xfs_ino_t ino;
|
|
int error;
|
|
int offset;
|
|
int i;
|
|
|
|
if (!xfs_sb_version_hasfinobt(&mp->m_sb))
|
|
return xfs_dialloc_ag_inobt(tp, agbp, parent, inop);
|
|
|
|
/*
|
|
* If pagino is 0 (this is the root inode allocation) use newino.
|
|
* This must work because we've just allocated some.
|
|
*/
|
|
if (!pagino)
|
|
pagino = be32_to_cpu(agi->agi_newino);
|
|
|
|
cur = xfs_inobt_init_cursor(mp, tp, agbp, agno, XFS_BTNUM_FINO);
|
|
|
|
error = xfs_check_agi_freecount(cur, agi);
|
|
if (error)
|
|
goto error_cur;
|
|
|
|
/*
|
|
* The search algorithm depends on whether we're in the same AG as the
|
|
* parent. If so, find the closest available inode to the parent. If
|
|
* not, consider the agi hint or find the first free inode in the AG.
|
|
*/
|
|
if (agno == pagno)
|
|
error = xfs_dialloc_ag_finobt_near(pagino, &cur, &rec);
|
|
else
|
|
error = xfs_dialloc_ag_finobt_newino(agi, cur, &rec);
|
|
if (error)
|
|
goto error_cur;
|
|
|
|
offset = xfs_inobt_first_free_inode(&rec);
|
|
ASSERT(offset >= 0);
|
|
ASSERT(offset < XFS_INODES_PER_CHUNK);
|
|
ASSERT((XFS_AGINO_TO_OFFSET(mp, rec.ir_startino) %
|
|
XFS_INODES_PER_CHUNK) == 0);
|
|
ino = XFS_AGINO_TO_INO(mp, agno, rec.ir_startino + offset);
|
|
|
|
/*
|
|
* Modify or remove the finobt record.
|
|
*/
|
|
rec.ir_free &= ~XFS_INOBT_MASK(offset);
|
|
rec.ir_freecount--;
|
|
if (rec.ir_freecount)
|
|
error = xfs_inobt_update(cur, &rec);
|
|
else
|
|
error = xfs_btree_delete(cur, &i);
|
|
if (error)
|
|
goto error_cur;
|
|
|
|
/*
|
|
* The finobt has now been updated appropriately. We haven't updated the
|
|
* agi and superblock yet, so we can create an inobt cursor and validate
|
|
* the original freecount. If all is well, make the equivalent update to
|
|
* the inobt using the finobt record and offset information.
|
|
*/
|
|
icur = xfs_inobt_init_cursor(mp, tp, agbp, agno, XFS_BTNUM_INO);
|
|
|
|
error = xfs_check_agi_freecount(icur, agi);
|
|
if (error)
|
|
goto error_icur;
|
|
|
|
error = xfs_dialloc_ag_update_inobt(icur, &rec, offset);
|
|
if (error)
|
|
goto error_icur;
|
|
|
|
/*
|
|
* Both trees have now been updated. We must update the perag and
|
|
* superblock before we can check the freecount for each btree.
|
|
*/
|
|
be32_add_cpu(&agi->agi_freecount, -1);
|
|
xfs_ialloc_log_agi(tp, agbp, XFS_AGI_FREECOUNT);
|
|
agbp->b_pag->pagi_freecount--;
|
|
|
|
xfs_trans_mod_sb(tp, XFS_TRANS_SB_IFREE, -1);
|
|
|
|
error = xfs_check_agi_freecount(icur, agi);
|
|
if (error)
|
|
goto error_icur;
|
|
error = xfs_check_agi_freecount(cur, agi);
|
|
if (error)
|
|
goto error_icur;
|
|
|
|
xfs_btree_del_cursor(icur, XFS_BTREE_NOERROR);
|
|
xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
|
|
*inop = ino;
|
|
return 0;
|
|
|
|
error_icur:
|
|
xfs_btree_del_cursor(icur, XFS_BTREE_ERROR);
|
|
error_cur:
|
|
xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
|
|
return error;
|
|
}
|
|
|
|
static int
|
|
xfs_dialloc_roll(
|
|
struct xfs_trans **tpp,
|
|
struct xfs_buf *agibp)
|
|
{
|
|
struct xfs_trans *tp = *tpp;
|
|
struct xfs_dquot_acct *dqinfo;
|
|
int error;
|
|
|
|
/*
|
|
* Hold to on to the agibp across the commit so no other allocation can
|
|
* come in and take the free inodes we just allocated for our caller.
|
|
*/
|
|
xfs_trans_bhold(tp, agibp);
|
|
|
|
/*
|
|
* We want the quota changes to be associated with the next transaction,
|
|
* NOT this one. So, detach the dqinfo from this and attach it to the
|
|
* next transaction.
|
|
*/
|
|
dqinfo = tp->t_dqinfo;
|
|
tp->t_dqinfo = NULL;
|
|
|
|
error = xfs_trans_roll(&tp);
|
|
|
|
/* Re-attach the quota info that we detached from prev trx. */
|
|
tp->t_dqinfo = dqinfo;
|
|
|
|
*tpp = tp;
|
|
if (error)
|
|
return error;
|
|
xfs_trans_bjoin(tp, agibp);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Select and prepare an AG for inode allocation.
|
|
*
|
|
* Mode is used to tell whether the new inode is a directory and hence where to
|
|
* locate it.
|
|
*
|
|
* This function will ensure that the selected AG has free inodes available to
|
|
* allocate from. The selected AGI will be returned locked to the caller, and it
|
|
* will allocate more free inodes if required. If no free inodes are found or
|
|
* can be allocated, no AGI will be returned.
|
|
*/
|
|
int
|
|
xfs_dialloc_select_ag(
|
|
struct xfs_trans **tpp,
|
|
xfs_ino_t parent,
|
|
umode_t mode,
|
|
struct xfs_buf **IO_agbp)
|
|
{
|
|
struct xfs_mount *mp = (*tpp)->t_mountp;
|
|
struct xfs_buf *agbp;
|
|
xfs_agnumber_t agno;
|
|
int error;
|
|
bool noroom = false;
|
|
xfs_agnumber_t start_agno;
|
|
struct xfs_perag *pag;
|
|
struct xfs_ino_geometry *igeo = M_IGEO(mp);
|
|
bool okalloc = true;
|
|
|
|
*IO_agbp = NULL;
|
|
|
|
/*
|
|
* We do not have an agbp, so select an initial allocation
|
|
* group for inode allocation.
|
|
*/
|
|
start_agno = xfs_ialloc_ag_select(*tpp, parent, mode);
|
|
if (start_agno == NULLAGNUMBER)
|
|
return 0;
|
|
|
|
/*
|
|
* If we have already hit the ceiling of inode blocks then clear
|
|
* okalloc so we scan all available agi structures for a free
|
|
* inode.
|
|
*
|
|
* Read rough value of mp->m_icount by percpu_counter_read_positive,
|
|
* which will sacrifice the preciseness but improve the performance.
|
|
*/
|
|
if (igeo->maxicount &&
|
|
percpu_counter_read_positive(&mp->m_icount) + igeo->ialloc_inos
|
|
> igeo->maxicount) {
|
|
noroom = true;
|
|
okalloc = false;
|
|
}
|
|
|
|
/*
|
|
* Loop until we find an allocation group that either has free inodes
|
|
* or in which we can allocate some inodes. Iterate through the
|
|
* allocation groups upward, wrapping at the end.
|
|
*/
|
|
agno = start_agno;
|
|
for (;;) {
|
|
pag = xfs_perag_get(mp, agno);
|
|
if (!pag->pagi_inodeok) {
|
|
xfs_ialloc_next_ag(mp);
|
|
goto nextag;
|
|
}
|
|
|
|
if (!pag->pagi_init) {
|
|
error = xfs_ialloc_pagi_init(mp, *tpp, agno);
|
|
if (error)
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* Do a first racy fast path check if this AG is usable.
|
|
*/
|
|
if (!pag->pagi_freecount && !okalloc)
|
|
goto nextag;
|
|
|
|
/*
|
|
* Then read in the AGI buffer and recheck with the AGI buffer
|
|
* lock held.
|
|
*/
|
|
error = xfs_ialloc_read_agi(mp, *tpp, agno, &agbp);
|
|
if (error)
|
|
break;
|
|
|
|
if (pag->pagi_freecount) {
|
|
xfs_perag_put(pag);
|
|
goto found_ag;
|
|
}
|
|
|
|
if (!okalloc)
|
|
goto nextag_relse_buffer;
|
|
|
|
error = xfs_ialloc_ag_alloc(*tpp, agbp);
|
|
if (error < 0) {
|
|
xfs_trans_brelse(*tpp, agbp);
|
|
|
|
if (error == -ENOSPC)
|
|
error = 0;
|
|
break;
|
|
}
|
|
|
|
if (error == 0) {
|
|
/*
|
|
* We successfully allocated space for an inode cluster
|
|
* in this AG. Roll the transaction so that we can
|
|
* allocate one of the new inodes.
|
|
*/
|
|
ASSERT(pag->pagi_freecount > 0);
|
|
xfs_perag_put(pag);
|
|
|
|
error = xfs_dialloc_roll(tpp, agbp);
|
|
if (error) {
|
|
xfs_buf_relse(agbp);
|
|
return error;
|
|
}
|
|
goto found_ag;
|
|
}
|
|
|
|
nextag_relse_buffer:
|
|
xfs_trans_brelse(*tpp, agbp);
|
|
nextag:
|
|
xfs_perag_put(pag);
|
|
if (++agno == mp->m_sb.sb_agcount)
|
|
agno = 0;
|
|
if (agno == start_agno)
|
|
return noroom ? -ENOSPC : 0;
|
|
}
|
|
|
|
xfs_perag_put(pag);
|
|
return error;
|
|
found_ag:
|
|
*IO_agbp = agbp;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Free the blocks of an inode chunk. We must consider that the inode chunk
|
|
* might be sparse and only free the regions that are allocated as part of the
|
|
* chunk.
|
|
*/
|
|
STATIC void
|
|
xfs_difree_inode_chunk(
|
|
struct xfs_trans *tp,
|
|
xfs_agnumber_t agno,
|
|
struct xfs_inobt_rec_incore *rec)
|
|
{
|
|
struct xfs_mount *mp = tp->t_mountp;
|
|
xfs_agblock_t sagbno = XFS_AGINO_TO_AGBNO(mp,
|
|
rec->ir_startino);
|
|
int startidx, endidx;
|
|
int nextbit;
|
|
xfs_agblock_t agbno;
|
|
int contigblk;
|
|
DECLARE_BITMAP(holemask, XFS_INOBT_HOLEMASK_BITS);
|
|
|
|
if (!xfs_inobt_issparse(rec->ir_holemask)) {
|
|
/* not sparse, calculate extent info directly */
|
|
xfs_bmap_add_free(tp, XFS_AGB_TO_FSB(mp, agno, sagbno),
|
|
M_IGEO(mp)->ialloc_blks,
|
|
&XFS_RMAP_OINFO_INODES);
|
|
return;
|
|
}
|
|
|
|
/* holemask is only 16-bits (fits in an unsigned long) */
|
|
ASSERT(sizeof(rec->ir_holemask) <= sizeof(holemask[0]));
|
|
holemask[0] = rec->ir_holemask;
|
|
|
|
/*
|
|
* Find contiguous ranges of zeroes (i.e., allocated regions) in the
|
|
* holemask and convert the start/end index of each range to an extent.
|
|
* We start with the start and end index both pointing at the first 0 in
|
|
* the mask.
|
|
*/
|
|
startidx = endidx = find_first_zero_bit(holemask,
|
|
XFS_INOBT_HOLEMASK_BITS);
|
|
nextbit = startidx + 1;
|
|
while (startidx < XFS_INOBT_HOLEMASK_BITS) {
|
|
nextbit = find_next_zero_bit(holemask, XFS_INOBT_HOLEMASK_BITS,
|
|
nextbit);
|
|
/*
|
|
* If the next zero bit is contiguous, update the end index of
|
|
* the current range and continue.
|
|
*/
|
|
if (nextbit != XFS_INOBT_HOLEMASK_BITS &&
|
|
nextbit == endidx + 1) {
|
|
endidx = nextbit;
|
|
goto next;
|
|
}
|
|
|
|
/*
|
|
* nextbit is not contiguous with the current end index. Convert
|
|
* the current start/end to an extent and add it to the free
|
|
* list.
|
|
*/
|
|
agbno = sagbno + (startidx * XFS_INODES_PER_HOLEMASK_BIT) /
|
|
mp->m_sb.sb_inopblock;
|
|
contigblk = ((endidx - startidx + 1) *
|
|
XFS_INODES_PER_HOLEMASK_BIT) /
|
|
mp->m_sb.sb_inopblock;
|
|
|
|
ASSERT(agbno % mp->m_sb.sb_spino_align == 0);
|
|
ASSERT(contigblk % mp->m_sb.sb_spino_align == 0);
|
|
xfs_bmap_add_free(tp, XFS_AGB_TO_FSB(mp, agno, agbno),
|
|
contigblk, &XFS_RMAP_OINFO_INODES);
|
|
|
|
/* reset range to current bit and carry on... */
|
|
startidx = endidx = nextbit;
|
|
|
|
next:
|
|
nextbit++;
|
|
}
|
|
}
|
|
|
|
STATIC int
|
|
xfs_difree_inobt(
|
|
struct xfs_mount *mp,
|
|
struct xfs_trans *tp,
|
|
struct xfs_buf *agbp,
|
|
xfs_agino_t agino,
|
|
struct xfs_icluster *xic,
|
|
struct xfs_inobt_rec_incore *orec)
|
|
{
|
|
struct xfs_agi *agi = agbp->b_addr;
|
|
xfs_agnumber_t agno = be32_to_cpu(agi->agi_seqno);
|
|
struct xfs_btree_cur *cur;
|
|
struct xfs_inobt_rec_incore rec;
|
|
int ilen;
|
|
int error;
|
|
int i;
|
|
int off;
|
|
|
|
ASSERT(agi->agi_magicnum == cpu_to_be32(XFS_AGI_MAGIC));
|
|
ASSERT(XFS_AGINO_TO_AGBNO(mp, agino) < be32_to_cpu(agi->agi_length));
|
|
|
|
/*
|
|
* Initialize the cursor.
|
|
*/
|
|
cur = xfs_inobt_init_cursor(mp, tp, agbp, agno, XFS_BTNUM_INO);
|
|
|
|
error = xfs_check_agi_freecount(cur, agi);
|
|
if (error)
|
|
goto error0;
|
|
|
|
/*
|
|
* Look for the entry describing this inode.
|
|
*/
|
|
if ((error = xfs_inobt_lookup(cur, agino, XFS_LOOKUP_LE, &i))) {
|
|
xfs_warn(mp, "%s: xfs_inobt_lookup() returned error %d.",
|
|
__func__, error);
|
|
goto error0;
|
|
}
|
|
if (XFS_IS_CORRUPT(mp, i != 1)) {
|
|
error = -EFSCORRUPTED;
|
|
goto error0;
|
|
}
|
|
error = xfs_inobt_get_rec(cur, &rec, &i);
|
|
if (error) {
|
|
xfs_warn(mp, "%s: xfs_inobt_get_rec() returned error %d.",
|
|
__func__, error);
|
|
goto error0;
|
|
}
|
|
if (XFS_IS_CORRUPT(mp, i != 1)) {
|
|
error = -EFSCORRUPTED;
|
|
goto error0;
|
|
}
|
|
/*
|
|
* Get the offset in the inode chunk.
|
|
*/
|
|
off = agino - rec.ir_startino;
|
|
ASSERT(off >= 0 && off < XFS_INODES_PER_CHUNK);
|
|
ASSERT(!(rec.ir_free & XFS_INOBT_MASK(off)));
|
|
/*
|
|
* Mark the inode free & increment the count.
|
|
*/
|
|
rec.ir_free |= XFS_INOBT_MASK(off);
|
|
rec.ir_freecount++;
|
|
|
|
/*
|
|
* When an inode chunk is free, it becomes eligible for removal. Don't
|
|
* remove the chunk if the block size is large enough for multiple inode
|
|
* chunks (that might not be free).
|
|
*/
|
|
if (!(mp->m_flags & XFS_MOUNT_IKEEP) &&
|
|
rec.ir_free == XFS_INOBT_ALL_FREE &&
|
|
mp->m_sb.sb_inopblock <= XFS_INODES_PER_CHUNK) {
|
|
struct xfs_perag *pag = agbp->b_pag;
|
|
|
|
xic->deleted = true;
|
|
xic->first_ino = XFS_AGINO_TO_INO(mp, agno, rec.ir_startino);
|
|
xic->alloc = xfs_inobt_irec_to_allocmask(&rec);
|
|
|
|
/*
|
|
* Remove the inode cluster from the AGI B+Tree, adjust the
|
|
* AGI and Superblock inode counts, and mark the disk space
|
|
* to be freed when the transaction is committed.
|
|
*/
|
|
ilen = rec.ir_freecount;
|
|
be32_add_cpu(&agi->agi_count, -ilen);
|
|
be32_add_cpu(&agi->agi_freecount, -(ilen - 1));
|
|
xfs_ialloc_log_agi(tp, agbp, XFS_AGI_COUNT | XFS_AGI_FREECOUNT);
|
|
pag->pagi_freecount -= ilen - 1;
|
|
pag->pagi_count -= ilen;
|
|
xfs_trans_mod_sb(tp, XFS_TRANS_SB_ICOUNT, -ilen);
|
|
xfs_trans_mod_sb(tp, XFS_TRANS_SB_IFREE, -(ilen - 1));
|
|
|
|
if ((error = xfs_btree_delete(cur, &i))) {
|
|
xfs_warn(mp, "%s: xfs_btree_delete returned error %d.",
|
|
__func__, error);
|
|
goto error0;
|
|
}
|
|
|
|
xfs_difree_inode_chunk(tp, agno, &rec);
|
|
} else {
|
|
xic->deleted = false;
|
|
|
|
error = xfs_inobt_update(cur, &rec);
|
|
if (error) {
|
|
xfs_warn(mp, "%s: xfs_inobt_update returned error %d.",
|
|
__func__, error);
|
|
goto error0;
|
|
}
|
|
|
|
/*
|
|
* Change the inode free counts and log the ag/sb changes.
|
|
*/
|
|
be32_add_cpu(&agi->agi_freecount, 1);
|
|
xfs_ialloc_log_agi(tp, agbp, XFS_AGI_FREECOUNT);
|
|
agbp->b_pag->pagi_freecount++;
|
|
xfs_trans_mod_sb(tp, XFS_TRANS_SB_IFREE, 1);
|
|
}
|
|
|
|
error = xfs_check_agi_freecount(cur, agi);
|
|
if (error)
|
|
goto error0;
|
|
|
|
*orec = rec;
|
|
xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
|
|
return 0;
|
|
|
|
error0:
|
|
xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Free an inode in the free inode btree.
|
|
*/
|
|
STATIC int
|
|
xfs_difree_finobt(
|
|
struct xfs_mount *mp,
|
|
struct xfs_trans *tp,
|
|
struct xfs_buf *agbp,
|
|
xfs_agino_t agino,
|
|
struct xfs_inobt_rec_incore *ibtrec) /* inobt record */
|
|
{
|
|
struct xfs_agi *agi = agbp->b_addr;
|
|
xfs_agnumber_t agno = be32_to_cpu(agi->agi_seqno);
|
|
struct xfs_btree_cur *cur;
|
|
struct xfs_inobt_rec_incore rec;
|
|
int offset = agino - ibtrec->ir_startino;
|
|
int error;
|
|
int i;
|
|
|
|
cur = xfs_inobt_init_cursor(mp, tp, agbp, agno, XFS_BTNUM_FINO);
|
|
|
|
error = xfs_inobt_lookup(cur, ibtrec->ir_startino, XFS_LOOKUP_EQ, &i);
|
|
if (error)
|
|
goto error;
|
|
if (i == 0) {
|
|
/*
|
|
* If the record does not exist in the finobt, we must have just
|
|
* freed an inode in a previously fully allocated chunk. If not,
|
|
* something is out of sync.
|
|
*/
|
|
if (XFS_IS_CORRUPT(mp, ibtrec->ir_freecount != 1)) {
|
|
error = -EFSCORRUPTED;
|
|
goto error;
|
|
}
|
|
|
|
error = xfs_inobt_insert_rec(cur, ibtrec->ir_holemask,
|
|
ibtrec->ir_count,
|
|
ibtrec->ir_freecount,
|
|
ibtrec->ir_free, &i);
|
|
if (error)
|
|
goto error;
|
|
ASSERT(i == 1);
|
|
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Read and update the existing record. We could just copy the ibtrec
|
|
* across here, but that would defeat the purpose of having redundant
|
|
* metadata. By making the modifications independently, we can catch
|
|
* corruptions that we wouldn't see if we just copied from one record
|
|
* to another.
|
|
*/
|
|
error = xfs_inobt_get_rec(cur, &rec, &i);
|
|
if (error)
|
|
goto error;
|
|
if (XFS_IS_CORRUPT(mp, i != 1)) {
|
|
error = -EFSCORRUPTED;
|
|
goto error;
|
|
}
|
|
|
|
rec.ir_free |= XFS_INOBT_MASK(offset);
|
|
rec.ir_freecount++;
|
|
|
|
if (XFS_IS_CORRUPT(mp,
|
|
rec.ir_free != ibtrec->ir_free ||
|
|
rec.ir_freecount != ibtrec->ir_freecount)) {
|
|
error = -EFSCORRUPTED;
|
|
goto error;
|
|
}
|
|
|
|
/*
|
|
* The content of inobt records should always match between the inobt
|
|
* and finobt. The lifecycle of records in the finobt is different from
|
|
* the inobt in that the finobt only tracks records with at least one
|
|
* free inode. Hence, if all of the inodes are free and we aren't
|
|
* keeping inode chunks permanently on disk, remove the record.
|
|
* Otherwise, update the record with the new information.
|
|
*
|
|
* Note that we currently can't free chunks when the block size is large
|
|
* enough for multiple chunks. Leave the finobt record to remain in sync
|
|
* with the inobt.
|
|
*/
|
|
if (rec.ir_free == XFS_INOBT_ALL_FREE &&
|
|
mp->m_sb.sb_inopblock <= XFS_INODES_PER_CHUNK &&
|
|
!(mp->m_flags & XFS_MOUNT_IKEEP)) {
|
|
error = xfs_btree_delete(cur, &i);
|
|
if (error)
|
|
goto error;
|
|
ASSERT(i == 1);
|
|
} else {
|
|
error = xfs_inobt_update(cur, &rec);
|
|
if (error)
|
|
goto error;
|
|
}
|
|
|
|
out:
|
|
error = xfs_check_agi_freecount(cur, agi);
|
|
if (error)
|
|
goto error;
|
|
|
|
xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
|
|
return 0;
|
|
|
|
error:
|
|
xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Free disk inode. Carefully avoids touching the incore inode, all
|
|
* manipulations incore are the caller's responsibility.
|
|
* The on-disk inode is not changed by this operation, only the
|
|
* btree (free inode mask) is changed.
|
|
*/
|
|
int
|
|
xfs_difree(
|
|
struct xfs_trans *tp, /* transaction pointer */
|
|
xfs_ino_t inode, /* inode to be freed */
|
|
struct xfs_icluster *xic) /* cluster info if deleted */
|
|
{
|
|
/* REFERENCED */
|
|
xfs_agblock_t agbno; /* block number containing inode */
|
|
struct xfs_buf *agbp; /* buffer for allocation group header */
|
|
xfs_agino_t agino; /* allocation group inode number */
|
|
xfs_agnumber_t agno; /* allocation group number */
|
|
int error; /* error return value */
|
|
struct xfs_mount *mp; /* mount structure for filesystem */
|
|
struct xfs_inobt_rec_incore rec;/* btree record */
|
|
|
|
mp = tp->t_mountp;
|
|
|
|
/*
|
|
* Break up inode number into its components.
|
|
*/
|
|
agno = XFS_INO_TO_AGNO(mp, inode);
|
|
if (agno >= mp->m_sb.sb_agcount) {
|
|
xfs_warn(mp, "%s: agno >= mp->m_sb.sb_agcount (%d >= %d).",
|
|
__func__, agno, mp->m_sb.sb_agcount);
|
|
ASSERT(0);
|
|
return -EINVAL;
|
|
}
|
|
agino = XFS_INO_TO_AGINO(mp, inode);
|
|
if (inode != XFS_AGINO_TO_INO(mp, agno, agino)) {
|
|
xfs_warn(mp, "%s: inode != XFS_AGINO_TO_INO() (%llu != %llu).",
|
|
__func__, (unsigned long long)inode,
|
|
(unsigned long long)XFS_AGINO_TO_INO(mp, agno, agino));
|
|
ASSERT(0);
|
|
return -EINVAL;
|
|
}
|
|
agbno = XFS_AGINO_TO_AGBNO(mp, agino);
|
|
if (agbno >= mp->m_sb.sb_agblocks) {
|
|
xfs_warn(mp, "%s: agbno >= mp->m_sb.sb_agblocks (%d >= %d).",
|
|
__func__, agbno, mp->m_sb.sb_agblocks);
|
|
ASSERT(0);
|
|
return -EINVAL;
|
|
}
|
|
/*
|
|
* Get the allocation group header.
|
|
*/
|
|
error = xfs_ialloc_read_agi(mp, tp, agno, &agbp);
|
|
if (error) {
|
|
xfs_warn(mp, "%s: xfs_ialloc_read_agi() returned error %d.",
|
|
__func__, error);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Fix up the inode allocation btree.
|
|
*/
|
|
error = xfs_difree_inobt(mp, tp, agbp, agino, xic, &rec);
|
|
if (error)
|
|
goto error0;
|
|
|
|
/*
|
|
* Fix up the free inode btree.
|
|
*/
|
|
if (xfs_sb_version_hasfinobt(&mp->m_sb)) {
|
|
error = xfs_difree_finobt(mp, tp, agbp, agino, &rec);
|
|
if (error)
|
|
goto error0;
|
|
}
|
|
|
|
return 0;
|
|
|
|
error0:
|
|
return error;
|
|
}
|
|
|
|
STATIC int
|
|
xfs_imap_lookup(
|
|
struct xfs_mount *mp,
|
|
struct xfs_trans *tp,
|
|
xfs_agnumber_t agno,
|
|
xfs_agino_t agino,
|
|
xfs_agblock_t agbno,
|
|
xfs_agblock_t *chunk_agbno,
|
|
xfs_agblock_t *offset_agbno,
|
|
int flags)
|
|
{
|
|
struct xfs_inobt_rec_incore rec;
|
|
struct xfs_btree_cur *cur;
|
|
struct xfs_buf *agbp;
|
|
int error;
|
|
int i;
|
|
|
|
error = xfs_ialloc_read_agi(mp, tp, agno, &agbp);
|
|
if (error) {
|
|
xfs_alert(mp,
|
|
"%s: xfs_ialloc_read_agi() returned error %d, agno %d",
|
|
__func__, error, agno);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Lookup the inode record for the given agino. If the record cannot be
|
|
* found, then it's an invalid inode number and we should abort. Once
|
|
* we have a record, we need to ensure it contains the inode number
|
|
* we are looking up.
|
|
*/
|
|
cur = xfs_inobt_init_cursor(mp, tp, agbp, agno, XFS_BTNUM_INO);
|
|
error = xfs_inobt_lookup(cur, agino, XFS_LOOKUP_LE, &i);
|
|
if (!error) {
|
|
if (i)
|
|
error = xfs_inobt_get_rec(cur, &rec, &i);
|
|
if (!error && i == 0)
|
|
error = -EINVAL;
|
|
}
|
|
|
|
xfs_trans_brelse(tp, agbp);
|
|
xfs_btree_del_cursor(cur, error);
|
|
if (error)
|
|
return error;
|
|
|
|
/* check that the returned record contains the required inode */
|
|
if (rec.ir_startino > agino ||
|
|
rec.ir_startino + M_IGEO(mp)->ialloc_inos <= agino)
|
|
return -EINVAL;
|
|
|
|
/* for untrusted inodes check it is allocated first */
|
|
if ((flags & XFS_IGET_UNTRUSTED) &&
|
|
(rec.ir_free & XFS_INOBT_MASK(agino - rec.ir_startino)))
|
|
return -EINVAL;
|
|
|
|
*chunk_agbno = XFS_AGINO_TO_AGBNO(mp, rec.ir_startino);
|
|
*offset_agbno = agbno - *chunk_agbno;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Return the location of the inode in imap, for mapping it into a buffer.
|
|
*/
|
|
int
|
|
xfs_imap(
|
|
xfs_mount_t *mp, /* file system mount structure */
|
|
xfs_trans_t *tp, /* transaction pointer */
|
|
xfs_ino_t ino, /* inode to locate */
|
|
struct xfs_imap *imap, /* location map structure */
|
|
uint flags) /* flags for inode btree lookup */
|
|
{
|
|
xfs_agblock_t agbno; /* block number of inode in the alloc group */
|
|
xfs_agino_t agino; /* inode number within alloc group */
|
|
xfs_agnumber_t agno; /* allocation group number */
|
|
xfs_agblock_t chunk_agbno; /* first block in inode chunk */
|
|
xfs_agblock_t cluster_agbno; /* first block in inode cluster */
|
|
int error; /* error code */
|
|
int offset; /* index of inode in its buffer */
|
|
xfs_agblock_t offset_agbno; /* blks from chunk start to inode */
|
|
|
|
ASSERT(ino != NULLFSINO);
|
|
|
|
/*
|
|
* Split up the inode number into its parts.
|
|
*/
|
|
agno = XFS_INO_TO_AGNO(mp, ino);
|
|
agino = XFS_INO_TO_AGINO(mp, ino);
|
|
agbno = XFS_AGINO_TO_AGBNO(mp, agino);
|
|
if (agno >= mp->m_sb.sb_agcount || agbno >= mp->m_sb.sb_agblocks ||
|
|
ino != XFS_AGINO_TO_INO(mp, agno, agino)) {
|
|
#ifdef DEBUG
|
|
/*
|
|
* Don't output diagnostic information for untrusted inodes
|
|
* as they can be invalid without implying corruption.
|
|
*/
|
|
if (flags & XFS_IGET_UNTRUSTED)
|
|
return -EINVAL;
|
|
if (agno >= mp->m_sb.sb_agcount) {
|
|
xfs_alert(mp,
|
|
"%s: agno (%d) >= mp->m_sb.sb_agcount (%d)",
|
|
__func__, agno, mp->m_sb.sb_agcount);
|
|
}
|
|
if (agbno >= mp->m_sb.sb_agblocks) {
|
|
xfs_alert(mp,
|
|
"%s: agbno (0x%llx) >= mp->m_sb.sb_agblocks (0x%lx)",
|
|
__func__, (unsigned long long)agbno,
|
|
(unsigned long)mp->m_sb.sb_agblocks);
|
|
}
|
|
if (ino != XFS_AGINO_TO_INO(mp, agno, agino)) {
|
|
xfs_alert(mp,
|
|
"%s: ino (0x%llx) != XFS_AGINO_TO_INO() (0x%llx)",
|
|
__func__, ino,
|
|
XFS_AGINO_TO_INO(mp, agno, agino));
|
|
}
|
|
xfs_stack_trace();
|
|
#endif /* DEBUG */
|
|
return -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* For bulkstat and handle lookups, we have an untrusted inode number
|
|
* that we have to verify is valid. We cannot do this just by reading
|
|
* the inode buffer as it may have been unlinked and removed leaving
|
|
* inodes in stale state on disk. Hence we have to do a btree lookup
|
|
* in all cases where an untrusted inode number is passed.
|
|
*/
|
|
if (flags & XFS_IGET_UNTRUSTED) {
|
|
error = xfs_imap_lookup(mp, tp, agno, agino, agbno,
|
|
&chunk_agbno, &offset_agbno, flags);
|
|
if (error)
|
|
return error;
|
|
goto out_map;
|
|
}
|
|
|
|
/*
|
|
* If the inode cluster size is the same as the blocksize or
|
|
* smaller we get to the buffer by simple arithmetics.
|
|
*/
|
|
if (M_IGEO(mp)->blocks_per_cluster == 1) {
|
|
offset = XFS_INO_TO_OFFSET(mp, ino);
|
|
ASSERT(offset < mp->m_sb.sb_inopblock);
|
|
|
|
imap->im_blkno = XFS_AGB_TO_DADDR(mp, agno, agbno);
|
|
imap->im_len = XFS_FSB_TO_BB(mp, 1);
|
|
imap->im_boffset = (unsigned short)(offset <<
|
|
mp->m_sb.sb_inodelog);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* If the inode chunks are aligned then use simple maths to
|
|
* find the location. Otherwise we have to do a btree
|
|
* lookup to find the location.
|
|
*/
|
|
if (M_IGEO(mp)->inoalign_mask) {
|
|
offset_agbno = agbno & M_IGEO(mp)->inoalign_mask;
|
|
chunk_agbno = agbno - offset_agbno;
|
|
} else {
|
|
error = xfs_imap_lookup(mp, tp, agno, agino, agbno,
|
|
&chunk_agbno, &offset_agbno, flags);
|
|
if (error)
|
|
return error;
|
|
}
|
|
|
|
out_map:
|
|
ASSERT(agbno >= chunk_agbno);
|
|
cluster_agbno = chunk_agbno +
|
|
((offset_agbno / M_IGEO(mp)->blocks_per_cluster) *
|
|
M_IGEO(mp)->blocks_per_cluster);
|
|
offset = ((agbno - cluster_agbno) * mp->m_sb.sb_inopblock) +
|
|
XFS_INO_TO_OFFSET(mp, ino);
|
|
|
|
imap->im_blkno = XFS_AGB_TO_DADDR(mp, agno, cluster_agbno);
|
|
imap->im_len = XFS_FSB_TO_BB(mp, M_IGEO(mp)->blocks_per_cluster);
|
|
imap->im_boffset = (unsigned short)(offset << mp->m_sb.sb_inodelog);
|
|
|
|
/*
|
|
* If the inode number maps to a block outside the bounds
|
|
* of the file system then return NULL rather than calling
|
|
* read_buf and panicing when we get an error from the
|
|
* driver.
|
|
*/
|
|
if ((imap->im_blkno + imap->im_len) >
|
|
XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks)) {
|
|
xfs_alert(mp,
|
|
"%s: (im_blkno (0x%llx) + im_len (0x%llx)) > sb_dblocks (0x%llx)",
|
|
__func__, (unsigned long long) imap->im_blkno,
|
|
(unsigned long long) imap->im_len,
|
|
XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks));
|
|
return -EINVAL;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Log specified fields for the ag hdr (inode section). The growth of the agi
|
|
* structure over time requires that we interpret the buffer as two logical
|
|
* regions delineated by the end of the unlinked list. This is due to the size
|
|
* of the hash table and its location in the middle of the agi.
|
|
*
|
|
* For example, a request to log a field before agi_unlinked and a field after
|
|
* agi_unlinked could cause us to log the entire hash table and use an excessive
|
|
* amount of log space. To avoid this behavior, log the region up through
|
|
* agi_unlinked in one call and the region after agi_unlinked through the end of
|
|
* the structure in another.
|
|
*/
|
|
void
|
|
xfs_ialloc_log_agi(
|
|
xfs_trans_t *tp, /* transaction pointer */
|
|
struct xfs_buf *bp, /* allocation group header buffer */
|
|
int fields) /* bitmask of fields to log */
|
|
{
|
|
int first; /* first byte number */
|
|
int last; /* last byte number */
|
|
static const short offsets[] = { /* field starting offsets */
|
|
/* keep in sync with bit definitions */
|
|
offsetof(xfs_agi_t, agi_magicnum),
|
|
offsetof(xfs_agi_t, agi_versionnum),
|
|
offsetof(xfs_agi_t, agi_seqno),
|
|
offsetof(xfs_agi_t, agi_length),
|
|
offsetof(xfs_agi_t, agi_count),
|
|
offsetof(xfs_agi_t, agi_root),
|
|
offsetof(xfs_agi_t, agi_level),
|
|
offsetof(xfs_agi_t, agi_freecount),
|
|
offsetof(xfs_agi_t, agi_newino),
|
|
offsetof(xfs_agi_t, agi_dirino),
|
|
offsetof(xfs_agi_t, agi_unlinked),
|
|
offsetof(xfs_agi_t, agi_free_root),
|
|
offsetof(xfs_agi_t, agi_free_level),
|
|
offsetof(xfs_agi_t, agi_iblocks),
|
|
sizeof(xfs_agi_t)
|
|
};
|
|
#ifdef DEBUG
|
|
struct xfs_agi *agi = bp->b_addr;
|
|
|
|
ASSERT(agi->agi_magicnum == cpu_to_be32(XFS_AGI_MAGIC));
|
|
#endif
|
|
|
|
/*
|
|
* Compute byte offsets for the first and last fields in the first
|
|
* region and log the agi buffer. This only logs up through
|
|
* agi_unlinked.
|
|
*/
|
|
if (fields & XFS_AGI_ALL_BITS_R1) {
|
|
xfs_btree_offsets(fields, offsets, XFS_AGI_NUM_BITS_R1,
|
|
&first, &last);
|
|
xfs_trans_log_buf(tp, bp, first, last);
|
|
}
|
|
|
|
/*
|
|
* Mask off the bits in the first region and calculate the first and
|
|
* last field offsets for any bits in the second region.
|
|
*/
|
|
fields &= ~XFS_AGI_ALL_BITS_R1;
|
|
if (fields) {
|
|
xfs_btree_offsets(fields, offsets, XFS_AGI_NUM_BITS_R2,
|
|
&first, &last);
|
|
xfs_trans_log_buf(tp, bp, first, last);
|
|
}
|
|
}
|
|
|
|
static xfs_failaddr_t
|
|
xfs_agi_verify(
|
|
struct xfs_buf *bp)
|
|
{
|
|
struct xfs_mount *mp = bp->b_mount;
|
|
struct xfs_agi *agi = bp->b_addr;
|
|
int i;
|
|
|
|
if (xfs_sb_version_hascrc(&mp->m_sb)) {
|
|
if (!uuid_equal(&agi->agi_uuid, &mp->m_sb.sb_meta_uuid))
|
|
return __this_address;
|
|
if (!xfs_log_check_lsn(mp, be64_to_cpu(agi->agi_lsn)))
|
|
return __this_address;
|
|
}
|
|
|
|
/*
|
|
* Validate the magic number of the agi block.
|
|
*/
|
|
if (!xfs_verify_magic(bp, agi->agi_magicnum))
|
|
return __this_address;
|
|
if (!XFS_AGI_GOOD_VERSION(be32_to_cpu(agi->agi_versionnum)))
|
|
return __this_address;
|
|
|
|
if (be32_to_cpu(agi->agi_level) < 1 ||
|
|
be32_to_cpu(agi->agi_level) > M_IGEO(mp)->inobt_maxlevels)
|
|
return __this_address;
|
|
|
|
if (xfs_sb_version_hasfinobt(&mp->m_sb) &&
|
|
(be32_to_cpu(agi->agi_free_level) < 1 ||
|
|
be32_to_cpu(agi->agi_free_level) > M_IGEO(mp)->inobt_maxlevels))
|
|
return __this_address;
|
|
|
|
/*
|
|
* during growfs operations, the perag is not fully initialised,
|
|
* so we can't use it for any useful checking. growfs ensures we can't
|
|
* use it by using uncached buffers that don't have the perag attached
|
|
* so we can detect and avoid this problem.
|
|
*/
|
|
if (bp->b_pag && be32_to_cpu(agi->agi_seqno) != bp->b_pag->pag_agno)
|
|
return __this_address;
|
|
|
|
for (i = 0; i < XFS_AGI_UNLINKED_BUCKETS; i++) {
|
|
if (agi->agi_unlinked[i] == cpu_to_be32(NULLAGINO))
|
|
continue;
|
|
if (!xfs_verify_ino(mp, be32_to_cpu(agi->agi_unlinked[i])))
|
|
return __this_address;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static void
|
|
xfs_agi_read_verify(
|
|
struct xfs_buf *bp)
|
|
{
|
|
struct xfs_mount *mp = bp->b_mount;
|
|
xfs_failaddr_t fa;
|
|
|
|
if (xfs_sb_version_hascrc(&mp->m_sb) &&
|
|
!xfs_buf_verify_cksum(bp, XFS_AGI_CRC_OFF))
|
|
xfs_verifier_error(bp, -EFSBADCRC, __this_address);
|
|
else {
|
|
fa = xfs_agi_verify(bp);
|
|
if (XFS_TEST_ERROR(fa, mp, XFS_ERRTAG_IALLOC_READ_AGI))
|
|
xfs_verifier_error(bp, -EFSCORRUPTED, fa);
|
|
}
|
|
}
|
|
|
|
static void
|
|
xfs_agi_write_verify(
|
|
struct xfs_buf *bp)
|
|
{
|
|
struct xfs_mount *mp = bp->b_mount;
|
|
struct xfs_buf_log_item *bip = bp->b_log_item;
|
|
struct xfs_agi *agi = bp->b_addr;
|
|
xfs_failaddr_t fa;
|
|
|
|
fa = xfs_agi_verify(bp);
|
|
if (fa) {
|
|
xfs_verifier_error(bp, -EFSCORRUPTED, fa);
|
|
return;
|
|
}
|
|
|
|
if (!xfs_sb_version_hascrc(&mp->m_sb))
|
|
return;
|
|
|
|
if (bip)
|
|
agi->agi_lsn = cpu_to_be64(bip->bli_item.li_lsn);
|
|
xfs_buf_update_cksum(bp, XFS_AGI_CRC_OFF);
|
|
}
|
|
|
|
const struct xfs_buf_ops xfs_agi_buf_ops = {
|
|
.name = "xfs_agi",
|
|
.magic = { cpu_to_be32(XFS_AGI_MAGIC), cpu_to_be32(XFS_AGI_MAGIC) },
|
|
.verify_read = xfs_agi_read_verify,
|
|
.verify_write = xfs_agi_write_verify,
|
|
.verify_struct = xfs_agi_verify,
|
|
};
|
|
|
|
/*
|
|
* Read in the allocation group header (inode allocation section)
|
|
*/
|
|
int
|
|
xfs_read_agi(
|
|
struct xfs_mount *mp, /* file system mount structure */
|
|
struct xfs_trans *tp, /* transaction pointer */
|
|
xfs_agnumber_t agno, /* allocation group number */
|
|
struct xfs_buf **bpp) /* allocation group hdr buf */
|
|
{
|
|
int error;
|
|
|
|
trace_xfs_read_agi(mp, agno);
|
|
|
|
ASSERT(agno != NULLAGNUMBER);
|
|
error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp,
|
|
XFS_AG_DADDR(mp, agno, XFS_AGI_DADDR(mp)),
|
|
XFS_FSS_TO_BB(mp, 1), 0, bpp, &xfs_agi_buf_ops);
|
|
if (error)
|
|
return error;
|
|
if (tp)
|
|
xfs_trans_buf_set_type(tp, *bpp, XFS_BLFT_AGI_BUF);
|
|
|
|
xfs_buf_set_ref(*bpp, XFS_AGI_REF);
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
xfs_ialloc_read_agi(
|
|
struct xfs_mount *mp, /* file system mount structure */
|
|
struct xfs_trans *tp, /* transaction pointer */
|
|
xfs_agnumber_t agno, /* allocation group number */
|
|
struct xfs_buf **bpp) /* allocation group hdr buf */
|
|
{
|
|
struct xfs_agi *agi; /* allocation group header */
|
|
struct xfs_perag *pag; /* per allocation group data */
|
|
int error;
|
|
|
|
trace_xfs_ialloc_read_agi(mp, agno);
|
|
|
|
error = xfs_read_agi(mp, tp, agno, bpp);
|
|
if (error)
|
|
return error;
|
|
|
|
agi = (*bpp)->b_addr;
|
|
pag = (*bpp)->b_pag;
|
|
if (!pag->pagi_init) {
|
|
pag->pagi_freecount = be32_to_cpu(agi->agi_freecount);
|
|
pag->pagi_count = be32_to_cpu(agi->agi_count);
|
|
pag->pagi_init = 1;
|
|
}
|
|
|
|
/*
|
|
* It's possible for these to be out of sync if
|
|
* we are in the middle of a forced shutdown.
|
|
*/
|
|
ASSERT(pag->pagi_freecount == be32_to_cpu(agi->agi_freecount) ||
|
|
XFS_FORCED_SHUTDOWN(mp));
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Read in the agi to initialise the per-ag data in the mount structure
|
|
*/
|
|
int
|
|
xfs_ialloc_pagi_init(
|
|
xfs_mount_t *mp, /* file system mount structure */
|
|
xfs_trans_t *tp, /* transaction pointer */
|
|
xfs_agnumber_t agno) /* allocation group number */
|
|
{
|
|
struct xfs_buf *bp = NULL;
|
|
int error;
|
|
|
|
error = xfs_ialloc_read_agi(mp, tp, agno, &bp);
|
|
if (error)
|
|
return error;
|
|
if (bp)
|
|
xfs_trans_brelse(tp, bp);
|
|
return 0;
|
|
}
|
|
|
|
/* Is there an inode record covering a given range of inode numbers? */
|
|
int
|
|
xfs_ialloc_has_inode_record(
|
|
struct xfs_btree_cur *cur,
|
|
xfs_agino_t low,
|
|
xfs_agino_t high,
|
|
bool *exists)
|
|
{
|
|
struct xfs_inobt_rec_incore irec;
|
|
xfs_agino_t agino;
|
|
uint16_t holemask;
|
|
int has_record;
|
|
int i;
|
|
int error;
|
|
|
|
*exists = false;
|
|
error = xfs_inobt_lookup(cur, low, XFS_LOOKUP_LE, &has_record);
|
|
while (error == 0 && has_record) {
|
|
error = xfs_inobt_get_rec(cur, &irec, &has_record);
|
|
if (error || irec.ir_startino > high)
|
|
break;
|
|
|
|
agino = irec.ir_startino;
|
|
holemask = irec.ir_holemask;
|
|
for (i = 0; i < XFS_INOBT_HOLEMASK_BITS; holemask >>= 1,
|
|
i++, agino += XFS_INODES_PER_HOLEMASK_BIT) {
|
|
if (holemask & 1)
|
|
continue;
|
|
if (agino + XFS_INODES_PER_HOLEMASK_BIT > low &&
|
|
agino <= high) {
|
|
*exists = true;
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
error = xfs_btree_increment(cur, 0, &has_record);
|
|
}
|
|
return error;
|
|
}
|
|
|
|
/* Is there an inode record covering a given extent? */
|
|
int
|
|
xfs_ialloc_has_inodes_at_extent(
|
|
struct xfs_btree_cur *cur,
|
|
xfs_agblock_t bno,
|
|
xfs_extlen_t len,
|
|
bool *exists)
|
|
{
|
|
xfs_agino_t low;
|
|
xfs_agino_t high;
|
|
|
|
low = XFS_AGB_TO_AGINO(cur->bc_mp, bno);
|
|
high = XFS_AGB_TO_AGINO(cur->bc_mp, bno + len) - 1;
|
|
|
|
return xfs_ialloc_has_inode_record(cur, low, high, exists);
|
|
}
|
|
|
|
struct xfs_ialloc_count_inodes {
|
|
xfs_agino_t count;
|
|
xfs_agino_t freecount;
|
|
};
|
|
|
|
/* Record inode counts across all inobt records. */
|
|
STATIC int
|
|
xfs_ialloc_count_inodes_rec(
|
|
struct xfs_btree_cur *cur,
|
|
union xfs_btree_rec *rec,
|
|
void *priv)
|
|
{
|
|
struct xfs_inobt_rec_incore irec;
|
|
struct xfs_ialloc_count_inodes *ci = priv;
|
|
|
|
xfs_inobt_btrec_to_irec(cur->bc_mp, rec, &irec);
|
|
ci->count += irec.ir_count;
|
|
ci->freecount += irec.ir_freecount;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Count allocated and free inodes under an inobt. */
|
|
int
|
|
xfs_ialloc_count_inodes(
|
|
struct xfs_btree_cur *cur,
|
|
xfs_agino_t *count,
|
|
xfs_agino_t *freecount)
|
|
{
|
|
struct xfs_ialloc_count_inodes ci = {0};
|
|
int error;
|
|
|
|
ASSERT(cur->bc_btnum == XFS_BTNUM_INO);
|
|
error = xfs_btree_query_all(cur, xfs_ialloc_count_inodes_rec, &ci);
|
|
if (error)
|
|
return error;
|
|
|
|
*count = ci.count;
|
|
*freecount = ci.freecount;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Initialize inode-related geometry information.
|
|
*
|
|
* Compute the inode btree min and max levels and set maxicount.
|
|
*
|
|
* Set the inode cluster size. This may still be overridden by the file
|
|
* system block size if it is larger than the chosen cluster size.
|
|
*
|
|
* For v5 filesystems, scale the cluster size with the inode size to keep a
|
|
* constant ratio of inode per cluster buffer, but only if mkfs has set the
|
|
* inode alignment value appropriately for larger cluster sizes.
|
|
*
|
|
* Then compute the inode cluster alignment information.
|
|
*/
|
|
void
|
|
xfs_ialloc_setup_geometry(
|
|
struct xfs_mount *mp)
|
|
{
|
|
struct xfs_sb *sbp = &mp->m_sb;
|
|
struct xfs_ino_geometry *igeo = M_IGEO(mp);
|
|
uint64_t icount;
|
|
uint inodes;
|
|
|
|
igeo->new_diflags2 = 0;
|
|
if (xfs_sb_version_hasbigtime(&mp->m_sb))
|
|
igeo->new_diflags2 |= XFS_DIFLAG2_BIGTIME;
|
|
|
|
/* Compute inode btree geometry. */
|
|
igeo->agino_log = sbp->sb_inopblog + sbp->sb_agblklog;
|
|
igeo->inobt_mxr[0] = xfs_inobt_maxrecs(mp, sbp->sb_blocksize, 1);
|
|
igeo->inobt_mxr[1] = xfs_inobt_maxrecs(mp, sbp->sb_blocksize, 0);
|
|
igeo->inobt_mnr[0] = igeo->inobt_mxr[0] / 2;
|
|
igeo->inobt_mnr[1] = igeo->inobt_mxr[1] / 2;
|
|
|
|
igeo->ialloc_inos = max_t(uint16_t, XFS_INODES_PER_CHUNK,
|
|
sbp->sb_inopblock);
|
|
igeo->ialloc_blks = igeo->ialloc_inos >> sbp->sb_inopblog;
|
|
|
|
if (sbp->sb_spino_align)
|
|
igeo->ialloc_min_blks = sbp->sb_spino_align;
|
|
else
|
|
igeo->ialloc_min_blks = igeo->ialloc_blks;
|
|
|
|
/* Compute and fill in value of m_ino_geo.inobt_maxlevels. */
|
|
inodes = (1LL << XFS_INO_AGINO_BITS(mp)) >> XFS_INODES_PER_CHUNK_LOG;
|
|
igeo->inobt_maxlevels = xfs_btree_compute_maxlevels(igeo->inobt_mnr,
|
|
inodes);
|
|
|
|
/*
|
|
* Set the maximum inode count for this filesystem, being careful not
|
|
* to use obviously garbage sb_inopblog/sb_inopblock values. Regular
|
|
* users should never get here due to failing sb verification, but
|
|
* certain users (xfs_db) need to be usable even with corrupt metadata.
|
|
*/
|
|
if (sbp->sb_imax_pct && igeo->ialloc_blks) {
|
|
/*
|
|
* Make sure the maximum inode count is a multiple
|
|
* of the units we allocate inodes in.
|
|
*/
|
|
icount = sbp->sb_dblocks * sbp->sb_imax_pct;
|
|
do_div(icount, 100);
|
|
do_div(icount, igeo->ialloc_blks);
|
|
igeo->maxicount = XFS_FSB_TO_INO(mp,
|
|
icount * igeo->ialloc_blks);
|
|
} else {
|
|
igeo->maxicount = 0;
|
|
}
|
|
|
|
/*
|
|
* Compute the desired size of an inode cluster buffer size, which
|
|
* starts at 8K and (on v5 filesystems) scales up with larger inode
|
|
* sizes.
|
|
*
|
|
* Preserve the desired inode cluster size because the sparse inodes
|
|
* feature uses that desired size (not the actual size) to compute the
|
|
* sparse inode alignment. The mount code validates this value, so we
|
|
* cannot change the behavior.
|
|
*/
|
|
igeo->inode_cluster_size_raw = XFS_INODE_BIG_CLUSTER_SIZE;
|
|
if (xfs_sb_version_has_v3inode(&mp->m_sb)) {
|
|
int new_size = igeo->inode_cluster_size_raw;
|
|
|
|
new_size *= mp->m_sb.sb_inodesize / XFS_DINODE_MIN_SIZE;
|
|
if (mp->m_sb.sb_inoalignmt >= XFS_B_TO_FSBT(mp, new_size))
|
|
igeo->inode_cluster_size_raw = new_size;
|
|
}
|
|
|
|
/* Calculate inode cluster ratios. */
|
|
if (igeo->inode_cluster_size_raw > mp->m_sb.sb_blocksize)
|
|
igeo->blocks_per_cluster = XFS_B_TO_FSBT(mp,
|
|
igeo->inode_cluster_size_raw);
|
|
else
|
|
igeo->blocks_per_cluster = 1;
|
|
igeo->inode_cluster_size = XFS_FSB_TO_B(mp, igeo->blocks_per_cluster);
|
|
igeo->inodes_per_cluster = XFS_FSB_TO_INO(mp, igeo->blocks_per_cluster);
|
|
|
|
/* Calculate inode cluster alignment. */
|
|
if (xfs_sb_version_hasalign(&mp->m_sb) &&
|
|
mp->m_sb.sb_inoalignmt >= igeo->blocks_per_cluster)
|
|
igeo->cluster_align = mp->m_sb.sb_inoalignmt;
|
|
else
|
|
igeo->cluster_align = 1;
|
|
igeo->inoalign_mask = igeo->cluster_align - 1;
|
|
igeo->cluster_align_inodes = XFS_FSB_TO_INO(mp, igeo->cluster_align);
|
|
|
|
/*
|
|
* If we are using stripe alignment, check whether
|
|
* the stripe unit is a multiple of the inode alignment
|
|
*/
|
|
if (mp->m_dalign && igeo->inoalign_mask &&
|
|
!(mp->m_dalign & igeo->inoalign_mask))
|
|
igeo->ialloc_align = mp->m_dalign;
|
|
else
|
|
igeo->ialloc_align = 0;
|
|
}
|
|
|
|
/* Compute the location of the root directory inode that is laid out by mkfs. */
|
|
xfs_ino_t
|
|
xfs_ialloc_calc_rootino(
|
|
struct xfs_mount *mp,
|
|
int sunit)
|
|
{
|
|
struct xfs_ino_geometry *igeo = M_IGEO(mp);
|
|
xfs_agblock_t first_bno;
|
|
|
|
/*
|
|
* Pre-calculate the geometry of AG 0. We know what it looks like
|
|
* because libxfs knows how to create allocation groups now.
|
|
*
|
|
* first_bno is the first block in which mkfs could possibly have
|
|
* allocated the root directory inode, once we factor in the metadata
|
|
* that mkfs formats before it. Namely, the four AG headers...
|
|
*/
|
|
first_bno = howmany(4 * mp->m_sb.sb_sectsize, mp->m_sb.sb_blocksize);
|
|
|
|
/* ...the two free space btree roots... */
|
|
first_bno += 2;
|
|
|
|
/* ...the inode btree root... */
|
|
first_bno += 1;
|
|
|
|
/* ...the initial AGFL... */
|
|
first_bno += xfs_alloc_min_freelist(mp, NULL);
|
|
|
|
/* ...the free inode btree root... */
|
|
if (xfs_sb_version_hasfinobt(&mp->m_sb))
|
|
first_bno++;
|
|
|
|
/* ...the reverse mapping btree root... */
|
|
if (xfs_sb_version_hasrmapbt(&mp->m_sb))
|
|
first_bno++;
|
|
|
|
/* ...the reference count btree... */
|
|
if (xfs_sb_version_hasreflink(&mp->m_sb))
|
|
first_bno++;
|
|
|
|
/*
|
|
* ...and the log, if it is allocated in the first allocation group.
|
|
*
|
|
* This can happen with filesystems that only have a single
|
|
* allocation group, or very odd geometries created by old mkfs
|
|
* versions on very small filesystems.
|
|
*/
|
|
if (mp->m_sb.sb_logstart &&
|
|
XFS_FSB_TO_AGNO(mp, mp->m_sb.sb_logstart) == 0)
|
|
first_bno += mp->m_sb.sb_logblocks;
|
|
|
|
/*
|
|
* Now round first_bno up to whatever allocation alignment is given
|
|
* by the filesystem or was passed in.
|
|
*/
|
|
if (xfs_sb_version_hasdalign(&mp->m_sb) && igeo->ialloc_align > 0)
|
|
first_bno = roundup(first_bno, sunit);
|
|
else if (xfs_sb_version_hasalign(&mp->m_sb) &&
|
|
mp->m_sb.sb_inoalignmt > 1)
|
|
first_bno = roundup(first_bno, mp->m_sb.sb_inoalignmt);
|
|
|
|
return XFS_AGINO_TO_INO(mp, 0, XFS_AGB_TO_AGINO(mp, first_bno));
|
|
}
|