mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-16 15:16:41 +07:00
90e2056d76
Prior to the introduction of reflink, allocating a block and mapping it into a file was performed in a single transaction with a single block reservation, and the allocator was supposed to find enough blocks to allocate the extent and any BMBT blocks that might be necessary (unless we're low on space). However, due to the way copy on write works, allocation and mapping have been split into two transactions, which means that we must be able to handle the case where we allocate an extent for CoW but that AG runs out of free space before the blocks can be mapped into a file, and the mapping requires a new BMBT block. When this happens, look in one of the other AGs for a BMBT block instead of taking the FS down. The same applies to the functions that convert a data fork to extents and later btree format. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Christoph Hellwig <hch@lst.de>
897 lines
23 KiB
C
897 lines
23 KiB
C
/*
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* Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
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* All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it would be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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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_mount.h"
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#include "xfs_defer.h"
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#include "xfs_inode.h"
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#include "xfs_trans.h"
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#include "xfs_inode_item.h"
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#include "xfs_alloc.h"
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#include "xfs_btree.h"
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#include "xfs_bmap_btree.h"
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#include "xfs_bmap.h"
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#include "xfs_error.h"
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#include "xfs_quota.h"
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#include "xfs_trace.h"
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#include "xfs_cksum.h"
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#include "xfs_rmap.h"
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/*
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* Determine the extent state.
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*/
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/* ARGSUSED */
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STATIC xfs_exntst_t
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xfs_extent_state(
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xfs_filblks_t blks,
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int extent_flag)
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{
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if (extent_flag) {
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ASSERT(blks != 0); /* saved for DMIG */
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return XFS_EXT_UNWRITTEN;
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}
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return XFS_EXT_NORM;
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}
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/*
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* Convert on-disk form of btree root to in-memory form.
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*/
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void
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xfs_bmdr_to_bmbt(
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struct xfs_inode *ip,
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xfs_bmdr_block_t *dblock,
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int dblocklen,
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struct xfs_btree_block *rblock,
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int rblocklen)
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{
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struct xfs_mount *mp = ip->i_mount;
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int dmxr;
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xfs_bmbt_key_t *fkp;
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__be64 *fpp;
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xfs_bmbt_key_t *tkp;
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__be64 *tpp;
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if (xfs_sb_version_hascrc(&mp->m_sb))
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xfs_btree_init_block_int(mp, rblock, XFS_BUF_DADDR_NULL,
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XFS_BMAP_CRC_MAGIC, 0, 0, ip->i_ino,
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XFS_BTREE_LONG_PTRS | XFS_BTREE_CRC_BLOCKS);
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else
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xfs_btree_init_block_int(mp, rblock, XFS_BUF_DADDR_NULL,
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XFS_BMAP_MAGIC, 0, 0, ip->i_ino,
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XFS_BTREE_LONG_PTRS);
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rblock->bb_level = dblock->bb_level;
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ASSERT(be16_to_cpu(rblock->bb_level) > 0);
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rblock->bb_numrecs = dblock->bb_numrecs;
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dmxr = xfs_bmdr_maxrecs(dblocklen, 0);
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fkp = XFS_BMDR_KEY_ADDR(dblock, 1);
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tkp = XFS_BMBT_KEY_ADDR(mp, rblock, 1);
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fpp = XFS_BMDR_PTR_ADDR(dblock, 1, dmxr);
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tpp = XFS_BMAP_BROOT_PTR_ADDR(mp, rblock, 1, rblocklen);
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dmxr = be16_to_cpu(dblock->bb_numrecs);
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memcpy(tkp, fkp, sizeof(*fkp) * dmxr);
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memcpy(tpp, fpp, sizeof(*fpp) * dmxr);
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}
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/*
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* Convert a compressed bmap extent record to an uncompressed form.
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* This code must be in sync with the routines xfs_bmbt_get_startoff,
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* xfs_bmbt_get_startblock, xfs_bmbt_get_blockcount and xfs_bmbt_get_state.
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*/
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STATIC void
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__xfs_bmbt_get_all(
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__uint64_t l0,
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__uint64_t l1,
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xfs_bmbt_irec_t *s)
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{
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int ext_flag;
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xfs_exntst_t st;
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ext_flag = (int)(l0 >> (64 - BMBT_EXNTFLAG_BITLEN));
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s->br_startoff = ((xfs_fileoff_t)l0 &
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xfs_mask64lo(64 - BMBT_EXNTFLAG_BITLEN)) >> 9;
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s->br_startblock = (((xfs_fsblock_t)l0 & xfs_mask64lo(9)) << 43) |
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(((xfs_fsblock_t)l1) >> 21);
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s->br_blockcount = (xfs_filblks_t)(l1 & xfs_mask64lo(21));
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/* This is xfs_extent_state() in-line */
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if (ext_flag) {
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ASSERT(s->br_blockcount != 0); /* saved for DMIG */
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st = XFS_EXT_UNWRITTEN;
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} else
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st = XFS_EXT_NORM;
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s->br_state = st;
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}
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void
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xfs_bmbt_get_all(
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xfs_bmbt_rec_host_t *r,
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xfs_bmbt_irec_t *s)
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{
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__xfs_bmbt_get_all(r->l0, r->l1, s);
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}
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/*
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* Extract the blockcount field from an in memory bmap extent record.
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*/
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xfs_filblks_t
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xfs_bmbt_get_blockcount(
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xfs_bmbt_rec_host_t *r)
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{
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return (xfs_filblks_t)(r->l1 & xfs_mask64lo(21));
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}
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/*
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* Extract the startblock field from an in memory bmap extent record.
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*/
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xfs_fsblock_t
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xfs_bmbt_get_startblock(
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xfs_bmbt_rec_host_t *r)
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{
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return (((xfs_fsblock_t)r->l0 & xfs_mask64lo(9)) << 43) |
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(((xfs_fsblock_t)r->l1) >> 21);
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}
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/*
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* Extract the startoff field from an in memory bmap extent record.
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*/
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xfs_fileoff_t
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xfs_bmbt_get_startoff(
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xfs_bmbt_rec_host_t *r)
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{
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return ((xfs_fileoff_t)r->l0 &
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xfs_mask64lo(64 - BMBT_EXNTFLAG_BITLEN)) >> 9;
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}
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xfs_exntst_t
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xfs_bmbt_get_state(
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xfs_bmbt_rec_host_t *r)
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{
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int ext_flag;
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ext_flag = (int)((r->l0) >> (64 - BMBT_EXNTFLAG_BITLEN));
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return xfs_extent_state(xfs_bmbt_get_blockcount(r),
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ext_flag);
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}
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/*
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* Extract the blockcount field from an on disk bmap extent record.
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*/
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xfs_filblks_t
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xfs_bmbt_disk_get_blockcount(
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xfs_bmbt_rec_t *r)
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{
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return (xfs_filblks_t)(be64_to_cpu(r->l1) & xfs_mask64lo(21));
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}
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/*
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* Extract the startoff field from a disk format bmap extent record.
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*/
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xfs_fileoff_t
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xfs_bmbt_disk_get_startoff(
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xfs_bmbt_rec_t *r)
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{
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return ((xfs_fileoff_t)be64_to_cpu(r->l0) &
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xfs_mask64lo(64 - BMBT_EXNTFLAG_BITLEN)) >> 9;
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}
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/*
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* Set all the fields in a bmap extent record from the arguments.
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*/
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void
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xfs_bmbt_set_allf(
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xfs_bmbt_rec_host_t *r,
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xfs_fileoff_t startoff,
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xfs_fsblock_t startblock,
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xfs_filblks_t blockcount,
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xfs_exntst_t state)
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{
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int extent_flag = (state == XFS_EXT_NORM) ? 0 : 1;
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ASSERT(state == XFS_EXT_NORM || state == XFS_EXT_UNWRITTEN);
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ASSERT((startoff & xfs_mask64hi(64-BMBT_STARTOFF_BITLEN)) == 0);
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ASSERT((blockcount & xfs_mask64hi(64-BMBT_BLOCKCOUNT_BITLEN)) == 0);
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ASSERT((startblock & xfs_mask64hi(64-BMBT_STARTBLOCK_BITLEN)) == 0);
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r->l0 = ((xfs_bmbt_rec_base_t)extent_flag << 63) |
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((xfs_bmbt_rec_base_t)startoff << 9) |
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((xfs_bmbt_rec_base_t)startblock >> 43);
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r->l1 = ((xfs_bmbt_rec_base_t)startblock << 21) |
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((xfs_bmbt_rec_base_t)blockcount &
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(xfs_bmbt_rec_base_t)xfs_mask64lo(21));
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}
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/*
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* Set all the fields in a bmap extent record from the uncompressed form.
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*/
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void
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xfs_bmbt_set_all(
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xfs_bmbt_rec_host_t *r,
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xfs_bmbt_irec_t *s)
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{
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xfs_bmbt_set_allf(r, s->br_startoff, s->br_startblock,
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s->br_blockcount, s->br_state);
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}
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/*
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* Set all the fields in a disk format bmap extent record from the arguments.
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*/
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void
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xfs_bmbt_disk_set_allf(
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xfs_bmbt_rec_t *r,
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xfs_fileoff_t startoff,
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xfs_fsblock_t startblock,
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xfs_filblks_t blockcount,
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xfs_exntst_t state)
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{
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int extent_flag = (state == XFS_EXT_NORM) ? 0 : 1;
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ASSERT(state == XFS_EXT_NORM || state == XFS_EXT_UNWRITTEN);
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ASSERT((startoff & xfs_mask64hi(64-BMBT_STARTOFF_BITLEN)) == 0);
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ASSERT((blockcount & xfs_mask64hi(64-BMBT_BLOCKCOUNT_BITLEN)) == 0);
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ASSERT((startblock & xfs_mask64hi(64-BMBT_STARTBLOCK_BITLEN)) == 0);
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r->l0 = cpu_to_be64(
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((xfs_bmbt_rec_base_t)extent_flag << 63) |
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((xfs_bmbt_rec_base_t)startoff << 9) |
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((xfs_bmbt_rec_base_t)startblock >> 43));
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r->l1 = cpu_to_be64(
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((xfs_bmbt_rec_base_t)startblock << 21) |
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((xfs_bmbt_rec_base_t)blockcount &
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(xfs_bmbt_rec_base_t)xfs_mask64lo(21)));
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}
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/*
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* Set all the fields in a bmap extent record from the uncompressed form.
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*/
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STATIC void
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xfs_bmbt_disk_set_all(
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xfs_bmbt_rec_t *r,
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xfs_bmbt_irec_t *s)
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{
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xfs_bmbt_disk_set_allf(r, s->br_startoff, s->br_startblock,
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s->br_blockcount, s->br_state);
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}
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/*
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* Set the blockcount field in a bmap extent record.
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*/
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void
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xfs_bmbt_set_blockcount(
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xfs_bmbt_rec_host_t *r,
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xfs_filblks_t v)
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{
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ASSERT((v & xfs_mask64hi(43)) == 0);
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r->l1 = (r->l1 & (xfs_bmbt_rec_base_t)xfs_mask64hi(43)) |
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(xfs_bmbt_rec_base_t)(v & xfs_mask64lo(21));
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}
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/*
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* Set the startblock field in a bmap extent record.
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*/
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void
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xfs_bmbt_set_startblock(
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xfs_bmbt_rec_host_t *r,
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xfs_fsblock_t v)
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{
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ASSERT((v & xfs_mask64hi(12)) == 0);
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r->l0 = (r->l0 & (xfs_bmbt_rec_base_t)xfs_mask64hi(55)) |
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(xfs_bmbt_rec_base_t)(v >> 43);
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r->l1 = (r->l1 & (xfs_bmbt_rec_base_t)xfs_mask64lo(21)) |
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(xfs_bmbt_rec_base_t)(v << 21);
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}
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/*
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* Set the startoff field in a bmap extent record.
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*/
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void
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xfs_bmbt_set_startoff(
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xfs_bmbt_rec_host_t *r,
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xfs_fileoff_t v)
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{
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ASSERT((v & xfs_mask64hi(9)) == 0);
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r->l0 = (r->l0 & (xfs_bmbt_rec_base_t) xfs_mask64hi(1)) |
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((xfs_bmbt_rec_base_t)v << 9) |
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(r->l0 & (xfs_bmbt_rec_base_t)xfs_mask64lo(9));
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}
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/*
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* Set the extent state field in a bmap extent record.
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*/
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void
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xfs_bmbt_set_state(
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xfs_bmbt_rec_host_t *r,
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xfs_exntst_t v)
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{
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ASSERT(v == XFS_EXT_NORM || v == XFS_EXT_UNWRITTEN);
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if (v == XFS_EXT_NORM)
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r->l0 &= xfs_mask64lo(64 - BMBT_EXNTFLAG_BITLEN);
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else
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r->l0 |= xfs_mask64hi(BMBT_EXNTFLAG_BITLEN);
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}
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/*
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* Convert in-memory form of btree root to on-disk form.
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*/
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void
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xfs_bmbt_to_bmdr(
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struct xfs_mount *mp,
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struct xfs_btree_block *rblock,
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int rblocklen,
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xfs_bmdr_block_t *dblock,
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int dblocklen)
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{
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int dmxr;
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xfs_bmbt_key_t *fkp;
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__be64 *fpp;
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xfs_bmbt_key_t *tkp;
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__be64 *tpp;
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if (xfs_sb_version_hascrc(&mp->m_sb)) {
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ASSERT(rblock->bb_magic == cpu_to_be32(XFS_BMAP_CRC_MAGIC));
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ASSERT(uuid_equal(&rblock->bb_u.l.bb_uuid,
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&mp->m_sb.sb_meta_uuid));
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ASSERT(rblock->bb_u.l.bb_blkno ==
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cpu_to_be64(XFS_BUF_DADDR_NULL));
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} else
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ASSERT(rblock->bb_magic == cpu_to_be32(XFS_BMAP_MAGIC));
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ASSERT(rblock->bb_u.l.bb_leftsib == cpu_to_be64(NULLFSBLOCK));
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ASSERT(rblock->bb_u.l.bb_rightsib == cpu_to_be64(NULLFSBLOCK));
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ASSERT(rblock->bb_level != 0);
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dblock->bb_level = rblock->bb_level;
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dblock->bb_numrecs = rblock->bb_numrecs;
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dmxr = xfs_bmdr_maxrecs(dblocklen, 0);
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fkp = XFS_BMBT_KEY_ADDR(mp, rblock, 1);
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tkp = XFS_BMDR_KEY_ADDR(dblock, 1);
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fpp = XFS_BMAP_BROOT_PTR_ADDR(mp, rblock, 1, rblocklen);
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tpp = XFS_BMDR_PTR_ADDR(dblock, 1, dmxr);
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dmxr = be16_to_cpu(dblock->bb_numrecs);
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memcpy(tkp, fkp, sizeof(*fkp) * dmxr);
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memcpy(tpp, fpp, sizeof(*fpp) * dmxr);
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}
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/*
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* Check extent records, which have just been read, for
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* any bit in the extent flag field. ASSERT on debug
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* kernels, as this condition should not occur.
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* Return an error condition (1) if any flags found,
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* otherwise return 0.
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*/
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int
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xfs_check_nostate_extents(
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xfs_ifork_t *ifp,
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xfs_extnum_t idx,
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xfs_extnum_t num)
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{
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for (; num > 0; num--, idx++) {
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xfs_bmbt_rec_host_t *ep = xfs_iext_get_ext(ifp, idx);
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if ((ep->l0 >>
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(64 - BMBT_EXNTFLAG_BITLEN)) != 0) {
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ASSERT(0);
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return 1;
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}
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}
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return 0;
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}
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STATIC struct xfs_btree_cur *
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xfs_bmbt_dup_cursor(
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struct xfs_btree_cur *cur)
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{
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struct xfs_btree_cur *new;
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new = xfs_bmbt_init_cursor(cur->bc_mp, cur->bc_tp,
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cur->bc_private.b.ip, cur->bc_private.b.whichfork);
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/*
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* Copy the firstblock, dfops, and flags values,
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* since init cursor doesn't get them.
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*/
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new->bc_private.b.firstblock = cur->bc_private.b.firstblock;
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new->bc_private.b.dfops = cur->bc_private.b.dfops;
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new->bc_private.b.flags = cur->bc_private.b.flags;
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return new;
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}
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STATIC void
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xfs_bmbt_update_cursor(
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struct xfs_btree_cur *src,
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struct xfs_btree_cur *dst)
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{
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ASSERT((dst->bc_private.b.firstblock != NULLFSBLOCK) ||
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(dst->bc_private.b.ip->i_d.di_flags & XFS_DIFLAG_REALTIME));
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ASSERT(dst->bc_private.b.dfops == src->bc_private.b.dfops);
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dst->bc_private.b.allocated += src->bc_private.b.allocated;
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dst->bc_private.b.firstblock = src->bc_private.b.firstblock;
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src->bc_private.b.allocated = 0;
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}
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STATIC int
|
|
xfs_bmbt_alloc_block(
|
|
struct xfs_btree_cur *cur,
|
|
union xfs_btree_ptr *start,
|
|
union xfs_btree_ptr *new,
|
|
int *stat)
|
|
{
|
|
xfs_alloc_arg_t args; /* block allocation args */
|
|
int error; /* error return value */
|
|
|
|
memset(&args, 0, sizeof(args));
|
|
args.tp = cur->bc_tp;
|
|
args.mp = cur->bc_mp;
|
|
args.fsbno = cur->bc_private.b.firstblock;
|
|
args.firstblock = args.fsbno;
|
|
xfs_rmap_ino_bmbt_owner(&args.oinfo, cur->bc_private.b.ip->i_ino,
|
|
cur->bc_private.b.whichfork);
|
|
|
|
if (args.fsbno == NULLFSBLOCK) {
|
|
args.fsbno = be64_to_cpu(start->l);
|
|
try_another_ag:
|
|
args.type = XFS_ALLOCTYPE_START_BNO;
|
|
/*
|
|
* Make sure there is sufficient room left in the AG to
|
|
* complete a full tree split for an extent insert. If
|
|
* we are converting the middle part of an extent then
|
|
* we may need space for two tree splits.
|
|
*
|
|
* We are relying on the caller to make the correct block
|
|
* reservation for this operation to succeed. If the
|
|
* reservation amount is insufficient then we may fail a
|
|
* block allocation here and corrupt the filesystem.
|
|
*/
|
|
args.minleft = args.tp->t_blk_res;
|
|
} else if (cur->bc_private.b.dfops->dop_low) {
|
|
args.type = XFS_ALLOCTYPE_START_BNO;
|
|
} else {
|
|
args.type = XFS_ALLOCTYPE_NEAR_BNO;
|
|
}
|
|
|
|
args.minlen = args.maxlen = args.prod = 1;
|
|
args.wasdel = cur->bc_private.b.flags & XFS_BTCUR_BPRV_WASDEL;
|
|
if (!args.wasdel && args.tp->t_blk_res == 0) {
|
|
error = -ENOSPC;
|
|
goto error0;
|
|
}
|
|
error = xfs_alloc_vextent(&args);
|
|
if (error)
|
|
goto error0;
|
|
|
|
/*
|
|
* During a CoW operation, the allocation and bmbt updates occur in
|
|
* different transactions. The mapping code tries to put new bmbt
|
|
* blocks near extents being mapped, but the only way to guarantee this
|
|
* is if the alloc and the mapping happen in a single transaction that
|
|
* has a block reservation. That isn't the case here, so if we run out
|
|
* of space we'll try again with another AG.
|
|
*/
|
|
if (xfs_sb_version_hasreflink(&cur->bc_mp->m_sb) &&
|
|
args.fsbno == NULLFSBLOCK &&
|
|
args.type == XFS_ALLOCTYPE_NEAR_BNO) {
|
|
cur->bc_private.b.dfops->dop_low = true;
|
|
args.fsbno = cur->bc_private.b.firstblock;
|
|
goto try_another_ag;
|
|
}
|
|
|
|
if (args.fsbno == NULLFSBLOCK && args.minleft) {
|
|
/*
|
|
* Could not find an AG with enough free space to satisfy
|
|
* a full btree split. Try again without minleft and if
|
|
* successful activate the lowspace algorithm.
|
|
*/
|
|
args.fsbno = 0;
|
|
args.type = XFS_ALLOCTYPE_FIRST_AG;
|
|
args.minleft = 0;
|
|
error = xfs_alloc_vextent(&args);
|
|
if (error)
|
|
goto error0;
|
|
cur->bc_private.b.dfops->dop_low = true;
|
|
}
|
|
if (args.fsbno == NULLFSBLOCK) {
|
|
XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
|
|
*stat = 0;
|
|
return 0;
|
|
}
|
|
ASSERT(args.len == 1);
|
|
cur->bc_private.b.firstblock = args.fsbno;
|
|
cur->bc_private.b.allocated++;
|
|
cur->bc_private.b.ip->i_d.di_nblocks++;
|
|
xfs_trans_log_inode(args.tp, cur->bc_private.b.ip, XFS_ILOG_CORE);
|
|
xfs_trans_mod_dquot_byino(args.tp, cur->bc_private.b.ip,
|
|
XFS_TRANS_DQ_BCOUNT, 1L);
|
|
|
|
new->l = cpu_to_be64(args.fsbno);
|
|
|
|
XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
|
|
*stat = 1;
|
|
return 0;
|
|
|
|
error0:
|
|
XFS_BTREE_TRACE_CURSOR(cur, XBT_ERROR);
|
|
return error;
|
|
}
|
|
|
|
STATIC int
|
|
xfs_bmbt_free_block(
|
|
struct xfs_btree_cur *cur,
|
|
struct xfs_buf *bp)
|
|
{
|
|
struct xfs_mount *mp = cur->bc_mp;
|
|
struct xfs_inode *ip = cur->bc_private.b.ip;
|
|
struct xfs_trans *tp = cur->bc_tp;
|
|
xfs_fsblock_t fsbno = XFS_DADDR_TO_FSB(mp, XFS_BUF_ADDR(bp));
|
|
struct xfs_owner_info oinfo;
|
|
|
|
xfs_rmap_ino_bmbt_owner(&oinfo, ip->i_ino, cur->bc_private.b.whichfork);
|
|
xfs_bmap_add_free(mp, cur->bc_private.b.dfops, fsbno, 1, &oinfo);
|
|
ip->i_d.di_nblocks--;
|
|
|
|
xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
|
|
xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_BCOUNT, -1L);
|
|
return 0;
|
|
}
|
|
|
|
STATIC int
|
|
xfs_bmbt_get_minrecs(
|
|
struct xfs_btree_cur *cur,
|
|
int level)
|
|
{
|
|
if (level == cur->bc_nlevels - 1) {
|
|
struct xfs_ifork *ifp;
|
|
|
|
ifp = XFS_IFORK_PTR(cur->bc_private.b.ip,
|
|
cur->bc_private.b.whichfork);
|
|
|
|
return xfs_bmbt_maxrecs(cur->bc_mp,
|
|
ifp->if_broot_bytes, level == 0) / 2;
|
|
}
|
|
|
|
return cur->bc_mp->m_bmap_dmnr[level != 0];
|
|
}
|
|
|
|
int
|
|
xfs_bmbt_get_maxrecs(
|
|
struct xfs_btree_cur *cur,
|
|
int level)
|
|
{
|
|
if (level == cur->bc_nlevels - 1) {
|
|
struct xfs_ifork *ifp;
|
|
|
|
ifp = XFS_IFORK_PTR(cur->bc_private.b.ip,
|
|
cur->bc_private.b.whichfork);
|
|
|
|
return xfs_bmbt_maxrecs(cur->bc_mp,
|
|
ifp->if_broot_bytes, level == 0);
|
|
}
|
|
|
|
return cur->bc_mp->m_bmap_dmxr[level != 0];
|
|
|
|
}
|
|
|
|
/*
|
|
* Get the maximum records we could store in the on-disk format.
|
|
*
|
|
* For non-root nodes this is equivalent to xfs_bmbt_get_maxrecs, but
|
|
* for the root node this checks the available space in the dinode fork
|
|
* so that we can resize the in-memory buffer to match it. After a
|
|
* resize to the maximum size this function returns the same value
|
|
* as xfs_bmbt_get_maxrecs for the root node, too.
|
|
*/
|
|
STATIC int
|
|
xfs_bmbt_get_dmaxrecs(
|
|
struct xfs_btree_cur *cur,
|
|
int level)
|
|
{
|
|
if (level != cur->bc_nlevels - 1)
|
|
return cur->bc_mp->m_bmap_dmxr[level != 0];
|
|
return xfs_bmdr_maxrecs(cur->bc_private.b.forksize, level == 0);
|
|
}
|
|
|
|
STATIC void
|
|
xfs_bmbt_init_key_from_rec(
|
|
union xfs_btree_key *key,
|
|
union xfs_btree_rec *rec)
|
|
{
|
|
key->bmbt.br_startoff =
|
|
cpu_to_be64(xfs_bmbt_disk_get_startoff(&rec->bmbt));
|
|
}
|
|
|
|
STATIC void
|
|
xfs_bmbt_init_rec_from_cur(
|
|
struct xfs_btree_cur *cur,
|
|
union xfs_btree_rec *rec)
|
|
{
|
|
xfs_bmbt_disk_set_all(&rec->bmbt, &cur->bc_rec.b);
|
|
}
|
|
|
|
STATIC void
|
|
xfs_bmbt_init_ptr_from_cur(
|
|
struct xfs_btree_cur *cur,
|
|
union xfs_btree_ptr *ptr)
|
|
{
|
|
ptr->l = 0;
|
|
}
|
|
|
|
STATIC __int64_t
|
|
xfs_bmbt_key_diff(
|
|
struct xfs_btree_cur *cur,
|
|
union xfs_btree_key *key)
|
|
{
|
|
return (__int64_t)be64_to_cpu(key->bmbt.br_startoff) -
|
|
cur->bc_rec.b.br_startoff;
|
|
}
|
|
|
|
static bool
|
|
xfs_bmbt_verify(
|
|
struct xfs_buf *bp)
|
|
{
|
|
struct xfs_mount *mp = bp->b_target->bt_mount;
|
|
struct xfs_btree_block *block = XFS_BUF_TO_BLOCK(bp);
|
|
unsigned int level;
|
|
|
|
switch (block->bb_magic) {
|
|
case cpu_to_be32(XFS_BMAP_CRC_MAGIC):
|
|
if (!xfs_sb_version_hascrc(&mp->m_sb))
|
|
return false;
|
|
if (!uuid_equal(&block->bb_u.l.bb_uuid, &mp->m_sb.sb_meta_uuid))
|
|
return false;
|
|
if (be64_to_cpu(block->bb_u.l.bb_blkno) != bp->b_bn)
|
|
return false;
|
|
/*
|
|
* XXX: need a better way of verifying the owner here. Right now
|
|
* just make sure there has been one set.
|
|
*/
|
|
if (be64_to_cpu(block->bb_u.l.bb_owner) == 0)
|
|
return false;
|
|
/* fall through */
|
|
case cpu_to_be32(XFS_BMAP_MAGIC):
|
|
break;
|
|
default:
|
|
return false;
|
|
}
|
|
|
|
/*
|
|
* numrecs and level verification.
|
|
*
|
|
* We don't know what fork we belong to, so just verify that the level
|
|
* is less than the maximum of the two. Later checks will be more
|
|
* precise.
|
|
*/
|
|
level = be16_to_cpu(block->bb_level);
|
|
if (level > max(mp->m_bm_maxlevels[0], mp->m_bm_maxlevels[1]))
|
|
return false;
|
|
if (be16_to_cpu(block->bb_numrecs) > mp->m_bmap_dmxr[level != 0])
|
|
return false;
|
|
|
|
/* sibling pointer verification */
|
|
if (!block->bb_u.l.bb_leftsib ||
|
|
(block->bb_u.l.bb_leftsib != cpu_to_be64(NULLFSBLOCK) &&
|
|
!XFS_FSB_SANITY_CHECK(mp, be64_to_cpu(block->bb_u.l.bb_leftsib))))
|
|
return false;
|
|
if (!block->bb_u.l.bb_rightsib ||
|
|
(block->bb_u.l.bb_rightsib != cpu_to_be64(NULLFSBLOCK) &&
|
|
!XFS_FSB_SANITY_CHECK(mp, be64_to_cpu(block->bb_u.l.bb_rightsib))))
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
static void
|
|
xfs_bmbt_read_verify(
|
|
struct xfs_buf *bp)
|
|
{
|
|
if (!xfs_btree_lblock_verify_crc(bp))
|
|
xfs_buf_ioerror(bp, -EFSBADCRC);
|
|
else if (!xfs_bmbt_verify(bp))
|
|
xfs_buf_ioerror(bp, -EFSCORRUPTED);
|
|
|
|
if (bp->b_error) {
|
|
trace_xfs_btree_corrupt(bp, _RET_IP_);
|
|
xfs_verifier_error(bp);
|
|
}
|
|
}
|
|
|
|
static void
|
|
xfs_bmbt_write_verify(
|
|
struct xfs_buf *bp)
|
|
{
|
|
if (!xfs_bmbt_verify(bp)) {
|
|
trace_xfs_btree_corrupt(bp, _RET_IP_);
|
|
xfs_buf_ioerror(bp, -EFSCORRUPTED);
|
|
xfs_verifier_error(bp);
|
|
return;
|
|
}
|
|
xfs_btree_lblock_calc_crc(bp);
|
|
}
|
|
|
|
const struct xfs_buf_ops xfs_bmbt_buf_ops = {
|
|
.name = "xfs_bmbt",
|
|
.verify_read = xfs_bmbt_read_verify,
|
|
.verify_write = xfs_bmbt_write_verify,
|
|
};
|
|
|
|
|
|
#if defined(DEBUG) || defined(XFS_WARN)
|
|
STATIC int
|
|
xfs_bmbt_keys_inorder(
|
|
struct xfs_btree_cur *cur,
|
|
union xfs_btree_key *k1,
|
|
union xfs_btree_key *k2)
|
|
{
|
|
return be64_to_cpu(k1->bmbt.br_startoff) <
|
|
be64_to_cpu(k2->bmbt.br_startoff);
|
|
}
|
|
|
|
STATIC int
|
|
xfs_bmbt_recs_inorder(
|
|
struct xfs_btree_cur *cur,
|
|
union xfs_btree_rec *r1,
|
|
union xfs_btree_rec *r2)
|
|
{
|
|
return xfs_bmbt_disk_get_startoff(&r1->bmbt) +
|
|
xfs_bmbt_disk_get_blockcount(&r1->bmbt) <=
|
|
xfs_bmbt_disk_get_startoff(&r2->bmbt);
|
|
}
|
|
#endif /* DEBUG */
|
|
|
|
static const struct xfs_btree_ops xfs_bmbt_ops = {
|
|
.rec_len = sizeof(xfs_bmbt_rec_t),
|
|
.key_len = sizeof(xfs_bmbt_key_t),
|
|
|
|
.dup_cursor = xfs_bmbt_dup_cursor,
|
|
.update_cursor = xfs_bmbt_update_cursor,
|
|
.alloc_block = xfs_bmbt_alloc_block,
|
|
.free_block = xfs_bmbt_free_block,
|
|
.get_maxrecs = xfs_bmbt_get_maxrecs,
|
|
.get_minrecs = xfs_bmbt_get_minrecs,
|
|
.get_dmaxrecs = xfs_bmbt_get_dmaxrecs,
|
|
.init_key_from_rec = xfs_bmbt_init_key_from_rec,
|
|
.init_rec_from_cur = xfs_bmbt_init_rec_from_cur,
|
|
.init_ptr_from_cur = xfs_bmbt_init_ptr_from_cur,
|
|
.key_diff = xfs_bmbt_key_diff,
|
|
.buf_ops = &xfs_bmbt_buf_ops,
|
|
#if defined(DEBUG) || defined(XFS_WARN)
|
|
.keys_inorder = xfs_bmbt_keys_inorder,
|
|
.recs_inorder = xfs_bmbt_recs_inorder,
|
|
#endif
|
|
};
|
|
|
|
/*
|
|
* Allocate a new bmap btree cursor.
|
|
*/
|
|
struct xfs_btree_cur * /* new bmap btree cursor */
|
|
xfs_bmbt_init_cursor(
|
|
struct xfs_mount *mp, /* file system mount point */
|
|
struct xfs_trans *tp, /* transaction pointer */
|
|
struct xfs_inode *ip, /* inode owning the btree */
|
|
int whichfork) /* data or attr fork */
|
|
{
|
|
struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork);
|
|
struct xfs_btree_cur *cur;
|
|
ASSERT(whichfork != XFS_COW_FORK);
|
|
|
|
cur = kmem_zone_zalloc(xfs_btree_cur_zone, KM_SLEEP);
|
|
|
|
cur->bc_tp = tp;
|
|
cur->bc_mp = mp;
|
|
cur->bc_nlevels = be16_to_cpu(ifp->if_broot->bb_level) + 1;
|
|
cur->bc_btnum = XFS_BTNUM_BMAP;
|
|
cur->bc_blocklog = mp->m_sb.sb_blocklog;
|
|
|
|
cur->bc_ops = &xfs_bmbt_ops;
|
|
cur->bc_flags = XFS_BTREE_LONG_PTRS | XFS_BTREE_ROOT_IN_INODE;
|
|
if (xfs_sb_version_hascrc(&mp->m_sb))
|
|
cur->bc_flags |= XFS_BTREE_CRC_BLOCKS;
|
|
|
|
cur->bc_private.b.forksize = XFS_IFORK_SIZE(ip, whichfork);
|
|
cur->bc_private.b.ip = ip;
|
|
cur->bc_private.b.firstblock = NULLFSBLOCK;
|
|
cur->bc_private.b.dfops = NULL;
|
|
cur->bc_private.b.allocated = 0;
|
|
cur->bc_private.b.flags = 0;
|
|
cur->bc_private.b.whichfork = whichfork;
|
|
|
|
return cur;
|
|
}
|
|
|
|
/*
|
|
* Calculate number of records in a bmap btree block.
|
|
*/
|
|
int
|
|
xfs_bmbt_maxrecs(
|
|
struct xfs_mount *mp,
|
|
int blocklen,
|
|
int leaf)
|
|
{
|
|
blocklen -= XFS_BMBT_BLOCK_LEN(mp);
|
|
|
|
if (leaf)
|
|
return blocklen / sizeof(xfs_bmbt_rec_t);
|
|
return blocklen / (sizeof(xfs_bmbt_key_t) + sizeof(xfs_bmbt_ptr_t));
|
|
}
|
|
|
|
/*
|
|
* Calculate number of records in a bmap btree inode root.
|
|
*/
|
|
int
|
|
xfs_bmdr_maxrecs(
|
|
int blocklen,
|
|
int leaf)
|
|
{
|
|
blocklen -= sizeof(xfs_bmdr_block_t);
|
|
|
|
if (leaf)
|
|
return blocklen / sizeof(xfs_bmdr_rec_t);
|
|
return blocklen / (sizeof(xfs_bmdr_key_t) + sizeof(xfs_bmdr_ptr_t));
|
|
}
|
|
|
|
/*
|
|
* Change the owner of a btree format fork fo the inode passed in. Change it to
|
|
* the owner of that is passed in so that we can change owners before or after
|
|
* we switch forks between inodes. The operation that the caller is doing will
|
|
* determine whether is needs to change owner before or after the switch.
|
|
*
|
|
* For demand paged transactional modification, the fork switch should be done
|
|
* after reading in all the blocks, modifying them and pinning them in the
|
|
* transaction. For modification when the buffers are already pinned in memory,
|
|
* the fork switch can be done before changing the owner as we won't need to
|
|
* validate the owner until the btree buffers are unpinned and writes can occur
|
|
* again.
|
|
*
|
|
* For recovery based ownership change, there is no transactional context and
|
|
* so a buffer list must be supplied so that we can record the buffers that we
|
|
* modified for the caller to issue IO on.
|
|
*/
|
|
int
|
|
xfs_bmbt_change_owner(
|
|
struct xfs_trans *tp,
|
|
struct xfs_inode *ip,
|
|
int whichfork,
|
|
xfs_ino_t new_owner,
|
|
struct list_head *buffer_list)
|
|
{
|
|
struct xfs_btree_cur *cur;
|
|
int error;
|
|
|
|
ASSERT(tp || buffer_list);
|
|
ASSERT(!(tp && buffer_list));
|
|
if (whichfork == XFS_DATA_FORK)
|
|
ASSERT(ip->i_d.di_format == XFS_DINODE_FMT_BTREE);
|
|
else
|
|
ASSERT(ip->i_d.di_aformat == XFS_DINODE_FMT_BTREE);
|
|
|
|
cur = xfs_bmbt_init_cursor(ip->i_mount, tp, ip, whichfork);
|
|
if (!cur)
|
|
return -ENOMEM;
|
|
|
|
error = xfs_btree_change_owner(cur, new_owner, buffer_list);
|
|
xfs_btree_del_cursor(cur, error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);
|
|
return error;
|
|
}
|