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627 lines
15 KiB
627 lines
15 KiB
/*
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* Copyright (c) 2000-2005 Silicon Graphics, Inc.
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* Copyright (c) 2013 Red Hat, 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_sb.h"
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#include "xfs_ag.h"
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#include "xfs_mount.h"
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#include "xfs_da_format.h"
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#include "xfs_da_btree.h"
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#include "xfs_inode.h"
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#include "xfs_alloc.h"
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#include "xfs_trans.h"
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#include "xfs_inode_item.h"
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#include "xfs_bmap.h"
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#include "xfs_bmap_util.h"
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#include "xfs_attr.h"
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#include "xfs_attr_leaf.h"
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#include "xfs_attr_remote.h"
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#include "xfs_trans_space.h"
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#include "xfs_trace.h"
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#include "xfs_cksum.h"
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#include "xfs_buf_item.h"
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#include "xfs_error.h"
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#define ATTR_RMTVALUE_MAPSIZE 1 /* # of map entries at once */
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/*
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* Each contiguous block has a header, so it is not just a simple attribute
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* length to FSB conversion.
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*/
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int
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xfs_attr3_rmt_blocks(
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struct xfs_mount *mp,
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int attrlen)
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{
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if (xfs_sb_version_hascrc(&mp->m_sb)) {
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int buflen = XFS_ATTR3_RMT_BUF_SPACE(mp, mp->m_sb.sb_blocksize);
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return (attrlen + buflen - 1) / buflen;
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}
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return XFS_B_TO_FSB(mp, attrlen);
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}
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/*
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* Checking of the remote attribute header is split into two parts. The verifier
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* does CRC, location and bounds checking, the unpacking function checks the
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* attribute parameters and owner.
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*/
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static bool
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xfs_attr3_rmt_hdr_ok(
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struct xfs_mount *mp,
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void *ptr,
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xfs_ino_t ino,
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uint32_t offset,
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uint32_t size,
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xfs_daddr_t bno)
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{
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struct xfs_attr3_rmt_hdr *rmt = ptr;
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if (bno != be64_to_cpu(rmt->rm_blkno))
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return false;
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if (offset != be32_to_cpu(rmt->rm_offset))
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return false;
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if (size != be32_to_cpu(rmt->rm_bytes))
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return false;
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if (ino != be64_to_cpu(rmt->rm_owner))
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return false;
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/* ok */
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return true;
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}
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static bool
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xfs_attr3_rmt_verify(
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struct xfs_mount *mp,
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void *ptr,
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int fsbsize,
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xfs_daddr_t bno)
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{
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struct xfs_attr3_rmt_hdr *rmt = ptr;
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if (!xfs_sb_version_hascrc(&mp->m_sb))
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return false;
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if (rmt->rm_magic != cpu_to_be32(XFS_ATTR3_RMT_MAGIC))
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return false;
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if (!uuid_equal(&rmt->rm_uuid, &mp->m_sb.sb_uuid))
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return false;
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if (be64_to_cpu(rmt->rm_blkno) != bno)
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return false;
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if (be32_to_cpu(rmt->rm_bytes) > fsbsize - sizeof(*rmt))
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return false;
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if (be32_to_cpu(rmt->rm_offset) +
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be32_to_cpu(rmt->rm_bytes) > XATTR_SIZE_MAX)
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return false;
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if (rmt->rm_owner == 0)
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return false;
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return true;
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}
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static void
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xfs_attr3_rmt_read_verify(
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struct xfs_buf *bp)
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{
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struct xfs_mount *mp = bp->b_target->bt_mount;
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char *ptr;
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int len;
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bool corrupt = false;
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xfs_daddr_t bno;
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/* no verification of non-crc buffers */
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if (!xfs_sb_version_hascrc(&mp->m_sb))
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return;
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ptr = bp->b_addr;
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bno = bp->b_bn;
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len = BBTOB(bp->b_length);
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ASSERT(len >= XFS_LBSIZE(mp));
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while (len > 0) {
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if (!xfs_verify_cksum(ptr, XFS_LBSIZE(mp),
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XFS_ATTR3_RMT_CRC_OFF)) {
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corrupt = true;
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break;
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}
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if (!xfs_attr3_rmt_verify(mp, ptr, XFS_LBSIZE(mp), bno)) {
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corrupt = true;
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break;
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}
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len -= XFS_LBSIZE(mp);
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ptr += XFS_LBSIZE(mp);
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bno += mp->m_bsize;
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}
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if (corrupt) {
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XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp, bp->b_addr);
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xfs_buf_ioerror(bp, EFSCORRUPTED);
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} else
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ASSERT(len == 0);
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}
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static void
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xfs_attr3_rmt_write_verify(
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struct xfs_buf *bp)
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{
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struct xfs_mount *mp = bp->b_target->bt_mount;
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struct xfs_buf_log_item *bip = bp->b_fspriv;
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char *ptr;
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int len;
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xfs_daddr_t bno;
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/* no verification of non-crc buffers */
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if (!xfs_sb_version_hascrc(&mp->m_sb))
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return;
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ptr = bp->b_addr;
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bno = bp->b_bn;
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len = BBTOB(bp->b_length);
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ASSERT(len >= XFS_LBSIZE(mp));
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while (len > 0) {
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if (!xfs_attr3_rmt_verify(mp, ptr, XFS_LBSIZE(mp), bno)) {
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XFS_CORRUPTION_ERROR(__func__,
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XFS_ERRLEVEL_LOW, mp, bp->b_addr);
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xfs_buf_ioerror(bp, EFSCORRUPTED);
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return;
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}
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if (bip) {
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struct xfs_attr3_rmt_hdr *rmt;
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rmt = (struct xfs_attr3_rmt_hdr *)ptr;
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rmt->rm_lsn = cpu_to_be64(bip->bli_item.li_lsn);
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}
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xfs_update_cksum(ptr, XFS_LBSIZE(mp), XFS_ATTR3_RMT_CRC_OFF);
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len -= XFS_LBSIZE(mp);
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ptr += XFS_LBSIZE(mp);
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bno += mp->m_bsize;
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}
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ASSERT(len == 0);
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}
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const struct xfs_buf_ops xfs_attr3_rmt_buf_ops = {
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.verify_read = xfs_attr3_rmt_read_verify,
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.verify_write = xfs_attr3_rmt_write_verify,
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};
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STATIC int
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xfs_attr3_rmt_hdr_set(
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struct xfs_mount *mp,
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void *ptr,
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xfs_ino_t ino,
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uint32_t offset,
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uint32_t size,
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xfs_daddr_t bno)
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{
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struct xfs_attr3_rmt_hdr *rmt = ptr;
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if (!xfs_sb_version_hascrc(&mp->m_sb))
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return 0;
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rmt->rm_magic = cpu_to_be32(XFS_ATTR3_RMT_MAGIC);
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rmt->rm_offset = cpu_to_be32(offset);
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rmt->rm_bytes = cpu_to_be32(size);
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uuid_copy(&rmt->rm_uuid, &mp->m_sb.sb_uuid);
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rmt->rm_owner = cpu_to_be64(ino);
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rmt->rm_blkno = cpu_to_be64(bno);
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return sizeof(struct xfs_attr3_rmt_hdr);
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}
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/*
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* Helper functions to copy attribute data in and out of the one disk extents
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*/
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STATIC int
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xfs_attr_rmtval_copyout(
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struct xfs_mount *mp,
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struct xfs_buf *bp,
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xfs_ino_t ino,
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int *offset,
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int *valuelen,
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__uint8_t **dst)
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{
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char *src = bp->b_addr;
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xfs_daddr_t bno = bp->b_bn;
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int len = BBTOB(bp->b_length);
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ASSERT(len >= XFS_LBSIZE(mp));
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while (len > 0 && *valuelen > 0) {
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int hdr_size = 0;
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int byte_cnt = XFS_ATTR3_RMT_BUF_SPACE(mp, XFS_LBSIZE(mp));
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byte_cnt = min(*valuelen, byte_cnt);
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if (xfs_sb_version_hascrc(&mp->m_sb)) {
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if (!xfs_attr3_rmt_hdr_ok(mp, src, ino, *offset,
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byte_cnt, bno)) {
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xfs_alert(mp,
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"remote attribute header mismatch bno/off/len/owner (0x%llx/0x%x/Ox%x/0x%llx)",
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bno, *offset, byte_cnt, ino);
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return EFSCORRUPTED;
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}
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hdr_size = sizeof(struct xfs_attr3_rmt_hdr);
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}
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memcpy(*dst, src + hdr_size, byte_cnt);
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/* roll buffer forwards */
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len -= XFS_LBSIZE(mp);
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src += XFS_LBSIZE(mp);
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bno += mp->m_bsize;
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/* roll attribute data forwards */
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*valuelen -= byte_cnt;
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*dst += byte_cnt;
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*offset += byte_cnt;
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}
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return 0;
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}
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STATIC void
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xfs_attr_rmtval_copyin(
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struct xfs_mount *mp,
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struct xfs_buf *bp,
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xfs_ino_t ino,
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int *offset,
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int *valuelen,
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__uint8_t **src)
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{
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char *dst = bp->b_addr;
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xfs_daddr_t bno = bp->b_bn;
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int len = BBTOB(bp->b_length);
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ASSERT(len >= XFS_LBSIZE(mp));
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while (len > 0 && *valuelen > 0) {
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int hdr_size;
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int byte_cnt = XFS_ATTR3_RMT_BUF_SPACE(mp, XFS_LBSIZE(mp));
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byte_cnt = min(*valuelen, byte_cnt);
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hdr_size = xfs_attr3_rmt_hdr_set(mp, dst, ino, *offset,
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byte_cnt, bno);
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memcpy(dst + hdr_size, *src, byte_cnt);
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/*
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* If this is the last block, zero the remainder of it.
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* Check that we are actually the last block, too.
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*/
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if (byte_cnt + hdr_size < XFS_LBSIZE(mp)) {
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ASSERT(*valuelen - byte_cnt == 0);
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ASSERT(len == XFS_LBSIZE(mp));
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memset(dst + hdr_size + byte_cnt, 0,
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XFS_LBSIZE(mp) - hdr_size - byte_cnt);
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}
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/* roll buffer forwards */
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len -= XFS_LBSIZE(mp);
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dst += XFS_LBSIZE(mp);
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bno += mp->m_bsize;
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/* roll attribute data forwards */
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*valuelen -= byte_cnt;
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*src += byte_cnt;
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*offset += byte_cnt;
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}
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}
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/*
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* Read the value associated with an attribute from the out-of-line buffer
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* that we stored it in.
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*/
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int
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xfs_attr_rmtval_get(
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struct xfs_da_args *args)
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{
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struct xfs_bmbt_irec map[ATTR_RMTVALUE_MAPSIZE];
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struct xfs_mount *mp = args->dp->i_mount;
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struct xfs_buf *bp;
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xfs_dablk_t lblkno = args->rmtblkno;
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__uint8_t *dst = args->value;
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int valuelen = args->valuelen;
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int nmap;
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int error;
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int blkcnt = args->rmtblkcnt;
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int i;
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int offset = 0;
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trace_xfs_attr_rmtval_get(args);
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ASSERT(!(args->flags & ATTR_KERNOVAL));
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while (valuelen > 0) {
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nmap = ATTR_RMTVALUE_MAPSIZE;
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error = xfs_bmapi_read(args->dp, (xfs_fileoff_t)lblkno,
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blkcnt, map, &nmap,
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XFS_BMAPI_ATTRFORK);
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if (error)
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return error;
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ASSERT(nmap >= 1);
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for (i = 0; (i < nmap) && (valuelen > 0); i++) {
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xfs_daddr_t dblkno;
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int dblkcnt;
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ASSERT((map[i].br_startblock != DELAYSTARTBLOCK) &&
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(map[i].br_startblock != HOLESTARTBLOCK));
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dblkno = XFS_FSB_TO_DADDR(mp, map[i].br_startblock);
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dblkcnt = XFS_FSB_TO_BB(mp, map[i].br_blockcount);
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error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
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dblkno, dblkcnt, 0, &bp,
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&xfs_attr3_rmt_buf_ops);
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if (error)
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return error;
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error = xfs_attr_rmtval_copyout(mp, bp, args->dp->i_ino,
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&offset, &valuelen,
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&dst);
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xfs_buf_relse(bp);
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if (error)
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return error;
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/* roll attribute extent map forwards */
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lblkno += map[i].br_blockcount;
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blkcnt -= map[i].br_blockcount;
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}
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}
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ASSERT(valuelen == 0);
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return 0;
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}
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/*
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* Write the value associated with an attribute into the out-of-line buffer
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* that we have defined for it.
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*/
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int
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xfs_attr_rmtval_set(
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struct xfs_da_args *args)
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{
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struct xfs_inode *dp = args->dp;
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struct xfs_mount *mp = dp->i_mount;
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struct xfs_bmbt_irec map;
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xfs_dablk_t lblkno;
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xfs_fileoff_t lfileoff = 0;
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__uint8_t *src = args->value;
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int blkcnt;
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int valuelen;
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int nmap;
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int error;
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int offset = 0;
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trace_xfs_attr_rmtval_set(args);
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/*
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* Find a "hole" in the attribute address space large enough for
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* us to drop the new attribute's value into. Because CRC enable
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* attributes have headers, we can't just do a straight byte to FSB
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* conversion and have to take the header space into account.
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*/
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blkcnt = xfs_attr3_rmt_blocks(mp, args->valuelen);
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error = xfs_bmap_first_unused(args->trans, args->dp, blkcnt, &lfileoff,
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XFS_ATTR_FORK);
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if (error)
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return error;
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args->rmtblkno = lblkno = (xfs_dablk_t)lfileoff;
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args->rmtblkcnt = blkcnt;
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/*
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* Roll through the "value", allocating blocks on disk as required.
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*/
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while (blkcnt > 0) {
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int committed;
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/*
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* Allocate a single extent, up to the size of the value.
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*/
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xfs_bmap_init(args->flist, args->firstblock);
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nmap = 1;
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error = xfs_bmapi_write(args->trans, dp, (xfs_fileoff_t)lblkno,
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blkcnt,
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XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA,
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args->firstblock, args->total, &map, &nmap,
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args->flist);
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if (!error) {
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error = xfs_bmap_finish(&args->trans, args->flist,
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&committed);
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}
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if (error) {
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ASSERT(committed);
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args->trans = NULL;
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xfs_bmap_cancel(args->flist);
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return(error);
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}
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/*
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* bmap_finish() may have committed the last trans and started
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* a new one. We need the inode to be in all transactions.
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*/
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if (committed)
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xfs_trans_ijoin(args->trans, dp, 0);
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ASSERT(nmap == 1);
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ASSERT((map.br_startblock != DELAYSTARTBLOCK) &&
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(map.br_startblock != HOLESTARTBLOCK));
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lblkno += map.br_blockcount;
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blkcnt -= map.br_blockcount;
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/*
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* Start the next trans in the chain.
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*/
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error = xfs_trans_roll(&args->trans, dp);
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if (error)
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return (error);
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}
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/*
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* Roll through the "value", copying the attribute value to the
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* already-allocated blocks. Blocks are written synchronously
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* so that we can know they are all on disk before we turn off
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* the INCOMPLETE flag.
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*/
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lblkno = args->rmtblkno;
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blkcnt = args->rmtblkcnt;
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valuelen = args->valuelen;
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while (valuelen > 0) {
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struct xfs_buf *bp;
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xfs_daddr_t dblkno;
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int dblkcnt;
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ASSERT(blkcnt > 0);
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xfs_bmap_init(args->flist, args->firstblock);
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nmap = 1;
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error = xfs_bmapi_read(dp, (xfs_fileoff_t)lblkno,
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blkcnt, &map, &nmap,
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|
XFS_BMAPI_ATTRFORK);
|
|
if (error)
|
|
return(error);
|
|
ASSERT(nmap == 1);
|
|
ASSERT((map.br_startblock != DELAYSTARTBLOCK) &&
|
|
(map.br_startblock != HOLESTARTBLOCK));
|
|
|
|
dblkno = XFS_FSB_TO_DADDR(mp, map.br_startblock),
|
|
dblkcnt = XFS_FSB_TO_BB(mp, map.br_blockcount);
|
|
|
|
bp = xfs_buf_get(mp->m_ddev_targp, dblkno, dblkcnt, 0);
|
|
if (!bp)
|
|
return ENOMEM;
|
|
bp->b_ops = &xfs_attr3_rmt_buf_ops;
|
|
|
|
xfs_attr_rmtval_copyin(mp, bp, args->dp->i_ino, &offset,
|
|
&valuelen, &src);
|
|
|
|
error = xfs_bwrite(bp); /* GROT: NOTE: synchronous write */
|
|
xfs_buf_relse(bp);
|
|
if (error)
|
|
return error;
|
|
|
|
|
|
/* roll attribute extent map forwards */
|
|
lblkno += map.br_blockcount;
|
|
blkcnt -= map.br_blockcount;
|
|
}
|
|
ASSERT(valuelen == 0);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Remove the value associated with an attribute by deleting the
|
|
* out-of-line buffer that it is stored on.
|
|
*/
|
|
int
|
|
xfs_attr_rmtval_remove(
|
|
struct xfs_da_args *args)
|
|
{
|
|
struct xfs_mount *mp = args->dp->i_mount;
|
|
xfs_dablk_t lblkno;
|
|
int blkcnt;
|
|
int error;
|
|
int done;
|
|
|
|
trace_xfs_attr_rmtval_remove(args);
|
|
|
|
/*
|
|
* Roll through the "value", invalidating the attribute value's blocks.
|
|
*/
|
|
lblkno = args->rmtblkno;
|
|
blkcnt = args->rmtblkcnt;
|
|
while (blkcnt > 0) {
|
|
struct xfs_bmbt_irec map;
|
|
struct xfs_buf *bp;
|
|
xfs_daddr_t dblkno;
|
|
int dblkcnt;
|
|
int nmap;
|
|
|
|
/*
|
|
* Try to remember where we decided to put the value.
|
|
*/
|
|
nmap = 1;
|
|
error = xfs_bmapi_read(args->dp, (xfs_fileoff_t)lblkno,
|
|
blkcnt, &map, &nmap, XFS_BMAPI_ATTRFORK);
|
|
if (error)
|
|
return(error);
|
|
ASSERT(nmap == 1);
|
|
ASSERT((map.br_startblock != DELAYSTARTBLOCK) &&
|
|
(map.br_startblock != HOLESTARTBLOCK));
|
|
|
|
dblkno = XFS_FSB_TO_DADDR(mp, map.br_startblock),
|
|
dblkcnt = XFS_FSB_TO_BB(mp, map.br_blockcount);
|
|
|
|
/*
|
|
* If the "remote" value is in the cache, remove it.
|
|
*/
|
|
bp = xfs_incore(mp->m_ddev_targp, dblkno, dblkcnt, XBF_TRYLOCK);
|
|
if (bp) {
|
|
xfs_buf_stale(bp);
|
|
xfs_buf_relse(bp);
|
|
bp = NULL;
|
|
}
|
|
|
|
lblkno += map.br_blockcount;
|
|
blkcnt -= map.br_blockcount;
|
|
}
|
|
|
|
/*
|
|
* Keep de-allocating extents until the remote-value region is gone.
|
|
*/
|
|
lblkno = args->rmtblkno;
|
|
blkcnt = args->rmtblkcnt;
|
|
done = 0;
|
|
while (!done) {
|
|
int committed;
|
|
|
|
xfs_bmap_init(args->flist, args->firstblock);
|
|
error = xfs_bunmapi(args->trans, args->dp, lblkno, blkcnt,
|
|
XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA,
|
|
1, args->firstblock, args->flist,
|
|
&done);
|
|
if (!error) {
|
|
error = xfs_bmap_finish(&args->trans, args->flist,
|
|
&committed);
|
|
}
|
|
if (error) {
|
|
ASSERT(committed);
|
|
args->trans = NULL;
|
|
xfs_bmap_cancel(args->flist);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* bmap_finish() may have committed the last trans and started
|
|
* a new one. We need the inode to be in all transactions.
|
|
*/
|
|
if (committed)
|
|
xfs_trans_ijoin(args->trans, args->dp, 0);
|
|
|
|
/*
|
|
* Close out trans and start the next one in the chain.
|
|
*/
|
|
error = xfs_trans_roll(&args->trans, args->dp);
|
|
if (error)
|
|
return (error);
|
|
}
|
|
return(0);
|
|
}
|
|
|