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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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|
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#define ATTR_RMTVALUE_MAPSIZE 1 /* # of map entries at once */ |
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|
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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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/* |
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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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|
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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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|
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/* ok */ |
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return true; |
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} |
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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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|
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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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|
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return true; |
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} |
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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return sizeof(struct xfs_attr3_rmt_hdr); |
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} |
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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/* |
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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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|
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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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|
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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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/* |
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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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|
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trace_xfs_attr_rmtval_get(args); |
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|
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ASSERT(!(args->flags & ATTR_KERNOVAL)); |
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|
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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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|
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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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|
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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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|
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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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|
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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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/* |
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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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|
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trace_xfs_attr_rmtval_set(args); |
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|
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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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/* |
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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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/* |
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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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/* |
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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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|
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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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/* |
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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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/* |
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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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|
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ASSERT(blkcnt > 0); |
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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_read(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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ASSERT((map.br_startblock != DELAYSTARTBLOCK) && |
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(map.br_startblock != HOLESTARTBLOCK)); |
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|
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dblkno = XFS_FSB_TO_DADDR(mp, map.br_startblock), |
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dblkcnt = XFS_FSB_TO_BB(mp, map.br_blockcount); |
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|
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bp = xfs_buf_get(mp->m_ddev_targp, dblkno, dblkcnt, 0); |
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if (!bp) |
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return ENOMEM; |
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bp->b_ops = &xfs_attr3_rmt_buf_ops; |
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|
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xfs_attr_rmtval_copyin(mp, bp, args->dp->i_ino, &offset, |
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&valuelen, &src); |
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|
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error = xfs_bwrite(bp); /* GROT: NOTE: synchronous write */ |
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xfs_buf_relse(bp); |
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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 attribute extent map forwards */ |
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lblkno += map.br_blockcount; |
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blkcnt -= map.br_blockcount; |
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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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* Remove the value associated with an attribute by deleting the |
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* out-of-line buffer that it is stored on. |
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*/ |
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int |
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xfs_attr_rmtval_remove( |
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struct xfs_da_args *args) |
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{ |
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struct xfs_mount *mp = args->dp->i_mount; |
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xfs_dablk_t lblkno; |
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int blkcnt; |
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int error; |
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int done; |
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|
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trace_xfs_attr_rmtval_remove(args); |
|
|
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/* |
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* Roll through the "value", invalidating the attribute value's blocks. |
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*/ |
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lblkno = args->rmtblkno; |
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blkcnt = args->rmtblkcnt; |
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while (blkcnt > 0) { |
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struct xfs_bmbt_irec map; |
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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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int nmap; |
|
|
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/* |
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* Try to remember where we decided to put the value. |
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*/ |
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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); |
|
}
|
|
|