533 lines
16 KiB
C
533 lines
16 KiB
C
/*
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* Copyright (c) 2000-2006 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_mount.h"
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#include "xfs_inode.h"
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#include "xfs_error.h"
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#include "xfs_cksum.h"
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#include "xfs_icache.h"
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#include "xfs_trans.h"
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#include "xfs_ialloc.h"
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/*
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* Check that none of the inode's in the buffer have a next
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* unlinked field of 0.
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*/
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#if defined(DEBUG)
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void
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xfs_inobp_check(
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xfs_mount_t *mp,
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xfs_buf_t *bp)
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{
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int i;
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int j;
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xfs_dinode_t *dip;
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j = mp->m_inode_cluster_size >> mp->m_sb.sb_inodelog;
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for (i = 0; i < j; i++) {
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dip = xfs_buf_offset(bp, i * mp->m_sb.sb_inodesize);
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if (!dip->di_next_unlinked) {
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xfs_alert(mp,
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"Detected bogus zero next_unlinked field in inode %d buffer 0x%llx.",
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i, (long long)bp->b_bn);
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}
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}
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}
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#endif
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/*
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* If we are doing readahead on an inode buffer, we might be in log recovery
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* reading an inode allocation buffer that hasn't yet been replayed, and hence
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* has not had the inode cores stamped into it. Hence for readahead, the buffer
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* may be potentially invalid.
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*
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* If the readahead buffer is invalid, we need to mark it with an error and
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* clear the DONE status of the buffer so that a followup read will re-read it
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* from disk. We don't report the error otherwise to avoid warnings during log
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* recovery and we don't get unnecssary panics on debug kernels. We use EIO here
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* because all we want to do is say readahead failed; there is no-one to report
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* the error to, so this will distinguish it from a non-ra verifier failure.
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* Changes to this readahead error behavour also need to be reflected in
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* xfs_dquot_buf_readahead_verify().
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*/
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static void
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xfs_inode_buf_verify(
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struct xfs_buf *bp,
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bool readahead)
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{
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struct xfs_mount *mp = bp->b_target->bt_mount;
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int i;
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int ni;
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/*
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* Validate the magic number and version of every inode in the buffer
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*/
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ni = XFS_BB_TO_FSB(mp, bp->b_length) * mp->m_sb.sb_inopblock;
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for (i = 0; i < ni; i++) {
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int di_ok;
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xfs_dinode_t *dip;
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dip = xfs_buf_offset(bp, (i << mp->m_sb.sb_inodelog));
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di_ok = dip->di_magic == cpu_to_be16(XFS_DINODE_MAGIC) &&
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XFS_DINODE_GOOD_VERSION(dip->di_version);
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if (unlikely(XFS_TEST_ERROR(!di_ok, mp,
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XFS_ERRTAG_ITOBP_INOTOBP,
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XFS_RANDOM_ITOBP_INOTOBP))) {
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if (readahead) {
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bp->b_flags &= ~XBF_DONE;
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xfs_buf_ioerror(bp, -EIO);
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return;
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}
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xfs_buf_ioerror(bp, -EFSCORRUPTED);
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xfs_verifier_error(bp);
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#ifdef DEBUG
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xfs_alert(mp,
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"bad inode magic/vsn daddr %lld #%d (magic=%x)",
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(unsigned long long)bp->b_bn, i,
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be16_to_cpu(dip->di_magic));
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#endif
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}
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}
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xfs_inobp_check(mp, bp);
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}
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static void
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xfs_inode_buf_read_verify(
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struct xfs_buf *bp)
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{
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xfs_inode_buf_verify(bp, false);
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}
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static void
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xfs_inode_buf_readahead_verify(
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struct xfs_buf *bp)
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{
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xfs_inode_buf_verify(bp, true);
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}
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static void
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xfs_inode_buf_write_verify(
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struct xfs_buf *bp)
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{
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xfs_inode_buf_verify(bp, false);
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}
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const struct xfs_buf_ops xfs_inode_buf_ops = {
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.name = "xfs_inode",
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.verify_read = xfs_inode_buf_read_verify,
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.verify_write = xfs_inode_buf_write_verify,
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};
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const struct xfs_buf_ops xfs_inode_buf_ra_ops = {
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.name = "xxfs_inode_ra",
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.verify_read = xfs_inode_buf_readahead_verify,
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.verify_write = xfs_inode_buf_write_verify,
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};
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/*
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* This routine is called to map an inode to the buffer containing the on-disk
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* version of the inode. It returns a pointer to the buffer containing the
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* on-disk inode in the bpp parameter, and in the dipp parameter it returns a
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* pointer to the on-disk inode within that buffer.
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*
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* If a non-zero error is returned, then the contents of bpp and dipp are
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* undefined.
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*/
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int
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xfs_imap_to_bp(
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struct xfs_mount *mp,
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struct xfs_trans *tp,
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struct xfs_imap *imap,
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struct xfs_dinode **dipp,
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struct xfs_buf **bpp,
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uint buf_flags,
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uint iget_flags)
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{
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struct xfs_buf *bp;
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int error;
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buf_flags |= XBF_UNMAPPED;
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error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp, imap->im_blkno,
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(int)imap->im_len, buf_flags, &bp,
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&xfs_inode_buf_ops);
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if (error) {
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if (error == -EAGAIN) {
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ASSERT(buf_flags & XBF_TRYLOCK);
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return error;
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}
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if (error == -EFSCORRUPTED &&
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(iget_flags & XFS_IGET_UNTRUSTED))
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return -EINVAL;
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xfs_warn(mp, "%s: xfs_trans_read_buf() returned error %d.",
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__func__, error);
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return error;
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}
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*bpp = bp;
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*dipp = xfs_buf_offset(bp, imap->im_boffset);
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return 0;
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}
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void
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xfs_inode_from_disk(
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struct xfs_inode *ip,
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struct xfs_dinode *from)
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{
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struct xfs_icdinode *to = &ip->i_d;
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struct inode *inode = VFS_I(ip);
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/*
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* Convert v1 inodes immediately to v2 inode format as this is the
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* minimum inode version format we support in the rest of the code.
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*/
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to->di_version = from->di_version;
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if (to->di_version == 1) {
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set_nlink(inode, be16_to_cpu(from->di_onlink));
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to->di_projid_lo = 0;
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to->di_projid_hi = 0;
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to->di_version = 2;
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} else {
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set_nlink(inode, be32_to_cpu(from->di_nlink));
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to->di_projid_lo = be16_to_cpu(from->di_projid_lo);
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to->di_projid_hi = be16_to_cpu(from->di_projid_hi);
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}
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to->di_format = from->di_format;
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to->di_uid = be32_to_cpu(from->di_uid);
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to->di_gid = be32_to_cpu(from->di_gid);
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to->di_flushiter = be16_to_cpu(from->di_flushiter);
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/*
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* Time is signed, so need to convert to signed 32 bit before
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* storing in inode timestamp which may be 64 bit. Otherwise
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* a time before epoch is converted to a time long after epoch
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* on 64 bit systems.
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*/
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inode->i_atime.tv_sec = (int)be32_to_cpu(from->di_atime.t_sec);
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inode->i_atime.tv_nsec = (int)be32_to_cpu(from->di_atime.t_nsec);
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inode->i_mtime.tv_sec = (int)be32_to_cpu(from->di_mtime.t_sec);
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inode->i_mtime.tv_nsec = (int)be32_to_cpu(from->di_mtime.t_nsec);
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inode->i_ctime.tv_sec = (int)be32_to_cpu(from->di_ctime.t_sec);
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inode->i_ctime.tv_nsec = (int)be32_to_cpu(from->di_ctime.t_nsec);
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inode->i_generation = be32_to_cpu(from->di_gen);
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inode->i_mode = be16_to_cpu(from->di_mode);
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to->di_size = be64_to_cpu(from->di_size);
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to->di_nblocks = be64_to_cpu(from->di_nblocks);
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to->di_extsize = be32_to_cpu(from->di_extsize);
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to->di_nextents = be32_to_cpu(from->di_nextents);
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to->di_anextents = be16_to_cpu(from->di_anextents);
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to->di_forkoff = from->di_forkoff;
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to->di_aformat = from->di_aformat;
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to->di_dmevmask = be32_to_cpu(from->di_dmevmask);
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to->di_dmstate = be16_to_cpu(from->di_dmstate);
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to->di_flags = be16_to_cpu(from->di_flags);
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if (to->di_version == 3) {
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inode->i_version = be64_to_cpu(from->di_changecount);
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to->di_crtime.t_sec = be32_to_cpu(from->di_crtime.t_sec);
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to->di_crtime.t_nsec = be32_to_cpu(from->di_crtime.t_nsec);
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to->di_flags2 = be64_to_cpu(from->di_flags2);
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}
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}
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void
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xfs_inode_to_disk(
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struct xfs_inode *ip,
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struct xfs_dinode *to,
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xfs_lsn_t lsn)
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{
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struct xfs_icdinode *from = &ip->i_d;
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struct inode *inode = VFS_I(ip);
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to->di_magic = cpu_to_be16(XFS_DINODE_MAGIC);
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to->di_onlink = 0;
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to->di_version = from->di_version;
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to->di_format = from->di_format;
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to->di_uid = cpu_to_be32(from->di_uid);
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to->di_gid = cpu_to_be32(from->di_gid);
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to->di_projid_lo = cpu_to_be16(from->di_projid_lo);
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to->di_projid_hi = cpu_to_be16(from->di_projid_hi);
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memset(to->di_pad, 0, sizeof(to->di_pad));
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to->di_atime.t_sec = cpu_to_be32(inode->i_atime.tv_sec);
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to->di_atime.t_nsec = cpu_to_be32(inode->i_atime.tv_nsec);
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to->di_mtime.t_sec = cpu_to_be32(inode->i_mtime.tv_sec);
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to->di_mtime.t_nsec = cpu_to_be32(inode->i_mtime.tv_nsec);
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to->di_ctime.t_sec = cpu_to_be32(inode->i_ctime.tv_sec);
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to->di_ctime.t_nsec = cpu_to_be32(inode->i_ctime.tv_nsec);
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to->di_nlink = cpu_to_be32(inode->i_nlink);
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to->di_gen = cpu_to_be32(inode->i_generation);
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to->di_mode = cpu_to_be16(inode->i_mode);
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to->di_size = cpu_to_be64(from->di_size);
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to->di_nblocks = cpu_to_be64(from->di_nblocks);
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to->di_extsize = cpu_to_be32(from->di_extsize);
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to->di_nextents = cpu_to_be32(from->di_nextents);
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to->di_anextents = cpu_to_be16(from->di_anextents);
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to->di_forkoff = from->di_forkoff;
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to->di_aformat = from->di_aformat;
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to->di_dmevmask = cpu_to_be32(from->di_dmevmask);
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to->di_dmstate = cpu_to_be16(from->di_dmstate);
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to->di_flags = cpu_to_be16(from->di_flags);
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if (from->di_version == 3) {
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to->di_changecount = cpu_to_be64(inode->i_version);
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to->di_crtime.t_sec = cpu_to_be32(from->di_crtime.t_sec);
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to->di_crtime.t_nsec = cpu_to_be32(from->di_crtime.t_nsec);
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to->di_flags2 = cpu_to_be64(from->di_flags2);
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to->di_ino = cpu_to_be64(ip->i_ino);
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to->di_lsn = cpu_to_be64(lsn);
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memset(to->di_pad2, 0, sizeof(to->di_pad2));
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uuid_copy(&to->di_uuid, &ip->i_mount->m_sb.sb_meta_uuid);
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to->di_flushiter = 0;
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} else {
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to->di_flushiter = cpu_to_be16(from->di_flushiter);
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}
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}
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void
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xfs_log_dinode_to_disk(
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struct xfs_log_dinode *from,
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struct xfs_dinode *to)
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{
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to->di_magic = cpu_to_be16(from->di_magic);
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to->di_mode = cpu_to_be16(from->di_mode);
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to->di_version = from->di_version;
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to->di_format = from->di_format;
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to->di_onlink = 0;
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to->di_uid = cpu_to_be32(from->di_uid);
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to->di_gid = cpu_to_be32(from->di_gid);
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to->di_nlink = cpu_to_be32(from->di_nlink);
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to->di_projid_lo = cpu_to_be16(from->di_projid_lo);
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to->di_projid_hi = cpu_to_be16(from->di_projid_hi);
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memcpy(to->di_pad, from->di_pad, sizeof(to->di_pad));
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to->di_atime.t_sec = cpu_to_be32(from->di_atime.t_sec);
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to->di_atime.t_nsec = cpu_to_be32(from->di_atime.t_nsec);
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to->di_mtime.t_sec = cpu_to_be32(from->di_mtime.t_sec);
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to->di_mtime.t_nsec = cpu_to_be32(from->di_mtime.t_nsec);
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to->di_ctime.t_sec = cpu_to_be32(from->di_ctime.t_sec);
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to->di_ctime.t_nsec = cpu_to_be32(from->di_ctime.t_nsec);
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to->di_size = cpu_to_be64(from->di_size);
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to->di_nblocks = cpu_to_be64(from->di_nblocks);
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to->di_extsize = cpu_to_be32(from->di_extsize);
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to->di_nextents = cpu_to_be32(from->di_nextents);
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to->di_anextents = cpu_to_be16(from->di_anextents);
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to->di_forkoff = from->di_forkoff;
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to->di_aformat = from->di_aformat;
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to->di_dmevmask = cpu_to_be32(from->di_dmevmask);
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to->di_dmstate = cpu_to_be16(from->di_dmstate);
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to->di_flags = cpu_to_be16(from->di_flags);
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to->di_gen = cpu_to_be32(from->di_gen);
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if (from->di_version == 3) {
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to->di_changecount = cpu_to_be64(from->di_changecount);
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to->di_crtime.t_sec = cpu_to_be32(from->di_crtime.t_sec);
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to->di_crtime.t_nsec = cpu_to_be32(from->di_crtime.t_nsec);
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to->di_flags2 = cpu_to_be64(from->di_flags2);
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to->di_ino = cpu_to_be64(from->di_ino);
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to->di_lsn = cpu_to_be64(from->di_lsn);
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memcpy(to->di_pad2, from->di_pad2, sizeof(to->di_pad2));
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uuid_copy(&to->di_uuid, &from->di_uuid);
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to->di_flushiter = 0;
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} else {
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to->di_flushiter = cpu_to_be16(from->di_flushiter);
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}
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}
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static bool
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xfs_dinode_verify(
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struct xfs_mount *mp,
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struct xfs_inode *ip,
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struct xfs_dinode *dip)
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{
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if (dip->di_magic != cpu_to_be16(XFS_DINODE_MAGIC))
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return false;
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/* only version 3 or greater inodes are extensively verified here */
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if (dip->di_version < 3)
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return true;
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if (!xfs_sb_version_hascrc(&mp->m_sb))
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return false;
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if (!xfs_verify_cksum((char *)dip, mp->m_sb.sb_inodesize,
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XFS_DINODE_CRC_OFF))
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return false;
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if (be64_to_cpu(dip->di_ino) != ip->i_ino)
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return false;
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if (!uuid_equal(&dip->di_uuid, &mp->m_sb.sb_meta_uuid))
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return false;
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return true;
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}
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void
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xfs_dinode_calc_crc(
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struct xfs_mount *mp,
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struct xfs_dinode *dip)
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{
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__uint32_t crc;
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if (dip->di_version < 3)
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return;
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ASSERT(xfs_sb_version_hascrc(&mp->m_sb));
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crc = xfs_start_cksum((char *)dip, mp->m_sb.sb_inodesize,
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XFS_DINODE_CRC_OFF);
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dip->di_crc = xfs_end_cksum(crc);
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}
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/*
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* Read the disk inode attributes into the in-core inode structure.
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*
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* For version 5 superblocks, if we are initialising a new inode and we are not
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* utilising the XFS_MOUNT_IKEEP inode cluster mode, we can simple build the new
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* inode core with a random generation number. If we are keeping inodes around,
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* we need to read the inode cluster to get the existing generation number off
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* disk. Further, if we are using version 4 superblocks (i.e. v1/v2 inode
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* format) then log recovery is dependent on the di_flushiter field being
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* initialised from the current on-disk value and hence we must also read the
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* inode off disk.
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*/
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int
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xfs_iread(
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xfs_mount_t *mp,
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xfs_trans_t *tp,
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|
xfs_inode_t *ip,
|
|
uint iget_flags)
|
|
{
|
|
xfs_buf_t *bp;
|
|
xfs_dinode_t *dip;
|
|
int error;
|
|
|
|
/*
|
|
* Fill in the location information in the in-core inode.
|
|
*/
|
|
error = xfs_imap(mp, tp, ip->i_ino, &ip->i_imap, iget_flags);
|
|
if (error)
|
|
return error;
|
|
|
|
/* shortcut IO on inode allocation if possible */
|
|
if ((iget_flags & XFS_IGET_CREATE) &&
|
|
xfs_sb_version_hascrc(&mp->m_sb) &&
|
|
!(mp->m_flags & XFS_MOUNT_IKEEP)) {
|
|
/* initialise the on-disk inode core */
|
|
memset(&ip->i_d, 0, sizeof(ip->i_d));
|
|
VFS_I(ip)->i_generation = prandom_u32();
|
|
if (xfs_sb_version_hascrc(&mp->m_sb))
|
|
ip->i_d.di_version = 3;
|
|
else
|
|
ip->i_d.di_version = 2;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Get pointers to the on-disk inode and the buffer containing it.
|
|
*/
|
|
error = xfs_imap_to_bp(mp, tp, &ip->i_imap, &dip, &bp, 0, iget_flags);
|
|
if (error)
|
|
return error;
|
|
|
|
/* even unallocated inodes are verified */
|
|
if (!xfs_dinode_verify(mp, ip, dip)) {
|
|
xfs_alert(mp, "%s: validation failed for inode %lld failed",
|
|
__func__, ip->i_ino);
|
|
|
|
XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp, dip);
|
|
error = -EFSCORRUPTED;
|
|
goto out_brelse;
|
|
}
|
|
|
|
/*
|
|
* If the on-disk inode is already linked to a directory
|
|
* entry, copy all of the inode into the in-core inode.
|
|
* xfs_iformat_fork() handles copying in the inode format
|
|
* specific information.
|
|
* Otherwise, just get the truly permanent information.
|
|
*/
|
|
if (dip->di_mode) {
|
|
xfs_inode_from_disk(ip, dip);
|
|
error = xfs_iformat_fork(ip, dip);
|
|
if (error) {
|
|
#ifdef DEBUG
|
|
xfs_alert(mp, "%s: xfs_iformat() returned error %d",
|
|
__func__, error);
|
|
#endif /* DEBUG */
|
|
goto out_brelse;
|
|
}
|
|
} else {
|
|
/*
|
|
* Partial initialisation of the in-core inode. Just the bits
|
|
* that xfs_ialloc won't overwrite or relies on being correct.
|
|
*/
|
|
ip->i_d.di_version = dip->di_version;
|
|
VFS_I(ip)->i_generation = be32_to_cpu(dip->di_gen);
|
|
ip->i_d.di_flushiter = be16_to_cpu(dip->di_flushiter);
|
|
|
|
/*
|
|
* Make sure to pull in the mode here as well in
|
|
* case the inode is released without being used.
|
|
* This ensures that xfs_inactive() will see that
|
|
* the inode is already free and not try to mess
|
|
* with the uninitialized part of it.
|
|
*/
|
|
VFS_I(ip)->i_mode = 0;
|
|
}
|
|
|
|
ASSERT(ip->i_d.di_version >= 2);
|
|
ip->i_delayed_blks = 0;
|
|
|
|
/*
|
|
* Mark the buffer containing the inode as something to keep
|
|
* around for a while. This helps to keep recently accessed
|
|
* meta-data in-core longer.
|
|
*/
|
|
xfs_buf_set_ref(bp, XFS_INO_REF);
|
|
|
|
/*
|
|
* Use xfs_trans_brelse() to release the buffer containing the on-disk
|
|
* inode, because it was acquired with xfs_trans_read_buf() in
|
|
* xfs_imap_to_bp() above. If tp is NULL, this is just a normal
|
|
* brelse(). If we're within a transaction, then xfs_trans_brelse()
|
|
* will only release the buffer if it is not dirty within the
|
|
* transaction. It will be OK to release the buffer in this case,
|
|
* because inodes on disk are never destroyed and we will be locking the
|
|
* new in-core inode before putting it in the cache where other
|
|
* processes can find it. Thus we don't have to worry about the inode
|
|
* being changed just because we released the buffer.
|
|
*/
|
|
out_brelse:
|
|
xfs_trans_brelse(tp, bp);
|
|
return error;
|
|
}
|