forked from Minki/linux
339e1a3fcd
Verify the inode di_forkoff, lifted from xfs_repair's process_check_inode_forkoff(). Signed-off-by: Eric Sandeen <sandeen@redhat.com> Reviewed-by: Brian Foster <bfoster@redhat.com> Signed-off-by: Dave Chinner <david@fromorbit.com>
829 lines
23 KiB
C
829 lines
23 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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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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#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_defer.h"
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#include "xfs_inode.h"
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#include "xfs_errortag.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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#include "xfs_dir2.h"
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#include <linux/iversion.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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bool
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xfs_dinode_good_version(
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struct xfs_mount *mp,
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__u8 version)
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{
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if (xfs_sb_version_hascrc(&mp->m_sb))
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return version == 3;
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return version == 1 || version == 2;
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}
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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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xfs_agnumber_t agno;
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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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agno = xfs_daddr_to_agno(mp, XFS_BUF_ADDR(bp));
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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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xfs_agino_t unlinked_ino;
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dip = xfs_buf_offset(bp, (i << mp->m_sb.sb_inodelog));
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unlinked_ino = be32_to_cpu(dip->di_next_unlinked);
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di_ok = dip->di_magic == cpu_to_be16(XFS_DINODE_MAGIC) &&
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xfs_dinode_good_version(mp, dip->di_version) &&
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(unlinked_ino == NULLAGINO ||
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xfs_verify_agino(mp, agno, unlinked_ino));
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if (unlikely(XFS_TEST_ERROR(!di_ok, mp,
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XFS_ERRTAG_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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#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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xfs_buf_verifier_error(bp, -EFSCORRUPTED,
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__func__, dip, sizeof(*dip),
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NULL);
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return;
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}
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}
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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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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_set_iversion_queried(inode,
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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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to->di_cowextsize = be32_to_cpu(from->di_cowextsize);
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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_peek_iversion(inode));
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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_cowextsize = cpu_to_be32(from->di_cowextsize);
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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_cowextsize = cpu_to_be32(from->di_cowextsize);
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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 xfs_failaddr_t
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xfs_dinode_verify_fork(
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struct xfs_dinode *dip,
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struct xfs_mount *mp,
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int whichfork)
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{
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uint32_t di_nextents = XFS_DFORK_NEXTENTS(dip, whichfork);
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switch (XFS_DFORK_FORMAT(dip, whichfork)) {
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case XFS_DINODE_FMT_LOCAL:
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/*
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* no local regular files yet
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*/
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if (whichfork == XFS_DATA_FORK) {
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if (S_ISREG(be16_to_cpu(dip->di_mode)))
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return __this_address;
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if (be64_to_cpu(dip->di_size) >
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XFS_DFORK_SIZE(dip, mp, whichfork))
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return __this_address;
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}
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if (di_nextents)
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return __this_address;
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break;
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case XFS_DINODE_FMT_EXTENTS:
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if (di_nextents > XFS_DFORK_MAXEXT(dip, mp, whichfork))
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return __this_address;
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break;
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case XFS_DINODE_FMT_BTREE:
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if (whichfork == XFS_ATTR_FORK) {
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if (di_nextents > MAXAEXTNUM)
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return __this_address;
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} else if (di_nextents > MAXEXTNUM) {
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return __this_address;
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}
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break;
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default:
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return __this_address;
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}
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return NULL;
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}
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static xfs_failaddr_t
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|
xfs_dinode_verify_forkoff(
|
|
struct xfs_dinode *dip,
|
|
struct xfs_mount *mp)
|
|
{
|
|
if (!XFS_DFORK_Q(dip))
|
|
return NULL;
|
|
|
|
switch (dip->di_format) {
|
|
case XFS_DINODE_FMT_DEV:
|
|
if (dip->di_forkoff != (roundup(sizeof(xfs_dev_t), 8) >> 3))
|
|
return __this_address;
|
|
break;
|
|
case XFS_DINODE_FMT_LOCAL: /* fall through ... */
|
|
case XFS_DINODE_FMT_EXTENTS: /* fall through ... */
|
|
case XFS_DINODE_FMT_BTREE:
|
|
if (dip->di_forkoff >= (XFS_LITINO(mp, dip->di_version) >> 3))
|
|
return __this_address;
|
|
break;
|
|
default:
|
|
return __this_address;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
xfs_failaddr_t
|
|
xfs_dinode_verify(
|
|
struct xfs_mount *mp,
|
|
xfs_ino_t ino,
|
|
struct xfs_dinode *dip)
|
|
{
|
|
xfs_failaddr_t fa;
|
|
uint16_t mode;
|
|
uint16_t flags;
|
|
uint64_t flags2;
|
|
uint64_t di_size;
|
|
|
|
if (dip->di_magic != cpu_to_be16(XFS_DINODE_MAGIC))
|
|
return __this_address;
|
|
|
|
/* Verify v3 integrity information first */
|
|
if (dip->di_version >= 3) {
|
|
if (!xfs_sb_version_hascrc(&mp->m_sb))
|
|
return __this_address;
|
|
if (!xfs_verify_cksum((char *)dip, mp->m_sb.sb_inodesize,
|
|
XFS_DINODE_CRC_OFF))
|
|
return __this_address;
|
|
if (be64_to_cpu(dip->di_ino) != ino)
|
|
return __this_address;
|
|
if (!uuid_equal(&dip->di_uuid, &mp->m_sb.sb_meta_uuid))
|
|
return __this_address;
|
|
}
|
|
|
|
/* don't allow invalid i_size */
|
|
di_size = be64_to_cpu(dip->di_size);
|
|
if (di_size & (1ULL << 63))
|
|
return __this_address;
|
|
|
|
mode = be16_to_cpu(dip->di_mode);
|
|
if (mode && xfs_mode_to_ftype(mode) == XFS_DIR3_FT_UNKNOWN)
|
|
return __this_address;
|
|
|
|
/* No zero-length symlinks/dirs. */
|
|
if ((S_ISLNK(mode) || S_ISDIR(mode)) && di_size == 0)
|
|
return __this_address;
|
|
|
|
/* Fork checks carried over from xfs_iformat_fork */
|
|
if (mode &&
|
|
be32_to_cpu(dip->di_nextents) + be16_to_cpu(dip->di_anextents) >
|
|
be64_to_cpu(dip->di_nblocks))
|
|
return __this_address;
|
|
|
|
if (mode && XFS_DFORK_BOFF(dip) > mp->m_sb.sb_inodesize)
|
|
return __this_address;
|
|
|
|
flags = be16_to_cpu(dip->di_flags);
|
|
|
|
if (mode && (flags & XFS_DIFLAG_REALTIME) && !mp->m_rtdev_targp)
|
|
return __this_address;
|
|
|
|
/* check for illegal values of forkoff */
|
|
fa = xfs_dinode_verify_forkoff(dip, mp);
|
|
if (fa)
|
|
return fa;
|
|
|
|
/* Do we have appropriate data fork formats for the mode? */
|
|
switch (mode & S_IFMT) {
|
|
case S_IFIFO:
|
|
case S_IFCHR:
|
|
case S_IFBLK:
|
|
case S_IFSOCK:
|
|
if (dip->di_format != XFS_DINODE_FMT_DEV)
|
|
return __this_address;
|
|
break;
|
|
case S_IFREG:
|
|
case S_IFLNK:
|
|
case S_IFDIR:
|
|
fa = xfs_dinode_verify_fork(dip, mp, XFS_DATA_FORK);
|
|
if (fa)
|
|
return fa;
|
|
break;
|
|
case 0:
|
|
/* Uninitialized inode ok. */
|
|
break;
|
|
default:
|
|
return __this_address;
|
|
}
|
|
|
|
if (XFS_DFORK_Q(dip)) {
|
|
fa = xfs_dinode_verify_fork(dip, mp, XFS_ATTR_FORK);
|
|
if (fa)
|
|
return fa;
|
|
} else {
|
|
/*
|
|
* If there is no fork offset, this may be a freshly-made inode
|
|
* in a new disk cluster, in which case di_aformat is zeroed.
|
|
* Otherwise, such an inode must be in EXTENTS format; this goes
|
|
* for freed inodes as well.
|
|
*/
|
|
switch (dip->di_aformat) {
|
|
case 0:
|
|
case XFS_DINODE_FMT_EXTENTS:
|
|
break;
|
|
default:
|
|
return __this_address;
|
|
}
|
|
if (dip->di_anextents)
|
|
return __this_address;
|
|
}
|
|
|
|
/* extent size hint validation */
|
|
fa = xfs_inode_validate_extsize(mp, be32_to_cpu(dip->di_extsize),
|
|
mode, flags);
|
|
if (fa)
|
|
return fa;
|
|
|
|
/* only version 3 or greater inodes are extensively verified here */
|
|
if (dip->di_version < 3)
|
|
return NULL;
|
|
|
|
flags2 = be64_to_cpu(dip->di_flags2);
|
|
|
|
/* don't allow reflink/cowextsize if we don't have reflink */
|
|
if ((flags2 & (XFS_DIFLAG2_REFLINK | XFS_DIFLAG2_COWEXTSIZE)) &&
|
|
!xfs_sb_version_hasreflink(&mp->m_sb))
|
|
return __this_address;
|
|
|
|
/* only regular files get reflink */
|
|
if ((flags2 & XFS_DIFLAG2_REFLINK) && (mode & S_IFMT) != S_IFREG)
|
|
return __this_address;
|
|
|
|
/* don't let reflink and realtime mix */
|
|
if ((flags2 & XFS_DIFLAG2_REFLINK) && (flags & XFS_DIFLAG_REALTIME))
|
|
return __this_address;
|
|
|
|
/* don't let reflink and dax mix */
|
|
if ((flags2 & XFS_DIFLAG2_REFLINK) && (flags2 & XFS_DIFLAG2_DAX))
|
|
return __this_address;
|
|
|
|
/* COW extent size hint validation */
|
|
fa = xfs_inode_validate_cowextsize(mp, be32_to_cpu(dip->di_cowextsize),
|
|
mode, flags, flags2);
|
|
if (fa)
|
|
return fa;
|
|
|
|
return NULL;
|
|
}
|
|
|
|
void
|
|
xfs_dinode_calc_crc(
|
|
struct xfs_mount *mp,
|
|
struct xfs_dinode *dip)
|
|
{
|
|
uint32_t crc;
|
|
|
|
if (dip->di_version < 3)
|
|
return;
|
|
|
|
ASSERT(xfs_sb_version_hascrc(&mp->m_sb));
|
|
crc = xfs_start_cksum_update((char *)dip, mp->m_sb.sb_inodesize,
|
|
XFS_DINODE_CRC_OFF);
|
|
dip->di_crc = xfs_end_cksum(crc);
|
|
}
|
|
|
|
/*
|
|
* Read the disk inode attributes into the in-core inode structure.
|
|
*
|
|
* For version 5 superblocks, if we are initialising a new inode and we are not
|
|
* utilising the XFS_MOUNT_IKEEP inode cluster mode, we can simple build the new
|
|
* inode core with a random generation number. If we are keeping inodes around,
|
|
* we need to read the inode cluster to get the existing generation number off
|
|
* disk. Further, if we are using version 4 superblocks (i.e. v1/v2 inode
|
|
* format) then log recovery is dependent on the di_flushiter field being
|
|
* initialised from the current on-disk value and hence we must also read the
|
|
* inode off disk.
|
|
*/
|
|
int
|
|
xfs_iread(
|
|
xfs_mount_t *mp,
|
|
xfs_trans_t *tp,
|
|
xfs_inode_t *ip,
|
|
uint iget_flags)
|
|
{
|
|
xfs_buf_t *bp;
|
|
xfs_dinode_t *dip;
|
|
xfs_failaddr_t fa;
|
|
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();
|
|
ip->i_d.di_version = 3;
|
|
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 */
|
|
fa = xfs_dinode_verify(mp, ip->i_ino, dip);
|
|
if (fa) {
|
|
xfs_inode_verifier_error(ip, -EFSCORRUPTED, "dinode", dip,
|
|
sizeof(*dip), fa);
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* Validate di_extsize hint.
|
|
*
|
|
* The rules are documented at xfs_ioctl_setattr_check_extsize().
|
|
* These functions must be kept in sync with each other.
|
|
*/
|
|
xfs_failaddr_t
|
|
xfs_inode_validate_extsize(
|
|
struct xfs_mount *mp,
|
|
uint32_t extsize,
|
|
uint16_t mode,
|
|
uint16_t flags)
|
|
{
|
|
bool rt_flag;
|
|
bool hint_flag;
|
|
bool inherit_flag;
|
|
uint32_t extsize_bytes;
|
|
uint32_t blocksize_bytes;
|
|
|
|
rt_flag = (flags & XFS_DIFLAG_REALTIME);
|
|
hint_flag = (flags & XFS_DIFLAG_EXTSIZE);
|
|
inherit_flag = (flags & XFS_DIFLAG_EXTSZINHERIT);
|
|
extsize_bytes = XFS_FSB_TO_B(mp, extsize);
|
|
|
|
if (rt_flag)
|
|
blocksize_bytes = mp->m_sb.sb_rextsize << mp->m_sb.sb_blocklog;
|
|
else
|
|
blocksize_bytes = mp->m_sb.sb_blocksize;
|
|
|
|
if ((hint_flag || inherit_flag) && !(S_ISDIR(mode) || S_ISREG(mode)))
|
|
return __this_address;
|
|
|
|
if (hint_flag && !S_ISREG(mode))
|
|
return __this_address;
|
|
|
|
if (inherit_flag && !S_ISDIR(mode))
|
|
return __this_address;
|
|
|
|
if ((hint_flag || inherit_flag) && extsize == 0)
|
|
return __this_address;
|
|
|
|
/* free inodes get flags set to zero but extsize remains */
|
|
if (mode && !(hint_flag || inherit_flag) && extsize != 0)
|
|
return __this_address;
|
|
|
|
if (extsize_bytes % blocksize_bytes)
|
|
return __this_address;
|
|
|
|
if (extsize > MAXEXTLEN)
|
|
return __this_address;
|
|
|
|
if (!rt_flag && extsize > mp->m_sb.sb_agblocks / 2)
|
|
return __this_address;
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* Validate di_cowextsize hint.
|
|
*
|
|
* The rules are documented at xfs_ioctl_setattr_check_cowextsize().
|
|
* These functions must be kept in sync with each other.
|
|
*/
|
|
xfs_failaddr_t
|
|
xfs_inode_validate_cowextsize(
|
|
struct xfs_mount *mp,
|
|
uint32_t cowextsize,
|
|
uint16_t mode,
|
|
uint16_t flags,
|
|
uint64_t flags2)
|
|
{
|
|
bool rt_flag;
|
|
bool hint_flag;
|
|
uint32_t cowextsize_bytes;
|
|
|
|
rt_flag = (flags & XFS_DIFLAG_REALTIME);
|
|
hint_flag = (flags2 & XFS_DIFLAG2_COWEXTSIZE);
|
|
cowextsize_bytes = XFS_FSB_TO_B(mp, cowextsize);
|
|
|
|
if (hint_flag && !xfs_sb_version_hasreflink(&mp->m_sb))
|
|
return __this_address;
|
|
|
|
if (hint_flag && !(S_ISDIR(mode) || S_ISREG(mode)))
|
|
return __this_address;
|
|
|
|
if (hint_flag && cowextsize == 0)
|
|
return __this_address;
|
|
|
|
/* free inodes get flags set to zero but cowextsize remains */
|
|
if (mode && !hint_flag && cowextsize != 0)
|
|
return __this_address;
|
|
|
|
if (hint_flag && rt_flag)
|
|
return __this_address;
|
|
|
|
if (cowextsize_bytes % mp->m_sb.sb_blocksize)
|
|
return __this_address;
|
|
|
|
if (cowextsize > MAXEXTLEN)
|
|
return __this_address;
|
|
|
|
if (cowextsize > mp->m_sb.sb_agblocks / 2)
|
|
return __this_address;
|
|
|
|
return NULL;
|
|
}
|