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6d200bdc01
This series fixes a use-after-free bug that syzbot uncovered. The UAF itself is a result of a race condition between getxattr and removexattr because callers to getxattr do not necessarily take any sort of locks before calling into the filesystem. Although the race condition itself can be fixed through clever use of a memory barrier, further consideration of the use cases of extended attributes shows that most files always have at least one attribute, so we might as well make them permanent. v2: Minor tweaks suggested by Dave, and convert some more macros to helper functions. Signed-off-by: Darrick J. Wong <djwong@kernel.org> -----BEGIN PGP SIGNATURE----- iQIzBAABCgAdFiEEUzaAxoMeQq6m2jMV+H93GTRKtOsFAmLQRsAACgkQ+H93GTRK tOseOw/+JdSH2MU2xx+XoE5M/fStzGpw0UsoOqDo8kUPKDt3z12NwuczlL4OAiuw XFrN/1IAnxBsTD9YxFYbqoCPNi/VR81ajfWV7JqD2B1Joj0aATsxGDdNUYJnxCdU HMlMqP5o77XvArwkxFbgxYi7UGdAeNwXxqUJcJ8FopQo2lb8+SG6XzpLgGKnyrKT FRNKXNObplhtzOs/Bv8qYAxJulmmjkktFJXhK2OAUJlIDjFwFY9Wo2T4QuOVe9w+ NXFOYyu0BqWLpDZQkYKWoCnF0GNsUavS8DP6zZYW3qJ6mX/f1jmtfbOLAkHNhlh8 uHy/3k3SeQhKztTqM28sPioe6mdj2xocorDCCVBgGXgWxVF6aWeM/PS4tMTWN/Bg TWd1egERpeVC0Ymkm0LTCIDNuLqxsknK1G6sxXhwrQ8cw/70Gl08ePwgdyZ6hpD9 Q61iJQofcI7MJX189a2VSbbHRzFnZIA+uVK4oyhmdEkQVKTHgmzwHVP660oAv9bD Y5hqkWEoyKTaaCsOWRAPVXG3k03lq+TNcaGggZgwFx11Gw4oMEx5hMUztoP54xX4 aEXb1HWcCmMxy8llnFY/82baW98ucwl8FwWF1qhNIPT40mYx9IobDmvkCtNrAoOC 41U7O8CxxPlt7XKxoRhafQOAhzp0ZzuhCdbaFIUENV7pTAJtq5Q= =W3Ad -----END PGP SIGNATURE----- Merge tag 'make-attr-fork-permanent-5.20_2022-07-14' of git://git.kernel.org/pub/scm/linux/kernel/git/djwong/xfs-linux into xfs-5.20-mergeB xfs: make attr forks permanent This series fixes a use-after-free bug that syzbot uncovered. The UAF itself is a result of a race condition between getxattr and removexattr because callers to getxattr do not necessarily take any sort of locks before calling into the filesystem. Although the race condition itself can be fixed through clever use of a memory barrier, further consideration of the use cases of extended attributes shows that most files always have at least one attribute, so we might as well make them permanent. v2: Minor tweaks suggested by Dave, and convert some more macros to helper functions. Signed-off-by: Darrick J. Wong <djwong@kernel.org> * tag 'make-attr-fork-permanent-5.20_2022-07-14' of git://git.kernel.org/pub/scm/linux/kernel/git/djwong/xfs-linux: xfs: replace inode fork size macros with functions xfs: replace XFS_IFORK_Q with a proper predicate function xfs: use XFS_IFORK_Q to determine the presence of an xattr fork xfs: make inode attribute forks a permanent part of struct xfs_inode xfs: convert XFS_IFORK_PTR to a static inline helper
774 lines
21 KiB
C
774 lines
21 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_ag.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_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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* 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 unnecessary 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 behaviour 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_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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struct xfs_dinode *dip;
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xfs_agino_t unlinked_ino;
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int di_ok;
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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 = xfs_verify_magic16(bp, dip->di_magic) &&
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xfs_dinode_good_version(mp, dip->di_version) &&
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xfs_verify_agino_or_null(bp->b_pag, 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)xfs_buf_daddr(bp), 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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.magic16 = { cpu_to_be16(XFS_DINODE_MAGIC),
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cpu_to_be16(XFS_DINODE_MAGIC) },
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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 = "xfs_inode_ra",
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.magic16 = { cpu_to_be16(XFS_DINODE_MAGIC),
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cpu_to_be16(XFS_DINODE_MAGIC) },
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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.
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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_buf **bpp)
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{
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return xfs_trans_read_buf(mp, tp, mp->m_ddev_targp, imap->im_blkno,
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imap->im_len, XBF_UNMAPPED, bpp,
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&xfs_inode_buf_ops);
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}
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static inline struct timespec64 xfs_inode_decode_bigtime(uint64_t ts)
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{
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struct timespec64 tv;
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uint32_t n;
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tv.tv_sec = xfs_bigtime_to_unix(div_u64_rem(ts, NSEC_PER_SEC, &n));
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tv.tv_nsec = n;
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return tv;
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}
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/* Convert an ondisk timestamp to an incore timestamp. */
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struct timespec64
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xfs_inode_from_disk_ts(
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struct xfs_dinode *dip,
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const xfs_timestamp_t ts)
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{
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struct timespec64 tv;
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struct xfs_legacy_timestamp *lts;
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if (xfs_dinode_has_bigtime(dip))
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return xfs_inode_decode_bigtime(be64_to_cpu(ts));
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lts = (struct xfs_legacy_timestamp *)&ts;
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tv.tv_sec = (int)be32_to_cpu(lts->t_sec);
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tv.tv_nsec = (int)be32_to_cpu(lts->t_nsec);
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return tv;
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}
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int
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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 inode *inode = VFS_I(ip);
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int error;
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xfs_failaddr_t fa;
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ASSERT(ip->i_cowfp == NULL);
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fa = xfs_dinode_verify(ip->i_mount, ip->i_ino, from);
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if (fa) {
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xfs_inode_verifier_error(ip, -EFSCORRUPTED, "dinode", from,
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sizeof(*from), fa);
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return -EFSCORRUPTED;
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}
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/*
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* First get the permanent information that is needed to allocate an
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* inode. If the inode is unused, mode is zero and we shouldn't mess
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* with the uninitialized part of it.
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*/
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if (!xfs_has_v3inodes(ip->i_mount))
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ip->i_flushiter = be16_to_cpu(from->di_flushiter);
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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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if (!inode->i_mode)
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return 0;
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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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* They will also be unconditionally written back to disk as v2 inodes.
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*/
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if (unlikely(from->di_version == 1)) {
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set_nlink(inode, be16_to_cpu(from->di_onlink));
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ip->i_projid = 0;
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} else {
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set_nlink(inode, be32_to_cpu(from->di_nlink));
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ip->i_projid = (prid_t)be16_to_cpu(from->di_projid_hi) << 16 |
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be16_to_cpu(from->di_projid_lo);
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}
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i_uid_write(inode, be32_to_cpu(from->di_uid));
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i_gid_write(inode, be32_to_cpu(from->di_gid));
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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 = xfs_inode_from_disk_ts(from, from->di_atime);
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inode->i_mtime = xfs_inode_from_disk_ts(from, from->di_mtime);
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inode->i_ctime = xfs_inode_from_disk_ts(from, from->di_ctime);
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ip->i_disk_size = be64_to_cpu(from->di_size);
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ip->i_nblocks = be64_to_cpu(from->di_nblocks);
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ip->i_extsize = be32_to_cpu(from->di_extsize);
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ip->i_forkoff = from->di_forkoff;
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ip->i_diflags = be16_to_cpu(from->di_flags);
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ip->i_next_unlinked = be32_to_cpu(from->di_next_unlinked);
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if (from->di_dmevmask || from->di_dmstate)
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xfs_iflags_set(ip, XFS_IPRESERVE_DM_FIELDS);
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if (xfs_has_v3inodes(ip->i_mount)) {
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inode_set_iversion_queried(inode,
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be64_to_cpu(from->di_changecount));
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ip->i_crtime = xfs_inode_from_disk_ts(from, from->di_crtime);
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ip->i_diflags2 = be64_to_cpu(from->di_flags2);
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ip->i_cowextsize = be32_to_cpu(from->di_cowextsize);
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}
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error = xfs_iformat_data_fork(ip, from);
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if (error)
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return error;
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if (from->di_forkoff) {
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error = xfs_iformat_attr_fork(ip, from);
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if (error)
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goto out_destroy_data_fork;
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}
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if (xfs_is_reflink_inode(ip))
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xfs_ifork_init_cow(ip);
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return 0;
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out_destroy_data_fork:
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xfs_idestroy_fork(&ip->i_df);
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return error;
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}
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/* Convert an incore timestamp to an ondisk timestamp. */
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static inline xfs_timestamp_t
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xfs_inode_to_disk_ts(
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struct xfs_inode *ip,
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const struct timespec64 tv)
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{
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struct xfs_legacy_timestamp *lts;
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xfs_timestamp_t ts;
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if (xfs_inode_has_bigtime(ip))
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return cpu_to_be64(xfs_inode_encode_bigtime(tv));
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lts = (struct xfs_legacy_timestamp *)&ts;
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lts->t_sec = cpu_to_be32(tv.tv_sec);
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lts->t_nsec = cpu_to_be32(tv.tv_nsec);
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return ts;
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}
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static inline void
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xfs_inode_to_disk_iext_counters(
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struct xfs_inode *ip,
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struct xfs_dinode *to)
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{
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if (xfs_inode_has_large_extent_counts(ip)) {
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to->di_big_nextents = cpu_to_be64(xfs_ifork_nextents(&ip->i_df));
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to->di_big_anextents = cpu_to_be32(xfs_ifork_nextents(&ip->i_af));
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/*
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* We might be upgrading the inode to use larger extent counters
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* than was previously used. Hence zero the unused field.
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*/
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to->di_nrext64_pad = cpu_to_be16(0);
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} else {
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to->di_nextents = cpu_to_be32(xfs_ifork_nextents(&ip->i_df));
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to->di_anextents = cpu_to_be16(xfs_ifork_nextents(&ip->i_af));
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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 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_format = xfs_ifork_format(&ip->i_df);
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to->di_uid = cpu_to_be32(i_uid_read(inode));
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to->di_gid = cpu_to_be32(i_gid_read(inode));
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to->di_projid_lo = cpu_to_be16(ip->i_projid & 0xffff);
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to->di_projid_hi = cpu_to_be16(ip->i_projid >> 16);
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to->di_atime = xfs_inode_to_disk_ts(ip, inode->i_atime);
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to->di_mtime = xfs_inode_to_disk_ts(ip, inode->i_mtime);
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to->di_ctime = xfs_inode_to_disk_ts(ip, inode->i_ctime);
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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(ip->i_disk_size);
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to->di_nblocks = cpu_to_be64(ip->i_nblocks);
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to->di_extsize = cpu_to_be32(ip->i_extsize);
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to->di_forkoff = ip->i_forkoff;
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to->di_aformat = xfs_ifork_format(&ip->i_af);
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to->di_flags = cpu_to_be16(ip->i_diflags);
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if (xfs_has_v3inodes(ip->i_mount)) {
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to->di_version = 3;
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to->di_changecount = cpu_to_be64(inode_peek_iversion(inode));
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to->di_crtime = xfs_inode_to_disk_ts(ip, ip->i_crtime);
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to->di_flags2 = cpu_to_be64(ip->i_diflags2);
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to->di_cowextsize = cpu_to_be32(ip->i_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_v3_pad = 0;
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} else {
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to->di_version = 2;
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to->di_flushiter = cpu_to_be16(ip->i_flushiter);
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memset(to->di_v2_pad, 0, sizeof(to->di_v2_pad));
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}
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xfs_inode_to_disk_iext_counters(ip, to);
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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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xfs_extnum_t di_nextents;
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xfs_extnum_t max_extents;
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mode_t mode = be16_to_cpu(dip->di_mode);
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uint32_t fork_size = XFS_DFORK_SIZE(dip, mp, whichfork);
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uint32_t fork_format = XFS_DFORK_FORMAT(dip, whichfork);
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di_nextents = xfs_dfork_nextents(dip, whichfork);
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/*
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* For fork types that can contain local data, check that the fork
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* format matches the size of local data contained within the fork.
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*
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* For all types, check that when the size says the should be in extent
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* or btree format, the inode isn't claiming it is in local format.
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*/
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if (whichfork == XFS_DATA_FORK) {
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if (S_ISDIR(mode) || S_ISLNK(mode)) {
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if (be64_to_cpu(dip->di_size) <= fork_size &&
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fork_format != XFS_DINODE_FMT_LOCAL)
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return __this_address;
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}
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if (be64_to_cpu(dip->di_size) > fork_size &&
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fork_format == XFS_DINODE_FMT_LOCAL)
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return __this_address;
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}
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switch (fork_format) {
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case XFS_DINODE_FMT_LOCAL:
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/*
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* No local regular files yet.
|
|
*/
|
|
if (S_ISREG(mode) && whichfork == XFS_DATA_FORK)
|
|
return __this_address;
|
|
if (di_nextents)
|
|
return __this_address;
|
|
break;
|
|
case XFS_DINODE_FMT_EXTENTS:
|
|
if (di_nextents > XFS_DFORK_MAXEXT(dip, mp, whichfork))
|
|
return __this_address;
|
|
break;
|
|
case XFS_DINODE_FMT_BTREE:
|
|
max_extents = xfs_iext_max_nextents(
|
|
xfs_dinode_has_large_extent_counts(dip),
|
|
whichfork);
|
|
if (di_nextents > max_extents)
|
|
return __this_address;
|
|
break;
|
|
default:
|
|
return __this_address;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static xfs_failaddr_t
|
|
xfs_dinode_verify_forkoff(
|
|
struct xfs_dinode *dip,
|
|
struct xfs_mount *mp)
|
|
{
|
|
if (!dip->di_forkoff)
|
|
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) >> 3))
|
|
return __this_address;
|
|
break;
|
|
default:
|
|
return __this_address;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static xfs_failaddr_t
|
|
xfs_dinode_verify_nrext64(
|
|
struct xfs_mount *mp,
|
|
struct xfs_dinode *dip)
|
|
{
|
|
if (xfs_dinode_has_large_extent_counts(dip)) {
|
|
if (!xfs_has_large_extent_counts(mp))
|
|
return __this_address;
|
|
if (dip->di_nrext64_pad != 0)
|
|
return __this_address;
|
|
} else if (dip->di_version >= 3) {
|
|
if (dip->di_v3_pad != 0)
|
|
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;
|
|
xfs_extnum_t nextents;
|
|
xfs_extnum_t naextents;
|
|
xfs_filblks_t nblocks;
|
|
|
|
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_has_v3inodes(mp))
|
|
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;
|
|
|
|
fa = xfs_dinode_verify_nrext64(mp, dip);
|
|
if (fa)
|
|
return fa;
|
|
|
|
nextents = xfs_dfork_data_extents(dip);
|
|
naextents = xfs_dfork_attr_extents(dip);
|
|
nblocks = be64_to_cpu(dip->di_nblocks);
|
|
|
|
/* Fork checks carried over from xfs_iformat_fork */
|
|
if (mode && nextents + naextents > nblocks)
|
|
return __this_address;
|
|
|
|
if (S_ISDIR(mode) && nextents > mp->m_dir_geo->max_extents)
|
|
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 (dip->di_forkoff) {
|
|
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 (naextents)
|
|
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_has_reflink(mp))
|
|
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;
|
|
|
|
/* COW extent size hint validation */
|
|
fa = xfs_inode_validate_cowextsize(mp, be32_to_cpu(dip->di_cowextsize),
|
|
mode, flags, flags2);
|
|
if (fa)
|
|
return fa;
|
|
|
|
/* bigtime iflag can only happen on bigtime filesystems */
|
|
if (xfs_dinode_has_bigtime(dip) &&
|
|
!xfs_has_bigtime(mp))
|
|
return __this_address;
|
|
|
|
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_has_crc(mp));
|
|
crc = xfs_start_cksum_update((char *)dip, mp->m_sb.sb_inodesize,
|
|
XFS_DINODE_CRC_OFF);
|
|
dip->di_crc = xfs_end_cksum(crc);
|
|
}
|
|
|
|
/*
|
|
* Validate di_extsize hint.
|
|
*
|
|
* 1. Extent size hint is only valid for directories and regular files.
|
|
* 2. FS_XFLAG_EXTSIZE is only valid for regular files.
|
|
* 3. FS_XFLAG_EXTSZINHERIT is only valid for directories.
|
|
* 4. Hint cannot be larger than MAXTEXTLEN.
|
|
* 5. Can be changed on directories at any time.
|
|
* 6. Hint value of 0 turns off hints, clears inode flags.
|
|
* 7. Extent size must be a multiple of the appropriate block size.
|
|
* For realtime files, this is the rt extent size.
|
|
* 8. For non-realtime files, the extent size hint must be limited
|
|
* to half the AG size to avoid alignment extending the extent beyond the
|
|
* limits of the AG.
|
|
*/
|
|
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);
|
|
|
|
/*
|
|
* This comment describes a historic gap in this verifier function.
|
|
*
|
|
* For a directory with both RTINHERIT and EXTSZINHERIT flags set, this
|
|
* function has never checked that the extent size hint is an integer
|
|
* multiple of the realtime extent size. Since we allow users to set
|
|
* this combination on non-rt filesystems /and/ to change the rt
|
|
* extent size when adding a rt device to a filesystem, the net effect
|
|
* is that users can configure a filesystem anticipating one rt
|
|
* geometry and change their minds later. Directories do not use the
|
|
* extent size hint, so this is harmless for them.
|
|
*
|
|
* If a directory with a misaligned extent size hint is allowed to
|
|
* propagate that hint into a new regular realtime file, the result
|
|
* is that the inode cluster buffer verifier will trigger a corruption
|
|
* shutdown the next time it is run, because the verifier has always
|
|
* enforced the alignment rule for regular files.
|
|
*
|
|
* Because we allow administrators to set a new rt extent size when
|
|
* adding a rt section, we cannot add a check to this verifier because
|
|
* that will result a new source of directory corruption errors when
|
|
* reading an existing filesystem. Instead, we rely on callers to
|
|
* decide when alignment checks are appropriate, and fix things up as
|
|
* needed.
|
|
*/
|
|
|
|
if (rt_flag)
|
|
blocksize_bytes = XFS_FSB_TO_B(mp, mp->m_sb.sb_rextsize);
|
|
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 > XFS_MAX_BMBT_EXTLEN)
|
|
return __this_address;
|
|
|
|
if (!rt_flag && extsize > mp->m_sb.sb_agblocks / 2)
|
|
return __this_address;
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* Validate di_cowextsize hint.
|
|
*
|
|
* 1. CoW extent size hint can only be set if reflink is enabled on the fs.
|
|
* The inode does not have to have any shared blocks, but it must be a v3.
|
|
* 2. FS_XFLAG_COWEXTSIZE is only valid for directories and regular files;
|
|
* for a directory, the hint is propagated to new files.
|
|
* 3. Can be changed on files & directories at any time.
|
|
* 4. Hint value of 0 turns off hints, clears inode flags.
|
|
* 5. Extent size must be a multiple of the appropriate block size.
|
|
* 6. The extent size hint must be limited to half the AG size to avoid
|
|
* alignment extending the extent beyond the limits of the AG.
|
|
*/
|
|
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_has_reflink(mp))
|
|
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 > XFS_MAX_BMBT_EXTLEN)
|
|
return __this_address;
|
|
|
|
if (cowextsize > mp->m_sb.sb_agblocks / 2)
|
|
return __this_address;
|
|
|
|
return NULL;
|
|
}
|