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xfs: fix integer overflows in the fsmap rtbitmap and logdev backends

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It's not correct to use the rmap irec structure to hold query key
information to query the rtbitmap because the realtime volume can be
longer than 2^32 fsblocks in length.  Because the rt volume doesn't have
allocation groups, introduce a daddr-based record filtering algorithm
and compute the rtextent values using 64-bit variables.  The same
problem exists in the external log device fsmap implementation, so use
the same solution to fix it too.

After this patch, all the code that touches info->low and info->high
under xfs_getfsmap_logdev and __xfs_getfsmap_rtdev are unnecessary.
Cleaning this up will be done in subsequent patches.

Fixes: 4c934c7dd6 ("xfs: report realtime space information via the rtbitmap")
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
This commit is contained in:
Darrick J. Wong 2023-06-29 17:39:43 -07:00
parent 63ef7a3591
commit 7975aba19c
1 changed files with 64 additions and 26 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

90
fs/xfs/xfs_fsmap.c
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@ -160,6 +160,8 @@ struct xfs_getfsmap_info {
struct xfs_buf *agf_bp; /* AGF, for refcount queries */
struct xfs_perag *pag; /* AG info, if applicable */
xfs_daddr_t next_daddr; /* next daddr we expect */
/* daddr of low fsmap key when we're using the rtbitmap */
xfs_daddr_t low_daddr;
u64 missing_owner; /* owner of holes */
u32 dev; /* device id */
/*
@ -250,6 +252,8 @@ xfs_getfsmap_rec_before_start(
const struct xfs_rmap_irec *rec,
xfs_daddr_t rec_daddr)
{
if (info->low_daddr != -1ULL)
return rec_daddr < info->low_daddr;
if (info->low.rm_blockcount)
return xfs_rmap_compare(rec, &info->low) < 0;
return false;
@ -257,14 +261,16 @@ xfs_getfsmap_rec_before_start(
/*
* Format a reverse mapping for getfsmap, having translated rm_startblock
* into the appropriate daddr units.
* into the appropriate daddr units. Pass in a nonzero @len_daddr if the
* length could be larger than rm_blockcount in struct xfs_rmap_irec.
*/
STATIC int
xfs_getfsmap_helper(
struct xfs_trans *tp,
struct xfs_getfsmap_info *info,
const struct xfs_rmap_irec *rec,
xfs_daddr_t rec_daddr)
xfs_daddr_t rec_daddr,
xfs_daddr_t len_daddr)
{
struct xfs_fsmap fmr;
struct xfs_mount *mp = tp->t_mountp;
@ -274,12 +280,15 @@ xfs_getfsmap_helper(
if (fatal_signal_pending(current))
return -EINTR;
if (len_daddr == 0)
len_daddr = XFS_FSB_TO_BB(mp, rec->rm_blockcount);
/*
* Filter out records that start before our startpoint, if the
* caller requested that.
*/
if (xfs_getfsmap_rec_before_start(info, rec, rec_daddr)) {
rec_daddr += XFS_FSB_TO_BB(mp, rec->rm_blockcount);
rec_daddr += len_daddr;
if (info->next_daddr < rec_daddr)
info->next_daddr = rec_daddr;
return 0;
@ -298,7 +307,7 @@ xfs_getfsmap_helper(
info->head->fmh_entries++;
rec_daddr += XFS_FSB_TO_BB(mp, rec->rm_blockcount);
rec_daddr += len_daddr;
if (info->next_daddr < rec_daddr)
info->next_daddr = rec_daddr;
return 0;
@ -338,7 +347,7 @@ xfs_getfsmap_helper(
if (error)
return error;
fmr.fmr_offset = XFS_FSB_TO_BB(mp, rec->rm_offset);
fmr.fmr_length = XFS_FSB_TO_BB(mp, rec->rm_blockcount);
fmr.fmr_length = len_daddr;
if (rec->rm_flags & XFS_RMAP_UNWRITTEN)
fmr.fmr_flags |= FMR_OF_PREALLOC;
if (rec->rm_flags & XFS_RMAP_ATTR_FORK)
@ -355,7 +364,7 @@ xfs_getfsmap_helper(
xfs_getfsmap_format(mp, &fmr, info);
out:
rec_daddr += XFS_FSB_TO_BB(mp, rec->rm_blockcount);
rec_daddr += len_daddr;
if (info->next_daddr < rec_daddr)
info->next_daddr = rec_daddr;
return 0;
@ -376,7 +385,7 @@ xfs_getfsmap_datadev_helper(
fsb = XFS_AGB_TO_FSB(mp, cur->bc_ag.pag->pag_agno, rec->rm_startblock);
rec_daddr = XFS_FSB_TO_DADDR(mp, fsb);
return xfs_getfsmap_helper(cur->bc_tp, info, rec, rec_daddr);
return xfs_getfsmap_helper(cur->bc_tp, info, rec, rec_daddr, 0);
}
/* Transform a bnobt irec into a fsmap */
@ -400,7 +409,7 @@ xfs_getfsmap_datadev_bnobt_helper(
irec.rm_offset = 0;
irec.rm_flags = 0;
return xfs_getfsmap_helper(cur->bc_tp, info, &irec, rec_daddr);
return xfs_getfsmap_helper(cur->bc_tp, info, &irec, rec_daddr, 0);
}
/* Set rmap flags based on the getfsmap flags */
@ -427,9 +436,13 @@ xfs_getfsmap_logdev(
{
struct xfs_mount *mp = tp->t_mountp;
struct xfs_rmap_irec rmap;
xfs_daddr_t rec_daddr, len_daddr;
xfs_fsblock_t start_fsb;
int error;
/* Set up search keys */
start_fsb = XFS_BB_TO_FSBT(mp,
keys[0].fmr_physical + keys[0].fmr_length);
info->low.rm_startblock = XFS_BB_TO_FSBT(mp, keys[0].fmr_physical);
info->low.rm_offset = XFS_BB_TO_FSBT(mp, keys[0].fmr_offset);
error = xfs_fsmap_owner_to_rmap(&info->low, keys);
@ -438,6 +451,10 @@ xfs_getfsmap_logdev(
info->low.rm_blockcount = 0;
xfs_getfsmap_set_irec_flags(&info->low, &keys[0]);
/* Adjust the low key if we are continuing from where we left off. */
if (keys[0].fmr_length > 0)
info->low_daddr = XFS_FSB_TO_BB(mp, start_fsb);
error = xfs_fsmap_owner_to_rmap(&info->high, keys + 1);
if (error)
return error;
@ -451,7 +468,7 @@ xfs_getfsmap_logdev(
trace_xfs_fsmap_low_key(mp, info->dev, NULLAGNUMBER, &info->low);
trace_xfs_fsmap_high_key(mp, info->dev, NULLAGNUMBER, &info->high);
if (keys[0].fmr_physical > 0)
if (start_fsb > 0)
return 0;
/* Fabricate an rmap entry for the external log device. */
@ -461,7 +478,9 @@ xfs_getfsmap_logdev(
rmap.rm_offset = 0;
rmap.rm_flags = 0;
return xfs_getfsmap_helper(tp, info, &rmap, 0);
rec_daddr = XFS_FSB_TO_BB(mp, rmap.rm_startblock);
len_daddr = XFS_FSB_TO_BB(mp, rmap.rm_blockcount);
return xfs_getfsmap_helper(tp, info, &rmap, rec_daddr, len_daddr);
}
#ifdef CONFIG_XFS_RT
@ -475,16 +494,22 @@ xfs_getfsmap_rtdev_rtbitmap_helper(
{
struct xfs_getfsmap_info *info = priv;
struct xfs_rmap_irec irec;
xfs_daddr_t rec_daddr;
xfs_rtblock_t rtbno;
xfs_daddr_t rec_daddr, len_daddr;
rtbno = rec->ar_startext * mp->m_sb.sb_rextsize;
rec_daddr = XFS_FSB_TO_BB(mp, rtbno);
irec.rm_startblock = rtbno;
rtbno = rec->ar_extcount * mp->m_sb.sb_rextsize;
len_daddr = XFS_FSB_TO_BB(mp, rtbno);
irec.rm_blockcount = rtbno;
irec.rm_startblock = rec->ar_startext * mp->m_sb.sb_rextsize;
rec_daddr = XFS_FSB_TO_BB(mp, irec.rm_startblock);
irec.rm_blockcount = rec->ar_extcount * mp->m_sb.sb_rextsize;
irec.rm_owner = XFS_RMAP_OWN_NULL; /* "free" */
irec.rm_offset = 0;
irec.rm_flags = 0;
return xfs_getfsmap_helper(tp, info, &irec, rec_daddr);
return xfs_getfsmap_helper(tp, info, &irec, rec_daddr, len_daddr);
}
/* Execute a getfsmap query against the realtime device. */
@ -493,23 +518,26 @@ __xfs_getfsmap_rtdev(
struct xfs_trans *tp,
const struct xfs_fsmap *keys,
int (*query_fn)(struct xfs_trans *,
struct xfs_getfsmap_info *),
struct xfs_getfsmap_info *,
xfs_rtblock_t start_rtb,
xfs_rtblock_t end_rtb),
struct xfs_getfsmap_info *info)
{
struct xfs_mount *mp = tp->t_mountp;
xfs_fsblock_t start_fsb;
xfs_fsblock_t end_fsb;
xfs_rtblock_t start_rtb;
xfs_rtblock_t end_rtb;
uint64_t eofs;
int error = 0;
eofs = XFS_FSB_TO_BB(mp, mp->m_sb.sb_rblocks);
if (keys[0].fmr_physical >= eofs)
return 0;
start_fsb = XFS_BB_TO_FSBT(mp, keys[0].fmr_physical);
end_fsb = XFS_BB_TO_FSB(mp, min(eofs - 1, keys[1].fmr_physical));
start_rtb = XFS_BB_TO_FSBT(mp,
keys[0].fmr_physical + keys[0].fmr_length);
end_rtb = XFS_BB_TO_FSB(mp, min(eofs - 1, keys[1].fmr_physical));
/* Set up search keys */
info->low.rm_startblock = start_fsb;
info->low.rm_startblock = start_rtb;
error = xfs_fsmap_owner_to_rmap(&info->low, &keys[0]);
if (error)
return error;
@ -517,7 +545,14 @@ __xfs_getfsmap_rtdev(
info->low.rm_blockcount = 0;
xfs_getfsmap_set_irec_flags(&info->low, &keys[0]);
info->high.rm_startblock = end_fsb;
/* Adjust the low key if we are continuing from where we left off. */
if (keys[0].fmr_length > 0) {
info->low_daddr = XFS_FSB_TO_BB(mp, start_rtb);
if (info->low_daddr >= eofs)
return 0;
}
info->high.rm_startblock = end_rtb;
error = xfs_fsmap_owner_to_rmap(&info->high, &keys[1]);
if (error)
return error;
@ -528,14 +563,16 @@ __xfs_getfsmap_rtdev(
trace_xfs_fsmap_low_key(mp, info->dev, NULLAGNUMBER, &info->low);
trace_xfs_fsmap_high_key(mp, info->dev, NULLAGNUMBER, &info->high);
return query_fn(tp, info);
return query_fn(tp, info, start_rtb, end_rtb);
}
/* Actually query the realtime bitmap. */
STATIC int
xfs_getfsmap_rtdev_rtbitmap_query(
struct xfs_trans *tp,
struct xfs_getfsmap_info *info)
struct xfs_getfsmap_info *info,
xfs_rtblock_t start_rtb,
xfs_rtblock_t end_rtb)
{
struct xfs_rtalloc_rec alow = { 0 };
struct xfs_rtalloc_rec ahigh = { 0 };
@ -548,8 +585,8 @@ xfs_getfsmap_rtdev_rtbitmap_query(
* Set up query parameters to return free rtextents covering the range
* we want.
*/
alow.ar_startext = info->low.rm_startblock;
ahigh.ar_startext = info->high.rm_startblock;
alow.ar_startext = start_rtb;
ahigh.ar_startext = end_rtb;
do_div(alow.ar_startext, mp->m_sb.sb_rextsize);
if (do_div(ahigh.ar_startext, mp->m_sb.sb_rextsize))
ahigh.ar_startext++;
@ -988,6 +1025,7 @@ xfs_getfsmap(
info.dev = handlers[i].dev;
info.last = false;
info.pag = NULL;
info.low_daddr = -1ULL;
info.low.rm_blockcount = 0;
error = handlers[i].fn(tp, dkeys, &info);
if (error)