1 files changed, 92 insertions, 16 deletions

diff --git a/fs/xfs/scrub/rtbitmap.c b/fs/xfs/scrub/rtbitmap.c
index 41a1d89ae8..4658351737 100644
--- a/fs/xfs/scrub/rtbitmap.c
+++ b/fs/xfs/scrub/rtbitmap.c
@@ -14,17 +14,34 @@
 #include "xfs_rtbitmap.h"
 #include "xfs_inode.h"
 #include "xfs_bmap.h"
+#include "xfs_bit.h"
+#include "xfs_sb.h"
 #include "scrub/scrub.h"
 #include "scrub/common.h"
+#include "scrub/repair.h"
+#include "scrub/rtbitmap.h"
 
 /* Set us up with the realtime metadata locked. */
 int
 xchk_setup_rtbitmap(
 	struct xfs_scrub	*sc)
 {
+	struct xfs_mount	*mp = sc->mp;
+	struct xchk_rtbitmap	*rtb;
 	int			error;
 
-	error = xchk_trans_alloc(sc, 0);
+	rtb = kzalloc(sizeof(struct xchk_rtbitmap), XCHK_GFP_FLAGS);
+	if (!rtb)
+		return -ENOMEM;
+	sc->buf = rtb;
+
+	if (xchk_could_repair(sc)) {
+		error = xrep_setup_rtbitmap(sc, rtb);
+		if (error)
+			return error;
+	}
+
+	error = xchk_trans_alloc(sc, rtb->resblks);
 	if (error)
 		return error;
 
@@ -32,7 +49,22 @@ xchk_setup_rtbitmap(
 	if (error)
 		return error;
 
+	error = xchk_ino_dqattach(sc);
+	if (error)
+		return error;
+
 	xchk_ilock(sc, XFS_ILOCK_EXCL | XFS_ILOCK_RTBITMAP);
+
+	/*
+	 * Now that we've locked the rtbitmap, we can't race with growfsrt
+	 * trying to expand the bitmap or change the size of the rt volume.
+	 * Hence it is safe to compute and check the geometry values.
+	 */
+	if (mp->m_sb.sb_rblocks) {
+		rtb->rextents = xfs_rtb_to_rtx(mp, mp->m_sb.sb_rblocks);
+		rtb->rextslog = xfs_compute_rextslog(rtb->rextents);
+		rtb->rbmblocks = xfs_rtbitmap_blockcount(mp, rtb->rextents);
+	}
 	return 0;
 }
 
@@ -63,21 +95,30 @@ STATIC int
 xchk_rtbitmap_check_extents(
 	struct xfs_scrub	*sc)
 {
-	struct xfs_mount	*mp = sc->mp;
 	struct xfs_bmbt_irec	map;
-	xfs_rtblock_t		off;
-	int			nmap;
+	struct xfs_iext_cursor	icur;
+	struct xfs_mount	*mp = sc->mp;
+	struct xfs_inode	*ip = sc->ip;
+	xfs_fileoff_t		off = 0;
+	xfs_fileoff_t		endoff;
 	int			error = 0;
 
-	for (off = 0; off < mp->m_sb.sb_rbmblocks;) {
+	/* Mappings may not cross or lie beyond EOF. */
+	endoff = XFS_B_TO_FSB(mp, ip->i_disk_size);
+	if (xfs_iext_lookup_extent(ip, &ip->i_df, endoff, &icur, &map)) {
+		xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, endoff);
+		return 0;
+	}
+
+	while (off < endoff) {
+		int		nmap = 1;
+
 		if (xchk_should_terminate(sc, &error) ||
 		    (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT))
 			break;
 
 		/* Make sure we have a written extent. */
-		nmap = 1;
-		error = xfs_bmapi_read(mp->m_rbmip, off,
-				mp->m_sb.sb_rbmblocks - off, &map, &nmap,
+		error = xfs_bmapi_read(ip, off, endoff - off, &map, &nmap,
 				XFS_DATA_FORK);
 		if (!xchk_fblock_process_error(sc, XFS_DATA_FORK, off, &error))
 			break;
@@ -98,12 +139,48 @@ int
 xchk_rtbitmap(
 	struct xfs_scrub	*sc)
 {
+	struct xfs_mount	*mp = sc->mp;
+	struct xchk_rtbitmap	*rtb = sc->buf;
 	int			error;
 
-	/* Is the size of the rtbitmap correct? */
-	if (sc->mp->m_rbmip->i_disk_size !=
-	    XFS_FSB_TO_B(sc->mp, sc->mp->m_sb.sb_rbmblocks)) {
-		xchk_ino_set_corrupt(sc, sc->mp->m_rbmip->i_ino);
+	/* Is sb_rextents correct? */
+	if (mp->m_sb.sb_rextents != rtb->rextents) {
+		xchk_ino_set_corrupt(sc, mp->m_rbmip->i_ino);
+		return 0;
+	}
+
+	/* Is sb_rextslog correct? */
+	if (mp->m_sb.sb_rextslog != rtb->rextslog) {
+		xchk_ino_set_corrupt(sc, mp->m_rbmip->i_ino);
+		return 0;
+	}
+
+	/*
+	 * Is sb_rbmblocks large enough to handle the current rt volume?  In no
+	 * case can we exceed 4bn bitmap blocks since the super field is a u32.
+	 */
+	if (rtb->rbmblocks > U32_MAX) {
+		xchk_ino_set_corrupt(sc, mp->m_rbmip->i_ino);
+		return 0;
+	}
+	if (mp->m_sb.sb_rbmblocks != rtb->rbmblocks) {
+		xchk_ino_set_corrupt(sc, mp->m_rbmip->i_ino);
+		return 0;
+	}
+
+	/* The bitmap file length must be aligned to an fsblock. */
+	if (mp->m_rbmip->i_disk_size & mp->m_blockmask) {
+		xchk_ino_set_corrupt(sc, mp->m_rbmip->i_ino);
+		return 0;
+	}
+
+	/*
+	 * Is the bitmap file itself large enough to handle the rt volume?
+	 * growfsrt expands the bitmap file before updating sb_rextents, so the
+	 * file can be larger than sb_rbmblocks.
+	 */
+	if (mp->m_rbmip->i_disk_size < XFS_FSB_TO_B(mp, rtb->rbmblocks)) {
+		xchk_ino_set_corrupt(sc, mp->m_rbmip->i_ino);
 		return 0;
 	}
 
@@ -116,12 +193,11 @@ xchk_rtbitmap(
 	if (error || (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT))
 		return error;
 
-	error = xfs_rtalloc_query_all(sc->mp, sc->tp, xchk_rtbitmap_rec, sc);
+	error = xfs_rtalloc_query_all(mp, sc->tp, xchk_rtbitmap_rec, sc);
 	if (!xchk_fblock_process_error(sc, XFS_DATA_FORK, 0, &error))
-		goto out;
+		return error;
 
-out:
-	return error;
+	return 0;
 }
 
 /* xref check that the extent is not free in the rtbitmap */