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-rw-r--r--fs/xfs/libxfs/xfs_bmap.c11
-rw-r--r--fs/xfs/libxfs/xfs_bmap.h1
-rw-r--r--fs/xfs/xfs_aops.c13
3 files changed, 25 insertions, 0 deletions
diff --git a/fs/xfs/libxfs/xfs_bmap.c b/fs/xfs/libxfs/xfs_bmap.c
index def32fa1c225..89263797cf32 100644
--- a/fs/xfs/libxfs/xfs_bmap.c
+++ b/fs/xfs/libxfs/xfs_bmap.c
@@ -3852,6 +3852,17 @@ xfs_trim_extent(
}
}
+/* trim extent to within eof */
+void
+xfs_trim_extent_eof(
+ struct xfs_bmbt_irec *irec,
+ struct xfs_inode *ip)
+
+{
+ xfs_trim_extent(irec, 0, XFS_B_TO_FSB(ip->i_mount,
+ i_size_read(VFS_I(ip))));
+}
+
/*
* Trim the returned map to the required bounds
*/
diff --git a/fs/xfs/libxfs/xfs_bmap.h b/fs/xfs/libxfs/xfs_bmap.h
index 851982a5dfbc..502e0d8fb4ff 100644
--- a/fs/xfs/libxfs/xfs_bmap.h
+++ b/fs/xfs/libxfs/xfs_bmap.h
@@ -208,6 +208,7 @@ void xfs_bmap_trace_exlist(struct xfs_inode *ip, xfs_extnum_t cnt,
void xfs_trim_extent(struct xfs_bmbt_irec *irec, xfs_fileoff_t bno,
xfs_filblks_t len);
+void xfs_trim_extent_eof(struct xfs_bmbt_irec *, struct xfs_inode *);
int xfs_bmap_add_attrfork(struct xfs_inode *ip, int size, int rsvd);
void xfs_bmap_local_to_extents_empty(struct xfs_inode *ip, int whichfork);
void xfs_bmap_add_free(struct xfs_mount *mp, struct xfs_defer_ops *dfops,
diff --git a/fs/xfs/xfs_aops.c b/fs/xfs/xfs_aops.c
index 067284d84d9e..a3eeaba156c5 100644
--- a/fs/xfs/xfs_aops.c
+++ b/fs/xfs/xfs_aops.c
@@ -446,6 +446,19 @@ xfs_imap_valid(
{
offset >>= inode->i_blkbits;
+ /*
+ * We have to make sure the cached mapping is within EOF to protect
+ * against eofblocks trimming on file release leaving us with a stale
+ * mapping. Otherwise, a page for a subsequent file extending buffered
+ * write could get picked up by this writeback cycle and written to the
+ * wrong blocks.
+ *
+ * Note that what we really want here is a generic mapping invalidation
+ * mechanism to protect us from arbitrary extent modifying contexts, not
+ * just eofblocks.
+ */
+ xfs_trim_extent_eof(imap, XFS_I(inode));
+
return offset >= imap->br_startoff &&
offset < imap->br_startoff + imap->br_blockcount;
}