[PATCH 127/145] xfs_repair: record reflink inode state

["Darrick J. Wong" <darrick.wong@xxxxxxxxxx>]

Record the state of the per-inode reflink flag, so that we can
compare against the rmap data and update the flags accordingly.
Clear the (reflink) state if we clear the inode.

Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
---
 repair/dino_chunks.c |    1 +
 repair/dinode.c      |    6 ++++++
 repair/incore.h      |   38 ++++++++++++++++++++++++++++++++++++++
 repair/incore_ino.c  |    2 ++
 repair/rmap.c        |   26 ++++++++++++++++++++++++++
 repair/rmap.h        |    2 ++
 6 files changed, 75 insertions(+)


diff --git a/repair/dino_chunks.c b/repair/dino_chunks.c
index 7dbaca6..4db9512 100644
--- a/repair/dino_chunks.c
+++ b/repair/dino_chunks.c
@@ -931,6 +931,7 @@ next_readbuf:
                                do_warn(_("would have cleared inode %" PRIu64 
"\n"),
                                        ino);
                        }
+                       clear_inode_was_rl(ino_rec, irec_offset);
                }
 
 process_next:
diff --git a/repair/dinode.c b/repair/dinode.c
index ecba3be..d48e415 100644
--- a/repair/dinode.c
+++ b/repair/dinode.c
@@ -2636,6 +2636,12 @@ _("bad non-zero extent size %u for non-realtime/extsize 
inode %" PRIu64 ", "),
                goto clear_bad_out;
 
        /*
+        * record the state of the reflink flag
+        */
+       if (collect_rmaps)
+               record_inode_reflink_flag(mp, dino, agno, ino, lino);
+
+       /*
         * check data fork -- if it's bad, clear the inode
         */
        if (process_inode_data_fork(mp, agno, ino, dino, type, dirty,
diff --git a/repair/incore.h b/repair/incore.h
index b6c4b4f..bcd2f4b 100644
--- a/repair/incore.h
+++ b/repair/incore.h
@@ -283,6 +283,8 @@ typedef struct ino_tree_node  {
        __uint64_t              ir_sparse;      /* sparse inode bitmask */
        __uint64_t              ino_confirmed;  /* confirmed bitmask */
        __uint64_t              ino_isa_dir;    /* bit == 1 if a directory */
+       __uint64_t              ino_was_rl;     /* bit == 1 if reflink flag set 
*/
+       __uint64_t              ino_is_rl;      /* bit == 1 if reflink flag 
should be set */
        __uint8_t               nlink_size;
        union ino_nlink         disk_nlinks;    /* on-disk nlinks, set in P3 */
        union  {
@@ -494,6 +496,42 @@ static inline bool is_inode_sparse(struct ino_tree_node 
*irec, int offset)
 }
 
 /*
+ * set/clear/test was inode marked as reflinked
+ */
+static inline void set_inode_was_rl(struct ino_tree_node *irec, int offset)
+{
+       irec->ino_was_rl |= IREC_MASK(offset);
+}
+
+static inline void clear_inode_was_rl(struct ino_tree_node *irec, int offset)
+{
+       irec->ino_was_rl &= ~IREC_MASK(offset);
+}
+
+static inline int inode_was_rl(struct ino_tree_node *irec, int offset)
+{
+       return (irec->ino_was_rl & IREC_MASK(offset)) != 0;
+}
+
+/*
+ * set/clear/test should inode be marked as reflinked
+ */
+static inline void set_inode_is_rl(struct ino_tree_node *irec, int offset)
+{
+       irec->ino_is_rl |= IREC_MASK(offset);
+}
+
+static inline void clear_inode_is_rl(struct ino_tree_node *irec, int offset)
+{
+       irec->ino_is_rl &= ~IREC_MASK(offset);
+}
+
+static inline int inode_is_rl(struct ino_tree_node *irec, int offset)
+{
+       return (irec->ino_is_rl & IREC_MASK(offset)) != 0;
+}
+
+/*
  * add_inode_reached() is set on inode I only if I has been reached
  * by an inode P claiming to be the parent and if I is a directory,
  * the .. link in the I says that P is I's parent.
diff --git a/repair/incore_ino.c b/repair/incore_ino.c
index 1898257..2ec1765 100644
--- a/repair/incore_ino.c
+++ b/repair/incore_ino.c
@@ -257,6 +257,8 @@ alloc_ino_node(
        irec->ino_startnum = starting_ino;
        irec->ino_confirmed = 0;
        irec->ino_isa_dir = 0;
+       irec->ino_was_rl = 0;
+       irec->ino_is_rl = 0;
        irec->ir_free = (xfs_inofree_t) - 1;
        irec->ir_sparse = 0;
        irec->ino_un.ex_data = NULL;
diff --git a/repair/rmap.c b/repair/rmap.c
index 4da8003..6a62665 100644
--- a/repair/rmap.c
+++ b/repair/rmap.c
@@ -1073,6 +1073,32 @@ rmap_high_key_from_rec(
 }
 
 /*
+ * Record that an inode had the reflink flag set when repair started.  The
+ * inode reflink flag will be adjusted as necessary.
+ */
+void
+record_inode_reflink_flag(
+       struct xfs_mount        *mp,
+       struct xfs_dinode       *dino,
+       xfs_agnumber_t          agno,
+       xfs_agino_t             ino,
+       xfs_ino_t               lino)
+{
+       struct ino_tree_node    *irec;
+       int                     off;
+
+       ASSERT(XFS_AGINO_TO_INO(mp, agno, ino) == be64_to_cpu(dino->di_ino));
+       if (!(be64_to_cpu(dino->di_flags2) & XFS_DIFLAG2_REFLINK))
+               return;
+       irec = find_inode_rec(mp, agno, ino);
+       off = get_inode_offset(mp, lino, irec);
+       ASSERT(!inode_was_rl(irec, off));
+       set_inode_was_rl(irec, off);
+       dbg_printf("set was_rl lino=%llu was=0x%llx\n",
+               (unsigned long long)lino, (unsigned long long)irec->ino_was_rl);
+}
+
+/*
  * Regenerate the AGFL so that we don't run out of it while rebuilding the
  * rmap btree.  If skip_rmapbt is true, don't update the rmapbt (most probably
  * because we're updating the rmapbt).
diff --git a/repair/rmap.h b/repair/rmap.h
index 65f33e0..47b2f3b 100644
--- a/repair/rmap.h
+++ b/repair/rmap.h
@@ -50,6 +50,8 @@ extern void rmap_high_key_from_rec(struct xfs_rmap_irec *rec,
                struct xfs_rmap_irec *key);
 
 extern int compute_refcounts(struct xfs_mount *, xfs_agnumber_t);
+extern void record_inode_reflink_flag(struct xfs_mount *, struct xfs_dinode *,
+       xfs_agnumber_t, xfs_agino_t, xfs_ino_t);
 
 extern void fix_freelist(struct xfs_mount *, xfs_agnumber_t, bool);
 extern void rmap_store_agflcount(struct xfs_mount *, xfs_agnumber_t, int);