UBIFS: always clean up GC LEB space
When we mount UBIFS, GC LEB may contain out-of-date information,
and UBIFS should update lprops and set free space for thei LEB.
Currently UBIFS does this only if mounted R/W. But for R/O mount
we have to do the same, because otherwise we will have incorrect
FS free space reported to user-space.
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
diff --git a/fs/ubifs/super.c b/fs/ubifs/super.c
index 5c814a7..336073e 100644
--- a/fs/ubifs/super.c
+++ b/fs/ubifs/super.c
@@ -397,6 +397,7 @@
buf->f_namelen = UBIFS_MAX_NLEN;
buf->f_fsid.val[0] = le32_to_cpu(uuid[0]) ^ le32_to_cpu(uuid[2]);
buf->f_fsid.val[1] = le32_to_cpu(uuid[1]) ^ le32_to_cpu(uuid[3]);
+ ubifs_assert(buf->f_bfree <= c->block_cnt);
return 0;
}
@@ -735,12 +736,12 @@
* take_gc_lnum - reserve GC LEB.
* @c: UBIFS file-system description object
*
- * This function ensures that the LEB reserved for garbage collection is
- * unmapped and is marked as "taken" in lprops. We also have to set free space
- * to LEB size and dirty space to zero, because lprops may contain out-of-date
- * information if the file-system was un-mounted before it has been committed.
- * This function returns zero in case of success and a negative error code in
- * case of failure.
+ * This function ensures that the LEB reserved for garbage collection is marked
+ * as "taken" in lprops. We also have to set free space to LEB size and dirty
+ * space to zero, because lprops may contain out-of-date information if the
+ * file-system was un-mounted before it has been committed. This function
+ * returns zero in case of success and a negative error code in case of
+ * failure.
*/
static int take_gc_lnum(struct ubifs_info *c)
{
@@ -751,10 +752,6 @@
return -EINVAL;
}
- err = ubifs_leb_unmap(c, c->gc_lnum);
- if (err)
- return err;
-
/* And we have to tell lprops that this LEB is taken */
err = ubifs_change_one_lp(c, c->gc_lnum, c->leb_size, 0,
LPROPS_TAKEN, 0, 0);
@@ -1280,10 +1277,19 @@
if (err)
goto out_orphans;
err = ubifs_rcvry_gc_commit(c);
- } else
+ } else {
err = take_gc_lnum(c);
- if (err)
- goto out_orphans;
+ if (err)
+ goto out_orphans;
+
+ /*
+ * GC LEB may contain garbage if there was an unclean
+ * reboot, and it should be un-mapped.
+ */
+ err = ubifs_leb_unmap(c, c->gc_lnum);
+ if (err)
+ return err;
+ }
err = dbg_check_lprops(c);
if (err)
@@ -1292,6 +1298,16 @@
err = ubifs_recover_size(c);
if (err)
goto out_orphans;
+ } else {
+ /*
+ * Even if we mount read-only, we have to set space in GC LEB
+ * to proper value because this affects UBIFS free space
+ * reporting. We do not want to have a situation when
+ * re-mounting from R/O to R/W changes amount of free space.
+ */
+ err = take_gc_lnum(c);
+ if (err)
+ goto out_orphans;
}
spin_lock(&ubifs_infos_lock);
@@ -1316,6 +1332,8 @@
goto out_infos;
c->always_chk_crc = 0;
+ /* GC LEB has to be empty and taken at this point */
+ ubifs_assert(c->lst.taken_empty_lebs == 1);
ubifs_msg("mounted UBI device %d, volume %d, name \"%s\"",
c->vi.ubi_num, c->vi.vol_id, c->vi.name);
@@ -1561,7 +1579,7 @@
if (c->need_recovery)
err = ubifs_rcvry_gc_commit(c);
else
- err = take_gc_lnum(c);
+ err = ubifs_leb_unmap(c, c->gc_lnum);
if (err)
goto out;
@@ -1786,6 +1804,7 @@
c->bu.buf = NULL;
}
+ ubifs_assert(c->lst.taken_empty_lebs == 1);
return 0;
}