Btrfs: print bytenr instead of page pointer in check-int

The page pointer information was useless. The bytenr is what you
want when you search for submitted write bios.

Additionally, a new bit in the print mask is added that allows
to selectively enable the check-int submit_bio verbose mode. Before,
the global verbose mode had to be enabled leading to many million
useless lines in the kernel log.

And a comment is added that explains that LOG_BUF_SHIFT needs to
be set to a really high value.

Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>

diff --git a/fs/btrfs/check-integrity.c b/fs/btrfs/check-integrity.c
index e0aab44..b50764b 100644 (file)
--- a/fs/btrfs/check-integrity.c
+++ b/fs/btrfs/check-integrity.c
@@ -77,6 +77,15 @@
  * the integrity of (super)-block write requests, do not
  * enable the config option BTRFS_FS_CHECK_INTEGRITY to
  * include and compile the integrity check tool.
+ *
+ * Expect millions of lines of information in the kernel log with an
+ * enabled check_int_print_mask. Therefore set LOG_BUF_SHIFT in the
+ * kernel config to at least 26 (which is 64MB). Usually the value is
+ * limited to 21 (which is 2MB) in init/Kconfig. The file needs to be
+ * changed like this before LOG_BUF_SHIFT can be set to a high value:
+ * config LOG_BUF_SHIFT
+ *       int "Kernel log buffer size (16 => 64KB, 17 => 128KB)"
+ *       range 12 30
  */
 
 #include <linux/sched.h>
@@ -124,6 +133,7 @@
 #define BTRFSIC_PRINT_MASK_INITIAL_DATABASE                    0x00000400
 #define BTRFSIC_PRINT_MASK_NUM_COPIES                          0x00000800
 #define BTRFSIC_PRINT_MASK_TREE_WITH_ALL_MIRRORS               0x00001000
+#define BTRFSIC_PRINT_MASK_SUBMIT_BIO_BH_VERBOSE               0x00002000
 
 struct btrfsic_dev_state;
 struct btrfsic_state;
@@ -3015,6 +3025,7 @@ void btrfsic_submit_bio(int rw, struct bio *bio)
            (rw & WRITE) && NULL != bio->bi_io_vec) {
                unsigned int i;
                u64 dev_bytenr;
+               u64 cur_bytenr;
                int bio_is_patched;
                char **mapped_datav;
 
@@ -3033,6 +3044,7 @@ void btrfsic_submit_bio(int rw, struct bio *bio)
                                       GFP_NOFS);
                if (!mapped_datav)
                        goto leave;
+               cur_bytenr = dev_bytenr;
                for (i = 0; i < bio->bi_vcnt; i++) {
                        BUG_ON(bio->bi_io_vec[i].bv_len != PAGE_CACHE_SIZE);
                        mapped_datav[i] = kmap(bio->bi_io_vec[i].bv_page);
@@ -3044,16 +3056,13 @@ void btrfsic_submit_bio(int rw, struct bio *bio)
                                kfree(mapped_datav);
                                goto leave;
                        }
-                       if ((BTRFSIC_PRINT_MASK_SUBMIT_BIO_BH |
-                            BTRFSIC_PRINT_MASK_VERBOSE) ==
-                           (dev_state->state->print_mask &
-                            (BTRFSIC_PRINT_MASK_SUBMIT_BIO_BH |
-                             BTRFSIC_PRINT_MASK_VERBOSE)))
+                       if (dev_state->state->print_mask &
+                           BTRFSIC_PRINT_MASK_SUBMIT_BIO_BH_VERBOSE)
                                printk(KERN_INFO
-                                      "#%u: page=%p, len=%u, offset=%u\n",
-                                      i, bio->bi_io_vec[i].bv_page,
-                                      bio->bi_io_vec[i].bv_len,
+                                      "#%u: bytenr=%llu, len=%u, offset=%u\n",
+                                      i, cur_bytenr, bio->bi_io_vec[i].bv_len,
                                       bio->bi_io_vec[i].bv_offset);
+                       cur_bytenr += bio->bi_io_vec[i].bv_len;
                }
                btrfsic_process_written_block(dev_state, dev_bytenr,
                                              mapped_datav, bio->bi_vcnt,