The branch main has been updated by mckusick:

URL: 
https://cgit.FreeBSD.org/src/commit/?id=68dc94c7d314b02ef80fe972f524a2b3c6e68a1c

commit 68dc94c7d314b02ef80fe972f524a2b3c6e68a1c
Author:     Kirk McKusick <mckus...@freebsd.org>
AuthorDate: 2020-12-31 23:15:44 +0000
Commit:     Kirk McKusick <mckus...@freebsd.org>
CommitDate: 2020-12-31 23:36:33 +0000

    Correct and add some comments.
    
    Sponsored by: Netflix
---
 sbin/fsck_ffs/fsck.h | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/sbin/fsck_ffs/fsck.h b/sbin/fsck_ffs/fsck.h
index 8c7fe6d693c9..a471d1979438 100644
--- a/sbin/fsck_ffs/fsck.h
+++ b/sbin/fsck_ffs/fsck.h
@@ -137,11 +137,11 @@ extern struct inostatlist {
  */
 struct bufarea {
        TAILQ_ENTRY(bufarea) b_list;            /* buffer list */
-       ufs2_daddr_t b_bno;
-       int b_size;
-       int b_errs;
-       int b_flags;
-       int b_type;
+       ufs2_daddr_t b_bno;                     /* disk block number */
+       int b_size;                             /* size of I/O */
+       int b_errs;                             /* I/O error */
+       int b_flags;                            /* B_ flags below */
+       int b_type;                             /* BT_ type below */
        union {
                char *b_buf;                    /* buffer space */
                ufs1_daddr_t *b_indir1;         /* UFS1 indirect block */
@@ -172,14 +172,14 @@ struct bufarea {
 /*
  * Type of data in buffer
  */
-#define        BT_UNKNOWN       0      /* Buffer holds a superblock */
+#define        BT_UNKNOWN       0      /* Buffer type is unknown */
 #define        BT_SUPERBLK      1      /* Buffer holds a superblock */
 #define        BT_CYLGRP        2      /* Buffer holds a cylinder group map */
 #define        BT_LEVEL1        3      /* Buffer holds single level indirect */
 #define        BT_LEVEL2        4      /* Buffer holds double level indirect */
 #define        BT_LEVEL3        5      /* Buffer holds triple level indirect */
 #define        BT_EXTATTR       6      /* Buffer holds external attribute data 
*/
-#define        BT_INODES        7      /* Buffer holds external attribute data 
*/
+#define        BT_INODES        7      /* Buffer holds inodes */
 #define        BT_DIRDATA       8      /* Buffer holds directory data */
 #define        BT_DATA          9      /* Buffer holds user data */
 #define BT_NUMBUFTYPES 10
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