[PATCH] logprint: Fix printing of AGF buffers

[Jan Kara]

Currently xfs_logprint doesn't show detailed data about AGF buffers and
instead always shows "Out of space". This is because xfs_agf_t has
additional fields and padding which we never read from disk and thus
buffer length is always smaller than the size of xfs_agf_t.

Fix the problem by only making sure we have enough data in the buffer
to contain all the information we want to print.

Signed-off-by: Jan Kara <jack at suse.cz>
---
 logprint/log_misc.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/logprint/log_misc.c b/logprint/log_misc.c
index d482cf3fba57..e7306c08789a 100644
--- a/logprint/log_misc.c
+++ b/logprint/log_misc.c
@@ -367,7 +367,8 @@ xlog_print_trans_buffer(xfs_caddr_t *ptr, int len, int *i, int num_ops)
 	} else if (be32_to_cpu(*(__be32 *)(*ptr)) == XFS_AGF_MAGIC) {
 		agf = (xfs_agf_t *)(*ptr);
 		printf(_("AGF Buffer: XAGF  "));
-		if (be32_to_cpu(head->oh_len) < sizeof(xfs_agf_t)) {
+		/* Make sure buffer contains all the data we want to print */
+		if (be32_to_cpu(head->oh_len) < offsetof(xfs_agf_t, agf_uuid)) {
 			printf(_("Out of space\n"));
 		} else {
 			printf("\n");
-- 
1.8.1.4