File logprint-Fix-printing-of-AGF-and-AGI-buffers.patch of Package xfsprogs

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File logprint-Fix-printing-of-AGF-and-AGI-buffers.patch of Package xfsprogs (Revision 59f808e395e9b699a1b5de2e55c862cb)

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From 655b1e99f115f13f93143b69fe1a56d11f8651ee Mon Sep 17 00:00:00 2001
From: Jan Kara <jack@suse.cz>
Date: Mon, 14 Jul 2014 16:39:42 +0200
Subject: [PATCH] logprint: Fix printing of AGF and AGI buffers

Currently xfs_logprint doesn't show detailed data about AGF and AGI
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 or xfs_agi_t respectively.

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@suse.cz>
---
 logprint/log_misc.c | 20 ++++++++++++++++++--
 1 file changed, 18 insertions(+), 2 deletions(-)

diff --git a/logprint/log_misc.c b/logprint/log_misc.c
index d482cf3fba57..c9286c67b913 100644
--- a/logprint/log_misc.c
+++ b/logprint/log_misc.c
@@ -325,7 +325,15 @@ xlog_print_trans_buffer(xfs_caddr_t *ptr, int len, int *i, int num_ops)
 	} else if (be32_to_cpu(*(__be32 *)(*ptr)) == XFS_AGI_MAGIC) {
 		agi = (xfs_agi_t *)(*ptr);
 		printf(_("AGI Buffer: XAGI  "));
-		if (be32_to_cpu(head->oh_len) < sizeof(xfs_agi_t) -
+		/*
+		 * v4 filesystems only contain the fields before the uuid.
+		 * Even v5 filesystems don't log any field beneath it. That
+		 * means that the size that is logged is almost always going to
+		 * be smaller than the structure itself. Hence we need to make
+		 * sure that the buffer contains all the data we want to print
+		 * rather than just check against the structure size.
+		 */
+		if (be32_to_cpu(head->oh_len) < offsetof(xfs_agi_t, agi_uuid) -
 				XFS_AGI_UNLINKED_BUCKETS*sizeof(xfs_agino_t)) {
 			printf(_("out of space\n"));
 		} else {
@@ -367,7 +375,15 @@ 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)) {
+		/*
+		 * v4 filesystems only contain the fields before the uuid.
+		 * Even v5 filesystems don't log any field beneath it. That
+		 * means that the size that is logged is almost always going to
+		 * be smaller than the structure itself. Hence we need to make
+		 * sure that the buffer contains all the data we want to print
+		 * rather than just check against the structure size.
+		 */
+		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

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File logprint-Fix-printing-of-AGF-and-AGI-buffers.patch of Package xfsprogs (Revision 59f808e395e9b699a1b5de2e55c862cb)

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