linux-ext4 - [PATCH] debugfs: allow do_write() to handle files over 4GB

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Message-Id: <1406245759-1617-1-git-send-email-adilger@dilger.ca>
Date:	Thu, 24 Jul 2014 17:49:19 -0600
From:	Andreas Dilger <adilger@...ger.ca>
To:	tytso@....edu
Cc:	linux-ext4@...r.kernel.org, Andreas Dilger <adilger@...ger.ca>
Subject: [PATCH] debugfs: allow do_write() to handle files over 4GB

Fix debugfs do_write() to correctly set i_size_high if the source
file is larger than 4GB.  Otherwise, only the low 32 bits of the
size is stored in i_size.

Signed-off-by: Andreas Dilger <adilger@...ger.ca>
---
 debugfs/debugfs.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/debugfs/debugfs.c b/debugfs/debugfs.c
index 1703aba..1184596 100644
--- a/debugfs/debugfs.c
+++ b/debugfs/debugfs.c
@@ -1719,6 +1719,8 @@ void do_write(int argc, char *argv[])
 		current_fs->now ? current_fs->now : time(0);
 	inode.i_links_count = 1;
 	inode.i_size = statbuf.st_size;
+	/* cast to (long long) to avoid shift warning if st_size is 32 bits */
+	inode.i_size_high = (long long)statbuf.st_size >> 32;
 	if (current_fs->super->s_feature_incompat &
 	    EXT3_FEATURE_INCOMPAT_EXTENTS) {
 		int i;
-- 
1.7.3.4

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