libext2fs: ext2fs_dup_handle should deep copy MMP buffers

Submitted by Darrick J. Wong on July 23, 2013, 5:27 a.m.

Details

Message ID 20130723052737.GG5785@blackbox.djwong.org
State Superseded, archived
Headers show

Commit Message

Darrick J. Wong July 23, 2013, 5:27 a.m.
It turns out that resize2fs uses ext2fs_dup_handle to duplicate fs handles.  If
MMP is enabled, this causes both handles to share MMP buffers, which is bad
news when it comes time to free both fs handles.  Change the code to provide
each handle with its own separate copy of the MMP buffer.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
---
 lib/ext2fs/dupfs.c |   25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

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diff --git a/lib/ext2fs/dupfs.c b/lib/ext2fs/dupfs.c
index 64d3124..02721e1 100644
--- a/lib/ext2fs/dupfs.c
+++ b/lib/ext2fs/dupfs.c
@@ -40,6 +40,9 @@  errcode_t ext2fs_dup_handle(ext2_filsys src, ext2_filsys *dest)
 	fs->block_map = 0;
 	fs->badblocks = 0;
 	fs->dblist = 0;
+	fs->mmp_buf = 0;
+	fs->mmp_cmp = 0;
+	fs->mmp_fd = -1;
 
 	io_channel_bumpcount(fs->io);
 	if (fs->icache)
@@ -87,6 +90,28 @@  errcode_t ext2fs_dup_handle(ext2_filsys src, ext2_filsys *dest)
 		if (retval)
 			goto errout;
 	}
+	if (src->mmp_buf) {
+		retval = ext2fs_get_mem(src->blocksize, &fs->mmp_buf);
+		if (retval)
+			goto errout;
+		memcpy(fs->mmp_buf, src->mmp_buf, src->blocksize);
+	}
+	if (src->mmp_fd >= 0) {
+		fs->mmp_fd = dup(src->mmp_fd);
+		if (fs->mmp_fd < 0) {
+			retval = EXT2_ET_MMP_OPEN_DIRECT;
+			goto errout;
+		}
+	}
+	if (src->mmp_cmp) {
+		int align = ext2fs_get_dio_alignment(src->mmp_fd);
+
+		retval = ext2fs_get_memalign(src->blocksize, align,
+					     &fs->mmp_cmp);
+		if (retval)
+			goto errout;
+		memcpy(fs->mmp_cmp, src->mmp_cmp, src->blocksize);
+	}
 	*dest = fs;
 	return 0;
 errout: