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e2fsprogs: Add undo I/O manager.

RFC PATCH New Aneesh Kumar K.V 1 participant 1 message May 22, 2007

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Aneesh Kumar K.V

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RFC PATCH 1/1 e2fsprogs: Add undo I/O manager.

This I/O manager saves the contents of the location being overwritten to a tdb database. This helps in undoing the changes done to the file system.

The call sequence involve

set_undo_io_backing_manager(unix_io_manager);
set_undo_io_backup_file("/tmp/test.tdb");
retval = ext2fs_open2(dev_name, 0, flags,

			superblock, block_size, undo_io_manager,
			&current_fs);
Signed-off-by Aneesh Kumar K.V <[email protected]>
---
 lib/ext2fs/Makefile.in |   10 +-
 lib/ext2fs/ext2_io.h   |    5 +
 lib/ext2fs/undo_io.c   |  533 ++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 546 insertions(+), 2 deletions(-)
 create mode 100644 lib/ext2fs/undo_io.c
lib/ext2fs/Makefile.in +8 -2
index 799659e..6b49a13 100644
@@ -66,7 +66,8 @@ OBJS= $(DEBUGFS_LIB_OBJS) $(RESIZE_LIB_OBJS) $(E2IMAGE_LIB_OBJS) \
 	unix_io.o \
 	unlink.o \
 	valid_blk.o \
-	version.o
+	version.o \
+	undo_io.o
 
 SRCS= ext2_err.c \
 	$(srcdir)/alloc.c \

@@ -134,7 +135,8 @@ SRCS= ext2_err.c \
 	$(srcdir)/tst_bitops.c \
 	$(srcdir)/tst_byteswap.c \
 	$(srcdir)/tst_getsize.c \
-	$(srcdir)/tst_iscan.c
+	$(srcdir)/tst_iscan.c \
+	$(srcdir)/undo_io.c
 
 HFILES= bitops.h ext2fs.h ext2_io.h ext2_fs.h ext2_ext_attr.h ext3_extents.h
 HFILES_IN=  ext2_err.h ext2_types.h

@@ -550,3 +552,7 @@ tst_iscan.o: $(srcdir)/tst_iscan.c $(srcdir)/ext2_fs.h \
  $(top_builddir)/lib/ext2fs/ext2_types.h $(srcdir)/ext2fs.h \
  $(srcdir)/ext2_fs.h $(top_srcdir)/lib/et/com_err.h $(srcdir)/ext2_io.h \
  $(top_builddir)/lib/ext2fs/ext2_err.h $(srcdir)/bitops.h
+undo_io.o: $(srcdir)/undo_io.c $(srcdir)/ext2_fs.h \
+ $(top_builddir)/lib/ext2fs/ext2_types.h $(srcdir)/ext2fs.h \
+ $(srcdir)/ext2_fs.h $(top_srcdir)/lib/et/com_err.h $(srcdir)/ext2_io.h \
+ $(top_builddir)/lib/ext2fs/ext2_err.h $(srcdir)/bitops.h
lib/ext2fs/ext2_io.h +5 -0
index eada278..476eb4d 100644
@@ -96,6 +96,11 @@ extern errcode_t io_channel_write_byte(io_channel channel,
 /* unix_io.c */
 extern io_manager unix_io_manager;
 
+/* undo_io.c */
+extern io_manager undo_io_manager;
+extern errcode_t set_undo_io_backing_manager(io_manager manager);
+extern errcode_t set_undo_io_backup_file(char *file_name);
+
 /* test_io.c */
 extern io_manager test_io_manager, test_io_backing_manager;
 extern void (*test_io_cb_read_blk)
lib/ext2fs/undo_io.c new file +533 -0

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1.5.2.14.g45bde-dirty