Hello,
in following three patches is implemented recursive mtime feature for
ext3. The first two patches are mostly clean-up patches, the third patch
implements the feature itself. If somebody is interested in testing this
(or even writing a support of this feature in rsync and similar), please
contact me. Attached are sources of simple tools set_recmod, get_recmod
for testing the feature and also a patch implementing basic support of
the feature in e2fsprogs. Comments welcome.
Honza
--
Jan Kara <[email protected]>
SUSE Labs, CR
#include <stdio.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>
#include <sys/ioctl.h>
#include <linux/fs.h>
#include <linux/ext2_fs.h>
#define EXT2_IOC_GETRTIME _IOR('f', 9, unsigned int)
#define S_RECMOD 0x100000
int main(int argc, char **argv)
{
int fd;
long flags;
if (argc < 2)
return 1;
fd = open(argv[1], O_RDONLY);
if (fd < 0) {
printf("Cannot open: %m\n");
return 1;
}
if (ioctl(fd, EXT2_IOC_GETFLAGS, &flags) < 0) {
printf("Cannot get flags: %m\n");
return 1;
}
flags |= S_RECMOD;
if (ioctl(fd, EXT2_IOC_SETFLAGS, &flags) < 0) {
printf("Cannot set flags: %m\n");
return 1;
}
return 0;
}
#include <stdio.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>
#include <sys/ioctl.h>
#include <linux/fs.h>
#include <linux/ext2_fs.h>
#define EXT2_IOC_GETRTIME _IOR('f', 9, unsigned int)
#define S_RECMOD 0x100000
int main(int argc, char **argv)
{
int fd;
long flags;
unsigned time;
if (argc < 2)
return 1;
fd = open(argv[1], O_RDONLY);
if (fd < 0) {
printf("Cannot open: %m\n");
return 1;
}
if (ioctl(fd, EXT2_IOC_GETFLAGS, &flags) < 0) {
printf("Cannot get flags: %m\n");
return 1;
}
if (ioctl(fd, EXT2_IOC_GETRTIME, &time) < 0) {
printf("Cannot get rtime: %s\n", strerror(errno));
return 1;
}
printf("RECMOD flags: %d, time %u\n", !!(flags & S_RECMOD), time);
return 0;
}
diff --git a/lib/e2p/feature.c b/lib/e2p/feature.c
index fe7e65a..a12540b 100644
--- a/lib/e2p/feature.c
+++ b/lib/e2p/feature.c
@@ -37,6 +37,8 @@ static struct feature feature_list[] = {
"resize_inode" },
{ E2P_FEATURE_COMPAT, EXT2_FEATURE_COMPAT_LAZY_BG,
"lazy_bg" },
+ { E2P_FEATURE_COMPAT, EXT2_FEATURE_COMPAT_RTIME,
+ "recursive_mtime" },
{ E2P_FEATURE_RO_INCOMPAT, EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER,
"sparse_super" },
diff --git a/lib/ext2fs/ext2_fs.h b/lib/ext2fs/ext2_fs.h
index a316665..21747c2 100644
--- a/lib/ext2fs/ext2_fs.h
+++ b/lib/ext2fs/ext2_fs.h
@@ -623,6 +623,7 @@ struct ext2_super_block {
#define EXT2_FEATURE_COMPAT_RESIZE_INODE 0x0010
#define EXT2_FEATURE_COMPAT_DIR_INDEX 0x0020
#define EXT2_FEATURE_COMPAT_LAZY_BG 0x0040
+#define EXT2_FEATURE_COMPAT_RTIME 0x0080
#define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
#define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
diff --git a/lib/ext2fs/ext2fs.h b/lib/ext2fs/ext2fs.h
index 83a9091..64b6eb6 100644
--- a/lib/ext2fs/ext2fs.h
+++ b/lib/ext2fs/ext2fs.h
@@ -418,7 +418,8 @@ typedef struct ext2_icount *ext2_icount_
EXT2_FEATURE_COMPAT_RESIZE_INODE|\
EXT2_FEATURE_COMPAT_DIR_INDEX|\
EXT2_FEATURE_COMPAT_LAZY_BG|\
- EXT2_FEATURE_COMPAT_EXT_ATTR)
+ EXT2_FEATURE_COMPAT_EXT_ATTR|\
+ EXT2_FEATURE_COMPAT_RTIME)
/* This #ifdef is temporary until compression is fully supported */
#ifdef ENABLE_COMPRESSION
diff --git a/misc/mke2fs.c b/misc/mke2fs.c
index 4a6cace..5060db7 100644
--- a/misc/mke2fs.c
+++ b/misc/mke2fs.c
@@ -870,7 +870,8 @@ static __u32 ok_features[3] = {
EXT3_FEATURE_COMPAT_HAS_JOURNAL |
EXT2_FEATURE_COMPAT_RESIZE_INODE |
EXT2_FEATURE_COMPAT_DIR_INDEX |
- EXT2_FEATURE_COMPAT_LAZY_BG, /* Compat */
+ EXT2_FEATURE_COMPAT_LAZY_BG |
+ EXT2_FEATURE_COMPAT_RTIME, /* Compat */
EXT2_FEATURE_INCOMPAT_FILETYPE| /* Incompat */
EXT3_FEATURE_INCOMPAT_JOURNAL_DEV|
EXT2_FEATURE_INCOMPAT_META_BG,
diff --git a/misc/tune2fs.c b/misc/tune2fs.c
index 833b994..5195e40 100644
--- a/misc/tune2fs.c
+++ b/misc/tune2fs.c
@@ -96,7 +96,8 @@ static void usage(void)
static __u32 ok_features[3] = {
EXT3_FEATURE_COMPAT_HAS_JOURNAL |
- EXT2_FEATURE_COMPAT_DIR_INDEX, /* Compat */
+ EXT2_FEATURE_COMPAT_DIR_INDEX |
+ EXT2_FEATURE_COMPAT_RTIME, /* Compat */
EXT2_FEATURE_INCOMPAT_FILETYPE, /* Incompat */
EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER /* R/O compat */
};
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