This patch adds the fragmentation score to the output of filefrag.
The threshold that shows whether a fragment is good or not comes from
"blocksize * 8 - 2048". "blocksize * 8 - 2048" is the maximum number of
contiguous blocks which we can get from empty blockgroup containing some
metadata blocks.
For example, filefrag shows fragmentation score as follows:
# filefrag /mnt/mp1/testfile
/mnt/mp1/testfile: 4 extents found
Fragmentation score: 33 (found a little bit fragmentation)
Signed-off-by: Kazuya Mio <[email protected]>
---
misc/Makefile.in | 4 ++--
misc/filefrag.c | 28 ++++++++++++++++++++++++++++
2 files changed, 30 insertions(+), 2 deletions(-)
diff --git a/misc/Makefile.in b/misc/Makefile.in
index 86ee53f..19eaa43 100644
--- a/misc/Makefile.in
+++ b/misc/Makefile.in
@@ -306,9 +306,9 @@ e2freefrag: $(E2FREEFRAG_OBJS)
$(E) " LD $@"
$(Q) $(CC) $(ALL_LDFLAGS) -o e2freefrag $(E2FREEFRAG_OBJS) $(LIBS)
-filefrag: $(FILEFRAG_OBJS)
+filefrag: $(FILEFRAG_OBJS) $(DEPLIBS_E2P)
$(E) " LD $@"
- $(Q) $(CC) $(ALL_LDFLAGS) -o filefrag $(FILEFRAG_OBJS)
+ $(Q) $(CC) $(ALL_LDFLAGS) -o filefrag $(FILEFRAG_OBJS) $(DEPLIBS_E2P)
filefrag.profiled: $(PROFILED_FILEFRAG_OBJS)
$(E) " LD $@"
diff --git a/misc/filefrag.c b/misc/filefrag.c
index d604b6c..a1fab13 100644
--- a/misc/filefrag.c
+++ b/misc/filefrag.c
@@ -41,6 +41,7 @@ extern int optind;
#include <linux/fd.h>
#include <ext2fs/ext2_types.h>
#include <ext2fs/fiemap.h>
+#include "e2p/e2p.h"
int verbose = 0;
int no_bs = 0; /* Don't use the files blocksize, use 1K blocksize */
@@ -267,6 +268,7 @@ static void frag_report(const char *filename)
int is_ext2 = 0;
static int once = 1;
unsigned int flags;
+ int score;
int rc;
#ifdef HAVE_OPEN64
@@ -367,6 +369,32 @@ static void frag_report(const char *filename)
(expected>1) ? "s" : "");
else
fputc('\n', stdout);
+
+ if (!xattr_map) {
+ /*
+ * Get the fragmentation score.
+ * NOTE: 2048 means the maximum block region of mballoc.
+ */
+ score = get_fragment_score(fd,
+ (fsinfo.f_bsize * 8 - 2048) * fsinfo.f_bsize);
+
+ /*
+ * Print fragmentation score with some comments
+ * 0-30 no problem, 31-55 a little bit fragmented,
+ * 56- needs defrag
+ */
+ if (score < 0)
+ ;
+ else if (score <= 30)
+ printf("Fragmentation score: %d (no problem)\n", score);
+ else if (score <= 55)
+ printf("Fragmentation score: %d "
+ "(found a little bit fragmentation)\n", score);
+ else
+ printf("Fragmentation score: %d "
+ "(need to do e4defrag command)\n", score);
+ }
+
close(fd);
once = 0;
}