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src/e4compact: add sparse file optimization

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Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org>
Signed-off-by: Dave Chinner <david@fromorbit.com>
This commit is contained in:
Dmitry Monakhov
2014-09-08 20:49:52 +10:00
committed by Dave Chinner
parent 8c0fe784db
commit c4b1218f87
1 changed files with 76 additions and 10 deletions
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src/e4compact.c
+76 -10
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@@ -16,6 +16,8 @@
#include <ctype.h>
#include <limits.h>
#include <errno.h>
#include <linux/fs.h>
#include <linux/fiemap.h>
#include <linux/types.h>
#include <fcntl.h>
#include <sys/ioctl.h>
@@ -40,6 +42,7 @@ struct move_extent {
#define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent)
#endif
#define EXTENT_MAX_COUNT 512
struct donor_info
{
@@ -50,11 +53,12 @@ struct donor_info
static int ignore_error = 0;
static int verbose = 0;
static int do_sparse = 0;
static unsigned blk_per_pg;
static unsigned blk_sz;
static int do_defrag_one(int fd, char *name,__u64 start, __u64 len, struct donor_info *donor)
static int do_defrag_range(int fd, char *name,__u64 start, __u64 len,
struct donor_info *donor)
{
int ret, retry;
struct move_extent mv_ioc;
@@ -119,10 +123,64 @@ static int do_defrag_one(int fd, char *name,__u64 start, __u64 len, struct donor
return ret;
}
static int do_defrag_sparse(int fd, char *name,__u64 start, __u64 len,
struct donor_info *donor)
{
int i, ret = 0;
struct fiemap *fiemap_buf = NULL;
struct fiemap_extent *ext_buf = NULL;
fiemap_buf = malloc(EXTENT_MAX_COUNT * sizeof(struct fiemap_extent)
+ sizeof(struct fiemap));
if (fiemap_buf == NULL) {
fprintf(stderr, "%s Can not allocate memory\n", __func__);
return -1;
}
ext_buf = fiemap_buf->fm_extents;
memset(fiemap_buf, 0, sizeof(struct fiemap));
fiemap_buf->fm_flags |= FIEMAP_FLAG_SYNC;
fiemap_buf->fm_extent_count = EXTENT_MAX_COUNT;
do {
__u64 next;
fiemap_buf->fm_start = start * blk_sz;
fiemap_buf->fm_length = len * blk_sz;
ret = ioctl(fd, FS_IOC_FIEMAP, fiemap_buf);
if (ret < 0 || fiemap_buf->fm_mapped_extents == 0) {
fprintf(stderr, "%s Can get extent info for %s ret:%d mapped:%d",
__func__, name, ret, fiemap_buf->fm_mapped_extents);
goto out;
}
for (i = 0; i < fiemap_buf->fm_mapped_extents; i++) {
ret = do_defrag_range(fd, name,
ext_buf[i].fe_logical / blk_sz,
ext_buf[i].fe_length / blk_sz,
donor);
if (ret)
goto out;
}
next = (ext_buf[fiemap_buf->fm_mapped_extents -1].fe_logical +
ext_buf[fiemap_buf->fm_mapped_extents -1].fe_length) /
blk_sz;
if (next < start + len) {
len -= next - start;
start = next;
} else
break;
} while (fiemap_buf->fm_mapped_extents == EXTENT_MAX_COUNT &&
!(ext_buf[EXTENT_MAX_COUNT-1].fe_flags & FIEMAP_EXTENT_LAST));
out:
free(fiemap_buf);
return ret;
}
void usage()
{
printf("Usage: -f donor_file [-o donor_offset] [-v] [-i]\n"
"\t\t -v: verbose\n"
"\t\t -s: enable sparse file optimization\n"
"\t\t -i: ignore errors\n");
}
@@ -138,9 +196,10 @@ int main(int argc, char **argv)
extern int optind;
int c;
char * donor_name = NULL;
__u64 eof_blk;
donor.offset = 0;
while ((c = getopt(argc, argv, "f:o:iv")) != -1) {
while ((c = getopt(argc, argv, "f:o:isv")) != -1) {
switch (c) {
case 'o':
donor.offset = atol(optarg);
@@ -151,6 +210,9 @@ int main(int argc, char **argv)
case 'v':
verbose = 1;
break;
case 's':
do_sparse = 1;
break;
case 'f':
donor_name = (optarg);
break;
@@ -207,13 +269,17 @@ int main(int argc, char **argv)
break;
}
if (st.st_size && st.st_blocks) {
ret = do_defrag_one(fd, line, 0,
(st.st_size + blk_sz-1)/ blk_sz,
&donor);
if (ret && !ignore_error)
break;
}
if (!(st.st_size && st.st_blocks))
continue;
eof_blk = (st.st_size + blk_sz-1) / blk_sz;
if (do_sparse)
ret = do_defrag_sparse(fd, line, 0, eof_blk, &donor);
else
ret = do_defrag_range(fd, line, 0, eof_blk, &donor);
if (ret && !ignore_error)
break;
}
free(line);
return ret;