Author: des
Date: Mon Apr 29 20:13:09 2013
New Revision: 250056
URL: http://svnweb.freebsd.org/changeset/base/250056
Log:
Add a -Z option which zeroes unused blocks. It can be combined with -E,
in which case unused blocks are first zeroed and then erased.
Reviewed by: mckusick
MFC after: 3 weeks
Modified:
head/sbin/fsck_ffs/fsck.h
head/sbin/fsck_ffs/fsck_ffs.8
head/sbin/fsck_ffs/fsutil.c
head/sbin/fsck_ffs/main.c
head/sbin/fsck_ffs/pass5.c
Modified: head/sbin/fsck_ffs/fsck.h
==============================================================================
--- head/sbin/fsck_ffs/fsck.h Mon Apr 29 20:09:44 2013 (r250055)
+++ head/sbin/fsck_ffs/fsck.h Mon Apr 29 20:13:09 2013 (r250056)
@@ -74,6 +74,7 @@
#define MINBUFS 10 /* minimum number of buffers required */
#define MAXBUFS 40 /* maximum space to allocate to buffers
*/
#define INOBUFSIZE 64*1024 /* size of buffer to read inodes in
pass1 */
+#define ZEROBUFSIZE (dev_bsize * 128) /* size of zero buffer used
by -Z */
union dinode {
struct ufs1_dinode dp1;
@@ -306,7 +307,8 @@ char yflag; /* assume a yes
response *
int bkgrdflag; /* use a snapshot to run on an active system */
int bflag; /* location of alternate super block */
int debug; /* output debugging info */
-int Eflag; /* zero out empty data blocks */
+int Eflag; /* delete empty data blocks */
+int Zflag; /* zero empty data blocks */
int inoopt; /* trim out unused inodes */
char ckclean; /* only do work if not cleanly unmounted */
int cvtlevel; /* convert to newer file system format */
@@ -402,6 +404,7 @@ int blread(int fd, char *buf, ufs2_dadd
void bufinit(void);
void blwrite(int fd, char *buf, ufs2_daddr_t blk, ssize_t size);
void blerase(int fd, ufs2_daddr_t blk, long size);
+void blzero(int fd, ufs2_daddr_t blk, long size);
void cacheino(union dinode *dp, ino_t inumber);
void catch(int);
void catchquit(int);
Modified: head/sbin/fsck_ffs/fsck_ffs.8
==============================================================================
--- head/sbin/fsck_ffs/fsck_ffs.8 Mon Apr 29 20:09:44 2013
(r250055)
+++ head/sbin/fsck_ffs/fsck_ffs.8 Mon Apr 29 20:13:09 2013
(r250056)
@@ -38,7 +38,7 @@
.Nd file system consistency check and interactive repair
.Sh SYNOPSIS
.Nm
-.Op Fl BEFfnpry
+.Op Fl BEFfnpryZ
.Op Fl b Ar block
.Op Fl c Ar level
.Op Fl m Ar mode
@@ -280,6 +280,15 @@ Assume a yes response to all questions a
.Nm ;
this should be used with great caution as this is a free license
to continue after essentially unlimited trouble has been encountered.
+.It Fl Z
+Similar to
+.Fl E ,
+but overwrites unused blocks with zeroes.
+If both
+.Fl E
+and
+.Fl Z
+are specified, blocks are first zeroed and then erased.
.El
.Pp
Inconsistencies checked are as follows:
Modified: head/sbin/fsck_ffs/fsutil.c
==============================================================================
--- head/sbin/fsck_ffs/fsutil.c Mon Apr 29 20:09:44 2013 (r250055)
+++ head/sbin/fsck_ffs/fsutil.c Mon Apr 29 20:13:09 2013 (r250056)
@@ -618,6 +618,35 @@ blerase(int fd, ufs2_daddr_t blk, long s
return;
}
+void
+blzero(int fd, ufs2_daddr_t blk, long size)
+{
+ static char *zero;
+ off_t offset, len;
+
+ if (fd < 0)
+ return;
+ len = ZEROBUFSIZE;
+ if (zero == NULL) {
+ zero = calloc(len, 1);
+ if (zero == NULL)
+ errx(EEXIT, "cannot allocate buffer pool");
+ }
+ offset = blk * dev_bsize;
+ if (lseek(fd, offset, 0) < 0)
+ rwerror("SEEK BLK", blk);
+ while (size > 0) {
+ if (size > len)
+ size = len;
+ else
+ len = size;
+ if (write(fd, zero, len) != len)
+ rwerror("WRITE BLK", blk);
+ blk += len / dev_bsize;
+ size -= len;
+ }
+}
+
/*
* Verify cylinder group's magic number and other parameters. If the
* test fails, offer an option to rebuild the whole cylinder group.
Modified: head/sbin/fsck_ffs/main.c
==============================================================================
--- head/sbin/fsck_ffs/main.c Mon Apr 29 20:09:44 2013 (r250055)
+++ head/sbin/fsck_ffs/main.c Mon Apr 29 20:13:09 2013 (r250056)
@@ -82,7 +82,7 @@ main(int argc, char *argv[])
sync();
skipclean = 1;
inoopt = 0;
- while ((ch = getopt(argc, argv, "b:Bc:CdEfFm:npry")) != -1) {
+ while ((ch = getopt(argc, argv, "b:Bc:CdEfFm:npryZ")) != -1) {
switch (ch) {
case 'b':
skipclean = 0;
@@ -147,6 +147,10 @@ main(int argc, char *argv[])
nflag = 0;
break;
+ case 'Z':
+ Zflag++;
+ break;
+
default:
usage();
}
Modified: head/sbin/fsck_ffs/pass5.c
==============================================================================
--- head/sbin/fsck_ffs/pass5.c Mon Apr 29 20:09:44 2013 (r250055)
+++ head/sbin/fsck_ffs/pass5.c Mon Apr 29 20:13:09 2013 (r250056)
@@ -252,7 +252,7 @@ pass5(void)
frags = 0;
for (j = 0; j < fs->fs_frag; j++) {
if (testbmap(d + j)) {
- if (Eflag && start != -1) {
+ if ((Eflag || Zflag) && start != -1) {
clear_blocks(start, d + j - 1);
start = -1;
}
@@ -274,7 +274,7 @@ pass5(void)
ffs_fragacct(fs, blk, newcg->cg_frsum, 1);
}
}
- if (Eflag && start != -1)
+ if ((Eflag || Zflag) && start != -1)
clear_blocks(start, d - 1);
if (fs->fs_contigsumsize > 0) {
int32_t *sump = cg_clustersum(newcg);
@@ -586,6 +586,10 @@ static void clear_blocks(ufs2_daddr_t st
if (debug)
printf("Zero frags %jd to %jd\n", start, end);
- blerase(fswritefd, fsbtodb(&sblock, start),
- lfragtosize(&sblock, end - start + 1));
+ if (Zflag)
+ blzero(fswritefd, fsbtodb(&sblock, start),
+ lfragtosize(&sblock, end - start + 1));
+ if (Eflag)
+ blerase(fswritefd, fsbtodb(&sblock, start),
+ lfragtosize(&sblock, end - start + 1));
}
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