git: 32a4a2680796 - main - Synchronize recoverdisk(1) with the datamuseum.dk version.
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Date: Tue, 22 Jul 2025 19:57:23 UTC
The branch main has been updated by phk:
URL: https://cgit.FreeBSD.org/src/commit/?id=32a4a2680796d2ba234e9fd9766ed695ab1a5909
commit 32a4a2680796d2ba234e9fd9766ed695ab1a5909
Author: Poul-Henning Kamp <phk@FreeBSD.org>
AuthorDate: 2025-07-22 19:54:13 +0000
Commit: Poul-Henning Kamp <phk@FreeBSD.org>
CommitDate: 2025-07-22 19:54:13 +0000
Synchronize recoverdisk(1) with the datamuseum.dk version.
---
sbin/recoverdisk/recoverdisk.1 | 258 +++++++++-----
sbin/recoverdisk/recoverdisk.c | 766 +++++++++++++++++++++++++++--------------
2 files changed, 681 insertions(+), 343 deletions(-)
diff --git a/sbin/recoverdisk/recoverdisk.1 b/sbin/recoverdisk/recoverdisk.1
index 2999ac6ec409..9f1deb4c0c23 100644
--- a/sbin/recoverdisk/recoverdisk.1
+++ b/sbin/recoverdisk/recoverdisk.1
@@ -27,7 +27,7 @@
.Os
.Sh NAME
.Nm recoverdisk
-.Nd recover data from hard disk or optical media
+.Nd recover data from disk-like devices.
.Sh SYNOPSIS
.Nm
.Op Fl b Ar bigsize
@@ -41,79 +41,101 @@
.Sh DESCRIPTION
The
.Nm
-utility reads data from the
+utility reads all data from the
.Ar source
-file until all blocks could be successfully read.
+and retries read operations until they succeed.
If
.Ar destination
-was specified all data is being written to that file.
-It starts reading in multiples of the sector size.
-Whenever a block fails, it is put to the end of the working queue and will be
-read again, possibly with a smaller read size.
+is specified all data read be written there.
.Pp
-By default it uses block sizes of roughly 1 MB, 32kB, and the native
-sector size (usually 512 bytes).
-These figures are adjusted slightly, for devices whose sectorsize is not a
-power of 2, e.g., audio CDs with a sector size of 2352 bytes.
+The internal work-list can be saved and loaded so that
+.Nm
+sessions can be resumed, for instance when a marginal
+source hard-disk shuts down.
+.Pp
+The work-list is initialized with a single item which covers the entire
+.Ar source
+and
+.Nm
+always chips away at the first item on the work-list.
+
+When a read succeeds, that part of the current chunk is eliminated
+from the work-list.
+
+When a read fails, that part of the item is appended to the worklist
+as a separate item, and will be retried in due order.
+If
+.Ar destination
+is specified, the corresponding range is filled with '_UNREAD_'.
+.Pp
+The first pass attempts to read everything in "big-size" chunks,
+the second pass reads in "medium-size" chunks and third and subsequent
+passes read in "small-size" chunks. This three stage process is
+an attempt to optimize the case where only a few bad blocks exist
+on
+.Ar source .
+If too many read-errors are encountered,
+.Nm
+will fall back to smaller sizes sooner.
+.Pp
+The three sizes default to 128kB (or less if the sector size does
+not divide 128kB cleanly, for instance audio CD media), and the
+reported
+.Dv DIOCGSTRIPESIZE
+and
+.Dv DIOCGSECTORSIZE
+respectively.
.Pp
The options are as follows:
.Bl -tag -width indent
.It Fl b Ar bigsize
-The size of reads attempted first.
-The middle pass is roughly the logarithmic average of the bigsize and
-the sectorsize.
-.It Fl r Ar readlist
-Read the list of blocks and block sizes to read from the specified file.
-.It Fl s Ar interval
-How often we should update the writelist file while things go OK.
-The default is 60 and the unit is "progress messages" so if things
-go well, this is the same as once per minute.
+The size of reads attempted in first pass.
+.It Fl m Ar mediumsize
+The size of reads attempted in second pass.
+.It Fl s Ar smallsize
+The size of reads attempted in third and subsequent passes.
+.It Fl r Ar work-list-file
+Read the work-list from a file.
+.It Fl w Ar work-list-file
+Write the work-list to a file when a read succeed, but at most once
+every minute.
+.It Fl l Ar log-file
+Each successful read is logged with timestamp, offset and length.
+.It Fl t Ar totalsize
+How many bytes should be recovered. The default is what
+.Dv DIOCGMEDIASIZE
+reports for character and block devices or
+.Dv st_size
+if
+.Ar source
+is a regular file.
+.It Fl p Ar pause
+.Xr sleep 3
+this long whenever a read fails. This makes the
+.Ar source
+device look less sick to the operating system.
.It Fl u Ar pattern
-By default blocks which encounter read errors will be filled with
-the pattern
+By default blocks which cannot be read are filled with the pattern
.Ql _UNREAD_
-in the output file.
-This option can be
-used to specify another pattern.
-Nothing gets written if the string is empty.
+in the output file. This option can be used to specify a different
+pattern. If the pattern is the empty string, nothing is written.
.It Fl v
-Enables nicer status report using ANSI escapes and UTF-8.
-.It Fl w Ar writelist
-Write the list of remaining blocks to read to the specified file if
-.Nm
-is aborted via
-.Dv SIGINT .
+Produce a detailed progress report with ANSI escapes and UTF-8.
.El
.Pp
-The
-.Fl r
-and
-.Fl w
-options can be specified together.
-Especially, they can point to the same file, which will be updated on abort.
-.Sh OUTPUT
-The
.Nm
-utility
-prints several columns, detailing the progress
-.Bl -tag -width remaining
-.It Va start
-Starting offset of the current block.
-.It Va size
-Read size of the current block.
-.It Va len
-Length of the current block.
-.It Va state
-Is increased for every failed read.
-.It Va done
-Number of bytes already read.
-.It Va remaining
-Number of bytes remaining.
-.It Va "% done"
-Percent complete.
-.El
+can be aborted with
+.Dv SIGINT ,
+but with a sick
+.Ar source
+it may take up to several minutes before the current read operation
+returns from the kernel.
+.Pp
.Sh EXAMPLES
.Bd -literal
+# check if all sectors can be read on a USB stick:
+recoverdisk /dev/da0
+
# recover data from failing hard drive ada3
recoverdisk /dev/ada3 /data/disk.img
@@ -129,10 +151,72 @@ recoverdisk -r worklist -w worklist /dev/cd0 /data/cd.iso
# recover a single file from the unreadable media
recoverdisk /cdrom/file.avi file.avi
-# If the disk hangs the system on read-errors try:
-recoverdisk -b 0 /dev/ada3 /somewhere
-
.Ed
+.Sh PRACTICAL ADVICE
+In Datamuseum.dk
+.Nm
+has been used to recover all sorts of data-media for two decades,
+here are some things we have learned:
+.Bl -bullet
+.It
+Interacting with failing hardware has a tendency to crash machines,
+so it is always a good idea to use the
+.Fl -w work-list-file
+so that it is possible to continue.
+.It
+When attempting to recover hard to read data from failing hard disks,
+it pays to pamper the drive as much as possible:
+.It
+It is generally best to keep the drive in it's usual physical orientation,
+but it can also help to try other orientations.
+.It
+Insulate the drive from external vibrations.
+.It
+Keep the drive cool with a fan.
+.It
+If possible, power the drive from a laboratory power supply.
+.It
+Do not loose patience: Let
+.Nm
+run as long as possible.
+.It
+(S)ATA controllers do not handle failing disks well, if this
+is a problem, use a USB-(S)ATA adapter instead.
+.It
+The
+.Nm
+source code is deliberately written to be easily portable to
+older versions of
+.Fx
+and to other operating systems.
+.It
+If you need to read ST-506, RLL or ESDI drives
+.Fx 3.5.1
+is a good compromise.
+.It
+Sometimes forcing the disk to step between reads helps.
+Since
+.Nm
+process the work-list in the order it is read, this
+can be accomplished by sorting the work-list with
+something like:
+.Dl % sort +0.5
+.It
+By default the
+.Xr CAM
+layer will retry failing read operations, but that
+will get stuck on the bad sectors for long time
+and delay recovering what actually can be read from
+a rapidly failing drive.
+In that situation, set the appropriate
+.Dl kern.cam.*.retry_count
+sysctl to zero.
+.It
+For floppies and un-zoned hard disks (ST-506 to
+early IDE) set
+.Fl b Ar bigsize
+to the size of a track.
+.El
.Sh SEE ALSO
.Xr dd 1 ,
.Xr ada 4 ,
@@ -143,7 +227,8 @@ recoverdisk -b 0 /dev/ada3 /somewhere
The
.Nm
utility first appeared in
-.Fx 7.0 .
+.Fx 7.0
+because Somebody™ forgot to make a backup copy.
.Sh AUTHORS
.An -nosplit
The original implementation was done by
@@ -151,34 +236,29 @@ The original implementation was done by
with minor improvements from
.An Ulrich Sp\(:orlein Aq Mt uqs@FreeBSD.org .
.Pp
-This manual page was written by
+This manual page was originally written by
.An Ulrich Sp\(:orlein .
.Sh BUGS
-Reading from media where the sectorsize is not a power of 2 will make all
-1 MB reads fail.
-This is due to the DMA reads being split up into blocks of at most 128kB.
-These reads then fail if the sectorsize is not a divisor of 128kB.
-When reading a full raw audio CD, this leads to roughly 700 error messages
-flying by.
-This is harmless and can be avoided by setting
-.Fl b
-to no more than 128kB.
+If a failing device causes the machine to crash, there is
+a risk that a chunk might have been successfully read
+and removed from the work-list, but not yet flushed to
+the
+.Ar destination .
.Pp
.Nm
-needs to know about read errors as fast as possible, i.e., retries by lower
-layers will usually slow down the operation.
-When using
-.Xr cam 4
-attached drives, you may want to set kern.cam.XX.retry_count to zero, e.g.:
-.Bd -literal
-# sysctl kern.cam.ada.retry_count=0
-# sysctl kern.cam.cd.retry_count=0
-# sysctl kern.cam.da.retry_count=0
-.Ed
-.\".Pp
-.\"When reading from optical media, a bug in the GEOM framework will
-.\"prevent it from seeing that the media has been removed.
-.\"The device can still be opened, but all reads will fail.
-.\"This is usually harmless, but will send
-.\".Nm
-.\"into an infinite loop.
+calls
+.Xr fdatasync 3
+on the destination before writing the work-list to a
+temporary file, and calls it again on the temporary
+file before renaming it to the specified
+.Fl w Ar work-file-list
+filename.
+But even then things dont always work out.
+.Pp
+.Nm
+should have an option for reconstructing the work-list
+from the
+.Ar destination
+by enumerating the
+.Fl u Ar pattern
+filled ranges.
diff --git a/sbin/recoverdisk/recoverdisk.c b/sbin/recoverdisk/recoverdisk.c
index 446266c36d50..e1b283e54a93 100644
--- a/sbin/recoverdisk/recoverdisk.c
+++ b/sbin/recoverdisk/recoverdisk.c
@@ -8,6 +8,7 @@
* this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
* ----------------------------------------------------------------------------
*/
+
#include <sys/param.h>
#include <sys/queue.h>
#include <sys/disk.h>
@@ -27,18 +28,10 @@
#include <time.h>
#include <unistd.h>
-/* Safe printf into a fixed-size buffer */
-#define bprintf(buf, fmt, ...) \
- do { \
- int ibprintf; \
- ibprintf = snprintf(buf, sizeof buf, fmt, __VA_ARGS__); \
- assert(ibprintf >= 0 && ibprintf < (int)sizeof buf); \
- } while (0)
-
struct lump {
- off_t start;
- off_t len;
- int state;
+ uint64_t start;
+ uint64_t len;
+ unsigned pass;
TAILQ_ENTRY(lump) list;
};
@@ -46,25 +39,32 @@ struct period {
time_t t0;
time_t t1;
char str[20];
- off_t bytes_read;
+ uint64_t bytes_read;
TAILQ_ENTRY(period) list;
};
TAILQ_HEAD(period_head, period);
static volatile sig_atomic_t aborting = 0;
static int verbose = 0;
-static size_t bigsize = 1024 * 1024;
-static size_t medsize;
-static size_t minsize = 512;
-static off_t tot_size;
-static off_t done_size;
+static uint64_t big_read;
+static uint64_t medium_read;
+static uint64_t small_read;
+static uint64_t total_size;
+static uint64_t done_size;
static char *input;
-static char *wworklist = NULL;
-static char *rworklist = NULL;
+static char *write_worklist_file = NULL;
+static char *read_worklist_file = NULL;
static const char *unreadable_pattern = "_UNREAD_";
-static const int write_errors_are_fatal = 1;
-static int fdr, fdw;
-
+static int write_errors_are_fatal = 1;
+static int read_fd, write_fd;
+static FILE *log_file = NULL;
+static char *work_buf;
+static char *pattern_buf;
+static double error_pause;
+
+static unsigned nlumps;
+static double n_reads, n_good_reads;
+static time_t t_first;
static TAILQ_HEAD(, lump) lumps = TAILQ_HEAD_INITIALIZER(lumps);
static struct period_head minute = TAILQ_HEAD_INITIALIZER(minute);
static struct period_head quarter = TAILQ_HEAD_INITIALIZER(quarter);
@@ -74,7 +74,8 @@ static struct period_head day = TAILQ_HEAD_INITIALIZER(quarter);
/**********************************************************************/
static void
-report_good_read2(time_t now, size_t bytes, struct period_head *ph, time_t dt)
+account_good_read_period(time_t now, uint64_t bytes,
+ struct period_head *ph, time_t dt)
{
struct period *pp;
const char *fmt;
@@ -82,7 +83,7 @@ report_good_read2(time_t now, size_t bytes, struct period_head *ph, time_t dt)
pp = TAILQ_FIRST(ph);
if (pp == NULL || pp->t1 < now) {
- pp = calloc(1, sizeof(*pp));
+ pp = calloc(1UL, sizeof(*pp));
assert(pp != NULL);
pp->t0 = (now / dt) * dt;
pp->t1 = (now / dt + 1) * dt;
@@ -98,13 +99,13 @@ report_good_read2(time_t now, size_t bytes, struct period_head *ph, time_t dt)
}
static void
-report_good_read(time_t now, size_t bytes)
+account_good_read(time_t now, uint64_t bytes)
{
- report_good_read2(now, bytes, &minute, 60L);
- report_good_read2(now, bytes, &quarter, 900L);
- report_good_read2(now, bytes, &hour, 3600L);
- report_good_read2(now, bytes, &day, 86400L);
+ account_good_read_period(now, bytes, &minute, 60L);
+ account_good_read_period(now, bytes, &quarter, 900L);
+ account_good_read_period(now, bytes, &hour, 3600L);
+ account_good_read_period(now, bytes, &day, 86400L);
}
static void
@@ -114,20 +115,18 @@ report_one_period(const char *period, struct period_head *ph)
int n;
n = 0;
- printf("%s \xe2\x94\x82", period);
+ printf("%s ", period);
TAILQ_FOREACH(pp, ph, list) {
- if (n == 3) {
+ if (++n == 4) {
TAILQ_REMOVE(ph, pp, list);
free(pp);
break;
}
- if (n++)
- printf(" \xe2\x94\x82");
- printf(" %s %14jd", pp->str, pp->bytes_read);
+ printf("\xe2\x94\x82 %s %14ju ",
+ pp->str, (uintmax_t)pp->bytes_read);
}
for (; n < 3; n++) {
- printf(" \xe2\x94\x82");
- printf(" %5s %14s", "", "");
+ printf("\xe2\x94\x82 %5s %14s ", "", "");
}
printf("\x1b[K\n");
}
@@ -146,27 +145,23 @@ report_periods(void)
static void
set_verbose(void)
{
- struct winsize wsz;
- if (!isatty(STDIN_FILENO) || ioctl(STDIN_FILENO, TIOCGWINSZ, &wsz))
- return;
verbose = 1;
}
static void
-report_header(int eol)
+report_header(const char *term)
{
- printf("%13s %7s %13s %5s %13s %13s %9s",
+ printf("%13s %7s %13s %5s %13s %13s %9s%s",
"start",
"size",
"block-len",
"pass",
"done",
"remaining",
- "% done");
- if (eol)
- printf("\x1b[K");
- putchar('\n');
+ "% done",
+ term
+ );
}
#define REPORTWID 79
@@ -186,20 +181,20 @@ report_hline(const char *how)
printf("\x1b[K\n");
}
-static off_t hist[REPORTWID];
-static off_t last_done = -1;
+static uint64_t hist[REPORTWID];
+static uint64_t prev_done = ~0UL;
static void
-report_histogram(const struct lump *lp)
+report_histogram(uint64_t start)
{
- off_t j, bucket, fp, fe, k, now;
+ uint64_t j, bucket, fp, fe, k, now;
double a;
struct lump *lp2;
- bucket = tot_size / REPORTWID;
- if (tot_size > bucket * REPORTWID)
+ bucket = total_size / REPORTWID;
+ if (total_size > bucket * REPORTWID)
bucket += 1;
- if (done_size != last_done) {
+ if (done_size != prev_done) {
memset(hist, 0, sizeof hist);
TAILQ_FOREACH(lp2, &lumps, list) {
fp = lp2->start;
@@ -213,9 +208,9 @@ report_histogram(const struct lump *lp)
fp += k;
}
}
- last_done = done_size;
+ prev_done = done_size;
}
- now = lp->start / bucket;
+ now = start / bucket;
for (j = 0; j < REPORTWID; j++) {
a = round(8 * (double)hist[j] / bucket);
assert (a >= 0 && a < 9);
@@ -228,7 +223,7 @@ report_histogram(const struct lump *lp)
} else {
putchar(0xe2);
putchar(0x96);
- putchar(0x80 + (int)a);
+ putchar(0x80 + (char)a);
}
if (j == now)
printf("\x1b[0m");
@@ -237,34 +232,40 @@ report_histogram(const struct lump *lp)
}
static void
-report(const struct lump *lp, size_t sz)
+report(uint64_t sz)
{
struct winsize wsz;
+ const struct lump *lp = TAILQ_FIRST(&lumps);
int j;
-
- assert(lp != NULL);
+ unsigned pass = 0;
+ uintmax_t start = 0, length = 0;
+ time_t t_now = time(NULL);
+
+ if (lp != NULL) {
+ pass = lp->pass;
+ start = lp->start;
+ length = lp->len;
+ }
if (verbose) {
printf("\x1b[H%s\x1b[K\n", input);
- report_header(1);
- } else {
- putchar('\r');
+ report_header("\x1b[K\n");
}
- printf("%13jd %7zu %13jd %5d %13jd %13jd %9.4f",
- (intmax_t)lp->start,
- sz,
- (intmax_t)lp->len,
- lp->state,
- (intmax_t)done_size,
- (intmax_t)(tot_size - done_size),
- 100*(double)done_size/(double)tot_size
+ printf("%13ju %7ju %13ju %5u %13ju %13ju %9.4f",
+ start,
+ (uintmax_t)sz,
+ length,
+ pass,
+ (uintmax_t)done_size,
+ (uintmax_t)(total_size - done_size),
+ 100*(double)done_size/(double)total_size
);
if (verbose) {
printf("\x1b[K\n");
report_hline(NULL);
- report_histogram(lp);
+ report_histogram(start);
if (TAILQ_EMPTY(&minute)) {
report_hline(NULL);
} else {
@@ -272,27 +273,36 @@ report(const struct lump *lp, size_t sz)
report_periods();
report_hline("\xe2\x94\xb4");
}
+ printf("Missing: %u", nlumps);
+ printf(" Success: %.0f/%.0f =", n_good_reads, n_reads);
+ printf(" %.4f%%", 100 * n_good_reads / n_reads);
+ printf(" Duration: %.3fs", (t_now - t_first) / n_reads);
+ printf("\x1b[K\n");
+ report_hline(NULL);
j = ioctl(STDIN_FILENO, TIOCGWINSZ, &wsz);
if (!j)
printf("\x1b[%d;1H", wsz.ws_row);
+ } else {
+ printf("\n");
}
- fflush(stdout);
}
/**********************************************************************/
static void
-new_lump(off_t start, off_t len, int state)
+new_lump(uint64_t start, uint64_t len, unsigned pass)
{
struct lump *lp;
+ assert(len > 0);
lp = malloc(sizeof *lp);
if (lp == NULL)
err(1, "Malloc failed");
lp->start = start;
lp->len = len;
- lp->state = state;
+ lp->pass = pass;
TAILQ_INSERT_TAIL(&lumps, lp, list);
+ nlumps += 1;
}
/**********************************************************************
@@ -306,98 +316,100 @@ save_worklist(void)
struct lump *llp;
char buf[PATH_MAX];
- if (fdw >= 0 && fdatasync(fdw))
+ if (write_fd >= 0 && fdatasync(write_fd))
err(1, "Write error, probably disk full");
- if (wworklist != NULL) {
- bprintf(buf, "%s.tmp", wworklist);
- (void)fprintf(stderr, "\nSaving worklist ...");
- (void)fflush(stderr);
+ if (write_worklist_file != NULL) {
+ snprintf(buf, sizeof(buf), "%s.tmp", write_worklist_file);
+ fprintf(stderr, "\nSaving worklist ...");
file = fopen(buf, "w");
if (file == NULL)
err(1, "Error opening file %s", buf);
- TAILQ_FOREACH(llp, &lumps, list)
- fprintf(file, "%jd %jd %d\n",
- (intmax_t)llp->start, (intmax_t)llp->len,
- llp->state);
- (void)fflush(file);
+ TAILQ_FOREACH(llp, &lumps, list) {
+ assert (llp->len > 0);
+ fprintf(file, "%ju %ju %u\n",
+ (uintmax_t)llp->start,
+ (uintmax_t)llp->len,
+ llp->pass);
+ }
+ fflush(file);
if (ferror(file) || fdatasync(fileno(file)) || fclose(file))
err(1, "Error writing file %s", buf);
- if (rename(buf, wworklist))
- err(1, "Error renaming %s to %s", buf, wworklist);
- (void)fprintf(stderr, " done.\n");
+ if (rename(buf, write_worklist_file))
+ err(1, "Error renaming %s to %s",
+ buf, write_worklist_file);
+ fprintf(stderr, " done.\n");
}
}
/* Read the worklist if -r was given */
-static off_t
-read_worklist(off_t t)
+static uint64_t
+read_worklist(void)
{
- off_t s, l, d;
- int state, lines;
+ uintmax_t start, length;
+ uint64_t missing = 0;
+ unsigned pass, lines;
FILE *file;
- (void)fprintf(stderr, "Reading worklist ...");
- (void)fflush(stderr);
- file = fopen(rworklist, "r");
+ fprintf(stderr, "Reading worklist ...");
+ file = fopen(read_worklist_file, "r");
if (file == NULL)
- err(1, "Error opening file %s", rworklist);
+ err(1, "Error opening file %s", read_worklist_file);
lines = 0;
- d = t;
for (;;) {
++lines;
- if (3 != fscanf(file, "%jd %jd %d\n", &s, &l, &state)) {
+ if (3 != fscanf(file, "%ju %ju %u\n", &start, &length, &pass)) {
if (!feof(file))
- err(1, "Error parsing file %s at line %d",
- rworklist, lines);
+ err(1, "Error parsing file %s at line %u",
+ read_worklist_file, lines);
else
break;
}
- new_lump(s, l, state);
- d -= l;
+ if (length > 0) {
+ new_lump(start, length, pass);
+ missing += length;
+ }
}
if (fclose(file))
- err(1, "Error closing file %s", rworklist);
- (void)fprintf(stderr, " done.\n");
+ err(1, "Error closing file %s", read_worklist_file);
+ fprintf(stderr, " done.\n");
/*
- * Return the number of bytes already read
- * (at least not in worklist).
+ * Return the number of bytes outstanding
*/
- return (d);
+ return (missing);
}
/**********************************************************************/
static void
-write_buf(int fd, const void *buf, ssize_t len, off_t where)
+write_buf(int fd, const void *buf, uint64_t length, uint64_t where)
{
- ssize_t i;
+ int64_t i;
- i = pwrite(fd, buf, len, where);
- if (i == len)
+ i = pwrite(fd, buf, length, (off_t)where);
+ if (i > 0 && (uint64_t)i == length)
return;
- printf("\nWrite error at %jd/%zu\n\t%s\n",
- where, i, strerror(errno));
+ printf("\nWrite error at %ju/%ju: %jd (%s)\n",
+ (uintmax_t)where,
+ (uintmax_t)length,
+ (intmax_t)i, strerror(errno));
save_worklist();
if (write_errors_are_fatal)
exit(3);
}
static void
-fill_buf(char *buf, ssize_t len, const char *pattern)
+fill_buf(char *buf, int64_t len, const char *pattern)
{
- ssize_t sz = strlen(pattern);
- ssize_t i, j;
+ int64_t sz = strlen(pattern);
+ int64_t i;
for (i = 0; i < len; i += sz) {
- j = len - i;
- if (j > sz)
- j = sz;
- memcpy(buf + i, pattern, j);
+ memcpy(buf + i, pattern, MIN(len - i, sz));
}
}
@@ -406,45 +418,334 @@ fill_buf(char *buf, ssize_t len, const char *pattern)
static void
usage(void)
{
- (void)fprintf(stderr, "usage: recoverdisk [-b bigsize] [-r readlist] "
+ fprintf(stderr, "usage: recoverdisk [-b big_read] [-r readlist] "
"[-s interval] [-w writelist] source [destination]\n");
/* XXX update */
exit(1);
}
static void
-sighandler(__unused int sig)
+sighandler(int sig)
{
+ (void)sig;
aborting = 1;
}
+/**********************************************************************/
+
+static int64_t
+attempt_one_lump(time_t t_now)
+{
+ struct lump *lp;
+ uint64_t sz;
+ int64_t retval;
+ int error;
+
+ lp = TAILQ_FIRST(&lumps);
+ if (lp == NULL)
+ return(0);
+
+ if (lp->pass == 0) {
+ sz = MIN(lp->len, big_read);
+ } else if (lp->pass == 1) {
+ sz = MIN(lp->len, medium_read);
+ } else {
+ sz = MIN(lp->len, small_read);
+ }
+
+ assert(sz != 0);
+
+ n_reads += 1;
+ retval = pread(read_fd, work_buf, sz, lp->start);
+
+#if 0 /* enable this when testing */
+ if (!(random() & 0xf)) {
+ retval = -1;
+ errno = EIO;
+ usleep(20000);
+ } else {
+ usleep(2000);
+ }
+#endif
+
+ error = errno;
+ if (retval > 0) {
+ n_good_reads += 1;
+ sz = retval;
+ done_size += sz;
+ if (write_fd >= 0) {
+ write_buf(write_fd, work_buf, sz, lp->start);
+ }
+ if (log_file != NULL) {
+ fprintf(log_file, "%jd %ju %ju\n",
+ (intmax_t)t_now,
+ (uintmax_t)lp->start,
+ (uintmax_t)sz
+ );
+ fflush(log_file);
+ }
+ } else {
+ printf("%14ju %7ju read error %d: (%s)",
+ (uintmax_t)lp->start,
+ (uintmax_t)sz, error, strerror(error));
+ if (error_pause > 1) {
+ printf(" (Pausing %g s)", error_pause);
+ }
+ printf("\n");
+
+ if (write_fd >= 0 && pattern_buf != NULL) {
+ write_buf(write_fd, pattern_buf, sz, lp->start);
+ }
+ new_lump(lp->start, sz, lp->pass + 1);
+ retval = -sz;
+ }
+ lp->start += sz;
+ lp->len -= sz;
+ if (lp->len == 0) {
+ TAILQ_REMOVE(&lumps, lp, list);
+ nlumps -= 1;
+ free(lp);
+ }
+ errno = error;
+ return (retval);
+}
+
+
+/**********************************************************************/
+
+static void
+determine_total_size(void)
+{
+ struct stat sb;
+ int error;
+
+ if (total_size != 0)
+ return;
+
+ error = fstat(read_fd, &sb);
+ if (error < 0)
+ err(1, "fstat failed");
+
+ if (S_ISBLK(sb.st_mode) || S_ISCHR(sb.st_mode)) {
+#ifdef DIOCGMEDIASIZE
+ off_t mediasize;
+ error = ioctl(read_fd, DIOCGMEDIASIZE, &mediasize);
+ if (error == 0 && mediasize > 0) {
+ total_size = mediasize;
+ printf("# Got total_size from DIOCGMEDIASIZE: %ju\n",
+ (uintmax_t)total_size);
+ return;
+ }
+#endif
+ } else if (S_ISREG(sb.st_mode) && sb.st_size > 0) {
+ total_size = sb.st_size;
+ printf("# Got total_size from stat(2): %ju\n",
+ (uintmax_t)total_size);
+ return;
+ } else {
+ errx(1, "Input must be device or regular file");
+ }
+ fprintf(stderr, "Specify total size with -t option\n");
+ exit(1);
+}
+
+static void
+determine_read_sizes(void)
+{
+ int error;
+ u_int sectorsize;
+ off_t stripesize;
+
+ determine_total_size();
+
+#ifdef DIOCGSECTORSIZE
+ if (small_read == 0) {
+ error = ioctl(read_fd, DIOCGSECTORSIZE, §orsize);
+ if (error >= 0 && sectorsize > 0) {
+ small_read = sectorsize;
+ printf("# Got small_read from DIOCGSECTORSIZE: %ju\n",
+ (uintmax_t)small_read
+ );
+ }
+ }
+#endif
+
+ if (small_read == 0) {
+ printf("Assuming 512 for small_read\n");
+ small_read = 512;
+ }
+
+ if (medium_read && (medium_read % small_read)) {
+ errx(1,
+ "medium_read (%ju) is not a multiple of small_read (%ju)\n",
+ (uintmax_t)medium_read, (uintmax_t)small_read
+ );
+ }
+
+ if (big_read != 0 && (big_read % small_read)) {
+ errx(1,
+ "big_read (%ju) is not a multiple of small_read (%ju)\n",
+ (uintmax_t)big_read, (uintmax_t)small_read
+ );
+ }
+
+#ifdef DIOCGSTRIPESIZE
+ if (medium_read == 0) {
+ error = ioctl(read_fd, DIOCGSTRIPESIZE, &stripesize);
+ if (error < 0 || stripesize < 0) {
+ // nope
+ } else if ((uint64_t)stripesize < small_read) {
+ // nope
+ } else if (stripesize % small_read) {
+ // nope
+ } else if (0 < stripesize && stripesize < (128<<10)) {
+ medium_read = stripesize;
*** 398 LINES SKIPPED ***