diff options
| -rw-r--r-- | README | 11 | ||||
| -rw-r--r-- | deadshred.1 | 27 | ||||
| -rw-r--r-- | deadshred.c | 4 |
3 files changed, 38 insertions, 4 deletions
@@ -2,7 +2,8 @@ NAME deadshred - override the contents of a device that may be broken SYNOPSIS - deadshred [-o offset] [-l length | -e postend] device [< random-source] + deadshred [-b blocksize] [-o offset] [-l length | -e postend] + [-r] device [< random-source] DESCRIPTION The deadshred utility fills a file or block devices with @@ -14,6 +15,10 @@ DESCRIPTION OPTIONS The following options are supported: + -b blocksize + Selects the initial block-size for writing on the + first pass over the device. + -e postend Position in the device to stop writing at. The byte indexed by the value postend will not be overwritten. @@ -27,6 +32,10 @@ OPTIONS -o offset The index of the first byte in the device to overwrite. + -r + Start writing from the end instead of from the + beginning on the first pass over the device. + OPERANDS The following operand is supported: diff --git a/deadshred.1 b/deadshred.1 index 5c3eb63..e445c05 100644 --- a/deadshred.1 +++ b/deadshred.1 @@ -4,6 +4,8 @@ deadshred \- override the contents of a device that may be broken .SH SYNOPSIS .B deadshred +[-b +.IR blocksize ] [-o .IR offset ] [-l @@ -11,6 +13,7 @@ deadshred \- override the contents of a device that may be broken | -e .IR postend ] +[-r] .I device [< .IR random-source ] @@ -29,6 +32,10 @@ to override and retries it later. .SH OPTIONS The following options are supported: .TP +.BR -b \ \fIblocksize\fP +Selects the initial block-size for writing on the +first pass over the device. +.TP .BR -e \ \fIpostend\fP Position in the .I device @@ -56,9 +63,13 @@ bytes past The index of the first byte in the .I device to overwrite. +.TP +.B -r +Start writing from the end instead of from the +beginning on the first pass over the device. .PP The value of the -.B -elo +.B -belo flags can be expressed a sum of terms (delimited by SP .RB (' " " '), @@ -95,6 +106,20 @@ Unless the standard input is a terminal device, it shall be an unless source of either random data or a particular byte to fill the device with. +.SH STDOUT +If the process is terminated using either of the signals +SIGTERM or SIGINT, the process will write to standard output +a map of sections that has not been overwritten yet. The +output will be the concatenation of one string per section, +each on the format +.PP +.nf +\fB\(dq%s%x-%x/%x\(dq,\fP <\fB\(dq0x\(dq\fP for the first section, \fB\(dq,\(dq\fP otherwise>\fB,\fP + <\fIindex of the first byte in the section\fP>\fB,\fP + <\fIindex of the byte after the last in the section\fP>\fB,\fP + <\fIthe block size that should be used when trying to overwrite\fP> +.fi + .SH NOTES While the .B deadshred diff --git a/deadshred.c b/deadshred.c index c471982..d7f2f5f 100644 --- a/deadshred.c +++ b/deadshred.c @@ -4,7 +4,6 @@ USAGE("[-b blocksize] [-o offset] [-l length | -e postend] [-r] device [< random-source]"); -/* TODO document (also in README and man pages) options -b and -r */ struct status status = STATUS_INIT; @@ -417,6 +416,8 @@ main(int argc, char *argv[]) close(fd); return 0; } + while ((off_t)spans[0].blocksize >> 1 > total_size) + spans[0].blocksize >>= 1; humansize1000(total_size, total_size_1000); humansize1024(total_size, total_size_1024); @@ -473,7 +474,6 @@ main(int argc, char *argv[]) print_status(1, &status); if (nspans) { - /* TODO document in man page */ dump_map(STDOUT_FILENO, "<stdout>"); if (close(STDOUT_FILENO)) eprintf("write <stdout>"); |