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Add conv=fsync flag to dd

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The fsync flag performs an fsync(2) on the output file before closing it.
This will be useful for the ZFS test suite.

Submitted by:	ryan@ixsystems.com
Reviewed by:	jilles@, imp@
MFC after:	1 week
Sponsored by:	iXsystems, Inc.
This commit is contained in:
Matt Macy 2019-09-03 18:35:55 +00:00
parent aef64c62c2
commit ce1b19d8c8
4 changed files with 13 additions and 0 deletions
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1
bin/dd/args.c
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@ -320,6 +320,7 @@ static const struct conv {
{ "ascii", C_ASCII, C_EBCDIC, e2a_POSIX },
{ "block", C_BLOCK, C_UNBLOCK, NULL },
{ "ebcdic", C_EBCDIC, C_ASCII, a2e_POSIX },
{ "fsync", C_FSYNC, 0, NULL },
{ "ibm", C_EBCDIC, C_ASCII, a2ibm_POSIX },
{ "lcase", C_LCASE, C_UCASE, NULL },
{ "noerror", C_NOERROR, 0, NULL },

4
bin/dd/dd.1
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@ -252,6 +252,10 @@ are maps used in historic
and
.No pre- Ns Bx 4.3 reno
systems.
.It Cm fsync
Perform an
.Xr fsync 2
on the output file before closing it.
.It Cm lcase
Transform uppercase characters into lowercase characters.
.It Cm pareven , parnone , parodd , parset

7
bin/dd/dd.c
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@ -164,6 +164,8 @@ setup(void)
errx(1, "files is not supported for non-tape devices");
cap_rights_set(&rights, CAP_FTRUNCATE, CAP_IOCTL, CAP_WRITE);
if (ddflags & C_FSYNC)
cap_rights_set(&rights, CAP_FSYNC);
if (out.name == NULL) {
/* No way to check for read access here. */
out.fd = STDOUT_FILENO;
@ -505,6 +507,11 @@ dd_close(void)
if (ftruncate(out.fd, out.seek_offset) == -1)
err(1, "truncating %s", out.name);
}
if (ddflags & C_FSYNC) {
if (fsync(out.fd) == -1)
err(1, "fsyncing %s", out.name);
}
}
void

1
bin/dd/dd.h
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@ -101,6 +101,7 @@ typedef struct {
#define C_NOXFER 0x10000000
#define C_NOINFO 0x20000000
#define C_PROGRESS 0x40000000
#define C_FSYNC 0x80000000
#define C_PARITY (C_PAREVEN | C_PARODD | C_PARNONE | C_PARSET)