Add the utimes command to provide a way to utilize the futimens C library call. This is the interface to the utimensat system call, which updates the mtime and atime of a file.

Signed-off-by: Deepa Dinamani deepa.kernel@gmail.com --- Changes since v1: * changed error return values * removed redundant roff formatting directive * removed unneeded argument count check

include/input.h | 1 + io/Makefile | 2 +- io/init.c | 1 + io/io.h | 1 + io/utimes.c | 81 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ libxcmd/input.c | 22 +++++++++++++++ man/man8/xfs_io.8 | 11 ++++++++ 7 files changed, 118 insertions(+), 1 deletion(-) create mode 100755 io/utimes.c mode change 100644 => 100755 libxcmd/input.c

diff --git a/include/input.h b/include/input.h index d02170f..221678e 100644 --- a/include/input.h +++ b/include/input.h @@ -48,6 +48,7 @@ extern uid_t uid_from_string(char *user); extern gid_t gid_from_string(char *group); extern prid_t prid_from_string(char *project); extern bool isdigits_only(const char *str); +extern int timespec_from_string(const char *sec, const char *nsec, struct timespec *ts);

#define HAVE_FTW_H 1 /* TODO: configure me */

diff --git a/io/Makefile b/io/Makefile index 62bc03b..392e02a 100644 --- a/io/Makefile +++ b/io/Makefile @@ -11,7 +11,7 @@ HFILES = init.h io.h CFILES = init.c \ attr.c bmap.c file.c freeze.c fsync.c getrusage.c imap.c link.c \ mmap.c open.c parent.c pread.c prealloc.c pwrite.c seek.c shutdown.c \ - sync.c truncate.c reflink.c + sync.c truncate.c reflink.c utimes.c

LLDLIBS = $(LIBXCMD) $(LIBHANDLE) LTDEPENDENCIES = $(LIBXCMD) $(LIBHANDLE) diff --git a/io/init.c b/io/init.c index efe7390..6319aeb 100644 --- a/io/init.c +++ b/io/init.c @@ -85,6 +85,7 @@ init_commands(void) sync_range_init(); truncate_init(); reflink_init(); + utimes_init(); }

static int diff --git a/io/io.h b/io/io.h index 2bc7ac4..fddd7a3 100644 --- a/io/io.h +++ b/io/io.h @@ -113,6 +113,7 @@ extern void seek_init(void); extern void shutdown_init(void); extern void sync_init(void); extern void truncate_init(void); +extern void utimes_init(void);

#ifdef HAVE_FADVISE extern void fadvise_init(void); diff --git a/io/utimes.c b/io/utimes.c new file mode 100755 index 0000000..faf9b8d --- /dev/null +++ b/io/utimes.c @@ -0,0 +1,81 @@ +/* + * Copyright (c) 2016 Deepa Dinamani + * All Rights Reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it would be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include "command.h" +#include "input.h" +#include "init.h" +#include "io.h" + +static cmdinfo_t utimes_cmd; + +static void +utimes_help(void) +{ + printf(_( +"\n" +" Update file atime and mtime of the current file with nansecond precision.\n" +"\n" +" Usage: utimes atime_sec atime_nsec mtime_sec mtime_nsec.\n" +" *_sec: Seconds elapsed since 1970-01-01 00:00:00 UTC.\n" +" *_nsec: Nanoseconds since the corresponding *_sec.\n" +"\n")); +} + +static int +utimes_f( + int argc, + char **argv) +{ + struct timespec t[2]; + int result; + + /* Get the timestamps */ + result = timespec_from_string(argv[1], argv[2], &t[0]); + if (result) { + fprintf(stderr, "Bad value for atime\n"); + return 0; + } + result = timespec_from_string(argv[3], argv[4], &t[1]); + if (result) { + fprintf(stderr, "Bad value for mtime\n"); + return 0; + } + + /* Call futimens to update time. */ + if (futimens(file->fd, t)) { + perror("futimens"); + return 0; + } + + return 0; +} + +void +utimes_init(void) +{ + utimes_cmd.name = "utimes"; + utimes_cmd.cfunc = utimes_f; + utimes_cmd.argmin = 4; + utimes_cmd.argmax = 4; + utimes_cmd.flags = CMD_NOMAP_OK | CMD_FOREIGN_OK; + utimes_cmd.args = _("atime_sec atime_nsec mtime_sec mtime_nsec"); + utimes_cmd.oneline = _("Update file times of the current file"); + utimes_cmd.help = utimes_help; + + add_command(&utimes_cmd); +} diff --git a/libxcmd/input.c b/libxcmd/input.c old mode 100644 new mode 100755 index 5a7dce3..8aeb3b0 --- a/libxcmd/input.c +++ b/libxcmd/input.c @@ -327,6 +327,28 @@ timestr( }

/* + * Convert from a pair of arbitrary user strings into a timespec. + */ + +int +timespec_from_string( + const char * secs, + const char * nsecs, + struct timespec * ts) +{ + char* p; + if (!secs || !nsecs || !ts) + return 1; + ts->tv_sec = strtoull(secs, &p, 0); + if (*p) + return 1; + ts->tv_nsec = strtoull(nsecs, &p, 0); + if (*p) + return 1; + return 0; +} + +/* * Convert from arbitrary user strings into a numeric ID. * If it's all numeric, we convert that inplace, else we do * the name lookup, and return the found identifier. diff --git a/man/man8/xfs_io.8 b/man/man8/xfs_io.8 index 2c56f09..9efb7b2 100644 --- a/man/man8/xfs_io.8 +++ b/man/man8/xfs_io.8 @@ -589,6 +589,16 @@ Copy data into the open file beginning at Copy up to .I length bytes of data. +.RE +.PD +.TP +.BI utimes " atime_sec atime_nsec mtime_sec mtime_nsec" +The utimes command changes the atime and mtime of the current file. +sec uses UNIX timestamp notation and is the seconds elapsed since +1970-01-01 00:00:00 UTC. +nsec is the nanoseconds since the sec. This value needs to be in +the range 0-999999999 with UTIME_NOW and UTIME_OMIT being exceptions. +Each (sec, nsec) pair constitutes a single timestamp value.

.SH MEMORY MAPPED I/O COMMANDS .TP @@ -875,6 +885,7 @@ verbose output will be printed. .BR fstatfs (2), .BR fsync (2), .BR ftruncate (2), +.BR futimens (3), .BR mmap (2), .BR msync (2), .BR open (2),