xfs_io: implement the fzeroinit command
Add a new command for the new FALLOC_FL_ZEROINIT_RANGE fallocate mode.
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
diff --git a/io/prealloc.c b/io/prealloc.c
index de8fbee..638ec0f 100644
--- a/io/prealloc.c
+++ b/io/prealloc.c
@@ -36,6 +36,10 @@
#define FALLOC_FL_MAP_FREE_SPACE 0x8000
#endif
+#ifndef FALLOC_FL_ZEROINIT_RANGE
+#define FALLOC_FL_ZEROINIT_RANGE 0x80
+#endif
+
static cmdinfo_t allocsp_cmd;
static cmdinfo_t freesp_cmd;
static cmdinfo_t resvsp_cmd;
@@ -49,6 +53,7 @@
static cmdinfo_t fzero_cmd;
static cmdinfo_t funshare_cmd;
static cmdinfo_t fmapfree_cmd;
+static cmdinfo_t fzeroinit_cmd;
#endif
static int
@@ -346,6 +351,28 @@
}
static int
+fzeroinit_f(
+ int argc,
+ char **argv)
+{
+ xfs_flock64_t segment;
+ int mode = FALLOC_FL_ZEROINIT_RANGE | FALLOC_FL_KEEP_SIZE;
+ int index = 1;
+
+ if (!offset_length(argv[index], argv[index + 1], &segment)) {
+ exitcode = 1;
+ return 0;
+ }
+
+ if (fallocate(file->fd, mode, segment.l_start, segment.l_len)) {
+ perror("fallocate");
+ exitcode = 1;
+ return 0;
+ }
+ return 0;
+}
+
+static int
funshare_f(
int argc,
char **argv)
@@ -503,6 +530,16 @@
_("zeroes space and eliminates holes by preallocating");
add_command(&fzero_cmd);
+ fzeroinit_cmd.name = "fzeroinit";
+ fzeroinit_cmd.cfunc = fzeroinit_f;
+ fzeroinit_cmd.argmin = 2;
+ fzeroinit_cmd.argmax = 2;
+ fzeroinit_cmd.flags = CMD_NOMAP_OK | CMD_FOREIGN_OK;
+ fzeroinit_cmd.args = _("off len");
+ fzeroinit_cmd.oneline =
+ _("zero-initializes allocated space");
+ add_command(&fzeroinit_cmd);
+
funshare_cmd.name = "funshare";
funshare_cmd.cfunc = funshare_f;
funshare_cmd.argmin = 2;
diff --git a/man/man8/xfs_io.8 b/man/man8/xfs_io.8
index 26eae3c..28115ac 100644
--- a/man/man8/xfs_io.8
+++ b/man/man8/xfs_io.8
@@ -536,6 +536,11 @@
.B -k
option, use the FALLOC_FL_KEEP_SIZE flag as well.
.TP
+.BI "fzeroinit " " offset length"
+Call fallocate with FALLOC_FL_ZEROINIT_RANGE flag as described in the
+.BR fallocate (2)
+manual page to allocate and zero blocks within the range.
+.TP
.BI zero " offset length"
Call xfsctl with
.B XFS_IOC_ZERO_RANGE
