Add fzero command which zeroes a range of the file using
fallocate FALLOC_FL_ZERO_RANGE flag.
Signed-off-by: Lukas Czerner <lczerner@xxxxxxxxxx>
---
io/prealloc.c | 42 +++++++++++++++++++++++++++++++++++++++++-
man/man8/xfs_io.8 | 5 +++++
2 files changed, 46 insertions(+), 1 deletion(-)
diff --git a/io/prealloc.c b/io/prealloc.c
index d697f82..71ca877 100644
--- a/io/prealloc.c
+++ b/io/prealloc.c
@@ -33,6 +33,10 @@
#define FALLOC_FL_COLLAPSE_RANGE 0x08
#endif
+#ifndef FALLOC_FL_ZERO_RANGE
+#define FALLOC_FL_ZERO_RANGE 0x10
+#endif
+
static cmdinfo_t allocsp_cmd;
static cmdinfo_t freesp_cmd;
static cmdinfo_t resvsp_cmd;
@@ -42,6 +46,7 @@ static cmdinfo_t zero_cmd;
static cmdinfo_t falloc_cmd;
static cmdinfo_t fpunch_cmd;
static cmdinfo_t fcollapse_cmd;
+static cmdinfo_t fzero_cmd;
#endif
static int
@@ -230,6 +235,31 @@ fcollapse_f(
}
return 0;
}
+
+static int
+fzero_f(
+ int argc,
+ char **argv)
+{
+ xfs_flock64_t segment;
+ int mode = FALLOC_FL_ZERO_RANGE;
+ int index = 1;
+
+ if (strncmp(argv[index], "-k", 3) == 0) {
+ mode |= FALLOC_FL_KEEP_SIZE;
+ index++;
+ }
+
+ if (!offset_length(argv[index], argv[index + 1], &segment))
+ return 0;
+
+ if (fallocate(file->fd, mode,
+ segment.l_start, segment.l_len)) {
+ perror("fallocate");
+ return 0;
+ }
+ return 0;
+}
#endif /* HAVE_FALLOCATE */
void
@@ -312,7 +342,17 @@ prealloc_init(void)
fcollapse_cmd.flags = CMD_NOMAP_OK | CMD_FOREIGN_OK;
fcollapse_cmd.args = _("off len");
fcollapse_cmd.oneline =
- _("de-allocates space and eliminates the hole by shifting extents");
+ _("de-allocates space and eliminates the hole by shifting extents");
add_command(&fcollapse_cmd);
+
+ fzero_cmd.name = "fzero";
+ fzero_cmd.cfunc = fzero_f;
+ fzero_cmd.argmin = 2;
+ fzero_cmd.argmax = 3;
+ fzero_cmd.flags = CMD_NOMAP_OK | CMD_FOREIGN_OK;
+ fzero_cmd.args = _("[-k] off len");
+ fzero_cmd.oneline =
+ _("zeroes space and eliminates holes by preallocating");
+ add_command(&fzero_cmd);
#endif /* HAVE_FALLOCATE */
}
diff --git a/man/man8/xfs_io.8 b/man/man8/xfs_io.8
index 9543b20..e95cf70 100644
--- a/man/man8/xfs_io.8
+++ b/man/man8/xfs_io.8
@@ -392,6 +392,11 @@ the FALLOC_FL_PUNCH_HOLE flag as described in the
.BR fallocate (2)
manual page.
.TP
+.BI fzero " offset length"
+Call fallocate with FALLOC_FL_ZERO_RANGE flag as described in the
+.BR fallocate (2)
+manual page to allocate and zero blocks within the range.
+.TP
.BI truncate " offset"
Truncates the current file at the given offset using
.BR ftruncate (2).
--
1.8.3.1
--
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