From: Darrick J. Wong <djwong@xxxxxxxxxx>
Add a command to call XFS_IOC_MAP_FREESP. This is experimental code to
see if we can build a free space defragmenter out of this.
Signed-off-by: Darrick J. Wong <djwong@xxxxxxxxxx>
---
io/prealloc.c | 35 +++++++++++++++++++++++++++++++++++
man/man8/xfs_io.8 | 8 +++++++-
2 files changed, 42 insertions(+), 1 deletion(-)
diff --git a/io/prealloc.c b/io/prealloc.c
index 5805897a4a0..0de3e142de1 100644
--- a/io/prealloc.c
+++ b/io/prealloc.c
@@ -45,6 +45,7 @@ static cmdinfo_t finsert_cmd;
static cmdinfo_t fzero_cmd;
static cmdinfo_t funshare_cmd;
#endif
+static cmdinfo_t fmapfree_cmd;
static int
offset_length(
@@ -383,6 +384,30 @@ funshare_f(
}
#endif /* HAVE_FALLOCATE */
+static int
+fmapfree_f(
+ int argc,
+ char **argv)
+{
+ struct xfs_flock64 segment;
+ struct xfs_map_freesp args = { };
+
+ if (!offset_length(argv[1], argv[2], &segment)) {
+ exitcode = 1;
+ return 0;
+ }
+
+ args.offset = segment.l_start;
+ args.len = segment.l_len;
+
+ if (ioctl(file->fd, XFS_IOC_MAP_FREESP, &args)) {
+ perror("XFS_IOC_MAP_FREESP");
+ exitcode = 1;
+ return 0;
+ }
+ return 0;
+}
+
void
prealloc_init(void)
{
@@ -497,4 +522,14 @@ prealloc_init(void)
_("unshares shared blocks within the range");
add_command(&funshare_cmd);
#endif /* HAVE_FALLOCATE */
+
+ fmapfree_cmd.name = "fmapfree";
+ fmapfree_cmd.cfunc = fmapfree_f;
+ fmapfree_cmd.argmin = 2;
+ fmapfree_cmd.argmax = 2;
+ fmapfree_cmd.flags = CMD_NOMAP_OK | CMD_FOREIGN_OK;
+ fmapfree_cmd.args = _("off len");
+ fmapfree_cmd.oneline =
+ _("maps free space into a file");
+ add_command(&fmapfree_cmd);
}
diff --git a/man/man8/xfs_io.8 b/man/man8/xfs_io.8
index 411144151a1..e360d22dc38 100644
--- a/man/man8/xfs_io.8
+++ b/man/man8/xfs_io.8
@@ -513,8 +513,14 @@ Call fallocate with FALLOC_FL_INSERT_RANGE flag as described in the
.BR fallocate (2)
manual page to create the hole by shifting data blocks.
.TP
+.BI fmapfree " offset length"
+Maps free physical space into the file by calling XFS_IOC_MAP_FREESP as
+described in the
+.BR XFS_IOC_MAP_FREESP (2)
+manual page.
+.TP
.BI fpunch " offset length"
-Punches (de-allocates) blocks in the file by calling fallocate with
+Punches (de-allocates) blocks in the file by calling fallocate with
the FALLOC_FL_PUNCH_HOLE flag as described in the
.BR fallocate (2)
manual page.
