[Libguestfs] [PATCH v2 1/2] New API: guestfs_blockdev_setra: Adjust readahead for filesystems and devices.
This adds a binding for 'blockdev --setra', allowing you to adjust the
readahead parameter for filesystems and devices.
---
daemon/blockdev.c | 30 ++++++++++++++++++++----------
generator/actions.ml | 14 ++++++++++++++
2 files changed, 34 insertions(+), 10 deletions(-)
diff --git a/daemon/blockdev.c b/daemon/blockdev.c
index 8a7b1a8..6e8821d 100644
--- a/daemon/blockdev.c
+++ b/daemon/blockdev.c
@@ -62,7 +62,7 @@ call_blockdev (const char *device, const char *switc, int extraarg, int
prints)
*/
udev_settle ();
- if (extraarg > 0) {
+ if (extraarg >= 0) {
snprintf (buf, sizeof buf, "%d", extraarg);
argv[2] = buf;
argv[3] = device;
@@ -89,33 +89,43 @@ call_blockdev (const char *device, const char *switc, int extraarg,
int prints)
}
int
+do_blockdev_setra (const char *device, int sectors)
+{
+ if (sectors < 0) {
+ reply_with_error ("readahead sectors must be >= 0");
+ return -1;
+ }
+ return (int) call_blockdev (device, "--setra", sectors, 0);
+}
+
+int
do_blockdev_setro (const char *device)
{
- return (int) call_blockdev (device, "--setro", 0, 0);
+ return (int) call_blockdev (device, "--setro", -1, 0);
}
int
do_blockdev_setrw (const char *device)
{
- return (int) call_blockdev (device, "--setrw", 0, 0);
+ return (int) call_blockdev (device, "--setrw", -1, 0);
}
int
do_blockdev_getro (const char *device)
{
- return (int) call_blockdev (device, "--getro", 0, 1);
+ return (int) call_blockdev (device, "--getro", -1, 1);
}
int
do_blockdev_getss (const char *device)
{
- return (int) call_blockdev (device, "--getss", 0, 1);
+ return (int) call_blockdev (device, "--getss", -1, 1);
}
int
do_blockdev_getbsz (const char *device)
{
- return (int) call_blockdev (device, "--getbsz", 0, 1);
+ return (int) call_blockdev (device, "--getbsz", -1, 1);
}
int
@@ -128,23 +138,23 @@ do_blockdev_setbsz (const char *device, int blocksize)
int64_t
do_blockdev_getsz (const char *device)
{
- return call_blockdev (device, "--getsz", 0, 1);
+ return call_blockdev (device, "--getsz", -1, 1);
}
int64_t
do_blockdev_getsize64 (const char *device)
{
- return call_blockdev (device, "--getsize64", 0, 1);
+ return call_blockdev (device, "--getsize64", -1, 1);
}
int
do_blockdev_flushbufs (const char *device)
{
- return call_blockdev (device, "--flushbufs", 0, 0);
+ return call_blockdev (device, "--flushbufs", -1, 0);
}
int
do_blockdev_rereadpt (const char *device)
{
- return call_blockdev (device, "--rereadpt", 0, 0);
+ return call_blockdev (device, "--rereadpt", -1, 0);
}
diff --git a/generator/actions.ml b/generator/actions.ml
index fe492e6..baa7679 100644
--- a/generator/actions.ml
+++ b/generator/actions.ml
@@ -12003,6 +12003,20 @@ This is the same as the C<lstat(2)> system call." };
longdesc = "\
This is the internal call which implements C<guestfs_lstatnslist>." };
+ { defaults with
+ name = "blockdev_setra";
+ style = RErr, [Device "device"; Int "sectors"], [];
+ proc_nr = Some 424;
+ tests = [
+ InitEmpty, Always, TestRun (
+ [["blockdev_setra"; "/dev/sda"; "1024" ]]), []
+ ];
+ shortdesc = "set readahead";
+ longdesc = "\
+Set readahead (in 512-byte sectors) for the device.
+
+This uses the L<blockdev(8)> command." };
+
]
(* Non-API meta-commands available only in guestfish.
--
2.1.0