* [PATCH v2 1/1] mkfs: Break block discard into chunks of 2 GB
@ 2019-11-27 21:21 Pavel Reichl
2019-11-28 6:17 ` Pavel Reichl
0 siblings, 1 reply; 2+ messages in thread
From: Pavel Reichl @ 2019-11-27 21:21 UTC (permalink / raw)
To: linux-xfs; +Cc: Pavel Reichl
Some users are not happy about the BLKDISCARD taking too long and at the same
time not being informed about that - so they think that the command actually
hung.
This commit changes code so that progress reporting is possible and also typing
the ^C will cancel the ongoing BLKDISCARD.
Signed-off-by: Pavel Reichl <preichl@redhat.com>
---
mkfs/xfs_mkfs.c | 50 ++++++++++++++++++++++++++++++++++++-------------
1 file changed, 37 insertions(+), 13 deletions(-)
diff --git a/mkfs/xfs_mkfs.c b/mkfs/xfs_mkfs.c
index 18338a61..7fa4af0e 100644
--- a/mkfs/xfs_mkfs.c
+++ b/mkfs/xfs_mkfs.c
@@ -1240,17 +1240,40 @@ done:
}
static void
-discard_blocks(dev_t dev, uint64_t nsectors)
+discard_blocks(dev_t dev, uint64_t nsectors, int quiet)
{
- int fd;
+ int fd;
+ uint64_t offset = 0;
+ /* Discard the device 2G at a time */
+ const uint64_t step = 2ULL << 30;
+ const uint64_t count = BBTOB(nsectors);
- /*
- * We intentionally ignore errors from the discard ioctl. It is
- * not necessary for the mkfs functionality but just an optimization.
- */
fd = libxfs_device_to_fd(dev);
- if (fd > 0)
- platform_discard_blocks(fd, 0, nsectors << 9);
+ if (fd <= 0)
+ return;
+ if (!quiet) {
+ printf("Discarding blocks...");
+ printf("...");
+ }
+
+ /* The block discarding happens in smaller batches so it can be
+ * interrupted prematurely
+ */
+ while (offset < count) {
+ uint64_t tmp_step = min(step, count - offset);
+
+ /*
+ * We intentionally ignore errors from the discard ioctl. It is
+ * not necessary for the mkfs functionality but just an
+ * optimization. However we should stop on error.
+ */
+ if (platform_discard_blocks(fd, offset, tmp_step))
+ return;
+
+ offset += tmp_step;
+ }
+ if (!quiet)
+ printf("Done.\n");
}
static __attribute__((noreturn)) void
@@ -2507,18 +2530,19 @@ open_devices(
static void
discard_devices(
- struct libxfs_xinit *xi)
+ struct libxfs_xinit *xi,
+ int quiet)
{
/*
* This function has to be called after libxfs has been initialized.
*/
if (!xi->disfile)
- discard_blocks(xi->ddev, xi->dsize);
+ discard_blocks(xi->ddev, xi->dsize, quiet);
if (xi->rtdev && !xi->risfile)
- discard_blocks(xi->rtdev, xi->rtsize);
+ discard_blocks(xi->rtdev, xi->rtsize, quiet);
if (xi->logdev && xi->logdev != xi->ddev && !xi->lisfile)
- discard_blocks(xi->logdev, xi->logBBsize);
+ discard_blocks(xi->logdev, xi->logBBsize, quiet);
}
static void
@@ -3749,7 +3773,7 @@ main(
* All values have been validated, discard the old device layout.
*/
if (discard && !dry_run)
- discard_devices(&xi);
+ discard_devices(&xi, quiet);
/*
* we need the libxfs buffer cache from here on in.
--
2.23.0
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH v2 1/1] mkfs: Break block discard into chunks of 2 GB
2019-11-27 21:21 [PATCH v2 1/1] mkfs: Break block discard into chunks of 2 GB Pavel Reichl
@ 2019-11-28 6:17 ` Pavel Reichl
0 siblings, 0 replies; 2+ messages in thread
From: Pavel Reichl @ 2019-11-28 6:17 UTC (permalink / raw)
To: linux-xfs
Oh, I forgot to add '\n' to one of the printf statements. I'll send
fixed patch immediately.
On Wed, Nov 27, 2019 at 10:23 PM Pavel Reichl <preichl@redhat.com> wrote:
>
> Some users are not happy about the BLKDISCARD taking too long and at the same
> time not being informed about that - so they think that the command actually
> hung.
>
> This commit changes code so that progress reporting is possible and also typing
> the ^C will cancel the ongoing BLKDISCARD.
>
> Signed-off-by: Pavel Reichl <preichl@redhat.com>
> ---
> mkfs/xfs_mkfs.c | 50 ++++++++++++++++++++++++++++++++++++-------------
> 1 file changed, 37 insertions(+), 13 deletions(-)
>
> diff --git a/mkfs/xfs_mkfs.c b/mkfs/xfs_mkfs.c
> index 18338a61..7fa4af0e 100644
> --- a/mkfs/xfs_mkfs.c
> +++ b/mkfs/xfs_mkfs.c
> @@ -1240,17 +1240,40 @@ done:
> }
>
> static void
> -discard_blocks(dev_t dev, uint64_t nsectors)
> +discard_blocks(dev_t dev, uint64_t nsectors, int quiet)
> {
> - int fd;
> + int fd;
> + uint64_t offset = 0;
> + /* Discard the device 2G at a time */
> + const uint64_t step = 2ULL << 30;
> + const uint64_t count = BBTOB(nsectors);
>
> - /*
> - * We intentionally ignore errors from the discard ioctl. It is
> - * not necessary for the mkfs functionality but just an optimization.
> - */
> fd = libxfs_device_to_fd(dev);
> - if (fd > 0)
> - platform_discard_blocks(fd, 0, nsectors << 9);
> + if (fd <= 0)
> + return;
> + if (!quiet) {
> + printf("Discarding blocks...");
> + printf("...");
> + }
> +
> + /* The block discarding happens in smaller batches so it can be
> + * interrupted prematurely
> + */
> + while (offset < count) {
> + uint64_t tmp_step = min(step, count - offset);
> +
> + /*
> + * We intentionally ignore errors from the discard ioctl. It is
> + * not necessary for the mkfs functionality but just an
> + * optimization. However we should stop on error.
> + */
> + if (platform_discard_blocks(fd, offset, tmp_step))
> + return;
> +
> + offset += tmp_step;
> + }
> + if (!quiet)
> + printf("Done.\n");
> }
>
> static __attribute__((noreturn)) void
> @@ -2507,18 +2530,19 @@ open_devices(
>
> static void
> discard_devices(
> - struct libxfs_xinit *xi)
> + struct libxfs_xinit *xi,
> + int quiet)
> {
> /*
> * This function has to be called after libxfs has been initialized.
> */
>
> if (!xi->disfile)
> - discard_blocks(xi->ddev, xi->dsize);
> + discard_blocks(xi->ddev, xi->dsize, quiet);
> if (xi->rtdev && !xi->risfile)
> - discard_blocks(xi->rtdev, xi->rtsize);
> + discard_blocks(xi->rtdev, xi->rtsize, quiet);
> if (xi->logdev && xi->logdev != xi->ddev && !xi->lisfile)
> - discard_blocks(xi->logdev, xi->logBBsize);
> + discard_blocks(xi->logdev, xi->logBBsize, quiet);
> }
>
> static void
> @@ -3749,7 +3773,7 @@ main(
> * All values have been validated, discard the old device layout.
> */
> if (discard && !dry_run)
> - discard_devices(&xi);
> + discard_devices(&xi, quiet);
>
> /*
> * we need the libxfs buffer cache from here on in.
> --
> 2.23.0
>
^ permalink raw reply [flat|nested] 2+ messages in thread
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