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From 7e8a6edb4d1ba0079152eb477abbbc1dfb1ebb7e Mon Sep 17 00:00:00 2001
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From: Pavel Reichl <preichl@redhat.com>
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Date: Fri, 13 Dec 2019 16:21:26 -0500
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Subject: [PATCH] mkfs: Break block discard into chunks of 2 GB
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Some users are not happy about the BLKDISCARD taking too long and at the
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same time not being informed about that - so they think that the command
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actually hung.
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This commit changes code so that progress reporting is possible and also
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typing the ^C will cancel the ongoing BLKDISCARD.
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Signed-off-by: Pavel Reichl <preichl@redhat.com>
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Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
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Reviewed-by: Dave Chinner <dchinner@redhat.com>
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Signed-off-by: Eric Sandeen <sandeen@sandeen.net>
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---
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mkfs/xfs_mkfs.c | 50 ++++++++++++++++++++++++++++++++++++-------------
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1 file changed, 37 insertions(+), 13 deletions(-)
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diff --git a/mkfs/xfs_mkfs.c b/mkfs/xfs_mkfs.c
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index 18338a61..4bfdebf6 100644
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--- a/mkfs/xfs_mkfs.c
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+++ b/mkfs/xfs_mkfs.c
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@@ -1240,17 +1240,40 @@ done:
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}
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static void
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-discard_blocks(dev_t dev, uint64_t nsectors)
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+discard_blocks(dev_t dev, uint64_t nsectors, int quiet)
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{
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- int fd;
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+ int fd;
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+ uint64_t offset = 0;
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+ /* Discard the device 2G at a time */
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+ const uint64_t step = 2ULL << 30;
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+ const uint64_t count = BBTOB(nsectors);
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- /*
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- * We intentionally ignore errors from the discard ioctl. It is
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- * not necessary for the mkfs functionality but just an optimization.
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- */
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fd = libxfs_device_to_fd(dev);
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- if (fd > 0)
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- platform_discard_blocks(fd, 0, nsectors << 9);
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+ if (fd <= 0)
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+ return;
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+ if (!quiet) {
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+ printf("Discarding blocks...");
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+ fflush(stdout);
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+ }
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+
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+ /* The block discarding happens in smaller batches so it can be
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+ * interrupted prematurely
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+ */
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+ while (offset < count) {
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+ uint64_t tmp_step = min(step, count - offset);
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+
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+ /*
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+ * We intentionally ignore errors from the discard ioctl. It is
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+ * not necessary for the mkfs functionality but just an
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+ * optimization. However we should stop on error.
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+ */
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+ if (platform_discard_blocks(fd, offset, tmp_step))
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+ return;
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+
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+ offset += tmp_step;
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+ }
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+ if (!quiet)
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+ printf("Done.\n");
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}
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static __attribute__((noreturn)) void
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@@ -2507,18 +2530,19 @@ open_devices(
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static void
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discard_devices(
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- struct libxfs_xinit *xi)
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+ struct libxfs_xinit *xi,
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+ int quiet)
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{
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/*
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* This function has to be called after libxfs has been initialized.
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*/
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if (!xi->disfile)
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- discard_blocks(xi->ddev, xi->dsize);
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+ discard_blocks(xi->ddev, xi->dsize, quiet);
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if (xi->rtdev && !xi->risfile)
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- discard_blocks(xi->rtdev, xi->rtsize);
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+ discard_blocks(xi->rtdev, xi->rtsize, quiet);
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if (xi->logdev && xi->logdev != xi->ddev && !xi->lisfile)
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- discard_blocks(xi->logdev, xi->logBBsize);
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+ discard_blocks(xi->logdev, xi->logBBsize, quiet);
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}
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static void
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@@ -3749,7 +3773,7 @@ main(
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* All values have been validated, discard the old device layout.
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*/
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if (discard && !dry_run)
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- discard_devices(&xi);
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+ discard_devices(&xi, quiet);
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/*
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* we need the libxfs buffer cache from here on in.
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--
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2.17.0
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