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NFS: Fix up read of mirror stats

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Need to lock while reading in order to ensure 64-bit reads are correct.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
This commit is contained in:
Trond Myklebust 2016-10-03 18:13:20 -04:00
parent 08e2e5bc6c
commit 2f8220c16e
1 changed files with 2 additions and 0 deletions
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2
fs/nfs/flexfilelayout/flexfilelayout.c
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@ -2250,10 +2250,12 @@ ff_layout_mirror_prepare_stats(struct pnfs_layout_hdr *lo,
memcpy(&devinfo->dev_id, &dev->deviceid, NFS4_DEVICEID4_SIZE);
devinfo->offset = 0;
devinfo->length = NFS4_MAX_UINT64;
spin_lock(&mirror->lock);
devinfo->read_count = mirror->read_stat.io_stat.ops_completed;
devinfo->read_bytes = mirror->read_stat.io_stat.bytes_completed;
devinfo->write_count = mirror->write_stat.io_stat.ops_completed;
devinfo->write_bytes = mirror->write_stat.io_stat.bytes_completed;
spin_unlock(&mirror->lock);
devinfo->layout_type = LAYOUT_FLEX_FILES;
devinfo->layoutstats_encode = ff_layout_encode_layoutstats;
devinfo->layout_private = mirror;