17f2871724
Add support for the DISCARD file operation. Discard punches a hole in a file in the provided range. Block de-allocation is implemented via fallocate() (as requested via fuse and passed on to the brick fs) but a separate fop is created within gluster to emphasize the fact that discard changes file data (the discarded region is replaced with zeroes) and must invalidate caches where appropriate. BUG: 963678 Change-Id: I34633a0bfff2187afeab4292a15f3cc9adf261af Signed-off-by: Brian Foster <bfoster@redhat.com> Reviewed-on: http://review.gluster.org/5090 Tested-by: Gluster Build System <jenkins@build.gluster.com> Reviewed-by: Anand Avati <avati@redhat.com>
57 lines
1.7 KiB
Bash
57 lines
1.7 KiB
Bash
#!/bin/bash
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#
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# Bug 963678 - Test discard functionality
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#
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# Test that basic discard (hole punch) functionality works via the fallocate
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# command line tool. Hole punch deallocates a region of a file, creating a hole
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# and a zero-filled data region. We verify that hole punch works, frees blocks
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# and that subsequent reads do not read stale data (caches are invalidated).
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#
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# NOTE: fuse fallocate is known to be broken with regard to cache invalidation
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# up to 3.9.0 kernels. Therefore, FOPEN_KEEP_CACHE is not used in this
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# test (opens will invalidate the fuse cache).
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###
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. $(dirname $0)/../include.rc
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. $(dirname $0)/../fallocate.rc
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cleanup;
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TEST glusterd
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TEST $CLI volume create $V0 replica 2 $H0:$B0/${V0}{1,2}
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TEST $CLI volume start $V0
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TEST glusterfs --volfile-id=$V0 --volfile-server=$H0 $M0 --attribute-timeout=0 --entry-timeout=0
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# check for fallocate and hole punch support
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require_fallocate -l 1m $M0/file
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require_fallocate -p -l 512k $M0/file && rm -f $M0/file
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# allocate some blocks, punch a hole and verify block allocation
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TEST fallocate -l 1m $M0/file
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blksz=`stat --printf=%B $M0/file`
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nblks=`stat --printf=%b $M0/file`
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TEST [ $(($blksz * $nblks)) -ge 1048576 ]
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TEST fallocate -p -o 512k -l 128k $M0/file
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nblks=`stat --printf=%b $M0/file`
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# allow some room for xattr blocks
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TEST [ $(($blksz * $nblks)) -lt $((917504 + 16384)) ]
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TEST unlink $M0/file
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# write some data, punch a hole and verify the file content changes
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TEST dd if=/dev/urandom of=$M0/file bs=1M count=1
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TEST cp $M0/file $M0/file.copy.pre
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TEST fallocate -p -o 512k -l 128k $M0/file
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TEST cp $M0/file $M0/file.copy.post
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TEST ! cmp $M0/file.copy.pre $M0/file.copy.post
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TEST unlink $M0/file
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TEST umount $M0
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TEST $CLI volume stop $V0
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TEST $CLI volume delete $V0
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cleanup;
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