Ensure that we can CoW the source file when the source file consists
of a range of mixed block types and there's a cowextsize hint set.
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Christoph Hellwig discovered that the kernel crashed trying to free
the refcount btree per-ag reservation on a ro mount (because we don't
create the reservation except for rw mounts and ro->rw remounts). So,
test this to make sure we never do that again. :)
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Set up an impossibly small filesystem and try to reflink and rewrite a
file on it to see what happens when we ENOSPC. Basically
generic/16[67] but with a constrained fs size.
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Use the extent size hint to force leftover CoW reservations then
crash the filesystem to see how recovery works.
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Ensure that we can pass absurdly enormous offsets and lengths to
reflink/dedupe and it'll survive.
v2: Ask for dedupe in the dedupe test.
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
[hch@lst.de: call _require_test_dedupe]
Signed-off-by: Christoph Hellwig <hch@lst.de>
Perform copy-on-writes at random offsets to stress the CoW allocation
system. Assess the effectiveness of the extent size hint at
combatting fragmentation via unshare, a rewrite, and no-op after the
random writes.
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Create a couple of XFS-specific tests -- one to check that growing
and shrinking the refcount btree works and a second one to check
what happens when we hit maximum refcount.
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Update the existing stress tests to ensure that we can handle
reflinking the same block a million times, and that we can handle
reflinking million different extents. Add a couple of tests to ensure
that we can ^C and SIGKILL our way out of long-running reflinks.
v2: Don't run the signal tests on NFS, as we cannot interrupt NFS
clone operations.
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
[hch@lst.de: don't run on NFS]
Signed-off-by: Christoph Hellwig <hch@lst.de>
Ensure that CoW operations against shared blocks in the source file
work correctly.
v2: remove filefrag dependencies
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Test various scenarios (with dm-flakey) where we simulate write
failures during CoW, to see if the FS can get through it without
blowing up or corrupting data. Plumb in a FS-generic method to
sort out repairing filesystems after they get hit by IO errors.
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Ensure that we correctly handle a CoW operation immediately followed
by a truncate, falloc, fpunch, fzero, fcollapse, and finsert operation
in the middle of the CoW'd region before any flush can occur.
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Check that we don't expose old disk contents when a directio write to
an unwritten extent fails due to IO errors. This primarily affects
XFS and ext4.
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Fix style problems such as unnecessary use of quotes, add helper
variables to reduce visual clutter, and other minor fixes to make the
first batch of tests more closely resemble the second round tests.
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Refactor the code that creates files with mixed block types that we feed
into CoW tests to make sure that we can tiptoe around that kind of stuff.
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Create a wrapper function that repairs any damage to the scratch
filesystem and returns a standard result. We will use this to clean
up after IO error testing and other weird corruption tests.
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Create a helper that looks for a test program in src/ and fails the
test if it doesn't exist. Refactor the existing testcases to use it.
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Darrick J. Wong