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Updates #1035
PiperOrigin-RevId: 293194631
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Updates #1198
Opening host pipes (by spinning in fdpipe) and host sockets is not yet
complete, and will be done in a future CL.
Major differences from VFS1 gofer client (sentry/fs/gofer), with varying levels
of backportability:
- "Cache policies" are replaced by InteropMode, which control the behavior of
timestamps in addition to caching. Under InteropModeExclusive (analogous to
cacheAll) and InteropModeWritethrough (analogous to cacheAllWritethrough),
client timestamps are *not* written back to the server (it is not possible in
9P or Linux for clients to set ctime, so writing back client-authoritative
timestamps results in incoherence between atime/mtime and ctime). Under
InteropModeShared (analogous to cacheRemoteRevalidating), client timestamps
are not used at all (remote filesystem clocks are authoritative). cacheNone
is translated to InteropModeShared + new option
filesystemOptions.specialRegularFiles.
- Under InteropModeShared, "unstable attribute" reloading for permission
checks, lookup, and revalidation are fused, which is feasible in VFS2 since
gofer.filesystem controls path resolution. This results in a ~33% reduction
in RPCs for filesystem operations compared to cacheRemoteRevalidating. For
example, consider stat("/foo/bar/baz") where "/foo/bar/baz" fails
revalidation, resulting in the instantiation of a new dentry:
VFS1 RPCs:
getattr("/") // fs.MountNamespace.FindLink() => fs.Inode.CheckPermission() => gofer.inodeOperations.check() => gofer.inodeOperations.UnstableAttr()
walkgetattr("/", "foo") = fid1 // fs.Dirent.walk() => gofer.session.Revalidate() => gofer.cachePolicy.Revalidate()
clunk(fid1)
getattr("/foo") // CheckPermission
walkgetattr("/foo", "bar") = fid2 // Revalidate
clunk(fid2)
getattr("/foo/bar") // CheckPermission
walkgetattr("/foo/bar", "baz") = fid3 // Revalidate
clunk(fid3)
walkgetattr("/foo/bar", "baz") = fid4 // fs.Dirent.walk() => gofer.inodeOperations.Lookup
getattr("/foo/bar/baz") // linux.stat() => gofer.inodeOperations.UnstableAttr()
VFS2 RPCs:
getattr("/") // gofer.filesystem.walkExistingLocked()
walkgetattr("/", "foo") = fid1 // gofer.filesystem.stepExistingLocked()
clunk(fid1)
// No getattr: walkgetattr already updated metadata for permission check
walkgetattr("/foo", "bar") = fid2
clunk(fid2)
walkgetattr("/foo/bar", "baz") = fid3
// No clunk: fid3 used for new gofer.dentry
// No getattr: walkgetattr already updated metadata for stat()
- gofer.filesystem.unlinkAt() does not require instantiation of a dentry that
represents the file to be deleted. Updates #898.
- gofer.regularFileFD.OnClose() skips Tflushf for regular files under
InteropModeExclusive, as it's nonsensical to request a remote file flush
without flushing locally-buffered writes to that remote file first.
- Symlink targets are cached when InteropModeShared is not in effect.
- p9.QID.Path (which is already required to be unique for each file within a
server, and is accordingly already synthesized from device/inode numbers in
all known gofers) is used as-is for inode numbers, rather than being mapped
along with attr.RDev in the client to yet another synthetic inode number.
- Relevant parts of fsutil.CachingInodeOperations are inlined directly into
gofer package code. This avoids having to duplicate part of its functionality
in fsutil.HostMappable.
PiperOrigin-RevId: 293190213
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Internal pipes are supported similarly to how internal UDS is done.
It is also controlled by the same flag.
Fixes #1102
PiperOrigin-RevId: 293150045
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PiperOrigin-RevId: 293029446
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PiperOrigin-RevId: 292624867
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Add a file lock implementation that can be embedded into various filesystem
implementations.
Updates #1480
PiperOrigin-RevId: 292614758
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As per RFC 2464 section 7, an IPv6 packet with a multicast destination
address is transmitted to the mapped Ethernet multicast address.
Test:
- ipv6.TestLinkResolution
- stack_test.TestDADResolve
- stack_test.TestRouterSolicitation
PiperOrigin-RevId: 292610529
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Test: header.TestEthernetAddressFromMulticastIPAddress
PiperOrigin-RevId: 292604649
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PiperOrigin-RevId: 292587459
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When sending a RST on shutdown we need to double check the
state after acquiring the work mutex as the endpoint could
have transitioned out of a connected state from the time
we checked it and we acquired the workMutex.
I added two tests but sadly neither reproduce the panic. I am
going to leave the tests in as they are good to have anyway.
PiperOrigin-RevId: 292393800
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PiperOrigin-RevId: 292369598
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Splice must not allow negative offsets. Writes also must not allow offset +
size to overflow int64. Reads are similarly broken, but not just in splice
(b/148095030).
Reported-by: syzbot+0e1ff0b95fb2859b4190@syzkaller.appspotmail.com
PiperOrigin-RevId: 292361208
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When sending NDP messages with an unspecified source address, the Source
Link Layer address must not be included.
Test: stack_test.TestDADResolve
PiperOrigin-RevId: 292341334
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Do not start a new goroutine when calling
stack.NDPDispatcher.OnDuplicateAddressDetectionStatus.
PiperOrigin-RevId: 292268574
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PiperOrigin-RevId: 292233574
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Updates #1480
PiperOrigin-RevId: 292180192
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For amd64, this has been done on cl/288342928.
PiperOrigin-RevId: 292170856
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PiperOrigin-RevId: 292165063
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For test case 'TestBounce', we use KVM_SET_VCPU_EVENTS to trigger sError
to leave guest.
Signed-off-by: Bin Lu <bin.lu@arm.com>
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Currently, Send() will copy data into a new byte slice without regard to the
original size. Size checks should be performed before the allocation takes
place.
Note that for the sake of performance, we avoid putting the buffer
allocation into the critical section. As a result, the size checks need to be
performed again within Enqueue() in case the limit has changed.
PiperOrigin-RevId: 292058147
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WritableSource is a convenience interface used for files that can
be written to, e.g. /proc/net/ipv4/tpc_sack. It reads max of 4KB
and only from offset 0 which should cover most cases. It can be
extended as neeed.
Updates #1195
PiperOrigin-RevId: 292056924
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Updates #1487
Updates #1623
PiperOrigin-RevId: 292040835
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Update link address for senders of NDP Neighbor Solicitations when the NS
contains an NDP Source Link Layer Address option.
Tests:
- ipv6.TestNeighorSolicitationWithSourceLinkLayerOption
- ipv6.TestNeighorSolicitationWithInvalidSourceLinkLayerOption
PiperOrigin-RevId: 292028553
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FD table now holds both VFS1 and VFS2 types and uses the correct
one based on what's set.
Parts of this CL are just initial changes (e.g. sys_read.go,
runsc/main.go) to serve as a template for the remaining changes.
Updates #1487
Updates #1623
PiperOrigin-RevId: 292023223
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PiperOrigin-RevId: 292021389
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Test: stack_test.TestDADResolve
PiperOrigin-RevId: 292003124
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Special files can have additional requirements for granularity.
For example, read from eventfd returns EINVAL if a size is less 8 bytes.
Reported-by: syzbot+3905f5493bec08eb7b02@syzkaller.appspotmail.com
PiperOrigin-RevId: 292002926
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