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Fixes #701
PiperOrigin-RevId: 316025635
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Major differences from existing overlay filesystems:
- Linux allows lower layers in an overlay to require revalidation, but not the
upper layer. VFS1 allows the upper layer in an overlay to require
revalidation, but not the lower layer. VFS2 does not allow any layers to
require revalidation. (Now that vfs.MkdirOptions.ForSyntheticMountpoint
exists, no uses of overlay in VFS1 are believed to require upper layer
revalidation; in particular, the requirement that the upper layer support the
creation of "trusted." extended attributes for whiteouts effectively required
the upper filesystem to be tmpfs in most cases.)
- Like VFS1, but unlike Linux, VFS2 overlay does not attempt to make mutations
of the upper layer atomic using a working directory and features like
RENAME_WHITEOUT. (This may change in the future, since not having a working
directory makes error recovery for some operations, e.g. rmdir, particularly
painful.)
- Like Linux, but unlike VFS1, VFS2 represents whiteouts using character
devices with rdev == 0; the equivalent of the whiteout attribute on
directories is xattr trusted.overlay.opaque = "y"; and there is no equivalent
to the whiteout attribute on non-directories since non-directories are never
merged with lower layers.
- Device and inode numbers work as follows:
- In Linux, modulo the xino feature and a special case for when all layers
are the same filesystem:
- Directories use the overlay filesystem's device number and an
ephemeral inode number assigned by the overlay.
- Non-directories that have been copied up use the device and inode
number assigned by the upper filesystem.
- Non-directories that have not been copied up use a per-(overlay,
layer)-pair device number and the inode number assigned by the lower
filesystem.
- In VFS1, device and inode numbers always come from the lower layer unless
"whited out"; this has the adverse effect of requiring interaction with
the lower filesystem even for non-directory files that exist on the upper
layer.
- In VFS2, device and inode numbers are assigned as in Linux, except that
xino and the samefs special case are not supported.
- Like Linux, but unlike VFS1, VFS2 does not attempt to maintain memory mapping
coherence across copy-up. (This may have to change in the future, as users
may be dependent on this property.)
- Like Linux, but unlike VFS1, VFS2 uses the overlayfs mounter's credentials
when interacting with the overlay's layers, rather than the caller's.
- Like Linux, but unlike VFS1, VFS2 permits multiple lower layers in an
overlay.
- Like Linux, but unlike VFS1, VFS2's overlay filesystem is
application-mountable.
Updates #1199
PiperOrigin-RevId: 316019067
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Tentative addresses should not be used when finding a route. This change
fixes a bug where a tentative address may have been used.
Test: stack_test.TestDADResolve
PiperOrigin-RevId: 315997624
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PiperOrigin-RevId: 315991648
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During inititalization inode struct was copied around, but
it isn't great pratice to copy it around since it contains
ref count and sync.Mutex.
Updates #1480
PiperOrigin-RevId: 315983788
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A method is added to generate a merkle tree for data, and store the
generated tree in the output.
PiperOrigin-RevId: 315966571
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PiperOrigin-RevId: 315959279
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This change creates a merkletree package which will be used in the future
for an implementation of file system API.
PiperOrigin-RevId: 315952451
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On UDP sockets, SO_REUSEADDR allows multiple sockets to bind to the same
address, but only delivers packets to the most recently bound socket. This
differs from the behavior of SO_REUSEADDR on TCP sockets. SO_REUSEADDR for TCP
sockets will likely need an almost completely independent implementation.
SO_REUSEADDR has some odd interactions with the similar SO_REUSEPORT. These
interactions are tested fairly extensively and all but one particularly odd
one (that honestly seems like a bug) behave the same on gVisor and Linux.
PiperOrigin-RevId: 315844832
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doAction()->log.TracebackAll() will append a colon.
PiperOrigin-RevId: 315842611
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When I do high-performance networking,
the value of wmem_max is often set very high,
specially for 10/25/50 Gigabit NIC.
I think maybe this restriction is not suitable.
Signed-off-by: Bin Lu <bin.lu@arm.com>
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PiperOrigin-RevId: 315812219
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gaurav1086:sentry_kernel_timekeeper_use_buffered_channel
PiperOrigin-RevId: 315803553
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TCP_KEEPCNT is used to set the maximum keepalive probes to be
sent before dropping the connection.
WANT_LGTM=jchacon
PiperOrigin-RevId: 315758094
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In case of SOCK_SEQPACKET, it has to be ignored.
In case of SOCK_STREAM, EISCONN or EOPNOTSUPP has to be returned.
PiperOrigin-RevId: 315755972
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PiperOrigin-RevId: 315745386
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PiperOrigin-RevId: 315734425
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Minimum header sizes are already checked in each `case` arm below. Worse, the
ICMP entries in transportProtocolMinSizes are incorrect, and produce false "raw
packet" logs.
PiperOrigin-RevId: 315730073
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PiperOrigin-RevId: 315711208
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Closes #1623
PiperOrigin-RevId: 315681993
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