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PiperOrigin-RevId: 282667122
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- Remove the Filesystem argument from DentryImpl.*Ref(); in general DentryImpls
that need the Filesystem for reference counting will probably also need it
for other interface methods that don't plumb Filesystem, so it's easier to
just store a pointer to the filesystem in the DentryImpl.
- Add a pointer to the VirtualFilesystem to Filesystem, which is needed by the
gofer client to disown dentries for cache eviction triggered by dentry
reference count changes.
- Rename FilesystemType.NewFilesystem to GetFilesystem; in some cases (e.g.
sysfs, cgroupfs) it's much cleaner for there to be only one Filesystem that
is used by all mounts, and in at least one case (devtmpfs) it's visibly
incorrect not to do so, so NewFilesystem doesn't always actually create and
return a *new* Filesystem.
- Require callers of FileDescription.Init() to increment Mount/Dentry
references. This is because the gofer client may, in the OpenAt() path, take
a reference on a dentry with 0 references, which is safe due to
synchronization that is outside the scope of this CL, and it would be safer
to still have its implementation of DentryImpl.IncRef() check for an
increment for 0 references in other cases.
- Add FileDescription.TryIncRef. This is used by the gofer client to take
references on "special file descriptions" (FDs for files such as pipes,
sockets, and devices), which use per-FD handles (fids) instead of
dentry-shared handles, for sync() and syncfs().
PiperOrigin-RevId: 282473364
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This is required to test filesystems with a non-trivial implementation of
FilesystemImpl.Release(). Propagation isn't handled yet, and umount isn't yet
plumbed out to VirtualFilesystem.UmountAt(), but otherwise the implementation
of umount is believed to be correct.
- Move entering mountTable.seq writer critical sections to callers of
mountTable.{insert,remove}Seqed. This is required since umount(2) must ensure
that no new references are taken on the candidate mount after checking that
it isn't busy, which is only possible by entering a vfs.mountTable.seq writer
critical section before the check and remaining in it until after
VFS.umountRecursiveLocked() is complete. (Linux does the same thing:
fs/namespace.c:do_umount() => lock_mount_hash(),
fs/pnode.c:propagate_mount_busy(), umount_tree(), unlock_mount_hash().)
- It's not possible for dentry deletion to umount while only holding
VFS.mountMu for reading, but it's also very unappealing to hold VFS.mountMu
exclusively around e.g. gofer unlink RPCs. Introduce dentry.mu to avoid these
problems. This means that VFS.mountMu is never acquired for reading, so
change it to a sync.Mutex.
PiperOrigin-RevId: 282444343
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With the ticks, the command `master` is actually be run and the output included
(which is nothing). This is confusing, as we actually mean to say "master" in
the description of the Go branch.
PiperOrigin-RevId: 282426081
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PiperOrigin-RevId: 282401165
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PiperOrigin-RevId: 282396322
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PiperOrigin-RevId: 282382564
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These are necessary for iptables to read and parse headers for packet filtering.
PiperOrigin-RevId: 282372811
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Packets written via SOCK_RAW are guaranteed to have network headers, but not
transport headers. Check first whether there are enough bytes left in the packet
to contain a transport header before attempting to parse it.
PiperOrigin-RevId: 282363895
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PiperOrigin-RevId: 282194656
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PiperOrigin-RevId: 282068093
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The first use of time.Local (usually via time.Time.Date, et. al) performs
initialization of the local timezone, which involves open several tzdata files
from the host.
Since filter installation disallows open, we should explicitly force this
initialization rather than implicitly depending on the first logging (or other
time) call occurring before filter installation.
PiperOrigin-RevId: 282053121
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This allows us to ensure that the correct port reservation is released.
Fixes #1217
PiperOrigin-RevId: 282048155
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PiperOrigin-RevId: 282045221
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PiperOrigin-RevId: 282023891
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Signed-off-by: Bin Lu <bin.lu@arm.com>
COPYBARA_INTEGRATE_REVIEW=https://github.com/google/gvisor/pull/891 from lubinszARM:pr_pagetable 2385de75a8662af3ab1ae289dd74dd0e5dcfaf66
PiperOrigin-RevId: 282013224
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This is how it has to be accoding to the man page.
PiperOrigin-RevId: 281998068
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PiperOrigin-RevId: 281795269
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PiperOrigin-RevId: 281617882
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Note that the Sentry still calls Truncate() on the file before calling Open.
A new p9 version check was added to ensure that the p9 server can handle the
the OpenTruncate flag. If not, then the flag is stripped before sending.
PiperOrigin-RevId: 281609112
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Equivalent to fs.GenericMountSourceOptions().
PiperOrigin-RevId: 281179287
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This should save ~200ns from switchToApp (on ptrace too). // mpratt
PiperOrigin-RevId: 281159895
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PiperOrigin-RevId: 281112758
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The tag script, when not run interactively, will fail without a provided commit
message (since it now uses annotated tags). For now, use a trivial message. In
the future, this could be extended to provide automated release notes.
PiperOrigin-RevId: 281112651
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PiperOrigin-RevId: 280763655
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