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12 Commits

Author SHA1 Message Date
Jamie Liu 9b5e305e05 Remove filesystem structure from vfs.Dentry. 
This change:

- Drastically simplifies the synchronization model: filesystem structure is
  both implementation-defined and implementation-synchronized.

- Allows implementations of vfs.DentryImpl to use implementation-specific
  dentry types, reducing casts during path traversal.

- Doesn't require dentries representing non-directory files to waste space on a
  map of children.

- Allows dentry revalidation and mount lookup to be correctly ordered (fixed
  FIXME in fsimpl/gofer/filesystem.go).

- Removes the need to have two separate maps in gofer.dentry
  (dentry.vfsd.children and dentry.negativeChildren) for positive and negative
  lookups respectively.

//pkg/sentry/fsimpl/tmpfs/benchmark_test.go:
name                        old time/op  new time/op  delta
VFS2TmpfsStat/1-112          172ns ± 4%   165ns ± 3%   -4.08%  (p=0.002 n=9+9)
VFS2TmpfsStat/2-112          199ns ± 3%   195ns ±10%     ~     (p=0.132 n=8+9)
VFS2TmpfsStat/3-112          230ns ± 2%   216ns ± 2%   -6.15%  (p=0.000 n=8+8)
VFS2TmpfsStat/8-112          390ns ± 2%   358ns ± 4%   -8.33%  (p=0.000 n=9+8)
VFS2TmpfsStat/64-112        2.20µs ± 3%  2.01µs ± 3%   -8.48%  (p=0.000 n=10+8)
VFS2TmpfsStat/100-112       3.42µs ± 9%  3.08µs ± 2%   -9.82%  (p=0.000 n=9+8)
VFS2TmpfsMountStat/1-112     278ns ± 1%   286ns ±15%     ~     (p=0.712 n=8+10)
VFS2TmpfsMountStat/2-112     311ns ± 4%   298ns ± 2%   -4.27%  (p=0.000 n=9+8)
VFS2TmpfsMountStat/3-112     339ns ± 3%   330ns ± 9%     ~     (p=0.070 n=8+9)
VFS2TmpfsMountStat/8-112     503ns ± 3%   466ns ± 3%   -7.38%  (p=0.000 n=8+8)
VFS2TmpfsMountStat/64-112   2.53µs ±16%  2.17µs ± 7%  -14.19%  (p=0.000 n=10+9)
VFS2TmpfsMountStat/100-112  3.60µs ± 4%  3.30µs ± 8%   -8.33%  (p=0.001 n=8+9)

Updates #1035

PiperOrigin-RevId: 307655892
 2020-04-21 12:18:07 -07:00
Dean Deng 09ddb5a426 Port extended attributes to VFS2. 
As in VFS1, we only support the user.* namespace. Plumbing is added to tmpfs
and goferfs.
Note that because of the slightly different order of checks between VFS2 and
Linux, one of the xattr tests needs to be relaxed slightly.

Fixes #2363.

PiperOrigin-RevId: 305985121
 2020-04-10 19:02:55 -07:00
Dean Deng 00d9776a4b Add socket files to tmpfs VFS2. 
Updates #1476.

PiperOrigin-RevId: 305024274
 2020-04-06 07:31:27 -07:00
Dean Deng 76a7ace751 Add BoundEndpointAt filesystem operation. 
BoundEndpointAt() is needed to support Unix sockets bound at a
file path, corresponding to BoundEndpoint() in VFS1.

Updates #1476.

PiperOrigin-RevId: 303258251
 2020-03-26 21:52:24 -07:00
Dean Deng 6c3072243d Implement file locks for regular tmpfs files in VFSv2. 
Add a file lock implementation that can be embedded into various filesystem
implementations.

Updates #1480

PiperOrigin-RevId: 292614758
 2020-01-31 14:15:41 -08:00
Jamie Liu 2862b0b1be Add //pkg/sentry/fsimpl/devtmpfs. 
PiperOrigin-RevId: 292021389
 2020-01-28 15:05:24 -08:00
Adin Scannell 0e2f1b7abd Update package locations. 
Because the abi will depend on the core types for marshalling (usermem,
context, safemem, safecopy), these need to be flattened from the sentry
directory. These packages contain no sentry-specific details.

PiperOrigin-RevId: 291811289
 2020-01-27 15:31:32 -08:00
Adin Scannell d29e59af9f Standardize on tools directory. 
PiperOrigin-RevId: 291745021
 2020-01-27 12:21:00 -08:00
Jamie Liu 18a7e1309d Add support for device special files to VFS2 tmpfs. 
PiperOrigin-RevId: 291471892
 2020-01-24 17:07:54 -08:00
Nicolas Lacasse d6fb1ec6c7 Add timestamps to VFS2 tmpfs, and implement some of SetStat. 
PiperOrigin-RevId: 289962040
 2020-01-15 16:32:55 -08:00
Ian Gudger 27500d529f New sync package. 
* Rename syncutil to sync.
* Add aliases to sync types.
* Replace existing usage of standard library sync package.

This will make it easier to swap out synchronization primitives. For example,
this will allow us to use primitives from github.com/sasha-s/go-deadlock to
check for lock ordering violations.

Updates #1472

PiperOrigin-RevId: 289033387
 2020-01-09 22:02:24 -08:00
Nicolas Lacasse 51f3ab85e0 Convert memfs into proto-tmpfs. 
- Renamed memfs to tmpfs.
- Copied fileRangeSet bits from fs/fsutil/ to fsimpl/tmpfs/
- Changed tmpfs to be backed by filemem instead of byte slice.
- regularFileReadWriter uses a sync.Pool, similar to gofer client.

PiperOrigin-RevId: 288356380
 2020-01-06 12:52:55 -08:00