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2020-06-10Include panic message in logMichael Pratt
PiperOrigin-RevId: 315745386
2020-04-10Return EIO from p9 if sending/receiving fails.Dean Deng
Continues the modifications in cl/272963663. This prevents non-syscall errors from being propogated to kernel/task_syscall.go:ExtractErrno(), which causes a sentry panic. PiperOrigin-RevId: 305913127
2020-04-09Handle os.LinkError in p9/handlers.go.Dean Deng
PiperOrigin-RevId: 305721329
2020-04-06Add concurrency guarantees to p9 extended attribute methods.Dean Deng
PiperOrigin-RevId: 305171772
2020-04-02Avoid sending a partial dirent when the Rreaddir response exceeds message limit.Uros Prestor
PiperOrigin-RevId: 304542967
2020-02-14Un-export p9 message encode/decode functions.gVisor bot
These are not used outside of the p9 package. PiperOrigin-RevId: 295200052
2020-02-07Support listxattr and removexattr syscalls.Dean Deng
Note that these are only implemented for tmpfs, and other impls will still return EOPNOTSUPP. PiperOrigin-RevId: 293899385
2020-02-06Move p9.pool to a separate packageAndrei Vagin
PiperOrigin-RevId: 293617493
2020-01-27Standardize on tools directory.Adin Scannell
PiperOrigin-RevId: 291745021
2020-01-16Bump p9 version, adding corresponding checks to client_file.go.Dean Deng
PiperOrigin-RevId: 290145451
2020-01-16Plumb getting/setting xattrs through InodeOperations and 9p gofer interfaces.Dean Deng
There was a very bare get/setxattr in the InodeOperations interface. Add context.Context to both, size to getxattr, and flags to setxattr. Note that extended attributes are passed around as strings in this implementation, so size is automatically encoded into the value. Size is added in getxattr so that implementations can return ERANGE if a value is larger than can fit in the user-allocated buffer. This prevents us from unnecessarily passing around an arbitrarily large xattr when the user buffer is actually too small. Don't use the existing xattrwalk and xattrcreate messages and define our own, mainly for the sake of simplicity. Extended attributes will be implemented in future commits. PiperOrigin-RevId: 290121300
2020-01-09New sync package.Ian Gudger
* 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
2019-12-16Remove useless comments from p9/handlers.go.Nicolas Lacasse
These comments provided nothing, and have been copy-pasted into all implementations. The code is clear without them. I considered also removing the "handle implements handler.handle" comments, but will let those stay for now. PiperOrigin-RevId: 285876428
2019-11-20Pass OpenTruncate to gofer in Open call when opening file with O_TRUNC.Nicolas Lacasse
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
2019-11-15Do not set finalizer on p9.ClientFile.Jamie Liu
Aside from the performance hit, there is no guarantee that p9.ClientFile's finalizer runs before the associated p9.Client is closed. PiperOrigin-RevId: 280702509
2019-11-06Add p9.OpenTruncate.Jamie Liu
This is required to implement O_TRUNC correctly on filesystems backed by gofers. 9P2000.L: "lopen prepares fid for file I/O. flags contains Linux open(2) flags bits, e.g. O_RDONLY, O_RDWR, O_WRONLY." open(2): "The argument flags must include one of the following access modes: O_RDONLY, O_WRONLY, or O_RDWR. ... In addition, zero or more file creation flags and file status flags can be bitwise-or'd in flags." The reference 9P2000.L implementation also appears to expect arbitrary flags, not just access modes, in Tlopen.flags: https://github.com/chaos/diod/blob/master/diod/ops.c#L703 PiperOrigin-RevId: 278972683
2019-11-01Don't log "p9.channel.service: flipcall connection shutdown".Jamie Liu
This gets quite spammy, especially in tests. PiperOrigin-RevId: 277970468
2019-10-28Cast the Stat_t.Nlink to uint64 on arm64.Haibo Xu
Since the syscall.Stat_t.Nlink is defined as different types on amd64 and arm64(uint64 and uint32 respectively), we need to cast them to a unified uint64 type in gVisor code. Signed-off-by: Haibo Xu <haibo.xu@arm.com> Change-Id: I7542b99b195c708f3fc49b1cbe6adebdd2f6e96b
2019-10-04Return EIO from p9 if flipcall.Endpoint.Connect() fails.Jamie Liu
Also ensure that all flipcall transport errors not returned by p9 (converted to EIO by the client, or dropped on the floor by channel server goroutines) are logged. PiperOrigin-RevId: 272963663
2019-09-23Add test for concurrent reads and writes.Adin Scannell
PiperOrigin-RevId: 270789146
2019-09-19Fix p9 integration of flipcall.Jamie Liu
- Do not call Rread.SetPayload(flipcall packet window) in p9.channel.recv(). - Ignore EINTR from ppoll() in p9.Client.watch(). - Clean up handling of client socket FD lifetimes so that p9.Client.watch() never ppoll()s a closed FD. - Make p9test.Harness.Finish() call clientSocket.Shutdown() instead of clientSocket.Close() for the same reason. - Rework channel reuse to avoid leaking channels in the following case (suppose we have two channels): sendRecvChannel len(channels) == 2 => idx = 1 inuse[1] = ch0 sendRecvChannel len(channels) == 1 => idx = 0 inuse[0] = ch1 inuse[1] = nil sendRecvChannel len(channels) == 1 => idx = 0 inuse[0] = ch0 inuse[0] = nil inuse[0] == nil => ch0 leaked - Avoid deadlocking p9.Client.watch() by calling channelsWg.Wait() without holding channelsMu. - Bump p9test:client_test size to medium. PiperOrigin-RevId: 270200314
2019-09-12Update p9 to support flipcall.Adin Scannell
PiperOrigin-RevId: 268845090
2019-09-12Remove go_test from go_stateify and go_marshalMichael Pratt
They are no-ops, so the standard rule works fine. PiperOrigin-RevId: 268776264
2019-06-28Drop local_server support.Adin Scannell
PiperOrigin-RevId: 255713414
2019-06-27Fix various spelling issues in the documentationMichael Pratt
Addresses obvious typos, in the documentation only. COPYBARA_INTEGRATE_REVIEW=https://github.com/google/gvisor/pull/443 from Pixep:fix/documentation-spelling 4d0688164eafaf0b3010e5f4824b35d1e7176d65 PiperOrigin-RevId: 255477779
2019-06-21Remove O(n) lookup on unlink/renameMichael Pratt
Currently, the path tracking in the gofer involves an O(n) lookup of child fidRefs. This causes a significant overhead on unlinks in directories with lots of child fidRefs (<4k). In this transition, pathNode moves from sync.Map to normal synchronized maps. There is a small chance of contention in walk, but the lock is held for a very short time (and sync.Map also had a chance of requiring locking). OTOH, sync.Map makes it very difficult to add a fidRef reverse map. PiperOrigin-RevId: 254489952
2019-06-21Update pathNode documentation to reflect realityMichael Pratt
Neither fidRefs or children are (directly) synchronized by mu. Remove the preconditions that say so. That said, the surrounding does enforce some synchronization guarantees (e.g., fidRef.renameChildTo does not atomically replace the child in the maps). I've tried to note the need for callers to do this synchronization. I've also renamed the maps to what are (IMO) clearer names. As is, it is not obvious that pathNode.fidRefs is a map of *child* fidRefs rather than self fidRefs. PiperOrigin-RevId: 254446965
2019-06-19Add renamed children pathNodes to target parentMichael Pratt
Otherwise future renames may miss Renamed calls. PiperOrigin-RevId: 254060946
2019-06-13Update canonical repository.Adin Scannell
This can be merged after: https://github.com/google/gvisor-website/pull/77 or https://github.com/google/gvisor-website/pull/78 PiperOrigin-RevId: 253132620
2019-06-13Add p9 and unet benchmarks.Jamie Liu
PiperOrigin-RevId: 253122166
2019-05-20Forward named pipe creation to the goferMichael Pratt
The backing 9p server must allow named pipe creation, which the runsc fsgofer currently does not. There are small changes to the overlay here. GetFile may block when opening a named pipe, which can cause a deadlock: 1. open(O_RDONLY) -> copyMu.Lock() -> GetFile() 2. open(O_WRONLY) -> copyMu.Lock() -> Deadlock A named pipe usable for writing must already be on the upper filesystem, but we are still taking copyMu for write when checking for upper. That can be changed to a read lock to fix the common case. However, a named pipe on the lower filesystem would still deadlock in open(O_WRONLY) when it tries to actually perform copy up (which would simply return EINVAL). Move the copy up type check before taking copyMu for write to avoid this. p9 must be modified, as it was incorrectly removing the file mode when sending messages on the wire. PiperOrigin-RevId: 249154033 Change-Id: Id6637130e567b03758130eb6c7cdbc976384b7d6
2019-05-09Implement fallocate(2)Fabricio Voznika
Closes #225 PiperOrigin-RevId: 247508791 Change-Id: I04f47cf2770b30043e5a272aba4ba6e11d0476cc
2019-04-29Reduce memory allocations on serving pathFabricio Voznika
Cache last used messages and reuse them for subsequent requests. If more messages are needed, they are created outside the cache on demand. PiperOrigin-RevId: 245836910 Change-Id: Icf099ddff95df420db8e09f5cdd41dcdce406c61
2019-04-29Change copyright notice to "The gVisor Authors"Michael Pratt
Based on the guidelines at https://opensource.google.com/docs/releasing/authors/. 1. $ rg -l "Google LLC" | xargs sed -i 's/Google LLC.*/The gVisor Authors./' 2. Manual fixup of "Google Inc" references. 3. Add AUTHORS file. Authors may request to be added to this file. 4. Point netstack AUTHORS to gVisor AUTHORS. Drop CONTRIBUTORS. Fixes #209 PiperOrigin-RevId: 245823212 Change-Id: I64530b24ad021a7d683137459cafc510f5ee1de9
2019-04-23Remove reflection from 9P serving pathFabricio Voznika
p9.messageByType was taking 7% of p9.recv before, spending time with reflection and map lookup. Now it's reduced to 1%. PiperOrigin-RevId: 244947313 Change-Id: I42813f920557b7656f8b29157eb32acd79e11fa5
2019-02-28Fix typoMichael Pratt
PiperOrigin-RevId: 236239090 Change-Id: I92e63d6f4b52b78852626c87743fdd86175e09d3
2019-02-25Don't call WalkGetAttr for walk(names=[]).Jamie Liu
PiperOrigin-RevId: 235587729 Change-Id: I37074416b10a30ca3a00d11bcde338d8d979beaf
2019-02-19Add p9.Sticky.Jamie Liu
PiperOrigin-RevId: 234691125 Change-Id: I2a588153ded5a4fbed07bc2f0937a43ccfba791b
2019-02-15Internal change.Googler
PiperOrigin-RevId: 234237297 Change-Id: Ic9b7a37db831556d2c2cf733a6e27fba27afee0b
2019-02-15Internal change.Googler
PiperOrigin-RevId: 234169795 Change-Id: I3c576ae6ad460e2c0e3f142a2671dc18d34a07ef
2019-01-31Don't mask out sticky bit to/from goferFabricio Voznika
RELNOTES: sticky bit propagates to gofers now. PiperOrigin-RevId: 231822453 Change-Id: I73426170b9457350480a3b144a2baf937e7cb477
2019-01-31Remove license commentsMichael Pratt
Nothing reads them and they can simply get stale. Generated with: $ sed -i "s/licenses(\(.*\)).*/licenses(\1)/" **/BUILD PiperOrigin-RevId: 231818945 Change-Id: Ibc3f9838546b7e94f13f217060d31f4ada9d4bf0
2018-11-05Use correct company name in copyright headerIan Gudger
These files were added with the wrong name after all of the existing files were corrected. PiperOrigin-RevId: 220202068 Change-Id: Ia0d15233c1aa69330356a7cf16b5aa00d978e09c
2018-10-23Remove artificial name length check.Adin Scannell
This should be determined by the filesystem. PiperOrigin-RevId: 218376553 Change-Id: I55d176e2cdf8acdd6642789af057b98bb8ca25b8
2018-10-23Track paths and provide a rename hook.Adin Scannell
This change also adds extensive testing to the p9 package via mocks. The sanity checks and type checks are moved from the gofer into the core package, where they can be more easily validated. PiperOrigin-RevId: 218296768 Change-Id: I4fc3c326e7bf1e0e140a454cbacbcc6fd617ab55
2018-10-19Use correct company name in copyright headerIan Gudger
PiperOrigin-RevId: 217951017 Change-Id: Ie08bf6987f98467d07457bcf35b5f1ff6e43c035
2018-10-11Add client sanity checking for P9.Adin Scannell
This should reduce use-after-free errors and accidental close via create or remove. This change includes one functional fix as well: when closing via remove, the closed field was not set and the finalizer was not freed, so the file would have been clunked at some random point in the future. PiperOrigin-RevId: 216750000 Change-Id: Ice3292c6feb953ae97abac308afbafd2d9410402
2018-09-07Add additional sanity checks for walk.Adin Scannell
PiperOrigin-RevId: 212058684 Change-Id: I319709b9ffcfccb3231bac98df345d2a20eca24b
2018-08-13Add path sanity checks.Adin Scannell
PiperOrigin-RevId: 208527333 Change-Id: I55291bc6b8bc6b88fdd75baf899a71854c39c1a7
2018-08-08Fix error handling for bad message sizes.Adin Scannell
The message size check is legitimate: the size must be negotiated, which relies on the fixed message limit up front. Sending a message larger than that indicates that the connection is out of sync and is considered a socket error (disconnect). Similarly, sending a size that is too small indicates that the stream is out-of-sync or invalid. PiperOrigin-RevId: 207996551 Change-Id: Icd8b513d5307e9d5953dbb957ee70ceea111098d
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