Summary:
Instead of having one "Dispatcher" type that the various backend overload,
let's simply have a per-mount type dispatcher type. The previous model worked
fine when EdenFS supported only one way of mounting a repository, but with NFS
coming, unix platform will support both FUSE and NFS, making the Dispatcher
overload nonsensical.
As a behavioral change, the dispatcher lifetime and ownership is changed a bit.
It used to live for the duration of the EdenMount object, but is now tied to
the channel lifetime, as it is now owned by it.
Reviewed By: kmancini
Differential Revision: D26329477
fbshipit-source-id: 3959b90a4909e3ab0898caa308f54686f59a943c
Summary:
Since mounting EdenFS via NFS requires the same privilege as mounting EdenFS
with FUSE, let's re-use the PrivHelper infrastructure that FUSE already uses.
The macOS bit isn't yet implemented as developing on Linux is for now easier,
the mount args are also overly complicated on macOS and not well documented.
Reviewed By: fanzeyi
Differential Revision: D26255629
fbshipit-source-id: 295261dd40442fe7e0f9439c4f4c25e0d50211a3
Summary:
When NFS is enabled, we will need to have one mountd RPC program running to
be able to serve the mount requests, let's make sure that we have one by adding
it to the ServerState.
On top of the per-mount protocol setting added previously, I've also added a
global setting to make sure that we're not advertising ourself as an NFS server
before the code is more functional.
Reviewed By: genevievehelsel
Differential Revision: D26139991
fbshipit-source-id: 0d9e02618c931a0401394888ea8f3680974966b5
Summary:
The StringPiece constructor is untyped, and was only used in test. We can
afford to build the PathComponent in tests instead to avoid future headaches.
Reviewed By: genevievehelsel
Differential Revision: D25434556
fbshipit-source-id: 4b10bf2576870e81412d76c4b9755b45e26986b3
Summary:
This commit adds a new eden configuration option that
controls whether we try to load our edenfs.kext in preference to
an alternative fuse implementation on macOS.
The majority of this diff is plumbing to convey the configuration
value through to the privhelper, which is relatively restrictive
due to its root-ness.
I've also updated watchman and mercurial to be aware of the new
filesystem type that shows up in the mount table.
Reviewed By: genevievehelsel
Differential Revision: D25065462
fbshipit-source-id: 4f35b9440654298e2706a0d0613d97eb63451999
Summary:
Now that we don't ship Python 2 rpms, let's remove the build and test
targets.
Reviewed By: singhsrb, xavierd
Differential Revision: D25313325
fbshipit-source-id: 876385ccb6cb7675fef8d93978b372a3085764b0
Summary:
Mercurial is incompatible with TSAN at the moment, due to Rust/C++
compilation issues, Python multiprocess, and Tokio false positives. So
disable our HG tests when running under TSAN.
Reviewed By: fanzeyi
Differential Revision: D25109413
fbshipit-source-id: 86e51ebd287e10f92d6e3b8e7bf191e7946c709a
Summary:
This is the plumbing to allow us to skip Metadata prefetching during eden
prefetches. These can trigger a bunch of wasted network requests
when we are fetching files anyways. (These network requests are wasted since we
fetch the file contents and most of them are being throttled on sandcastle anyways.)
We won't necessarily want to skip metadata prefetching always, we will still want it
for the watchman queries, but for `eden prefetch` will probably want to skip it. This
is why we are making it an option in the GlobParams.
Reviewed By: chadaustin
Differential Revision: D24640754
fbshipit-source-id: 20db62d4c0e59fe17cb6535c86ac8f1e3877879c
Summary:
The EdenFS codebase uses folly/logging/xlog to log, but we were still relying
on glog for the various CHECK macros. Since xlog also contains equivalent CHECK
macros, let's just rely on them instead.
This is mostly codemodded + arc lint + various fixes to get it compile.
Reviewed By: chadaustin
Differential Revision: D24871174
fbshipit-source-id: 4d2a691df235d6dbd0fbd8f7c19d5a956e86b31c
Summary:
One of the issue that EdenFS on Windows is currently facing is around
invalidation during an update. In effect, EdenFS is over invalidating, which
causes update to be slower than it should be, as well as EdenFS recursively
triggering ProjectedFS callbacks during invalidation. Both of these are a
sub-par UX.
The reason this issue exist is multi-faceted. First, the update code follows
the "kPreciseInodeNumberMemory" path which enforces that a directory that is
present in the overlay needs to be invalidated, even if it isn't materialized.
The second reason is that no reclamation is done for the overlay, combine the
two and you get an update that gets both slower over time and will issue
significantly more invalidation that is needed.
Solving this is a bit involved. We could for instance start by reclaiming
inodes from the overlay, but this wouldn't be effective as we use the fact that
an inode is present in the overlay as a way to know that the file is cached in
the overlay. If we reclaim from the overlay we simply won't be invalidating
enough and some files will be out of date.
It turns out that we already have a mechanism to track what is cached by the
kernel: the fuse refcount. On Linux/macOS, everytime an inode is returned to
the kernel, this refcount incremented, and the kernel then notifies us when it
forgot about it, at which point the refcount can be decremented. On Windows,
the rules are a bit different, and a simple flag is sufficient: set when we
write a placeholder on disk (either during a directory listing, or when
ProjectedFS asks for it), and unset at invalidation time during update. There
is however a small snag in this plan. On Linux, the refcount starts at 0 when
EdenFS starts as a mount/unmount will clear all the kernel references on the
inodes. On Windows, the placeholder aren't disappearing when EdenFS dies or is
stopped, so we need a way to scan the working copy when EdenFS starts to know
which inodes should be loaded (an UnloadedInode really).
The astute reader will have noticed that this last part is effectively a
O(materialized) operation that needs to happen at startup, which would be
fairly expensive in itself. It turns out that we really don't have choice and
we need to do it regardless due to Windows not disallowing writes to the
working copy when EdenFS is stopped, and thus for EdenFS to be aware of the
actual state of the working copy, it needs to scan it at startup...
The first step in doing all of this is to simply rename the various places that
uses "fuse refcount" to "fs refcount" which is what this diff does.
Reviewed By: chadaustin
Differential Revision: D24716801
fbshipit-source-id: e9e6ccff14c454e9f2626fab23daeb3930554b1a
Summary: This merely filters out the files that don't compile on mode/win.
Reviewed By: chadaustin
Differential Revision: D24456917
fbshipit-source-id: d314ca2936e064133f2fc6a6199b38d17f2d9ef7
Summary: This can be included in all the supported platforms, thus don't #ifdef it.
Reviewed By: wez
Differential Revision: D23858664
fbshipit-source-id: e61da33a97d87cbfab5bb96d2bdaa865d2c01801
Summary:
Now that prjfs/EdenDispatcher is no longer directly tied to ProjectedFS (sort
of, this is still a bit WIP), we can move it out of the prjfs directory onto
the inodes one. This allows breaking the circular dependency cycle mentioned in
the previous diff where prjfs and inodes depend on each other.
For now, this is merely a copy/paste of the code enclosed in big #ifdef _WIN32,
we might be able to do better later, but for now this is properly good enough.
Reviewed By: wez
Differential Revision: D23857539
fbshipit-source-id: 77c620bac1656d01d7daee4dbf8b10694a589751
Summary:
Most of the non-tests callers have an ObjectFetchContext available, let's use
it instead of a static null context. This will help in understanding why some
files/trees are being fetched.
Reviewed By: chadaustin
Differential Revision: D23745752
fbshipit-source-id: b2e145d9e559bde0542adbc5b20ff56ccfc59ece
Summary: This will make it easier to build with Buck.
Reviewed By: fanzeyi
Differential Revision: D23827754
fbshipit-source-id: bf3bf4d607a08b9831f9dfea172b2e923a219561
Summary:
Now that sqliteoverlay has a TARGETS file, we can remove the manual, and use
autodeps to have the right dependencies in the TARGETS files. This will help in
getting EdenFS to build on Windows with buck.
Reviewed By: chadaustin
Differential Revision: D23820312
fbshipit-source-id: 34bfd13d2ae6d11a404a9b913562c7d45a4b3de7
Summary:
on macOS we cannot safely use `fork`.
This commit replaces the use of `fork` in the startup logger subsystem.
This was a little tricky to untangle; originally (prior to any of
the `fork` removal efforts in this diff stack), the startup flow was
to spawn a set of processes via fork:
```
edenfs (setuid)
\-----edenfs (privhelper, as root)
\------edenfs (daemonized)
```
The forked children take advantage of being able to implicitly pass state to
the child processes from the parent. That data flow needs to become explicit
when removing the fork which makes some things a little awkward.
With fork removed:
* `edenfs` unconditionally spawns `edenfs_privhelper` while it has
root privs and before most of the process has been initialized.
* That same `edenfs` process will then spawn a child `edenfs`
process which starts from scratch, but that which needs to
run as the real server instance
* The original `edenfs` instance needs to linger for a while
to remain connected to the controlling tty to pass back the
startup state to the user, before terminating.
This commit deletes the check that `edenfs` is started originally
as root; previously the logic relied on the forked startup logger
continuing past the `daemonizeIfRequested` call and simply deferring
the check until after folly::init. With these changes we can't
easily perform such a check without adding some extra gymnastics
to pass the state around; the place where that is checked is in
the spawned child of the original edenfs, which is not a privileged
process and doesn't know the original euid. I don't believe this
to be a great loss as we tuck `edenfs` away under the libexec dir.
Reviewed By: chadaustin
Differential Revision: D23696569
fbshipit-source-id: 55b95daf022601a4699274d696af419f0a11f6f2
Summary:
This commit moves a compile-time template parameter
to be a runtime boolean parameter.
There's a bit of fan-out that, while I don't think it is
super awesome, isn't super terrible either.
The case sensitivity value is read from the checkout config
added in the prior diff in this stack.
Reviewed By: xavierd
Differential Revision: D23751192
fbshipit-source-id: 46f6fe25bfa6666305096ad9c416b510cd3aac8f
Summary:
Since the Stub.h now only contains NOT_IMPLEMENTED, let's move it to its own
header outside of the win directory.
Reviewed By: genevievehelsel
Differential Revision: D23696244
fbshipit-source-id: 2dfc3204707e043ee6c89595668c484e0fa8c0d0
Summary:
Most of the RequestData code is platform generic, but bits of it are currently
strongly tied to FUSE. By splitting these 2 parts, we will be able to use the
RequestContext class in Windows too and not having to re-implement all the
logic there.
Reviewed By: chadaustin
Differential Revision: D23482072
fbshipit-source-id: 857fd9ca4264d0f308ec10cc487e9ff3eeb5ee16
Summary:
None of these were used, let's remove them.
ps: I thought we had a system to detect unused headers and lint about them?
Reviewed By: chadaustin
Differential Revision: D23465783
fbshipit-source-id: c21a34c9838db29f4fd0057d3be4e0fcb527cd6d
Summary: This file is not fuse specific, therefore, let's move it to a non-fuse folder.
Reviewed By: chadaustin
Differential Revision: D23464460
fbshipit-source-id: f70e94bb0ecc37bd74798fd230dee2058484f31b
Summary:
This commit introduces a new process spawning class derived
from the ChildProcess class in the watchman codebase.
`SpawnedProcess` is similar to folly::Subprocess but is designed around the
idea that we will use a system provided spawning API to start a process, rather
than assuming the use of `fork`.
`fork` is to be avoided because it can be expensive for processes with large
address spaces and also because it interacts poorly with threads on macOS. In
particular, we see the objC runtime terminating our process in some scenarios
where fork and threads are mixed.
There are some important differences from `folly::Subprocess` and that means
that some assumptions and uses need to be altered slightly from their prior
workings. For example, detaching a SpawnedProcess moves the responsibility of
waiting on the child to a periodic task as there is no way to detach via
posix_spawn without also using fork.
On the plus side, this commit allows unifying spawning between posix and
windows systems, which simplifies the code!
Reviewed By: xavierd
Differential Revision: D23287763
fbshipit-source-id: b662af1d7eaaa9ed445c42f6c5765ae9af975eea
Summary:
Scuba logging that tracks undesired file fetches has some blind spots i.e. a
lot of fetches have null pid and null cmd line. This diff tries to fix another
part of the problem.
TreeInode::getOrLoadChild() has TODO `pass a fetch context down through
getOrLoadChild to track this load`. This diff fixes this TODO, and also starts
to pass context from EdenDispatcher:lookup method.
Note that it adds quite a lot of new `ObjectFetchContext::getNullContext()`
calls, and potentially those might be responsible for blind spots in logging.
I'll try to address this problem in the next diffs.
Reviewed By: kmancini
Differential Revision: D23418218
fbshipit-source-id: 319d7436494d8dce3580289aae9963aa13bfc191
Summary:
Enabling hg dynamicconfigs in D23309090 (d643f48c8c) changed the output of `hg
manifest --debug` and broke HgImportTest. Set TESTTMP to avoid
production configs.
Reviewed By: DurhamG
Differential Revision: D23335847
fbshipit-source-id: 7ffd0394aa7a8466b266000b18f8742ed4a6b53f
Summary:
Setting up, tearing down, and querying RequestContext has some
overhead that I would like to avoid in the inner FUSE loop, so replace
RequestData with a single class that's heap-allocated at the start of
a request and is guaranteed to survive until the request ends, and is
otherwise explicitly passed where it's needed.
Reviewed By: kmancini
Differential Revision: D22712310
fbshipit-source-id: fc30d0b0f7e22b39306b857194ea07a913110b0f
Summary:
Up to now, Windows had to have its own version of folly::{readFile, writeFile,
writeFileAtomic} as these only operate on `char *` path, which can only
represent ascii paths on Windows. Since the Windows version is slightly
different from folly, this forced the code to either ifdef _WIN32, or use the
folly version pretending that it would be OK. The Windows version was also
behaving slightly differently from folly. For instance, where folly would
return a boolean to indicate success, on Windows we would throw an exception.
To simplify our code, add type safety and unify both, we can implement our own
wrappers on top of either folly or Windows APIs.
We still have some code that uses folly::readFile but these should only be
dealing with filedescriptors. As a following step, we may want to have our own
File class that wraps a file descriptor/HANDLE so we can completely remove all
uses of folly::readFile.
Reviewed By: wez
Differential Revision: D23037325
fbshipit-source-id: 2b9a026f3ee6220ef55097abe649b23e38d9fe91
Summary:
The StringConv.h header contains many functions to convert from Windows paths
to Eden's path (and vice versa) to workaround the fact that Eden's path don't
support wide strings that Windows uses. Let's simply add support for these wide
strings in PathFuncs so we can greatly simplify all the call sites. Instead of
calling "edenToWinName(winstr)", "PathComponent(winstr)" is both more
descriptive and more idiomatic.
To be fair, I'm not entirely a fan of the approach taken in this diff, as this
adds Windows specific code to PathFuncs.h, but I feel that the benefit is too
big to not do that.
Reviewed By: chadaustin
Differential Revision: D23004523
fbshipit-source-id: 3a1507e398a66909773251907db01e06603b91dd
Summary:
Avoid the cost of dynamically querying whether we are in a FUSE
request handler or not by passing a flag.
Reviewed By: kmancini
Differential Revision: D22710480
fbshipit-source-id: 010bb8efee8074441aa20aab0eb12277452c5252
Summary:
Avoid the cost of dynamically querying whether we are in a FUSE
request handler or not by passing a flag.
Reviewed By: kmancini
Differential Revision: D22710452
fbshipit-source-id: 818035b72b793fa895147d9df3bb668d5b9c55f3
Summary:
Avoid the cost of dynamically querying whether we are in a FUSE
request handler or not by passing a flag.
Reviewed By: kmancini
Differential Revision: D22710422
fbshipit-source-id: 65b0737ad5f8ca74d12f2c657691d3751df4aa54
Summary:
Avoid the cost of dynamically querying whether we are in a FUSE
request handler or not by passing a flag.
Reviewed By: genevievehelsel
Differential Revision: D22710397
fbshipit-source-id: 7c62f45dfc227416c91070842a349b9d0c626cba
Summary:
Futures are intended to be chained together and not synchronously waited one
after the other. While this may be one of the goal, it also paves the way to
enable ProjectedFS asynchronous notification handling.
While doing this, a bunch of code was moved from EdenMount.cpp to the
dispatcher itself, the rationale behind this is to follow what the unix
EdenDispacher with the long term plan to merge the 2 as much as possible.
Reviewed By: wez
Differential Revision: D22361750
fbshipit-source-id: fa679a8b94ff6f8b5a33782fdb6b129ab066c4d8
Summary: Previously, `BackingStore` and all its sub-classes' `getBlob` and `getTree` methods accepted both `ObjectFetchContext` and `ImportPriority` as arguments. Now, `ImportPriority` is removed because we can get the priority from `ObjectFetchContext `
Reviewed By: kmancini
Differential Revision: D22650629
fbshipit-source-id: e1b0c57a059f11504b28b2c17d698bb58f51e1ee
Summary:
We are unifying C++ APIs for accessing optional and unqualified fields:
https://fb.workplace.com/groups/1730279463893632/permalink/2541675446087359/.
This diff migrates code from accessing data members generated from unqualified
Thrift fields directly to the `field_ref` API, i.e. replacing
```
thrift_obj.field
```
with
```
*thrift_obj.field_ref()
```
The `_ref` suffixes will be removed in the future once data members are private
and names can be reclaimed.
The output of this codemod has been reviewed in D20039637.
The new API is documented in
https://our.intern.facebook.com/intern/wiki/Thrift/FieldAccess/.
drop-conflicts
Reviewed By: yfeldblum
Differential Revision: D22631599
fbshipit-source-id: 9bfcaeb636f34a32fd871c7cd6a2db4a7ace30bf
Summary:
The WinStore was only used for 2 simple things: checking that a file is
present, and getting its blob. Since both of these are trivial to implement
with EdenMount, there is no reason for WinStore to exist.
Reviewed By: chadaustin
Differential Revision: D22288430
fbshipit-source-id: 90567ac39b5124039becd3599766fcd0cde3e9aa
Summary:
This will allow adding custom MetadataImporters in different eden builds.
DefaultMetadataImporter provides a no-op version of the interface to be
used by default.
Reviewed By: chadaustin
Differential Revision: D21960834
fbshipit-source-id: aec8a3627ab1223f74466b92a0ebe3290b67b7ed
Summary: This diff defines `Overlaychecker::ProgressCallback` to replace repetitive function type declaration.
Reviewed By: genevievehelsel
Differential Revision: D22243160
fbshipit-source-id: ea05e451817a760b5266879b956eaea48dc8d85e
Summary: This diff made fetch threshold configurable, so we can change it later as repository size grows.
Reviewed By: fanzeyi
Differential Revision: D22337850
fbshipit-source-id: 4b46420cb4e7164a3f1080279d67fa5f90549cd8
Summary: This diff updated `ObjectStore` to send a `FetchHeavy` event to Scuba when the number of fetching requests of a process has reached 2000.
Reviewed By: fanzeyi
Differential Revision: D22292104
fbshipit-source-id: b7ac48412868216ea960c8681a5fb71c587952bc
Summary:
Recently the server team added an un-used directory to test that eden would not
fetch these as a test for the upcoming repo merge. They saw that these files
were fetched a non trivial number of times. We want to know why eden is causing
these fetches.
This adds the pid and interface through which the client is interacting with eden to
ObjectFetchContext for this purpose. This information will be logged in later
changes.
note: currently this is only for fetches through Fuse (thrift interface to follow).
Reviewed By: chadaustin
Differential Revision: D22050919
fbshipit-source-id: 49b93257a0e6d910f48b1e8ec6471527e056d22a
Summary:
This passes ObjectFetchContext into the backing store to prepare for adding
logging for the cause of server fetches.
In following changes I will add logging in the HgQueuedBackingStore.
Ultimately we will want to move this logging to be closer to the data fetching
(in HgDatapackStore and HgImporter), but I plan to temporarily add logging to
the HgQueuedBackingStore to simplify so that we can more quickly roll out.
Reviewed By: chadaustin
Differential Revision: D22022992
fbshipit-source-id: ccb428458cbf7a1e33aaf9be9d0d766c45acedb3
Summary:
In following changes I will be threading ObjectFetchContext into the backing
store importing process, since this will start to be used more outside of the
ObjectStore, I am moving this class into its own files.
Reviewed By: chadaustin
Differential Revision: D22022488
fbshipit-source-id: 1a291fea6e0fd56855936962363dfc9f6de8533d
Summary:
This diff makes `lookup` to use `RequestData` as `ObjectFetchContext` in `getattr` calls.
This will make sure we correctly record backing store fetches in `eden top`
Reviewed By: chadaustin
Differential Revision: D21780969
fbshipit-source-id: 468e2fadcebf4a00477bc5de434e6c658b99d1ce
Summary: This diff makes `InodeBase::stat()` to be able to accept `ObjectFetchContext` as a parameter.
Reviewed By: chadaustin
Differential Revision: D21780883
fbshipit-source-id: 9b1db2e2268cb98663bcf902ea61897da593ea05
Summary: This diff passes a callback function `progressCallback` from `EdenServer` to make `OverlayChekcer` print fsck messages to stdout.
Reviewed By: fanzeyi
Differential Revision: D21966060
fbshipit-source-id: 317b2c8954c718b51b5295c9f8d7698eb203906e
