rhg: parallellize computation of [unsure_is_modified]

[unsure_is_modified] is called for every file for which we can't
determine its status based on its size and mtime alone.

In particular, this happens if the mtime of the file changes
without its contents changing.

Parallellizing this improves performance significantly when
we have many of these files.

Here's an example run (on a repo with ~400k files after dropping FS caches)

```
before:
real	0m53.901s
user	0m27.806s
sys	0m31.325s

after:
real	0m32.017s
user	0m34.277s
sys	1m26.250s
```

Another example run (a different FS):

```
before:
real	3m28.479s
user	0m31.800s
sys	0m25.324s

after:
real	0m29.751s
user	0m41.814s
sys	1m15.387s
```

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rust/hg-core/src/revlog/filelog.rs

@@ -1,205 +1,208 b''
 use crate::errors::HgError;
 use crate::repo::Repo;
 use crate::revlog::path_encode::path_encode;
 use crate::revlog::revlog::RevlogEntry;
 use crate::revlog::revlog::{Revlog, RevlogError};
 use crate::revlog::NodePrefix;
 use crate::revlog::Revision;
 use crate::utils::files::get_path_from_bytes;
 use crate::utils::hg_path::HgPath;
 use crate::utils::SliceExt;
 use std::path::PathBuf;
 
 /// A specialized `Revlog` to work with file data logs.
 pub struct Filelog {
     /// The generic `revlog` format.
     revlog: Revlog,
 }
 
 impl Filelog {
-    pub fn open(repo: &Repo, file_path: &HgPath) -> Result<Self, HgError> {
+    pub fn open_vfs(
+        store_vfs: &crate::vfs::Vfs<'_>,
+        file_path: &HgPath,
+    ) -> Result<Self, HgError> {
         let index_path = store_path(file_path, b".i");
         let data_path = store_path(file_path, b".d");
-        let revlog = Revlog::open(
-            &repo.store_vfs(),
-            index_path,
-            Some(&data_path),
-            false,
-        )?;
+        let revlog =
+            Revlog::open(store_vfs, index_path, Some(&data_path), false)?;
         Ok(Self { revlog })
     }
 
+    pub fn open(repo: &Repo, file_path: &HgPath) -> Result<Self, HgError> {
+        Self::open_vfs(&repo.store_vfs(), file_path)
+    }
+
     /// The given node ID is that of the file as found in a filelog, not of a
     /// changeset.
     pub fn data_for_node(
         &self,
         file_node: impl Into<NodePrefix>,
     ) -> Result<FilelogRevisionData, RevlogError> {
         let file_rev = self.revlog.rev_from_node(file_node.into())?;
         self.data_for_rev(file_rev)
     }
 
     /// The given revision is that of the file as found in a filelog, not of a
     /// changeset.
     pub fn data_for_rev(
         &self,
         file_rev: Revision,
     ) -> Result<FilelogRevisionData, RevlogError> {
         let data: Vec<u8> = self.revlog.get_rev_data(file_rev)?.into_owned();
         Ok(FilelogRevisionData(data.into()))
     }
 
     /// The given node ID is that of the file as found in a filelog, not of a
     /// changeset.
     pub fn entry_for_node(
         &self,
         file_node: impl Into<NodePrefix>,
     ) -> Result<FilelogEntry, RevlogError> {
         let file_rev = self.revlog.rev_from_node(file_node.into())?;
         self.entry_for_rev(file_rev)
     }
 
     /// The given revision is that of the file as found in a filelog, not of a
     /// changeset.
     pub fn entry_for_rev(
         &self,
         file_rev: Revision,
     ) -> Result<FilelogEntry, RevlogError> {
         Ok(FilelogEntry(self.revlog.get_entry(file_rev)?))
     }
 }
 
 fn store_path(hg_path: &HgPath, suffix: &[u8]) -> PathBuf {
     let encoded_bytes =
         path_encode(&[b"data/", hg_path.as_bytes(), suffix].concat());
     get_path_from_bytes(&encoded_bytes).into()
 }
 
 pub struct FilelogEntry<'a>(RevlogEntry<'a>);
 
 impl FilelogEntry<'_> {
     /// `self.data()` can be expensive, with decompression and delta
     /// resolution.
     ///
     /// *Without* paying this cost, based on revlog index information
     /// including `RevlogEntry::uncompressed_len`:
     ///
     /// * Returns `true` if the length that `self.data().file_data().len()`
     ///   would return is definitely **not equal** to `other_len`.
     /// * Returns `false` if available information is inconclusive.
     pub fn file_data_len_not_equal_to(&self, other_len: u64) -> bool {
         // Relevant code that implement this behavior in Python code:
         // basefilectx.cmp, filelog.size, storageutil.filerevisioncopied,
         // revlog.size, revlog.rawsize
 
         // Let’s call `file_data_len` what would be returned by
         // `self.data().file_data().len()`.
 
         if self.0.is_censored() {
             let file_data_len = 0;
             return other_len != file_data_len;
         }
 
         if self.0.has_length_affecting_flag_processor() {
             // We can’t conclude anything about `file_data_len`.
             return false;
         }
 
         // Revlog revisions (usually) have metadata for the size of
         // their data after decompression and delta resolution
         // as would be returned by `Revlog::get_rev_data`.
         //
         // For filelogs this is the file’s contents preceded by an optional
         // metadata block.
         let uncompressed_len = if let Some(l) = self.0.uncompressed_len() {
             l as u64
         } else {
             // The field was set to -1, the actual uncompressed len is unknown.
             // We need to decompress to say more.
             return false;
         };
         // `uncompressed_len = file_data_len + optional_metadata_len`,
         // so `file_data_len <= uncompressed_len`.
         if uncompressed_len < other_len {
             // Transitively, `file_data_len < other_len`.
             // So `other_len != file_data_len` definitely.
             return true;
         }
 
         if uncompressed_len == other_len + 4 {
             // It’s possible that `file_data_len == other_len` with an empty
             // metadata block (2 start marker bytes + 2 end marker bytes).
             // This happens when there wouldn’t otherwise be metadata, but
             // the first 2 bytes of file data happen to match a start marker
             // and would be ambiguous.
             return false;
         }
 
         if !self.0.has_p1() {
             // There may or may not be copy metadata, so we can’t deduce more
             // about `file_data_len` without computing file data.
             return false;
         }
 
         // Filelog ancestry is not meaningful in the way changelog ancestry is.
         // It only provides hints to delta generation.
         // p1 and p2 are set to null when making a copy or rename since
         // contents are likely unrelatedto what might have previously existed
         // at the destination path.
         //
         // Conversely, since here p1 is non-null, there is no copy metadata.
         // Note that this reasoning may be invalidated in the presence of
         // merges made by some previous versions of Mercurial that
         // swapped p1 and p2. See <https://bz.mercurial-scm.org/show_bug.cgi?id=6528>
         // and `tests/test-issue6528.t`.
         //
         // Since copy metadata is currently the only kind of metadata
         // kept in revlog data of filelogs,
         // this `FilelogEntry` does not have such metadata:
         let file_data_len = uncompressed_len;
 
         return file_data_len != other_len;
     }
 
     pub fn data(&self) -> Result<FilelogRevisionData, HgError> {
         Ok(FilelogRevisionData(self.0.data()?.into_owned()))
     }
 }
 
 /// The data for one revision in a filelog, uncompressed and delta-resolved.
 pub struct FilelogRevisionData(Vec<u8>);
 
 impl FilelogRevisionData {
     /// Split into metadata and data
     pub fn split(&self) -> Result<(Option<&[u8]>, &[u8]), HgError> {
         const DELIMITER: &[u8; 2] = &[b'\x01', b'\n'];
 
         if let Some(rest) = self.0.drop_prefix(DELIMITER) {
             if let Some((metadata, data)) = rest.split_2_by_slice(DELIMITER) {
                 Ok((Some(metadata), data))
             } else {
                 Err(HgError::corrupted(
                     "Missing metadata end delimiter in filelog entry",
                 ))
             }
         } else {
             Ok((None, &self.0))
         }
     }
 
     /// Returns the file contents at this revision, stripped of any metadata
     pub fn file_data(&self) -> Result<&[u8], HgError> {
         let (_metadata, data) = self.split()?;
         Ok(data)
     }
 
     /// Consume the entry, and convert it into data, discarding any metadata,
     /// if present.
     pub fn into_file_data(self) -> Result<Vec<u8>, HgError> {
         if let (Some(_metadata), data) = self.split()? {
             Ok(data.to_owned())
         } else {
             Ok(self.0)
         }
     }
 }

rust/hg-core/src/sparse.rs

@@ -1,338 +1,338 b''
 use std::{collections::HashSet, path::Path};
 
 use format_bytes::{write_bytes, DisplayBytes};
 
 use crate::{
     errors::HgError,
     filepatterns::parse_pattern_file_contents,
     matchers::{
         AlwaysMatcher, DifferenceMatcher, IncludeMatcher, Matcher,
         UnionMatcher,
     },
     operations::cat,
     repo::Repo,
     requirements::SPARSE_REQUIREMENT,
     utils::{hg_path::HgPath, SliceExt},
     IgnorePattern, PatternError, PatternFileWarning, PatternSyntax, Revision,
     NULL_REVISION,
 };
 
 /// Command which is triggering the config read
 #[derive(Copy, Clone, Debug)]
 pub enum SparseConfigContext {
     Sparse,
     Narrow,
 }
 
 impl DisplayBytes for SparseConfigContext {
     fn display_bytes(
         &self,
         output: &mut dyn std::io::Write,
     ) -> std::io::Result<()> {
         match self {
             SparseConfigContext::Sparse => write_bytes!(output, b"sparse"),
             SparseConfigContext::Narrow => write_bytes!(output, b"narrow"),
         }
     }
 }
 
 /// Possible warnings when reading sparse configuration
 #[derive(Debug, derive_more::From)]
 pub enum SparseWarning {
     /// Warns about improper paths that start with "/"
     RootWarning {
         context: SparseConfigContext,
         line: Vec<u8>,
     },
     /// Warns about a profile missing from the given changelog revision
     ProfileNotFound { profile: Vec<u8>, rev: Revision },
     #[from]
     Pattern(PatternFileWarning),
 }
 
 /// Parsed sparse config
 #[derive(Debug, Default)]
 pub struct SparseConfig {
     // Line-separated
     pub(crate) includes: Vec<u8>,
     // Line-separated
     pub(crate) excludes: Vec<u8>,
     pub(crate) profiles: HashSet<Vec<u8>>,
     pub(crate) warnings: Vec<SparseWarning>,
 }
 
 /// All possible errors when reading sparse/narrow config
 #[derive(Debug, derive_more::From)]
 pub enum SparseConfigError {
     IncludesAfterExcludes {
         context: SparseConfigContext,
     },
     EntryOutsideSection {
         context: SparseConfigContext,
         line: Vec<u8>,
     },
     /// Narrow config does not support '%include' directives
     IncludesInNarrow,
     /// An invalid pattern prefix was given to the narrow spec. Includes the
     /// entire pattern for context.
     InvalidNarrowPrefix(Vec<u8>),
     #[from]
     HgError(HgError),
     #[from]
     PatternError(PatternError),
 }
 
 /// Parse sparse config file content.
 pub(crate) fn parse_config(
     raw: &[u8],
     context: SparseConfigContext,
 ) -> Result<SparseConfig, SparseConfigError> {
     let mut includes = vec![];
     let mut excludes = vec![];
     let mut profiles = HashSet::new();
     let mut warnings = vec![];
 
     #[derive(PartialEq, Eq)]
     enum Current {
         Includes,
         Excludes,
         None,
-    };
+    }
 
     let mut current = Current::None;
     let mut in_section = false;
 
     for line in raw.split(|c| *c == b'\n') {
         let line = line.trim();
         if line.is_empty() || line[0] == b'#' {
             // empty or comment line, skip
             continue;
         }
         if line.starts_with(b"%include ") {
             let profile = line[b"%include ".len()..].trim();
             if !profile.is_empty() {
                 profiles.insert(profile.into());
             }
         } else if line == b"[include]" {
             if in_section && current == Current::Includes {
                 return Err(SparseConfigError::IncludesAfterExcludes {
                     context,
                 });
             }
             in_section = true;
             current = Current::Includes;
             continue;
         } else if line == b"[exclude]" {
             in_section = true;
             current = Current::Excludes;
         } else {
             if current == Current::None {
                 return Err(SparseConfigError::EntryOutsideSection {
                     context,
                     line: line.into(),
                 });
             }
             if line.trim().starts_with(b"/") {
                 warnings.push(SparseWarning::RootWarning {
                     context,
                     line: line.into(),
                 });
                 continue;
             }
             match current {
                 Current::Includes => {
                     includes.push(b'\n');
                     includes.extend(line.iter());
                 }
                 Current::Excludes => {
                     excludes.push(b'\n');
                     excludes.extend(line.iter());
                 }
                 Current::None => unreachable!(),
             }
         }
     }
 
     Ok(SparseConfig {
         includes,
         excludes,
         profiles,
         warnings,
     })
 }
 
 fn read_temporary_includes(
     repo: &Repo,
 ) -> Result<Vec<Vec<u8>>, SparseConfigError> {
     let raw = repo.hg_vfs().try_read("tempsparse")?.unwrap_or(vec![]);
     if raw.is_empty() {
         return Ok(vec![]);
     }
     Ok(raw.split(|c| *c == b'\n').map(ToOwned::to_owned).collect())
 }
 
 /// Obtain sparse checkout patterns for the given revision
 fn patterns_for_rev(
     repo: &Repo,
     rev: Revision,
 ) -> Result<Option<SparseConfig>, SparseConfigError> {
     if !repo.has_sparse() {
         return Ok(None);
     }
     let raw = repo.hg_vfs().try_read("sparse")?.unwrap_or(vec![]);
 
     if raw.is_empty() {
         return Ok(None);
     }
 
     let mut config = parse_config(&raw, SparseConfigContext::Sparse)?;
 
     if !config.profiles.is_empty() {
         let mut profiles: Vec<Vec<u8>> = config.profiles.into_iter().collect();
         let mut visited = HashSet::new();
 
         while let Some(profile) = profiles.pop() {
             if visited.contains(&profile) {
                 continue;
             }
             visited.insert(profile.to_owned());
 
             let output =
                 cat(repo, &rev.to_string(), vec![HgPath::new(&profile)])
                     .map_err(|_| {
                         HgError::corrupted(format!(
                             "dirstate points to non-existent parent node"
                         ))
                     })?;
             if output.results.is_empty() {
                 config.warnings.push(SparseWarning::ProfileNotFound {
                     profile: profile.to_owned(),
                     rev,
                 })
             }
 
             let subconfig = parse_config(
                 &output.results[0].1,
                 SparseConfigContext::Sparse,
             )?;
             if !subconfig.includes.is_empty() {
                 config.includes.push(b'\n');
                 config.includes.extend(&subconfig.includes);
             }
             if !subconfig.includes.is_empty() {
                 config.includes.push(b'\n');
                 config.excludes.extend(&subconfig.excludes);
             }
             config.warnings.extend(subconfig.warnings.into_iter());
             profiles.extend(subconfig.profiles.into_iter());
         }
 
         config.profiles = visited;
     }
 
     if !config.includes.is_empty() {
         config.includes.extend(b"\n.hg*");
     }
 
     Ok(Some(config))
 }
 
 /// Obtain a matcher for sparse working directories.
 pub fn matcher(
     repo: &Repo,
 ) -> Result<(Box<dyn Matcher + Sync>, Vec<SparseWarning>), SparseConfigError> {
     let mut warnings = vec![];
     if !repo.requirements().contains(SPARSE_REQUIREMENT) {
         return Ok((Box::new(AlwaysMatcher), warnings));
     }
 
     let parents = repo.dirstate_parents()?;
     let mut revs = vec![];
     let p1_rev =
         repo.changelog()?
             .rev_from_node(parents.p1.into())
             .map_err(|_| {
                 HgError::corrupted(format!(
                     "dirstate points to non-existent parent node"
                 ))
             })?;
     if p1_rev != NULL_REVISION {
         revs.push(p1_rev)
     }
     let p2_rev =
         repo.changelog()?
             .rev_from_node(parents.p2.into())
             .map_err(|_| {
                 HgError::corrupted(format!(
                     "dirstate points to non-existent parent node"
                 ))
             })?;
     if p2_rev != NULL_REVISION {
         revs.push(p2_rev)
     }
     let mut matchers = vec![];
 
     for rev in revs.iter() {
         let config = patterns_for_rev(repo, *rev);
         if let Ok(Some(config)) = config {
             warnings.extend(config.warnings);
             let mut m: Box<dyn Matcher + Sync> = Box::new(AlwaysMatcher);
             if !config.includes.is_empty() {
                 let (patterns, subwarnings) = parse_pattern_file_contents(
                     &config.includes,
                     Path::new(""),
                     Some(b"relglob:".as_ref()),
                     false,
                 )?;
                 warnings.extend(subwarnings.into_iter().map(From::from));
                 m = Box::new(IncludeMatcher::new(patterns)?);
             }
             if !config.excludes.is_empty() {
                 let (patterns, subwarnings) = parse_pattern_file_contents(
                     &config.excludes,
                     Path::new(""),
                     Some(b"relglob:".as_ref()),
                     false,
                 )?;
                 warnings.extend(subwarnings.into_iter().map(From::from));
                 m = Box::new(DifferenceMatcher::new(
                     m,
                     Box::new(IncludeMatcher::new(patterns)?),
                 ));
             }
             matchers.push(m);
         }
     }
     let result: Box<dyn Matcher + Sync> = match matchers.len() {
         0 => Box::new(AlwaysMatcher),
         1 => matchers.pop().expect("1 is equal to 0"),
         _ => Box::new(UnionMatcher::new(matchers)),
     };
 
     let matcher =
         force_include_matcher(result, &read_temporary_includes(repo)?)?;
     Ok((matcher, warnings))
 }
 
 /// Returns a matcher that returns true for any of the forced includes before
 /// testing against the actual matcher
 fn force_include_matcher(
     result: Box<dyn Matcher + Sync>,
     temp_includes: &[Vec<u8>],
 ) -> Result<Box<dyn Matcher + Sync>, PatternError> {
     if temp_includes.is_empty() {
         return Ok(result);
     }
     let forced_include_matcher = IncludeMatcher::new(
         temp_includes
             .into_iter()
             .map(|include| {
                 IgnorePattern::new(PatternSyntax::Path, include, Path::new(""))
             })
             .collect(),
     )?;
     Ok(Box::new(UnionMatcher::new(vec![
         Box::new(forced_include_matcher),
         result,
     ])))
 }

rust/rhg/Cargo.toml

@@ -1,24 +1,25 b''
 [package]
 name = "rhg"
 version = "0.1.0"
 authors = [
     "Antoine Cezar <[e-mail]>",
     "Raphaël Gomès <[e-mail]>",
 ]
 edition = "2018"
 
 [dependencies]
 atty = "0.2.14"
 hg-core = { path = "../hg-core"}
 chrono = "0.4.19"
 clap = "2.34.0"
 derive_more = "0.99.17"
 home = "0.5.3"
 lazy_static = "1.4.0"
 log = "0.4.14"
 micro-timer = "0.4.0"
 regex = "1.5.5"
 env_logger = "0.9.0"
 format-bytes = "0.3.0"
 users = "0.11.0"
 which = "4.2.5"
+rayon = "1.5.1"

rust/rhg/src/commands/status.rs

@@ -1,608 +1,625 b''
 // status.rs
 //
 // Copyright 2020, Georges Racinet <[e-mail]>
 //
 // This software may be used and distributed according to the terms of the
 // GNU General Public License version 2 or any later version.
 
 use crate::error::CommandError;
 use crate::ui::Ui;
 use crate::utils::path_utils::RelativizePaths;
 use clap::{Arg, SubCommand};
 use format_bytes::format_bytes;
 use hg::config::Config;
 use hg::dirstate::has_exec_bit;
 use hg::dirstate::status::StatusPath;
 use hg::dirstate::TruncatedTimestamp;
 use hg::errors::{HgError, IoResultExt};
 use hg::lock::LockError;
 use hg::manifest::Manifest;
 use hg::matchers::{AlwaysMatcher, IntersectionMatcher};
 use hg::repo::Repo;
 use hg::utils::files::get_bytes_from_os_string;
 use hg::utils::files::get_bytes_from_path;
 use hg::utils::files::get_path_from_bytes;
 use hg::utils::hg_path::{hg_path_to_path_buf, HgPath};
 use hg::DirstateStatus;
 use hg::PatternFileWarning;
 use hg::StatusError;
 use hg::StatusOptions;
 use hg::{self, narrow, sparse};
 use log::info;
+use rayon::prelude::*;
 use std::io;
 use std::path::PathBuf;
 
 pub const HELP_TEXT: &str = "
 Show changed files in the working directory
 
 This is a pure Rust version of `hg status`.
 
 Some options might be missing, check the list below.
 ";
 
 pub fn args() -> clap::App<'static, 'static> {
     SubCommand::with_name("status")
         .alias("st")
         .about(HELP_TEXT)
         .arg(
             Arg::with_name("all")
                 .help("show status of all files")
                 .short("-A")
                 .long("--all"),
         )
         .arg(
             Arg::with_name("modified")
                 .help("show only modified files")
                 .short("-m")
                 .long("--modified"),
         )
         .arg(
             Arg::with_name("added")
                 .help("show only added files")
                 .short("-a")
                 .long("--added"),
         )
         .arg(
             Arg::with_name("removed")
                 .help("show only removed files")
                 .short("-r")
                 .long("--removed"),
         )
         .arg(
             Arg::with_name("clean")
                 .help("show only clean files")
                 .short("-c")
                 .long("--clean"),
         )
         .arg(
             Arg::with_name("deleted")
                 .help("show only deleted files")
                 .short("-d")
                 .long("--deleted"),
         )
         .arg(
             Arg::with_name("unknown")
                 .help("show only unknown (not tracked) files")
                 .short("-u")
                 .long("--unknown"),
         )
         .arg(
             Arg::with_name("ignored")
                 .help("show only ignored files")
                 .short("-i")
                 .long("--ignored"),
         )
         .arg(
             Arg::with_name("copies")
                 .help("show source of copied files (DEFAULT: ui.statuscopies)")
                 .short("-C")
                 .long("--copies"),
         )
         .arg(
             Arg::with_name("no-status")
                 .help("hide status prefix")
                 .short("-n")
                 .long("--no-status"),
         )
         .arg(
             Arg::with_name("verbose")
                 .help("enable additional output")
                 .short("-v")
                 .long("--verbose"),
         )
 }
 
 /// Pure data type allowing the caller to specify file states to display
 #[derive(Copy, Clone, Debug)]
 pub struct DisplayStates {
     pub modified: bool,
     pub added: bool,
     pub removed: bool,
     pub clean: bool,
     pub deleted: bool,
     pub unknown: bool,
     pub ignored: bool,
 }
 
 pub const DEFAULT_DISPLAY_STATES: DisplayStates = DisplayStates {
     modified: true,
     added: true,
     removed: true,
     clean: false,
     deleted: true,
     unknown: true,
     ignored: false,
 };
 
 pub const ALL_DISPLAY_STATES: DisplayStates = DisplayStates {
     modified: true,
     added: true,
     removed: true,
     clean: true,
     deleted: true,
     unknown: true,
     ignored: true,
 };
 
 impl DisplayStates {
     pub fn is_empty(&self) -> bool {
         !(self.modified
             || self.added
             || self.removed
             || self.clean
             || self.deleted
             || self.unknown
             || self.ignored)
     }
 }
 
 fn has_unfinished_merge(repo: &Repo) -> Result<bool, CommandError> {
     return Ok(repo.dirstate_parents()?.is_merge());
 }
 
 fn has_unfinished_state(repo: &Repo) -> Result<bool, CommandError> {
     // These are all the known values for the [fname] argument of
     // [addunfinished] function in [state.py]
     let known_state_files: &[&str] = &[
         "bisect.state",
         "graftstate",
         "histedit-state",
         "rebasestate",
         "shelvedstate",
         "transplant/journal",
         "updatestate",
     ];
     if has_unfinished_merge(repo)? {
         return Ok(true);
     };
     for f in known_state_files {
         if repo.hg_vfs().join(f).exists() {
             return Ok(true);
         }
     }
     return Ok(false);
 }
 
 pub fn run(invocation: &crate::CliInvocation) -> Result<(), CommandError> {
     // TODO: lift these limitations
     if invocation
         .config
         .get(b"commands", b"status.terse")
         .is_some()
     {
         return Err(CommandError::unsupported(
             "status.terse is not yet supported with rhg status",
         ));
     }
 
     let ui = invocation.ui;
     let config = invocation.config;
     let args = invocation.subcommand_args;
 
     let verbose = !args.is_present("print0")
         && (args.is_present("verbose")
             || config.get_bool(b"ui", b"verbose")?
             || config.get_bool(b"commands", b"status.verbose")?);
 
     let all = args.is_present("all");
     let display_states = if all {
         // TODO when implementing `--quiet`: it excludes clean files
         // from `--all`
         ALL_DISPLAY_STATES
     } else {
         let requested = DisplayStates {
             modified: args.is_present("modified"),
             added: args.is_present("added"),
             removed: args.is_present("removed"),
             clean: args.is_present("clean"),
             deleted: args.is_present("deleted"),
             unknown: args.is_present("unknown"),
             ignored: args.is_present("ignored"),
         };
         if requested.is_empty() {
             DEFAULT_DISPLAY_STATES
         } else {
             requested
         }
     };
     let no_status = args.is_present("no-status");
     let list_copies = all
         || args.is_present("copies")
         || config.get_bool(b"ui", b"statuscopies")?;
 
     let repo = invocation.repo?;
 
     if verbose {
         if has_unfinished_state(repo)? {
             return Err(CommandError::unsupported(
                 "verbose status output is not supported by rhg (and is needed because we're in an unfinished operation)",
             ));
         };
     }
 
     let mut dmap = repo.dirstate_map_mut()?;
 
     let options = StatusOptions {
         // we're currently supporting file systems with exec flags only
         // anyway
         check_exec: true,
         list_clean: display_states.clean,
         list_unknown: display_states.unknown,
         list_ignored: display_states.ignored,
         list_copies,
         collect_traversed_dirs: false,
     };
 
     type StatusResult<'a> =
         Result<(DirstateStatus<'a>, Vec<PatternFileWarning>), StatusError>;
 
     let after_status = |res: StatusResult| -> Result<_, CommandError> {
         let (mut ds_status, pattern_warnings) = res?;
         for warning in pattern_warnings {
             ui.write_stderr(&print_pattern_file_warning(&warning, &repo))?;
         }
 
         for (path, error) in ds_status.bad {
             let error = match error {
                 hg::BadMatch::OsError(code) => {
                     std::io::Error::from_raw_os_error(code).to_string()
                 }
                 hg::BadMatch::BadType(ty) => {
                     format!("unsupported file type (type is {})", ty)
                 }
             };
             ui.write_stderr(&format_bytes!(
                 b"{}: {}\n",
                 path.as_bytes(),
                 error.as_bytes()
             ))?
         }
         if !ds_status.unsure.is_empty() {
             info!(
                 "Files to be rechecked by retrieval from filelog: {:?}",
                 ds_status.unsure.iter().map(|s| &s.path).collect::<Vec<_>>()
             );
         }
         let mut fixup = Vec::new();
         if !ds_status.unsure.is_empty()
             && (display_states.modified || display_states.clean)
         {
             let p1 = repo.dirstate_parents()?.p1;
             let manifest = repo.manifest_for_node(p1).map_err(|e| {
                 CommandError::from((e, &*format!("{:x}", p1.short())))
             })?;
-            for to_check in ds_status.unsure {
-                if unsure_is_modified(repo, &manifest, &to_check.path)? {
+            let working_directory_vfs = repo.working_directory_vfs();
+            let store_vfs = repo.store_vfs();
+            let res: Vec<_> = ds_status
+                .unsure
+                .into_par_iter()
+                .map(|to_check| {
+                    unsure_is_modified(
+                        working_directory_vfs,
+                        store_vfs,
+                        &manifest,
+                        &to_check.path,
+                    )
+                    .map(|modified| (to_check, modified))
+                })
+                .collect::<Result<_, _>>()?;
+            for (status_path, is_modified) in res.into_iter() {
+                if is_modified {
                     if display_states.modified {
-                        ds_status.modified.push(to_check);
+                        ds_status.modified.push(status_path);
                     }
                 } else {
                     if display_states.clean {
-                        ds_status.clean.push(to_check.clone());
+                        ds_status.clean.push(status_path.clone());
                     }
-                    fixup.push(to_check.path.into_owned())
+                    fixup.push(status_path.path.into_owned())
                 }
             }
         }
         let relative_paths = config
             .get_option(b"commands", b"status.relative")?
             .unwrap_or(config.get_bool(b"ui", b"relative-paths")?);
         let output = DisplayStatusPaths {
             ui,
             no_status,
             relativize: if relative_paths {
                 Some(RelativizePaths::new(repo)?)
             } else {
                 None
             },
         };
         if display_states.modified {
             output.display(b"M ", "status.modified", ds_status.modified)?;
         }
         if display_states.added {
             output.display(b"A ", "status.added", ds_status.added)?;
         }
         if display_states.removed {
             output.display(b"R ", "status.removed", ds_status.removed)?;
         }
         if display_states.deleted {
             output.display(b"! ", "status.deleted", ds_status.deleted)?;
         }
         if display_states.unknown {
             output.display(b"? ", "status.unknown", ds_status.unknown)?;
         }
         if display_states.ignored {
             output.display(b"I ", "status.ignored", ds_status.ignored)?;
         }
         if display_states.clean {
             output.display(b"C ", "status.clean", ds_status.clean)?;
         }
 
         let dirstate_write_needed = ds_status.dirty;
         let filesystem_time_at_status_start =
             ds_status.filesystem_time_at_status_start;
 
         Ok((
             fixup,
             dirstate_write_needed,
             filesystem_time_at_status_start,
         ))
     };
     let (narrow_matcher, narrow_warnings) = narrow::matcher(repo)?;
     let (sparse_matcher, sparse_warnings) = sparse::matcher(repo)?;
     let matcher = match (repo.has_narrow(), repo.has_sparse()) {
         (true, true) => {
             Box::new(IntersectionMatcher::new(narrow_matcher, sparse_matcher))
         }
         (true, false) => narrow_matcher,
         (false, true) => sparse_matcher,
         (false, false) => Box::new(AlwaysMatcher),
     };
 
     for warning in narrow_warnings.into_iter().chain(sparse_warnings) {
         match &warning {
             sparse::SparseWarning::RootWarning { context, line } => {
                 let msg = format_bytes!(
                     b"warning: {} profile cannot use paths \"
                     starting with /, ignoring {}\n",
                     context,
                     line
                 );
                 ui.write_stderr(&msg)?;
             }
             sparse::SparseWarning::ProfileNotFound { profile, rev } => {
                 let msg = format_bytes!(
                     b"warning: sparse profile '{}' not found \"
                     in rev {} - ignoring it\n",
                     profile,
                     rev
                 );
                 ui.write_stderr(&msg)?;
             }
             sparse::SparseWarning::Pattern(e) => {
                 ui.write_stderr(&print_pattern_file_warning(e, &repo))?;
             }
         }
     }
     let (fixup, mut dirstate_write_needed, filesystem_time_at_status_start) =
         dmap.with_status(
             matcher.as_ref(),
             repo.working_directory_path().to_owned(),
             ignore_files(repo, config),
             options,
             after_status,
         )?;
 
     if (fixup.is_empty() || filesystem_time_at_status_start.is_none())
         && !dirstate_write_needed
     {
         // Nothing to update
         return Ok(());
     }
 
     // Update the dirstate on disk if we can
     let with_lock_result =
         repo.try_with_wlock_no_wait(|| -> Result<(), CommandError> {
             if let Some(mtime_boundary) = filesystem_time_at_status_start {
                 for hg_path in fixup {
                     use std::os::unix::fs::MetadataExt;
                     let fs_path = hg_path_to_path_buf(&hg_path)
                         .expect("HgPath conversion");
                     // Specifically do not reuse `fs_metadata` from
                     // `unsure_is_clean` which was needed before reading
                     // contents. Here we access metadata again after reading
                     // content, in case it changed in the meantime.
                     let fs_metadata = repo
                         .working_directory_vfs()
                         .symlink_metadata(&fs_path)?;
                     if let Some(mtime) =
                         TruncatedTimestamp::for_reliable_mtime_of(
                             &fs_metadata,
                             &mtime_boundary,
                         )
                         .when_reading_file(&fs_path)?
                     {
                         let mode = fs_metadata.mode();
                         let size = fs_metadata.len();
                         dmap.set_clean(&hg_path, mode, size as u32, mtime)?;
                         dirstate_write_needed = true
                     }
                 }
             }
             drop(dmap); // Avoid "already mutably borrowed" RefCell panics
             if dirstate_write_needed {
                 repo.write_dirstate()?
             }
             Ok(())
         });
     match with_lock_result {
         Ok(closure_result) => closure_result?,
         Err(LockError::AlreadyHeld) => {
             // Not updating the dirstate is not ideal but not critical:
             // don’t keep our caller waiting until some other Mercurial
             // process releases the lock.
         }
         Err(LockError::Other(HgError::IoError { error, .. }))
             if error.kind() == io::ErrorKind::PermissionDenied =>
         {
             // `hg status` on a read-only repository is fine
         }
         Err(LockError::Other(error)) => {
             // Report other I/O errors
             Err(error)?
         }
     }
     Ok(())
 }
 
 fn ignore_files(repo: &Repo, config: &Config) -> Vec<PathBuf> {
     let mut ignore_files = Vec::new();
     let repo_ignore = repo.working_directory_vfs().join(".hgignore");
     if repo_ignore.exists() {
         ignore_files.push(repo_ignore)
     }
     for (key, value) in config.iter_section(b"ui") {
         if key == b"ignore" || key.starts_with(b"ignore.") {
             let path = get_path_from_bytes(value);
             // TODO: expand "~/" and environment variable here, like Python
             // does with `os.path.expanduser` and `os.path.expandvars`
 
             let joined = repo.working_directory_path().join(path);
             ignore_files.push(joined);
         }
     }
     ignore_files
 }
 
 struct DisplayStatusPaths<'a> {
     ui: &'a Ui,
     no_status: bool,
     relativize: Option<RelativizePaths>,
 }
 
 impl DisplayStatusPaths<'_> {
     // Probably more elegant to use a Deref or Borrow trait rather than
     // harcode HgPathBuf, but probably not really useful at this point
     fn display(
         &self,
         status_prefix: &[u8],
         label: &'static str,
         mut paths: Vec<StatusPath<'_>>,
     ) -> Result<(), CommandError> {
         paths.sort_unstable();
         // TODO: get the stdout lock once for the whole loop
         // instead of in each write
         for StatusPath { path, copy_source } in paths {
             let relative;
             let path = if let Some(relativize) = &self.relativize {
                 relative = relativize.relativize(&path);
                 &*relative
             } else {
                 path.as_bytes()
             };
             // TODO: Add a way to use `write_bytes!` instead of `format_bytes!`
             // in order to stream to stdout instead of allocating an
             // itermediate `Vec<u8>`.
             if !self.no_status {
                 self.ui.write_stdout_labelled(status_prefix, label)?
             }
             self.ui
                 .write_stdout_labelled(&format_bytes!(b"{}\n", path), label)?;
             if let Some(source) = copy_source {
                 let label = "status.copied";
                 self.ui.write_stdout_labelled(
                     &format_bytes!(b"  {}\n", source.as_bytes()),
                     label,
                 )?
             }
         }
         Ok(())
     }
 }
 
 /// Check if a file is modified by comparing actual repo store and file system.
 ///
 /// This meant to be used for those that the dirstate cannot resolve, due
 /// to time resolution limits.
 fn unsure_is_modified(
-    repo: &Repo,
+    working_directory_vfs: hg::vfs::Vfs,
+    store_vfs: hg::vfs::Vfs,
     manifest: &Manifest,
     hg_path: &HgPath,
 ) -> Result<bool, HgError> {
-    let vfs = repo.working_directory_vfs();
+    let vfs = working_directory_vfs;
     let fs_path = hg_path_to_path_buf(hg_path).expect("HgPath conversion");
     let fs_metadata = vfs.symlink_metadata(&fs_path)?;
     let is_symlink = fs_metadata.file_type().is_symlink();
     // TODO: Also account for `FALLBACK_SYMLINK` and `FALLBACK_EXEC` from the
     // dirstate
     let fs_flags = if is_symlink {
         Some(b'l')
     } else if has_exec_bit(&fs_metadata) {
         Some(b'x')
     } else {
         None
     };
 
     let entry = manifest
         .find_by_path(hg_path)?
         .expect("ambgious file not in p1");
     if entry.flags != fs_flags {
         return Ok(true);
     }
-    let filelog = repo.filelog(hg_path)?;
+    let filelog = hg::filelog::Filelog::open_vfs(&store_vfs, hg_path)?;
     let fs_len = fs_metadata.len();
     let file_node = entry.node_id()?;
     let filelog_entry = filelog.entry_for_node(file_node).map_err(|_| {
         HgError::corrupted(format!(
             "filelog missing node {:?} from manifest",
             file_node
         ))
     })?;
     if filelog_entry.file_data_len_not_equal_to(fs_len) {
         // No need to read file contents:
         // it cannot be equal if it has a different length.
         return Ok(true);
     }
 
     let p1_filelog_data = filelog_entry.data()?;
     let p1_contents = p1_filelog_data.file_data()?;
     if p1_contents.len() as u64 != fs_len {
         // No need to read file contents:
         // it cannot be equal if it has a different length.
         return Ok(true);
     }
 
     let fs_contents = if is_symlink {
         get_bytes_from_os_string(vfs.read_link(fs_path)?.into_os_string())
     } else {
         vfs.read(fs_path)?
     };
     Ok(p1_contents != &*fs_contents)
 }
 
 fn print_pattern_file_warning(
     warning: &PatternFileWarning,
     repo: &Repo,
 ) -> Vec<u8> {
     match warning {
         PatternFileWarning::InvalidSyntax(path, syntax) => format_bytes!(
             b"{}: ignoring invalid syntax '{}'\n",
             get_bytes_from_path(path),
             &*syntax
         ),
         PatternFileWarning::NoSuchFile(path) => {
             let path = if let Ok(relative) =
                 path.strip_prefix(repo.working_directory_path())
             {
                 relative
             } else {
                 &*path
             };
             format_bytes!(
                 b"skipping unreadable pattern file '{}': \
                     No such file or directory\n",
                 get_bytes_from_path(path),
             )
         }
     }
 }