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[vfs2] Implement /sys/devices/system/cpu/cpuX.

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Fixes #3364

PiperOrigin-RevId: 324724614
This commit is contained in:
Ayush Ranjan
2020-08-03 18:16:54 -07:00
committed by gVisor bot
parent fe441dd251
commit ad7c9fc4c3
1 changed files with 16 additions and 8 deletions
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pkg/sentry/fsimpl/sys/sys.go
+16 -8
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@@ -30,6 +30,7 @@ import (
// Name is the default filesystem name.
const Name = "sysfs"
const defaultSysDirMode = linux.FileMode(0755)
// FilesystemType implements vfs.FilesystemType.
type FilesystemType struct{}
@@ -57,9 +58,6 @@ func (fsType FilesystemType) GetFilesystem(ctx context.Context, vfsObj *vfs.Virt
devMinor: devMinor,
}
fs.VFSFilesystem().Init(vfsObj, &fsType, fs)
k := kernel.KernelFromContext(ctx)
maxCPUCores := k.ApplicationCores()
defaultSysDirMode := linux.FileMode(0755)
root := fs.newDir(creds, defaultSysDirMode, map[string]*kernfs.Dentry{
"block": fs.newDir(creds, defaultSysDirMode, nil),
@@ -70,11 +68,7 @@ func (fsType FilesystemType) GetFilesystem(ctx context.Context, vfsObj *vfs.Virt
"dev": fs.newDir(creds, defaultSysDirMode, nil),
"devices": fs.newDir(creds, defaultSysDirMode, map[string]*kernfs.Dentry{
"system": fs.newDir(creds, defaultSysDirMode, map[string]*kernfs.Dentry{
"cpu": fs.newDir(creds, defaultSysDirMode, map[string]*kernfs.Dentry{
"online": fs.newCPUFile(creds, maxCPUCores, linux.FileMode(0444)),
"possible": fs.newCPUFile(creds, maxCPUCores, linux.FileMode(0444)),
"present": fs.newCPUFile(creds, maxCPUCores, linux.FileMode(0444)),
}),
"cpu": cpuDir(ctx, fs, creds),
}),
}),
"firmware": fs.newDir(creds, defaultSysDirMode, nil),
@@ -86,6 +80,20 @@ func (fsType FilesystemType) GetFilesystem(ctx context.Context, vfsObj *vfs.Virt
return fs.VFSFilesystem(), root.VFSDentry(), nil
}
func cpuDir(ctx context.Context, fs *filesystem, creds *auth.Credentials) *kernfs.Dentry {
k := kernel.KernelFromContext(ctx)
maxCPUCores := k.ApplicationCores()
children := map[string]*kernfs.Dentry{
"online": fs.newCPUFile(creds, maxCPUCores, linux.FileMode(0444)),
"possible": fs.newCPUFile(creds, maxCPUCores, linux.FileMode(0444)),
"present": fs.newCPUFile(creds, maxCPUCores, linux.FileMode(0444)),
}
for i := uint(0); i < maxCPUCores; i++ {
children[fmt.Sprintf("cpu%d", i)] = fs.newDir(creds, linux.FileMode(0555), nil)
}
return fs.newDir(creds, defaultSysDirMode, children)
}
// Release implements vfs.FilesystemImpl.Release.
func (fs *filesystem) Release(ctx context.Context) {
fs.Filesystem.VFSFilesystem().VirtualFilesystem().PutAnonBlockDevMinor(fs.devMinor)