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Allow to umount VFS.

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This commit is contained in:
Natalia Portillo
2020-09-01 11:54:16 +01:00
parent b1fcf40945
commit b1dd940d00
8 changed files with 723 additions and 939 deletions
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54
RomRepoMgr.Core/Filesystem/Fuse.cs
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@@ -27,6 +27,7 @@ namespace RomRepoMgr.Core.Filesystem
readonly ConcurrentDictionary<long, Stream> _streamsCache;
long _lastHandle;
ConcurrentDictionary<string, long> _rootDirectoryCache;
string _umountToken;
public Fuse()
{
@@ -107,7 +108,27 @@ namespace RomRepoMgr.Core.Filesystem
FillRootDirectoryCache();
if(!_rootDirectoryCache.TryGetValue(pieces[0], out long romSetId))
{
if(pieces[0] == ".fuse_umount" &&
_umountToken != null)
{
stat = new Stat
{
st_mode = FilePermissions.S_IFREG | NativeConvert.FromOctalPermissionString("0444"),
st_nlink = 1,
st_ctime = NativeConvert.ToTimeT(DateTime.UtcNow),
st_mtime = NativeConvert.ToTimeT(DateTime.UtcNow),
st_blksize = 0,
st_blocks = 0,
st_ino = 0,
st_size = 0
};
return 0;
}
return Errno.ENOENT;
}
if(!_romSetsCache.TryGetValue(romSetId, out RomSet romSet))
{
@@ -472,8 +493,25 @@ namespace RomRepoMgr.Core.Filesystem
protected override Errno OnSynchronizeHandle(string file, OpenedPathInfo info, bool onlyUserData) =>
Errno.EOPNOTSUPP;
protected override Errno OnSetPathExtendedAttribute(string path, string name, byte[] value, XattrFlags flags) =>
Errno.EROFS;
protected override Errno OnSetPathExtendedAttribute(string path, string name, byte[] value, XattrFlags flags)
{
if(_umountToken == null)
return Errno.EROFS;
if(path != "/.fuse_umount")
return Errno.EROFS;
if(name != _umountToken)
return Errno.EROFS;
if(value?.Length != 0)
return Errno.EROFS;
_umountToken = null;
Stop();
return 0;
}
protected override Errno OnGetPathExtendedAttribute(string path, string name, byte[] value,
out int bytesWritten)
@@ -1155,6 +1193,18 @@ namespace RomRepoMgr.Core.Filesystem
return Errno.EOPNOTSUPP;
}
[DllImport("libc", SetLastError = true)]
static extern int setxattr(string path, string name, IntPtr value, long size, int flags);
public void Umount()
{
var rnd = new Random();
byte[] token = new byte[64];
rnd.NextBytes(token);
_umountToken = Base32.ToBase32String(token);
setxattr(Path.Combine(MountPoint, ".fuse_umount"), _umountToken, IntPtr.Zero, 0, 0);
}
sealed class CachedMachine
{
public ulong Id { get; set; }