X-Git-Url: https://git.saurik.com/apt.git/blobdiff_plain/b28fad8f6834fd98481b19d1cf54a2c65e25c6d1..b711c01e777977a4f9e2b78d7ab91f09f3fdf03f:/apt-pkg/contrib/mmap.cc diff --git a/apt-pkg/contrib/mmap.cc b/apt-pkg/contrib/mmap.cc index f440f9489..160718ea5 100644 --- a/apt-pkg/contrib/mmap.cc +++ b/apt-pkg/contrib/mmap.cc @@ -17,25 +17,28 @@ /*}}}*/ // Include Files /*{{{*/ #define _BSD_SOURCE +#include + #include #include - -#include +#include #include #include #include #include #include - +#include #include - /*}}}*/ + +#include + /*}}}*/ // MMap::MMap - Constructor /*{{{*/ // --------------------------------------------------------------------- /* */ MMap::MMap(FileFd &F,unsigned long Flags) : Flags(Flags), iSize(0), - Base(0) + Base(0), SyncToFd(NULL) { if ((Flags & NoImmMap) != NoImmMap) Map(F); @@ -45,7 +48,7 @@ MMap::MMap(FileFd &F,unsigned long Flags) : Flags(Flags), iSize(0), // --------------------------------------------------------------------- /* */ MMap::MMap(unsigned long Flags) : Flags(Flags), iSize(0), - Base(0) + Base(0), SyncToFd(NULL) { } /*}}}*/ @@ -63,7 +66,7 @@ MMap::~MMap() bool MMap::Map(FileFd &Fd) { iSize = Fd.Size(); - + // Set the permissions. int Prot = PROT_READ; int Map = MAP_SHARED; @@ -74,11 +77,46 @@ bool MMap::Map(FileFd &Fd) if (iSize == 0) return _error->Error(_("Can't mmap an empty file")); - + + // We can't mmap compressed fd's directly, so we need to read it completely + if (Fd.IsCompressed() == true) + { + if ((Flags & ReadOnly) != ReadOnly) + return _error->Error("Compressed file %s can only be mapped readonly", Fd.Name().c_str()); + Base = new unsigned char[iSize]; + if (Fd.Seek(0L) == false || Fd.Read(Base, iSize) == false) + return _error->Error("Compressed file %s can't be read into mmap", Fd.Name().c_str()); + return true; + } + // Map it. Base = mmap(0,iSize,Prot,Map,Fd.Fd(),0); if (Base == (void *)-1) - return _error->Errno("mmap",_("Couldn't make mmap of %lu bytes"),iSize); + { + if (errno == ENODEV || errno == EINVAL) + { + // The filesystem doesn't support this particular kind of mmap. + // So we allocate a buffer and read the whole file into it. + if ((Flags & ReadOnly) == ReadOnly) + { + // for readonly, we don't need sync, so make it simple + Base = new unsigned char[iSize]; + return Fd.Read(Base, iSize); + } + // FIXME: Writing to compressed fd's ? + int const dupped_fd = dup(Fd.Fd()); + if (dupped_fd == -1) + return _error->Errno("mmap", _("Couldn't duplicate file descriptor %i"), Fd.Fd()); + + Base = new unsigned char[iSize]; + SyncToFd = new FileFd (dupped_fd); + if (!SyncToFd->Seek(0L) || !SyncToFd->Read(Base, iSize)) + return false; + } + else + return _error->Errno("mmap",_("Couldn't make mmap of %llu bytes"), + iSize); + } return true; } @@ -88,15 +126,24 @@ bool MMap::Map(FileFd &Fd) /* */ bool MMap::Close(bool DoSync) { - if ((Flags & UnMapped) == UnMapped || Base == 0 || iSize == 0) + if ((Flags & UnMapped) == UnMapped || validData() == false || iSize == 0) return true; if (DoSync == true) Sync(); - - if (munmap((char *)Base,iSize) != 0) - _error->Warning("Unable to munmap"); - + + if (SyncToFd != NULL) + { + delete[] (char *)Base; + delete SyncToFd; + SyncToFd = NULL; + } + else + { + if (munmap((char *)Base, iSize) != 0) + _error->WarningE("mmap", _("Unable to close mmap")); + } + iSize = 0; Base = 0; return true; @@ -113,8 +160,18 @@ bool MMap::Sync() #ifdef _POSIX_SYNCHRONIZED_IO if ((Flags & ReadOnly) != ReadOnly) - if (msync((char *)Base,iSize,MS_SYNC) < 0) - return _error->Errno("msync","Unable to write mmap"); + { + if (SyncToFd != NULL) + { + if (!SyncToFd->Seek(0) || !SyncToFd->Write(Base, iSize)) + return false; + } + else + { + if (msync((char *)Base, iSize, MS_SYNC) < 0) + return _error->Errno("msync", _("Unable to synchronize mmap")); + } + } #endif return true; } @@ -128,10 +185,21 @@ bool MMap::Sync(unsigned long Start,unsigned long Stop) return true; #ifdef _POSIX_SYNCHRONIZED_IO - unsigned long PSize = sysconf(_SC_PAGESIZE); + unsigned long long PSize = sysconf(_SC_PAGESIZE); if ((Flags & ReadOnly) != ReadOnly) - if (msync((char *)Base+(int)(Start/PSize)*PSize,Stop - Start,MS_SYNC) < 0) - return _error->Errno("msync","Unable to write mmap"); + { + if (SyncToFd != 0) + { + if (!SyncToFd->Seek(0) || + !SyncToFd->Write (((char *)Base)+Start, Stop-Start)) + return false; + } + else + { + if (msync((char *)Base+(unsigned long long)(Start/PSize)*PSize,Stop - Start,MS_SYNC) < 0) + return _error->Errno("msync", _("Unable to synchronize mmap")); + } + } #endif return true; } @@ -148,7 +216,7 @@ DynamicMMap::DynamicMMap(FileFd &F,unsigned long Flags,unsigned long const &Work if (_error->PendingError() == true) return; - unsigned long EndOfFile = Fd->Size(); + unsigned long long EndOfFile = Fd->Size(); if (EndOfFile > WorkSpace) WorkSpace = EndOfFile; else if(WorkSpace > 0) @@ -177,23 +245,31 @@ DynamicMMap::DynamicMMap(unsigned long Flags,unsigned long const &WorkSpace, // disable Moveable if we don't grow if (Grow == 0) - Flags &= ~Moveable; + this->Flags &= ~Moveable; #ifndef __linux__ // kfreebsd doesn't have mremap, so we use the fallback - if ((Flags & Moveable) == Moveable) - Flags |= Fallback; + if ((this->Flags & Moveable) == Moveable) + this->Flags |= Fallback; #endif #ifdef _POSIX_MAPPED_FILES - if ((Flags & Fallback) != Fallback) { + if ((this->Flags & Fallback) != Fallback) { // Set the permissions. int Prot = PROT_READ; +#ifdef MAP_ANONYMOUS int Map = MAP_PRIVATE | MAP_ANONYMOUS; - if ((Flags & ReadOnly) != ReadOnly) +#else + int Map = MAP_PRIVATE | MAP_ANON; +#endif + if ((this->Flags & ReadOnly) != ReadOnly) Prot |= PROT_WRITE; - if ((Flags & Public) == Public) + if ((this->Flags & Public) == Public) +#ifdef MAP_ANONYMOUS Map = MAP_SHARED | MAP_ANONYMOUS; +#else + Map = MAP_SHARED | MAP_ANON; +#endif // use anonymous mmap() to get the memory Base = (unsigned char*) mmap(0, WorkSpace, Prot, Map, -1, 0); @@ -218,6 +294,8 @@ DynamicMMap::~DynamicMMap() { if (Fd == 0) { + if (validData() == false) + return; #ifdef _POSIX_MAPPED_FILES munmap(Base, WorkSpace); #else @@ -226,7 +304,7 @@ DynamicMMap::~DynamicMMap() return; } - unsigned long EndOfFile = iSize; + unsigned long long EndOfFile = iSize; iSize = WorkSpace; Close(false); if(ftruncate(Fd->Fd(),EndOfFile) < 0) @@ -236,9 +314,9 @@ DynamicMMap::~DynamicMMap() // DynamicMMap::RawAllocate - Allocate a raw chunk of unaligned space /*{{{*/ // --------------------------------------------------------------------- /* This allocates a block of memory aligned to the given size */ -unsigned long DynamicMMap::RawAllocate(unsigned long Size,unsigned long Aln) +unsigned long DynamicMMap::RawAllocate(unsigned long long Size,unsigned long Aln) { - unsigned long Result = iSize; + unsigned long long Result = iSize; if (Aln != 0) Result += Aln - (iSize%Aln); @@ -249,7 +327,7 @@ unsigned long DynamicMMap::RawAllocate(unsigned long Size,unsigned long Aln) { if(!Grow()) { - _error->Error(_("Dynamic MMap ran out of room. Please increase the size " + _error->Fatal(_("Dynamic MMap ran out of room. Please increase the size " "of APT::Cache-Limit. Current value: %lu. (man 5 apt.conf)"), WorkSpace); return 0; } @@ -266,7 +344,7 @@ unsigned long DynamicMMap::Allocate(unsigned long ItemSize) // Look for a matching pool entry Pool *I; Pool *Empty = 0; - for (I = Pools; I != Pools + PoolCount; I++) + for (I = Pools; I != Pools + PoolCount; ++I) { if (I->ItemSize == 0) Empty = I; @@ -294,7 +372,11 @@ unsigned long DynamicMMap::Allocate(unsigned long ItemSize) { const unsigned long size = 20*1024; I->Count = size/ItemSize; + Pool* oldPools = Pools; Result = RawAllocate(size,ItemSize); + if (Pools != oldPools) + I += Pools - oldPools; + // Does the allocation failed ? if (Result == 0 && _error->PendingError()) return 0; @@ -317,7 +399,7 @@ unsigned long DynamicMMap::WriteString(const char *String, if (Len == (unsigned long)-1) Len = strlen(String); - unsigned long Result = RawAllocate(Len+1,0); + unsigned long const Result = RawAllocate(Len+1,0); if (Result == 0 && _error->PendingError()) return 0; @@ -344,19 +426,25 @@ unsigned long DynamicMMap::WriteString(const char *String, the nearly impossible 4 to grow it before it finally give up: Never say never. */ bool DynamicMMap::Grow() { if (Limit != 0 && WorkSpace >= Limit) - return _error->Error(_("The size of a MMap has already reached the defined limit of %lu bytes," - "abort the try to grow the MMap."), Limit); + return _error->Error(_("Unable to increase the size of the MMap as the " + "limit of %lu bytes is already reached."), Limit); + if (GrowFactor <= 0) + return _error->Error(_("Unable to increase size of the MMap as automatic growing is disabled by user.")); - unsigned long const newSize = WorkSpace + 1024*1024; + unsigned long long const newSize = WorkSpace + GrowFactor; if(Fd != 0) { Fd->Seek(newSize - 1); char C = 0; Fd->Write(&C,sizeof(C)); } + + unsigned long const poolOffset = Pools - ((Pool*) Base); + if ((Flags & Fallback) != Fallback) { #if defined(_POSIX_MAPPED_FILES) && defined(__linux__) #ifdef MREMAP_MAYMOVE + if ((Flags & Moveable) == Moveable) Base = mremap(Base, WorkSpace, newSize, MREMAP_MAYMOVE); else @@ -377,6 +465,7 @@ bool DynamicMMap::Grow() { return false; } + Pools =(Pool*) Base + poolOffset; WorkSpace = newSize; return true; }