/*}}}*/
// Include Files /*{{{*/
#define _BSD_SOURCE
+#include <config.h>
+
#include <apt-pkg/mmap.h>
#include <apt-pkg/error.h>
-
-#include <apti18n.h>
+#include <apt-pkg/fileutl.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdlib.h>
-
+#include <errno.h>
#include <cstring>
- /*}}}*/
+
+#include <apti18n.h>
+ /*}}}*/
// 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);
// ---------------------------------------------------------------------
/* */
MMap::MMap(unsigned long Flags) : Flags(Flags), iSize(0),
- Base(0)
+ Base(0), SyncToFd(NULL)
{
}
/*}}}*/
bool MMap::Map(FileFd &Fd)
{
iSize = Fd.Size();
-
+
// Set the permissions.
int Prot = PROT_READ;
int Map = MAP_SHARED;
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 = malloc(iSize);
+ SyncToFd = new FileFd();
+ 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);
+ Base = (Flags & Fallback) ? MAP_FAILED : 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 || (Flags & Fallback))
+ {
+ // 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 = malloc(iSize);
+ SyncToFd = new FileFd();
+ 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 = calloc(iSize, 1);
+ 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;
}
/* */
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)
+ {
+ free(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;
/* This is done in syncronous mode - the docs indicate that this will
not return till all IO is complete */
bool MMap::Sync()
-{
+{
if ((Flags & UnMapped) == UnMapped)
return true;
-
-#ifdef _POSIX_SYNCHRONIZED_IO
+
if ((Flags & ReadOnly) != ReadOnly)
- if (msync((char *)Base,iSize,MS_SYNC) < 0)
- return _error->Errno("msync","Unable to write mmap");
-#endif
+ {
+ if (SyncToFd != NULL)
+ {
+ if (!SyncToFd->Seek(0) || !SyncToFd->Write(Base, iSize))
+ return false;
+ }
+ else
+ {
+#ifdef _POSIX_SYNCHRONIZED_IO
+ if (msync((char *)Base, iSize, MS_SYNC) < 0)
+ return _error->Errno("msync", _("Unable to synchronize mmap"));
+#endif
+ }
+ }
return true;
}
/*}}}*/
{
if ((Flags & UnMapped) == UnMapped)
return true;
-
-#ifdef _POSIX_SYNCHRONIZED_IO
- unsigned 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");
-#endif
+ {
+ if (SyncToFd != 0)
+ {
+ if (!SyncToFd->Seek(0) ||
+ !SyncToFd->Write (((char *)Base)+Start, Stop-Start))
+ return false;
+ }
+ else
+ {
+#ifdef _POSIX_SYNCHRONIZED_IO
+ unsigned long long const PSize = sysconf(_SC_PAGESIZE);
+ 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;
}
/*}}}*/
{
if (_error->PendingError() == true)
return;
-
- unsigned long EndOfFile = Fd->Size();
+
+ // disable Moveable if we don't grow
+ if (Grow == 0)
+ this->Flags &= ~Moveable;
+
+#ifndef __linux__
+ // kfreebsd doesn't have mremap, so we use the fallback
+ if ((this->Flags & Moveable) == Moveable)
+ this->Flags |= Fallback;
+#endif
+
+ unsigned long long EndOfFile = Fd->Size();
if (EndOfFile > WorkSpace)
WorkSpace = EndOfFile;
else if(WorkSpace > 0)
// 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);
}
#endif
// fallback to a static allocated space
- Base = new unsigned char[WorkSpace];
- memset(Base,0,WorkSpace);
+ Base = calloc(WorkSpace, 1);
iSize = 0;
}
/*}}}*/
{
if (Fd == 0)
{
+ if (validData() == false)
+ return;
#ifdef _POSIX_MAPPED_FILES
munmap(Base, WorkSpace);
#else
- delete [] (unsigned char *)Base;
+ free(Base);
#endif
return;
}
- unsigned long EndOfFile = iSize;
+ unsigned long long EndOfFile = iSize;
iSize = WorkSpace;
Close(false);
if(ftruncate(Fd->Fd(),EndOfFile) < 0)
// 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);
{
if(!Grow())
{
- _error->Error(_("Dynamic MMap ran out of room. Please increase the size "
- "of APT::Cache-Limit. Current value: %lu. (man 5 apt.conf)"), WorkSpace);
+ _error->Fatal(_("Dynamic MMap ran out of room. Please increase the size "
+ "of APT::Cache-Start. Current value: %lu. (man 5 apt.conf)"), WorkSpace);
return 0;
}
}
size in the file. */
unsigned long DynamicMMap::Allocate(unsigned long ItemSize)
{
+ if (unlikely(ItemSize == 0))
+ {
+ _error->Fatal("Can't allocate an item of size zero");
+ return 0;
+ }
+
// 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;
{
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;
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())
+ if (Base == NULL || (Result == 0 && _error->PendingError()))
return 0;
memcpy((char *)Base + Result,String,Len);
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
Base = realloc(Base, newSize);
if (Base == NULL)
return false;
+ else
+ /* Set new memory to 0 */
+ memset((char*)Base + WorkSpace, 0, newSize - WorkSpace);
}
+ Pools =(Pool*) Base + poolOffset;
WorkSpace = newSize;
return true;
}
projects / apt.git / blobdiff