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-rw-r--r--apt-pkg/contrib/mmap.cc105
1 files changed, 82 insertions, 23 deletions
diff --git a/apt-pkg/contrib/mmap.cc b/apt-pkg/contrib/mmap.cc
index f440f9489..69fb61fca 100644
--- a/apt-pkg/contrib/mmap.cc
+++ b/apt-pkg/contrib/mmap.cc
@@ -27,6 +27,7 @@
#include <unistd.h>
#include <fcntl.h>
#include <stdlib.h>
+#include <errno.h>
#include <cstring>
/*}}}*/
@@ -35,7 +36,7 @@
// ---------------------------------------------------------------------
/* */
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 +46,7 @@ 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)
{
}
/*}}}*/
@@ -78,7 +79,24 @@ bool MMap::Map(FileFd &Fd)
// 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.
+ 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 %lu bytes"),
+ iSize);
+ }
return true;
}
@@ -93,10 +111,19 @@ bool MMap::Close(bool DoSync)
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 +140,18 @@ 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;
}
@@ -130,8 +167,19 @@ bool MMap::Sync(unsigned long Start,unsigned long Stop)
#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");
+ {
+ if (SyncToFd != 0)
+ {
+ if (!SyncToFd->Seek(0) ||
+ !SyncToFd->Write (((char *)Base)+Start, Stop-Start))
+ return false;
+ }
+ else
+ {
+ if (msync((char *)Base+(int)(Start/PSize)*PSize,Stop - Start,MS_SYNC) < 0)
+ return _error->Errno("msync", _("Unable to synchronize mmap"));
+ }
+ }
#endif
return true;
}
@@ -177,22 +225,22 @@ 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;
int Map = MAP_PRIVATE | MAP_ANONYMOUS;
- if ((Flags & ReadOnly) != ReadOnly)
+ if ((this->Flags & ReadOnly) != ReadOnly)
Prot |= PROT_WRITE;
- if ((Flags & Public) == Public)
+ if ((this->Flags & Public) == Public)
Map = MAP_SHARED | MAP_ANONYMOUS;
// use anonymous mmap() to get the memory
@@ -249,7 +297,7 @@ 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 +314,7 @@ 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 +342,11 @@ 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 +369,7 @@ 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 +396,25 @@ 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 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 +435,7 @@ bool DynamicMMap::Grow() {
return false;
}
+ Pools =(Pool*) Base + poolOffset;
WorkSpace = newSize;
return true;
}
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