cache.c File Reference

#include "btrfs_drv.h"

Include dependency graph for cache.c:

Go to the source code of this file.

Functions
static BOOLEAN __stdcall	acquire_for_lazy_write (PVOID Context, BOOLEAN Wait)
static void __stdcall	release_from_lazy_write (PVOID Context)
static BOOLEAN __stdcall	acquire_for_read_ahead (PVOID Context, BOOLEAN Wait)
static void __stdcall	release_from_read_ahead (PVOID Context)
void	init_cache ()

Variables
CACHE_MANAGER_CALLBACKS	cache_callbacks

Function Documentation

acquire_for_lazy_write()

static BOOLEAN __stdcall acquire_for_lazy_write ( PVOID  Context, BOOLEAN  Wait  )

static

Definition at line 22 of file cache.c.

                                                                             {
    PFILE_OBJECT FileObject = Context;
    fcb* fcb = FileObject->FsContext;
 
    TRACE("(%p, %u)\n", Context, Wait);
 
    if (!ExAcquireResourceSharedLite(&fcb->Vcb->tree_lock, Wait))
        return false;
 
    if (!ExAcquireResourceExclusiveLite(fcb->Header.Resource, Wait)) {
        ExReleaseResourceLite(&fcb->Vcb->tree_lock);
        return false;
    }
 
    fcb->lazy_writer_thread = KeGetCurrentThread();
 
    IoSetTopLevelIrp((PIRP)FSRTL_CACHE_TOP_LEVEL_IRP);
 
    return true;
}

Referenced by init_cache().

acquire_for_read_ahead()

static BOOLEAN __stdcall acquire_for_read_ahead ( PVOID  Context, BOOLEAN  Wait  )

static

Definition at line 59 of file cache.c.

                                                                             {
    PFILE_OBJECT FileObject = Context;
    fcb* fcb = FileObject->FsContext;
 
    TRACE("(%p, %u)\n", Context, Wait);
 
    if (!ExAcquireResourceSharedLite(fcb->Header.Resource, Wait))
        return false;
 
    IoSetTopLevelIrp((PIRP)FSRTL_CACHE_TOP_LEVEL_IRP);
 
    return true;
}

Referenced by init_cache().

init_cache()

void init_cache

(

)

Definition at line 85 of file cache.c.

                  {
    cache_callbacks.AcquireForLazyWrite = acquire_for_lazy_write;
    cache_callbacks.ReleaseFromLazyWrite = release_from_lazy_write;
    cache_callbacks.AcquireForReadAhead = acquire_for_read_ahead;
    cache_callbacks.ReleaseFromReadAhead = release_from_read_ahead;
}

Referenced by _Function_class_().

release_from_lazy_write()

static void __stdcall release_from_lazy_write ( PVOID  Context )

static

Definition at line 43 of file cache.c.

                                                             {
    PFILE_OBJECT FileObject = Context;
    fcb* fcb = FileObject->FsContext;
 
    TRACE("(%p)\n", Context);
 
    fcb->lazy_writer_thread = NULL;
 
    ExReleaseResourceLite(fcb->Header.Resource);
 
    ExReleaseResourceLite(&fcb->Vcb->tree_lock);
 
    if (IoGetTopLevelIrp() == (PIRP)FSRTL_CACHE_TOP_LEVEL_IRP)
        IoSetTopLevelIrp(NULL);
}

Referenced by init_cache().

release_from_read_ahead()

static void __stdcall release_from_read_ahead ( PVOID  Context )

static

Definition at line 73 of file cache.c.

                                                             {
    PFILE_OBJECT FileObject = Context;
    fcb* fcb = FileObject->FsContext;
 
    TRACE("(%p)\n", Context);
 
    ExReleaseResourceLite(fcb->Header.Resource);
 
    if (IoGetTopLevelIrp() == (PIRP)FSRTL_CACHE_TOP_LEVEL_IRP)
        IoSetTopLevelIrp(NULL);
}

Referenced by init_cache().

Variable Documentation

cache_callbacks

CACHE_MANAGER_CALLBACKS cache_callbacks

Definition at line 20 of file cache.c.

Referenced by init_cache(), init_file_cache(), and mount_vol().